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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package snapstate
import (
"math"
"github.com/snapcore/snapd/overlord/state"
"github.com/snapcore/snapd/progress"
)
// taskProgressAdapter adapts a task into a progress.Meter
// until we have native install/update/remove.
type taskProgressAdapter struct {
task *state.Task
unlocked bool
label string
total float64
current float64
lastReported float64
}
// NewTaskProgressAdapterUnlocked creates an adapter of the task into a progress.Meter to use while the state is unlocked
func NewTaskProgressAdapterUnlocked(t *state.Task) progress.Meter {
return &taskProgressAdapter{task: t, unlocked: true}
}
// NewTaskProgressAdapterLocked creates an adapter of the task into a progress.Meter to use while the state is locked
func NewTaskProgressAdapterLocked(t *state.Task) progress.Meter {
return &taskProgressAdapter{task: t, unlocked: false}
}
// Start sets total
func (t *taskProgressAdapter) Start(label string, total float64) {
t.label = label
t.total = total
t.Set(0.0)
}
// Set sets the current progress
func (t *taskProgressAdapter) Set(current float64) {
t.current = current
// check if we made at least "minProgress" before we lock the state
// (using Abs to ensure that even if lastReported is smaller than
// current we still report progress)
const minProgress = 0.2 / 100.0
if current != 0.0 && math.Abs(t.current-t.lastReported)/t.total < minProgress {
return
}
t.lastReported = t.current
// set progress in task
if t.unlocked {
t.task.State().Lock()
defer t.task.State().Unlock()
}
t.task.SetProgress(t.label, int(current), int(t.total))
}
// SetTotal sets the maximum progress
func (t *taskProgressAdapter) SetTotal(total float64) {
t.total = total
}
// Finished set the progress to 100%
func (t *taskProgressAdapter) Finished() {
if t.unlocked {
t.task.State().Lock()
defer t.task.State().Unlock()
}
t.task.SetProgress(t.label, int(t.total), int(t.total))
}
// Write sets the current write progress
func (t *taskProgressAdapter) Write(p []byte) (n int, err error) {
t.Set(t.current + float64(len(p)))
return len(p), nil
}
// Notify notifies
func (t *taskProgressAdapter) Notify(msg string) {
if t.unlocked {
t.task.State().Lock()
defer t.task.State().Unlock()
}
t.task.Logf(msg)
}
// Spin does nothing
func (t *taskProgressAdapter) Spin(msg string) {
}
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