syncthing/lib/model/progressemitter.go

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// Copyright (C) 2014 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 (
"fmt"
"path/filepath"
"time"
"github.com/syncthing/syncthing/lib/config"
"github.com/syncthing/syncthing/lib/events"
"github.com/syncthing/syncthing/lib/protocol"
"github.com/syncthing/syncthing/lib/sync"
)
type ProgressEmitter struct {
registry map[string]*sharedPullerState
interval time.Duration
minBlocks int
sentDownloadStates map[protocol.DeviceID]*sentDownloadState // States representing what we've sent to the other peer via DownloadProgress messages.
connections map[string][]protocol.Connection
mut sync.Mutex
timer *time.Timer
stop chan struct{}
}
// NewProgressEmitter creates a new progress emitter which emits
// DownloadProgress events every interval.
func NewProgressEmitter(cfg *config.Wrapper) *ProgressEmitter {
t := &ProgressEmitter{
stop: make(chan struct{}),
registry: make(map[string]*sharedPullerState),
timer: time.NewTimer(time.Millisecond),
sentDownloadStates: make(map[protocol.DeviceID]*sentDownloadState),
connections: make(map[string][]protocol.Connection),
mut: sync.NewMutex(),
}
t.CommitConfiguration(config.Configuration{}, cfg.Raw())
cfg.Subscribe(t)
return t
}
// Serve starts the progress emitter which starts emitting DownloadProgress
// events as the progress happens.
func (t *ProgressEmitter) Serve() {
var lastUpdate time.Time
var lastCount, newCount int
for {
select {
case <-t.stop:
l.Debugln("progress emitter: stopping")
return
case <-t.timer.C:
t.mut.Lock()
l.Debugln("progress emitter: timer - looking after", len(t.registry))
newLastUpdated := lastUpdate
newCount = len(t.registry)
for _, puller := range t.registry {
updated := puller.Updated()
if updated.After(newLastUpdated) {
newLastUpdated = updated
}
}
if !newLastUpdated.Equal(lastUpdate) || newCount != lastCount {
lastUpdate = newLastUpdated
lastCount = newCount
t.sendDownloadProgressEvent()
if len(t.connections) > 0 {
t.sendDownloadProgressMessages()
}
} else {
l.Debugln("progress emitter: nothing new")
}
if newCount != 0 {
t.timer.Reset(t.interval)
}
t.mut.Unlock()
}
}
}
func (t *ProgressEmitter) sendDownloadProgressEvent() {
// registry lock already held
output := make(map[string]map[string]*pullerProgress)
for _, puller := range t.registry {
if output[puller.folder] == nil {
output[puller.folder] = make(map[string]*pullerProgress)
}
output[puller.folder][puller.file.Name] = puller.Progress()
}
events.Default.Log(events.DownloadProgress, output)
l.Debugf("progress emitter: emitting %#v", output)
}
func (t *ProgressEmitter) sendDownloadProgressMessages() {
// registry lock already held
sharedFolders := make(map[protocol.DeviceID][]string)
deviceConns := make(map[protocol.DeviceID]protocol.Connection)
subscribers := t.connections
for folder, conns := range subscribers {
for _, conn := range conns {
id := conn.ID()
deviceConns[id] = conn
sharedFolders[id] = append(sharedFolders[id], folder)
state, ok := t.sentDownloadStates[id]
if !ok {
state = &sentDownloadState{
folderStates: make(map[string]*sentFolderDownloadState),
}
t.sentDownloadStates[id] = state
}
var activePullers []*sharedPullerState
for _, puller := range t.registry {
if puller.folder != folder || puller.file.IsSymlink() || puller.file.IsDirectory() || len(puller.file.Blocks) <= t.minBlocks {
continue
}
activePullers = append(activePullers, puller)
}
// For every new puller that hasn't yet been seen, it will send all the blocks the puller has available
// For every existing puller, it will check for new blocks, and send update for the new blocks only
// For every puller that we've seen before but is no longer there, we will send a forget message
updates := state.update(folder, activePullers)
if len(updates) > 0 {
conn.DownloadProgress(folder, updates)
}
}
}
// Clean up sentDownloadStates for devices which we are no longer connected to.
