Refactor model into separate package

cmd/syncthing/debug.go

@@ -7,7 +7,4 @@ import (
 
 var (
 	debugNet = strings.Contains(os.Getenv("STTRACE"), "net") || os.Getenv("STTRACE") == "all"
-	debugIdx  = strings.Contains(os.Getenv("STTRACE"), "idx") || os.Getenv("STTRACE") == "all"
-	debugNeed = strings.Contains(os.Getenv("STTRACE"), "need") || os.Getenv("STTRACE") == "all"
-	debugPull = strings.Contains(os.Getenv("STTRACE"), "pull") || os.Getenv("STTRACE") == "all"
 )

cmd/syncthing/gui.go

@@ -16,6 +16,7 @@ import (
 	"code.google.com/p/go.crypto/bcrypt"
 	"github.com/calmh/syncthing/config"
 	"github.com/calmh/syncthing/logger"
+	"github.com/calmh/syncthing/model"
 	"github.com/codegangsta/martini"
 )
 
@@ -40,7 +41,7 @@ func init() {
 	l.AddHandler(logger.LevelWarn, showGuiError)
 }
 
-func startGUI(cfg config.GUIConfiguration, m *Model) error {
+func startGUI(cfg config.GUIConfiguration, m *model.Model) error {
 	listener, err := net.Listen("tcp", cfg.Address)
 	if err != nil {
 		return err
@@ -95,7 +96,7 @@ func restGetVersion() string {
 	return Version
 }
 
-func restGetModel(m *Model, w http.ResponseWriter, r *http.Request) {
+func restGetModel(m *model.Model, w http.ResponseWriter, r *http.Request) {
 	var qs = r.URL.Query()
 	var repo = qs.Get("repo")
 	var res = make(map[string]interface{})
@@ -124,7 +125,7 @@ func restGetModel(m *Model, w http.ResponseWriter, r *http.Request) {
 	json.NewEncoder(w).Encode(res)
 }
 
-func restGetConnections(m *Model, w http.ResponseWriter) {
+func restGetConnections(m *model.Model, w http.ResponseWriter) {
 	var res = m.ConnectionStats()
 	w.Header().Set("Content-Type", "application/json")
 	json.NewEncoder(w).Encode(res)

cmd/syncthing/main.go

@@ -23,13 +23,12 @@ import (
 	"github.com/calmh/syncthing/config"
 	"github.com/calmh/syncthing/discover"
 	"github.com/calmh/syncthing/logger"
+	"github.com/calmh/syncthing/model"
 	"github.com/calmh/syncthing/protocol"
 	"github.com/calmh/syncthing/upnp"
 	"github.com/juju/ratelimit"
 )
 
-const BlockSize = 128 * 1024
-
 var (
 	Version     = "unknown-dev"
 	BuildStamp  = "0"
@@ -75,15 +74,12 @@ const (
 
  STTRACE       A comma separated string of facilities to trace. The valid
                facility strings:
-               - "discover" (the node discovery package)
+               - "beacon"   (the beacon package)
-               - "files"    (file set store)
+               - "discover" (the discover package)
-               - "idx"      (index sending and receiving)
+               - "files"    (the files package)
-               - "mc"       (multicast beacon)
+               - "net"      (the main packge; connections & network messages)
-               - "need"     (file need calculations)
+               - "scanner"  (the scanner package)
-               - "net"      (connecting and disconnecting, network messages)
+               - "upnp"     (the upnp package)
-               - "pull"     (file pull activity)
-               - "scanner"  (the file change scanner)
-               - "upnp"     (the upnp port mapper)
                - "all"      (all of the above)
 
  STCPUPROFILE  Write CPU profile to the specified file.`
@@ -245,7 +241,7 @@ func main() {
 		rateBucket = ratelimit.NewBucketWithRate(float64(1000*cfg.Options.MaxSendKbps), int64(5*1000*cfg.Options.MaxSendKbps))
 	}
 
