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fix(health): improve healthcheck, make sure we close nats connections after checking
author
Gwenn Le Bihan
date
(Feb 8, 2025, 3:34 AM +0100)
commit
c20140d1
c20140d1cb64b9db161af5404081c8ff812ed971
parent
a1317945
a1317945f3458c66ac97dbca963cc64fe9756103
+51
-8
+42
-8
health.go
+42
-8
health.go
···
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"firebase.google.com/go/v4/messaging"
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ll "github.com/gwennlbh/label-logger-go"
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"github.com/nats-io/nats.go"
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"github.com/nats-io/nats.go/jetstream"
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)
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type HealthResponse struct {
···
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Firebase bool `json:"firebase"`
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}
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func (r HealthResponse) AllGood() bool {
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return r.Redis && r.NATS && r.ChurrosDatabase && r.Firebase
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}
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+
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func healthHandler(w http.ResponseWriter, r *http.Request) {
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ll.Debug("Checking health due to request from %s", r.RemoteAddr)
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// Set the content type to JSON
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w.Header().Set("Content-Type", "application/json")
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// Example response (you can modify this with your own business logic)
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response := CheckHealth()
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// Marshal the response to JSON and write it to the response writer
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if err := json.NewEncoder(w).Encode(response); err != nil {
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http.Error(w, "Unable to encode JSON", http.StatusInternalServerError)
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return
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}
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}
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func CheckHealth() HealthResponse {
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response := HealthResponse{}
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if err := CheckRedisHealth(); err != nil {
···
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} else {
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response.Firebase = true
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}
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-
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// Marshal the response to JSON and write it to the response writer
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if err := json.NewEncoder(w).Encode(response); err != nil {
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http.Error(w, "Unable to encode JSON", http.StatusInternalServerError)
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return
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}
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return response
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}
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func StartHealthCheckEndpoint(port int) {
···
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return fmt.Errorf("could not connect to NATS at %s: %w", config.NatsURL, err)
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}
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_, err = nc.JetStream()
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defer nc.Close()
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js, err := jetstream.New(nc)
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if err != nil {
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return fmt.Errorf("could not connect to Jetstream: %w", err)
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}
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return nil
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stream, err := js.CreateStream(context.Background(), jetstream.StreamConfig{
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Name: StreamName,
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Subjects: []string{SubjectName},
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})
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if err != nil {
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return fmt.Errorf("could not create stream: %w", err)
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}
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consumers := stream.ListConsumers(context.Background())
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if consumers.Err() != nil {
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return fmt.Errorf("could not list consumers: %w", consumers.Err())
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}
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for info := range consumers.Info() {
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if consumers.Err() != nil {
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return fmt.Errorf("could not get consumer info: %w", consumers.Err())
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}
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if info.Name == ConsumerName {
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return nil
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}
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}
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return fmt.Errorf("%s not connected to stream", ConsumerName)
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}
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func CheckChurrosDatabaseHealth() error {
+9
server/main.go
+9
server/main.go
···
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// Start healthcheck endpoint
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go notella.StartHealthCheckEndpoint(config.HealthCheckPort)
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// Self-check
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ll.Log("Checking", "cyan", "health")
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result := notella.CheckHealth()
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if result.AllGood() {
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ll.Log("Health check", "green", "succeeded")
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} else {
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ll.Error("Health check failed: %#v", result)
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}
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// Send EventShowScheduledJobs to the stream every 5 minutes and save schedule to redis
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go func() {
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for {