From cff79d01f26f2a4917204fcf3dd8d4d4d57271bc Mon Sep 17 00:00:00 2001
From: Filipe David Borba Manana <fdmanana@apache.org>
Date: Tue, 28 Sep 2010 16:49:58 +0000
Subject: Replicator fix: for a filtered replication, the replication ID should
 take into account the filter function's code and not only its name.

Closes COUCHDB-892.


git-svn-id: https://svn.apache.org/repos/asf/couchdb/trunk@1002259 13f79535-47bb-0310-9956-ffa450edef68
---
 src/couchdb/couch_rep.erl | 45 ++++++++++++++++++++++++++++-----------------
 1 file changed, 28 insertions(+), 17 deletions(-)

(limited to 'src')

diff --git a/src/couchdb/couch_rep.erl b/src/couchdb/couch_rep.erl
index 6dbd3c7c..85ecc99e 100644
--- a/src/couchdb/couch_rep.erl
+++ b/src/couchdb/couch_rep.erl
@@ -486,14 +486,14 @@ make_replication_id({Props}, UserCtx, 2) ->
     Port = mochiweb_socket_server:get(couch_httpd, port),
     Src = get_rep_endpoint(UserCtx, ?getv(<<"source">>, Props)),
     Tgt = get_rep_endpoint(UserCtx, ?getv(<<"target">>, Props)),
-    maybe_append_filters({Props}, [HostName, Port, Src, Tgt]);
+    maybe_append_filters({Props}, [HostName, Port, Src, Tgt], UserCtx);
 make_replication_id({Props}, UserCtx, 1) ->
     {ok, HostName} = inet:gethostname(),
     Src = get_rep_endpoint(UserCtx, ?getv(<<"source">>, Props)),
     Tgt = get_rep_endpoint(UserCtx, ?getv(<<"target">>, Props)),
-    maybe_append_filters({Props}, [HostName, Src, Tgt]).
+    maybe_append_filters({Props}, [HostName, Src, Tgt], UserCtx).
 
-maybe_append_filters({Props}, Base) ->
+maybe_append_filters({Props}, Base, UserCtx) ->
     Base2 = Base ++ 
         case ?getv(<<"filter">>, Props) of
         undefined ->
@@ -504,10 +504,20 @@ maybe_append_filters({Props}, Base) ->
                 [DocIds]
             end;
         Filter ->
-            [Filter, ?getv(<<"query_params">>, Props, {[]})]
+            [filter_code(Filter, Props, UserCtx),
+                ?getv(<<"query_params">>, Props, {[]})]
         end,
     couch_util:to_hex(couch_util:md5(term_to_binary(Base2))).
 
+filter_code(Filter, Props, UserCtx) ->
+    {match, [DDocName, FilterName]} =
+        re:run(Filter, "(.*?)/(.*)", [{capture, [1, 2], binary}]),
+    ProxyParams = parse_proxy_params(?getv(<<"proxy">>, Props, [])),
+    Source = open_db(?getv(<<"source">>, Props), UserCtx, ProxyParams),
+    {ok, #doc{body = Body}} = open_doc(Source, <<"_design/", DDocName/binary>>),
+    Code = couch_util:get_nested_json_value(Body, [<<"filters">>, FilterName]),
+    re:replace(Code, "^\s*(.*?)\s*$", "\\1", [{return, binary}]).
+
 maybe_add_trailing_slash(Url) ->
     re:replace(Url, "[^/]$", "&/", [{return, list}]).
 
@@ -556,26 +566,27 @@ fold_replication_logs([Db|Rest]=Dbs, Vsn, LogId, NewId,
             RepProps, UserCtx, [MigratedLog|Acc])
     end.
 
-open_replication_log(#http_db{}=Db, DocId) ->
-    Req = Db#http_db{resource=couch_util:encode_doc_id(DocId)},
-    case couch_rep_httpc:request(Req) of
-    {[{<<"error">>, _}, {<<"reason">>, _}]} ->
-        ?LOG_DEBUG("didn't find a replication log for ~s", [Db#http_db.url]),
-        {error, not_found};
-    Doc ->
-        ?LOG_DEBUG("found a replication log for ~s", [Db#http_db.url]),
-        {ok, couch_doc:from_json_obj(Doc)}
-    end;
 open_replication_log(Db, DocId) ->
-    case couch_db:open_doc(Db, DocId, []) of
+    case open_doc(Db, DocId) of
     {ok, Doc} ->
-        ?LOG_DEBUG("found a replication log for ~s", [Db#db.name]),
+        ?LOG_DEBUG("found a replication log for ~s", [dbname(Db)]),
         {ok, Doc};
     _ ->
-        ?LOG_DEBUG("didn't find a replication log for ~s", [Db#db.name]),
+        ?LOG_DEBUG("didn't find a replication log for ~s", [dbname(Db)]),
         {error, not_found}
     end.
 
+open_doc(#http_db{} = Db, DocId) ->
+    Req = Db#http_db{resource = couch_util:encode_doc_id(DocId)},
+    case couch_rep_httpc:request(Req) of
+    {[{<<"error">>, _}, {<<"reason">>, _}]} ->
+        {error, not_found};
+    Doc ->
+        {ok, couch_doc:from_json_obj(Doc)}
+    end;
+open_doc(Db, DocId) ->
+    couch_db:open_doc(Db, DocId).
+
 open_db(Props, UserCtx, ProxyParams) ->
     open_db(Props, UserCtx, ProxyParams, false).
 
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