-	m := NewModel(cfg.Options.MaxChangeKbps * 1000)
+	m := model.NewModel(confDir, &cfg, "syncthing", Version)
 
 	for _, repo := range cfg.Repositories {
 		if repo.Invalid != "" {
@@ -313,6 +309,7 @@ func main() {
 		ensureDir(dir, -1)
 	}
 
+	m.CleanRepos()
 	m.ScanRepos()
 	m.SaveIndexes(confDir)
 
@@ -466,7 +463,7 @@ func saveConfigLoop(cfgFile string) {
 			continue
 		}
 
-		err = Rename(cfgFile+".tmp", cfgFile)
+		err = model.Rename(cfgFile+".tmp", cfgFile)
 		if err != nil {
 			l.Warnln(err)
 		}
@@ -477,7 +474,7 @@ func saveConfig() {
 	saveConfigCh <- struct{}{}
 }
 
-func listenConnect(myID string, m *Model, tlsCfg *tls.Config) {
+func listenConnect(myID string, m *model.Model, tlsCfg *tls.Config) {
 	var conns = make(chan *tls.Conn)
 
 	// Listen

config/config.go

@@ -57,7 +57,7 @@ type OptionsConfiguration struct {
 	MaxSendKbps        int      `xml:"maxSendKbps"`
 	RescanIntervalS    int      `xml:"rescanIntervalS" default:"60"`
 	ReconnectIntervalS int      `xml:"reconnectionIntervalS" default:"60"`
-	MaxChangeKbps      int      `xml:"maxChangeKbps" default:"1000"`
+	MaxChangeKbps      int      `xml:"maxChangeKbps" default:"10000"`
 	StartBrowser       bool     `xml:"startBrowser" default:"true"`
 	UPnPEnabled        bool     `xml:"upnpEnabled" default:"true"`
 

integration/h1/config.xml

@@ -35,7 +35,7 @@
         <maxSendKbps>0</maxSendKbps>
         <rescanIntervalS>10</rescanIntervalS>
         <reconnectionIntervalS>5</reconnectionIntervalS>
-        <maxChangeKbps>1000</maxChangeKbps>
+        <maxChangeKbps>10000</maxChangeKbps>
         <startBrowser>false</startBrowser>
     </options>
 </configuration>

integration/h2/config.xml

@@ -40,7 +40,7 @@
         <maxSendKbps>0</maxSendKbps>
         <rescanIntervalS>15</rescanIntervalS>
         <reconnectionIntervalS>5</reconnectionIntervalS>
-        <maxChangeKbps>1000</maxChangeKbps>
+        <maxChangeKbps>10000</maxChangeKbps>
         <startBrowser>false</startBrowser>
     </options>
 </configuration>

integration/h3/config.xml

@@ -32,7 +32,7 @@
         <maxSendKbps>0</maxSendKbps>
         <rescanIntervalS>20</rescanIntervalS>
         <reconnectionIntervalS>5</reconnectionIntervalS>
-        <maxChangeKbps>1000</maxChangeKbps>
+        <maxChangeKbps>10000</maxChangeKbps>
         <startBrowser>false</startBrowser>
     </options>
 </configuration>

integration/h4/config.xml

@@ -29,7 +29,7 @@
         <maxSendKbps>0</maxSendKbps>
         <rescanIntervalS>60</rescanIntervalS>
         <reconnectionIntervalS>10</reconnectionIntervalS>
-        <maxChangeKbps>1000</maxChangeKbps>
+        <maxChangeKbps>10000</maxChangeKbps>
         <startBrowser>false</startBrowser>
         <upnpEnabled>false</upnpEnabled>
     </options>

model/blockqueue.go

@@ -1,4 +1,4 @@
-package main
+package model
 
 import (
 	"sync/atomic"

model/debug.go

@@ -0,0 +1,13 @@
+package model
+
+import (
+	"os"
+	"strings"
+
+	"github.com/calmh/syncthing/logger"
+)
+
+var (
+	debug = strings.Contains(os.Getenv("STTRACE"), "model") || os.Getenv("STTRACE") == "all"
+	l     = logger.DefaultLogger
+)

