Rewrite connector to use asynchronous getaddrinfo
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733de7bae2
commit
66340e08d7
131
liberty.c
131
liberty.c
@ -3916,7 +3916,7 @@ test_run (struct test *self)
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// --- Connector ---------------------------------------------------------------
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#ifdef LIBERTY_WANT_POLLER
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#if defined LIBERTY_WANT_POLLER && defined LIBERTY_WANT_ASYNC
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// This is a helper that tries to establish a connection with any address on
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// a given list. Sadly it also introduces a bit of a callback hell.
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@ -3924,10 +3924,14 @@ test_run (struct test *self)
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struct connector_target
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{
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LIST_HEADER (struct connector_target)
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struct connector *connector; ///< Parent connector
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char *hostname; ///< Target hostname or address
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char *service; ///< Target service name or port
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struct async *getaddrinfo_event; ///< Address resolution
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struct error *getaddrinfo_error; ///< Address resolution error
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struct addrinfo *results; ///< Resolved target
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struct addrinfo *iter; ///< Current endpoint
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};
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@ -3935,13 +3939,18 @@ struct connector_target
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static struct connector_target *
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connector_target_new (void)
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{
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struct connector_target *self = xmalloc (sizeof *self);
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struct connector_target *self = xcalloc (1, sizeof *self);
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return self;
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}
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static void
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connector_target_destroy (struct connector_target *self)
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{
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if (self->getaddrinfo_event)
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async_cancel (self->getaddrinfo_event);
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if (self->getaddrinfo_error)
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error_free (self->getaddrinfo_error);
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free (self->hostname);
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free (self->service);
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freeaddrinfo (self->results);
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@ -3952,6 +3961,7 @@ connector_target_destroy (struct connector_target *self)
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struct connector
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{
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struct poller *poller; ///< Poller
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int socket; ///< Socket FD for the connection
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struct poller_fd connected_event; ///< We've connected or failed
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struct connector_target *targets; ///< Targets
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@ -3983,28 +3993,24 @@ connector_notify_connecting (struct connector *self,
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return;
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const char *real_host = target->hostname;
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// We don't really need this, so we can let it quietly fail
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char buf[NI_MAXHOST];
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if (gai_iter)
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{
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// We don't really need this, so we can let it quietly fail
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int err = getnameinfo (gai_iter->ai_addr, gai_iter->ai_addrlen,
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buf, sizeof buf, NULL, 0, NI_NUMERICHOST);
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if (err)
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LOG_FUNC_FAILURE ("getnameinfo", gai_strerror (err));
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else
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real_host = buf;
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}
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char *address = format_host_port_pair (real_host, target->service);
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self->on_connecting (self->user_data, address);
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free (address);
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}
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static void
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connector_notify_error (struct connector *self, const char *error)
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{
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if (self->on_error)
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self->on_error (self->user_data, error);
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}
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static void
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connector_notify_connected (struct connector *self, int fd)
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{
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@ -4016,23 +4022,38 @@ static void
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connector_prepare_next (struct connector *self)
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{
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struct connector_target *target = self->targets;
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if (!(target->iter = target->iter->ai_next))
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if (!target->iter || !(target->iter = target->iter->ai_next))
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{
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LIST_UNLINK_WITH_TAIL (self->targets, self->targets_t, target);
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connector_target_destroy (target);
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}
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}
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static void connector_handle_error (struct connector *self, const char *error);
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/// See if there's any target remaining at all -- it can however either still
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/// be waiting for address resolution to finish, or have already failed
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static bool
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connector_check_target (struct connector *self, struct connector_target *target)
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{
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if (!target)
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self->on_failure (self->user_data);
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else if (target->getaddrinfo_error)
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{
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connector_notify_connecting (self, target, NULL);
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connector_handle_error (self, target->getaddrinfo_error->message);
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}
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else if (target->results)
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return true;
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return false;
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}
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static void
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connector_step (struct connector *self)
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{
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struct connector_target *target = self->targets;
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if (!target)
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{
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// Total failure, none of the targets has succeeded
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self->on_failure (self->user_data);
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if (!connector_check_target (self, target))
