/
passthrough_monitor.go
53 lines (46 loc) · 1.64 KB
/
passthrough_monitor.go
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/**
* Copyright 2021 Adobe. All rights reserved.
* This file is licensed to you 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 REPRESENTATIONS
* OF ANY KIND, either express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
package util
import (
"io"
"time"
"github.com/adobe/aquarium-fish/lib/log"
)
// Wraps an existing io.Reader to monitor the stream
//
// It simply forwards the Read() call, while displaying
// the results from individual calls to it.
type PassThruMonitor struct {
io.Reader
Name string // Prefix for the message
Length int64 // Expected length
total int64
progress float64
print_ts time.Time
}
// Read 'overrides' the underlying io.Reader's Read method.
// This is the one that will be called by io.Copy(). We simply
// use it to keep track of byte counts and then forward the call.
func (pt *PassThruMonitor) Read(p []byte) (int, error) {
n, err := pt.Reader.Read(p)
if n > 0 {
pt.total += int64(n)
percentage := float64(pt.total) / float64(pt.Length) * float64(100)
if percentage-pt.progress > 10 || time.Now().Sub(pt.print_ts) > 30*time.Second {
// Show status every 10% or 30 sec
log.Infof("%s: %v%% (%dB)", pt.Name, int(percentage), pt.total)
pt.progress = percentage
pt.print_ts = time.Now()
}
}
return n, err
}