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package prome
import (
"context"
"fmt"
"git.diulo.com/mogfee/kit/middleware"
"git.diulo.com/mogfee/kit/transport"
"github.com/prometheus/client_golang/prometheus"
"time"
)
const namespace = "service"
var (
labels = []string{"status", "endpoint", "method"}
uptime = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Name: "uptime",
Help: "HTTP service uptime.",
}, nil)
reqCount = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Name: "http_request_count_total",
Help: "Total number of HTTP requests made.",
}, labels)
reqDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
Namespace: namespace,
Name: "http_request_duration_seconds",
Help: "HTTP request latencies in seconds.",
}, labels)
reqSizeBytes = prometheus.NewSummaryVec(prometheus.SummaryOpts{
Namespace: namespace,
Name: "http_request_size_bytes",
Help: "HTTP request sizes in bytes.",
}, labels)
respSizeBytes = prometheus.NewSummaryVec(prometheus.SummaryOpts{
Namespace: namespace,
Name: "http_response_size_bytes",
Help: "HTTP request sizes in bytes.",
}, labels)
)
func init() {
prometheus.MustRegister(uptime, reqCount, reqDuration, reqSizeBytes, respSizeBytes)
go recordUptime()
}
func recordUptime() {
for range time.Tick(time.Second) {
uptime.WithLabelValues().Inc()
}
}
func Prometheus() middleware.Middleware {
return func(handler middleware.Handler) middleware.Handler {
return func(ctx context.Context, a any) (any, error) {
tr, ok := transport.FromServerContext(ctx)
if !ok {
return handler(ctx, a)
}
start := time.Now()
resp, err := handler(ctx, a)
code := "500"
if err != nil {
switch aerr := err.(type) {
case *errorx.Error:
code = fmt.Sprintf("%d", aerr.Code)
default:
code = "500"
}
}
lvs := []string{code, tr.Endpoint(), tr.Operation()}
reqCount.WithLabelValues(lvs...).Inc()
reqDuration.WithLabelValues(lvs...).Observe(time.Since(start).Seconds())
return resp, err
}
}
}