forked from lukasmalkmus/faktory_exporter
-
Notifications
You must be signed in to change notification settings - Fork 0
/
faktory_exporter.go
392 lines (349 loc) · 10.8 KB
/
faktory_exporter.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
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
package main
import (
"context"
"encoding/json"
"fmt"
"net/http"
"net/url"
"os"
"os/signal"
"sync"
"syscall"
"time"
faktory "github.com/contribsys/faktory/client"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/log"
"github.com/prometheus/common/version"
kingpin "gopkg.in/alecthomas/kingpin.v2"
)
const (
// namespace for all metrics of this exporter.
namespace = "faktory"
)
var (
faktoryURL = kingpin.Flag("faktory.url", "URL of the faktory instance").Default("tcp://localhost:7419").OverrideDefaultFromEnvar("FAKTORY_URL").String()
webListenAddress = kingpin.Flag("web.listen-address", "Address on which to expose metrics and web interface").Default(":9386").String()
webMetricsPath = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics").Default("/metrics").String()
)
// landingPage contains the HTML served at '/'.
var landingPage = `<html>
<head>
<title>Faktory Exporter</title>
</head>
<body>
<h1>Faktory Exporter</h1>
<p>
<a href=` + *webMetricsPath + `>Metrics</a>
</p>
</body>
</html>`
type Tasks struct {
retries Retries
}
type Retries struct {
cycles prometheus.Gauge
enqueued prometheus.Gauge
size prometheus.Gauge
}
// Exporter collects stats from a Faktory instance by issuing the "INFO" command
// and exports them using the prometheus client library.
type Exporter struct {
mutex sync.RWMutex
client *faktory.Client
// Basic exporter metrics.
up, scrapeDuration prometheus.Gauge
totalScrapes, failedScrapes prometheus.Counter
// Faktory metrics.
commandCount prometheus.Counter
connections prometheus.Gauge
jobs *prometheus.CounterVec
totalQueues prometheus.Gauge
tasks Tasks
queues *prometheus.GaugeVec
}
// New creates and returns a new, initialized Faktory Exporter.
func New(faktoryURL string) (*Exporter, error) {
// Parse provided URL.
uri, err := url.Parse(faktoryURL)
if err != nil {
return nil, err
}
// Create server struct and initialize it with info retrieved from
// parsed URL.
srv := faktory.DefaultServer()
srv.Network = uri.Scheme
srv.Address = fmt.Sprintf("%s:%s", uri.Hostname(), uri.Port())
pwd := ""
if uri.User != nil {
pwd, _ = uri.User.Password()
}
// Setup connection to Faktory instance.
client, err := faktory.Dial(srv, pwd)
if err != nil {
return nil, err
}
e := &Exporter{
// Faktory client.
client: client,
// Basic exporter metrics.
up: prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Name: "up",
Help: "Was the last scrape of the Faktory instance successful?",
}),
scrapeDuration: prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: "exporter",
Name: "scrape_duration_seconds",
Help: "Duration of the scrape of metrics from the Faktory instance.",
}),
totalScrapes: prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: "exporter",
Name: "scrapes_total",
Help: "Total Faktory scrapes.",
}),
failedScrapes: prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: "exporter",
Name: "scrape_failures_total",
Help: "Total amount of scrape failures.",
}),
// Faktory metrics.
commandCount: prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: "server",
Name: "command_count",
Help: "Number of commands which have been issued to the server.",
}),
connections: prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: "server",
Name: "connections",
Help: "Number of currently connected clients.",
}),
jobs: prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: "jobs",
Name: "total",
Help: "Total amount of jobs.",
}, []string{"status"}),
totalQueues: prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: "queues",
Name: "total",
Help: "Total amount of queues.",
}),
queues: prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: "queue",
Name: "jobs",
Help: "Number of jobs in every queue.",
}, []string{"queue"}),
tasks: Tasks{retries: Retries{
enqueued: prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: "tasks_retries",
Name: "enqueued",
Help: "Task retries enqueued.",
}),
size: prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: "tasks_retries",
Name: "size",
Help: "Task retries size.",
}),
}},
}
return e, nil
}
// Describe all the metrics collected by the Faktory exporter.
// Implements prometheus.Collector.
func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
e.up.Describe(ch)
e.scrapeDuration.Describe(ch)
e.failedScrapes.Describe(ch)
e.totalScrapes.Describe(ch)
e.commandCount.Describe(ch)
e.connections.Describe(ch)
e.jobs.Describe(ch)
e.tasks.retries.enqueued.Describe(ch)
e.tasks.retries.size.Describe(ch)
e.totalQueues.Describe(ch)
e.queues.Describe(ch)
}
// Collect the stats from the configured Faktory instance and deliver them as
// Prometheus metrics.
