mv internal lib

lib/model/rofolder.go

@@ -0,0 +1,164 @@
+// 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"
+	"math/rand"
+	"time"
+
+	"github.com/syncthing/syncthing/lib/sync"
+)
+
+type roFolder struct {
+	stateTracker
+
+	folder    string
+	intv      time.Duration
+	timer     *time.Timer
+	model     *Model
+	stop      chan struct{}
+	scanNow   chan rescanRequest
+	delayScan chan time.Duration
+}
+
+type rescanRequest struct {
+	subs []string
+	err  chan error
+}
+
+func newROFolder(model *Model, folder string, interval time.Duration) *roFolder {
+	return &roFolder{
+		stateTracker: stateTracker{
+			folder: folder,
+			mut:    sync.NewMutex(),
+		},
+		folder:    folder,
+		intv:      interval,
+		timer:     time.NewTimer(time.Millisecond),
+		model:     model,
+		stop:      make(chan struct{}),
+		scanNow:   make(chan rescanRequest),
+		delayScan: make(chan time.Duration),
+	}
+}
+
+func (s *roFolder) Serve() {
+	if debug {
+		l.Debugln(s, "starting")
+		defer l.Debugln(s, "exiting")
+	}
+
+	defer func() {
+		s.timer.Stop()
+	}()
+
+	reschedule := func() {
+		if s.intv == 0 {
+			return
+		}
+		// Sleep a random time between 3/4 and 5/4 of the configured interval.
+		sleepNanos := (s.intv.Nanoseconds()*3 + rand.Int63n(2*s.intv.Nanoseconds())) / 4
+		s.timer.Reset(time.Duration(sleepNanos) * time.Nanosecond)
+	}
+
+	initialScanCompleted := false
+	for {
+		select {
+		case <-s.stop:
+			return
+
+		case <-s.timer.C:
+			if err := s.model.CheckFolderHealth(s.folder); err != nil {
+				l.Infoln("Skipping folder", s.folder, "scan due to folder error:", err)
+				reschedule()
+				continue
+			}
+
+			if debug {
+				l.Debugln(s, "rescan")
+			}
+
+			if err := s.model.internalScanFolderSubs(s.folder, nil); err != nil {
+				// Potentially sets the error twice, once in the scanner just
+				// by doing a check, and once here, if the error returned is
+				// the same one as returned by CheckFolderHealth, though
+				// duplicate set is handled by setError.
+				s.setError(err)
+				reschedule()
+				continue
+			}
+
+			if !initialScanCompleted {
+				l.Infoln("Completed initial scan (ro) of folder", s.folder)
+				initialScanCompleted = true
+			}
+
+			if s.intv == 0 {
+				continue
+			}
+
+			reschedule()
+
+		case req := <-s.scanNow:
+			if err := s.model.CheckFolderHealth(s.folder); err != nil {
+				l.Infoln("Skipping folder", s.folder, "scan due to folder error:", err)
+				req.err <- err
+				continue
+			}
+
+			if debug {
+				l.Debugln(s, "forced rescan")
+			}
+
+			if err := s.model.internalScanFolderSubs(s.folder, req.subs); err != nil {
+				// Potentially sets the error twice, once in the scanner just
+				// by doing a check, and once here, if the error returned is
+				// the same one as returned by CheckFolderHealth, though
+				// duplicate set is handled by setError.
+				s.setError(err)
+				req.err <- err
+				continue
+			}
+
+			req.err <- nil
+
+		case next := <-s.delayScan:
+			s.timer.Reset(next)
+		}
+	}
+}
+
+func (s *roFolder) Stop() {
+	close(s.stop)
+}
+
+func (s *roFolder) IndexUpdated() {
+}
+
+func (s *roFolder) Scan(subs []string) error {
+	req := rescanRequest{
+		subs: subs,
+		err:  make(chan error),
+	}
+	s.scanNow <- req
+	return <-req.err
+}
+
+func (s *roFolder) String() string {
+	return fmt.Sprintf("roFolder/%s@%p", s.folder, s)
+}
+
+func (s *roFolder) BringToFront(string) {}
+
+func (s *roFolder) Jobs() ([]string, []string) {
+	return nil, nil
+}
+
+func (s *roFolder) DelayScan(next time.Duration) {
+	s.delayScan <- next
+}