From: Han-Wen Nienhuys <hanwen@xxxxxxxxxx> Signed-off-by: Han-Wen Nienhuys <hanwen@xxxxxxxxxx> --- Makefile | 4 + reftable/VERSION | 1 + reftable/dump.c | 212 ++++++ reftable/merged.c | 366 ++++++++++ reftable/merged.h | 35 + reftable/merged_test.c | 343 ++++++++++ reftable/pq.c | 115 ++++ reftable/pq.h | 32 + reftable/refname.c | 209 ++++++ reftable/refname.h | 29 + reftable/refname_test.c | 102 +++ reftable/reftable-generic.h | 48 ++ reftable/reftable-merged.h | 68 ++ reftable/reftable-stack.h | 120 ++++ reftable/reftable.c | 98 +++ reftable/stack.c | 1260 +++++++++++++++++++++++++++++++++++ reftable/stack.h | 41 ++ reftable/stack_test.c | 803 ++++++++++++++++++++++ t/helper/test-reftable.c | 3 + 19 files changed, 3889 insertions(+) create mode 100644 reftable/VERSION create mode 100644 reftable/dump.c create mode 100644 reftable/merged.c create mode 100644 reftable/merged.h create mode 100644 reftable/merged_test.c create mode 100644 reftable/pq.c create mode 100644 reftable/pq.h create mode 100644 reftable/refname.c create mode 100644 reftable/refname.h create mode 100644 reftable/refname_test.c create mode 100644 reftable/reftable-generic.h create mode 100644 reftable/reftable-merged.h create mode 100644 reftable/reftable-stack.h create mode 100644 reftable/reftable.c create mode 100644 reftable/stack.c create mode 100644 reftable/stack.h create mode 100644 reftable/stack_test.c diff --git a/Makefile b/Makefile index c913e90b643..18cc18c2153 100644 --- a/Makefile +++ b/Makefile @@ -2394,10 +2394,14 @@ REFTABLE_OBJS += reftable/error.o REFTABLE_OBJS += reftable/block.o REFTABLE_OBJS += reftable/blocksource.o REFTABLE_OBJS += reftable/iter.o +REFTABLE_OBJS += reftable/merged.o +REFTABLE_OBJS += reftable/pq.o REFTABLE_OBJS += reftable/publicbasics.o REFTABLE_OBJS += reftable/reader.o REFTABLE_OBJS += reftable/record.o +REFTABLE_OBJS += reftable/refname.o REFTABLE_OBJS += reftable/reftable.o +REFTABLE_OBJS += reftable/stack.o REFTABLE_OBJS += reftable/tree.o REFTABLE_OBJS += reftable/writer.o REFTABLE_OBJS += reftable/zlib-compat.o diff --git a/reftable/VERSION b/reftable/VERSION new file mode 100644 index 00000000000..a67c0682e1b --- /dev/null +++ b/reftable/VERSION @@ -0,0 +1 @@ +9b4a54059db9a05c270c0a0587f245bc6868d576 C: use rand() rather than cobbled together random generator. diff --git a/reftable/dump.c b/reftable/dump.c new file mode 100644 index 00000000000..00b444e8c9b --- /dev/null +++ b/reftable/dump.c @@ -0,0 +1,212 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#include <stddef.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> + +#include "reftable.h" +#include "reftable-tests.h" + +static uint32_t hash_id; + +static int dump_table(const char *tablename) +{ + struct reftable_block_source src = { 0 }; + int err = reftable_block_source_from_file(&src, tablename); + struct reftable_iterator it = { 0 }; + struct reftable_ref_record ref = { 0 }; + struct reftable_log_record log = { 0 }; + struct reftable_reader *r = NULL; + + if (err < 0) + return err; + + err = reftable_new_reader(&r, &src, tablename); + if (err < 0) + return err; + + err = reftable_reader_seek_ref(r, &it, ""); + if (err < 0) { + return err; + } + + while (1) { + err = reftable_iterator_next_ref(&it, &ref); + if (err > 0) { + break; + } + if (err < 0) { + return err; + } + reftable_ref_record_print(&ref, hash_id); + } + reftable_iterator_destroy(&it); + reftable_ref_record_clear(&ref); + + err = reftable_reader_seek_log(r, &it, ""); + if (err < 0) { + return err; + } + while (1) { + err = reftable_iterator_next_log(&it, &log); + if (err > 0) { + break; + } + if (err < 0) { + return err; + } + reftable_log_record_print(&log, hash_id); + } + reftable_iterator_destroy(&it); + reftable_log_record_clear(&log); + + reftable_reader_free(r); + return 0; +} + +static int compact_stack(const char *stackdir) +{ + struct reftable_stack *stack = NULL; + struct reftable_write_options cfg = {}; + + int err = reftable_new_stack(&stack, stackdir, cfg); + if (err < 0) + goto done; + + err = reftable_stack_compact_all(stack, NULL); + if (err < 0) + goto done; +done: + if (stack != NULL) { + reftable_stack_destroy(stack); + } + return err; +} + +static int dump_stack(const char *stackdir) +{ + struct reftable_stack *stack = NULL; + struct reftable_write_options cfg = {}; + struct reftable_iterator it = { 0 }; + struct reftable_ref_record ref = { 0 }; + struct reftable_log_record log = { 0 }; + struct reftable_merged_table *merged = NULL; + + int err = reftable_new_stack(&stack, stackdir, cfg); + if (err < 0) + return err; + + merged = reftable_stack_merged_table(stack); + + err = reftable_merged_table_seek_ref(merged, &it, ""); + if (err < 0) { + return err; + } + + while (1) { + err = reftable_iterator_next_ref(&it, &ref); + if (err > 0) { + break; + } + if (err < 0) { + return err; + } + reftable_ref_record_print(&ref, hash_id); + } + reftable_iterator_destroy(&it); + reftable_ref_record_clear(&ref); + + err = reftable_merged_table_seek_log(merged, &it, ""); + if (err < 0) { + return err; + } + while (1) { + err = reftable_iterator_next_log(&it, &log); + if (err > 0) { + break; + } + if (err < 0) { + return err; + } + reftable_log_record_print(&log, hash_id); + } + reftable_iterator_destroy(&it); + reftable_log_record_clear(&log); + + reftable_stack_destroy(stack); + return 0; +} + +static void print_help(void) +{ + printf("usage: dump [-cst] arg\n\n" + "options: \n" + " -c compact\n" + " -t dump table\n" + " -s dump stack\n" + " -h this help\n" + " -2 use SHA256\n" + "\n"); +} + +int reftable_dump_main(int argc, char *const *argv) +{ + int err = 0; + int opt; + int opt_dump_table = 0; + int opt_dump_stack = 0; + int opt_compact = 0; + const char *arg = NULL; + while ((opt = getopt(argc, argv, "2chts")) != -1) { + switch (opt) { + case '2': + hash_id = 0x73323536; + break; + case 't': + opt_dump_table = 1; + break; + case 's': + opt_dump_stack = 1; + break; + case 'c': + opt_compact = 1; + break; + case '?': + case 'h': + print_help(); + return 2; + break; + } + } + + if (argv[optind] == NULL) { + fprintf(stderr, "need argument\n"); + print_help(); + return 2; + } + + arg = argv[optind]; + + if (opt_dump_table) { + err = dump_table(arg); + } else if (opt_dump_stack) { + err = dump_stack(arg); + } else if (opt_compact) { + err = compact_stack(arg); + } + + if (err < 0) { + fprintf(stderr, "%s: %s: %s\n", argv[0], arg, + reftable_error_str(err)); + return 1; + } + return 0; +} diff --git a/reftable/merged.c b/reftable/merged.c new file mode 100644 index 00000000000..ed02625bb54 --- /dev/null +++ b/reftable/merged.c @@ -0,0 +1,366 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#include "merged.h" + +#include "constants.h" +#include "iter.h" +#include "pq.h" +#include "reader.h" +#include "record.h" +#include "reftable-merged.h" +#include "reftable-error.h" +#include "system.h" + +static int merged_iter_init(struct merged_iter *mi) +{ + int i = 0; + for (i = 0; i < mi->stack_len; i++) { + struct reftable_record rec = reftable_new_record(mi->typ); + int err = iterator_next(&mi->stack[i], &rec); + if (err < 0) { + return err; + } + + if (err > 0) { + reftable_iterator_destroy(&mi->stack[i]); + reftable_record_destroy(&rec); + } else { + struct pq_entry e = { + .rec = rec, + .index = i, + }; + merged_iter_pqueue_add(&mi->pq, e); + } + } + + return 0; +} + +static void merged_iter_close(void *p) +{ + struct merged_iter *mi = (struct merged_iter *)p; + int i = 0; + merged_iter_pqueue_release(&mi->pq); + for (i = 0; i < mi->stack_len; i++) { + reftable_iterator_destroy(&mi->stack[i]); + } + reftable_free(mi->stack); +} + +static int merged_iter_advance_nonnull_subiter(struct merged_iter *mi, + size_t idx) +{ + struct reftable_record rec = reftable_new_record(mi->typ); + struct pq_entry e = { + .rec = rec, + .index = idx, + }; + int err = iterator_next(&mi->stack[idx], &rec); + if (err < 0) + return err; + + if (err > 0) { + reftable_iterator_destroy(&mi->stack[idx]); + reftable_record_destroy(&rec); + return 0; + } + + merged_iter_pqueue_add(&mi->pq, e); + return 0; +} + +static int merged_iter_advance_subiter(struct merged_iter *mi, size_t idx) +{ + if (iterator_is_null(&mi->stack[idx])) + return 0; + return merged_iter_advance_nonnull_subiter(mi, idx); +} + +static int merged_iter_next_entry(struct merged_iter *mi, + struct reftable_record *rec) +{ + struct strbuf entry_key = STRBUF_INIT; + struct pq_entry entry = { 0 }; + int err = 0; + + if (merged_iter_pqueue_is_empty(mi->pq)) + return 1; + + entry = merged_iter_pqueue_remove(&mi->pq); + err = merged_iter_advance_subiter(mi, entry.index); + if (err < 0) + return err; + + /* + One can also use reftable as datacenter-local storage, where the ref + database is maintained in globally consistent database (eg. + CockroachDB or Spanner). In this scenario, replication delays together + with compaction may cause newer tables to contain older entries. In + such a deployment, the loop below must be changed to collect all + entries for the same key, and return new the newest one. + */ + reftable_record_key(&entry.rec, &entry_key); + while (!merged_iter_pqueue_is_empty(mi->pq)) { + struct pq_entry top = merged_iter_pqueue_top(mi->pq); + struct strbuf k = STRBUF_INIT; + int err = 0, cmp = 0; + + reftable_record_key(&top.rec, &k); + + cmp = strbuf_cmp(&k, &entry_key); + strbuf_release(&k); + + if (cmp > 0) { + break; + } + + merged_iter_pqueue_remove(&mi->pq); + err = merged_iter_advance_subiter(mi, top.index); + if (err < 0) { + return err; + } + reftable_record_destroy(&top.rec); + } + + reftable_record_copy_from(rec, &entry.rec, hash_size(mi->hash_id)); + reftable_record_destroy(&entry.rec); + strbuf_release(&entry_key); + return 0; +} + +static int merged_iter_next(struct merged_iter *mi, struct reftable_record *rec) +{ + while (1) { + int err = merged_iter_next_entry(mi, rec); + if (err == 0 && mi->suppress_deletions && + reftable_record_is_deletion(rec)) { + continue; + } + + return err; + } +} + +static int merged_iter_next_void(void *p, struct reftable_record *rec) +{ + struct merged_iter *mi = (struct merged_iter *)p; + if (merged_iter_pqueue_is_empty(mi->pq)) + return 1; + + return merged_iter_next(mi, rec); +} + +static struct reftable_iterator_vtable merged_iter_vtable = { + .next = &merged_iter_next_void, + .close = &merged_iter_close, +}; + +static void iterator_from_merged_iter(struct reftable_iterator *it, + struct merged_iter *mi) +{ + assert(it->ops == NULL); + it->iter_arg = mi; + it->ops = &merged_iter_vtable; +} + +int reftable_new_merged_table(struct reftable_merged_table **dest, + struct reftable_table *stack, int n, + uint32_t hash_id) +{ + struct reftable_merged_table *m = NULL; + uint64_t last_max = 0; + uint64_t first_min = 0; + int i = 0; + for (i = 0; i < n; i++) { + uint64_t min = reftable_table_min_update_index(&stack[i]); + uint64_t max = reftable_table_max_update_index(&stack[i]); + + if (reftable_table_hash_id(&stack[i]) != hash_id) { + return REFTABLE_FORMAT_ERROR; + } + if (i == 0 || min < first_min) { + first_min = min; + } + if (i == 0 || max > last_max) { + last_max = max; + } + } + + m = (struct reftable_merged_table *)reftable_calloc( + sizeof(struct reftable_merged_table)); + m->stack = stack; + m->stack_len = n; + m->min = first_min; + m->max = last_max; + m->hash_id = hash_id; + *dest = m; + return 0; +} + +/* clears the list of subtable, without affecting the readers themselves. */ +void merged_table_release(struct reftable_merged_table *mt) +{ + FREE_AND_NULL(mt->stack); + mt->stack_len = 0; +} + +void reftable_merged_table_free(struct reftable_merged_table *mt) +{ + if (mt == NULL) { + return; + } + merged_table_release(mt); + reftable_free(mt); +} + +uint64_t +reftable_merged_table_max_update_index(struct reftable_merged_table *mt) +{ + return mt->max; +} + +uint64_t +reftable_merged_table_min_update_index(struct reftable_merged_table *mt) +{ + return mt->min; +} + +static int reftable_table_seek_record(struct reftable_table *tab, + struct reftable_iterator *it, + struct reftable_record *rec) +{ + return tab->ops->seek_record(tab->table_arg, it, rec); +} + +static int merged_table_seek_record(struct reftable_merged_table *mt, + struct reftable_iterator *it, + struct reftable_record *rec) +{ + struct reftable_iterator *iters = reftable_calloc( + sizeof(struct reftable_iterator) * mt->stack_len); + struct merged_iter merged = { + .stack = iters, + .typ = reftable_record_type(rec), + .hash_id = mt->hash_id, + .suppress_deletions = mt->suppress_deletions, + }; + int n = 0; + int err = 0; + int i = 0; + for (i = 0; i < mt->stack_len && err == 0; i++) { + int e = reftable_table_seek_record(&mt->stack[i], &iters[n], + rec); + if (e < 0) { + err = e; + } + if (e == 0) { + n++; + } + } + if (err < 0) { + int i = 0; + for (i = 0; i < n; i++) { + reftable_iterator_destroy(&iters[i]); + } + reftable_free(iters); + return err; + } + + merged.stack_len = n; + err = merged_iter_init(&merged); + if (err < 0) { + merged_iter_close(&merged); + return err; + } else { + struct merged_iter *p = + reftable_malloc(sizeof(struct merged_iter)); + *p = merged; + iterator_from_merged_iter(it, p); + } + return 0; +} + +int reftable_merged_table_seek_ref(struct reftable_merged_table *mt, + struct reftable_iterator *it, + const char *name) +{ + struct reftable_ref_record ref = { + .refname = (char *)name, + }; + struct reftable_record rec = { NULL }; + reftable_record_from_ref(&rec, &ref); + return merged_table_seek_record(mt, it, &rec); +} + +int reftable_merged_table_seek_log_at(struct reftable_merged_table *mt, + struct reftable_iterator *it, + const char *name, uint64_t update_index) +{ + struct reftable_log_record log = { + .refname = (char *)name, + .update_index = update_index, + }; + struct reftable_record rec = { NULL }; + reftable_record_from_log(&rec, &log); + return merged_table_seek_record(mt, it, &rec); +} + +int reftable_merged_table_seek_log(struct reftable_merged_table *mt, + struct reftable_iterator *it, + const char *name) +{ + uint64_t max = ~((uint64_t)0); + return reftable_merged_table_seek_log_at(mt, it, name, max); +} + +uint32_t reftable_merged_table_hash_id(struct reftable_merged_table *mt) +{ + return mt->hash_id; +} + +static int reftable_merged_table_seek_void(void *tab, + struct reftable_iterator *it, + struct reftable_record *rec) +{ + return merged_table_seek_record((struct reftable_merged_table *)tab, it, + rec); +} + +static uint32_t reftable_merged_table_hash_id_void(void *tab) +{ + return reftable_merged_table_hash_id( + (struct reftable_merged_table *)tab); +} + +static uint64_t reftable_merged_table_min_update_index_void(void *tab) +{ + return reftable_merged_table_min_update_index( + (struct reftable_merged_table *)tab); +} + +static uint64_t reftable_merged_table_max_update_index_void(void *tab) +{ + return reftable_merged_table_max_update_index( + (struct reftable_merged_table *)tab); +} + +static struct reftable_table_vtable merged_table_vtable = { + .seek_record = reftable_merged_table_seek_void, + .hash_id = reftable_merged_table_hash_id_void, + .min_update_index = reftable_merged_table_min_update_index_void, + .max_update_index = reftable_merged_table_max_update_index_void, +}; + +void reftable_table_from_merged_table(struct reftable_table *tab, + struct reftable_merged_table *merged) +{ + assert(tab->ops == NULL); + tab->ops = &merged_table_vtable; + tab->table_arg = merged; +} diff --git a/reftable/merged.h b/reftable/merged.h new file mode 100644 index 00000000000..8c4d4d58d77 --- /dev/null +++ b/reftable/merged.h @@ -0,0 +1,35 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#ifndef MERGED_H +#define MERGED_H + +#include "pq.h" + +struct reftable_merged_table { + struct reftable_table *stack; + size_t stack_len; + uint32_t hash_id; + int suppress_deletions; + + uint64_t min; + uint64_t max; +}; + +struct merged_iter { + struct reftable_iterator *stack; + uint32_t hash_id; + size_t stack_len; + uint8_t typ; + int suppress_deletions; + struct merged_iter_pqueue pq; +}; + +void merged_table_release(struct reftable_merged_table *mt); + +#endif diff --git a/reftable/merged_test.c b/reftable/merged_test.c new file mode 100644 index 00000000000..09a70aa0fda --- /dev/null +++ b/reftable/merged_test.c @@ -0,0 +1,343 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#include "merged.h" + +#include "system.h" + +#include "basics.h" +#include "blocksource.h" +#include "constants.h" +#include "pq.h" +#include "reader.h" +#include "record.h" +#include "test_framework.h" +#include "reftable-merged.h" +#include "reftable-tests.h" +#include "reftable-generic.h" +#include "reftable-stack.h" + +static void test_pq(void) +{ + char *names[54] = { NULL }; + int N = ARRAY_SIZE(names) - 1; + + struct merged_iter_pqueue pq = { NULL }; + const char *last = NULL; + + int i = 0; + for (i = 0; i < N; i++) { + char name[100]; + snprintf(name, sizeof(name), "%02d", i); + names[i] = xstrdup(name); + } + + i = 1; + do { + struct reftable_record rec = + reftable_new_record(BLOCK_TYPE_REF); + struct pq_entry e = { 0 }; + + reftable_record_as_ref(&rec)->refname = names[i]; + e.rec = rec; + merged_iter_pqueue_add(&pq, e); + merged_iter_pqueue_check(pq); + i = (i * 7) % N; + } while (i != 1); + + while (!merged_iter_pqueue_is_empty(pq)) { + struct pq_entry e = merged_iter_pqueue_remove(&pq); + struct reftable_ref_record *ref = + reftable_record_as_ref(&e.rec); + + merged_iter_pqueue_check(pq); + + if (last != NULL) { + assert(strcmp(last, ref->refname) < 0); + } + last = ref->refname; + ref->refname = NULL; + reftable_free(ref); + } + + for (i = 0; i < N; i++) { + reftable_free(names[i]); + } + + merged_iter_pqueue_release(&pq); +} + +static void write_test_table(struct strbuf *buf, + struct reftable_ref_record refs[], int n) +{ + int min = 0xffffffff; + int max = 0; + int i = 0; + int err; + + struct reftable_write_options opts = { + .block_size = 256, + }; + struct reftable_writer *w = NULL; + for (i = 0; i < n; i++) { + uint64_t ui = refs[i].update_index; + if (ui > max) { + max = ui; + } + if (ui < min) { + min = ui; + } + } + + w = reftable_new_writer(&strbuf_add_void, buf, &opts); + reftable_writer_set_limits(w, min, max); + + for (i = 0; i < n; i++) { + uint64_t before = refs[i].update_index; + int n = reftable_writer_add_ref(w, &refs[i]); + assert(n == 0); + assert(before == refs[i].update_index); + } + + err = reftable_writer_close(w); + EXPECT_ERR(err); + + reftable_writer_free(w); +} + +static struct reftable_merged_table * +merged_table_from_records(struct reftable_ref_record **refs, + struct reftable_block_source **source, + struct reftable_reader ***readers, int *sizes, + struct strbuf *buf, int n) +{ + int i = 0; + struct reftable_merged_table *mt = NULL; + int err; + struct reftable_table *tabs = + reftable_calloc(n * sizeof(struct reftable_table)); + *readers = reftable_calloc(n * sizeof(struct reftable_reader *)); + *source = reftable_calloc(n * sizeof(**source)); + for (i = 0; i < n; i++) { + write_test_table(&buf[i], refs[i], sizes[i]); + block_source_from_strbuf(&(*source)[i], &buf[i]); + + err = reftable_new_reader(&(*readers)[i], &(*source)[i], + "name"); + EXPECT_ERR(err); + reftable_table_from_reader(&tabs[i], (*readers)[i]); + } + + err = reftable_new_merged_table(&mt, tabs, n, SHA1_ID); + EXPECT_ERR(err); + return mt; +} + +static void readers_destroy(struct reftable_reader **readers, size_t n) +{ + int i = 0; + for (; i < n; i++) + reftable_reader_free(readers[i]); + reftable_free(readers); +} + +static void test_merged_between(void) +{ + uint8_t hash1[SHA1_SIZE] = { 1, 2, 3, 0 }; + + struct reftable_ref_record r1[] = { { + .refname = "b", + .update_index = 1, + .value_type = REFTABLE_REF_VAL1, + .value.val1 = hash1, + } }; + struct reftable_ref_record r2[] = { { + .refname = "a", + .update_index = 2, + .value_type = REFTABLE_REF_DELETION, + } }; + + struct reftable_ref_record *refs[] = { r1, r2 }; + int sizes[] = { 1, 1 }; + struct strbuf bufs[2] = { STRBUF_INIT, STRBUF_INIT }; + struct reftable_block_source *bs = NULL; + struct reftable_reader **readers = NULL; + struct reftable_merged_table *mt = + merged_table_from_records(refs, &bs, &readers, sizes, bufs, 2); + int i; + struct reftable_ref_record ref = { NULL }; + struct reftable_iterator it = { NULL }; + int err = reftable_merged_table_seek_ref(mt, &it, "a"); + EXPECT_ERR(err); + + err = reftable_iterator_next_ref(&it, &ref); + EXPECT_ERR(err); + EXPECT(ref.update_index == 2); + reftable_ref_record_release(&ref); + reftable_iterator_destroy(&it); + readers_destroy(readers, 2); + reftable_merged_table_free(mt); + for (i = 0; i < ARRAY_SIZE(bufs); i++) { + strbuf_release(&bufs[i]); + } + reftable_free(bs); +} + +static void test_merged(void) +{ + uint8_t hash1[SHA1_SIZE] = { 1 }; + uint8_t hash2[SHA1_SIZE] = { 2 }; + struct reftable_ref_record r1[] = { + { + .refname = "a", + .update_index = 1, + .value_type = REFTABLE_REF_VAL1, + .value.val1 = hash1, + }, + { + .refname = "b", + .update_index = 1, + .value_type = REFTABLE_REF_VAL1, + .value.val1 = hash1, + }, + { + .refname = "c", + .update_index = 1, + .value_type = REFTABLE_REF_VAL1, + .value.val1 = hash1, + } + }; + struct reftable_ref_record r2[] = { { + .refname = "a", + .update_index = 2, + .value_type = REFTABLE_REF_DELETION, + } }; + struct reftable_ref_record r3[] = { + { + .refname = "c", + .update_index = 3, + .value_type = REFTABLE_REF_VAL1, + .value.val1 = hash2, + }, + { + .refname = "d", + .update_index = 3, + .value_type = REFTABLE_REF_VAL1, + .value.val1 = hash1, + }, + }; + + struct reftable_ref_record want[] = { + r2[0], + r1[1], + r3[0], + r3[1], + }; + + struct reftable_ref_record *refs[] = { r1, r2, r3 }; + int sizes[3] = { 3, 1, 2 }; + struct strbuf bufs[3] = { STRBUF_INIT, STRBUF_INIT, STRBUF_INIT }; + struct reftable_block_source *bs = NULL; + struct reftable_reader **readers = NULL; + struct reftable_merged_table *mt = + merged_table_from_records(refs, &bs, &readers, sizes, bufs, 3); + + struct reftable_iterator it = { NULL }; + int err = reftable_merged_table_seek_ref(mt, &it, "a"); + struct reftable_ref_record *out = NULL; + size_t len = 0; + size_t cap = 0; + int i = 0; + + EXPECT_ERR(err); + while (len < 100) { /* cap loops/recursion. */ + struct reftable_ref_record ref = { NULL }; + int err = reftable_iterator_next_ref(&it, &ref); + if (err > 0) { + break; + } + if (len == cap) { + cap = 2 * cap + 1; + out = reftable_realloc( + out, sizeof(struct reftable_ref_record) * cap); + } + out[len++] = ref; + } + reftable_iterator_destroy(&it); + + assert(ARRAY_SIZE(want) == len); + for (i = 0; i < len; i++) { + assert(reftable_ref_record_equal(&want[i], &out[i], SHA1_SIZE)); + } + for (i = 0; i < len; i++) { + reftable_ref_record_release(&out[i]); + } + reftable_free(out); + + for (i = 0; i < 3; i++) { + strbuf_release(&bufs[i]); + } + readers_destroy(readers, 3); + reftable_merged_table_free(mt); + reftable_free(bs); +} + +static void test_default_write_opts(void) +{ + struct reftable_write_options opts = { 0 }; + struct strbuf buf = STRBUF_INIT; + struct reftable_writer *w = + reftable_new_writer(&strbuf_add_void, &buf, &opts); + + struct reftable_ref_record rec = { + .refname = "master", + .update_index = 1, + }; + int err; + struct reftable_block_source source = { NULL }; + struct reftable_table *tab = reftable_calloc(sizeof(*tab) * 1); + uint32_t hash_id; + struct reftable_reader *rd = NULL; + struct reftable_merged_table *merged = NULL; + + reftable_writer_set_limits(w, 1, 1); + + err = reftable_writer_add_ref(w, &rec); + EXPECT_ERR(err); + + err = reftable_writer_close(w); + EXPECT_ERR(err); + reftable_writer_free(w); + + block_source_from_strbuf(&source, &buf); + + err = reftable_new_reader(&rd, &source, "filename"); + EXPECT_ERR(err); + + hash_id = reftable_reader_hash_id(rd); + assert(hash_id == SHA1_ID); + + reftable_table_from_reader(&tab[0], rd); + err = reftable_new_merged_table(&merged, tab, 1, SHA1_ID); + EXPECT_ERR(err); + + reftable_reader_free(rd); + reftable_merged_table_free(merged); + strbuf_release(&buf); +} + +/* XXX test refs_for(oid) */ + +int merged_test_main(int argc, const