The only way to fetch new revisions from a wiki before this patch was to
query each page for new revisions. This is good when tracking a small set
of pages on a large wiki, but very inefficient when tracking many pages
on a wiki with little activity.
Implement a new strategy that queries the wiki for its last global
revision, queries each new revision, and filter out pages that are not
tracked.
Signed-off-by: Simon Perrat <simon.perrat@xxxxxxxxxxxxxxx>
Signed-off-by: Simon CATHEBRAS <Simon.Cathebras@xxxxxxxxxxxxxxx>
Signed-off-by: Julien KHAYAT <Julien.Khayat@xxxxxxxxxxxxxxx>
Signed-off-by: Charles ROUSSEL <Charles.Roussel@xxxxxxxxxxxxxxx>
Signed-off-by: Guillaume SASDY <Guillaume.Sasdy@xxxxxxxxxxxxxxx>
Signed-off-by: Matthieu Moy <Matthieu.Moy@xxxxxxx>
---
contrib/mw-to-git/git-remote-mediawiki | 114 +++++++++++++++++++++++++------
contrib/mw-to-git/t/t9364-pull-by-rev.sh | 17 +++++
2 files changed, 110 insertions(+), 21 deletions(-)
create mode 100755 contrib/mw-to-git/t/t9364-pull-by-rev.sh
diff --git a/contrib/mw-to-git/git-remote-mediawiki b/contrib/mw-to-git/git-remote-mediawiki
index 9305204..6bf1d1a 100755
--- a/contrib/mw-to-git/git-remote-mediawiki
+++ b/contrib/mw-to-git/git-remote-mediawiki
@@ -13,12 +13,9 @@
#
# Known limitations:
#
-# - Poor performance in the best case: it takes forever to check
-# whether we're up-to-date (on fetch or push) or to fetch a few
-# revisions from a large wiki, because we use exclusively a
-# page-based synchronization. We could switch to a wiki-wide
-# synchronization when the synchronization involves few revisions
-# but the wiki is large.
+# - Several strategies are provided to fetch modifications from the
+# wiki, but no automatic heuristics is provided, the user has
+# to understand and chose which strategy is appropriate for him.
#
# - Git renames could be turned into MediaWiki renames (see TODO
# below)
@@ -89,6 +86,21 @@ my $shallow_import = run_git("config --get --bool remote.". $remotename .".shall
chomp($shallow_import);
$shallow_import = ($shallow_import eq "true");
+# Fetch (clone and pull) by revisions instead of by pages. This behavior
+# is more efficient when we have a wiki with lots of pages and we fetch
+# the revisions quite often so that they concern only few pages.
+# Possible values:
+# - by_rev: perform one query per new revision on the remote wiki
+# - by_page: query each tracked page for new revision
+my $fetch_strategy = run_git("config --get remote.$remotename.fetchStrategy");
+unless ($fetch_strategy) {
+ $fetch_strategy = run_git("config --get mediawiki.fetchStrategy");
+}
+chomp($fetch_strategy);
+unless ($fetch_strategy) {
+ $fetch_strategy = "by_page";
+}
+
# Dumb push: don't update notes and mediawiki ref to reflect the last push.
#
# Configurable with mediawiki.dumbPush, or per-remote with
@@ -533,6 +545,26 @@ sub get_last_local_revision {
# Remember the timestamp corresponding to a revision id.
my %basetimestamps;
+# Get the last remote revision without taking in account which pages are
+# tracked or not. This function makes a single request to the wiki thus
+# avoid a loop onto all tracked pages. This is useful for the fetch-by-rev
+# option.
+sub get_last_global_remote_rev {
+ mw_connect_maybe();
+
+ my $query = {
+ action => 'query',
+ list => 'recentchanges',
+ prop => 'revisions',
+ rclimit => '1',
+ rcdir => 'older',
+ };
+ my $result = $mediawiki->api($query);
+ return $result->{query}->{recentchanges}[0]->{revid};
+}
+
+# Get the last remote revision concerning the tracked pages and the tracked
+# categories.
