test(osiris): test osiris features and ensure it works

Signed-off-by: Xe Iaso <me@xeiaso.net>

cmd/osiris/internal/entrypoint/metrics.go

@@ -0,0 +1,72 @@
+package entrypoint
+
+import (
+	"bytes"
+	"fmt"
+	"log/slog"
+	"net/http"
+	"sort"
+
+	"github.com/TecharoHQ/anubis/internal"
+	healthv1 "google.golang.org/grpc/health/grpc_health_v1"
+)
+
+func healthz(w http.ResponseWriter, r *http.Request) {
+	services, err := internal.HealthSrv.List(r.Context(), nil)
+	if err != nil {
+		slog.Error("can't get list of services", "err", err)
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	var keys []string
+	for k := range services.Statuses {
+		if k == "" {
+			continue
+		}
+		keys = append(keys, k)
+	}
+
+	sort.Strings(keys)
+
+	var msg bytes.Buffer
+
+	var healthy bool = true
+
+	for _, k := range keys {
+		st := services.Statuses[k].GetStatus()
+		fmt.Fprintf(&msg, "%s: %s\n", k, st)
+		switch st {
+		case healthv1.HealthCheckResponse_SERVING:
+			// do nothing
+		default:
+			healthy = false
+		}
+	}
+
+	if !healthy {
+		w.WriteHeader(http.StatusInternalServerError)
+	}
+
+	w.Write(msg.Bytes())
+}
+
+func readyz(w http.ResponseWriter, r *http.Request) {
+	st, ok := internal.GetHealth("osiris")
+	if !ok {
+		slog.Error("health service osiris does not exist, file a bug")
+		http.Error(w, "health service osiris does not exist", http.StatusExpectationFailed)
+	}
+
+	switch st {
+	case healthv1.HealthCheckResponse_NOT_SERVING:
+		http.Error(w, "NOT OK", http.StatusInternalServerError)
+		return
+	case healthv1.HealthCheckResponse_SERVING:
+		fmt.Fprintln(w, "OK")
+		return
+	default:
+		http.Error(w, "UNKNOWN", http.StatusFailedDependency)
+		return
+	}
+}