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return;
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}
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struct addrinfo *gai_iter = target->iter;
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hard_assert (gai_iter != NULL);
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@ -4043,10 +4064,7 @@ connector_step (struct connector *self)
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gai_iter->ai_socktype, gai_iter->ai_protocol);
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if (fd == -1)
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{
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connector_notify_error (self, strerror (errno));
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connector_prepare_next (self);
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connector_step (self);
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connector_handle_error (self, strerror (errno));
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return;
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}
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@ -4066,13 +4084,20 @@ connector_step (struct connector *self)
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}
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else
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{
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connector_notify_error (self, strerror (errno));
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connector_handle_error (self, strerror (errno));
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xclose (fd);
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}
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}
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static void
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connector_handle_error (struct connector *self, const char *error)
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{
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if (self->on_error)
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self->on_error (self->user_data, error);
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connector_prepare_next (self);
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connector_step (self);
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}
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}
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static void
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connector_on_ready (const struct pollfd *pfd, struct connector *self)
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@ -4087,14 +4112,11 @@ connector_on_ready (const struct pollfd *pfd, struct connector *self)
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if (error)
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{
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connector_notify_error (self, strerror (error));
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poller_fd_reset (&self->connected_event);
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xclose (self->socket);
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self->socket = -1;
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connector_prepare_next (self);
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connector_step (self);
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connector_handle_error (self, strerror (error));
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}
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else
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{
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@ -4108,6 +4130,7 @@ static void
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connector_init (struct connector *self, struct poller *poller)
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{
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memset (self, 0, sizeof *self);
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self->poller = poller;
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self->socket = -1;
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poller_fd_init (&self->connected_event, poller, self->socket);
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self->connected_event.user_data = self;
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@ -4125,34 +4148,50 @@ connector_free (struct connector *self)
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connector_target_destroy (iter);
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}
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static bool
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connector_add_target (struct connector *self,
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const char *hostname, const char *service, struct error **e)
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static void
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connector_on_getaddrinfo (int err, struct addrinfo *results, void *user_data)
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{
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struct addrinfo hints, *results;
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struct connector_target *self = user_data;
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if (err)
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{
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error_set (&self->getaddrinfo_error,
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"%s: %s", "getaddrinfo", gai_strerror (err));
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}
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self->results = self->iter = results;
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self->getaddrinfo_event = NULL;
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// We've been waiting for this address to be resolved
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if (self == self->connector->targets)
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connector_step (self->connector);
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}
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/// Connection will be attempted asynchronously once you add any target
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static void
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connector_add_target (struct connector *self,
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const char *hostname, const char *service)
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{
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struct connector_target *target = connector_target_new ();
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target->connector = self;
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target->hostname = xstrdup (hostname);
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target->service = xstrdup (service);
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struct addrinfo hints;
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memset (&hints, 0, sizeof hints);
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hints.ai_socktype = SOCK_STREAM;
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// TODO: even this should be done asynchronously, most likely in
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// a thread pool, similarly to how libuv does it
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int err = getaddrinfo (hostname, service, &hints, &results);
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if (err)
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{
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error_set (e, "%s: %s", "getaddrinfo", gai_strerror (err));
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return false;
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}
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struct async_getaddrinfo *gai = async_getaddrinfo
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(&self->poller->common.async, hostname, service, &hints);
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struct connector_target *target = connector_target_new ();
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target->hostname = xstrdup (hostname);
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target->service = xstrdup (service);
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target->results = results;
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target->iter = target->results;
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gai->dispatcher = connector_on_getaddrinfo;
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gai->user_data = target;
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target->getaddrinfo_event = &gai->async;
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LIST_APPEND_WITH_TAIL (self->targets, self->targets_t, target);
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return true;
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}
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#endif // LIBERTY_WANT_POLLER
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#endif // defined LIBERTY_WANT_POLLER && defined LIBERTY_WANT_ASYNC
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// --- Advanced configuration --------------------------------------------------
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