-
Notifications
You must be signed in to change notification settings - Fork 7
/
metrics_prometheus.go
152 lines (125 loc) · 3.84 KB
/
metrics_prometheus.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
// Copyright 2019 Aporeto Inc.
// 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.
package bahamut
import (
"net/http"
"regexp"
"strconv"
"strings"
opentracing "github.com/opentracing/opentracing-go"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
var vregexp = regexp.MustCompile(`^/v/\d+`)
func sanitizeURL(url string) string {
url = vregexp.ReplaceAllString(url, "")
parts := strings.Split(url, "/")
if len(parts) <= 2 {
return url
}
parts[2] = ":id"
return strings.Join(parts, "/")
}
type prometheusMetricsManager struct {
reqDurationMetric *prometheus.SummaryVec
reqTotalMetric *prometheus.CounterVec
errorMetric *prometheus.CounterVec
wsConnTotalMetric prometheus.Counter
wsConnCurrentMetric prometheus.Gauge
handler http.Handler
}
// NewPrometheusMetricsManager returns a new MetricManager using the prometheus format.
func NewPrometheusMetricsManager() MetricsManager {
return newPrometheusMetricsManager(prometheus.DefaultRegisterer)
}
func newPrometheusMetricsManager(registerer prometheus.Registerer) MetricsManager {
mc := &prometheusMetricsManager{
handler: promhttp.Handler(),
reqTotalMetric: prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "http_requests_total",
Help: "The total number of requests.",
},
[]string{"method"},
),
reqDurationMetric: prometheus.NewSummaryVec(
prometheus.SummaryOpts{
Name: "http_requests_duration_seconds",
Help: "The average duration of the requests",
},
[]string{"method", "url"},
),
wsConnTotalMetric: prometheus.NewCounter(
prometheus.CounterOpts{
Name: "http_ws_connections_total",
Help: "The total number of ws connection.",
},
),
wsConnCurrentMetric: prometheus.NewGauge(
prometheus.GaugeOpts{
Name: "http_ws_connections_current",
Help: "The current number of ws connection.",
},
),
errorMetric: prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "http_errors_5xx_total",
Help: "The total number of 5xx errors.",
},
[]string{"trace", "method", "url", "code"},
),
}
registerer.MustRegister(mc.reqTotalMetric)
registerer.MustRegister(mc.reqDurationMetric)
registerer.MustRegister(mc.wsConnTotalMetric)
registerer.MustRegister(mc.wsConnCurrentMetric)
registerer.MustRegister(mc.errorMetric)
return mc
}
func (c *prometheusMetricsManager) MeasureRequest(method string, url string) FinishMeasurementFunc {
c.reqTotalMetric.With(prometheus.Labels{
"method": method,
}).Inc()
surl := sanitizeURL(url)
timer := prometheus.NewTimer(
prometheus.ObserverFunc(
func(v float64) {
c.reqDurationMetric.With(
prometheus.Labels{
"method": method,
"url": surl,
},
).Observe(v)
},
),
)
return func(code int, span opentracing.Span) {
if code >= http.StatusInternalServerError {
c.errorMetric.With(prometheus.Labels{
"trace": extractSpanID(span),
"method": method,
"url": surl,
"code": strconv.Itoa(code),
}).Inc()
}
timer.ObserveDuration()
}
}
func (c *prometheusMetricsManager) RegisterWSConnection() {
c.wsConnTotalMetric.Inc()
c.wsConnCurrentMetric.Inc()
}
func (c *prometheusMetricsManager) UnregisterWSConnection() {
c.wsConnCurrentMetric.Dec()
}
func (c *prometheusMetricsManager) Write(w http.ResponseWriter, r *http.Request) {
c.handler.ServeHTTP(w, r)
}