char *argv[]) +{ + RUN_TEST(test_merged_between); + RUN_TEST(test_pq); + RUN_TEST(test_merged); + RUN_TEST(test_default_write_opts); + return 0; +} diff --git a/reftable/pq.c b/reftable/pq.c new file mode 100644 index 00000000000..8918d158e2d --- /dev/null +++ b/reftable/pq.c @@ -0,0 +1,115 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#include "pq.h" + +#include "reftable-record.h" +#include "system.h" +#include "basics.h" + +static int pq_less(struct pq_entry a, struct pq_entry b) +{ + struct strbuf ak = STRBUF_INIT; + struct strbuf bk = STRBUF_INIT; + int cmp = 0; + reftable_record_key(&a.rec, &ak); + reftable_record_key(&b.rec, &bk); + + cmp = strbuf_cmp(&ak, &bk); + + strbuf_release(&ak); + strbuf_release(&bk); + + if (cmp == 0) + return a.index > b.index; + + return cmp < 0; +} + +struct pq_entry merged_iter_pqueue_top(struct merged_iter_pqueue pq) +{ + return pq.heap[0]; +} + +int merged_iter_pqueue_is_empty(struct merged_iter_pqueue pq) +{ + return pq.len == 0; +} + +void merged_iter_pqueue_check(struct merged_iter_pqueue pq) +{ + int i = 0; + for (i = 1; i < pq.len; i++) { + int parent = (i - 1) / 2; + + assert(pq_less(pq.heap[parent], pq.heap[i])); + } +} + +struct pq_entry merged_iter_pqueue_remove(struct merged_iter_pqueue *pq) +{ + int i = 0; + struct pq_entry e = pq->heap[0]; + pq->heap[0] = pq->heap[pq->len - 1]; + pq->len--; + + i = 0; + while (i < pq->len) { + int min = i; + int j = 2 * i + 1; + int k = 2 * i + 2; + if (j < pq->len && pq_less(pq->heap[j], pq->heap[i])) { + min = j; + } + if (k < pq->len && pq_less(pq->heap[k], pq->heap[min])) { + min = k; + } + + if (min == i) { + break; + } + + SWAP(pq->heap[i], pq->heap[min]); + i = min; + } + + return e; +} + +void merged_iter_pqueue_add(struct merged_iter_pqueue *pq, struct pq_entry e) +{ + int i = 0; + if (pq->len == pq->cap) { + pq->cap = 2 * pq->cap + 1; + pq->heap = reftable_realloc(pq->heap, + pq->cap * sizeof(struct pq_entry)); + } + + pq->heap[pq->len++] = e; + i = pq->len - 1; + while (i > 0) { + int j = (i - 1) / 2; + if (pq_less(pq->heap[j], pq->heap[i])) { + break; + } + + SWAP(pq->heap[j], pq->heap[i]); + + i = j; + } +} + +void merged_iter_pqueue_release(struct merged_iter_pqueue *pq) +{ + int i = 0; + for (i = 0; i < pq->len; i++) { + reftable_record_destroy(&pq->heap[i].rec); + } + FREE_AND_NULL(pq->heap); + pq->len = pq->cap = 0; +} diff --git a/reftable/pq.h b/reftable/pq.h new file mode 100644 index 00000000000..385d2fb139a --- /dev/null +++ b/reftable/pq.h @@ -0,0 +1,32 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#ifndef PQ_H +#define PQ_H + +#include "record.h" + +struct pq_entry { + int index; + struct reftable_record rec; +}; + +struct merged_iter_pqueue { + struct pq_entry *heap; + size_t len; + size_t cap; +}; + +struct pq_entry merged_iter_pqueue_top(struct merged_iter_pqueue pq); +int merged_iter_pqueue_is_empty(struct merged_iter_pqueue pq); +void merged_iter_pqueue_check(struct merged_iter_pqueue pq); +struct pq_entry merged_iter_pqueue_remove(struct merged_iter_pqueue *pq); +void merged_iter_pqueue_add(struct merged_iter_pqueue *pq, struct pq_entry e); +void merged_iter_pqueue_release(struct merged_iter_pqueue *pq); + +#endif diff --git a/reftable/refname.c b/reftable/refname.c new file mode 100644 index 00000000000..0f4eb3b292d --- /dev/null +++ b/reftable/refname.c @@ -0,0 +1,209 @@ +/* + Copyright 2020 Google LLC + + Use of this source code is governed by a BSD-style + license that can be found in the LICENSE file or at + https://developers.google.com/open-source/licenses/bsd +*/ + +#include "system.h" +#include "reftable-error.h" +#include "basics.h" +#include "refname.h" +#include "reftable-iterator.h" + +struct find_arg { + char **names; + const char *want; +}; + +static int find_name(size_t k, void *arg) +{ + struct find_arg *f_arg = (struct find_arg *)arg; + return strcmp(f_arg->names[k], f_arg->want) >= 0; +} + +static int modification_has_ref(struct modification *mod, const char *name) +{ + struct reftable_ref_record ref = { NULL }; + int err = 0; + + if (mod->add_len > 0) { + struct find_arg arg = { + .names = mod->add, + .want = name, + }; + int idx = binsearch(mod->add_len, find_name, &arg); + if (idx < mod->add_len && !strcmp(mod->add[idx], name)) { + return 0; + } + } + + if (mod->del_len > 0) { + struct find_arg arg = { + .names = mod->del, + .want = name, + }; + int idx = binsearch(mod->del_len, find_name, &arg); + if (idx < mod->del_len && !strcmp(mod->del[idx], name)) { + return 1; + } + } + + err = reftable_table_read_ref(&mod->tab, name, &ref); + reftable_ref_record_release(&ref); + return err; +} + +static void modification_release(struct modification *mod) +{ + /* don't delete the strings themselves; they're owned by ref records. + */ + FREE_AND_NULL(mod->add); + FREE_AND_NULL(mod->del); + mod->add_len = 0; + mod->del_len = 0; +} + +static int modification_has_ref_with_prefix(struct modification *mod, + const char *prefix) +{ + struct reftable_iterator it = { NULL }; + struct reftable_ref_record ref = { NULL }; + int err = 0; + + if (mod->add_len > 0) { + struct find_arg arg = { + .names = mod->add, + .want = prefix, + }; + int idx = binsearch(mod->add_len, find_name, &arg); + if (idx < mod->add_len && + !strncmp(prefix, mod->add[idx], strlen(prefix))) + goto done; + } + err = reftable_table_seek_ref(&mod->tab, &it, prefix); + if (err) + goto done; + + while (1) { + err = reftable_iterator_next_ref(&it, &ref); + if (err) + goto done; + + if (mod->del_len > 0) { + struct find_arg arg = { + .names = mod->del, + .want = ref.refname, + }; + int idx = binsearch(mod->del_len, find_name, &arg); + if (idx < mod->del_len && + !strcmp(ref.refname, mod->del[idx])) { + continue; + } + } + + if (strncmp(ref.refname, prefix, strlen(prefix))) { + err = 1; + goto done; + } + err = 0; + goto done; + } + +done: + reftable_ref_record_release(&ref); + reftable_iterator_destroy(&it); + return err; +} + +static int validate_refname(const char *name) +{ + while (1) { + char *next = strchr(name, '/'); + if (!*name) { + return REFTABLE_REFNAME_ERROR; + } + if (!next) { + return 0; + } + if (next - name == 0 || (next - name == 1 && *name == '.') || + (next - name == 2 && name[0] == '.' && name[1] == '.')) + return REFTABLE_REFNAME_ERROR; + name = next + 1; + } + return 0; +} + +int validate_ref_record_addition(struct reftable_table tab, + struct reftable_ref_record *recs, size_t sz) +{ + struct modification mod = { + .tab = tab, + .add = reftable_calloc(sizeof(char *) * sz), + .del = reftable_calloc(sizeof(char *) * sz), + }; + int i = 0; + int err = 0; + for (; i < sz; i++) { + if (reftable_ref_record_is_deletion(&recs[i])) { + mod.del[mod.del_len++] = recs[i].refname; + } else { + mod.add[mod.add_len++] = recs[i].refname; + } + } + + err = modification_validate(&mod); + modification_release(&mod); + return err; +} + +static void strbuf_trim_component(struct strbuf *sl) +{ + while (sl->len > 0) { + int is_slash = (sl->buf[sl->len - 1] == '/'); + strbuf_setlen(sl, sl->len - 1); + if (is_slash) + break; + } +} + +int modification_validate(struct modification *mod) +{ + struct strbuf slashed = STRBUF_INIT; + int err = 0; + int i = 0; + for (; i < mod->add_len; i++) { + err = validate_refname(mod->add[i]); + if (err) + goto done; + strbuf_reset(&slashed); + strbuf_addstr(&slashed, mod->add[i]); + strbuf_addstr(&slashed, "/"); + + err = modification_has_ref_with_prefix(mod, slashed.buf); + if (err == 0) { + err = REFTABLE_NAME_CONFLICT; + goto done; + } + if (err < 0) + goto done; + + strbuf_reset(&slashed); + strbuf_addstr(&slashed, mod->add[i]); + while (slashed.len) { + strbuf_trim_component(&slashed); + err = modification_has_ref(mod, slashed.buf); + if (err == 0) { + err = REFTABLE_NAME_CONFLICT; + goto done; + } + if (err < 0) + goto done; + } + } + err = 0; +done: + strbuf_release(&slashed); + return err; +} diff --git a/reftable/refname.h b/reftable/refname.h new file mode 100644 index 00000000000..a24b40fcb42 --- /dev/null +++ b/reftable/refname.h @@ -0,0 +1,29 @@ +/* + Copyright 2020 Google LLC + + Use of this source code is governed by a BSD-style + license that can be found in the LICENSE file or at + https://developers.google.com/open-source/licenses/bsd +*/ +#ifndef REFNAME_H +#define REFNAME_H + +#include "reftable-record.h" +#include "reftable-generic.h" + +struct modification { + struct reftable_table tab; + + char **add; + size_t add_len; + + char **del; + size_t del_len; +}; + +int validate_ref_record_addition(struct reftable_table tab, + struct reftable_ref_record *recs, size_t sz); + +int modification_validate(struct modification *mod); + +#endif diff --git a/reftable/refname_test.c b/reftable/refname_test.c new file mode 100644 index 00000000000..5e005d6af31 --- /dev/null +++ b/reftable/refname_test.c @@ -0,0 +1,102 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#include "basics.h" +#include "block.h" +#include "blocksource.h" +#include "constants.h" +#include "reader.h" +#include "record.h" +#include "refname.h" +#include "reftable-error.h" +#include "reftable-writer.h" +#include "system.h" + +#include "test_framework.h" +#include "reftable-tests.h" + +struct testcase { + char *add; + char *del; + int error_code; +}; + +static void test_conflict(void) +{ + struct reftable_write_options opts = { 0 }; + struct strbuf buf = STRBUF_INIT; + struct reftable_writer *w = + reftable_new_writer(&strbuf_add_void, &buf, &opts); + struct reftable_ref_record rec = { + .refname = "a/b", + .value_type = REFTABLE_REF_SYMREF, + .value.symref = "destination", /* make sure it's not a symref. + */ + .update_index = 1, + }; + int err; + int i; + struct reftable_block_source source = { NULL }; + struct reftable_reader *rd = NULL; + struct reftable_table tab = { NULL }; + struct testcase cases[] = { + { "a/b/c", NULL, REFTABLE_NAME_CONFLICT }, + { "b", NULL, 0 }, + { "a", NULL, REFTABLE_NAME_CONFLICT }, + { "a", "a/b", 0 }, + + { "p/", NULL, REFTABLE_REFNAME_ERROR }, + { "p//q", NULL, REFTABLE_REFNAME_ERROR }, + { "p/./q", NULL, REFTABLE_REFNAME_ERROR }, + { "p/../q", NULL, REFTABLE_REFNAME_ERROR }, + + { "a/b/c", "a/b", 0 }, + { NULL, "a//b", 0 }, + }; + reftable_writer_set_limits(w, 1, 1); + + err = reftable_writer_add_ref(w, &rec); + EXPECT_ERR(err); + + err = reftable_writer_close(w); + EXPECT_ERR(err); + reftable_writer_free(w); + + block_source_from_strbuf(&source, &buf); + err = reftable_new_reader(&rd, &source, "filename"); + EXPECT_ERR(err); + + reftable_table_from_reader(&tab, rd); + + for (i = 0; i < ARRAY_SIZE(cases); i++) { + struct modification mod = { + .tab = tab, + }; + + if (cases[i].add != NULL) { + mod.add = &cases[i].add; + mod.add_len = 1; + } + if (cases[i].del != NULL) { + mod.del = &cases[i].del; + mod.del_len = 1; + } + + err = modification_validate(&mod); + EXPECT(err == cases[i].error_code); + } + + reftable_reader_free(rd); + strbuf_release(&buf); +} + +int refname_test_main(int argc, const char *argv[]) +{ + RUN_TEST(test_conflict); + return 0; +} diff --git a/reftable/reftable-generic.h b/reftable/reftable-generic.h new file mode 100644 index 00000000000..77eca3b4eb0 --- /dev/null +++ b/reftable/reftable-generic.h @@ -0,0 +1,48 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#ifndef REFTABLE_GENERIC_H +#define REFTABLE_GENERIC_H + +#include "reftable-iterator.h" +#include "reftable-reader.h" +#include "reftable-merged.h" + +/* + * Provides a unified API for reading tables, either merged tables, or single + * readers. */ +struct reftable_table { + struct reftable_table_vtable *ops; + void *table_arg; +}; + +int reftable_table_seek_ref(struct reftable_table *tab, + struct reftable_iterator *it, const char *name); + +void reftable_table_from_reader(struct reftable_table *tab, + struct reftable_reader *reader); + +/* returns the hash ID from a generic reftable_table */ +uint32_t reftable_table_hash_id(struct reftable_table *tab); + +/* create a generic table from reftable_merged_table */ +void reftable_table_from_merged_table(struct reftable_table *tab, + struct reftable_merged_table *table); + +/* returns