iilyak commented on a change in pull request #470: Scheduling Replicator URL: https://github.com/apache/couchdb/pull/470#discussion_r112542866
########## File path: src/couch_replicator/src/couch_replicator_docs.erl ########## @@ -0,0 +1,756 @@ +% 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_replicator_docs). + +-export([ + parse_rep_doc/1, + parse_rep_doc/2, + parse_rep_db/3, + parse_rep_doc_without_id/1, + parse_rep_doc_without_id/2, + before_doc_update/2, + after_doc_read/2, + ensure_rep_db_exists/0, + ensure_rep_ddoc_exists/1, + ensure_cluster_rep_ddoc_exists/1, + remove_state_fields/2, + update_doc_completed/3, + update_failed/3, + update_rep_id/1, + update_triggered/2, + update_error/2 +]). + + +-include_lib("couch/include/couch_db.hrl"). +-include_lib("ibrowse/include/ibrowse.hrl"). +-include_lib("mem3/include/mem3.hrl"). +-include("couch_replicator_api_wrap.hrl"). +-include("couch_replicator.hrl"). +-include("couch_replicator_js_functions.hrl"). + +-import(couch_util, [ + get_value/2, + get_value/3, + to_binary/1 +]). + +-import(couch_replicator_utils, [ + get_json_value/2, + get_json_value/3 +]). + + +-define(REP_DB_NAME, <<"_replicator">>). +-define(REP_DESIGN_DOC, <<"_design/_replicator">>). +-define(OWNER, <<"owner">>). +-define(CTX, {user_ctx, #user_ctx{roles=[<<"_admin">>, <<"_replicator">>]}}). +-define(replace(L, K, V), lists:keystore(K, 1, L, {K, V})). + + +remove_state_fields(DbName, DocId) -> + update_rep_doc(DbName, DocId, [ + {<<"_replication_state">>, undefined}, + {<<"_replication_state_time">>, undefined}, + {<<"_replication_state_reason">>, undefined}, + {<<"_replication_id">>, undefined}, + {<<"_replication_stats">>, undefined}]). + + +-spec update_doc_completed(binary(), binary(), [_]) -> any(). +update_doc_completed(DbName, DocId, Stats) -> + update_rep_doc(DbName, DocId, [ + {<<"_replication_state">>, <<"completed">>}, + {<<"_replication_state_reason">>, undefined}, + {<<"_replication_stats">>, {Stats}}]), + couch_stats:increment_counter([couch_replicator, docs, + completed_state_updates]). + + +-spec update_failed(binary(), binary(), any()) -> any(). +update_failed(DbName, DocId, Error) -> + Reason = error_reason(Error), + couch_log:error("Error processing replication doc `~s` from `~s`: ~s", + [DocId, DbName, Reason]), + update_rep_doc(DbName, DocId, [ + {<<"_replication_state">>, <<"failed">>}, + {<<"_replication_stats">>, undefined}, + {<<"_replication_state_reason">>, Reason}]), + couch_stats:increment_counter([couch_replicator, docs, + failed_state_updates]). + + +-spec update_triggered(#rep{}, rep_id()) -> ok. +update_triggered(Rep, {Base, Ext}) -> + #rep{ + db_name = DbName, + doc_id = DocId + } = Rep, + update_rep_doc(DbName, DocId, [ + {<<"_replication_state">>, <<"triggered">>}, + {<<"_replication_state_reason">>, undefined}, + {<<"_replication_id">>, iolist_to_binary([Base, Ext])}, + {<<"_replication_stats">>, undefined}]), + ok. + + +-spec update_error(#rep{}, any()) -> ok. +update_error(#rep{db_name = DbName, doc_id = DocId, id = RepId}, Error) -> + Reason = error_reason(Error), + BinRepId = case RepId of + {Base, Ext} -> + iolist_to_binary([Base, Ext]); + _Other -> + null + end, + update_rep_doc(DbName, DocId, [ + {<<"_replication_state">>, <<"error">>}, + {<<"_replication_state_reason">>, Reason}, + {<<"_replication_stats">>, undefined}, + {<<"_replication_id">>, BinRepId}]), + ok. + + +-spec ensure_rep_db_exists() -> {ok, #db{}}. +ensure_rep_db_exists() -> + Db = case couch_db:open_int(?REP_DB_NAME, [?CTX, sys_db, + nologifmissing]) of + {ok, Db0} -> + Db0; + _Error -> + {ok, Db0} = couch_db:create(?REP_DB_NAME, [?CTX, sys_db]), + Db0 + end, + ok = ensure_rep_ddoc_exists(?REP_DB_NAME), + {ok, Db}. + + +-spec ensure_rep_ddoc_exists(binary()) -> ok. +ensure_rep_ddoc_exists(RepDb) -> + case mem3:belongs(RepDb, ?REP_DESIGN_DOC) of + true -> + ensure_rep_ddoc_exists(RepDb, ?REP_DESIGN_DOC); + false -> + ok + end. + + +-spec ensure_rep_ddoc_exists(binary(), binary()) -> ok. +ensure_rep_ddoc_exists(RepDb, DDocId) -> + case open_rep_doc(RepDb, DDocId) of + {not_found, no_db_file} -> + %% database was deleted. + ok; + {not_found, _Reason} -> + DocProps = replication_design_doc_props(DDocId), + DDoc = couch_doc:from_json_obj({DocProps}), + couch_log:notice("creating replicator ddoc", []), Review comment: Could you log RepDb name as well here? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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