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MINOR: listeners: introduce listener_set_state()

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This function is used as a wrapper to set a listener's state everywhere.
We'll use it later to maintain some counters in a consistent state when
switching state so it's capital that all state changes go through it.
No functional change was made beyond calling the wrapper.
This commit is contained in:
Willy Tarreau 2020-09-24 07:23:45 +02:00
parent bec7ab0ad9
commit a37b244509
6 changed files with 31 additions and 22 deletions
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3
include/haproxy/listener.h
View File

@ -30,6 +30,9 @@
#include <haproxy/list.h>
#include <haproxy/listener-t.h>
/* adjust the listener's state and its proxy's listener counters if needed */
void listener_set_state(struct listener *l, enum li_state st);
/* This function tries to temporarily disable a listener, depending on the OS
* capabilities. Linux unbinds the listen socket after a SHUT_RD, and ignores
* SHUT_WR. Solaris refuses either shutdown(). OpenBSD ignores SHUT_RD but

30
src/listener.c
View File

@ -218,6 +218,12 @@ REGISTER_CONFIG_POSTPARSER("multi-threaded accept queue", accept_queue_init);
#endif // USE_THREAD
/* adjust the listener's state */
void listener_set_state(struct listener *l, enum li_state st)
{
l->state = st;
}
/* This function adds the specified listener's file descriptor to the polling
* lists if it is in the LI_LISTEN state. The listener enters LI_READY or
* LI_FULL state depending on its number of connections. In daemon mode, we
@ -237,15 +243,15 @@ static void enable_listener(struct listener *listener)
do_unbind_listener(listener, 1);
else {
do_unbind_listener(listener, 0);
listener->state = LI_LISTEN;
listener_set_state(listener, LI_LISTEN);
}
}
else if (!listener->maxconn || listener->nbconn < listener->maxconn) {
fd_want_recv(listener->rx.fd);
listener->state = LI_READY;
listener_set_state(listener, LI_READY);
}
else {
listener->state = LI_FULL;
listener_set_state(listener, LI_FULL);
}
}
/* if this listener is supposed to be only in the master, close it in the workers */
@ -269,7 +275,7 @@ static void disable_listener(struct listener *listener)
if (listener->state == LI_READY)
fd_stop_recv(listener->rx.fd);
MT_LIST_DEL(&listener->wait_queue);
listener->state = LI_LISTEN;
listener_set_state(listener, LI_LISTEN);
end:
HA_SPIN_UNLOCK(LISTENER_LOCK, &listener->lock);
}
@ -308,7 +314,7 @@ int pause_listener(struct listener *l)
MT_LIST_DEL(&l->wait_queue);
fd_stop_recv(l->rx.fd);
l->state = LI_PAUSED;
listener_set_state(l, LI_PAUSED);
end:
HA_SPIN_UNLOCK(LISTENER_LOCK, &l->lock);
return ret;
@ -372,12 +378,12 @@ int resume_listener(struct listener *l)
goto end;
if (l->maxconn && l->nbconn >= l->maxconn) {
l->state = LI_FULL;
listener_set_state(l, LI_FULL);
goto end;
}
fd_want_recv(l->rx.fd);
l->state = LI_READY;
listener_set_state(l, LI_READY);
end:
HA_SPIN_UNLOCK(LISTENER_LOCK, &l->lock);
return ret;
@ -393,7 +399,7 @@ static void listener_full(struct listener *l)
MT_LIST_DEL(&l->wait_queue);
if (l->state != LI_FULL) {
fd_stop_recv(l->rx.fd);
l->state = LI_FULL;
listener_set_state(l, LI_FULL);
}
}
HA_SPIN_UNLOCK(LISTENER_LOCK, &l->lock);
@ -408,7 +414,7 @@ static void limit_listener(struct listener *l, struct mt_list *list)
if (l->state == LI_READY) {
MT_LIST_TRY_ADDQ(list, &l->wait_queue);
fd_stop_recv(l->rx.fd);
l->state = LI_LIMITED;
listener_set_state(l, LI_LIMITED);
}
HA_SPIN_UNLOCK(LISTENER_LOCK, &l->lock);
}
@ -486,7 +492,7 @@ void do_unbind_listener(struct listener *listener, int do_close)
MT_LIST_DEL(&listener->wait_queue);
if (listener->state >= LI_PAUSED) {
listener->state = LI_ASSIGNED;
listener_set_state(listener, LI_ASSIGNED);
fd_stop_both(listener->rx.fd);
}
@ -547,7 +553,7 @@ int create_listeners(struct bind_conf *bc, const struct sockaddr_storage *ss,
l->rx.fd = fd;
memcpy(&l->rx.addr, ss, sizeof(*ss));
MT_LIST_INIT(&l->wait_queue);
l->state = LI_INIT;
listener_set_state(l, LI_INIT);
proto->add(l, port);
@ -575,7 +581,7 @@ void delete_listener(struct listener *listener)
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
HA_SPIN_LOCK(LISTENER_LOCK, &listener->lock);
if (listener->state == LI_ASSIGNED) {
listener->state = LI_INIT;
listener_set_state(listener, LI_INIT);
LIST_DEL(&listener->rx.proto_list);
listener->rx.proto->nb_listeners--;
_HA_ATOMIC_SUB(&jobs, 1);

