feat(http): add healthcheck endpoints liveness and readiness (#240)

* feat(http): add liveness and readiness endpoints

* feat(http): improve unhealthy msg

internal/http/health.go

@@ -0,0 +1,51 @@
+package http
+
+import (
+	"net/http"
+
+	"github.com/autobrr/autobrr/internal/database"
+
+	"github.com/go-chi/chi"
+)
+
+type healthHandler struct {
+	encoder encoder
+	db      *database.DB
+}
+
+func newHealthHandler(encoder encoder, db *database.DB) *healthHandler {
+	return &healthHandler{
+		encoder: encoder,
+		db:      db,
+	}
+}
+
+func (h healthHandler) Routes(r chi.Router) {
+	r.Get("/liveness", h.handleLiveness)
+	r.Get("/readiness", h.handleReadiness)
+}
+
+func (h healthHandler) handleLiveness(w http.ResponseWriter, _ *http.Request) {
+	writeHealthy(w)
+}
+
+func (h healthHandler) handleReadiness(w http.ResponseWriter, _ *http.Request) {
+	if err := h.db.Ping(); err != nil {
+		writeUnhealthy(w)
+		return
+	}
+
+	writeHealthy(w)
+}
+
+func writeHealthy(w http.ResponseWriter) {
+	w.Header().Set("Content-Type", "text/plain")
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte("OK"))
+}
+
+func writeUnhealthy(w http.ResponseWriter) {
+	w.Header().Set("Content-Type", "text/plain")
+	w.WriteHeader(http.StatusInternalServerError)
+	w.Write([]byte("Unhealthy. Database unreachable"))
+}

internal/http/server.go

@@ -6,6 +6,7 @@ import (
 	"net"
 	"net/http"
 
+	"github.com/autobrr/autobrr/internal/database"
 	"github.com/autobrr/autobrr/internal/domain"
 	"github.com/autobrr/autobrr/web"
 
@@ -17,6 +18,7 @@ import (
 
 type Server struct {
 	sse *sse.Server
+	db  *database.DB
 
 	config      domain.Config
 	cookieStore *sessions.CookieStore
@@ -35,10 +37,11 @@ type Server struct {
 	releaseService        releaseService
 }
 
-func NewServer(config domain.Config, sse *sse.Server, version string, commit string, date string, actionService actionService, authService authService, downloadClientSvc downloadClientService, filterSvc filterService, indexerSvc indexerService, ircSvc ircService, notificationSvc notificationService, releaseSvc releaseService) Server {
+func NewServer(config domain.Config, sse *sse.Server, db *database.DB, version string, commit string, date string, actionService actionService, authService authService, downloadClientSvc downloadClientService, filterSvc filterService, indexerSvc indexerService, ircSvc ircService, notificationSvc notificationService, releaseSvc releaseService) Server {
 	return Server{
 		config:  config,
 		sse:     sse,
+		db:      db,
 		version: version,
 		commit:  commit,
 		date:    date,
@@ -98,6 +101,7 @@ func (s Server) Handler() http.Handler {
 	})
 
 	r.Route("/api/auth", newAuthHandler(encoder, s.config, s.cookieStore, s.authService).Routes)
+	r.Route("/api/healthz", newHealthHandler(encoder, s.db).Routes)
 
 	r.Group(func(r chi.Router) {
 		r.Use(s.IsAuthenticated)