From 3e63b21aced116badd30a279c479535449a63560 Mon Sep 17 00:00:00 2001 From: "Shawn O. Pearce" Date: Mon, 14 Mar 2011 17:59:40 -0700 Subject: [PATCH] upload-pack: Implement no-done capability If the client requests both multi_ack_detailed and no-done then upload-pack is free to immediately send a PACK following its first 'ACK %s ready' message. The upload-pack response actually winds up being: ACK %s common ... (maybe more) ... ACK %s ready NAK ACK %s PACK.... the pack stream .... For smart HTTP connections this saves one HTTP RPC, reducing the overall latency for a trivial fetch. For git:// and ssh:// a no-done option slightly reduces latency by removing one server->client->server round-trip at the end of the common ancestor negotiation. Signed-off-by: Shawn O. Pearce Signed-off-by: Junio C Hamano --- upload-pack.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff --git a/upload-pack.c b/upload-pack.c index 11c3849a7..5924f6f98 100644 --- a/upload-pack.c +++ b/upload-pack.c @@ -27,6 +27,7 @@ static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=< static unsigned long oldest_have; static int multi_ack, nr_our_refs; +static int no_done; static int use_thin_pack, use_ofs_delta, use_include_tag; static int no_progress, daemon_mode; static int shallow_nr; @@ -431,6 +432,7 @@ static int get_common_commits(void) char last_hex[41]; int got_common = 0; int got_other = 0; + int sent_ready = 0; save_commit_buffer = 0; @@ -440,10 +442,17 @@ static int get_common_commits(void) if (!len) { if (multi_ack == 2 && got_common - && !got_other && ok_to_give_up()) + && !got_other && ok_to_give_up()) { + sent_ready = 1; packet_write(1, "ACK %s ready\n", last_hex); + } if (have_obj.nr == 0 || multi_ack) packet_write(1, "NAK\n"); + + if (no_done && sent_ready) { + packet_write(1, "ACK %s\n", last_hex); + return 0; + } if (stateless_rpc) exit(0); got_common = 0; @@ -457,9 +466,10 @@ static int get_common_commits(void) got_other = 1; if (multi_ack && ok_to_give_up()) { const char *hex = sha1_to_hex(sha1); - if (multi_ack == 2) + if (multi_ack == 2) { + sent_ready = 1; packet_write(1, "ACK %s ready\n", hex); - else + } else packet_write(1, "ACK %s continue\n", hex); } break; @@ -535,6 +545,8 @@ static void receive_needs(void) multi_ack = 2; else if (strstr(line+45, "multi_ack")) multi_ack = 1; + if (strstr(line+45, "no-done")) + no_done = 1; if (strstr(line+45, "thin-pack")) use_thin_pack = 1; if (strstr(line+45, "ofs-delta")) @@ -628,7 +640,7 @@ static int send_ref(const char *refname, const unsigned char *sha1, int flag, vo { static const char *capabilities = "multi_ack thin-pack side-band" " side-band-64k ofs-delta shallow no-progress" - " include-tag multi_ack_detailed"; + " include-tag multi_ack_detailed no-done"; struct object *o = parse_object(sha1); if (!o) -- 2.30.2