require channel name, read channel ids from file

README.md

@@ -3,8 +3,7 @@
 - make sure you don't have a `.lbryum/wallets/default_wallet` 
   - delete existing wallet if there's nothing you need there, or better yet, move it somewhere else in case you need it later
 - make sure daemon is stopped and can be controlled with `systemctl`
-- run `lbry ytsync YOUTUBE_KEY YOUTUBE_CHANNEL_ID LBRY_CHANNEL_NAME --max-tries=5`
-  - `max-tries` will retry errors that you will probably get (e.g. failed publishes)
+- run `lbry ytsync YOUTUBE_KEY LBRY_CHANNEL_NAME YOUTUBE_CHANNEL_ID`
 - after sync is complete, daemon will be stopped and wallet will be moved to `~/wallets/`
 - now mark content as synced in doc
 

setup.go

@@ -28,12 +28,9 @@ func (s *Sync) walletSetup() error {
 	}
 	log.Debugf("Source channel has %d videos", numOnSource)
 
-	numPublished := uint64(0)
-	if s.LbryChannelName != "" {
-		numPublished, err = s.daemon.NumClaimsInChannel(s.LbryChannelName)
-		if err != nil {
-			return err
-		}
+	numPublished, err := s.daemon.NumClaimsInChannel(s.LbryChannelName)
+	if err != nil {
+		return err
 	}
 	log.Debugf("We already published %d videos", numPublished)
 
@@ -88,11 +85,9 @@ func (s *Sync) walletSetup() error {
 		return err
 	}
 
-	if s.LbryChannelName != "" {
-		err = s.ensureChannelOwnership()
-		if err != nil {
-			return err
-		}
+	err = s.ensureChannelOwnership()
+	if err != nil {
+		return err
 	}
 
 	balanceResp, err = s.daemon.WalletBalance()

ytsync.go

@@ -1,6 +1,7 @@
 package ytsync
 
 import (
+	"encoding/json"
 	"io/ioutil"
 	"net/http"
 	"os"
@@ -69,6 +70,14 @@ func (s *Sync) FullCycle() error {
 		return errors.New("no $HOME env var found")
 	}
 
+	if s.YoutubeChannelID == "" {
+		channelID, err := getChannelIDFromFile(s.LbryChannelName)
+		if err != nil {
+			return err
+		}
+		s.YoutubeChannelID = channelID
+	}
+
 	defaultWalletDir := os.Getenv("HOME") + "/.lbryum/wallets/default_wallet"
 	walletBackupDir := os.Getenv("HOME") + "/wallets/" + strings.Replace(s.LbryChannelName, "@", "", 1)
 
@@ -341,3 +350,23 @@ func stopDaemonViaSystemd() error {
 	}
 	return nil
 }
+
+func getChannelIDFromFile(channelName string) (string, error) {
+	channelsJSON, err := ioutil.ReadFile("./channels")
+	if err != nil {
+		return "", errors.Wrap(err, 0)
+	}
+
+	var channels map[string]string
+	err = json.Unmarshal(channelsJSON, &channels)
+	if err != nil {
+		return "", errors.Wrap(err, 0)
+	}
+
+	channelID, ok := channels[channelName]
+	if !ok {
+		return "", errors.New("channel not in list")
+	}
+
+	return channelID, nil
+}