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ls-refs: reuse buffer when sending refs 

In the initial reference advertisement, the Git server will first
announce all of its references to the client. The logic is handled in
`send_ref()`, which will allocate a new buffer for each refline it is
about to send. This is quite wasteful: instead of allocating a new
buffer each time, we can just reuse a buffer.

Improve this by passing in a buffer via the `ls_refs_data` struct which
is then reused on each reference.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt 2021-08-25 15:49:51 +02:00 committed by Junio C Hamano
parent 225bc32a98
commit f54b9f21ca
1 changed files with 11 additions and 8 deletions
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19
ls-refs.c
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@ -65,6 +65,7 @@ struct ls_refs_data {
unsigned peel;
unsigned symrefs;
struct strvec prefixes;
struct strbuf buf;
unsigned unborn : 1;
};
@ -73,7 +74,8 @@ static int send_ref(const char *refname, const struct object_id *oid,
{
struct ls_refs_data *data = cb_data;
const char *refname_nons = strip_namespace(refname);
struct strbuf refline = STRBUF_INIT;
strbuf_reset(&data->buf);
if (ref_is_hidden(refname_nons, refname))
return 0;
@ -82,9 +84,9 @@ static int send_ref(const char *refname, const struct object_id *oid,
return 0;
if (oid)
strbuf_addf(&refline, "%s %s", oid_to_hex(oid), refname_nons);
strbuf_addf(&data->buf, "%s %s", oid_to_hex(oid), refname_nons);
else
strbuf_addf(&refline, "unborn %s", refname_nons);
strbuf_addf(&data->buf, "unborn %s", refname_nons);
if (data->symrefs && flag & REF_ISSYMREF) {
struct object_id unused;
const char *symref_target = resolve_ref_unsafe(refname, 0,
@ -94,20 +96,19 @@ static int send_ref(const char *refname, const struct object_id *oid,
if (!symref_target)
die("'%s' is a symref but it is not?", refname);
strbuf_addf(&refline, " symref-target:%s",
strbuf_addf(&data->buf, " symref-target:%s",
strip_namespace(symref_target));
}
if (data->peel && oid) {
struct object_id peeled;
if (!peel_iterated_oid(oid, &peeled))
strbuf_addf(&refline, " peeled:%s", oid_to_hex(&peeled));
strbuf_addf(&data->buf, " peeled:%s", oid_to_hex(&peeled));
}
strbuf_addch(&refline, '\n');
packet_write(1, refline.buf, refline.len);
strbuf_addch(&data->buf, '\n');
packet_write(1, data->buf.buf, data->buf.len);
strbuf_release(&refline);
return 0;
}
@ -145,6 +146,7 @@ int ls_refs(struct repository *r, struct strvec *keys,
memset(&data, 0, sizeof(data));
strvec_init(&data.prefixes);
strbuf_init(&data.buf, 0);
ensure_config_read();
git_config(ls_refs_config, NULL);
@ -173,6 +175,7 @@ int ls_refs(struct repository *r, struct strvec *keys,
send_ref, &data, 0);
packet_flush(1);
strvec_clear(&data.prefixes);
strbuf_release(&data.buf);
return 0;
}