Initial commit based on https://github.com/minio/minio/releases/tag/RELEASE.2020-07-02T00-15-09Z

cmd/gateway-metrics.go

@@ -0,0 +1,82 @@
+/*
+ * MinIO Cloud Storage, (C) 2019 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"net/http"
+	"sync/atomic"
+)
+
+// RequestStats - counts for Get and Head requests
+type RequestStats struct {
+	Get  uint64 `json:"Get"`
+	Head uint64 `json:"Head"`
+	Put  uint64 `json:"Put"`
+	Post uint64 `json:"Post"`
+}
+
+// Metrics - represents bytes served from backend
+// only implemented for S3 Gateway
+type Metrics struct {
+	bytesReceived uint64
+	bytesSent     uint64
+	requestStats  RequestStats
+}
+
+// IncBytesReceived - Increase total bytes received from gateway backend
+func (s *Metrics) IncBytesReceived(n uint64) {
+	atomic.AddUint64(&s.bytesReceived, n)
+}
+
+// GetBytesReceived - Get total bytes received from gateway backend
+func (s *Metrics) GetBytesReceived() uint64 {
+	return atomic.LoadUint64(&s.bytesReceived)
+}
+
+// IncBytesSent - Increase total bytes sent to gateway backend
+func (s *Metrics) IncBytesSent(n uint64) {
+	atomic.AddUint64(&s.bytesSent, n)
+}
+
+// GetBytesSent - Get total bytes received from gateway backend
+func (s *Metrics) GetBytesSent() uint64 {
+	return atomic.LoadUint64(&s.bytesSent)
+}
+
+// IncRequests - Increase request count sent to gateway backend by 1
+func (s *Metrics) IncRequests(method string) {
+	// Only increment for Head & Get requests, else no op
+	if method == http.MethodGet {
+		atomic.AddUint64(&s.requestStats.Get, 1)
+	} else if method == http.MethodHead {
+		atomic.AddUint64(&s.requestStats.Head, 1)
+	} else if method == http.MethodPut {
+		atomic.AddUint64(&s.requestStats.Put, 1)
+	} else if method == http.MethodPost {
+		atomic.AddUint64(&s.requestStats.Post, 1)
+	}
+}
+
+// GetRequests - Get total number of Get & Headrequests sent to gateway backend
+func (s *Metrics) GetRequests() RequestStats {
+	return s.requestStats
+}
+
+// NewMetrics - Prepare new Metrics structure
+func NewMetrics() *Metrics {
+	return &Metrics{}
+}