mirror of
https://github.com/etcd-io/etcd.git
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f5d7f997d6
Add two separate probes, one for liveness and one for readiness. The liveness probe would check that the local individual node is up and running, or else restart the node, while the readiness probe would check that the cluster is ready to serve traffic. This would make etcd health-check fully Kubernetes API complient. Signed-off-by: Siyuan Zhang <sizhang@google.com>
81 lines
2.3 KiB
Go
81 lines
2.3 KiB
Go
// Copyright 2017 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package grpcproxy
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import (
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"context"
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"fmt"
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"net/http"
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"time"
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"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
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"go.etcd.io/etcd/client/v3"
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"go.etcd.io/etcd/server/v3/etcdserver/api/etcdhttp"
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"go.uber.org/zap"
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)
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// HandleHealth registers health handler on '/health'.
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func HandleHealth(lg *zap.Logger, mux *http.ServeMux, c *clientv3.Client) {
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if lg == nil {
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lg = zap.NewNop()
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}
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mux.Handle(etcdhttp.PathHealth, etcdhttp.NewHealthHandler(lg, func(ctx context.Context, excludedAlarms etcdhttp.StringSet, serializable bool) etcdhttp.Health {
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return checkHealth(c)
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}))
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}
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// HandleProxyHealth registers health handler on '/proxy/health'.
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func HandleProxyHealth(lg *zap.Logger, mux *http.ServeMux, c *clientv3.Client) {
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if lg == nil {
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lg = zap.NewNop()
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}
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mux.Handle(etcdhttp.PathProxyHealth, etcdhttp.NewHealthHandler(lg, func(ctx context.Context, excludedAlarms etcdhttp.StringSet, serializable bool) etcdhttp.Health {
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return checkProxyHealth(c)
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}))
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}
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func checkHealth(c *clientv3.Client) etcdhttp.Health {
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h := etcdhttp.Health{Health: "false"}
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ctx, cancel := context.WithTimeout(c.Ctx(), time.Second)
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_, err := c.Get(ctx, "a")
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cancel()
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if err == nil || err == rpctypes.ErrPermissionDenied {
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h.Health = "true"
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} else {
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h.Reason = fmt.Sprintf("GET ERROR:%s", err)
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}
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return h
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}
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func checkProxyHealth(c *clientv3.Client) etcdhttp.Health {
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if c == nil {
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return etcdhttp.Health{Health: "false", Reason: "no connection to proxy"}
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}
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h := checkHealth(c)
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if h.Health != "true" {
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return h
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}
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ctx, cancel := context.WithTimeout(c.Ctx(), time.Second*3)
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ch := c.Watch(ctx, "a", clientv3.WithCreatedNotify())
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select {
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case <-ch:
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case <-ctx.Done():
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h.Health = "false"
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h.Reason = "WATCH TIMEOUT"
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}
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cancel()
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return h
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}
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