-
Notifications
You must be signed in to change notification settings - Fork 0
/
socket_server.go
283 lines (246 loc) · 6.73 KB
/
socket_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
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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
package server
import (
"bufio"
"context"
"fmt"
"io"
"net"
"runtime"
"github.com/daotl/go-log/v2"
gnet "github.com/daotl/guts/net"
ssrv "github.com/daotl/guts/service/suture"
gsync "github.com/daotl/guts/sync"
"github.com/daotl/go-acei/types"
)
// var maxNumberConnections = 2
type SocketServer struct {
*ssrv.BaseService
proto string
addr string
listener net.Listener
connsMtx gsync.Mutex
conns map[int]net.Conn
nextConnID int
appMtx gsync.Mutex
app types.Application
}
func NewSocketServer(logger log.StandardLogger, protoAddr string, app types.Application,
) (ssrv.Service, error) {
proto, addr := gnet.ProtocolAndAddress(protoAddr)
s := &SocketServer{
proto: proto,
addr: addr,
app: app,
}
var err error
s.BaseService, err = ssrv.NewBaseService(s.run, logger)
if err != nil {
return nil, err
}
return s, nil
}
//func (s *SocketServer) OnStart(ctx context.Context) error {
func (s *SocketServer) run(ctx context.Context, ready func(error)) error {
// Reset
s.listener = nil
s.conns = make(map[int]net.Conn)
ln, err := net.Listen(s.proto, s.addr)
if err != nil {
ready(err)
return err
}
s.listener = ln
go s.acceptConnectionsRoutine(ctx)
ready(nil)
// Block until stopped
<-ctx.Done()
//func (s *SocketServer) OnStop() {
if err := s.listener.Close(); err != nil {
s.Logger.Error("Error closing listener", "err", err)
}
s.connsMtx.Lock()
defer s.connsMtx.Unlock()
for id, conn := range s.conns {
delete(s.conns, id)
if err := conn.Close(); err != nil {
s.Logger.Error("Error closing connection", "id", id, "conn", conn, "err", err)
}
}
return nil
}
func (s *SocketServer) addConn(conn net.Conn) int {
s.connsMtx.Lock()
defer s.connsMtx.Unlock()
connID := s.nextConnID
s.nextConnID++
s.conns[connID] = conn
return connID
}
// deletes conn even if close errs
func (s *SocketServer) rmConn(connID int) error {
s.connsMtx.Lock()
defer s.connsMtx.Unlock()
conn, ok := s.conns[connID]
if !ok {
return fmt.Errorf("connection %d does not exist", connID)
}
delete(s.conns, connID)
return conn.Close()
}
func (s *SocketServer) acceptConnectionsRoutine(ctx context.Context) {
for {
if ctx.Err() != nil {
return
}
// Accept a connection
s.Logger.Info("Waiting for new connection...")
conn, err := s.listener.Accept()
if err != nil {
select {
case <-ctx.Done():
return // Ignore error from listener closing.
default:
}
s.Logger.Error("Failed to accept connection", "err", err)
continue
}
s.Logger.Info("Accepted a new connection")
connID := s.addConn(conn)
closeConn := make(chan error, 2) // Push to signal connection closed
responses := make(chan *types.Response, 1000) // A channel to buffer responses
// Read requests from conn and deal with them
go s.handleRequests(ctx, closeConn, conn, responses)
// Pull responses from 'responses' and write them to conn.