model/model.go

@@ -1,4 +1,4 @@
-package main
+package model
 
 import (
 	"compress/gzip"
@@ -31,11 +31,18 @@ const (
 )
 
 type Model struct {
+	indexDir string
+	cfg      *config.Configuration
+
+	clientName    string
+	clientVersion string
+
 	repoDirs   map[string]string      // repo -> dir
 	repoFiles  map[string]*files.Set  // repo -> files
 	repoNodes  map[string][]string    // repo -> nodeIDs
 	nodeRepos  map[string][]string    // nodeID -> repos
 	repoState  map[string]repoState   // repo -> state
+	suppressor map[string]*suppressor // repo -> suppressor
 	rmut       sync.RWMutex           // protects the above
 
 	cm *cid.Map
@@ -59,18 +66,23 @@ var (
 // NewModel creates and starts a new model. The model starts in read-only mode,
 // where it sends index information to connected peers and responds to requests
 // for file data without altering the local repository in any way.
-func NewModel(maxChangeBw int) *Model {
+func NewModel(indexDir string, cfg *config.Configuration, clientName, clientVersion string) *Model {
 	m := &Model{
+		indexDir:      indexDir,
+		cfg:           cfg,
+		clientName:    clientName,
+		clientVersion: clientVersion,
 		repoDirs:      make(map[string]string),
 		repoFiles:     make(map[string]*files.Set),
 		repoNodes:     make(map[string][]string),
 		nodeRepos:     make(map[string][]string),
 		repoState:     make(map[string]repoState),
+		suppressor:    make(map[string]*suppressor),
 		cm:            cid.NewMap(),
 		protoConn:     make(map[string]protocol.Connection),
 		rawConn:       make(map[string]io.Closer),
 		nodeVer:       make(map[string]string),
-		sup:       suppressor{threshold: int64(maxChangeBw)},
+		sup:           suppressor{threshold: int64(cfg.Options.MaxChangeKbps)},
 	}
 
 	go m.broadcastIndexLoop()
@@ -87,7 +99,7 @@ func (m *Model) StartRepoRW(repo string, threads int) {
 	if dir, ok := m.repoDirs[repo]; !ok {
 		panic("cannot start without repo")
 	} else {
-		newPuller(repo, dir, m, threads)
+		newPuller(repo, dir, m, threads, m.cfg)
 	}
 }
 
@@ -214,7 +226,7 @@ func (m *Model) NeedFilesRepo(repo string) []scanner.File {
 // Index is called when a new node is connected and we receive their full index.
 // Implements the protocol.Model interface.
 func (m *Model) Index(nodeID string, repo string, fs []protocol.FileInfo) {
-	if debugNet {
+	if debug {
 		l.Debugf("IDX(in): %s / %q: %d files", nodeID, repo, len(fs))
 	}
 
@@ -237,7 +249,7 @@ func (m *Model) Index(nodeID string, repo string, fs []protocol.FileInfo) {
 // IndexUpdate is called for incremental updates to connected nodes' indexes.
 // Implements the protocol.Model interface.
 func (m *Model) IndexUpdate(nodeID string, repo string, fs []protocol.FileInfo) {
-	if debugNet {
+	if debug {
 		l.Debugf("IDXUP(in): %s / %q: %d files", nodeID, repo, len(fs))
 	}
 
@@ -259,7 +271,7 @@ func (m *Model) IndexUpdate(nodeID string, repo string, fs []protocol.FileInfo)
 
 func (m *Model) ClusterConfig(nodeID string, config protocol.ClusterConfigMessage) {
 	compErr := compareClusterConfig(m.clusterConfig(nodeID), config)
-	if debugNet {
+	if debug {
 		l.Debugf("ClusterConfig: %s: %#v", nodeID, config)
 		l.Debugf("  ... compare: %s: %v", nodeID, compErr)
 	}
@@ -281,7 +293,7 @@ func (m *Model) ClusterConfig(nodeID string, config protocol.ClusterConfigMessag
 // Close removes the peer from the model and closes the underlying connection if possible.
 // Implements the protocol.Model interface.
 func (m *Model) Close(node string, err error) {
-	if debugNet {
+	if debug {
 		l.Debugf("%s: %v", node, err)
 	}
 
