Remove the last of the "config dir" stuff

This just conflates the Client. It should be done orthogonally.

client.go

@@ -13,8 +13,6 @@ import (
 	mathRand "math/rand"
 	"net"
 	"net/url"
-	"os"
-	"path/filepath"
 	"sort"
 	"strconv"
 	"strings"
@@ -180,19 +178,6 @@ func (cl *Client) WriteStatus(_w io.Writer) {
 	}
 }
 
-func (cl *Client) configDir() string {
-	if cl.config.ConfigDir == "" {
-		return filepath.Join(os.Getenv("HOME"), ".config/torrent")
-	}
-	return cl.config.ConfigDir
-}
-
-// The directory where the Client expects to find and store configuration
-// data. Defaults to $HOME/.config/torrent.
-func (cl *Client) ConfigDir() string {
-	return cl.configDir()
-}
-
 // Creates a new client.
 func NewClient(cfg *Config) (cl *Client, err error) {
 	if cfg == nil {
@@ -1442,45 +1427,11 @@ func (cl *Client) addPeers(t *Torrent, peers []Peer) {
 	}
 }
 
-func (cl *Client) cachedMetaInfoFilename(ih metainfo.Hash) string {
-	return filepath.Join(cl.configDir(), "torrents", ih.HexString()+".torrent")
-}
-
-func (cl *Client) saveTorrentFile(t *Torrent) error {
-	path := cl.cachedMetaInfoFilename(t.infoHash)
-	os.MkdirAll(filepath.Dir(path), 0777)
-	f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
-	if err != nil {
-		return fmt.Errorf("error opening file: %s", err)
-	}
-	defer f.Close()
-	e := bencode.NewEncoder(f)
-	err = e.Encode(t.metainfo())
-	if err != nil {
-		return fmt.Errorf("error marshalling metainfo: %s", err)
-	}
-	mi, err := cl.torrentCacheMetaInfo(t.infoHash)
-	if err != nil {
-		// For example, a script kiddy makes us load too many files, and we're
-		// able to save the torrent, but not load it again to check it.
-		return nil
-	}
-	if mi.Info.Hash() != t.infoHash {
-		log.Fatalf("%x != %x", mi.Info.Hash, t.infoHash[:])
-	}
-	return nil
-}
-
 func (cl *Client) setMetaData(t *Torrent, md *metainfo.Info, bytes []byte) (err error) {
 	err = t.setMetadata(md, bytes)
 	if err != nil {
 		return
 	}
-	if !cl.config.DisableMetainfoCache {
-		if err := cl.saveTorrentFile(t); err != nil {
-			log.Printf("error saving torrent file for %s: %s", t, err)
-		}
-	}
 	cl.event.Broadcast()
 	close(t.gotMetainfo)
 	return
@@ -1551,32 +1502,6 @@ type Handle interface {
 	io.ReaderAt
 }
 
-// Returns nil metainfo if it isn't in the cache. Checks that the retrieved
-// metainfo has the correct infohash.
-func (cl *Client) torrentCacheMetaInfo(ih metainfo.Hash) (mi *metainfo.MetaInfo, err error) {
-	if cl.config.DisableMetainfoCache {
-		return
-	}
-	f, err := os.Open(cl.cachedMetaInfoFilename(ih))
-	if err != nil {
-		if os.IsNotExist(err) {
-			err = nil
-		}
-		return
-	}
-	defer f.Close()
-	dec := bencode.NewDecoder(f)
-	err = dec.Decode(&mi)
-	if err != nil {
-		return
-	}
-	if mi.Info.Hash() != ih {
-		err = fmt.Errorf("cached torrent has wrong infohash: %x != %x", mi.Info.Hash, ih[:])
-		return
-	}
-	return
-}
-
 // Specifies a new torrent for adding to a client. There are helpers for
 // magnet URIs and torrent metainfo files.
 type TorrentSpec struct {
@@ -1655,20 +1580,8 @@ func (cl *Client) AddTorrentSpec(spec *TorrentSpec) (t *Torrent, new bool, err e
 	}
 	// Try to merge in info we have on the torrent. Any err left will
 	// terminate the function.
-	if t.info == nil {
+	if t.info == nil && spec.Info != nil {
-		if spec.Info != nil {
 		err = cl.setMetaData(t, &spec.Info.Info, spec.Info.Bytes)
-		} else {
-			var mi *metainfo.MetaInfo
-			mi, err = cl.torrentCacheMetaInfo(spec.InfoHash)
-			if err != nil {
-				log.Printf("error getting cached metainfo: %s", err)
-				err = nil
-			} else if mi != nil {
-				t.addTrackers(mi.AnnounceList)
-				err = cl.setMetaData(t, &mi.Info.Info, mi.Info.Bytes)
-			}
-		}
 	}
 	if err != nil {
 		return

