// 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 rc provides remote control of a Syncthing process via the REST API. package rc import ( "bufio" "bytes" "encoding/json" "errors" "fmt" "io" "io/ioutil" "log" "net/http" "os" "os/exec" "path/filepath" stdsync "sync" "time" "github.com/syncthing/protocol" "github.com/syncthing/syncthing/internal/config" "github.com/syncthing/syncthing/internal/sync" ) // We set the API key via the STGUIAPIKEY variable when we launch the binary, // to ensure that we have API access regardless of authentication settings. const APIKey = "592A47BC-A7DF-4C2F-89E0-A80B3E5094EE" type Process struct { // Set at initialization addr string // Set by eventLoop() eventMut sync.Mutex id protocol.DeviceID folders []string startComplete bool startCompleteCond *stdsync.Cond stop bool localVersion map[string]map[string]int64 // Folder ID => Device ID => LocalVersion done map[string]bool // Folder ID => 100% cmd *exec.Cmd logfd *os.File } // NewProcess returns a new Process talking to Syncthing at the specified address. // Example: NewProcess("127.0.0.1:8082") func NewProcess(addr string) *Process { p := &Process{ addr: addr, localVersion: make(map[string]map[string]int64), done: make(map[string]bool), eventMut: sync.NewMutex(), } p.startCompleteCond = stdsync.NewCond(p.eventMut) return p } // LogTo creates the specified log file and ensures that stdout and stderr // from the Start()ed process is redirected there. Must be called before // Start(). func (p *Process) LogTo(filename string) error { if p.cmd != nil { panic("logfd cannot be set with an existing cmd") } if p.logfd != nil { p.logfd.Close() } fd, err := os.Create(filename) if err != nil { return err } p.logfd = fd return nil } // Start runs the specified Syncthing binary with the given arguments. // Syncthing should be configured to provide an API on the address given to // NewProcess. Event processing is started. func (p *Process) Start(bin string, args ...string) error { cmd := exec.Command(bin, args...) if p.logfd != nil { cmd.Stdout = p.logfd cmd.Stderr = p.logfd } cmd.Env = append(os.Environ(), "STNORESTART=1", "STGUIAPIKEY="+APIKey) err := cmd.Start() if err != nil { return err } p.cmd = cmd go p.eventLoop() return nil } // AwaitStartup waits for the Syncthing process to start and perform initial // scans of all folders. func (p *Process) AwaitStartup() { p.eventMut.Lock() for !p.startComplete { p.startCompleteCond.Wait() } p.eventMut.Unlock() return } // Stop stops the running Syncthing process. If the process was logging to a // local file (set by LogTo), the log file will be opened and checked for // panics and data races. The presence of either will be signalled in the form // of a returned error. func (p *Process) Stop() (*os.ProcessState, error) { p.eventMut.Lock() if p.stop { p.eventMut.Unlock() return p.cmd.ProcessState, nil } p.stop = true p.eventMut.Unlock() if err := p.cmd.Process.Signal(os.Kill); err != nil { return nil, err } p.cmd.Wait() var err error if p.logfd != nil { err = p.checkForProblems(p.logfd) } return p.cmd.ProcessState, err } // Get performs an HTTP GET and returns the bytes and/or an error. Any non-200 // return code is returned as an error. func (p *Process) Get(path string) ([]byte, error) { client := &http.Client{ Timeout: 30 * time.Second, Transport: &http.Transport{ DisableKeepAlives: true, }, } url := fmt.Sprintf("http://%s%s", p.addr, path) req, err := http.NewRequest("GET", url, nil) if err != nil { return nil, err } req.Header.Add("X-API-Key", APIKey) resp, err := client.Do(req) if err != nil { return nil, err } return p.readResponse(resp) } // Post performs an HTTP POST and returns the bytes and/or an error. Any // non-200 return code is returned as an error. func (p *Process) Post(path string, data io.Reader) ([]byte, error) { client := &http.Client{ Timeout: 600 * time.Second, Transport: &http.Transport{ DisableKeepAlives: true, }, } url := fmt.Sprintf("http://%s%s", p.addr, path) req, err := http.NewRequest("POST", url, data) if err != nil { return nil, err } req.Header.Add("X-API-Key", APIKey) req.Header.Add("Content-Type", "application/json") resp, err := client.Do(req) if err != nil { return nil, err } return p.readResponse(resp) } type Event struct { ID int Time time.Time Type string Data interface{} } func (p *Process) Events(since int) ([]Event, error) { bs, err := p.Get(fmt.Sprintf("/rest/events?since=%d", since)) if err != nil { return nil, err } var evs []Event dec := json.NewDecoder(bytes.NewReader(bs)) dec.UseNumber() err = dec.Decode(&evs) if err != nil { return nil, fmt.Errorf("Events: %s in %q", err, bs) } return evs, err } func (p *Process) Rescan(folder string) error { _, err := p.Post("/rest/db/scan?folder="+folder, nil) return err } func (p *Process) RescanDelay(folder string, delaySeconds int) error { _, err := p.Post(fmt.Sprintf("/rest/db/scan?folder=%s&next=%d", folder, delaySeconds), nil) return err } func InSync(folder string, ps ...