-
Notifications
You must be signed in to change notification settings - Fork 1
/
gopipe.go
304 lines (254 loc) · 7.44 KB
/
gopipe.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
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
// Gopipe reads config, creates modules and channels and starts the whole pipeline...
//
// Given thet all modules are reusable, one can use the rest of the packages as
// library of components and write their own "main". This could accept different
// config formats, customize the logger, etc
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os"
"os/exec"
"os/signal"
"syscall"
"time"
log "github.com/sirupsen/logrus"
"github.com/urban-1/gopipe/core"
_ "github.com/urban-1/gopipe/input"
_ "github.com/urban-1/gopipe/output"
_ "github.com/urban-1/gopipe/proc"
"github.com/urfave/cli"
)
// Store our modules
var mods []core.Component
func init() {
customFormatter := new(log.TextFormatter)
customFormatter.FullTimestamp = true
log.SetFormatter(customFormatter)
}
// Given the configuration of a module, the channels and the registry, create and
// return an instance
func instanceFromConfig(cfg core.Config, ch1 chan *core.Event, ch2 chan *core.Event, reg core.Registry) (core.Component, error) {
moduleName, ok := cfg["module"].(string)
if !ok {
log.Error("Missing 'module' (module name) from configuration")
return nil, cli.NewExitError("Missing 'module' (module name) from configuration", -3)
}
log.Info("Loading ", moduleName)
modConstructor, ok := reg[moduleName]
if !ok {
log.Error("Unknown module '", moduleName, "'")
return nil, cli.NewExitError("Unknown module '"+moduleName+"'", -4)
}
log.Info("Loaded!")
return modConstructor(ch1, ch2, cfg), nil
}
// Loop for ever while sleeping for interval_seconds in every iteration
// and execut a command (discarding output)
func runTask(name string, parts []string, intervalSeconds uint64, signals []interface{}) {
cmd, args := parts[0], parts[1:]
for {
if err := exec.Command(cmd, args...).Run(); err != nil {
log.Error("Failed to run command '" + name + "': " + err.Error())
time.Sleep(time.Duration(intervalSeconds) * time.Second)
continue
}
log.Debug("Command '" + name + "' run successfully...")
// Signal other components
for _, signal := range signals {
mod := int(signal.(core.Config)["mod"].(float64))
sig := signal.(core.Config)["signal"].(string)
log.Infof("Invoking signal '%s' on component %d", sig, mod)
mods[mod].Signal(sig)
}
time.Sleep(time.Duration(intervalSeconds) * time.Second)
}
}
func apiStatus(w http.ResponseWriter, r *http.Request) {
var err error
log.Info("ACCESS ", r.URL.Path)
ret := map[string]interface{}{
"components": []interface{}{},
}
for _, mod := range mods {
ret["components"] = append(ret["components"].([]interface{}), mod.GetStatsJSON())
}
var content []byte
if content, err = json.Marshal(ret); err != nil {
log.Error("Failed to parse component stats to JSON")
}
fmt.Fprintf(w, "%s", string(content))
}
func main() {
app := cli.NewApp()
// app.Name = "gopipe"
app.Usage = "Pipeline processing in Go!"
app.Version = "0.0.1"
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "config, c",
Usage: "Load configuration from `FILE` (required)",
},
cli.BoolFlag{
Name: "debug, d",
Usage: "Enable debug mode",
},
}
app.Action = func(c *cli.Context) error {
if c.String("config") == "" {
const msg = "You need to provide config file..."
