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[core] perf: faster HTTP pipelined requests 

separate reading header from connection_handle_read_state() into
connection_read_header() so that HTTP pipelined requests can skip
optimistic read()/recv()
This commit is contained in:
Glenn Strauss 2018-11-18 04:36:29 -05:00
parent d1bf435573
commit 473ce93c14
1 changed files with 53 additions and 37 deletions
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90
src/connections.c
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@ -664,47 +664,16 @@ int connection_reset(server *srv, connection *con) {
return 0;
}
/**
* handle all header and content read
*
* we get called by the state-engine and by the fdevent-handler
*/
static int connection_handle_read_state(server *srv, connection *con) {
static void connection_read_header(server *srv, connection *con) {
chunk *c, *last_chunk;
off_t last_offset;
chunkqueue *cq = con->read_queue;
int is_closed = 0; /* the connection got closed, if we don't have a complete header, -> error */
/* when in CON_STATE_READ: about to receive first byte for a request: */
int is_request_start = chunkqueue_is_empty(cq);
if (con->is_readable) {
con->read_idle_ts = srv->cur_ts;
switch(con->network_read(srv, con, con->read_queue, MAX_READ_LIMIT)) {
case -1:
connection_set_state(srv, con, CON_STATE_ERROR);
return -1;
case -2:
is_closed = 1;
break;
default:
break;
}
}
chunkqueue_remove_finished_chunks(cq);
/* we might have got several packets at once
*/
/* update request_start timestamp when first byte of
* next request is received on a keep-alive connection */
if (con->request_count > 1 && is_request_start) {
con->request_start = srv->cur_ts;
if (con->conf.high_precision_timestamps)
log_clock_gettime_realtime(&con->request_start_hp);
}
/* if there is a \r\n\r\n in the chunkqueue
*
* scan the chunk-queue twice
@ -797,10 +766,6 @@ found_header_end:
}
connection_set_state(srv, con, CON_STATE_REQUEST_END);
} else if (is_closed) {
/* the connection got closed and we didn't got enough data to leave CON_STATE_READ;
* the only way is to leave here */
connection_set_state(srv, con, CON_STATE_ERROR);
}
if ((last_chunk ? buffer_string_length(con->request.request) : (size_t)chunkqueue_length(cq))
@ -812,6 +777,57 @@ found_header_end:
}
chunkqueue_remove_finished_chunks(cq);
}
/**
* handle request header read
*
* we get called by the state-engine and by the fdevent-handler
*/
static int connection_handle_read_state(server *srv, connection *con) {
int is_closed = 0; /* the connection got closed, if we don't have a complete header, -> error */
if (con->request_count > 1 && 0 == con->bytes_read) {
/* update request_start timestamp when first byte of
* next request is received on a keep-alive connection */
con->request_start = srv->cur_ts;
if (con->conf.high_precision_timestamps)
log_clock_gettime_realtime(&con->request_start_hp);
if (!chunkqueue_is_empty(con->read_queue)) {
/*(if partially read next request and unable to read() any bytes below,
* then will unnecessarily scan again here before subsequent read())*/
connection_read_header(srv, con);
if (con->state != CON_STATE_READ) {
con->read_idle_ts = srv->cur_ts;
return 0;
}
}
}
if (con->is_readable) {
con->read_idle_ts = srv->cur_ts;
switch (con->network_read(srv, con, con->read_queue, MAX_READ_LIMIT)) {
case -1:
connection_set_state(srv, con, CON_STATE_ERROR);
return -1;
case -2:
is_closed = 1;
break;
default:
break;
}
}
connection_read_header(srv, con);
if (con->state == CON_STATE_READ && is_closed) {
/* the connection got closed and we didn't got enough data to leave CON_STATE_READ;
* the only way is to leave here */
connection_set_state(srv, con, CON_STATE_ERROR);
}
return 0;
}
@ -955,7 +971,7 @@ connection *connection_accept(server *srv, server_socket *srv_socket) {
/* 0: everything ok, -1: error, -2: con closed */
static int connection_read_cq(server *srv, connection *con, chunkqueue *cq, off_t max_bytes) {
int len;
ssize_t len;
char *mem = NULL;
size_t mem_len = 0;
force_assert(cq == con->read_queue); /*(code transform assumption; minimize diff)*/