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87 lines
2.6 KiB
87 lines
2.6 KiB
4 years ago
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/*
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* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package bandwidth
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import (
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"context"
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"io"
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"time"
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)
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// MonitoredReader monitors the bandwidth
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type MonitoredReader struct {
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bucket string // Token to track bucket
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bucketMeasurement *bucketMeasurement // bucket measurement object
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object string // Token to track object
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reader io.Reader // Reader to wrap
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lastStop time.Time // Last timestamp for a measurement
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headerSize int // Size of the header not captured by reader
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throttle *throttle // throttle the rate at which replication occur
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monitor *Monitor // Monitor reference
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closed bool // Reader is closed
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}
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// NewMonitoredReader returns a io.ReadCloser that reports bandwidth details
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func NewMonitoredReader(ctx context.Context, monitor *Monitor, bucket string, object string, reader io.Reader, headerSize int, bandwidthBytesPerSecond int64) *MonitoredReader {
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timeNow := time.Now()
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b := monitor.track(bucket, object, timeNow)
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return &MonitoredReader{
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bucket: bucket,
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object: object,
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bucketMeasurement: b,
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reader: reader,
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lastStop: timeNow,
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headerSize: headerSize,
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throttle: monitor.throttleBandwidth(ctx, bucket, bandwidthBytesPerSecond),
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monitor: monitor,
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}
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}
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// Read wraps the read reader
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func (m *MonitoredReader) Read(p []byte) (n int, err error) {
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if m.closed {
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err = io.ErrClosedPipe
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return
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}
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p = p[:m.throttle.GetLimitForBytes(int64(len(p)))]
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n, err = m.reader.Read(p)
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stop := time.Now()
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update := uint64(n + m.headerSize)
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m.bucketMeasurement.incrementBytes(update)
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m.lastStop = stop
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unused := len(p) - (n + m.headerSize)
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m.headerSize = 0 // Set to 0 post first read
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if unused > 0 {
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m.throttle.ReleaseUnusedBandwidth(int64(unused))
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}
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return
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}
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// Close stops tracking the io
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func (m *MonitoredReader) Close() error {
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rc, ok := m.reader.(io.ReadCloser)
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m.closed = true
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if ok {
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return rc.Close()
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}
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return nil
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}
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