| % 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(chttpd_stats). |
| |
| |
| -export([ |
| init/0, |
| report/2, |
| |
| incr_reads/0, |
| incr_reads/1, |
| |
| incr_writes/0, |
| incr_writes/1, |
| |
| incr_rows/0, |
| incr_rows/1 |
| ]). |
| |
| |
| -record(st, { |
| reads = 0, |
| writes = 0, |
| rows = 0 |
| }). |
| |
| |
| -define(KEY, chttpd_stats). |
| |
| |
| init() -> |
| put(?KEY, #st{}). |
| |
| |
| report(HttpReq, HttpResp) -> |
| try |
| case get(?KEY) of |
| #st{} = St -> |
| report(HttpReq, HttpResp, St); |
| _ -> |
| ok |
| end |
| catch T:R -> |
| S = erlang:get_stacktrace(), |
| Fmt = "Failed to report chttpd request stats: ~p:~p ~p", |
| couch_log:error(Fmt, [T, R, S]) |
| end. |
| |
| |
| report(HttpReq, HttpResp, St) -> |
| case config:get("chttpd", "stats_reporter") of |
| undefined -> |
| ok; |
| ModStr -> |
| Mod = list_to_existing_atom(ModStr), |
| #st{ |
| reads = Reads, |
| writes = Writes, |
| rows = Rows |
| } = St, |
| Mod:report(HttpReq, HttpResp, Reads, Writes, Rows) |
| end. |
| |
| |
| incr_reads() -> |
| incr(#st.reads, 1). |
| |
| |
| incr_reads(N) when is_integer(N), N >= 0 -> |
| incr(#st.reads, N). |
| |
| |
| incr_writes() -> |
| incr(#st.writes, 1). |
| |
| |
| incr_writes(N) when is_integer(N), N >= 0 -> |
| incr(#st.writes, N). |
| |
| |
| incr_rows() -> |
| incr(#st.rows, 1). |
| |
| |
| incr_rows(N) when is_integer(N), N >= 0 -> |
| incr(#st.rows, N). |
| |
| |
| incr(Idx, Count) -> |
| case get(?KEY) of |
| #st{} = St -> |
| Total = element(Idx, St) + Count, |
| NewSt = setelement(Idx, St, Total), |
| put(?KEY, NewSt); |
| _ -> |
| ok |
| end. |