syncthing/lib/model/folder_summary.go

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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 https://mozilla.org/MPL/2.0/.
package model
import (
"fmt"
"strings"
"time"
"github.com/syncthing/syncthing/lib/config"
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"github.com/syncthing/syncthing/lib/events"
"github.com/syncthing/syncthing/lib/protocol"
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"github.com/syncthing/syncthing/lib/sync"
"github.com/thejerf/suture"
)
const minSummaryInterval = time.Minute
type FolderSummaryService interface {
suture.Service
Summary(folder string) (map[string]interface{}, error)
OnEventRequest()
}
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// The folderSummaryService adds summary information events (FolderSummary and
// FolderCompletion) into the event stream at certain intervals.
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type folderSummaryService struct {
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*suture.Supervisor
cfg config.Wrapper
model Model
id protocol.DeviceID
stop chan struct{}
immediate chan string
// For keeping track of folders to recalculate for
foldersMut sync.Mutex
folders map[string]struct{}
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// For keeping track of when the last event request on the API was
lastEventReq time.Time
lastEventReqMut sync.Mutex
}
func NewFolderSummaryService(cfg config.Wrapper, m Model, id protocol.DeviceID) FolderSummaryService {
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service := &folderSummaryService{
Supervisor: suture.New("folderSummaryService", suture.Spec{
PassThroughPanics: true,
}),
cfg: cfg,
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model: m,
id: id,
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stop: make(chan struct{}),
immediate: make(chan string),
folders: make(map[string]struct{}),
foldersMut: sync.NewMutex(),
lastEventReqMut: sync.NewMutex(),
}
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service.Add(serviceFunc(service.listenForUpdates))
service.Add(serviceFunc(service.calculateSummaries))
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return service
}
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func (c *folderSummaryService) Stop() {
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c.Supervisor.Stop()
close(c.stop)
}
func (c *folderSummaryService) String() string {
return fmt.Sprintf("FolderSummaryService@%p", c)
}
func (c *folderSummaryService) Summary(folder string) (map[string]interface{}, error) {
var res = make(map[string]interface{})
errors, err := c.model.FolderErrors(folder)
if err != nil && err != ErrFolderPaused {
// Stats from the db can still be obtained if the folder is just paused
return nil, err
}
res["errors"] = len(errors)
res["pullErrors"] = len(errors) // deprecated
res["invalid"] = "" // Deprecated, retains external API for now
global := c.model.GlobalSize(folder)
res["globalFiles"], res["globalDirectories"], res["globalSymlinks"], res["globalDeleted"], res["globalBytes"], res["globalTotalItems"] = global.Files, global.Directories, global.Symlinks, global.Deleted, global.Bytes, global.TotalItems()
local := c.model.LocalSize(folder)
res["localFiles"], res["localDirectories"], res["localSymlinks"], res["localDeleted"], res["localBytes"], res["localTotalItems"] = local.Files, local.Directories, local.Symlinks, local.Deleted, local.Bytes, local.TotalItems()
need := c.model.NeedSize(folder)
res["needFiles"], res["needDirectories"], res["needSymlinks"], res["needDeletes"], res["needBytes"], res["needTotalItems"] = need.Files, need.Directories, need.Symlinks, need.Deleted, need.Bytes, need.TotalItems()
if c.cfg.Folders()[folder].Type == config.FolderTypeReceiveOnly {
// Add statistics for things that have changed locally in a receive
// only folder.
ro := c.model.ReceiveOnlyChangedSize(folder)
res["receiveOnlyChangedFiles"] = ro.Files
res["receiveOnlyChangedDirectories"] = ro.Directories
res["receiveOnlyChangedSymlinks"] = ro.Symlinks
res["receiveOnlyChangedDeletes"] = ro.Deleted
res["receiveOnlyChangedBytes"] = ro.Bytes
res["receiveOnlyTotalItems"] = ro.TotalItems()
}
res["inSyncFiles"], res["inSyncBytes"] = global.Files-need.Files, global.Bytes-need.Bytes
res["state"], res["stateChanged"], err = c.model.State(folder)
if err != nil {
res["error"] = err.Error()
}
ourSeq, _ := c.model.CurrentSequence(folder)
remoteSeq, _ := c.model.RemoteSequence(folder)
res["version"] = ourSeq + remoteSeq // legacy
res["sequence"] = ourSeq + remoteSeq // new name
ignorePatterns, _, _ := c.model.GetIgnores(folder)
res["ignorePatterns"] = false
for _, line := range ignorePatterns {
if len(line) > 0 && !strings.HasPrefix(line, "//") {
res["ignorePatterns"] = true
break
}
}
err = c.model.WatchError(folder)
if err != nil {
res["watchError"] = err.Error()
}
return res, nil
}
func (c *folderSummaryService) OnEventRequest() {
c.lastEventReqMut.Lock()
c.lastEventReq = time.Now()
c.lastEventReqMut.Unlock()
}
// listenForUpdates subscribes to the event bus and makes note of folders that
// need their data recalculated.