@@ -329,13 +341,13 @@ func (m *Model) Request(nodeID, repo, name string, offset int64, size int) ([]by
 	}
 
 	if offset > lf.Size {
-		if debugNet {
+		if debug {
 			l.Debugf("REQ(in; nonexistent): %s: %q o=%d s=%d", nodeID, name, offset, size)
 		}
 		return nil, ErrNoSuchFile
 	}
 
-	if debugNet && nodeID != "<local>" {
+	if debug && nodeID != "<local>" {
 		l.Debugf("REQ(in): %s: %q / %q o=%d s=%d", nodeID, repo, name, offset, size)
 	}
 	m.rmut.RLock()
@@ -436,7 +448,7 @@ func (m *Model) AddConnection(rawConn io.Closer, protoConn protocol.Connection)
 
 	go func() {
 		for repo, idx := range idxToSend {
-			if debugNet {
+			if debug {
 				l.Debugf("IDX(out/initial): %s: %q: %d files", nodeID, repo, len(idx))
 			}
 			protoConn.Index(repo, idx)
@@ -452,7 +464,7 @@ func (m *Model) protocolIndex(repo string) []protocol.FileInfo {
 
 	for _, f := range fs {
 		mf := fileInfoFromFile(f)
-		if debugIdx {
+		if debug {
 			var flagComment string
 			if mf.Flags&protocol.FlagDeleted != 0 {
 				flagComment = " (deleted)"
@@ -480,7 +492,7 @@ func (m *Model) requestGlobal(nodeID, repo, name string, offset int64, size int,
 		return nil, fmt.Errorf("requestGlobal: no such node: %s", nodeID)
 	}
 
-	if debugNet {
+	if debug {
 		l.Debugf("REQ(out): %s: %q / %q o=%d s=%d h=%x", nodeID, repo, name, offset, size, hash)
 	}
 
@@ -503,13 +515,13 @@ func (m *Model) broadcastIndexLoop() {
 			lastChange[repo] = c
 
 			idx := m.protocolIndex(repo)
-			m.saveIndex(repo, confDir, idx)
+			m.saveIndex(repo, m.indexDir, idx)
 
 			var indexWg sync.WaitGroup
 			for _, nodeID := range m.repoNodes[repo] {
 				if conn, ok := m.protoConn[nodeID]; ok {
 					indexWg.Add(1)
-					if debugNet {
+					if debug {
 						l.Debugf("IDX(out/loop): %s: %d files", nodeID, len(idx))
 					}
 					go func() {
@@ -538,6 +550,7 @@ func (m *Model) AddRepo(id, dir string, nodes []config.NodeConfiguration) {
 	m.rmut.Lock()
 	m.repoDirs[id] = dir
 	m.repoFiles[id] = files.NewSet()
+	m.suppressor[id] = &suppressor{threshold: int64(m.cfg.Options.MaxChangeKbps)}
 
 	m.repoNodes[id] = make([]string, len(nodes))
 	for i, node := range nodes {
@@ -569,15 +582,37 @@ func (m *Model) ScanRepos() {
 	wg.Wait()
 }
 