client_test.go

@@ -10,7 +10,6 @@ import (
 	"math/rand"
 	"net"
 	"os"
-	"path/filepath"
 	"strings"
 	"sync"
 	"testing"
@@ -40,7 +39,6 @@ var TestingConfig = Config{
 	ListenAddr:      "localhost:0",
 	NoDHT:           true,
 	DisableTrackers: true,
-	DisableMetainfoCache: true,
 	DataDir:         "/dev/null",
 	DHTConfig: dht.ServerConfig{
 		NoDefaultBootstrap: true,
@@ -646,37 +644,6 @@ func TestAddTorrentSpecMerging(t *testing.T) {
 	require.NotNil(t, tt.Info())
 }
 
-// Check that torrent Info is obtained from the metainfo file cache.
-func TestAddTorrentMetainfoInCache(t *testing.T) {
-	cfg := TestingConfig
-	cfg.DisableMetainfoCache = false
-	cfg.ConfigDir, _ = ioutil.TempDir(os.TempDir(), "")
-	defer os.RemoveAll(cfg.ConfigDir)
-	cl, err := NewClient(&cfg)
-	require.NoError(t, err)
-	defer cl.Close()
-	dir, mi := testutil.GreetingTestTorrent()
-	defer os.RemoveAll(dir)
-	tt, new, err := cl.AddTorrentSpec(TorrentSpecFromMetaInfo(mi))
-	require.NoError(t, err)
-	require.True(t, new)
-	require.NotNil(t, tt.Info())
-	_, err = os.Stat(filepath.Join(cfg.ConfigDir, "torrents", fmt.Sprintf("%x.torrent", mi.Info.Hash())))
-	require.NoError(t, err)
-	_, ok := cl.Torrent(mi.Info.Hash())
-	require.True(t, ok)
-	tt.Drop()
-	_, ok = cl.Torrent(mi.Info.Hash())
-	require.False(t, ok)
-	tt, new, err = cl.AddTorrentSpec(&TorrentSpec{
-		InfoHash: mi.Info.Hash(),
-	})
-	require.NoError(t, err)
-	require.True(t, new)
-	// Obtained from the metainfo cache.
-	require.NotNil(t, tt.Info())
-}
-
 func TestTorrentDroppedBeforeGotInfo(t *testing.T) {
 	dir, mi := testutil.GreetingTestTorrent()
 	os.RemoveAll(dir)

config.go

@@ -33,13 +33,6 @@ type Config struct {
 	DisableUTP bool
 	// For the bittorrent protocol.
 	DisableTCP bool `long:"disable-tcp"`
-	// Defaults to "$HOME/.config/torrent". This is where "blocklist",
-	// "torrents" and other operational files are stored. TODO: Dump this
-	// stuff, this is specific to the default cmd/torrent client only.
-	ConfigDir string
-	// Don't save or load to a cache of torrent files stored in
-	// "$ConfigDir/torrents".
-	DisableMetainfoCache bool
 	// Called to instantiate storage for each added torrent. Provided backends
 	// are in $REPO/data. If not set, the "file" implementation is used.
 	DefaultStorage    storage.I

fs/torrentfs_test.go

@@ -166,9 +166,6 @@ func TestDownloadOnDemand(t *testing.T) {
 		NoDHT:           true,
 		ListenAddr:      "localhost:0",
 		Seed:            true,
-		// Ensure that the metainfo is obtained over the wire, since we added
-		// the torrent to the seeder by magnet.
-		DisableMetainfoCache: true,
 	})
 	require.NoError(t, err)
 	defer seeder.Close()