the max update_index covered by this table. */ +uint64_t reftable_table_max_update_index(struct reftable_table *tab); + +/* returns the min update_index covered by this table. */ +uint64_t reftable_table_min_update_index(struct reftable_table *tab); + +/* convenience function to read a single ref. Returns < 0 for error, 0 + for success, and 1 if ref not found. */ +int reftable_table_read_ref(struct reftable_table *tab, const char *name, + struct reftable_ref_record *ref); + +#endif diff --git a/reftable/reftable-merged.h b/reftable/reftable-merged.h new file mode 100644 index 00000000000..0e8ebe5a995 --- /dev/null +++ b/reftable/reftable-merged.h @@ -0,0 +1,68 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#ifndef REFTABLE_MERGED_H +#define REFTABLE_MERGED_H + +#include "reftable-iterator.h" + +/* + * Merged tables + * + * A ref database kept in a sequence of table files. The merged_table presents a + * unified view to reading (seeking, iterating) a sequence of immutable tables. + * + * The merged tables are on purpose kept disconnected from their actual storage + * (eg. files on disk), because it is useful to merge tables aren't files. For + * example, the per-workspace and global ref namespace can be implemented as a + * merged table of two stacks of file-backed reftables. + */ + +/* A merged table is implements seeking/iterating over a stack of tables. */ +struct reftable_merged_table; + +/* A generic reftable; see below. */ +struct reftable_table; + +/* reftable_new_merged_table creates a new merged table. It takes ownership of + the stack array. +*/ +int reftable_new_merged_table(struct reftable_merged_table **dest, + struct reftable_table *stack, int n, + uint32_t hash_id); + +/* returns an iterator positioned just before 'name' */ +int reftable_merged_table_seek_ref(struct reftable_merged_table *mt, + struct reftable_iterator *it, + const char *name); + +/* returns an iterator for log entry, at given update_index */ +int reftable_merged_table_seek_log_at(struct reftable_merged_table *mt, + struct reftable_iterator *it, + const char *name, uint64_t update_index); + +/* like reftable_merged_table_seek_log_at but look for the newest entry. */ +int reftable_merged_table_seek_log(struct reftable_merged_table *mt, + struct reftable_iterator *it, + const char *name); + +/* returns the max update_index covered by this merged table. */ +uint64_t +reftable_merged_table_max_update_index(struct reftable_merged_table *mt); + +/* returns the min update_index covered by this merged table. */ +uint64_t +reftable_merged_table_min_update_index(struct reftable_merged_table *mt); + +/* releases memory for the merged_table */ +void reftable_merged_table_free(struct reftable_merged_table *m); + +/* return the hash ID of the merged table. */ +uint32_t reftable_merged_table_hash_id(struct reftable_merged_table *m); + +#endif diff --git a/reftable/reftable-stack.h b/reftable/reftable-stack.h new file mode 100644 index 00000000000..b7060f111e8 --- /dev/null +++ b/reftable/reftable-stack.h @@ -0,0 +1,120 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#ifndef REFTABLE_STACK_H +#define REFTABLE_STACK_H + +#include "reftable-writer.h" + +/* + * The stack presents an interface to a mutable sequence of reftables. + + * A stack can be mutated by pushing a table to the top of the stack. + + * The reftable_stack automatically compacts files on disk to ensure good + * amortized performance. + * + * For windows and other platforms that cannot have open files as rename + * destinations, concurrent access from multiple processes needs the rand() + * random seed to be randomized. + */ +struct reftable_stack; + +/* open a new reftable stack. The tables along with the table list will be + * stored in 'dir'. Typically, this should be .git/reftables. + */ +int reftable_new_stack(struct reftable_stack **dest, const char *dir, + struct reftable_write_options config); + +/* returns the update_index at which a next table should be written. */ +uint64_t reftable_stack_next_update_index(struct reftable_stack *st); + +/* holds a transaction to add tables at the top of a stack. */ +struct reftable_addition; + +/* + * returns a new transaction to add reftables to the given stack. As a side + * effect, the ref database is locked. + */ +int reftable_stack_new_addition(struct reftable_addition **dest, + struct reftable_stack *st); + +/* Adds a reftable to transaction. */ +int reftable_addition_add(struct reftable_addition *add, + int (*write_table)(struct reftable_writer *wr, + void *arg), + void *arg); + +/* Commits the transaction, releasing the lock. */ +int reftable_addition_commit(struct reftable_addition *add); + +/* Release all non-committed data from the transaction, and deallocate the + * transaction. Releases the lock if held. */ +void reftable_addition_destroy(struct reftable_addition *add); + +/* add a new table to the stack. The write_table function must call + * reftable_writer_set_limits, add refs and return an error value. */ +int reftable_stack_add(struct reftable_stack *st, + int (*write_table)(struct reftable_writer *wr, + void *write_arg), + void *write_arg); + +/* returns the merged_table for seeking. This table is valid until the + * next write or reload, and should not be closed or deleted. + */ +struct reftable_merged_table * +reftable_stack_merged_table(struct reftable_stack *st); + +/* frees all resources associated with the stack. */ +void reftable_stack_destroy(struct reftable_stack *st); + +/* Reloads the stack if necessary. This is very cheap to run if the stack was up + * to date */ +int reftable_stack_reload(struct reftable_stack *st); + +/* Policy for expiring reflog entries. */ +struct reftable_log_expiry_config { + /* Drop entries older than this timestamp */ + uint64_t time; + + /* Drop older entries */ + uint64_t min_update_index; +}; + +/* compacts all reftables into a giant table. Expire reflog entries if config is + * non-NULL */ +int reftable_stack_compact_all(struct reftable_stack *st, + struct reftable_log_expiry_config *config); + +/* heuristically compact unbalanced table stack. */ +int reftable_stack_auto_compact(struct reftable_stack *st); + +/* convenience function to read a single ref. Returns < 0 for error, 0 for + * success, and 1 if ref not found. */ +int reftable_stack_read_ref(struct reftable_stack *st, const char *refname, + struct reftable_ref_record *ref); + +/* convenience function to read a single log. Returns < 0 for error, 0 for + * success, and 1 if ref not found. */ +int reftable_stack_read_log(struct reftable_stack *st, const char *refname, + struct reftable_log_record *log); + +/* statistics on past compactions. */ +struct reftable_compaction_stats { + uint64_t bytes; /* total number of bytes written */ + uint64_t entries_written; /* total number of entries written, including + failures. */ + int attempts; /* how often we tried to compact */ + int failures; /* failures happen on concurrent updates */ +}; + +/* return statistics for compaction up till now. */ +struct reftable_compaction_stats * +reftable_stack_compaction_stats(struct reftable_stack *st); + +#endif diff --git a/reftable/reftable.c b/reftable/reftable.c new file mode 100644 index 00000000000..dc4fd03d5b2 --- /dev/null +++ b/reftable/reftable.c @@ -0,0 +1,98 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#include "record.h" +#include "reader.h" +#include "reftable-iterator.h" +#include "reftable-generic.h" + +static int reftable_reader_seek_void(void *tab, struct reftable_iterator *it, + struct reftable_record *rec) +{ + return reader_seek((struct reftable_reader *)tab, it, rec); +} + +static uint32_t reftable_reader_hash_id_void(void *tab) +{ + return reftable_reader_hash_id((struct reftable_reader *)tab); +} + +static uint64_t reftable_reader_min_update_index_void(void *tab) +{ + return reftable_reader_min_update_index((struct reftable_reader *)tab); +} + +static uint64_t reftable_reader_max_update_index_void(void *tab) +{ + return reftable_reader_max_update_index((struct reftable_reader *)tab); +} + +static struct reftable_table_vtable reader_vtable = { + .seek_record = reftable_reader_seek_void, + .hash_id = reftable_reader_hash_id_void, + .min_update_index = reftable_reader_min_update_index_void, + .max_update_index = reftable_reader_max_update_index_void, +}; + +int reftable_table_seek_ref(struct reftable_table *tab, + struct reftable_iterator *it, const char *name) +{ + struct reftable_ref_record ref = { + .refname = (char *)name, + }; + struct reftable_record rec = { NULL }; + reftable_record_from_ref(&rec, &ref); + return tab->ops->seek_record(tab->table_arg, it, &rec); +} + +void reftable_table_from_reader(struct reftable_table *tab, + struct reftable_reader *reader) +{ + assert(tab->ops == NULL); + tab->ops = &reader_vtable; + tab->table_arg = reader; +} + +int reftable_table_read_ref(struct reftable_table *tab, const char *name, + struct reftable_ref_record *ref) +{ + struct reftable_iterator it = { NULL }; + int err = reftable_table_seek_ref(tab, &it, name); + if (err) + goto done; + + err = reftable_iterator_next_ref(&it, ref); + if (err) + goto done; + + if (strcmp(ref->refname, name) || + reftable_ref_record_is_deletion(ref)) { + reftable_ref_record_release(ref); + err = 1; + goto done; + } + +done: + reftable_iterator_destroy(&it); + return err; +} + +uint64_t reftable_table_max_update_index(struct reftable_table *tab) +{ + return tab->ops->max_update_index(tab->table_arg); +} + +uint64_t reftable_table_min_update_index(struct reftable_table *tab) +{ + return tab->ops->min_update_index(tab->table_arg); +} + +uint32_t reftable_table_hash_id(struct reftable_table *tab) +{ + return tab->ops->hash_id(tab->table_arg); +} diff --git a/reftable/stack.c b/reftable/stack.c new file mode 100644 index 00000000000..10608089347 --- /dev/null +++ b/reftable/stack.c @@ -0,0 +1,1260 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#include "stack.h" + +#include "system.h" +#include "merged.h" +#include "reader.h" +#include "refname.h" +#include "reftable-error.h" +#include "reftable-record.h" +#include "writer.h" + +static int stack_try_add(struct reftable_stack *st, + int (*write_table)(struct reftable_writer *wr, + void *arg), + void *arg); +static int stack_write_compact(struct reftable_stack *st, + struct reftable_writer *wr, int first, int last, + struct reftable_log_expiry_config *config); +static int stack_check_addition(struct reftable_stack *st, + const char *new_tab_name); +static void reftable_addition_close(struct reftable_addition *add); +static int reftable_stack_reload_maybe_reuse(struct reftable_stack *st, + int reuse_open); + +static int reftable_fd_write(void *arg, const void *data, size_t sz) +{ + int *fdp = (int *)arg; + return write(*fdp, data, sz); +} + +int reftable_new_stack(struct reftable_stack **dest, const char *dir, + struct reftable_write_options config) +{ + struct reftable_stack *p = + reftable_calloc(sizeof(struct reftable_stack)); + struct strbuf list_file_name = STRBUF_INIT; + int err = 0; + + if (config.hash_id == 0) { + config.hash_id = SHA1_ID; + } + + *dest = NULL; + + strbuf_reset(&list_file_name); + strbuf_addstr(&list_file_name, dir); + strbuf_addstr(&list_file_name, "/tables.list"); + + p->list_file = strbuf_detach(&list_file_name, NULL); + p->reftable_dir = xstrdup(dir); + p->config = config; + + err = reftable_stack_reload_maybe_reuse(p, 1); + if (err < 0) { + reftable_stack_destroy(p); + } else { + *dest = p; + } + return err; +} + +static int fd_read_lines(int fd, char ***namesp) +{ + off_t size = lseek(fd, 0, SEEK_END); + char *buf = NULL; + int err = 0; + if (size < 0) { + err = REFTABLE_IO_ERROR; + goto done; + } + err = lseek(fd, 0, SEEK_SET); + if (err < 0) { + err = REFTABLE_IO_ERROR; + goto done; + } + + buf = reftable_malloc(size + 1); + if (read(fd, buf, size) != size) { + err = REFTABLE_IO_ERROR; + goto done; + } + buf[size] = 0; + + parse_names(buf, size, namesp); + +done: + reftable_free(buf); + return err; +} + +int read_lines(const char *filename, char ***namesp) +{ + int fd = open(filename, O_RDONLY, 0644); + int err = 0; + if (fd < 0) { + if (errno == ENOENT) { + *namesp = reftable_calloc(sizeof(char *)); + return 0; + } + + return REFTABLE_IO_ERROR; + } + err = fd_read_lines(fd, namesp); + close(fd); + return err; +} + +struct reftable_merged_table * +reftable_stack_merged_table(struct reftable_stack *st) +{ + return st->merged; +} + +/* Close and free the stack */ +void reftable_stack_destroy(struct reftable_stack *st) +{ + if (st->merged != NULL) { + reftable_merged_table_free(st->merged); + st->merged = NULL; + } + + if (st->readers != NULL) { + int i = 0; + for (i = 0; i < st->readers_len; i++) { + reftable_reader_free(st->readers[i]); + } + st->readers_len = 0; + FREE_AND_NULL(st->readers); + } + FREE_AND_NULL(st->list_file); + FREE_AND_NULL(st->reftable_dir); + reftable_free(st); +} + +static struct reftable_reader **stack_copy_readers(struct reftable_stack *st, + int cur_len) +{ + struct reftable_reader **cur = + reftable_calloc(sizeof(struct reftable_reader *) * cur_len); + int i = 0; + for (i = 0; i < cur_len; i++) { + cur[i] = st->readers[i]; + } + return cur; +} + +static int reftable_stack_reload_once(struct reftable_stack *st, char **names, + int reuse_open) +{ + int cur_len = st->merged == NULL ? 