// Implements prometheus.Collector.
func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
// Protect metrics from concurrent collects.
e.mutex.Lock()
defer e.mutex.Unlock()
// Reset metrics.
e.reset()
// Scrape metrics from Faktory instance.
if err := e.scrape(); err != nil {
log.Error(err)
}
// Collect metrics.
e.up.Collect(ch)
e.scrapeDuration.Collect(ch)
e.failedScrapes.Collect(ch)
e.totalScrapes.Collect(ch)
e.commandCount.Collect(ch)
e.connections.Collect(ch)
e.jobs.Collect(ch)
e.tasks.retries.enqueued.Collect(ch)
e.tasks.retries.size.Collect(ch)
e.totalQueues.Collect(ch)
e.queues.Collect(ch)
}
// reset the vector metrics.
func (e *Exporter) reset() {
e.jobs.Reset()
}
// scrape issues the "INFO" command to the Faktory instance, fetches the
// appropriate metrics and meassures the scrapes duration.
func (e *Exporter) scrape() (err error) {
// Meassure scrape duration, increase total scrapes and evaluate if the
// scrape was successful and set up/down and failes scrapes accordingly.
defer func(begun time.Time) {
e.scrapeDuration.Set(time.Since(begun).Seconds())
e.totalScrapes.Inc()
if err != nil {
e.up.Set(0)
e.failedScrapes.Inc()
} else {
e.up.Set(1)
}
}(time.Now())
// Fetch info from configured Faktory instance.
info, err := e.client.Info()
if err != nil {
return err
}
b, _ := json.MarshalIndent(info, "", " ")
println(string(b))
// Get server stats.
server := info["server"].(map[string]interface{})
commandCount, ok := server["command_count"].(float64)
if !ok {
return fmt.Errorf("error getting command count")
}
connections, ok := server["connections"].(float64)
if !ok {
return fmt.Errorf("error getting connections")
}
// Get job and queue stats.
faktory := info["faktory"].(map[string]interface{})
enqueued, ok := faktory["total_enqueued"].(float64)
if !ok {
return fmt.Errorf("error getting enqueued jobs")
}
failures, ok := faktory["total_failures"].(float64)
if !ok {
return fmt.Errorf("error getting failed jobs")
}
processed, ok := faktory["total_processed"].(float64)
if !ok {
return fmt.Errorf("error getting processed jobs")
}
totalQueues, ok := faktory["total_queues"].(float64)
if !ok {
return fmt.Errorf("error getting queues")
}
tasks, ok := faktory["tasks"].(map[string]interface{})
if !ok {
return fmt.Errorf("error getting tasks")
}
retries, ok := tasks["Retries"].(map[string]interface{})
if !ok {
return fmt.Errorf("error getting retries")
}
// Set all metrics.
e.commandCount.Set(commandCount)
e.connections.Set(connections)
e.jobs.WithLabelValues("enqueued").Set(enqueued)
e.jobs.WithLabelValues("failure").Set(failures)
e.jobs.WithLabelValues("processed").Set(processed)
e.tasks.retries.enqueued.Set(retries["enqueued"].(float64))
e.tasks.retries.size.Set(retries["size"].(float64))
e.totalQueues.Set(totalQueues)
queues, ok := faktory["queues"].(map[string]interface{})
if !ok {
return fmt.Errorf("error getting queue counts")
}
for queue, jobs := range queues {
e.queues.WithLabelValues(queue).Set(jobs.(float64))
}
return nil
}
func main() {
os.Exit(Main())
}
// Main manages the complete application lifecycle, from startup to shutdown.
func Main() int {
log.AddFlags(kingpin.CommandLine)
kingpin.Version(version.Print("faktory_exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
// Print build context and version.
log.Info("Starting faktory_exporter", version.Info())
log.Info("Build context", version.BuildContext())
// Create a new Faktory exporter. Exit if an error is returned.
exporter, err := New(*faktoryURL)
if err != nil {
log.Error(err)
return 0
}
// Register Faktory and the collector for version information.
// Unregister Go and Process collector which are registered by default.
prometheus.MustRegister(exporter)
prometheus.MustRegister(version.NewCollector("faktory_exporter"))
prometheus.Unregister(prometheus.NewGoCollector())
prometheus.Unregister(prometheus.NewProcessCollector(os.Getpid(), ""))
// Setup router and handlers.
r := http.NewServeMux()
metricsHandler := promhttp.HandlerFor(prometheus.DefaultGatherer,
promhttp.HandlerOpts{ErrorLog: log.NewErrorLogger()})
// TODO: InstrumentHandler is depracted. Additional tools will be available
// soon in the promhttp package.
//r.Handle(*webMetricsPath, prometheus.InstrumentHandler("faktory_exporter", metricsHandler))
r.Handle(*webMetricsPath, metricsHandler)
r.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(landingPage))
})
// Setup webserver.
srv := &http.Server{
Addr: *webListenAddress,
Handler: r,
ReadTimeout: 15 * time.Second,
WriteTimeout: 30 * time.Second,
IdleTimeout: 60 * time.Second,
MaxHeaderBytes: http.DefaultMaxHeaderBytes,
ErrorLog: log.NewErrorLogger(),
}
// Listen for termination signals.
term := make(chan os.Signal, 1)
webErr := make(chan error)
signal.Notify(term, os.Interrupt, syscall.SIGTERM)
// Run webserver in a separate goroutine.
log.Infoln("Listening on", *webListenAddress)
go func() { webErr <- srv.ListenAndServe() }()
// Wait for a termination signal and shut down gracefully, but wait no
// longer than 5 seconds before halting.
select {
case <-term:
log.Warn("Received SIGTERM, exiting gracefully...")
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if err := srv.Shutdown(ctx); err != nil {
log.Errorln("Error shutting down http server:", err)
}
case err := <-webErr:
log.Errorln("Error starting http server, exiting gracefully:", err)
}
log.Info("See you next time!")
return 0
}