forked from filecoin-project/go-jsonrpc
-
Notifications
You must be signed in to change notification settings - Fork 0
/
server.go
141 lines (117 loc) · 2.92 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
package jsonrpc
import (
"context"
"encoding/json"
"io"
"net/http"
"strings"
"time"
"golang.org/x/xerrors"
"github.com/gorilla/websocket"
)
// RPCServer provides a jsonrpc 2.0 http server handler
type RPCServer struct {
*handler
reverseClientBuilder func(context.Context, *wsConn) (context.Context, error)
timeout time.Duration
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,
timeout: config.timeout,
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.Error(err)
w.WriteHeader(500)
return
}
wc := &wsConn{
conn: c,
handler: s,
exiting: make(chan struct{}),
timeout: s.timeout,
pingInterval: s.pingInterval,
}
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
}
}
wc.handleWsConn(ctx)
if err := c.Close(); err != nil {
log.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, err error) {
log.Errorf("RPC Error: %s", err)
wf(func(w io.Writer) {
if hw, ok := w.(http.ResponseWriter); ok {
hw.WriteHeader(500)
}
log.Warnf("rpc error: %s", err)
if req.ID == nil { // notification
return
}
var code ErrorCode
_ = xerrors.As(err, &code)
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{}