*Process) bool { for _, p := range ps { p.eventMut.Lock() } defer func() { for _, p := range ps { p.eventMut.Unlock() } }() for i := range ps { // If our latest FolderSummary didn't report 100%, then we are not done. if !ps[i].done[folder] { return false } // Check LocalVersion for each device. The local version seen by remote // devices should be the same as what it has locally, or the index // hasn't been sent yet. sourceID := ps[i].id.String() sourceVersion := ps[i].localVersion[folder][sourceID] for j := range ps { if i != j { remoteVersion := ps[j].localVersion[folder][sourceID] if remoteVersion != sourceVersion { return false } } } } return true } func AwaitSync(folder string, ps ...*Process) { for { time.Sleep(250 * time.Millisecond) if InSync(folder, ps...) { return } } } type Model struct { GlobalBytes int GlobalDeleted int GlobalFiles int InSyncBytes int InSyncFiles int Invalid string LocalBytes int LocalDeleted int LocalFiles int NeedBytes int NeedFiles int State string StateChanged time.Time Version int } func (p *Process) Model(folder string) (Model, error) { bs, err := p.Get("/rest/db/status?folder=" + folder) if err != nil { return Model{}, err } var res Model if err := json.Unmarshal(bs, &res); err != nil { return Model{}, err } if debug { l.Debugf("%+v", res) } return res, nil } func (p *Process) readResponse(resp *http.Response) ([]byte, error) { bs, err := ioutil.ReadAll(resp.Body) resp.Body.Close() if err != nil { return bs, err } if resp.StatusCode != 200 { return bs, fmt.Errorf("%s", resp.Status) } return bs, nil } func (p *Process) checkForProblems(logfd *os.File) error { fd, err := os.Open(logfd.Name()) if err != nil { return err } defer fd.Close() raceConditionStart := []byte("WARNING: DATA RACE") raceConditionSep := []byte("==================") panicConditionStart := []byte("panic:") panicConditionSep := []byte(p.id.String()[:5]) sc := bufio.NewScanner(fd) race := false _panic := false for sc.Scan() { line := sc.Bytes() if race || _panic { if bytes.Contains(line, panicConditionSep) { _panic = false continue } fmt.Printf("%s\n", line) if bytes.Contains(line, raceConditionSep) { race = false } } else if bytes.Contains(line, raceConditionStart) { fmt.Printf("%s\n", raceConditionSep) fmt.Printf("%s\n", raceConditionStart) race = true if err == nil { err = errors.New("Race condition detected") } } else if bytes.Contains(line, panicConditionStart) { _panic = true if err == nil { err = errors.New("Panic detected") } } } return err } func (p *Process) eventLoop() { since := 0 notScanned := make(map[string]struct{}) start := time.Now() for { p.eventMut.Lock() if p.stop { p.eventMut.Unlock() return } p.eventMut.Unlock() time.Sleep(250 * time.Millisecond) events, err := p.Events(since) if err != nil { if time.Since(start) < 5*time.Second { // The API has probably not started yet, lets give it some time. continue } // If we're stopping, no need to print the error. p.eventMut.Lock() if p.stop { p.eventMut.Unlock() return } p.eventMut.Unlock() log.Println("eventLoop: events:", err) continue } since = events[len(events)-1].ID for _, ev := range events { switch ev.Type { case "Starting": // The Starting event tells us where the configuration is. Load // it and populate our list of folders. data := ev.Data.(map[string]interface{}) id, err := protocol.DeviceIDFromString(data["myID"].(string)) if err != nil { log.Println("eventLoop: DeviceIdFromString:", err) continue } p.id = id home := data["home"].(string) w, err := config.Load(filepath.Join(home, "config.xml"), protocol.LocalDeviceID) if err != nil { log.Println("eventLoop: Starting:", err) continue } for id := range w.Folders() { p.eventMut.Lock() p.folders = append(p.folders, id) p.eventMut.Unlock() notScanned[id] = struct{}{} } case "StateChanged": // When a folder changes to idle, we tick it off by removing // it from p.notScanned. if !p.startComplete { data := ev.Data.(map[string]interface{}) to := data["to"].(string) if to == "idle" { folder := data["folder"].(string) delete(notScanned, folder) if len(notScanned) == 0 { p.eventMut.Lock() p.startComplete = true p.startCompleteCond.Broadcast() p.eventMut.Unlock() } } } case "LocalIndexUpdated": data := ev.Data.(map[string]interface{}) folder := data["folder"].(string) version, _ := data["version"].(json.Number).Int64() p.eventMut.Lock() m := p.localVersion[folder] if m == nil { m = make(map[string]int64) } m[p.id.String()] = version p.localVersion[folder] = m p.done[folder] = false if debug { l.Debugf("LocalIndexUpdated %v %v done=false\n\t%+v", p.id, folder, m) } p.eventMut.Unlock() case "RemoteIndexUpdated": data := ev.Data.(map[string]interface{}) device := data["device"].(string) folder := data["folder"].(string) version, _ := data["version"].(json.Number).Int64() p.eventMut.Lock() m := p.localVersion[folder] if m == nil { m = make(map[string]int64) } m[device] = version p.localVersion[folder] = m p.done[folder] = false if debug { l.Debugf("RemoteIndexUpdated %v %v done=false\n\t%+v", p.id, folder, m) } p.eventMut.Unlock() case "FolderSummary": data := ev.Data.(map[string]interface{}) folder := data["folder"].(string) summary := data["summary"].(map[string]interface{}) need, _ := summary["needBytes"].(json.Number).Int64() done := need == 0 p.eventMut.Lock() p.done[folder] = done if debug { l.Debugf("Foldersummary %v %v\n\t%+v", p.id, folder, p.done) } p.eventMut.Unlock() } } } }