+func (m *Model) CleanRepos() {
+	m.rmut.RLock()
+	var dirs = make([]string, 0, len(m.repoDirs))
+	for _, dir := range m.repoDirs {
+		dirs = append(dirs, dir)
+	}
+	m.rmut.RUnlock()
+
+	var wg sync.WaitGroup
+	wg.Add(len(dirs))
+	for _, dir := range dirs {
+		w := &scanner.Walker{
+			Dir:       dir,
+			TempNamer: defTempNamer,
+		}
+		go func() {
+			w.CleanTempFiles()
+			wg.Done()
+		}()
+	}
+	wg.Wait()
+}
+
 func (m *Model) ScanRepo(repo string) error {
-	sup := &suppressor{threshold: int64(cfg.Options.MaxChangeKbps)}
 	m.rmut.RLock()
 	w := &scanner.Walker{
 		Dir:          m.repoDirs[repo],
 		IgnoreFile:   ".stignore",
-		BlockSize:    BlockSize,
+		BlockSize:    scanner.StandardBlockSize,
 		TempNamer:    defTempNamer,
-		Suppressor:   sup,
+		Suppressor:   m.suppressor[repo],
 		CurrentFiler: cFiler{m, repo},
 	}
 	m.rmut.RUnlock()
@@ -660,8 +695,8 @@ func (m *Model) loadIndex(repo string, dir string) []protocol.FileInfo {
 // clusterConfig returns a ClusterConfigMessage that is correct for the given peer node
 func (m *Model) clusterConfig(node string) protocol.ClusterConfigMessage {
 	cm := protocol.ClusterConfigMessage{
-		ClientName:    "syncthing",
+		ClientName:    m.clientName,
-		ClientVersion: Version,
+		ClientVersion: m.clientVersion,
 	}
 
 	m.rmut.RLock()

model/model_test.go

@@ -1,4 +1,4 @@
-package main
+package model
 
 import (
 	"bytes"

model/puller.go

@@ -1,4 +1,4 @@
-package main
+package model
 
 import (
 	"bytes"
@@ -62,6 +62,7 @@ func (m activityMap) decrease(node string) {
 var errNoNode = errors.New("no available source node")
 
 type puller struct {
+	cfg               *config.Configuration
 	repo              string
 	dir               string
 	bq                *blockQueue
@@ -73,8 +74,9 @@ type puller struct {
 	requestResults    chan requestResult
 }
 
-func newPuller(repo, dir string, model *Model, slots int) *puller {
+func newPuller(repo, dir string, model *Model, slots int, cfg *config.Configuration) *puller {
 	p := &puller{
+		cfg:               cfg,
 		repo:              repo,
 		dir:               dir,
 		bq:                newBlockQueue(),
@@ -91,13 +93,13 @@ func newPuller(repo, dir string, model *Model, slots int) *puller {
 		for i := 0; i < slots; i++ {
 			p.requestSlots <- true
 		}
-		if debugPull {
+		if debug {
 			l.Debugf("starting puller; repo %q dir %q slots %d", repo, dir, slots)
 		}
 		go p.run()
 	} else {
 		// Read only
-		if debugPull {
+		if debug {
 			l.Debugf("starting puller; repo %q dir %q (read only)", repo, dir)
 		}
 		go p.runRO()
@@ -111,14 +113,14 @@ func (p *puller) run() {
 		for {
 			<-p.requestSlots
 			b := p.bq.get()
-			if debugPull {
+			if debug {
 				l.Debugf("filler: queueing %q / %q offset %d copy %d", p.repo, b.file.Name, b.block.Offset, len(b.copy))
 			}
 			p.blocks <- b
 		}
 	}()
 
-	walkTicker := time.Tick(time.Duration(cfg.Options.RescanIntervalS) * time.Second)
+	walkTicker := time.Tick(time.Duration(p.cfg.Options.RescanIntervalS) * time.Second)
 	timeout := time.Tick(5 * time.Second)
 	changed := true
 
@@ -146,7 +148,7 @@ func (p *puller) run() {
 					// Nothing more to do for the moment
 					break pull
 				}
-				if debugPull {
+				if debug {
 					l.Debugf("%q: idle but have %d open files", p.repo, len(p.openFiles))
 					i := 5
 					for _, f := range p.openFiles {
@@ -171,12 +173,12 @@ func (p *puller) run() {
 		// Do a rescan if it's time for it
 		select {
 		case <-walkTicker:
-			if debugPull {
+			if debug {
 				l.Debugf("%q: time for rescan", p.repo)
 			}
 			err := p.model.ScanRepo(p.repo)
 			if err != nil {
-				invalidateRepo(cfg, p.repo, err)
+				invalidateRepo(p.cfg, p.repo, err)
 				return
 			}
 
