commit 4812b9a8b6c0b1798b7980d0a7f04d25dae4b396
Author: David Fifield <da...@bamsoftware.com>
Date: Thu Dec 25 21:33:41 2014 -0800
Reduce meek-client sessionIdLength to 8 from 32, and strip trailing '='.
This reduces the encoded length of a session ID from 44 bytes down to
12. If we have 1000 simultaneous users, and they're all idle and polling
at 5 requests/s, then this change saves 1000*(44-12)/5 = 6.4 KB/s.
According to https://trac.torproject.org/projects/tor/ticket/12778, the
header length is about 413 bytes, so the shorter session ID saves about
7% in the header.
---
meek-client/meek-client.go | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/meek-client/meek-client.go b/meek-client/meek-client.go
index 862f154..c02c784 100644
--- a/meek-client/meek-client.go
+++ b/meek-client/meek-client.go
@@ -42,6 +42,7 @@ import (
"net/url"
"os"
"os/signal"
+ "strings"
"syscall"
"time"
)
@@ -54,7 +55,7 @@ const (
// long-lived session. We split a TCP stream across multiple HTTP
// requests, and those with the same session ID belong to the same
// stream.
- sessionIdLength = 32
+ sessionIdLength = 8
// The size of the largest chunk of data we will read from the SOCKS
// port before forwarding it in a request, and the maximum size of a
// body we are willing to handle in a reply.
@@ -249,7 +250,7 @@ func genSessionId() string {
if err != nil {
panic(err.Error())
}
- return base64.StdEncoding.EncodeToString(buf)
+ return strings.TrimRight(base64.StdEncoding.EncodeToString(buf), "=")
}
// Callback for new SOCKS requests.
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