From 3072bbc46e4d9e0bc2938776c965a5d2e6a15881 Mon Sep 17 00:00:00 2001
From: Benoit Chesneau <benoitc@apache.org>
Date: Wed, 13 Oct 2010 21:02:46 +0000
Subject: get _changes on specific docids

/POST /db/_changes
{"doc_ids": ["docid1", ...]}



git-svn-id: https://svn.apache.org/repos/asf/couchdb/trunk@1022291 13f79535-47bb-0310-9956-ffa450edef68
---
 src/couchdb/couch_changes.erl  | 15 +++++++++++++++
 src/couchdb/couch_httpd_db.erl | 32 +++++++++++++++++++++++++++-----
 2 files changed, 42 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/couchdb/couch_changes.erl b/src/couchdb/couch_changes.erl
index dd884cad..6fc4597a 100644
--- a/src/couchdb/couch_changes.erl
+++ b/src/couchdb/couch_changes.erl
@@ -78,6 +78,21 @@ get_callback_acc(Callback) when is_function(Callback, 2) ->
     {fun(Ev, Data, _) -> Callback(Ev, Data) end, ok}.
 
 %% @type Req -> #httpd{} | {json_req, JsonObj()}
+make_filter_fun({docids, Docids}, Style, _Req, _Db) ->
+    fun(#doc_info{id=DocId, revs=[#rev_info{rev=Rev}|_]=Revs}) ->
+        case lists:member(DocId, Docids) of
+        true ->
+            case Style of
+            main_only ->
+                [{[{<<"rev">>, couch_doc:rev_to_str(Rev)}]}];
+            all_docs ->
+                [{[{<<"rev">>, couch_doc:rev_to_str(R)}]}
+                        || #rev_info{rev=R} <- Revs]
+            end;
+        _ -> []
+        end
+    end;
+
 make_filter_fun(FilterName, Style, Req, Db) ->
     case [list_to_binary(couch_httpd:unquote(Part))
             || Part <- string:tokens(FilterName, "/")] of
diff --git a/src/couchdb/couch_httpd_db.erl b/src/couchdb/couch_httpd_db.erl
index 51c9ae9a..412b6e99 100644
--- a/src/couchdb/couch_httpd_db.erl
+++ b/src/couchdb/couch_httpd_db.erl
@@ -56,6 +56,25 @@ handle_request(#httpd{path_parts=[DbName|RestParts],method=Method,
     end.
 
 handle_changes_req(#httpd{method='GET'}=Req, Db) ->
+    handle_changes_req1(Req, Db, nil);
+
+handle_changes_req(#httpd{method='POST'}=Req, Db) ->
+    couch_httpd:validate_ctype(Req, "application/json"),
+    {Props} = couch_httpd:json_body_obj(Req),
+    case couch_util:get_value(<<"doc_ids">>, Props, nil) of
+    nil ->
+        handle_changes_req1(Req, Db, nil);
+    Docids when is_list(Docids) ->
+        handle_changes_req1(Req, Db, Docids);
+    _ ->
+        throw({bad_request, "`docids` member must be a array."}) 
+    end;
+
+handle_changes_req(#httpd{path_parts=[_,<<"_changes">>]}=Req, _Db) ->
+    send_method_not_allowed(Req, "GET,HEAD,POST").
+
+
+handle_changes_req1(Req, Db, Docids) ->
     MakeCallback = fun(Resp) ->
         fun({change, Change, _}, "continuous") ->
             send_chunk(Resp, [?JSON_ENCODE(Change) | "\n"]);
@@ -82,8 +101,13 @@ handle_changes_req(#httpd{method='GET'}=Req, Db) ->
         end
     end,
     ChangesArgs = parse_changes_query(Req),
-    ChangesFun = couch_changes:handle_changes(ChangesArgs, Req, Db),
-    WrapperFun = case ChangesArgs#changes_args.feed of
+    ChangesArgs1 = case Docids of
+        nil -> ChangesArgs;
+        _ -> ChangesArgs#changes_args{filter={docids, Docids}}
+    end,
+
+    ChangesFun = couch_changes:handle_changes(ChangesArgs1, Req, Db),
+    WrapperFun = case ChangesArgs1#changes_args.feed of
     "normal" ->
         {ok, Info} = couch_db:get_db_info(Db),
         CurrentEtag = couch_httpd:make_etag(Info),
@@ -109,10 +133,8 @@ handle_changes_req(#httpd{method='GET'}=Req, Db) ->
     couch_stats_collector:track_process_count(
         {httpd, clients_requesting_changes}
     ),
-    WrapperFun(ChangesFun);
+    WrapperFun(ChangesFun).
 
-handle_changes_req(#httpd{path_parts=[_,<<"_changes">>]}=Req, _Db) ->
-    send_method_not_allowed(Req, "GET,HEAD").
 
 handle_compact_req(#httpd{method='POST',path_parts=[DbName,_,Id|_]}=Req, Db) ->
     ok = couch_db:check_is_admin(Db),
-- 
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