for id := range t.sentDownloadStates {
_, ok := deviceConns[id]
if !ok {
// Null out outstanding entries for device
delete(t.sentDownloadStates, id)
}
}
// If a folder was unshared from some device, tell it that all temp files
// are now gone.
for id, sharedDeviceFolders := range sharedFolders {
state := t.sentDownloadStates[id]
nextFolder:
// For each of the folders that the state is aware of,
// try to match it with a shared folder we've discovered above,
for _, folder := range state.folders() {
for _, existingFolder := range sharedDeviceFolders {
if existingFolder == folder {
continue nextFolder
}
}
// If we fail to find that folder, we tell the state to forget about it
// and return us a list of updates which would clean up the state
// on the remote end.
updates := state.cleanup(folder)
if len(updates) > 0 {
// XXX: Don't send this now, as the only way we've unshared a folder
// is by breaking the connection and reconnecting, hence sending
// forget messages for some random folder currently makes no sense.
// deviceConns[id].DownloadProgress(folder, updates, 0, nil)
}
}
}
}
// VerifyConfiguration implements the config.Committer interface
func (t *ProgressEmitter) VerifyConfiguration(from, to config.Configuration) error {
return nil
}
// CommitConfiguration implements the config.Committer interface
func (t *ProgressEmitter) CommitConfiguration(from, to config.Configuration) bool {
t.mut.Lock()
defer t.mut.Unlock()
t.interval = time.Duration(to.Options.ProgressUpdateIntervalS) * time.Second
if t.interval < time.Second {
t.interval = time.Second
}
t.minBlocks = to.Options.TempIndexMinBlocks
l.Debugln("progress emitter: updated interval", t.interval)
return true
}
// Stop stops the emitter.
func (t *ProgressEmitter) Stop() {
t.stop <- struct{}{}
}
// Register a puller with the emitter which will start broadcasting pullers
// progress.
func (t *ProgressEmitter) Register(s *sharedPullerState) {
t.mut.Lock()
defer t.mut.Unlock()
l.Debugln("progress emitter: registering", s.folder, s.file.Name)
if len(t.registry) == 0 {
t.timer.Reset(t.interval)
}
t.registry[filepath.Join(s.folder, s.file.Name)] = s
}
// Deregister a puller which will stop broadcasting pullers state.
func (t *ProgressEmitter) Deregister(s *sharedPullerState) {
t.mut.Lock()
defer t.mut.Unlock()
l.Debugln("progress emitter: deregistering", s.folder, s.file.Name)
delete(t.registry, filepath.Join(s.folder, s.file.Name))
}
// BytesCompleted returns the number of bytes completed in the given folder.
func (t *ProgressEmitter) BytesCompleted(folder string) (bytes int64) {
t.mut.Lock()
defer t.mut.Unlock()
for _, s := range t.registry {
if s.folder == folder {
bytes += s.Progress().BytesDone
}
}
l.Debugf("progress emitter: bytes completed for %s: %d", folder, bytes)
return
}
func (t *ProgressEmitter) String() string {
return fmt.Sprintf("ProgressEmitter@%p", t)
}
func (t *ProgressEmitter) lenRegistry() int {
t.mut.Lock()
defer t.mut.Unlock()
return len(t.registry)
}
func (t *ProgressEmitter) temporaryIndexSubscribe(conn protocol.Connection, folders []string) {
t.mut.Lock()
for _, folder := range folders {
t.connections[folder] = append(t.connections[folder], conn)
}
t.mut.Unlock()
}
func (t *ProgressEmitter) temporaryIndexUnsubscribe(conn protocol.Connection) {
t.mut.Lock()
left := make(map[string][]protocol.Connection, len(t.connections))
for folder, conns := range t.connections {
connsLeft := connsWithout(conns, conn)
if len(connsLeft) > 0 {
left[folder] = connsLeft
}
}
t.connections = left
t.mut.Unlock()
}
func connsWithout(conns []protocol.Connection, conn protocol.Connection) []protocol.Connection {
if len(conns) == 0 {
return nil
}
newConns := make([]protocol.Connection, 0, len(conns)-1)
for _, existingConn := range conns {
if existingConn != conn {
newConns = append(newConns, existingConn)
}
}
return newConns
}