rename all remaining packages to internal/ (#12418)

This is to ensure that there are no projects
that try to import `minio/minio/pkg` into
their own repo. Any such common packages should
go to `https://github.com/minio/pkg`

internal/bucket/bandwidth/monitor.go

@@ -0,0 +1,155 @@
+// 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 bandwidth
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	"github.com/minio/madmin-go"
+)
+
+// throttleBandwidth gets the throttle for bucket with the configured value
+func (m *Monitor) throttleBandwidth(ctx context.Context, bucket string, bandwidthBytesPerSecond int64, clusterBandwidth int64) *throttle {
+	m.lock.Lock()
+	defer m.lock.Unlock()
+	throttle, ok := m.bucketThrottle[bucket]
+	if !ok {
+		throttle = newThrottle(ctx, bandwidthBytesPerSecond, clusterBandwidth)
+		m.bucketThrottle[bucket] = throttle
+		return throttle
+	}
+	throttle.SetBandwidth(bandwidthBytesPerSecond, clusterBandwidth)
+	return throttle
+}
+
+// Monitor implements the monitoring for bandwidth measurements.
+type Monitor struct {
+	lock sync.Mutex // lock for all updates
+
+	activeBuckets map[string]*bucketMeasurement // Buckets with objects in flight
+
+	bucketMovingAvgTicker *time.Ticker // Ticker for calculating moving averages
+
+	bucketThrottle map[string]*throttle
+
+	doneCh <-chan struct{}
+}
+
+// NewMonitor returns a monitor with defaults.
+func NewMonitor(doneCh <-chan struct{}) *Monitor {
+	m := &Monitor{
+		activeBuckets:         make(map[string]*bucketMeasurement),
+		bucketMovingAvgTicker: time.NewTicker(2 * time.Second),
+		bucketThrottle:        make(map[string]*throttle),
+		doneCh:                doneCh,
+	}
+	go m.trackEWMA()
+	return m
+}
+
+// SelectionFunction for buckets
+type SelectionFunction func(bucket string) bool
+
+// SelectBuckets will select all the buckets passed in.
+func SelectBuckets(buckets ...string) SelectionFunction {
+	if len(buckets) == 0 {
+		return func(bucket string) bool {
+			return true
+		}
+	}
+	return func(bucket string) bool {
+		for _, b := range buckets {
+			if b == "" || b == bucket {
+				return true
+			}
+		}
+		return false
+	}
+}
+
+// GetReport gets the report for all bucket bandwidth details.
+func (m *Monitor) GetReport(selectBucket SelectionFunction) *madmin.BucketBandwidthReport {
+	m.lock.Lock()
+	defer m.lock.Unlock()
+	return m.getReport(selectBucket)
+}
+
+func (m *Monitor) getReport(selectBucket SelectionFunction) *madmin.BucketBandwidthReport {
+	report := &madmin.BucketBandwidthReport{
+		BucketStats: make(map[string]madmin.BandwidthDetails),
+	}
+	for bucket, bucketMeasurement := range m.activeBuckets {
+		if !selectBucket(bucket) {
+			continue
+		}
+		bucketThrottle, ok := m.bucketThrottle[bucket]
+		if !ok {
+			continue
+		}
+		report.BucketStats[bucket] = madmin.BandwidthDetails{
+			LimitInBytesPerSecond:            bucketThrottle.clusterBandwidth,
+			CurrentBandwidthInBytesPerSecond: bucketMeasurement.getExpMovingAvgBytesPerSecond(),
+		}
+	}
+	return report
+}
+
+func (m *Monitor) trackEWMA() {
+	for {
+		select {
+		case <-m.bucketMovingAvgTicker.C:
+			m.updateMovingAvg()
+		case <-m.doneCh:
+			return
+		}
+	}
+}
+
+func (m *Monitor) getBucketMeasurement(bucket string, initTime time.Time) *bucketMeasurement {
+	bucketTracker, ok := m.activeBuckets[bucket]
+	if !ok {
+		bucketTracker = newBucketMeasurement(initTime)
+		m.activeBuckets[bucket] = bucketTracker
+	}
+	return bucketTracker
+}
+
+func (m *Monitor) updateMovingAvg() {
+	m.lock.Lock()
+	defer m.lock.Unlock()
+	for _, bucketMeasurement := range m.activeBuckets {
+		bucketMeasurement.updateExponentialMovingAverage(time.Now())
+	}
+}
+
+// track returns the measurement object for bucket and object
+func (m *Monitor) track(bucket string, object string) *bucketMeasurement {
+	m.lock.Lock()
+	defer m.lock.Unlock()
+	return m.getBucketMeasurement(bucket, time.Now())
+}
+
+// DeleteBucket deletes monitoring the 'bucket'
+func (m *Monitor) DeleteBucket(bucket string) {
+	m.lock.Lock()
+	defer m.lock.Unlock()
+	delete(m.activeBuckets, bucket)
+	delete(m.bucketThrottle, bucket)
+}