authorize: grpc health check (#2200)

pkg/grpc/health.go

@@ -0,0 +1,34 @@
+package grpc
+
+import (
+	"context"
+
+	"google.golang.org/grpc/codes"
+	grpc_health "google.golang.org/grpc/health/grpc_health_v1"
+	"google.golang.org/grpc/status"
+
+	"github.com/pomerium/pomerium/internal/log"
+)
+
+type healthCheckSrv struct {
+}
+
+// NewHealthCheckServer returns a basic health checker
+func NewHealthCheckServer() grpc_health.HealthServer {
+	return &healthCheckSrv{}
+}
+
+// Check confirms service is reachable, and assumes any service is operational
+// an outlier detection should be used to detect runtime malfunction based on consequitive 5xx
+func (h *healthCheckSrv) Check(ctx context.Context, req *grpc_health.HealthCheckRequest) (*grpc_health.HealthCheckResponse, error) {
+	log.Debug(ctx).Str("service", req.Service).Msg("health check")
+	return &grpc_health.HealthCheckResponse{
+		Status: grpc_health.HealthCheckResponse_SERVING,
+	}, nil
+}
+
+// Watch is not implemented as is not used by Envoy
+func (h *healthCheckSrv) Watch(req *grpc_health.HealthCheckRequest, _ grpc_health.Health_WatchServer) error {
+	log.Error(context.Background()).Str("service", req.Service).Msg("health check watch")
+	return status.Errorf(codes.Unimplemented, "method Watch not implemented")
+}