OP#792 initial commit after fork

cmd/metrics-router.go

@@ -0,0 +1,75 @@
+// Copyright (c) 2015-2021 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package cmd
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/minio/mux"
+	"github.com/minio/pkg/v3/env"
+)
+
+const (
+	prometheusMetricsPathLegacy     = "/prometheus/metrics"
+	prometheusMetricsV2ClusterPath  = "/v2/metrics/cluster"
+	prometheusMetricsV2BucketPath   = "/v2/metrics/bucket"
+	prometheusMetricsV2NodePath     = "/v2/metrics/node"
+	prometheusMetricsV2ResourcePath = "/v2/metrics/resource"
+
+	// Metrics v3 endpoints
+	metricsV3Path = "/metrics/v3"
+)
+
+// Standard env prometheus auth type
+const (
+	EnvPrometheusAuthType    = "MINIO_PROMETHEUS_AUTH_TYPE"
+	EnvPrometheusOpenMetrics = "MINIO_PROMETHEUS_OPEN_METRICS"
+)
+
+type prometheusAuthType string
+
+const (
+	prometheusJWT    prometheusAuthType = "jwt"
+	prometheusPublic prometheusAuthType = "public"
+)
+
+// registerMetricsRouter - add handler functions for metrics.
+func registerMetricsRouter(router *mux.Router) {
+	// metrics router
+	metricsRouter := router.NewRoute().PathPrefix(minioReservedBucketPath).Subrouter()
+	authType := prometheusAuthType(strings.ToLower(env.Get(EnvPrometheusAuthType, string(prometheusJWT))))
+
+	auth := AuthMiddleware
+	if authType == prometheusPublic {
+		auth = NoAuthMiddleware
+	}
+
+	metricsRouter.Handle(prometheusMetricsPathLegacy, auth(metricsHandler()))
+	metricsRouter.Handle(prometheusMetricsV2ClusterPath, auth(metricsServerHandler()))
+	metricsRouter.Handle(prometheusMetricsV2BucketPath, auth(metricsBucketHandler()))
+	metricsRouter.Handle(prometheusMetricsV2NodePath, auth(metricsNodeHandler()))
+	metricsRouter.Handle(prometheusMetricsV2ResourcePath, auth(metricsResourceHandler()))
+
+	// Metrics v3
+	metricsV3Server := newMetricsV3Server(auth)
+
+	// Register metrics v3 handler. It also accepts an optional query
+	// parameter `?list` - see handler for details.
+	metricsRouter.Methods(http.MethodGet).Path(metricsV3Path + "{pathComps:.*}").Handler(metricsV3Server)
+}