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% Licensed under the Apache License, Version 2.0 (the "License"); you may not
% use this file except in compliance with the License. You may obtain a copy of
% the License at
%
% http://www.apache.org/licenses/LICENSE-2.0
%
% Unless required by applicable law or agreed to in writing, software
% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
% License for the specific language governing permissions and limitations under
% the License.
-module(couch_rep_writer).
-export([start_link/4]).
-include("couch_db.hrl").
-define (MAX_BYTES, 10000000).
start_link(Parent, Target, Reader, _PostProps) ->
{ok, spawn_link(fun() -> writer_loop(Parent, Reader, Target) end)}.
make_chunk(Data) when is_list(Data) ->
make_chunk(list_to_binary(Data));
make_chunk(Data) ->
Size = size(Data),
{Size, [ibrowse_lib:dec2hex(8, Size), "\r\n", Data, "\r\n"]}.
upload_docs({start, W, Docs}) ->
{Size, Chunk} = make_chunk(<<"{\"new_edits\":false, \"docs\":[">>),
{ok, Chunk, {continue, W, Docs, "", Size}};
upload_docs({continue, W, Docs, _, ByteCount}) when ByteCount > ?MAX_BYTES ->
W ! {docs_remaining, length(Docs)},
{ok, "2\r\n]}\r\n", last_chunk};
upload_docs({continue, W, [Doc|Rest], Prepend, ByteCount}) ->
JsonDoc = ?JSON_ENCODE(couch_doc:to_json_obj(Doc, [revs,attachments])),
{Size, Chunk} = make_chunk([Prepend, JsonDoc]),
{ok, Chunk, {continue, W, Rest, ",", ByteCount+Size}};
upload_docs({continue, W, [], _, _}) ->
W ! {docs_remaining, 0},
{ok, "2\r\n]}\r\n", last_chunk};
upload_docs(last_chunk) ->
{ok, "0\r\n\r\n", finish};
upload_docs(finish) ->
couch_util:should_flush(),
eof.
writer_loop(Parent, Reader, Target) ->
case couch_rep_reader:next(Reader) of
{complete, FinalSeq} ->
Parent ! {writer_checkpoint, FinalSeq},
ok;
{HighSeq, Docs} ->
DocCount = length(Docs),
try write_docs(Target, Docs, []) of
{ok, []} ->
Parent ! {update_stats, docs_written, DocCount};
{ok, Errors} ->
ErrorCount = length(Errors),
Parent ! {update_stats, doc_write_failures, ErrorCount},
Parent ! {update_stats, docs_written, DocCount - ErrorCount}
catch
{attachment_request_failed, Err} ->
?LOG_DEBUG("writer failed to write an attachment ~p", [Err]),
exit({attachment_request_failed, Err, Docs})
end,
Parent ! {writer_checkpoint, HighSeq},
couch_rep_att:cleanup(),
couch_util:should_flush(),
writer_loop(Parent, Reader, Target)
end.
write_docs(#http_db{} = Db, Docs, ErrorsAcc) ->
ErrorsJson = couch_rep_httpc:request(Db#http_db{
resource = "_bulk_docs",
method = post,
body = {fun upload_docs/1, {start, self(), Docs}},
headers = [{"transfer-encoding", "chunked"} | Db#http_db.headers]
}),
ErrorsList =
lists:map(
fun({Props}) ->
Id = proplists:get_value(<<"id">>, Props),
Rev = couch_doc:parse_rev(proplists:get_value(<<"rev">>, Props)),
ErrId = couch_util:to_existing_atom(
proplists:get_value(<<"error">>, Props)),
Reason = proplists:get_value(<<"reason">>, Props),
{{Id, Rev}, {ErrId, Reason}}
end, ErrorsJson),
receive
{docs_remaining, 0} ->
{ok, lists:flatten([ErrorsList|ErrorsAcc])};
{docs_remaining, N} ->
MoreDocs = lists:nthtail(length(Docs)-N, Docs),
write_docs(Db, MoreDocs, [ErrorsList|ErrorsAcc])
end;
write_docs(Db, Docs, _) ->
couch_db:update_docs(Db, Docs, [], replicated_changes).
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