The upload-pack requests are mostly plain text and they compress
rather well. Deflating them with Content-Encoding: gzip can easily
drop the size of the request by 50%, reducing the amount of data
to transfer as we negotiate the common commits.
Signed-off-by: Shawn O. Pearce <spearce@xxxxxxxxxxx>
CC: Daniel Barkalow <barkalow@xxxxxxxxxxxx>
---
remote-curl.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 50 insertions(+), 0 deletions(-)
diff --git a/remote-curl.c b/remote-curl.c
index eb71ffd..b6420fe 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -289,6 +289,7 @@ struct rpc_state {
int in;
int out;
struct strbuf result;
+ unsigned gzip_request : 1;
};
static size_t rpc_out(void *ptr, size_t eltsize,
@@ -327,6 +328,8 @@ static int post_rpc(struct rpc_state *rpc)
struct active_request_slot *slot;
struct slot_results results;
struct curl_slist *headers = NULL;
+ int use_gzip = rpc->gzip_request;
+ char *gzip_body = NULL;
int err = 0, large_request = 0;
/* Try to load the entire request, if we can fit it into the
@@ -340,6 +343,7 @@ static int post_rpc(struct rpc_state *rpc)
if (left < LARGE_PACKET_MAX) {
large_request = 1;
+ use_gzip = 0;
break;
}
@@ -355,6 +359,7 @@ static int post_rpc(struct rpc_state *rpc)
curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
+ curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
headers = curl_slist_append(headers, rpc->hdr_content_type);
headers = curl_slist_append(headers, rpc->hdr_accept);
@@ -372,6 +377,49 @@ static int post_rpc(struct rpc_state *rpc)
fflush(stderr);
}
+ } else if (use_gzip && 1024 < rpc->len) {
+ /* The client backend isn't giving us compressed data so
+ * we can try to deflate it ourselves, this may save on.
+ * the transfer time.
+ */
+ size_t size;
+ z_stream stream;
+ int ret;
+
+ memset(&stream, 0, sizeof(stream));
+ ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
+ Z_DEFLATED, (15 + 16),
+ 8, Z_DEFAULT_STRATEGY);
+ if (ret != Z_OK)
+ die("cannot deflate request; zlib init error %d", ret);
+ size = deflateBound(&stream, rpc->len);
+ gzip_body = xmalloc(size);
+
+ stream.next_in = (unsigned char *)rpc->buf;
+ stream.avail_in = rpc->len;
+ stream.next_out = (unsigned char *)gzip_body;
+ stream.avail_out = size;
+
+ ret = deflate(&stream, Z_FINISH);
+ if (ret != Z_STREAM_END)
+ die("cannot deflate request; zlib deflate error %d", ret);
+
+ ret = deflateEnd(&stream);
+ if (ret != Z_OK)
+ die("cannot deflate request; zlib end error %d", ret);
+
+ size = stream.total_out;
+
+ headers = curl_slist_append(headers, "Content-Encoding: gzip");
+ curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
+ curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
+
+ if (options.verbosity > 1) {
+ fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
+ rpc->service_name,
+ (unsigned long)rpc->len, (unsigned long)size);
+ fflush(stderr);
+ }
} else {
/* We know the complete request size in advance, use the
* more normal Content-Length approach.
@@ -397,6 +445,7 @@ static int post_rpc(struct rpc_state *rpc)
}
}
curl_slist_free_all(headers);
+ free(gzip_body);
return err;
}
@@ -522,6 +571,7 @@ static int fetch_git(struct discovery *heads,
memset(&rpc, 0, sizeof(rpc));
rpc.service_name = "git-upload-pack",
rpc.argv = argv;
+ rpc.gzip_request = 1;
err = rpc_service(&rpc, heads);
if (rpc.result.len)
--
1.6.5.52.g0ff2e
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