-
Notifications
You must be signed in to change notification settings - Fork 88
/
server.go
152 lines (126 loc) · 3.27 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
150
151
152
package jsonrpc
import (
"context"
"encoding/json"
"io"
"net/http"
"runtime/pprof"
"strings"
"time"
"github.com/google/uuid"
"github.com/gorilla/websocket"
)
const (
rpcParseError = -32700
rpcInvalidRequest = -32600
rpcMethodNotFound = -32601
rpcInvalidParams = -32602
)
// RPCServer provides a jsonrpc 2.0 http server handler
type RPCServer struct {
*handler
reverseClientBuilder func(context.Context, *wsConn) (context.Context, error)
pingInterval time.Duration
}
// NewServer creates new RPCServer instance
func NewServer(opts ...ServerOption) *RPCServer {
config := defaultServerConfig()
for _, o := range opts {
o(&config)
}
return &RPCServer{
handler: makeHandler(config),
reverseClientBuilder: config.reverseClientBuilder,
pingInterval: config.pingInterval,
}
}
var upgrader = websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool {
return true
},
}
func (s *RPCServer) handleWS(ctx context.Context, w http.ResponseWriter, r *http.Request) {
// TODO: allow setting
// (note that we still are mostly covered by jwt tokens)
w.Header().Set("Access-Control-Allow-Origin", "*")
if r.Header.Get("Sec-WebSocket-Protocol") != "" {
w.Header().Set("Sec-WebSocket-Protocol", r.Header.Get("Sec-WebSocket-Protocol"))
}
c, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Errorw("upgrading connection", "error", err)
// note that upgrader.Upgrade will set http error if there is an error
return
}
wc := &wsConn{
conn: c,
handler: s,
pingInterval: s.pingInterval,
exiting: make(chan struct{}),
}
if s.reverseClientBuilder != nil {
ctx, err = s.reverseClientBuilder(ctx, wc)
if err != nil {
log.Errorf("failed to build reverse client: %s", err)
w.WriteHeader(500)
return
}
}
lbl := pprof.Labels("jrpc-mode", "wsserver", "jrpc-remote", r.RemoteAddr, "jrpc-uuid", uuid.New().String())
pprof.Do(ctx, lbl, func(ctx context.Context) {
wc.handleWsConn(ctx)
})
if err := c.Close(); err != nil {
log.Errorw("closing websocket connection", "error", err)
return
}
}
// TODO: return errors to clients per spec
func (s *RPCServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
h := strings.ToLower(r.Header.Get("Connection"))
if strings.Contains(h, "upgrade") {
s.handleWS(ctx, w, r)
return
}
s.handleReader(ctx, r.Body, w, rpcError)
}
func rpcError(wf func(func(io.Writer)), req *request, code ErrorCode, err error) {
log.Errorf("RPC Error: %s", err)
wf(func(w io.Writer) {
if hw, ok := w.(http.ResponseWriter); ok {
if code == rpcInvalidRequest {
hw.WriteHeader(400)
} else {
hw.WriteHeader(500)
}
}
log.Warnf("rpc error: %s", err)
if req == nil {
req = &request{}
}
resp := response{
Jsonrpc: "2.0",
ID: req.ID,
Error: &respError{
Code: code,
Message: err.Error(),
},
}
err = json.NewEncoder(w).Encode(resp)
if err != nil {
log.Warnf("failed to write rpc error: %s", err)
return
}
})
}
// Register registers new RPC handler
//
// Handler is any value with methods defined
func (s *RPCServer) Register(namespace string, handler interface{}) {
s.register(namespace, handler)
}
func (s *RPCServer) AliasMethod(alias, original string) {
s.aliasedMethods[alias] = original
}
var _ error = &respError{}