0 : st->merged->stack_len; + struct reftable_reader **cur = stack_copy_readers(st, cur_len); + int err = 0; + int names_len = names_length(names); + struct reftable_reader **new_readers = + reftable_calloc(sizeof(struct reftable_reader *) * names_len); + struct reftable_table *new_tables = + reftable_calloc(sizeof(struct reftable_table) * names_len); + int new_readers_len = 0; + struct reftable_merged_table *new_merged = NULL; + int i; + + while (*names) { + struct reftable_reader *rd = NULL; + char *name = *names++; + + /* this is linear; we assume compaction keeps the number of + tables under control so this is not quadratic. */ + int j = 0; + for (j = 0; reuse_open && j < cur_len; j++) { + if (cur[j] != NULL && 0 == strcmp(cur[j]->name, name)) { + rd = cur[j]; + cur[j] = NULL; + break; + } + } + + if (rd == NULL) { + struct reftable_block_source src = { NULL }; + struct strbuf table_path = STRBUF_INIT; + strbuf_addstr(&table_path, st->reftable_dir); + strbuf_addstr(&table_path, "/"); + strbuf_addstr(&table_path, name); + + err = reftable_block_source_from_file(&src, + table_path.buf); + strbuf_release(&table_path); + + if (err < 0) + goto done; + + err = reftable_new_reader(&rd, &src, name); + if (err < 0) + goto done; + } + + new_readers[new_readers_len] = rd; + reftable_table_from_reader(&new_tables[new_readers_len], rd); + new_readers_len++; + } + + /* success! */ + err = reftable_new_merged_table(&new_merged, new_tables, + new_readers_len, st->config.hash_id); + if (err < 0) + goto done; + + new_tables = NULL; + st->readers_len = new_readers_len; + if (st->merged != NULL) { + merged_table_release(st->merged); + reftable_merged_table_free(st->merged); + } + if (st->readers != NULL) { + reftable_free(st->readers); + } + st->readers = new_readers; + new_readers = NULL; + new_readers_len = 0; + + new_merged->suppress_deletions = 1; + st->merged = new_merged; + for (i = 0; i < cur_len; i++) { + if (cur[i] != NULL) { + reader_close(cur[i]); + reftable_reader_free(cur[i]); + } + } + +done: + for (i = 0; i < new_readers_len; i++) { + reader_close(new_readers[i]); + reftable_reader_free(new_readers[i]); + } + reftable_free(new_readers); + reftable_free(new_tables); + reftable_free(cur); + return err; +} + +/* return negative if a before b. */ +static int tv_cmp(struct timeval *a, struct timeval *b) +{ + time_t diff = a->tv_sec - b->tv_sec; + int udiff = a->tv_usec - b->tv_usec; + + if (diff != 0) + return diff; + + return udiff; +} + +static int reftable_stack_reload_maybe_reuse(struct reftable_stack *st, + int reuse_open) +{ + struct timeval deadline = { 0 }; + int err = gettimeofday(&deadline, NULL); + int64_t delay = 0; + int tries = 0; + if (err < 0) + return err; + + deadline.tv_sec += 3; + while (1) { + char **names = NULL; + char **names_after = NULL; + struct timeval now = { 0 }; + int err = gettimeofday(&now, NULL); + int err2 = 0; + if (err < 0) { + return err; + } + + /* Only look at deadlines after the first few times. This + simplifies debugging in GDB */ + tries++; + if (tries > 3 && tv_cmp(&now, &deadline) >= 0) { + break; + } + + err = read_lines(st->list_file, &names); + if (err < 0) { + free_names(names); + return err; + } + err = reftable_stack_reload_once(st, names, reuse_open); + if (err == 0) { + free_names(names); + break; + } + if (err != REFTABLE_NOT_EXIST_ERROR) { + free_names(names); + return err; + } + + /* err == REFTABLE_NOT_EXIST_ERROR can be caused by a concurrent + writer. Check if there was one by checking if the name list + changed. + */ + err2 = read_lines(st->list_file, &names_after); + if (err2 < 0) { + free_names(names); + return err2; + } + + if (names_equal(names_after, names)) { + free_names(names); + free_names(names_after); + return err; + } + free_names(names); + free_names(names_after); + + delay = delay + (delay * rand()) / RAND_MAX + 1; + sleep_millisec(delay); + } + + return 0; +} + +/* -1 = error + 0 = up to date + 1 = changed. */ +static int stack_uptodate(struct reftable_stack *st) +{ + char **names = NULL; + int err = read_lines(st->list_file, &names); + int i = 0; + if (err < 0) + return err; + + for (i = 0; i < st->readers_len; i++) { + if (names[i] == NULL) { + err = 1; + goto done; + } + + if (strcmp(st->readers[i]->name, names[i])) { + err = 1; + goto done; + } + } + + if (names[st->merged->stack_len] != NULL) { + err = 1; + goto done; + } + +done: + free_names(names); + return err; +} + +int reftable_stack_reload(struct reftable_stack *st) +{ + int err = stack_uptodate(st); + if (err > 0) + return reftable_stack_reload_maybe_reuse(st, 1); + return err; +} + +int reftable_stack_add(struct reftable_stack *st, + int (*write)(struct reftable_writer *wr, void *arg), + void *arg) +{ + int err = stack_try_add(st, write, arg); + if (err < 0) { + if (err == REFTABLE_LOCK_ERROR) { + /* Ignore error return, we want to propagate + REFTABLE_LOCK_ERROR. + */ + reftable_stack_reload(st); + } + return err; + } + + if (!st->disable_auto_compact) + return reftable_stack_auto_compact(st); + + return 0; +} + +static void format_name(struct strbuf *dest, uint64_t min, uint64_t max) +{ + char buf[100]; + uint32_t rnd = (uint32_t)rand(); + snprintf(buf, sizeof(buf), "0x%012" PRIx64 "-0x%012" PRIx64 "-%08x", + min, max, rnd); + strbuf_reset(dest); + strbuf_addstr(dest, buf); +} + +struct reftable_addition { + int lock_file_fd; + struct strbuf lock_file_name; + struct reftable_stack *stack; + + char **new_tables; + int new_tables_len; + uint64_t next_update_index; +}; + +#define REFTABLE_ADDITION_INIT \ + { \ + .lock_file_name = STRBUF_INIT \ + } + +static int reftable_stack_init_addition(struct reftable_addition *add, + struct reftable_stack *st) +{ + int err = 0; + add->stack = st; + + strbuf_reset(&add->lock_file_name); + strbuf_addstr(&add->lock_file_name, st->list_file); + strbuf_addstr(&add->lock_file_name, ".lock"); + + add->lock_file_fd = open(add->lock_file_name.buf, + O_EXCL | O_CREAT | O_WRONLY, 0644); + if (add->lock_file_fd < 0) { + if (errno == EEXIST) { + err = REFTABLE_LOCK_ERROR; + } else { + err = REFTABLE_IO_ERROR; + } + goto done; + } + err = stack_uptodate(st); + if (err < 0) + goto done; + + if (err > 1) { + err = REFTABLE_LOCK_ERROR; + goto done; + } + + add->next_update_index = reftable_stack_next_update_index(st); +done: + if (err) { + reftable_addition_close(add); + } + return err; +} + +static void reftable_addition_close(struct reftable_addition *add) +{ + int i = 0; + struct strbuf nm = STRBUF_INIT; + for (i = 0; i < add->new_tables_len; i++) { + strbuf_reset(&nm); + strbuf_addstr(&nm, add->stack->reftable_dir); + strbuf_addstr(&nm, "/"); + strbuf_addstr(&nm, add->new_tables[i]); + unlink(nm.buf); + reftable_free(add->new_tables[i]); + add->new_tables[i] = NULL; + } + reftable_free(add->new_tables); + add->new_tables = NULL; + add->new_tables_len = 0; + + if (add->lock_file_fd > 0) { + close(add->lock_file_fd); + add->lock_file_fd = 0; + } + if (add->lock_file_name.len > 0) { + unlink(add->lock_file_name.buf); + strbuf_release(&add->lock_file_name); + } + + strbuf_release(&nm); +} + +void reftable_addition_destroy(struct reftable_addition *add) +{ + if (add == NULL) { + return; + } + reftable_addition_close(add); + reftable_free(add); +} + +int reftable_addition_commit(struct reftable_addition *add) +{ + struct strbuf table_list = STRBUF_INIT; + int i = 0; + int err = 0; + if (add->new_tables_len == 0) + goto done; + + for (i = 0; i < add->stack->merged->stack_len; i++) { + strbuf_addstr(&table_list, add->stack->readers[i]->name); + strbuf_addstr(&table_list, "\n"); + } + for (i = 0; i < add->new_tables_len; i++) { + strbuf_addstr(&table_list, add->new_tables[i]); + strbuf_addstr(&table_list, "\n"); + } + + err = write(add->lock_file_fd, table_list.buf, table_list.len); + strbuf_release(&table_list); + if (err < 0) { + err = REFTABLE_IO_ERROR; + goto done; + } + + err = close(add->lock_file_fd); + add->lock_file_fd = 0; + if (err < 0) { + err = REFTABLE_IO_ERROR; + goto done; + } + + err = rename(add->lock_file_name.buf, add->stack->list_file); + if (err < 0) { + err = REFTABLE_IO_ERROR; + goto done; + } + + /* success, no more state to clean up. */ + strbuf_release(&add->lock_file_name); + for (i = 0; i < add->new_tables_len; i++) { + reftable_free(add->new_tables[i]); + } + reftable_free(add->new_tables); + add->new_tables = NULL; + add->new_tables_len = 0; + + err = reftable_stack_reload(add->stack); +done: + reftable_addition_close(add); + return err; +} + +int reftable_stack_new_addition(struct reftable_addition **dest, + struct reftable_stack *st) +{ + int err = 0; + struct reftable_addition empty = REFTABLE_ADDITION_INIT; + *dest = reftable_calloc(sizeof(**dest)); + **dest = empty; + err = reftable_stack_init_addition(*dest, st); + if (err) { + reftable_free(*dest); + *dest = NULL; + } + return err; +} + +static int stack_try_add(struct reftable_stack *st, + int (*write_table)(struct reftable_writer *wr, + void *arg), + void *arg) +{ + struct reftable_addition add = REFTABLE_ADDITION_INIT; + int err = reftable_stack_init_addition(&add, st); + if (err < 0) + goto done; + if (err > 0) { + err = REFTABLE_LOCK_ERROR; + goto done; + } + + err = reftable_addition_add(&add, write_table, arg); + if (err < 0) + goto done; + + err = reftable_addition_commit(&add); +done: + reftable_addition_close(&add); + return err; +} + +int reftable_addition_add(struct reftable_addition *add, + int (*write_table)(struct reftable_writer *wr, + void *arg), + void *arg) +{ + struct strbuf temp_tab_file_name = STRBUF_INIT; + struct strbuf tab_file_name = STRBUF_INIT; + struct strbuf next_name = STRBUF_INIT; + struct reftable_writer *wr = NULL; + int err = 0; + int tab_fd = 0; + + strbuf_reset(&next_name); + format_name(&next_name, add->next_update_index, add->next_update_index); + + strbuf_addstr(&temp_tab_file_name, add->stack->reftable_dir); + strbuf_addstr(&temp_tab_file_name, "/"); + strbuf_addbuf(&temp_tab_file_name, &next_name); + strbuf_addstr(&temp_tab_file_name, ".temp.XXXXXX"); + + tab_fd = mkstemp(temp_tab_file_name.buf); + if (tab_fd < 0) { + err = REFTABLE_IO_ERROR; + goto done; + } + + wr = reftable_new_writer(reftable_fd_write, &tab_fd, + &add->stack->config); + err = write_table(wr, arg); + if (err < 0) + goto done; + + err = reftable_writer_close(wr); + if (err == REFTABLE_EMPTY_TABLE_ERROR) { + err = 0; + goto done; + } + if (err < 0) + goto done; + + err = close(tab_fd); + tab_fd = 0; + if (err < 0) { + err = REFTABLE_IO_ERROR; + goto done; + } + + err = stack_check_addition(add->stack, temp_tab_file_name.buf); + if (err < 0) + goto done; + + if (wr->min_update_index < add->next_update_index) { + err = REFTABLE_API_ERROR; + goto done; + } + + format_name(&next_name, wr->min_update_index, wr->max_update_index); + strbuf_addstr(&next_name, ".ref"); + + strbuf_addstr(&tab_file_name, add->stack->reftable_dir); + strbuf_addstr(&tab_file_name, "/"); + strbuf_addbuf(&tab_file_name, &next_name); + + /* + On