81 lines
2.4 KiB
Go
81 lines
2.4 KiB
Go
/*
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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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)
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// MonitoredReader monitors the bandwidth
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type MonitoredReader struct {
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opts *MonitorReaderOptions
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bucketMeasurement *bucketMeasurement // bucket measurement object
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reader io.Reader // Reader to wrap
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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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lastErr error // last error reported, if this non-nil all reads will fail.
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}
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// MonitorReaderOptions provides configurable options for monitor reader implementation.
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type MonitorReaderOptions struct {
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Bucket string
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Object string
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HeaderSize int
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BandwidthBytesPerSec int64
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ClusterBandwidth int64
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}
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// NewMonitoredReader returns a io.Reader that reports bandwidth details.
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func NewMonitoredReader(ctx context.Context, monitor *Monitor, reader io.Reader, opts *MonitorReaderOptions) *MonitoredReader {
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return &MonitoredReader{
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opts: opts,
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bucketMeasurement: monitor.track(opts.Bucket, opts.Object),
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reader: reader,
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throttle: monitor.throttleBandwidth(ctx, opts.Bucket, opts.BandwidthBytesPerSec, opts.ClusterBandwidth),
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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.lastErr != nil {
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err = m.lastErr
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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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if err != nil {
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m.lastErr = err
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}
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update := n + m.opts.HeaderSize
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unused := len(p) - update
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m.bucketMeasurement.incrementBytes(uint64(update))
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m.opts.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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