@@ -189,15 +191,15 @@ func (p *puller) run() {
 }
 
 func (p *puller) runRO() {
-	walkTicker := time.Tick(time.Duration(cfg.Options.RescanIntervalS) * time.Second)
+	walkTicker := time.Tick(time.Duration(p.cfg.Options.RescanIntervalS) * time.Second)
 
 	for _ = range walkTicker {
-		if debugPull {
+		if debug {
 			l.Debugf("%q: time for rescan", p.repo)
 		}
 		err := p.model.ScanRepo(p.repo)
 		if err != nil {
-			invalidateRepo(cfg, p.repo, err)
+			invalidateRepo(p.cfg, p.repo, err)
 			return
 		}
 	}
@@ -226,7 +228,7 @@ func (p *puller) fixupDirectories() {
 		}
 
 		if cur.Flags&protocol.FlagDeleted != 0 {
-			if debugPull {
+			if debug {
 				l.Debugf("queue delete dir: %v", cur)
 			}
 
@@ -240,7 +242,7 @@ func (p *puller) fixupDirectories() {
 
 		if cur.Flags&uint32(os.ModePerm) != uint32(info.Mode()&os.ModePerm) {
 			os.Chmod(path, os.FileMode(cur.Flags)&os.ModePerm)
-			if debugPull {
+			if debug {
 				l.Debugf("restored dir flags: %o -> %v", info.Mode()&os.ModePerm, cur)
 			}
 		}
@@ -248,7 +250,7 @@ func (p *puller) fixupDirectories() {
 		if cur.Modified != info.ModTime().Unix() {
 			t := time.Unix(cur.Modified, 0)
 			os.Chtimes(path, t, t)
-			if debugPull {
+			if debug {
 				l.Debugf("restored dir modtime: %d -> %v", info.ModTime().Unix(), cur)
 			}
 		}
@@ -258,7 +260,7 @@ func (p *puller) fixupDirectories() {
 
 	// Delete any queued directories
 	for i := len(deleteDirs) - 1; i >= 0; i-- {
-		if debugPull {
+		if debug {
 			l.Debugln("delete dir:", deleteDirs[i])
 		}
 		err := os.Remove(deleteDirs[i])
@@ -284,7 +286,7 @@ func (p *puller) handleRequestResult(res requestResult) {
 	of.outstanding--
 	p.openFiles[f.Name] = of
 
-	if debugPull {
+	if debug {
 		l.Debugf("pull: wrote %q / %q offset %d outstanding %d done %v", p.repo, f.Name, res.offset, of.outstanding, of.done)
 	}
 
@@ -314,7 +316,7 @@ func (p *puller) handleBlock(b bqBlock) bool {
 	of.done = b.last
 
 	if !ok {
-		if debugPull {
+		if debug {
 			l.Debugf("pull: %q: opening file %q", p.repo, f.Name)
 		}
 
@@ -333,7 +335,7 @@ func (p *puller) handleBlock(b bqBlock) bool {
 
 		of.file, of.err = os.Create(of.temp)
 		if of.err != nil {
-			if debugPull {
+			if debug {
 				l.Debugf("pull: error: %q / %q: %v", p.repo, f.Name, of.err)
 			}
 			if !b.last {
@@ -346,7 +348,7 @@ func (p *puller) handleBlock(b bqBlock) bool {
 
 	if of.err != nil {
 		// We have already failed this file.
-		if debugPull {
+		if debug {
 			l.Debugf("pull: error: %q / %q has already failed: %v", p.repo, f.Name, of.err)
 		}
 		if b.last {
@@ -378,14 +380,14 @@ func (p *puller) handleCopyBlock(b bqBlock) {
 	f := b.file
 	of := p.openFiles[f.Name]
 
