chewbranca commented on code in PR #5213: URL: https://github.com/apache/couchdb/pull/5213#discussion_r1800230079
########## src/couch_stats/src/couch_stats_resource_tracker.erl: ########## @@ -0,0 +1,912 @@ +% 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_stats_resource_tracker). + +-behaviour(gen_server). + +-export([ + start_link/0, + init/1, + handle_call/3, + handle_cast/2, + handle_info/2, + code_change/3, + terminate/2 +]). + +%% PidRef API +-export([ + get_pid_ref/0, + set_pid_ref/1, + create_pid_ref/0, + close_pid_ref/0, close_pid_ref/1 +]). + +%% Context API +-export([ + create_resource/1, + create_context/5, + create_coordinator_context/2, + create_worker_context/3, + destroy_context/0, destroy_context/1, + + get_resource/0, get_resource/1, + + set_context_dbname/1, set_context_dbname/2, + set_context_handler_fun/1, set_context_handler_fun/2, + set_context_username/1, set_context_username/2 +]). + +%% stats collection api +-export([ + is_enabled/0, + + inc/1, inc/2, + maybe_inc/2, + accumulate_delta/1, + make_delta/0, + + ioq_called/0, + + should_track/1 +]). + +%% aggregate query api +-export([ + active/0, active/1, + active_coordinators/0, active_coordinators/1, + active_workers/0, active_workers/1, + + count_by/1, + group_by/2, group_by/3, + sorted/1, + sorted_by/1, sorted_by/2, sorted_by/3, + + find_by_pid/1, + find_by_pidref/1, + find_by_nonce/1, + find_workers_by_pidref/1 +]). + +%% Process lifetime reporting api +-export([ + log_process_lifetime_report/1, + is_logging_enabled/0, + logging_enabled/0, + should_log/1, should_log/2, + tracker/1 +]). + +-include_lib("couch/include/couch_db.hrl"). +-include_lib("stdlib/include/ms_transform.hrl"). + +%% Module pdict markers +-define(DELTA_TA, csrt_delta_ta). +-define(DELTA_TZ, csrt_delta_tz). %% T Zed instead of T0 +-define(PID_REF, csrt_pid_ref). %% track local ID +-define(TRACKER_PID, csrt_tracker). %% tracker pid + +-define(MANGO_EVAL_MATCH, mango_eval_match). +-define(DB_OPEN_DOC, docs_read). +-define(DB_OPEN, db_open). +-define(COUCH_SERVER_OPEN, db_open). +-define(COUCH_BT_GET_KP_NODE, get_kp_node). +-define(COUCH_BT_GET_KV_NODE, get_kv_node). +-define(COUCH_BT_WRITE_KP_NODE, write_kp_node). +-define(COUCH_BT_WRITE_KV_NODE, write_kv_node). +-define(COUCH_JS_FILTER, js_filter). +-define(COUCH_JS_FILTER_ERROR, js_filter_error). +-define(COUCH_JS_FILTERED_DOCS, js_filtered_docs). +-define(IOQ_CALLS, ioq_calls). +-define(ROWS_READ, rows_read). + +%% TODO: overlap between this and couch btree fold invocations +%% TODO: need some way to distinguish fols on views vs find vs all_docs +-define(FRPC_CHANGES_ROW, changes_processed). +-define(FRPC_CHANGES_RETURNED, changes_returned). + +-record(st, {}). + +-record(rctx, { + %% Metadata + started_at = tnow(), + updated_at = tnow(), + pid_ref, + mfa, + nonce, + from, + type = unknown, %% unknown/background/system/rpc/coordinator/fabric_rpc/etc_rpc/etc + dbname, + username, + path, + + %% Stats counters + db_open = 0, + docs_read = 0, + rows_read = 0, + changes_processed = 0, + changes_returned = 0, + ioq_calls = 0, + io_bytes_read = 0, + io_bytes_written = 0, + js_evals = 0, + js_filter = 0, + js_filter_error = 0, + js_filtered_docs = 0, + mango_eval_match = 0, + %% TODO: switch record definitions to be macro based, eg: + %% ?COUCH_BT_GET_KP_NODE = 0, + get_kv_node = 0, + get_kp_node = 0, + write_kv_node = 0, + write_kp_node = 0 +}). + +%% +%% Public API +%% + +%% +%% PidRef operations +%% + +get_pid_ref() -> + get(?PID_REF). + +set_pid_ref(PidRef) -> + erlang:put(?PID_REF, PidRef), + PidRef. + +create_pid_ref() -> + case get_pid_ref() of + undefined -> + ok; + PidRef0 -> + %% TODO: what to do when it already exists? + throw({epidexist, PidRef0}), + close_pid_ref(PidRef0) + end, + PidRef = {self(), make_ref()}, + set_pid_ref(PidRef), + PidRef. + +close_pid_ref() -> + close_pid_ref(get_pid_ref()). + +%%close_pid_ref(undefined) -> +%% undefined; +close_pid_ref(_PidRef) -> + erase(?PID_REF). + +get_resource() -> + get_resource(get_pid_ref()). + +get_resource(undefined) -> + undefined; +get_resource(PidRef) -> + catch case ets:lookup(?MODULE, PidRef) of + [#rctx{}=Rctx] -> + Rctx; + [] -> + undefined + end. + +%% monotonic time now in millisecionds +tnow() -> + erlang:monotonic_time(millisecond). + +is_enabled() -> + config:get_boolean(?MODULE_STRING, "enabled", true). + +%% +%% Aggregate query API +%% + +active() -> active_int(all). +active_coordinators() -> active_int(coordinators). +active_workers() -> active_int(workers). Review Comment: Fixed in 5ac8a91a4. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: notifications-unsubscr...@couchdb.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
