khenaidoo | ffe076b | 2019-01-15 16:08:08 -0500 | [diff] [blame^] | 1 | // Copyright 2015 The etcd Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package httpproxy |
| 16 | |
| 17 | import ( |
| 18 | "net/http" |
| 19 | "strconv" |
| 20 | "time" |
| 21 | |
| 22 | "github.com/prometheus/client_golang/prometheus" |
| 23 | ) |
| 24 | |
| 25 | var ( |
| 26 | requestsIncoming = prometheus.NewCounterVec( |
| 27 | prometheus.CounterOpts{ |
| 28 | Namespace: "etcd", |
| 29 | Subsystem: "proxy", |
| 30 | Name: "requests_total", |
| 31 | Help: "Counter requests incoming by method.", |
| 32 | }, []string{"method"}) |
| 33 | |
| 34 | requestsHandled = prometheus.NewCounterVec( |
| 35 | prometheus.CounterOpts{ |
| 36 | Namespace: "etcd", |
| 37 | Subsystem: "proxy", |
| 38 | Name: "handled_total", |
| 39 | Help: "Counter of requests fully handled (by authoratitave servers)", |
| 40 | }, []string{"method", "code"}) |
| 41 | |
| 42 | requestsDropped = prometheus.NewCounterVec( |
| 43 | prometheus.CounterOpts{ |
| 44 | Namespace: "etcd", |
| 45 | Subsystem: "proxy", |
| 46 | Name: "dropped_total", |
| 47 | Help: "Counter of requests dropped on the proxy.", |
| 48 | }, []string{"method", "proxying_error"}) |
| 49 | |
| 50 | requestsHandlingTime = prometheus.NewHistogramVec( |
| 51 | prometheus.HistogramOpts{ |
| 52 | Namespace: "etcd", |
| 53 | Subsystem: "proxy", |
| 54 | Name: "handling_duration_seconds", |
| 55 | Help: "Bucketed histogram of handling time of successful events (non-watches), by method " + |
| 56 | "(GET/PUT etc.).", |
| 57 | Buckets: prometheus.ExponentialBuckets(0.0005, 2, 13), |
| 58 | }, []string{"method"}) |
| 59 | ) |
| 60 | |
| 61 | type forwardingError string |
| 62 | |
| 63 | const ( |
| 64 | zeroEndpoints forwardingError = "zero_endpoints" |
| 65 | failedSendingRequest forwardingError = "failed_sending_request" |
| 66 | failedGettingResponse forwardingError = "failed_getting_response" |
| 67 | ) |
| 68 | |
| 69 | func init() { |
| 70 | prometheus.MustRegister(requestsIncoming) |
| 71 | prometheus.MustRegister(requestsHandled) |
| 72 | prometheus.MustRegister(requestsDropped) |
| 73 | prometheus.MustRegister(requestsHandlingTime) |
| 74 | } |
| 75 | |
| 76 | func reportIncomingRequest(request *http.Request) { |
| 77 | requestsIncoming.WithLabelValues(request.Method).Inc() |
| 78 | } |
| 79 | |
| 80 | func reportRequestHandled(request *http.Request, response *http.Response, startTime time.Time) { |
| 81 | method := request.Method |
| 82 | requestsHandled.WithLabelValues(method, strconv.Itoa(response.StatusCode)).Inc() |
| 83 | requestsHandlingTime.WithLabelValues(method).Observe(time.Since(startTime).Seconds()) |
| 84 | } |
| 85 | |
| 86 | func reportRequestDropped(request *http.Request, err forwardingError) { |
| 87 | requestsDropped.WithLabelValues(request.Method, string(err)).Inc() |
| 88 | } |