4
src/proto_sockpair.c
View File

@ -89,7 +89,7 @@ static void sockpair_add_listener(struct listener *listener, int port)
{
if (listener->state != LI_INIT)
return;
listener->state = LI_ASSIGNED;
listener_set_state(listener, LI_ASSIGNED);
listener->rx.proto = &proto_sockpair;
LIST_ADDQ(&proto_sockpair.listeners, &listener->rx.proto_list);
proto_sockpair.nb_listeners++;
@ -175,7 +175,7 @@ static int sockpair_bind_listener(struct listener *listener, char *errmsg, int e
goto err_return;
}
listener->state = LI_LISTEN;
listener_set_state(listener, LI_LISTEN);
return err;
err_return:

6
src/proto_tcp.c
View File

@ -676,7 +676,7 @@ int tcp_bind_listener(struct listener *listener, char *errmsg, int errlen)
#endif
/* the socket is ready */
listener->state = LI_LISTEN;
listener_set_state(listener, LI_LISTEN);
goto tcp_return;
tcp_close_return:
@ -702,7 +702,7 @@ static void tcpv4_add_listener(struct listener *listener, int port)
{
if (listener->state != LI_INIT)
return;
listener->state = LI_ASSIGNED;
listener_set_state(listener, LI_ASSIGNED);
listener->rx.proto = &proto_tcpv4;
((struct sockaddr_in *)(&listener->rx.addr))->sin_port = htons(port);
LIST_ADDQ(&proto_tcpv4.listeners, &listener->rx.proto_list);
@ -720,7 +720,7 @@ static void tcpv6_add_listener(struct listener *listener, int port)
{
if (listener->state != LI_INIT)
return;
listener->state = LI_ASSIGNED;
listener_set_state(listener, LI_ASSIGNED);
listener->rx.proto = &proto_tcpv6;
((struct sockaddr_in *)(&listener->rx.addr))->sin_port = htons(port);
LIST_ADDQ(&proto_tcpv6.listeners, &listener->rx.proto_list);

6
src/proto_udp.c
View File

@ -114,7 +114,7 @@ int udp_bind_listener(struct listener *listener, char *errmsg, int errlen)
goto udp_return;
}
listener->state = LI_LISTEN;
listener_set_state(listener, LI_LISTEN);
udp_return:
if (msg && errlen) {
@ -134,7 +134,7 @@ static void udp4_add_listener(struct listener *listener, int port)
{
if (listener->state != LI_INIT)
return;
listener->state = LI_ASSIGNED;
listener_set_state(listener, LI_ASSIGNED);
listener->rx.proto = &proto_udp4;
((struct sockaddr_in *)(&listener->rx.addr))->sin_port = htons(port);
LIST_ADDQ(&proto_udp4.listeners, &listener->rx.proto_list);
@ -149,7 +149,7 @@ static void udp6_add_listener(struct listener *listener, int port)
{
if (listener->state != LI_INIT)
return;
listener->state = LI_ASSIGNED;
listener_set_state(listener, LI_ASSIGNED);
listener->rx.proto = &proto_udp6;
((struct sockaddr_in *)(&listener->rx.addr))->sin_port = htons(port);
LIST_ADDQ(&proto_udp6.listeners, &listener->rx.proto_list);

4
src/proto_uxst.c
View File

@ -118,7 +118,7 @@ static int uxst_bind_listener(struct listener *listener, char *errmsg, int errle
}
/* the socket is now listening */
listener->state = LI_LISTEN;
listener_set_state(listener, LI_LISTEN);
return err;
uxst_close_return:
@ -142,7 +142,7 @@ static void uxst_add_listener(struct listener *listener, int port)
{
if (listener->state != LI_INIT)
return;
listener->state = LI_ASSIGNED;
listener_set_state(listener, LI_ASSIGNED);
listener->rx.proto = &proto_unix;
LIST_ADDQ(&proto_unix.listeners, &listener->rx.proto_list);
proto_unix.nb_listeners++;