This repository has been archived by the owner on Jun 4, 2021. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 225
/
main.go
159 lines (129 loc) · 4.01 KB
/
main.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
/*
Copyright 2018 The Knative Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"log"
"os"
"strconv"
"time"
duckv1 "knative.dev/pkg/apis/duck/v1"
cloudevents "github.com/cloudevents/sdk-go/v2"
"github.com/kelseyhightower/envconfig"
)
type Heartbeat struct {
Sequence int `json:"id"`
Label string `json:"label"`
}
var (
eventSource string
eventType string
sink string
label string
periodStr string
)
func init() {
flag.StringVar(&eventSource, "eventSource", "", "the event-source (CloudEvents)")
flag.StringVar(&eventType, "eventType", "dev.knative.eventing.samples.heartbeat", "the event-type (CloudEvents)")
flag.StringVar(&sink, "sink", "", "the host url to heartbeat to")
flag.StringVar(&label, "label", "", "a special label")
flag.StringVar(&periodStr, "period", "5", "the number of seconds between heartbeats")
}
type envConfig struct {
// Sink URL where to send heartbeat cloudevents
Sink string `envconfig:"K_SINK"`
// CEOverrides are the CloudEvents overrides to be applied to the outbound event.
CEOverrides string `envconfig:"K_CE_OVERRIDES"`
// Name of this pod.
Name string `envconfig:"POD_NAME" required:"true"`
// Namespace this pod exists in.
Namespace string `envconfig:"POD_NAMESPACE" required:"true"`
// Whether to run continuously or exit.
OneShot bool `envconfig:"ONE_SHOT" default:"false"`
}
func main() {
flag.Parse()
var env envConfig
if err := envconfig.Process("", &env); err != nil {
log.Printf("[ERROR] Failed to process env var: %s", err)
os.Exit(1)
}
if env.Sink != "" {
sink = env.Sink
}
var ceOverrides *duckv1.CloudEventOverrides
if len(env.CEOverrides) > 0 {
overrides := duckv1.CloudEventOverrides{}
err := json.Unmarshal([]byte(env.CEOverrides), &overrides)
if err != nil {
log.Printf("[ERROR] Unparseable CloudEvents overrides %s: %v", env.CEOverrides, err)
os.Exit(1)
}
ceOverrides = &overrides
}
p, err := cloudevents.NewHTTP(cloudevents.WithTarget(sink))
if err != nil {
log.Fatalf("failed to create http protocol: %s", err.Error())
}
c, err := cloudevents.NewClient(p, cloudevents.WithUUIDs(), cloudevents.WithTimeNow())
if err != nil {
log.Fatalf("failed to create client: %s", err.Error())
}
var period time.Duration
if p, err := strconv.Atoi(periodStr); err != nil {
period = time.Duration(5) * time.Second
} else {
period = time.Duration(p) * time.Second
}
if eventSource == "" {
eventSource = fmt.Sprintf("https://knative.dev/eventing-contrib/cmd/heartbeats/#%s/%s", env.Namespace, env.Name)
log.Printf("Heartbeats Source: %s", eventSource)
}
if len(label) > 0 && label[0] == '"' {
label, _ = strconv.Unquote(label)
}
hb := &Heartbeat{
Sequence: 0,
Label: label,
}
ticker := time.NewTicker(period)
for {
hb.Sequence++
event := cloudevents.NewEvent("1.0")
event.SetType(eventType)
event.SetSource(eventSource)
event.SetExtension("the", 42)
event.SetExtension("heart", "yes")
event.SetExtension("beats", true)
if ceOverrides != nil && ceOverrides.Extensions != nil {
for n, v := range ceOverrides.Extensions {
event.SetExtension(n, v)
}
}
if err := event.SetData(cloudevents.ApplicationJSON, hb); err != nil {
log.Printf("failed to set cloudevents data: %s", err.Error())
}
log.Printf("sending cloudevent to %s", sink)
if res := c.Send(context.Background(), event); !cloudevents.IsACK(res) {
log.Printf("failed to send cloudevent: %v", res)
}
if env.OneShot {
return
}
// Wait for next tick
<-ticker.C
}
}