windows, this relies on rand() picking a unique destination name. + Maybe we should do retry loop as well? + */ + err = rename(temp_tab_file_name.buf, tab_file_name.buf); + if (err < 0) { + err = REFTABLE_IO_ERROR; + goto done; + } + + add->new_tables = reftable_realloc(add->new_tables, + sizeof(*add->new_tables) * + (add->new_tables_len + 1)); + add->new_tables[add->new_tables_len] = strbuf_detach(&next_name, NULL); + add->new_tables_len++; +done: + if (tab_fd > 0) { + close(tab_fd); + tab_fd = 0; + } + if (temp_tab_file_name.len > 0) { + unlink(temp_tab_file_name.buf); + } + + strbuf_release(&temp_tab_file_name); + strbuf_release(&tab_file_name); + strbuf_release(&next_name); + reftable_writer_free(wr); + return err; +} + +uint64_t reftable_stack_next_update_index(struct reftable_stack *st) +{ + int sz = st->merged->stack_len; + if (sz > 0) + return reftable_reader_max_update_index(st->readers[sz - 1]) + + 1; + return 1; +} + +static int stack_compact_locked(struct reftable_stack *st, int first, int last, + struct strbuf *temp_tab, + struct reftable_log_expiry_config *config) +{ + struct strbuf next_name = STRBUF_INIT; + int tab_fd = -1; + struct reftable_writer *wr = NULL; + int err = 0; + + format_name(&next_name, + reftable_reader_min_update_index(st->readers[first]), + reftable_reader_max_update_index(st->readers[last])); + + strbuf_reset(temp_tab); + strbuf_addstr(temp_tab, st->reftable_dir); + strbuf_addstr(temp_tab, "/"); + strbuf_addbuf(temp_tab, &next_name); + strbuf_addstr(temp_tab, ".temp.XXXXXX"); + + tab_fd = mkstemp(temp_tab->buf); + wr = reftable_new_writer(reftable_fd_write, &tab_fd, &st->config); + + err = stack_write_compact(st, wr, first, last, config); + if (err < 0) + goto done; + err = reftable_writer_close(wr); + if (err < 0) + goto done; + + err = close(tab_fd); + tab_fd = 0; + +done: + reftable_writer_free(wr); + if (tab_fd > 0) { + close(tab_fd); + tab_fd = 0; + } + if (err != 0 && temp_tab->len > 0) { + unlink(temp_tab->buf); + strbuf_release(temp_tab); + } + strbuf_release(&next_name); + return err; +} + +static int stack_write_compact(struct reftable_stack *st, + struct reftable_writer *wr, int first, int last, + struct reftable_log_expiry_config *config) +{ + int subtabs_len = last - first + 1; + struct reftable_table *subtabs = reftable_calloc( + sizeof(struct reftable_table) * (last - first + 1)); + struct reftable_merged_table *mt = NULL; + int err = 0; + struct reftable_iterator it = { NULL }; + struct reftable_ref_record ref = { NULL }; + struct reftable_log_record log = { NULL }; + + uint64_t entries = 0; + + int i = 0, j = 0; + for (i = first, j = 0; i <= last; i++) { + struct reftable_reader *t = st->readers[i]; + reftable_table_from_reader(&subtabs[j++], t); + st->stats.bytes += t->size; + } + reftable_writer_set_limits(wr, st->readers[first]->min_update_index, + st->readers[last]->max_update_index); + + err = reftable_new_merged_table(&mt, subtabs, subtabs_len, + st->config.hash_id); + if (err < 0) { + reftable_free(subtabs); + goto done; + } + + err = reftable_merged_table_seek_ref(mt, &it, ""); + if (err < 0) + goto done; + + while (1) { + err = reftable_iterator_next_ref(&it, &ref); + if (err > 0) { + err = 0; + break; + } + if (err < 0) { + break; + } + + if (first == 0 && reftable_ref_record_is_deletion(&ref)) { + continue; + } + + err = reftable_writer_add_ref(wr, &ref); + if (err < 0) { + break; + } + entries++; + } + reftable_iterator_destroy(&it); + + err = reftable_merged_table_seek_log(mt, &it, ""); + if (err < 0) + goto done; + + while (1) { + err = reftable_iterator_next_log(&it, &log); + if (err > 0) { + err = 0; + break; + } + if (err < 0) { + break; + } + if (first == 0 && reftable_log_record_is_deletion(&log)) { + continue; + } + + if (config != NULL && config->time > 0 && + log.time < config->time) { + continue; + } + + if (config != NULL && config->min_update_index > 0 && + log.update_index < config->min_update_index) { + continue; + } + + err = reftable_writer_add_log(wr, &log); + if (err < 0) { + break; + } + entries++; + } + +done: + reftable_iterator_destroy(&it); + if (mt != NULL) { + merged_table_release(mt); + reftable_merged_table_free(mt); + } + reftable_ref_record_release(&ref); + reftable_log_record_release(&log); + st->stats.entries_written += entries; + return err; +} + +/* < 0: error. 0 == OK, > 0 attempt failed; could retry. */ +static int stack_compact_range(struct reftable_stack *st, int first, int last, + struct reftable_log_expiry_config *expiry) +{ + struct strbuf temp_tab_file_name = STRBUF_INIT; + struct strbuf new_table_name = STRBUF_INIT; + struct strbuf lock_file_name = STRBUF_INIT; + struct strbuf ref_list_contents = STRBUF_INIT; + struct strbuf new_table_path = STRBUF_INIT; + int err = 0; + int have_lock = 0; + int lock_file_fd = 0; + int compact_count = last - first + 1; + char **listp = NULL; + char **delete_on_success = + reftable_calloc(sizeof(char *) * (compact_count + 1)); + char **subtable_locks = + reftable_calloc(sizeof(char *) * (compact_count + 1)); + int i = 0; + int j = 0; + int is_empty_table = 0; + + if (first > last || (expiry == NULL && first == last)) { + err = 0; + goto done; + } + + st->stats.attempts++; + + strbuf_reset(&lock_file_name); + strbuf_addstr(&lock_file_name, st->list_file); + strbuf_addstr(&lock_file_name, ".lock"); + + lock_file_fd = + open(lock_file_name.buf, O_EXCL | O_CREAT | O_WRONLY, 0644); + if (lock_file_fd < 0) { + if (errno == EEXIST) { + err = 1; + } else { + err = REFTABLE_IO_ERROR; + } + goto done; + } + /* Don't want to write to the lock for now. */ + close(lock_file_fd); + lock_file_fd = 0; + + have_lock = 1; + err = stack_uptodate(st); + if (err != 0) + goto done; + + for (i = first, j = 0; i <= last; i++) { + struct strbuf subtab_file_name = STRBUF_INIT; + struct strbuf subtab_lock = STRBUF_INIT; + int sublock_file_fd = -1; + + strbuf_addstr(&subtab_file_name, st->reftable_dir); + strbuf_addstr(&subtab_file_name, "/"); + strbuf_addstr(&subtab_file_name, reader_name(st->readers[i])); + + strbuf_reset(&subtab_lock); + strbuf_addbuf(&subtab_lock, &subtab_file_name); + strbuf_addstr(&subtab_lock, ".lock"); + + sublock_file_fd = open(subtab_lock.buf, + O_EXCL | O_CREAT | O_WRONLY, 0644); + if (sublock_file_fd > 0) { + close(sublock_file_fd); + } else if (sublock_file_fd < 0) { + if (errno == EEXIST) { + err = 1; + } else { + err = REFTABLE_IO_ERROR; + } + } + + subtable_locks[j] = subtab_lock.buf; + delete_on_success[j] = subtab_file_name.buf; + j++; + + if (err != 0) + goto done; + } + + err = unlink(lock_file_name.buf); + if (err < 0) + goto done; + have_lock = 0; + + err = stack_compact_locked(st, first, last, &temp_tab_file_name, + expiry); + /* Compaction + tombstones can create an empty table out of non-empty + * tables. */ + is_empty_table = (err == REFTABLE_EMPTY_TABLE_ERROR); + if (is_empty_table) { + err = 0; + } + if (err < 0) + goto done; + + lock_file_fd = + open(lock_file_name.buf, O_EXCL | O_CREAT | O_WRONLY, 0644); + if (lock_file_fd < 0) { + if (errno == EEXIST) { + err = 1; + } else { + err = REFTABLE_IO_ERROR; + } + goto done; + } + have_lock = 1; + + format_name(&new_table_name, st->readers[first]->min_update_index, + st->readers[last]->max_update_index); + strbuf_addstr(&new_table_name, ".ref"); + + strbuf_reset(&new_table_path); + strbuf_addstr(&new_table_path, st->reftable_dir); + strbuf_addstr(&new_table_path, "/"); + strbuf_addbuf(&new_table_path, &new_table_name); + + if (!is_empty_table) { + /* retry? */ + err = rename(temp_tab_file_name.buf, new_table_path.buf); + if (err < 0) { + err = REFTABLE_IO_ERROR; + goto done; + } + } + + for (i = 0; i < first; i++) { + strbuf_addstr(&ref_list_contents, st->readers[i]->name); + strbuf_addstr(&ref_list_contents, "\n"); + } + if (!is_empty_table) { + strbuf_addbuf(&ref_list_contents, &new_table_name); + strbuf_addstr(&ref_list_contents, "\n"); + } + for (i = last + 1; i < st->merged->stack_len; i++) { + strbuf_addstr(&ref_list_contents, st->readers[i]->name); + strbuf_addstr(&ref_list_contents, "\n"); + } + + err = write(lock_file_fd, ref_list_contents.buf, ref_list_contents.len); + if (err < 0) { + err = REFTABLE_IO_ERROR; + unlink(new_table_path.buf); + goto done; + } + err = close(lock_file_fd); + lock_file_fd = 0; + if (err < 0) { + err = REFTABLE_IO_ERROR; + unlink(new_table_path.buf); + goto done; + } + + err = rename(lock_file_name.buf, st->list_file); + if (err < 0) { + err = REFTABLE_IO_ERROR; + unlink(new_table_path.buf); + goto done; + } + have_lock = 0; + + /* Reload the stack before deleting. On windows, we can only delete the + files after we closed them. + */ + err = reftable_stack_reload_maybe_reuse(st, first < last); + + listp = delete_on_success; + while (*listp) { + if (strcmp(*listp, new_table_path.buf)) { + unlink(*listp); + } + listp++; + } + +done: + free_names(delete_on_success); + + listp = subtable_locks; + while (*listp) { + unlink(*listp); + listp++; + } + free_names(subtable_locks); + if (lock_file_fd > 0) { + close(lock_file_fd); + lock_file_fd = 0; + } + if (have_lock) { + unlink(lock_file_name.buf); + } + strbuf_release(&new_table_name); + strbuf_release(&new_table_path); + strbuf_release(&ref_list_contents); + strbuf_release(&temp_tab_file_name); + strbuf_release(&lock_file_name); + return err; +} + +int reftable_stack_compact_all(struct reftable_stack *st, + struct reftable_log_expiry_config *config) +{ + return stack_compact_range(st, 0, st->merged->stack_len - 1, config); +} + +static int stack_compact_range_stats(struct reftable_stack *st, int first, + int last, + struct reftable_log_expiry_config *config) +{ + int err = stack_compact_range(st, first, last, config); + if (err > 0) { + st->stats.failures++; + } + return err; +} + +static int segment_size(struct segment *s) +{ + return s->end - s->start; +} + +int fastlog2(uint64_t sz) +{ + int l = 0; + if (sz == 0) + return 0; + for (; sz; sz /= 2) { + l++; + } + return l - 1; +} + +struct segment *sizes_to_segments(int *seglen, uint64_t *sizes, int n) +{ + struct segment *segs = reftable_calloc(sizeof(struct segment) * n); + int next = 0; + struct segment cur = { 0 }; + int i = 0; + + if (n == 0) { + *seglen = 0; + return segs; + } + for (i = 0; i < n; i++) { + int log = fastlog2(sizes[i]); + if (cur.log != log && cur.bytes > 0) { + struct segment fresh = { + .start = i, + }; + + segs[next++] = cur; + cur = fresh; + } + + cur.log = log; + cur.end = i + 1; + cur.bytes += sizes[i]; + } + segs[next++] = cur; + *seglen = next; + return segs; +} + +struct segment suggest_compaction_segment(uint64_t *sizes, int n) +{ + int seglen = 0; + struct segment *segs = sizes_to_segments(&seglen, sizes, n); + struct segment min_seg = { + .log = 64, + }; + int i = 0; + for (i = 0; i < seglen; i++) { + if (segment_size(&segs[i]) == 1) { + continue; + } + + if (segs[i].log < min_seg.log) { + min_seg = segs[i]; + } + } + + while (min_seg.start > 0) { + int prev = min_seg.start - 1; + if (fastlog2(min_seg.bytes) < fastlog2(sizes[prev])) { + break; + } + + min_seg.start = prev; + min_seg.bytes += sizes[prev]; + } + + reftable_free(segs); + return min_seg; +} + +static uint64_t *stack_table_sizes_for_compaction(struct reftable_stack *st) +{ + uint64_t *sizes = + reftable_calloc(sizeof(uint64_t) * st->merged->stack_len); + int version = (st->config.hash_id == SHA1_ID) ? 