mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
43386ac29b
This PR resolves an issue where the `/metrics` endpoints exposed by the proxy were not returning metrics of the etcd members servers but of the proxy itself. Signed-off-by: Sam Batschelet <sbatsche@redhat.com>
115 lines
3.2 KiB
Go
115 lines
3.2 KiB
Go
// Copyright 2016 The etcd Authors
|
|
//
|
|
// 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 grpcproxy
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"math/rand"
|
|
"net/http"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/coreos/etcd/etcdserver/api/etcdhttp"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
)
|
|
|
|
var (
|
|
watchersCoalescing = prometheus.NewGauge(prometheus.GaugeOpts{
|
|
Namespace: "etcd",
|
|
Subsystem: "grpc_proxy",
|
|
Name: "watchers_coalescing_total",
|
|
Help: "Total number of current watchers coalescing",
|
|
})
|
|
eventsCoalescing = prometheus.NewCounter(prometheus.CounterOpts{
|
|
Namespace: "etcd",
|
|
Subsystem: "grpc_proxy",
|
|
Name: "events_coalescing_total",
|
|
Help: "Total number of events coalescing",
|
|
})
|
|
cacheKeys = prometheus.NewGauge(prometheus.GaugeOpts{
|
|
Namespace: "etcd",
|
|
Subsystem: "grpc_proxy",
|
|
Name: "cache_keys_total",
|
|
Help: "Total number of keys/ranges cached",
|
|
})
|
|
cacheHits = prometheus.NewGauge(prometheus.GaugeOpts{
|
|
Namespace: "etcd",
|
|
Subsystem: "grpc_proxy",
|
|
Name: "cache_hits_total",
|
|
Help: "Total number of cache hits",
|
|
})
|
|
cachedMisses = prometheus.NewGauge(prometheus.GaugeOpts{
|
|
Namespace: "etcd",
|
|
Subsystem: "grpc_proxy",
|
|
Name: "cache_misses_total",
|
|
Help: "Total number of cache misses",
|
|
})
|
|
)
|
|
|
|
func init() {
|
|
prometheus.MustRegister(watchersCoalescing)
|
|
prometheus.MustRegister(eventsCoalescing)
|
|
prometheus.MustRegister(cacheKeys)
|
|
prometheus.MustRegister(cacheHits)
|
|
prometheus.MustRegister(cachedMisses)
|
|
}
|
|
|
|
// HandleMetrics performs a GET request against etcd endpoint and returns '/metrics'.
|
|
func HandleMetrics(mux *http.ServeMux, c *http.Client, eps []string) {
|
|
// random shuffle endpoints
|
|
r := rand.New(rand.NewSource(int64(time.Now().Nanosecond())))
|
|
if len(eps) > 1 {
|
|
eps = shuffleEndpoints(r, eps)
|
|
}
|
|
|
|
pathMetrics := etcdhttp.PathMetrics
|
|
mux.HandleFunc(pathMetrics, func(w http.ResponseWriter, r *http.Request) {
|
|
target := fmt.Sprintf("%s%s", eps[0], pathMetrics)
|
|
if !strings.HasPrefix(target, "http") {
|
|
scheme := "http"
|
|
if r.TLS != nil {
|
|
scheme = "https"
|
|
}
|
|
target = fmt.Sprintf("%s://%s", scheme, target)
|
|
}
|
|
|
|
resp, err := c.Get(target)
|
|
if err != nil {
|
|
http.Error(w, "Internal server error", http.StatusInternalServerError)
|
|
}
|
|
defer resp.Body.Close()
|
|
w.Header().Set("Content-Type", "text/plain; version=0.0.4")
|
|
body, _ := ioutil.ReadAll(resp.Body)
|
|
fmt.Fprintf(w, "%s", body)
|
|
})
|
|
}
|
|
|
|
func shuffleEndpoints(r *rand.Rand, eps []string) []string {
|
|
// copied from Go 1.9<= rand.Rand.Perm
|
|
n := len(eps)
|
|
p := make([]int, n)
|
|
for i := 0; i < n; i++ {
|
|
j := r.Intn(i + 1)
|
|
p[i] = p[j]
|
|
p[j] = i
|
|
}
|
|
neps := make([]string, n)
|
|
for i, k := range p {
|
|
neps[i] = eps[k]
|
|
}
|
|
return neps
|
|
}
|