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healthz.go
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healthz.go
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package probes
import (
"context"
"fmt"
"net/http"
"time"
"github.com/solo-io/go-utils/contextutils"
)
func StartLivenessProbeServer(ctx context.Context) {
var server *http.Server
// Run the server in a goroutine
go func() {
mux := new(http.ServeMux)
mux.HandleFunc("/healthz", okHandler)
server = &http.Server{
Addr: fmt.Sprintf(":%d", 8765),
Handler: mux,
}
contextutils.LoggerFrom(ctx).Infof("healthz server starting at %s", server.Addr)
err := server.ListenAndServe()
if err == http.ErrServerClosed {
contextutils.LoggerFrom(ctx).Info("healthz server closed")
} else {
contextutils.LoggerFrom(ctx).Warnf("healthz server closed with unexpected error: %v", err)
}
}()
// Run a separate goroutine to handle the server shutdown when the context is cancelled
go func() {
<-ctx.Done()
if server != nil {
shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 2*time.Second)
defer shutdownCancel()
if err := server.Shutdown(shutdownCtx); err != nil {
contextutils.LoggerFrom(shutdownCtx).Warnf("healthz server shutdown returned error: %v", err)
}
}
}()
}
func okHandler(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, "OK\n")
}