-	if debugPull {
+	if debug {
 		l.Debugf("pull: copying %d blocks for %q / %q", len(b.copy), p.repo, f.Name)
 	}
 
 	var exfd *os.File
 	exfd, of.err = os.Open(of.filepath)
 	if of.err != nil {
-		if debugPull {
+		if debug {
 			l.Debugf("pull: error: %q / %q: %v", p.repo, f.Name, of.err)
 		}
 		of.file.Close()
@@ -404,7 +406,7 @@ func (p *puller) handleCopyBlock(b bqBlock) {
 		}
 		buffers.Put(bs)
 		if of.err != nil {
-			if debugPull {
+			if debug {
 				l.Debugf("pull: error: %q / %q: %v", p.repo, f.Name, of.err)
 			}
 			exfd.Close()
@@ -447,7 +449,7 @@ func (p *puller) handleRequestBlock(b bqBlock) bool {
 	p.openFiles[f.Name] = of
 
 	go func(node string, b bqBlock) {
-		if debugPull {
+		if debug {
 			l.Debugf("pull: requesting %q / %q offset %d size %d from %q outstanding %d", p.repo, f.Name, b.block.Offset, b.block.Size, node, of.outstanding)
 		}
 
@@ -476,13 +478,13 @@ func (p *puller) handleEmptyBlock(b bqBlock) {
 	}
 
 	if f.Flags&protocol.FlagDeleted != 0 {
-		if debugPull {
+		if debug {
 			l.Debugf("pull: delete %q", f.Name)
 		}
 		os.Remove(of.temp)
 		os.Remove(of.filepath)
 	} else {
-		if debugPull {
+		if debug {
 			l.Debugf("pull: no blocks to fetch and nothing to copy for %q / %q", p.repo, f.Name)
 		}
 		t := time.Unix(f.Modified, 0)
@@ -500,7 +502,7 @@ func (p *puller) queueNeededBlocks() {
 	for _, f := range p.model.NeedFilesRepo(p.repo) {
 		lf := p.model.CurrentRepoFile(p.repo, f.Name)
 		have, need := scanner.BlockDiff(lf.Blocks, f.Blocks)
-		if debugNeed {
+		if debug {
 			l.Debugf("need:\n  local: %v\n  global: %v\n  haveBlocks: %v\n  needBlocks: %v", lf, f, have, need)
 		}
 		queued++
@@ -510,13 +512,13 @@ func (p *puller) queueNeededBlocks() {
 			need: need,
 		})
 	}
-	if debugPull && queued > 0 {
+	if debug && queued > 0 {
 		l.Debugf("%q: queued %d blocks", p.repo, queued)
 	}
 }
 
 func (p *puller) closeFile(f scanner.File) {
-	if debugPull {
+	if debug {
 		l.Debugf("pull: closing %q / %q", p.repo, f.Name)
 	}
 
@@ -528,16 +530,16 @@ func (p *puller) closeFile(f scanner.File) {
 
 	fd, err := os.Open(of.temp)
 	if err != nil {
-		if debugPull {
+		if debug {
 			l.Debugf("pull: error: %q / %q: %v", p.repo, f.Name, err)
 		}
 		return
 	}
-	hb, _ := scanner.Blocks(fd, BlockSize)
+	hb, _ := scanner.Blocks(fd, scanner.StandardBlockSize)
 	fd.Close()
 
 	if l0, l1 := len(hb), len(f.Blocks); l0 != l1 {
-		if debugPull {
+		if debug {
 			l.Debugf("pull: %q / %q: nblocks %d != %d", p.repo, f.Name, l0, l1)
 		}
 		return
@@ -554,7 +556,7 @@ func (p *puller) closeFile(f scanner.File) {
 	os.Chtimes(of.temp, t, t)
 	os.Chmod(of.temp, os.FileMode(f.Flags&0777))
 	defTempNamer.Show(of.temp)
-	if debugPull {
+	if debug {
 		l.Debugf("pull: rename %q / %q: %q", p.repo, f.Name, of.filepath)
 	}
 	if err := Rename(of.temp, of.filepath); err == nil {
@@ -564,7 +566,7 @@ func (p *puller) closeFile(f scanner.File) {
 	}
 }
 