1 : 2; + int overhead = header_size(version) - 1; + int i = 0; + for (i = 0; i < st->merged->stack_len; i++) { + sizes[i] = st->readers[i]->size - overhead; + } + return sizes; +} + +int reftable_stack_auto_compact(struct reftable_stack *st) +{ + uint64_t *sizes = stack_table_sizes_for_compaction(st); + struct segment seg = + suggest_compaction_segment(sizes, st->merged->stack_len); + reftable_free(sizes); + if (segment_size(&seg) > 0) + return stack_compact_range_stats(st, seg.start, seg.end - 1, + NULL); + + return 0; +} + +struct reftable_compaction_stats * +reftable_stack_compaction_stats(struct reftable_stack *st) +{ + return &st->stats; +} + +int reftable_stack_read_ref(struct reftable_stack *st, const char *refname, + struct reftable_ref_record *ref) +{ + struct reftable_table tab = { NULL }; + reftable_table_from_merged_table(&tab, reftable_stack_merged_table(st)); + return reftable_table_read_ref(&tab, refname, ref); +} + +int reftable_stack_read_log(struct reftable_stack *st, const char *refname, + struct reftable_log_record *log) +{ + struct reftable_iterator it = { NULL }; + struct reftable_merged_table *mt = reftable_stack_merged_table(st); + int err = reftable_merged_table_seek_log(mt, &it, refname); + if (err) + goto done; + + err = reftable_iterator_next_log(&it, log); + if (err) + goto done; + + if (strcmp(log->refname, refname) || + reftable_log_record_is_deletion(log)) { + err = 1; + goto done; + } + +done: + if (err) { + reftable_log_record_release(log); + } + reftable_iterator_destroy(&it); + return err; +} + +static int stack_check_addition(struct reftable_stack *st, + const char *new_tab_name) +{ + int err = 0; + struct reftable_block_source src = { NULL }; + struct reftable_reader *rd = NULL; + struct reftable_table tab = { NULL }; + struct reftable_ref_record *refs = NULL; + struct reftable_iterator it = { NULL }; + int cap = 0; + int len = 0; + int i = 0; + + if (st->config.skip_name_check) + return 0; + + err = reftable_block_source_from_file(&src, new_tab_name); + if (err < 0) + goto done; + + err = reftable_new_reader(&rd, &src, new_tab_name); + if (err < 0) + goto done; + + err = reftable_reader_seek_ref(rd, &it, ""); + if (err > 0) { + err = 0; + goto done; + } + if (err < 0) + goto done; + + while (1) { + struct reftable_ref_record ref = { NULL }; + err = reftable_iterator_next_ref(&it, &ref); + if (err > 0) { + break; + } + if (err < 0) + goto done; + + if (len >= cap) { + cap = 2 * cap + 1; + refs = reftable_realloc(refs, cap * sizeof(refs[0])); + } + + refs[len++] = ref; + } + + reftable_table_from_merged_table(&tab, reftable_stack_merged_table(st)); + + err = validate_ref_record_addition(tab, refs, len); + +done: + for (i = 0; i < len; i++) { + reftable_ref_record_release(&refs[i]); + } + + free(refs); + reftable_iterator_destroy(&it); + reftable_reader_free(rd); + return err; +} diff --git a/reftable/stack.h b/reftable/stack.h new file mode 100644 index 00000000000..f57005846e5 --- /dev/null +++ b/reftable/stack.h @@ -0,0 +1,41 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#ifndef STACK_H +#define STACK_H + +#include "system.h" +#include "reftable-writer.h" +#include "reftable-stack.h" + +struct reftable_stack { + char *list_file; + char *reftable_dir; + int disable_auto_compact; + + struct reftable_write_options config; + + struct reftable_reader **readers; + size_t readers_len; + struct reftable_merged_table *merged; + struct reftable_compaction_stats stats; +}; + +int read_lines(const char *filename, char ***lines); + +struct segment { + int start, end; + int log; + uint64_t bytes; +}; + +int fastlog2(uint64_t sz); +struct segment *sizes_to_segments(int *seglen, uint64_t *sizes, int n); +struct segment suggest_compaction_segment(uint64_t *sizes, int n); + +#endif diff --git a/reftable/stack_test.c b/reftable/stack_test.c new file mode 100644 index 00000000000..f88a18e51fb --- /dev/null +++ b/reftable/stack_test.c @@ -0,0 +1,803 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#include "stack.h" + +#include "system.h" + +#include "merged.h" +#include "basics.h" +#include "constants.h" +#include "record.h" +#include "test_framework.h" +#include "reftable-tests.h" + +#include <sys/types.h> +#include <dirent.h> + +static void clear_dir(const char *dirname) +{ + struct strbuf path = STRBUF_INIT; + strbuf_addstr(&path, dirname); + remove_dir_recursively(&path, 0); + strbuf_release(&path); +} + +static char *get_tmp_template(const char *prefix) +{ + const char *tmp = getenv("TMPDIR"); + static char template[1024]; + snprintf(template, sizeof(template) - 1, "%s/%s.XXXXXX", + tmp ? tmp : "/tmp", prefix); + return template; +} + +static void test_read_file(void) +{ + char *fn = get_tmp_template(__FUNCTION__); + int fd = mkstemp(fn); + char out[1024] = "line1\n\nline2\nline3"; + int n, err; + char **names = NULL; + char *want[] = { "line1", "line2", "line3" }; + int i = 0; + + EXPECT(fd > 0); + n = write(fd, out, strlen(out)); + EXPECT(n == strlen(out)); + err = close(fd); + EXPECT(err >= 0); + + err = read_lines(fn, &names); + EXPECT_ERR(err); + + for (i = 0; names[i] != NULL; i++) { + EXPECT(0 == strcmp(want[i], names[i])); + } + free_names(names); + remove(fn); +} + +static void test_parse_names(void) +{ + char buf[] = "line\n"; + char **names = NULL; + parse_names(buf, strlen(buf), &names); + + EXPECT(NULL != names[0]); + EXPECT(0 == strcmp(names[0], "line")); + EXPECT(NULL == names[1]); + free_names(names); +} + +static void test_names_equal(void) +{ + char *a[] = { "a", "b", "c", NULL }; + char *b[] = { "a", "b", "d", NULL }; + char *c[] = { "a", "b", NULL }; + + EXPECT(names_equal(a, a)); + EXPECT(!names_equal(a, b)); + EXPECT(!names_equal(a, c)); +} + +static int write_test_ref(struct reftable_writer *wr, void *arg) +{ + struct reftable_ref_record *ref = arg; + reftable_writer_set_limits(wr, ref->update_index, ref->update_index); + return reftable_writer_add_ref(wr, ref); +} + +struct write_log_arg { + struct reftable_log_record *log; + uint64_t update_index; +}; + +static int write_test_log(struct reftable_writer *wr, void *arg) +{ + struct write_log_arg *wla = arg; + + reftable_writer_set_limits(wr, wla->update_index, wla->update_index); + return reftable_writer_add_log(wr, wla->log); +} + +static void test_reftable_stack_add_one(void) +{ + char *dir = get_tmp_template(__FUNCTION__); + struct reftable_write_options cfg = { 0 }; + struct reftable_stack *st = NULL; + int err; + struct reftable_ref_record ref = { + .refname = "HEAD", + .update_index = 1, + .value_type = REFTABLE_REF_SYMREF, + .value.symref = "master", + }; + struct reftable_ref_record dest = { NULL }; + + EXPECT(mkdtemp(dir)); + + err = reftable_new_stack(&st, dir, cfg); + EXPECT_ERR(err); + + err = reftable_stack_add(st, &write_test_ref, &ref); + EXPECT_ERR(err); + + err = reftable_stack_read_ref(st, ref.refname, &dest); + EXPECT_ERR(err); + EXPECT(0 == strcmp("master", dest.value.symref)); + + reftable_ref_record_release(&dest); + reftable_stack_destroy(st); + clear_dir(dir); +} + +static void test_reftable_stack_uptodate(void) +{ + struct reftable_write_options cfg = { 0 }; + struct reftable_stack *st1 = NULL; + struct reftable_stack *st2 = NULL; + char *dir = get_tmp_template(__FUNCTION__); + int err; + struct reftable_ref_record ref1 = { + .refname = "HEAD", + .update_index = 1, + .value_type = REFTABLE_REF_SYMREF, + .value.symref = "master", + }; + struct reftable_ref_record ref2 = { + .refname = "branch2", + .update_index = 2, + .value_type = REFTABLE_REF_SYMREF, + .value.symref = "master", + }; + + EXPECT(mkdtemp(dir)); + + /* simulate multi-process access to the same stack + by creating two stacks for the same directory. + */ + err = reftable_new_stack(&st1, dir, cfg); + EXPECT_ERR(err); + + err = reftable_new_stack(&st2, dir, cfg); + EXPECT_ERR(err); + + err = reftable_stack_add(st1, &write_test_ref, &ref1); + EXPECT_ERR(err); + + err = reftable_stack_add(st2, &write_test_ref, &ref2); + EXPECT(err == REFTABLE_LOCK_ERROR); + + err = reftable_stack_reload(st2); + EXPECT_ERR(err); + + err = reftable_stack_add(st2, &write_test_ref, &ref2); + EXPECT_ERR(err); + reftable_stack_destroy(st1); + reftable_stack_destroy(st2); + clear_dir(dir); +} + +static void test_reftable_stack_transaction_api(void) +{ + char *dir = get_tmp_template(__FUNCTION__); + struct reftable_write_options cfg = { 0 }; + struct reftable_stack *st = NULL; + int err; + struct reftable_addition *add = NULL; + + struct reftable_ref_record ref = { + .refname = "HEAD", + .update_index = 1, + .value_type = REFTABLE_REF_SYMREF, + .value.symref = "master", + }; + struct reftable_ref_record dest = { NULL }; + + EXPECT(mkdtemp(dir)); + + err = reftable_new_stack(&st, dir, cfg); + EXPECT_ERR(err); + + reftable_addition_destroy(add); + + err = reftable_stack_new_addition(&add, st); + EXPECT_ERR(err); + + err = reftable_addition_add(add, &write_test_ref, &ref); + EXPECT_ERR(err); + + err = reftable_addition_commit(add); + EXPECT_ERR(err); + + reftable_addition_destroy(add); + + err = reftable_stack_read_ref(st, ref.refname, &dest); + EXPECT_ERR(err); + EXPECT(REFTABLE_REF_SYMREF == dest.value_type); + EXPECT(0 == strcmp("master", dest.value.symref)); + + reftable_ref_record_release(&dest); + reftable_stack_destroy(st); + clear_dir(dir); +} + +static void test_reftable_stack_validate_refname(void) +{ + struct reftable_write_options cfg = { 0 }; + struct reftable_stack *st = NULL; + int err; + char *dir = get_tmp_template(__FUNCTION__); + int i; + struct reftable_ref_record ref = { + .refname = "a/b", + .update_index = 1, + .value_type = REFTABLE_REF_SYMREF, + .value.symref = "master", + }; + char *additions[] = { "a", "a/b/c" }; + + EXPECT(mkdtemp(dir)); + err = reftable_new_stack(&st, dir, cfg); + EXPECT_ERR(err); + + err = reftable_stack_add(st, &write_test_ref, &ref); + EXPECT_ERR(err); + + for (i = 0; i < ARRAY_SIZE(additions); i++) { + struct reftable_ref_record ref = { + .refname = additions[i], + .update_index = 1, + .value_type = REFTABLE_REF_SYMREF, + .value.symref = "master", + }; + + err = reftable_stack_add(st, &write_test_ref, &ref); + EXPECT(err == REFTABLE_NAME_CONFLICT); + } + + reftable_stack_destroy(st); + clear_dir(dir); +} + +static int write_error(struct reftable_writer *wr, void *arg) +{ + return *((int *)arg); +} + +static void test_reftable_stack_update_index_check(void) +{ + char *dir = get_tmp_template(__FUNCTION__); + struct reftable_write_options cfg = { 0 }; + struct reftable_stack *st = NULL; + int err; + struct reftable_ref_record ref1 = { + .refname = "name1", + .update_index = 1, + .value_type = REFTABLE_REF_SYMREF, + .value.symref = "master", + }; + struct reftable_ref_record ref2 = { + .refname = "name2", + .update_index = 1, + .value_type = REFTABLE_REF_SYMREF, + .value.symref = "master", + }; + EXPECT(mkdtemp(dir)); + + err = reftable_new_stack(&st, dir, cfg); + EXPECT_ERR(err); + + err = reftable_stack_add(st, &write_test_ref, &ref1); + EXPECT_ERR(err); + + err = reftable_stack_add(st, &write_test_ref, &ref2); + EXPECT(err == REFTABLE_API_ERROR); + reftable_stack_destroy(st); + clear_dir(dir); +} + +static void test_reftable_stack_lock_failure(void) +{ + char *dir = get_tmp_template(__FUNCTION__); + struct reftable_write_options cfg = { 0 }; + struct reftable_stack *st = NULL; + int err, i; + EXPECT(mkdtemp(dir)); + + err = reftable_new_stack(&st, dir, cfg); + EXPECT_ERR(err); + for (i = -1; i != REFTABLE_EMPTY_TABLE_ERROR; i--) { + err = reftable_stack_add(st, &write_error, &i); + EXPECT(err == i); + } + + reftable_stack_destroy(st); + clear_dir(dir); +} + +static void test_reftable_stack_add(void) +{ + int i = 0; + int err = 0; + struct reftable_write_options cfg = { + .exact_log_message = 1, + }; + struct reftable_stack *st = NULL; + char *dir = get_tmp_template(__FUNCTION__); + struct reftable_ref_record refs[2] = { { NULL } }; + struct reftable_log_record logs[2] = { { NULL } }; + int N = ARRAY_SIZE(refs); + + EXPECT(mkdtemp(dir)); + + err = reftable_new_stack(&st, dir, cfg); + EXPECT_ERR(err); + st->disable_auto_compact = 1; + + for (i = 0; i < N; i++) { + char buf[256]; + snprintf(buf, sizeof(buf), "branch%02d", i); + refs[i].refname = xstrdup(buf); + refs[i].update_index = i + 1; + refs[i].value_type = REFTABLE_REF_VAL1; + refs[i].value.val1 = reftable_malloc(SHA1_SIZE); + set_test_hash(refs[i].value.val1, i); + + logs[i].refname = xstrdup(buf); + logs[i].update_index = N + i + 1; + logs[i].new_hash = reftable_malloc(SHA1_SIZE); + logs[i].email = xstrdup("identity@invalid"); + set_test_hash(logs[i].new_hash, i); + } + + for (i = 0; i < N; i++) { + int err = reftable_stack_add(st, &write_test_ref, &refs[i]); + EXPECT_ERR(err); + } + + for (i = 0; i < N; i++) { + struct write_log_arg arg = { + .log = &logs[i], + .update_index = reftable_stack_next_update_index(st), + }; + int err = reftable_stack_add(st, &write_test_log, &arg); + EXPECT_ERR(err); + } + + err = reftable_stack_compact_all(st, NULL); + EXPECT_ERR(err); + + for (i = 0; i < N; i++) { + struct reftable_ref_record dest = { NULL }; + + int err = reftable_stack_read_ref(st, refs[i].refname, &dest); + EXPECT_ERR(err); + EXPECT(reftable_ref_record_equal(&dest, refs + i, SHA1_SIZE)); + reftable_ref_record_release(&dest); + } + + for (i = 0; i < N; i++) { + struct reftable_log_record dest = { NULL }; + int err = reftable_stack_read_log(st, refs[i].refname, &dest); + EXPECT_ERR(err); + EXPECT(reftable_log_record_equal(&dest, logs + i, SHA1_SIZE)); + reftable_log_record_release(&dest); + } + + /* cleanup */ + reftable_stack_destroy(st); + for (i = 0; i < N; i++) { + reftable_ref_record_release(&refs[i]); + reftable_log_record_release(&logs[i]); + } + clear_dir(dir); +} + +static void test_reftable_stack_log_normalize(void) +{ + int err = 0; + struct reftable_write_options cfg = { + 0, + }; + struct reftable_stack *st = NULL; + char *dir = get_tmp_template(__FUNCTION__); + + uint8_t h1[SHA1_SIZE] = { 0x01 }, h2[SHA1_SIZE] = { 0x02 }; + + struct reftable_log_record input = { + .refname = "branch", + .update_index = 1, + .new_hash = h1, + .old_hash = h2, + }; + struct reftable_log_record dest = { + .update_index = 0, + }; + struct write_log_arg arg = { + .log = &input, + .update_index = 1, + }; + + EXPECT(mkdtemp(dir)); + err = reftable_new_stack(&st, dir, cfg); + EXPECT_ERR(err); + + input.message = "one\ntwo"; + err = reftable_stack_add(st, &write_test_log, &arg); + EXPECT(err == REFTABLE_API_ERROR); + + input.message = "one"; + err = reftable_stack_add(st, &write_test_log, &arg); + EXPECT_ERR(err); + + err = reftable_stack_read_log(st, input.refname, &dest); + EXPECT_ERR(err); + EXPECT(0 == strcmp(dest.message, "one\n")); + + input.message = "two\n"; + arg.update_index = 2; + err = reftable_stack_add(st, &write_test_log, &arg); + EXPECT_ERR(err); + err = reftable_stack_read_log(st, input.refname, &dest); + EXPECT_ERR(err); + EXPECT(0 == strcmp(dest.message, "two\n")); + + /* cleanup */ + reftable_stack_destroy(st); + reftable_log_record_release(&dest); + clear_dir(dir); +} + +static void test_reftable_stack_tombstone(void) +{ + int i = 0; + char *dir = get_tmp_template(__FUNCTION__); + struct reftable_write_options cfg = { 0 }; + struct reftable_stack *st = NULL; + int err; + struct reftable_ref_record refs[2] = { { NULL } }; + struct reftable_log_record logs[2] = { { NULL } }; + int N = ARRAY_SIZE(refs); + struct reftable_ref_record dest = { NULL }; + struct reftable_log_record log_dest = { NULL }; + + EXPECT(mkdtemp(dir)); + + err = reftable_new_stack(&st, dir, cfg); + EXPECT_ERR(err); + + for (i = 0; i < N; i++) { + const char *buf = "branch"; + refs[i].refname = xstrdup(buf); + refs[i].update_index = i + 1; + if (i % 2 == 0) { + refs[i].value_type = REFTABLE_REF_VAL1; + refs[i].value.val1 = reftable_malloc(SHA1_SIZE); + set_test_hash(refs[i].value.val1, i); + } + logs[i].refname = xstrdup(buf); + /* update_index is part of the key. */ + logs[i].update_index = 42; + if (i % 2 == 0) { + logs[i].new_hash = reftable_malloc(SHA1_SIZE); + set_test_hash(logs[i].new_hash, i); + logs[i].email = xstrdup("identity@invalid"); + } + } + for (i = 0; i < N; i++) { + int err = reftable_stack_add(st, &write_test_ref, &refs[i]); + EXPECT_ERR(err); + } + for (i = 0; i < N; i++) { + struct write_log_arg arg = { + .log = &logs[i], + .update_index = reftable_stack_next_update_index(st), + }; + int err = reftable_stack_add(st, &write_test_log, &arg); + EXPECT_ERR(err); + } + + err = reftable_stack_read_ref(st, "branch", &dest); + EXPECT(err == 1); + reftable_ref_record_release(&dest); + + err = reftable_stack_read_log(st, "branch", &log_dest); + EXPECT(err == 1); + reftable_log_record_release(&log_dest); + + err = reftable_stack_compact_all(st, NULL); + EXPECT_ERR(err); + + err = reftable_stack_read_ref(st, "branch", &dest); + EXPECT(err == 1); + + err = reftable_stack_read_log(st, "branch", &log_dest); + EXPECT(err == 1); + reftable_ref_record_release(&dest); + reftable_log_record_release(&log_dest); + + /* cleanup */ + reftable_stack_destroy(st); + for (i = 0; i < N; i++) { + reftable_ref_record_release(&refs[i]); + reftable_log_record_release(&logs[i]); + } + clear_dir(dir); +} + +static void test_reftable_stack_hash_id(void) +{ + char *dir = get_tmp_template(__FUNCTION__); + struct reftable_write_options cfg = { 0 }; + struct reftable_stack *st = NULL; + int err; + + struct reftable_ref_record ref = { + .refname = "master", + .value_type = REFTABLE_REF_SYMREF, + .value.symref = "target", + .update_index = 1, + }; + struct reftable_write_options cfg32 = { .hash_id = SHA256_ID }; + struct reftable_stack *st32 = NULL; + struct reftable_write_options cfg_default = { 0 }; + struct reftable_stack *st_default = NULL; + struct reftable_ref_record dest = { NULL }; + + EXPECT(mkdtemp(dir)); + err = reftable_new_stack(&st, dir, cfg); + EXPECT_ERR(err); + + err = reftable_stack_add(st, &write_test_ref, &ref); + EXPECT_ERR(err); + + /* can't read it with the wrong hash ID. */ + err = reftable_new_stack(&st32, dir, cfg32); + EXPECT(err == REFTABLE_FORMAT_ERROR); + + /* check that we can read it back with default config too. */ + err = reftable_new_stack(&st_default, dir, cfg_default); + EXPECT_ERR(err); + + err = reftable_stack_read_ref(st_default, "master", &dest); + EXPECT_ERR(err); + + EXPECT(reftable_ref_record_equal(&ref, &dest, SHA1_SIZE)); + reftable_ref_record_release(&dest); + reftable_stack_destroy(st); + reftable_stack_destroy(st_default); + clear_dir(dir); +} + +static void test_log2(void) +{ + EXPECT(1 == fastlog2(3)); + EXPECT(2 == fastlog2(4)); + EXPECT(2 == fastlog2(5)); +} + +static void test_sizes_to_segments(void) +{ + uint64_t sizes[] = { 2, 3, 4, 5, 7, 9 }; + /* .................0 1 2 3 4 5 */ + + int seglen = 0; + struct segment *segs = + sizes_to_segments(&seglen, sizes, ARRAY_SIZE(sizes)); + EXPECT(segs[2].log == 3); + EXPECT(segs[2].start == 5); + EXPECT(segs[2].end == 6); + + EXPECT(segs[1].log == 2); + EXPECT(segs[1].start == 2); + EXPECT(segs[1].end == 5); + reftable_free(segs); +} + +static void test_sizes_to_segments_empty(void) +{ + int seglen = 0; + struct segment *segs = sizes_to_segments(&seglen, NULL, 0); + EXPECT(seglen == 0); + reftable_free(segs); +} + +static void test_sizes_to_segments_all_equal(void) +{ + uint64_t sizes[] = { 5, 5 }; + + int seglen = 0; + struct segment *segs = + sizes_to_segments(&seglen, sizes, ARRAY_SIZE(sizes)); + EXPECT(seglen == 1); + EXPECT(segs[0].start == 0); + EXPECT(segs[0].end == 2); + reftable_free(segs); +} + +static void test_suggest_compaction_segment(void) +{ + uint64_t sizes[] = { 128, 64, 17, 16, 9, 9, 9, 16, 16 }; + /* .................0 1 2 3 4 5 6 */ + struct segment min = + suggest_compaction_segment(sizes, ARRAY_SIZE(sizes)); + EXPECT(min.start == 2); + EXPECT(min.end == 7); +} + +static void test_suggest_compaction_segment_nothing(void) +{ + uint64_t sizes[] = { 64, 32, 16, 8, 4, 2 }; + struct segment result = + suggest_compaction_segment(sizes, ARRAY_SIZE(sizes)); + EXPECT(result.start == result.end); +} + +static void test_reflog_expire(void) +{ + char *dir = get_tmp_template(__FUNCTION__); + struct reftable_write_options cfg = { 0 }; + struct reftable_stack *st = NULL; + struct reftable_log_record logs[20] = { { NULL } }; + int N = ARRAY_SIZE(logs) - 1; + int i = 0; + int err; + struct reftable_log_expiry_config expiry = { + .time = 10, + }; + struct reftable_log_record log = { NULL }; + + EXPECT(mkdtemp(dir)); + + err = reftable_new_stack(&st, dir, cfg); + EXPECT_ERR(err); + + for (i = 1; i <= N; i++) { + char buf[256]; + snprintf(buf, sizeof(buf), "branch%02d", i); + + logs[i].refname = xstrdup(buf); + logs[i].update_index = i; + logs[i].time = i; + logs[i].new_hash = reftable_malloc(SHA1_SIZE); + logs[i].email = xstrdup("identity@invalid"); + set_test_hash(logs[i].new_hash, i); + } + + for (i = 1; i <= N; i++) { + struct write_log_arg arg = { + .log = &logs[i], + .update_index = reftable_stack_next_update_index(st), + }; + int err = reftable_stack_add(st, &write_test_log, &arg); + EXPECT_ERR(err); + } + + err = reftable_stack_compact_all(st, NULL); + EXPECT_ERR(err); + + err = reftable_stack_compact_all(st, &expiry); + EXPECT_ERR(err); + + err = reftable_stack_read_log(st, logs[9].refname, &log); + EXPECT(err == 1); + + err = reftable_stack_read_log(st, logs[11].refname, &log); + EXPECT_ERR(err); + + expiry.min_update_index = 15; + err = reftable_stack_compact_all(st, &expiry); + EXPECT_ERR(err); + + err = reftable_stack_read_log(st, logs[14].refname, &log); + EXPECT(err == 1); + + err = reftable_stack_read_log(st, logs[16].refname, &log); + EXPECT_ERR(err); + + /* cleanup */ + reftable_stack_destroy(st); + for (i = 0; i <= N; i++) { + reftable_log_record_release(&logs[i]); + } + clear_dir(dir); + reftable_log_record_release(&log); +} + +static int write_nothing(struct reftable_writer *wr, void *arg) +{ + reftable_writer_set_limits(wr, 1, 1); + return 0; +} + +static void test_empty_add(void) +{ + struct reftable_write_options cfg = { 0 }; + struct reftable_stack *st = NULL; + int err; + char *dir = get_tmp_template(__FUNCTION__); + struct reftable_stack *st2 = NULL; + + EXPECT(mkdtemp(dir)); + + err = reftable_new_stack(&st, dir, cfg); + EXPECT_ERR(err); + + err = reftable_stack_add(st, &write_nothing, NULL); + EXPECT_ERR(err); + + err = reftable_new_stack(&st2, dir, cfg); + EXPECT_ERR(err); + clear_dir(dir); + reftable_stack_destroy(st); + reftable_stack_destroy(st2); +} + +static void test_reftable_stack_auto_compaction(void) +{ + struct reftable_write_options cfg = { 0 }; + struct reftable_stack *st = NULL; + char *dir = get_tmp_template(__FUNCTION__); + int err, i; + int N = 100; + EXPECT(mkdtemp(dir)); + + err = reftable_new_stack(&st, dir, cfg); + EXPECT_ERR(err); + + for (i = 0; i < N; i++) { + char name[100]; + struct reftable_ref_record ref = { + .refname = name, + .update_index = reftable_stack_next_update_index(st), + .value_type = REFTABLE_REF_SYMREF, + .value.symref = "master", + }; + snprintf(name, sizeof(name), "branch%04d", i); + + err = reftable_stack_add(st, &write_test_ref, &ref); + EXPECT_ERR(err); + + EXPECT(i < 3 || st->merged->stack_len < 2 * fastlog2(i)); + } + + EXPECT(reftable_stack_compaction_stats(st)->entries_written < + (uint64_t)(N * fastlog2(N))); + + reftable_stack_destroy(st); + clear_dir(dir); +} + +int stack_test_main(int argc, const char *argv[]) +{ + RUN_TEST(test_reftable_stack_uptodate); + RUN_TEST(test_reftable_stack_transaction_api); + RUN_TEST(test_reftable_stack_hash_id); + RUN_TEST(test_sizes_to_segments_all_equal); + RUN_TEST(test_reftable_stack_auto_compaction); + RUN_TEST(test_reftable_stack_validate_refname); + RUN_TEST(test_reftable_stack_update_index_check); + RUN_TEST(test_reftable_stack_lock_failure); + RUN_TEST(test_reftable_stack_log_normalize); + RUN_TEST(test_reftable_stack_tombstone); + RUN_TEST(test_reftable_stack_add_one); + RUN_TEST(test_empty_add); + RUN_TEST(test_reflog_expire); + RUN_TEST(test_suggest_compaction_segment); + RUN_TEST(test_suggest_compaction_segment_nothing); + RUN_TEST(test_sizes_to_segments); + RUN_TEST(test_sizes_to_segments_empty); + RUN_TEST(test_log2); + RUN_TEST(test_parse_names); + RUN_TEST(test_read_file); + RUN_TEST(test_names_equal); + RUN_TEST(test_reftable_stack_add); + return 0; +} diff --git a/t/helper/test-reftable.c b/t/helper/test-reftable.c index fdf92586737..3b702f4855e 100644 --- a/t/helper/test-reftable.c +++ b/t/helper/test-reftable.c @@ -5,8 +5,11 @@ int cmd__reftable(int argc, const char **argv) { basics_test_main(argc, argv); block_test_main(argc, argv); + merged_test_main(argc, argv); record_test_main(argc, argv); + refname_test_main(argc, argv); reftable_test_main(argc, argv); + stack_test_main(argc, argv); tree_test_main(argc, argv); return 0; } -- gitgitgadget
