From e2ffcd008bfda4fde39c6119ab0f446f5d6dc50e Mon Sep 17 00:00:00 2001
From: Matt Joiner <anacrolix@gmail.com>
Date: Tue, 22 Mar 2016 09:06:48 +1100
Subject: [PATCH] Add t.bytesLeftAnnounce

Now it's safe to remove tracker specific bytesLeft contract
---
 client.go  |  4 ++--
 torrent.go | 10 ++++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/client.go b/client.go
index 6d8d7fbb..5e4b5d84 100644
--- a/client.go
+++ b/client.go
@@ -2219,7 +2219,7 @@ func (cl *Client) announceTorrentTrackers(t *torrent) {
 		return
 	}
 	cl.mu.RLock()
-	req.Left = uint64(t.bytesLeft())
+	req.Left = t.bytesLeftAnnounce()
 	trackers := t.Trackers
 	cl.mu.RUnlock()
 	if cl.announceTorrentTrackersFastStart(&req, trackers, t) {
@@ -2228,7 +2228,7 @@ func (cl *Client) announceTorrentTrackers(t *torrent) {
 newAnnounce:
 	for cl.waitWantPeers(t) {
 		cl.mu.RLock()
-		req.Left = uint64(t.bytesLeft())
+		req.Left = t.bytesLeftAnnounce()
 		trackers = t.Trackers
 		cl.mu.RUnlock()
 		numTrackersTried := 0
diff --git a/torrent.go b/torrent.go
index 00d5ac07..6453c508 100644
--- a/torrent.go
+++ b/torrent.go
@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"log"
+	"math"
 	"math/rand"
 	"net"
 	"sort"
@@ -519,6 +520,15 @@ func (t *torrent) bytesLeft() (left int64) {
 	return
 }
 
+// Bytes left to give in tracker announces.
+func (t *torrent) bytesLeftAnnounce() uint64 {
+	if t.haveInfo() {
+		return uint64(t.bytesLeft())
+	} else {
+		return math.MaxUint64
+	}
+}
+
 func (t *torrent) piecePartiallyDownloaded(piece int) bool {
 	if t.pieceComplete(piece) {
 		return false
-- 
2.48.1