-func invalidateRepo(cfg config.Configuration, repoID string, err error) {
+func invalidateRepo(cfg *config.Configuration, repoID string, err error) {
 	for i := range cfg.Repositories {
 		repo := &cfg.Repositories[i]
 		if repo.ID == repoID {

model/suppressor.go

@@ -1,4 +1,4 @@
-package main
+package model
 
 import (
 	"os"
@@ -52,9 +52,8 @@ func (h *changeHistory) append(size int64, t time.Time) {
 	h.changes = append(h.changes, c)
 }
 
-func (s *suppressor) Suppress(name string, fi os.FileInfo) bool {
+func (s *suppressor) Suppress(name string, fi os.FileInfo) (cur, prev bool) {
-	sup, _ := s.suppress(name, fi.Size(), time.Now())
+	return s.suppress(name, fi.Size(), time.Now())
-	return sup
 }
 
 func (s *suppressor) suppress(name string, size int64, t time.Time) (bool, bool) {

model/suppressor_test.go

@@ -1,4 +1,4 @@
-package main
+package model
 
 import (
 	"testing"

model/tempname.go

@@ -1,6 +1,6 @@
 // +build !windows
 
-package main
+package model
 
 import (
 	"fmt"

model/tempname_windows.go

@@ -1,6 +1,6 @@
 // +build windows
 
-package main
+package model
 
 import (
 	"fmt"

model/util.go

@@ -1,4 +1,4 @@
-package main
+package model
 
 import (
 	"fmt"

scanner/blocks.go

@@ -6,6 +6,8 @@ import (
 	"io"
 )
 
+const StandardBlockSize = 128 * 1024
+
 type Block struct {
 	Offset int64
 	Size   uint32

scanner/walk.go

@@ -28,8 +28,6 @@ type Walker struct {
 	// Suppressed files will be returned with empty metadata and the Suppressed flag set.
 	// Requires CurrentFiler to be set.
 	Suppressor Suppressor
-
-	suppressed map[string]bool // file name -> suppression status
 }
 
 type TempNamer interface {
@@ -41,7 +39,7 @@ type TempNamer interface {
 
 type Suppressor interface {
 	// Supress returns true if the update to the named file should be ignored.
-	Suppress(name string, fi os.FileInfo) bool
+	Suppress(name string, fi os.FileInfo) (bool, bool)
 }
 
 type CurrentFiler interface {
@@ -52,8 +50,6 @@ type CurrentFiler interface {
 // Walk returns the list of files found in the local repository by scanning the
 // file system. Files are blockwise hashed.
 func (w *Walker) Walk() (files []File, ignore map[string][]string, err error) {
-	w.lazyInit()
-
 	if debug {
 		l.Debugln("Walk", w.Dir, w.BlockSize, w.IgnoreFile)
 	}
@@ -86,12 +82,6 @@ func (w *Walker) CleanTempFiles() {
 	filepath.Walk(w.Dir, w.cleanTempFile)
 }
 
-func (w *Walker) lazyInit() {
-	if w.suppressed == nil {
-		w.suppressed = make(map[string]bool)
-	}
-}
-
 func (w *Walker) loadIgnoreFiles(dir string, ign map[string][]string) filepath.WalkFunc {
 	return func(p string, info os.FileInfo, err error) error {
 		if err != nil {
@@ -203,21 +193,19 @@ func (w *Walker) walkAndHashFiles(res *[]File, ign map[string][]string) filepath
 					return nil
 				}
 
-				if w.Suppressor != nil && w.Suppressor.Suppress(rn, info) {
+				if w.Suppressor != nil {
-					if !w.suppressed[rn] {
+					if cur, prev := w.Suppressor.Suppress(rn, info); cur && !prev {
-						w.suppressed[rn] = true
 						l.Infof("Changes to %q are being temporarily suppressed because it changes too frequently.", p)
 						cf.Suppressed = true
 						cf.Version++
-					}
 						if debug {
 							l.Debugln("suppressed:", cf)
 						}
 						*res = append(*res, cf)
 						return nil
-				} else if w.suppressed[rn] {
+					} else if prev && !cur {
 						l.Infof("Changes to %q are no longer suppressed.", p)
-					delete(w.suppressed, rn)
+					}
 				}
 			}