go s.handleResponses(ctx, closeConn, conn, responses)
// Wait until signal to close connection
go s.waitForClose(ctx, closeConn, connID)
}
}
func (s *SocketServer) waitForClose(ctx context.Context, closeConn chan error, connID int) {
defer func() {
// Close the connection
if err := s.rmConn(connID); err != nil {
s.Logger.Error("Error closing connection", "err", err)
}
}()
select {
case <-ctx.Done():
return
case err := <-closeConn:
switch {
case err == io.EOF:
s.Logger.Error("Connection was closed by client")
case err != nil:
s.Logger.Error("Connection error", "err", err)
default:
// never happens
s.Logger.Error("Connection was closed")
}
}
}
// Read requests from conn and deal with them
func (s *SocketServer) handleRequests(
ctx context.Context,
closeConn chan error,
conn io.Reader,
responses chan<- *types.Response,
) {
var count int
var bufReader = bufio.NewReader(conn)
defer func() {
// make sure to recover from any app-related panics to allow proper socket cleanup
r := recover()
if r != nil {
const size = 64 << 10
buf := make([]byte, size)
buf = buf[:runtime.Stack(buf, false)]
err := fmt.Errorf("recovered from panic: %v\n%s", r, buf)
closeConn <- err
s.appMtx.Unlock()
}
}()
for {
if ctx.Err() != nil {
return
}
var req = &types.Request{}
err := types.ReadMessage(bufReader, req)
if err != nil {
if err == io.EOF {
closeConn <- err
} else {
closeConn <- fmt.Errorf("error reading message: %w", err)
}
return
}
s.appMtx.Lock()
count++
s.handleRequest(req, responses)
s.appMtx.Unlock()
}
}
func (s *SocketServer) handleRequest(req *types.Request, responses chan<- *types.Response) {
switch r := req.Value.(type) {
case *types.Request_Echo:
responses <- types.ToResponseEcho(r.Echo.Message)
case *types.Request_Flush:
responses <- types.ToResponseFlush()
case *types.Request_Info:
res := s.app.Info(*r.Info)
responses <- types.ToResponseInfo(res)
case *types.Request_DeliverTx:
res := s.app.DeliverTx(*r.DeliverTx)
responses <- types.ToResponseDeliverTx(res)
case *types.Request_CheckTx:
res := s.app.CheckTx(*r.CheckTx)
responses <- types.ToResponseCheckTx(res)
case *types.Request_Commit:
res := s.app.Commit()
responses <- types.ToResponseCommit(res)
case *types.Request_Query:
res := s.app.Query(*r.Query)
responses <- types.ToResponseQuery(res)
case *types.Request_InitLedger:
res := s.app.InitLedger(*r.InitLedger)
responses <- types.ToResponseInitLedger(res)
case *types.Request_BeginBlock:
res := s.app.BeginBlock(*r.BeginBlock)
responses <- types.ToResponseBeginBlock(res)
case *types.Request_EndBlock:
res := s.app.EndBlock(*r.EndBlock)
responses <- types.ToResponseEndBlock(res)
case *types.Request_ListSnapshots:
res := s.app.ListSnapshots(*r.ListSnapshots)
responses <- types.ToResponseListSnapshots(res)
case *types.Request_OfferSnapshot:
res := s.app.OfferSnapshot(*r.OfferSnapshot)
responses <- types.ToResponseOfferSnapshot(res)
case *types.Request_LoadSnapshotChunk:
res := s.app.LoadSnapshotChunk(*r.LoadSnapshotChunk)
responses <- types.ToResponseLoadSnapshotChunk(res)
case *types.Request_ApplySnapshotChunk:
res := s.app.ApplySnapshotChunk(*r.ApplySnapshotChunk)
responses <- types.ToResponseApplySnapshotChunk(res)
default:
responses <- types.ToResponseException("Unknown request")
}
}
// Pull responses from 'responses' and write them to conn.
func (s *SocketServer) handleResponses(
ctx context.Context,
closeConn chan error,
conn io.Writer,
responses <-chan *types.Response,
) {
bw := bufio.NewWriter(conn)
for res := range responses {
if err := types.WriteMessage(res, bw); err != nil {
closeConn <- fmt.Errorf("error writing message: %w", err)
return
}
if err := bw.Flush(); err != nil {
closeConn <- fmt.Errorf("error flushing write buffer: %w", err)
return
}
}
}