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/
main.go
88 lines (76 loc) · 1.94 KB
/
main.go
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package main
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"os"
"strings"
cloudevents "github.com/cloudevents/sdk-go"
"github.com/google/knative-gcp/pkg/pubsub/adapter/converters"
"github.com/kelseyhightower/envconfig"
)
func main() {
client, err := cloudevents.NewDefaultClient()
if err != nil {
panic(err)
}
r := Receiver{}
if err := envconfig.Process("", &r); err != nil {
panic(err)
}
fmt.Printf("Target prefix to match: %q.\n", r.Target)
if err := client.StartReceiver(context.Background(), r.Receive); err != nil {
log.Fatal(err)
}
}
type Receiver struct {
Target string `envconfig:"TARGET" required:"true"`
}
func (r *Receiver) Receive(event cloudevents.Event) {
var target string
// Try Pull first used by the PullSubscription.
err := event.ExtensionAs("target", &target)
if err != nil {
// If it fails, try Push format used by the CloudPubSubSource.
data, err := event.DataBytes()
if err != nil {
fmt.Println("failed to get data from event", err)
return
}
push := converters.PushMessage{}
if err := json.Unmarshal(data, &push); err != nil {
fmt.Println("failed to unmarshall PubMessage", err)
return
}
if tt, ok := push.Message.Attributes["target"]; !ok {
fmt.Println("failed to get target from attributes:", err)
return
} else {
target = tt
}
}
var success bool
if strings.Contains(r.Target, target) {
fmt.Printf("Target found, %q.\n", r.Target)
success = true
} else {
fmt.Printf("Target not found, got:%q, want:%q.\n", target, r.Target)
success = false
}
// Write the termination message.
if err := r.writeTerminationMessage(map[string]interface{}{
"success": success,
}); err != nil {
fmt.Printf("failed to write termination message, %s.\n", err)
}
os.Exit(0)
}
func (r *Receiver) writeTerminationMessage(result interface{}) error {
b, err := json.Marshal(result)
if err != nil {
return err
}
return ioutil.WriteFile("/dev/termination-log", b, 0644)
}