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http-progress.go
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http-progress.go
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/*
* Copyright (c) 2019-2021. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells 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.
*
* Pydio Cells 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 Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package net
import (
"io"
"math"
"net/http"
)
// ProgressMonitor provides a TeeReader to wrap a reader and send a progress inside a dedicated channel
type ProgressMonitor struct {
expectedSize uint64
currentSize uint64
currentPg float64
progressChan chan float64
doneChan chan bool
SizeChan chan uint64
}
// BodyWithProgressMonitor creates a ProgressMonitor directly from an http.Response
func BodyWithProgressMonitor(resp *http.Response, progress chan float64, done chan bool) io.Reader {
expected := uint64(0)
if resp.ContentLength > 0 {
expected = uint64(resp.ContentLength)
}
return io.TeeReader(resp.Body, NewProgressMonitor(expected, progress, done))
}
// NewProgressMonitor initialize a ProgressMonitor with the channels
func NewProgressMonitor(expected uint64, progress chan float64, done chan bool) *ProgressMonitor {
m := &ProgressMonitor{
expectedSize: expected,
progressChan: progress,
doneChan: done,
}
return m
}
// Write implements the io.Writer interface to be used by a TeeReader
func (m *ProgressMonitor) Write(p []byte) (int, error) {
n := len(p)
m.currentSize += uint64(n)
if m.progressChan != nil && m.expectedSize > 0 {
progress100 := math.Floor(100 * float64(m.currentSize) / float64(m.expectedSize))
if progress100 != m.currentPg {
m.progressChan <- float64(m.currentSize) / float64(m.expectedSize)
}
m.currentPg = progress100
}
if m.SizeChan != nil {
m.SizeChan <- m.currentSize
}
if m.doneChan != nil && m.expectedSize > 0 && m.currentSize == m.expectedSize {
m.doneChan <- true
}
return n, nil
}