sub get_last_remote_revision {
mw_connect_maybe();
@@ -803,9 +835,6 @@ sub mw_import_ref {
mw_connect_maybe();
- my %pages_hash = get_mw_pages();
- my @pages = values(%pages_hash);
-
print STDERR "Searching revisions...\n";
my $last_local = get_last_local_revision();
my $fetch_from = $last_local + 1;
@@ -814,10 +843,35 @@ sub mw_import_ref {
} else {
print STDERR ", fetching from here.\n";
}
- my ($n, @revisions) = fetch_mw_revisions(\@pages, $fetch_from);
- # Creation of the fast-import stream
- print STDERR "Fetching & writing export data...\n";
+ my $n = 0;
+ if ($fetch_strategy eq "by_rev") {
+ print STDERR "Fetching & writing export data by revs...\n";
+ $n = mw_import_ref_by_revs($fetch_from);
+ } elsif ($fetch_strategy eq "by_page") {
+ print STDERR "Fetching & writing export data by pages...\n";
+ $n = mw_import_ref_by_pages($fetch_from);
+ } else {
+ print STDERR "fatal: invalid fetch strategy \"$fetch_strategy\".\n";
+ print STDERR "Check your configuration variables remote.$remotename.fetchStrategy and mediawiki.fetchStrategy\n";
+ exit 1;
+ }
+
+ if ($fetch_from == 1 && $n == 0) {
+ print STDERR "You appear to have cloned an empty MediaWiki.\n";
+ # Something has to be done remote-helper side. If nothing is done, an error is
+ # thrown saying that HEAD is refering to unknown object 0000000000000000000
+ # and the clone fails.
+ }
+}
+
+sub mw_import_ref_by_pages {
+
+ my $fetch_from = shift;
+ my %pages_hash = get_mw_pages();
+ my @pages = values(%pages_hash);
+
+ my ($n, @revisions) = fetch_mw_revisions(\@pages, $fetch_from);
@revisions = sort {$a->{revid} <=> $b->{revid}} @revisions;
my @revision_ids = map $_->{revid}, @revisions;
@@ -825,12 +879,26 @@ sub mw_import_ref {
return mw_import_revids($fetch_from, \@revision_ids, \%pages_hash);
}
+sub mw_import_ref_by_revs {
+
+ my $fetch_from = shift;
+ my %pages_hash = get_mw_pages();
+
+ my $last_remote = get_last_global_remote_rev();
+ my @revision_ids = $fetch_from..$last_remote;
+ return mw_import_revids($fetch_from, \@revision_ids, \%pages_hash);
+}
+
+# Import revisions given in second argument (array of integers).
+# Only pages appearing in the third argument (hash indexed by page titles)
+# will be imported.
sub mw_import_revids {
my $fetch_from = shift;
my $revision_ids = shift;
my $pages = shift;
my $n = 0;
+ my $n_actual = 0;
my $last_timestamp = 0; # Placeholer in case $rev->timestamp is undefined
foreach my $pagerevid (@$revision_ids) {
@@ -848,9 +916,20 @@ sub mw_import_revids {
my $result_page = $result_pages[0];
my $rev = $result_pages[0]->{revisions}->[0];
+ # Count page even if we skip it, since we display
+ # $n/$total and $total includes skipped pages.
$n++;
my $page_title = $result_page->{title};
+
+ if (!exists($pages->{$page_title})) {
+ print STDERR "$n/", scalar(@$revision_ids),
+ ": Skipping revision #$rev->{revid} of $page_title\n";
+ next;
+ }
+
+ $n_actual++;
+
my %commit;
$commit{author} = $rev->{user} || 'Anonymous';
$commit{comment} = $rev->{comment} || '*Empty MediaWiki Message*';
@@ -875,17 +954,10 @@ sub mw_import_revids {
# of a file do one common commit for both file and media page.
# Else do commit only for that page.
print STDERR "$n/", scalar(@$revision_ids), ": Revision #$rev->{revid} of $commit{title}\n";
- import_file_revision(\%commit, ($fetch_from == 1), $n, \%mediafile);
- }
-
- if ($fetch_from == 1 && $n == 0) {
- print STDERR "You appear to have cloned an empty MediaWiki.\n";
- # Something has to be done remote-helper side. If nothing is done, an error is
- # thrown saying that HEAD is refering to unknown object 0000000000000000000
- # and the clone fails.
+ import_file_revision(\%commit, ($fetch_from == 1), $n_actual, \%mediafile);
}
- return $n;
+ return $n_actual;
}
sub error_non_fast_forward {
diff --git a/contrib/mw-to-git/t/t9364-pull-by-rev.sh b/contrib/mw-to-git/t/t9364-pull-by-rev.sh
new file mode 100755
index 0000000..5c22457
--- /dev/null
+++ b/contrib/mw-to-git/t/t9364-pull-by-rev.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+test_description='Test the Git Mediawiki remote helper: git pull by revision'
+
+. ./test-gitmw-lib.sh
+. ./push-pull-tests.sh
+. $TEST_DIRECTORY/test-lib.sh
+
+test_check_precond
+
+test_expect_success 'configuration' '
+ git config --global mediawiki.fetchStrategy by_rev
+'
+
+test_push_pull
+
+test_done
--
1.7.11.1.147.g47a574d
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