-
Notifications
You must be signed in to change notification settings - Fork 81
/
server.go
149 lines (125 loc) · 4.36 KB
/
server.go
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
// Copyright (c) 2015 Uber Technologies, Inc.
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package main
import (
"fmt"
"log"
"os"
"sync"
"unicode"
"unicode/utf8"
"github.com/uber/tchannel-go"
"github.com/uber/tchannel-go/examples/keyvalue/gen-go/keyvalue"
"github.com/uber/tchannel-go/hyperbahn"
"github.com/uber/tchannel-go/pprof"
"github.com/uber/tchannel-go/thrift"
)
func main() {
// Create a TChannel and register the Thrift handlers.
ch, err := tchannel.NewChannel("keyvalue", nil)
if err != nil {
log.Fatalf("Failed to create tchannel: %v", err)
}
// Register both the KeyValue and Admin services.
// We can register multiple Thrift services on a single Hyperbahn service.
h := newKVHandler()
server := thrift.NewServer(ch)
server.Register(keyvalue.NewTChanKeyValueServer(h))
server.Register(keyvalue.NewTChanAdminServer(h))
pprof.Register(ch)
// Listen for connections on the external interface so we can receive connections.
ip, err := tchannel.ListenIP()
if err != nil {
log.Fatalf("Failed to find IP to Listen on: %v", err)
}
// We use port 0 which asks the OS to assign any available port.
// Static port allocations are not necessary for services on Hyperbahn.
ch.ListenAndServe(fmt.Sprintf("%v:%v", ip, 0))
// Advertising registers this service instance with Hyperbahn so
// that Hyperbahn can route requests for "keyvalue" to us.
config := hyperbahn.Configuration{InitialNodes: os.Args[1:]}
if len(config.InitialNodes) > 0 {
client, err := hyperbahn.NewClient(ch, config, nil)
if err != nil {
log.Fatalf("hyperbahn.NewClient failed: %v", err)
}
if err := client.Advertise(); err != nil {
log.Fatalf("Hyperbahn advertise failed: %v", err)
}
}
// The service is now started up, run it till we receive a ctrl-c.
log.Printf("KeyValue service has started on %v", ch.PeerInfo().HostPort)
select {}
}
type kvHandler struct {
sync.RWMutex
vals map[string]string
}
// NewKVHandler returns a new handler for the KeyValue service.
func newKVHandler() *kvHandler {
return &kvHandler{vals: make(map[string]string)}
}
// Get returns the value stored for the given key.
func (h *kvHandler) Get(ctx thrift.Context, key string) (string, error) {
if err := isValidKey(key); err != nil {
return "", err
}
h.RLock()
defer h.RUnlock()
if val, ok := h.vals[key]; ok {
return val, nil
}
return "", &keyvalue.KeyNotFound{Key: key}
}
// Set sets the value for a given key.
func (h *kvHandler) Set(ctx thrift.Context, key, value string) error {
if err := isValidKey(key); err != nil {
return err
}
h.Lock()
defer h.Unlock()
h.vals[key] = value
// Example of how to use response headers. Normally, these values should be passed via result structs.
ctx.SetResponseHeaders(map[string]string{"count": fmt.Sprint(len(h.vals))})
return nil
}
// HealthCheck return the health status of this process.
func (h *kvHandler) HealthCheck(ctx thrift.Context) (string, error) {
return "OK", nil
}
// ClearAll clears all the keys.
func (h *kvHandler) ClearAll(ctx thrift.Context) error {
if !isAdmin(ctx) {
return &keyvalue.NotAuthorized{}
}
h.Lock()
defer h.Unlock()
h.vals = make(map[string]string)
return nil
}
func isValidKey(key string) error {
r, _ := utf8.DecodeRuneInString(key)
if !unicode.IsLetter(r) {
return &keyvalue.InvalidKey{}
}
return nil
}
func isAdmin(ctx thrift.Context) bool {
return ctx.Headers()["user"] == "admin"
}