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libfetch: fixups to packetization socket option setting 

- split the code to a helper function
- do not set sockets to corked state when putting back to
  cache so socket state is always deterministic
- cork/uncork also when sending CONNECT to a proxy, this
  can reduce a little bit the latency how fast the packet
  gets sent out
- also pair corking with uncorking in http_request to make
  it more obvious pairing
cute-signatures
Timo Teräs 2020-03-25 08:50:44 +02:00
parent 09dbe46a76
commit eae92bbacf
1 changed files with 22 additions and 26 deletions
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48
libfetch/http.c
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@ -107,8 +107,6 @@
#define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599)
static int val_yes = 1, val_no = 0;
static int http_cmd(conn_t *, const char *, ...) LIBFETCH_PRINTFLIKE(2, 3);
/*****************************************************************************
@ -299,14 +297,6 @@ http_closefn(void *v)
conn_t *conn = io->conn;
if (io->keep_alive) {
#if defined(TCP_CORK)
setsockopt(conn->sd, IPPROTO_TCP, TCP_CORK, &val_yes, sizeof val_yes);
#else
setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val_no, sizeof val_no);
#if defined(TCP_NOPUSH) && !defined(__APPLE__)
setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val_yes, sizeof val_yes);
#endif
#endif
fetch_cache_put(conn, fetch_close);
} else {
fetch_close(conn);
@ -673,11 +663,27 @@ http_authorize(conn_t *conn, const char *hdr, const char *p)
return (-1);
}
/*****************************************************************************
* Helper functions for connecting to a server or proxy
*/
/*
* Helper for setting socket options regarding packetization
*/
static void
http_cork(conn_t *conn, int val)
{
#if defined(TCP_CORK)
setsockopt(conn->sd, IPPROTO_TCP, TCP_CORK, &val, sizeof val);
#else
#if defined(TCP_NOPUSH) && !defined(__APPLE__)
setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof val);
#endif
val = !val;
setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof val);
#endif
}
/*
* Connect to the correct HTTP server or proxy.
*/
@ -711,8 +717,10 @@ http_connect(struct url *URL, struct url *purl, const char *flags, int *cached)
/* fetch_connect() has already set an error code */
return (NULL);
if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && purl) {
http_cork(conn, 1);
http_cmd(conn, "CONNECT %s:%d HTTP/1.1\r\nHost: %s:%d\r\n\r\n",
URL->host, URL->port, URL->host, URL->port);
http_cork(conn, 0);
if (http_get_reply(conn) != HTTP_OK) {
http_seterr(conn->err);
goto ouch;
@ -746,13 +754,6 @@ http_connect(struct url *URL, struct url *purl, const char *flags, int *cached)
fetch_syserr();
goto ouch;
}
#if defined(TCP_CORK)
setsockopt(conn->sd, IPPROTO_TCP, TCP_CORK, &val_yes, sizeof val_yes);
#elif defined(TCP_NOPUSH) && !defined(__APPLE__)
setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val_yes, sizeof val_yes);
#endif
return (conn);
ouch:
fetch_close(conn);
@ -906,6 +907,8 @@ http_request(struct url *URL, const char *op, struct url_stat *us,
if (verbose)
fetch_info("requesting %s://%s%s",
url->scheme, host, url->doc);
http_cork(conn, 1);
if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) {
http_cmd(conn, "%s %s://%s%s HTTP/1.1\r\n",
op, url->scheme, host, url->doc);
@ -968,14 +971,7 @@ http_request(struct url *URL, const char *op, struct url_stat *us,
* be compatible with such configurations, fiddle with socket
* options to force the pending data to be written.
*/
#if defined(TCP_CORK)
setsockopt(conn->sd, IPPROTO_TCP, TCP_CORK, &val_no, sizeof val_no);
#else
#if defined(TCP_NOPUSH) && !defined(__APPLE__)
setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val_no, sizeof val_no);
#endif
setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val_yes, sizeof val_yes);
#endif
http_cork(conn, 0);
/* get reply */
switch (http_get_reply(conn)) {