-
Notifications
You must be signed in to change notification settings - Fork 791
/
input.go
216 lines (186 loc) · 5.36 KB
/
input.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
package nanomsg
import (
"context"
"errors"
"fmt"
"strings"
"sync"
"time"
"go.nanomsg.org/mangos/v3"
"go.nanomsg.org/mangos/v3/protocol/pub"
"go.nanomsg.org/mangos/v3/protocol/pull"
"go.nanomsg.org/mangos/v3/protocol/push"
"go.nanomsg.org/mangos/v3/protocol/sub"
"github.com/benthosdev/benthos/v4/internal/bundle"
"github.com/benthosdev/benthos/v4/internal/component"
"github.com/benthosdev/benthos/v4/internal/component/input"
"github.com/benthosdev/benthos/v4/internal/component/input/processors"
"github.com/benthosdev/benthos/v4/internal/docs"
"github.com/benthosdev/benthos/v4/internal/log"
"github.com/benthosdev/benthos/v4/internal/message"
// Import all transport types
_ "go.nanomsg.org/mangos/v3/transport/all"
)
func init() {
err := bundle.AllInputs.Add(processors.WrapConstructor(newNanomsgInput), docs.ComponentSpec{
Name: "nanomsg",
Summary: `Consumes messages via Nanomsg sockets (scalability protocols).`,
Description: `Currently only PULL and SUB sockets are supported.`,
Config: docs.FieldComponent().WithChildren(
docs.FieldString("urls", "A list of URLs to connect to (or as). If an item of the list contains commas it will be expanded into multiple URLs.").Array(),
docs.FieldBool("bind", "Whether the URLs provided should be connected to, or bound as."),
docs.FieldString("socket_type", "The socket type to use.").HasOptions("PULL", "SUB"),
docs.FieldString("sub_filters", "A list of subscription topic filters to use when consuming from a SUB socket. Specifying a single sub_filter of `''` will subscribe to everything.").Array(),
docs.FieldString("poll_timeout", "The period to wait until a poll is abandoned and reattempted.").Advanced(),
).ChildDefaultAndTypesFromStruct(input.NewNanomsgConfig()),
Categories: []string{
"Network",
},
})
if err != nil {
panic(err)
}
}
func newNanomsgInput(conf input.Config, mgr bundle.NewManagement) (input.Streamed, error) {
s, err := newNanomsgReader(conf.Nanomsg, mgr.Logger())
if err != nil {
return nil, err
}
return input.NewAsyncReader("nanomsg", true, input.NewAsyncPreserver(s), mgr)
}
type nanomsgReader struct {
socket mangos.Socket
cMut sync.Mutex
pollTimeout time.Duration
repTimeout time.Duration
urls []string
conf input.NanomsgConfig
log log.Modular
}
func newNanomsgReader(conf input.NanomsgConfig, log log.Modular) (*nanomsgReader, error) {
s := nanomsgReader{
conf: conf,
log: log,
repTimeout: time.Second * 5,
}
for _, u := range conf.URLs {
for _, splitU := range strings.Split(u, ",") {
if len(splitU) > 0 {
s.urls = append(s.urls, strings.Replace(splitU, "//*:", "//0.0.0.0:", 1))
}
}
}
if conf.SocketType == "SUB" && len(conf.SubFilters) == 0 {
return nil, errors.New("must provide at least one sub filter when connecting with a SUB socket, in order to subscribe to all messages add an empty string")
}
if tout := conf.PollTimeout; len(tout) > 0 {
var err error
if s.pollTimeout, err = time.ParseDuration(tout); err != nil {
return nil, fmt.Errorf("failed to parse poll timeout string: %v", err)
}
}
return &s, nil
}
func getSocketFromType(t string) (mangos.Socket, error) {
switch t {
case "PULL":
return pull.NewSocket()
case "SUB":
return sub.NewSocket()
case "PUSH":
return push.NewSocket()
case "PUB":
return pub.NewSocket()
}
return nil, errors.New("invalid Scalability Protocols socket type")
}
func (s *nanomsgReader) Connect(ctx context.Context) error {
s.cMut.Lock()
defer s.cMut.Unlock()
if s.socket != nil {
return nil
}
var socket mangos.Socket
var err error
defer func() {
if err != nil && socket != nil {
socket.Close()
}
}()
socket, err = getSocketFromType(s.conf.SocketType)
if err != nil {
return err
}
if s.conf.Bind {
for _, addr := range s.urls {
if err = socket.Listen(addr); err != nil {
break
}
}
} else {
for _, addr := range s.urls {
if err = socket.Dial(addr); err != nil {
break
}
}
}
if err != nil {
return err
}
// TODO: This is only used for request/response sockets, and is invalid with
// other socket types.
// err = socket.SetOption(mangos.OptionSendDeadline, s.pollTimeout)
// if err != nil {
// return err
// }
// Set timeout to prevent endless lock.
err = socket.SetOption(mangos.OptionRecvDeadline, s.repTimeout)
if err != nil {
return err
}
for _, filter := range s.conf.SubFilters {
if err := socket.SetOption(mangos.OptionSubscribe, []byte(filter)); err != nil {
return err
}
}
if s.conf.Bind {
s.log.Infof(
"Receiving Scalability Protocols messages at bound URLs: %s\n",
s.urls,
)
} else {
s.log.Infof(
"Receiving Scalability Protocols messages at connected URLs: %s\n",
s.urls,
)
}
s.socket = socket
return nil
}
func (s *nanomsgReader) ReadBatch(ctx context.Context) (message.Batch, input.AsyncAckFn, error) {
s.cMut.Lock()
socket := s.socket
s.cMut.Unlock()
if socket == nil {
return nil, nil, component.ErrNotConnected
}
data, err := socket.Recv()
if err != nil {
if err == mangos.ErrRecvTimeout {
return nil, nil, component.ErrTimeout
}
return nil, nil, err
}
return message.QuickBatch([][]byte{data}), func(ctx context.Context, err error) error {
return nil
}, nil
}
func (s *nanomsgReader) Close(ctx context.Context) (err error) {
s.cMut.Lock()
defer s.cMut.Unlock()
if s.socket != nil {
err = s.socket.Close()
s.socket = nil
}
return
}