-
Notifications
You must be signed in to change notification settings - Fork 0
/
gateway.go
179 lines (152 loc) · 5.15 KB
/
gateway.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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
// Copyright (c) 2017 Johan Brandhorst
// 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 grpcweb
import (
"errors"
"time"
"github.com/gopherjs/gopherjs/js"
// Include gRPC-web JS objects
_ "github.com/johanbrandhorst/gopherjs-grpc-web/grpcwebjs"
)
// GatewayClientBase represents the gRPC-web
// GatewayClientBase class.
type GatewayClientBase struct {
*js.Object
}
// NewGatewayClientBase constructs a new GatewayClientBase
// from the JS class constructor.
func NewGatewayClientBase() *GatewayClientBase {
return &GatewayClientBase{
Object: js.Global.Get("grpc").Get("web").Get("GatewayClientBase").New(),
}
}
// RPCCall makes an XHR request to the provided endpoint using the provided
// request. It returns a byte representation of the response, or an error
func (g *GatewayClientBase) RPCCall(endpoint string, request ProtoMessage, opts ...CallOption) (resp []byte, err error) {
xhr := NewXHRIO()
stream := NewXHRNodeReadableStream(xhr)
for _, opt := range opts {
opt(stream)
}
respChan := make(chan []byte, 1)
errChan := make(chan error, 1)
stream.On(DATA, func(obj *js.Object) {
println("Got data!")
if obj.Get("1").Length() > 0 {
respChan <- js.Global.Get("Uint8Array").New(obj.Get("1")).Interface().([]byte)
}
if obj.Get("2").Length() > 0 {
status, err := g.ParseRPCStatus(js.Global.Get("Uint8Array").New(obj.Get("2")).Interface().([]byte))
if err != nil {
errChan <- err
} else if status.Code != Ok {
errChan <- errors.New("Error code: " + string(status.Code) + `, "` + status.Details + `"`)
}
}
})
stream.On(ERROR, func(_ *js.Object) {
println("Got error!")
errChan <- errors.New("some error")
})
stream.On(CLOSE, func(_ *js.Object) {
println("Got CLOSE!")
errChan <- errors.New("some CLOSE")
})
stream.On(END, func(_ *js.Object) {
println("Got end!")
errChan <- errors.New("some end")
})
stream.On(READABLE, func(_ *js.Object) {
println("Got READABLE!")
errChan <- errors.New("some READABLE")
})
xhr.SetRequestHeader("Content-Type", "application/x-protobuf")
xhr.SetRequestHeader("X-Accept-Content-Transfer-Encoding", "base64")
xhr.SetRequestHeader("X-Accept-Response-Streaming", "true")
xhr.SetTimeout(time.Second)
reqData, err := request.Serialize()
if err != nil {
return nil, err
}
xhr.Send(endpoint, POST, reqData)
// Block until we've received a reply
select {
case resp = <-respChan:
println("Got resp!")
return resp, nil
case err = <-errChan:
println("Got err!")
return nil, err
}
}
// ServerStreaming makes an XHR request to the provided streaming endpoint
// using the provided request. It returns client for reading messages.
func (g *GatewayClientBase) ServerStreaming(endpoint string, request ProtoMessage, opts ...CallOption) (*StreamReader, error) {
xhr := NewXHRIO()
stream := NewXHRNodeReadableStream(xhr)
for _, opt := range opts {
opt(stream)
}
respChan := make(chan []byte, 1)
errChan := make(chan error, 1)
stream.On("data", func(obj *js.Object) {
if obj.Get("1").Length() > 0 {
respChan <- js.Global.Get("Uint8Array").New(obj.Get("1")).Interface().([]byte)
}
if obj.Get("2").Length() > 0 {
status, err := g.ParseRPCStatus(js.Global.Get("Uint8Array").New(obj.Get("2")).Interface().([]byte))
if err != nil {
errChan <- err
return
}
if status.Code != Ok {
errChan <- &Error{Code: status.Code, Message: status.Details}
} else {
// Success!
errChan <- EOF
}
}
})
xhr.SetRequestHeader("Content-Type", "application/x-protobuf")
xhr.SetRequestHeader("X-Accept-Content-Transfer-Encoding", "base64")
xhr.SetRequestHeader("X-Accept-Response-Streaming", "true")
reqData, err := request.Serialize()
if err != nil {
return nil, err
}
xhr.Send(endpoint, POST, reqData)
return NewStreamReader(respChan, errChan), nil
}
// ParseRPCStatus parses raw bytes to a Status.
func (g *GatewayClientBase) ParseRPCStatus(rawBytes []byte) (s *Status, err error) {
// Recover any thrown JS errors
defer func() {
e := recover()
if e == nil {
return
}
if e, ok := e.(*js.Error); ok {
err = e
} else {
panic(e)
}
}()
s = &Status{
Object: g.Call("parseRpcStatus_", js.Global.Get("Uint8Array").New(rawBytes)),
}
return s, err
}