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// Copyright (C) 2015 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
package model
import (
"time"
"github.com/syncthing/syncthing/lib/events"
"github.com/syncthing/syncthing/lib/sync"
)
type folderState int
const (
FolderIdle folderState = iota
FolderScanning
FolderSyncing
FolderError
)
func (s folderState) String() string {
switch s {
case FolderIdle:
return "idle"
case FolderScanning:
return "scanning"
case FolderSyncing:
return "syncing"
case FolderError:
return "error"
default:
return "unknown"
}
}
type stateTracker struct {
folderID string
mut sync.Mutex
current folderState
err error
changed time.Time
}
func newStateTracker(id string) stateTracker {
return stateTracker{
folderID: id,
mut: sync.NewMutex(),
}
}
// setState sets the new folder state, for states other than FolderError.
func (s *stateTracker) setState(newState folderState) {
if newState == FolderError {
panic("must use setError")
}
s.mut.Lock()
if newState != s.current {
/* This should hold later...
if s.current != FolderIdle && (newState == FolderScanning || newState == FolderSyncing) {
panic("illegal state transition " + s.current.String() + " -> " + newState.String())
}
*/
eventData := map[string]interface{}{
"folder": s.folderID,
"to": newState.String(),
"from": s.current.String(),
}
if !s.changed.IsZero() {
eventData["duration"] = time.Since(s.changed).Seconds()
}
s.current = newState
s.changed = time.Now()
events.Default.Log(events.StateChanged, eventData)
}
s.mut.Unlock()
}
// getState returns the current state, the time when it last changed, and the
// current error or nil.
func (s *stateTracker) getState() (current folderState, changed time.Time, err error) {
s.mut.Lock()
current, changed, err = s.current, s.changed, s.err
s.mut.Unlock()
return
}
// setError sets the folder state to FolderError with the specified error.
func (s *stateTracker) setError(err error) {
s.mut.Lock()
if s.current != FolderError || s.err.Error() != err.Error() {
eventData := map[string]interface{}{
"folder": s.folderID,
"to": FolderError.String(),
"from": s.current.String(),
"error": err.Error(),
}
if !s.changed.IsZero() {
eventData["duration"] = time.Since(s.changed).Seconds()
}
s.current = FolderError
s.err = err
s.changed = time.Now()
events.Default.Log(events.StateChanged, eventData)
}
s.mut.Unlock()
}
// clearError sets the folder state to FolderIdle and clears the error
func (s *stateTracker) clearError() {
s.mut.Lock()
if s.current == FolderError {
eventData := map[string]interface{}{
"folder": s.folderID,
"to": FolderIdle.String(),
"from": s.current.String(),
}
if !s.changed.IsZero() {
eventData["duration"] = time.Since(s.changed).Seconds()
}
s.current = FolderIdle
s.err = nil
s.changed = time.Now()
events.Default.Log(events.StateChanged, eventData)
}
s.mut.Unlock()
}
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