Implement health check for deploy. Make version endpoint to return revision if not set

internal/api/module.go

@@ -11,6 +11,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"go.uber.org/fx"
 
+	"payouts/internal/api/health"
 	"payouts/internal/api/payout"
 	"payouts/internal/api/user"
 	"payouts/internal/api/version"
@@ -21,6 +22,7 @@ import (
 // Module is a fx module
 var Module = fx.Options(
 	user.Module,
+	health.Module,
 	payout.Module,
 	version.Module,
 	monitoring.Module,
@@ -40,6 +42,7 @@ type Params struct {
 	PayoutHandler payout.Handler
 	UserHandler   user.Handler
 	Version       version.Handler
+	HealthHandler health.Handler
 
 	Metrics monitoring.Metrics
 }
@@ -50,7 +53,10 @@ func RegisterRoutes(p Params, lc fx.Lifecycle) {
 	router := mux.NewRouter()
 	router.StrictSlash(true)
 
+	// Version endpoint
 	router.HandleFunc(version.Route, p.Version.VersionHandler).Methods(http.MethodGet)
+	// Health check endpoint
+	router.HandleFunc(health.Route, p.HealthHandler.Health).Methods(http.MethodGet)
 
 	if p.AppConfig.Server.EnablePProfEndpoints {
 		router.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)