log.Error(msg)
return cli.NewExitError(msg, -1)
}
if c.Bool("debug") {
log.SetLevel(log.DebugLevel)
}
DN, _ := os.Getwd()
log.Info("Running from directory '", DN, "'")
log.Info("Loading configuration from '", c.String("config"), "'")
raw, err := ioutil.ReadFile(c.String("config"))
if err != nil {
log.Error(err.Error())
return cli.NewExitError(err.Error(), -2)
}
var CFG core.Config
if err := json.Unmarshal(raw, &CFG); err != nil {
log.Error(err.Error())
return cli.NewExitError(err.Error(), -2)
}
// Channel buffer size
tmpF64, ok := CFG["main"].(core.Config)["channel_size"].(float64)
if !ok {
log.Warn("No buffer length (channel_size) set in main section. Assuming 1")
tmpF64 = 1
} else {
log.Info("Using buffer length: ", tmpF64)
}
QLEN := int(tmpF64)
// Printing frequency
tmpF64, ok = CFG["main"].(core.Config)["stats_every"].(float64)
if ok {
core.STATS_EVERY = uint64(tmpF64)
}
// Load registry
reg := core.GetRegistryInstance()
// In module
in, ok := CFG["in"].(core.Config)
if !ok {
log.Error("You need to define 'in' section in your config")
return cli.NewExitError("You need to define 'in' section in your config", -2)
}
// Store all channels
var chans []chan *core.Event
// Create the first Q (ouput)
tmpch := make(chan *core.Event, QLEN)
chans = append(chans, tmpch)
// Append in module
tmp, err := instanceFromConfig(in, nil, tmpch, reg)
if err != nil {
return err
}
mods = append(mods, tmp)
proc, ok := CFG["proc"].([]interface{})
for index, cfg := range proc {
// Create a new one for every output
chans = append(chans, make(chan *core.Event, QLEN))
log.Info("Loading processor module ", index)
tmp, err = instanceFromConfig(
cfg.(core.Config),
chans[len(chans)-2],
chans[len(chans)-1],
reg)
if err != nil {
return err
}
mods = append(mods, tmp)
}
// Output module
out, ok := CFG["out"].(core.Config)
if !ok {
log.Error("You need to define 'out' section in your config")
return cli.NewExitError("You need to define 'out' section out your config", -2)
}
tmp, err = instanceFromConfig(out, chans[len(chans)-1], nil, reg)
if err != nil {
return err
}
mods = append(mods, tmp)
log.Info("Created ", len(chans), " channels")
// Start the HTTP server
tmpport, ok := CFG["main"].(core.Config)["apiport"].(float64)
var apiport string
if !ok {
apiport = "9090"
} else {
apiport = fmt.Sprintf("%v", tmpport)
}
http.HandleFunc("/status", apiStatus) // set router
go func() error {
err = http.ListenAndServe(":"+apiport, nil) // set listen port
if err != nil {
log.Error("Failed to bind TCP port for API server")
log.Fatal("ListenAndServe: ", err)
return err
}
return nil
}()
// Spawn all tasks before starting processing
tasks, ok := CFG["tasks"].([]interface{})
for _, task := range tasks {
go runTask(
task.(core.Config)["name"].(string),
core.InterfaceToStringArray(task.(core.Config)["command"].([]interface{})),
uint64(task.(core.Config)["interval_seconds"].(float64)),
task.(core.Config)["signals"].([]interface{}))
}
// Start all
for _, mod := range mods {
go mod.Run()
}
chExit := make(chan os.Signal, 1)
chInst := make(chan os.Signal, 1)
signal.Notify(chExit, syscall.SIGINT, syscall.SIGTERM, syscall.SIGKILL)
signal.Notify(chInst, syscall.SIGUSR1, syscall.SIGUSR1)
// Now loop forever
run := true
for run {
select {
case <-chExit:
log.Info("gopipe stoping components...")
// Kill the input
mods[0].Stop()
log.Info("gopipe waiting for queues to empty...")
for i, c := range chans {
for len(c) > 0 {
log.Info("Waiting on channel", i, " len=", len(c))
time.Sleep(time.Duration(1000) * time.Millisecond)
}
}
for _, mod := range mods {
mod.Stop()
}
log.Info("gopipe exiting...")
run = false
break
case sig := <-chInst:
switch sig {
case syscall.SIGUSR1:
for _, mod := range mods {
mod.MustPrintStats()
}
case syscall.SIGUSR2:
//handle SIGTERM
}
default:
time.Sleep(time.Duration(1000) * time.Millisecond)
// log.Warn("All Channels Empty")
}
}
return nil
}
app.Run(os.Args)
}