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Signed-off-by: Matthias Wessendorf <mwessend@redhat.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,196 @@ | ||
| /* | ||
| 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 ( | ||
| "encoding/json" | ||
| "errors" | ||
| "flag" | ||
| "fmt" | ||
| "log" | ||
| "net/http" | ||
| "os" | ||
| "strconv" | ||
| "syscall" | ||
| "time" | ||
|
|
||
| "go.uber.org/zap" | ||
| duckv1 "knative.dev/pkg/apis/duck/v1" | ||
| "knative.dev/pkg/signals" | ||
| "knative.dev/pkg/tracing" | ||
| "knative.dev/pkg/tracing/config" | ||
|
|
||
| "github.com/cloudevents/sdk-go/observability/opencensus/v2/client" | ||
| cloudevents "github.com/cloudevents/sdk-go/v2" | ||
| cehttp "github.com/cloudevents/sdk-go/v2/protocol/http" | ||
| "github.com/kelseyhightower/envconfig" | ||
| ) | ||
|
|
||
| type Heartbeat struct { | ||
| Sequence int `json:"id"` | ||
| Label string `json:"label"` | ||
| Msg string `json:"msg,omitempty"` | ||
| } | ||
|
|
||
| var ( | ||
| eventSource string | ||
| eventType string | ||
| sink string | ||
| label string | ||
| periodStr string | ||
| msg 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", "5s", "the duration between heartbeats. Supported formats: Go (https://pkg.go.dev/time#ParseDuration), integers (interpreted as seconds)") | ||
| flag.StringVar(&msg, "msg", "", "message content in data.msg") | ||
| } | ||
|
|
||
| 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"` | ||
|
|
||
| // JSON configuration for tracing | ||
| TracingConfig string `envconfig:"K_CONFIG_TRACING"` | ||
| } | ||
|
|
||
| func main() { | ||
| flag.Parse() | ||
|
|
||
| ctx := signals.NewContext() | ||
| ctx = cloudevents.ContextWithRetriesExponentialBackoff(ctx, 20*time.Millisecond, 10) | ||
|
|
||
| defer maybeQuitIstioProxy() | ||
|
|
||
| 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 | ||
| } | ||
|
|
||
| conf, err := config.JSONToTracingConfig(env.TracingConfig) | ||
| if err != nil { | ||
| log.Printf("Failed to read tracing config, using the no-op default: %v", err) | ||
| } | ||
| tracer, err := tracing.SetupPublishingWithStaticConfig(zap.L().Sugar(), "", conf) | ||
| if err != nil { | ||
| log.Fatalf("Failed to initialize tracing: %v", err) | ||
| } | ||
| defer tracer.Shutdown(ctx) | ||
| c, err := client.NewClientHTTP([]cehttp.Option{cloudevents.WithTarget(sink)}, nil) | ||
| if err != nil { | ||
| log.Fatalf("failed to create client: %s", err.Error()) | ||
| } | ||
|
|
||
| // default to 5s if unset, try to parse as a duration, then as an int | ||
| var period time.Duration | ||
| if periodStr == "" { | ||
| period = 5 * time.Second | ||
| } else if p, err := time.ParseDuration(periodStr); err == nil { | ||
| period = p | ||
| } else if p, err := strconv.Atoi(periodStr); err == nil { | ||
| period = time.Duration(p) * time.Second | ||
| } else { | ||
| log.Fatalf("Invalid period interval provided: %q", periodStr) | ||
| } | ||
|
|
||
| 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, | ||
| Msg: msg, | ||
| } | ||
| 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 msg: %s", err.Error()) | ||
| } | ||
|
|
||
| log.Printf("sending cloudevent to %s", sink) | ||
| if res := c.Send(ctx, event); !cloudevents.IsACK(res) { | ||
| log.Printf("failed to send cloudevent: %v", res) | ||
| } | ||
|
|
||
| if env.OneShot { | ||
| return | ||
| } | ||
|
|
||
| // Wait for next tick | ||
| <-ticker.C | ||
| } | ||
| } | ||
|
|
||
| // maybeQuitIstioProxy shuts down Istio's proxy when available. | ||
| func maybeQuitIstioProxy() { | ||
| _, err := http.DefaultClient.Get("http://localhost:15020/quitquitquit") | ||
| if err != nil && !errors.Is(err, syscall.ECONNREFUSED) { | ||
| log.Println("[Ignore this warning if Istio proxy is not used on this pod]", err) | ||
| } | ||
| } |
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