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
153
154
155
156
|
// Copyright 2015 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 etcdhttp
import (
"encoding/json"
"expvar"
"fmt"
"net/http"
"go.etcd.io/etcd/api/v3/version"
"go.etcd.io/etcd/server/v3/etcdserver"
"go.etcd.io/etcd/server/v3/etcdserver/api"
"go.etcd.io/etcd/server/v3/etcdserver/api/v2error"
"go.etcd.io/etcd/server/v3/etcdserver/api/v2http/httptypes"
"go.uber.org/zap"
)
const (
configPath = "/config"
varsPath = "/debug/vars"
versionPath = "/version"
)
// HandleBasic adds handlers to a mux for serving JSON etcd client requests
// that do not access the v2 store.
func HandleBasic(lg *zap.Logger, mux *http.ServeMux, server etcdserver.ServerPeer) {
mux.HandleFunc(varsPath, serveVars)
mux.HandleFunc(versionPath, versionHandler(server.Cluster(), serveVersion))
}
func versionHandler(c api.Cluster, fn func(http.ResponseWriter, *http.Request, string)) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
v := c.Version()
if v != nil {
fn(w, r, v.String())
} else {
fn(w, r, "not_decided")
}
}
}
func serveVersion(w http.ResponseWriter, r *http.Request, clusterV string) {
if !allowMethod(w, r, "GET") {
return
}
vs := version.Versions{
Server: version.Version,
Cluster: clusterV,
}
w.Header().Set("Content-Type", "application/json")
b, err := json.Marshal(&vs)
if err != nil {
panic(fmt.Sprintf("cannot marshal versions to json (%v)", err))
}
w.Write(b)
}
func serveVars(w http.ResponseWriter, r *http.Request) {
if !allowMethod(w, r, "GET") {
return
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
fmt.Fprintf(w, "{\n")
first := true
expvar.Do(func(kv expvar.KeyValue) {
if !first {
fmt.Fprintf(w, ",\n")
}
first = false
fmt.Fprintf(w, "%q: %s", kv.Key, kv.Value)
})
fmt.Fprintf(w, "\n}\n")
}
func allowMethod(w http.ResponseWriter, r *http.Request, m string) bool {
if m == r.Method {
return true
}
w.Header().Set("Allow", m)
http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
return false
}
// WriteError logs and writes the given Error to the ResponseWriter
// If Error is an etcdErr, it is rendered to the ResponseWriter
// Otherwise, it is assumed to be a StatusInternalServerError
func WriteError(lg *zap.Logger, w http.ResponseWriter, r *http.Request, err error) {
if err == nil {
return
}
switch e := err.(type) {
case *v2error.Error:
e.WriteTo(w)
case *httptypes.HTTPError:
if et := e.WriteTo(w); et != nil {
if lg != nil {
lg.Debug(
"failed to write v2 HTTP error",
zap.String("remote-addr", r.RemoteAddr),
zap.String("internal-server-error", e.Error()),
zap.Error(et),
)
}
}
default:
switch err {
case etcdserver.ErrTimeoutDueToLeaderFail, etcdserver.ErrTimeoutDueToConnectionLost, etcdserver.ErrNotEnoughStartedMembers,
etcdserver.ErrUnhealthy:
if lg != nil {
lg.Warn(
"v2 response error",
zap.String("remote-addr", r.RemoteAddr),
zap.String("internal-server-error", err.Error()),
)
}
default:
if lg != nil {
lg.Warn(
"unexpected v2 response error",
zap.String("remote-addr", r.RemoteAddr),
zap.String("internal-server-error", err.Error()),
)
}
}
herr := httptypes.NewHTTPError(http.StatusInternalServerError, "Internal Server Error")
if et := herr.WriteTo(w); et != nil {
if lg != nil {
lg.Debug(
"failed to write v2 HTTP error",
zap.String("remote-addr", r.RemoteAddr),
zap.String("internal-server-error", err.Error()),
zap.Error(et),
)
}
}
}
}
|
