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metrics.go
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metrics.go
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// Copyright © 2023 Horizoncd.
//
// 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 metrics
import (
"fmt"
"regexp"
"time"
"github.com/gin-gonic/gin"
middleware "github.com/horizoncd/horizon/core/middleware"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
)
const (
_handlerLabel = "handler"
_verbLabel = "verb"
_codeLabel = "code"
)
var (
apiHistogram = promauto.NewHistogramVec(
prometheus.HistogramOpts{
Name: "horizon_request_duration_seconds",
Help: "horizon request duration seconds histogram.",
Buckets: []float64{0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0,
1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 40, 50, 60},
},
[]string{_handlerLabel, _verbLabel},
)
apiCounter = promauto.NewCounterVec(
prometheus.CounterOpts{
Name: "horizon_request_total",
Help: "horizon request total counter.",
},
[]string{_handlerLabel, _verbLabel, _codeLabel},
)
)
// Middleware report metrics of handler
func Middleware(skippers ...middleware.Skipper) gin.HandlerFunc {
return middleware.New(func(c *gin.Context) {
// start timer
start := time.Now()
c.Next()
// end timer
latency := time.Since(start)
var handler string
if handler = func() string {
handlerName := c.HandlerName()
if regexp.MustCompile(`.*func\d*$`).MatchString(handlerName) {
return ""
}
return handlerName
}(); handler == "" {
return
}
statusCode := c.Writer.Status()
method := c.Request.Method
apiHistogram.With(prometheus.Labels{
_handlerLabel: handler,
_verbLabel: method,
}).Observe(latency.Seconds())
apiCounter.With(prometheus.Labels{
_handlerLabel: handler,
_verbLabel: method,
_codeLabel: fmt.Sprintf("%v", statusCode),
}).Inc()
}, skippers...)
}