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func (c *folderSummaryService) listenForUpdates() {
sub := events.Default.Subscribe(events.LocalIndexUpdated | events.RemoteIndexUpdated | events.StateChanged | events.RemoteDownloadProgress | events.DeviceConnected | events.FolderWatchStateChanged)
defer events.Default.Unsubscribe(sub)
for {
// This loop needs to be fast so we don't miss too many events.
select {
case ev := <-sub.C():
if ev.Type == events.DeviceConnected {
// When a device connects we schedule a refresh of all
// folders shared with that device.
data := ev.Data.(map[string]string)
deviceID, _ := protocol.DeviceIDFromString(data["id"])
c.foldersMut.Lock()
nextFolder:
for _, folder := range c.cfg.Folders() {
for _, dev := range folder.Devices {
if dev.DeviceID == deviceID {
c.folders[folder.ID] = struct{}{}
continue nextFolder
}
}
}
c.foldersMut.Unlock()
continue
}
// The other events all have a "folder" attribute that they
// affect. Whenever the local or remote index is updated for a
// given folder we make a note of it.
data := ev.Data.(map[string]interface{})
folder := data["folder"].(string)
switch ev.Type {
case events.StateChanged:
if data["to"].(string) == "idle" && data["from"].(string) == "syncing" {
// The folder changed to idle from syncing. We should do an
// immediate refresh to update the GUI. The send to
// c.immediate must be nonblocking so that we can continue
// handling events.
c.foldersMut.Lock()
select {
case c.immediate <- folder:
delete(c.folders, folder)
default:
c.folders[folder] = struct{}{}
}
c.foldersMut.Unlock()
}
default:
// This folder needs to be refreshed whenever we do the next
// refresh.
c.foldersMut.Lock()
c.folders[folder] = struct{}{}
c.foldersMut.Unlock()
}
case <-c.stop:
return
}
}
}
// calculateSummaries periodically recalculates folder summaries and
// completion percentage, and sends the results on the event bus.
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func (c *folderSummaryService) calculateSummaries() {
const pumpInterval = 2 * time.Second
pump := time.NewTimer(pumpInterval)
for {
select {
case <-pump.C:
t0 := time.Now()
for _, folder := range c.foldersToHandle() {
c.sendSummary(folder)
}
// We don't want to spend all our time calculating summaries. Lets
// set an arbitrary limit at not spending more than about 30% of
// our time here...
wait := 2*time.Since(t0) + pumpInterval
pump.Reset(wait)
case folder := <-c.immediate:
c.sendSummary(folder)
case <-c.stop:
return
}
}
}
// foldersToHandle returns the list of folders needing a summary update, and
// clears the list.
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func (c *folderSummaryService) foldersToHandle() []string {
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// We only recalculate summaries if someone is listening to events
// (a request to /rest/events has been made within the last
// pingEventInterval).
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c.lastEventReqMut.Lock()
last := c.lastEventReq
c.lastEventReqMut.Unlock()
if time.Since(last) > minSummaryInterval {
return nil
}
c.foldersMut.Lock()
res := make([]string, 0, len(c.folders))
for folder := range c.folders {
res = append(res, folder)
delete(c.folders, folder)
}
c.foldersMut.Unlock()
return res
}
// sendSummary send the summary events for a single folder
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func (c *folderSummaryService) sendSummary(folder string) {
// The folder summary contains how many bytes, files etc
// are in the folder and how in sync we are.
data, err := c.Summary(folder)
if err != nil {
return
}
events.Default.Log(events.FolderSummary, map[string]interface{}{
"folder": folder,
"summary": data,
})
for _, devCfg := range c.cfg.Folders()[folder].Devices {
if devCfg.DeviceID.Equals(c.id) {
// We already know about ourselves.
continue
}
if _, ok := c.model.Connection(devCfg.DeviceID); !ok {
// We're not interested in disconnected devices.
continue
}
// Get completion percentage of this folder for the
// remote device.
comp := c.model.Completion(devCfg.DeviceID, folder).Map()
comp["folder"] = folder
comp["device"] = devCfg.DeviceID.String()
events.Default.Log(events.FolderCompletion, comp)
}
}
// serviceFunc wraps a function to create a suture.Service without stop
// functionality.
type serviceFunc func()
func (f serviceFunc) Serve() { f() }
func (f serviceFunc) Stop() {}