Import the connector from uirc3
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792b074e3d
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244
liberty.c
244
liberty.c
@ -192,6 +192,12 @@ static bool g_soft_asserts_are_deadly; ///< soft_assert() aborts as well
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log_message (print_debug_data, "debug: ", __VA_ARGS__); \
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BLOCK_END
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// A few other debugging shorthands for when failures are allowed
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#define LOG_FUNC_FAILURE(name, desc) \
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print_debug ("%s: %s: %s", __func__, (name), (desc))
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#define LOG_LIBC_FAILURE(name) \
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print_debug ("%s: %s: %s", __func__, (name), strerror (errno))
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static void
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assertion_failure_handler (bool is_fatal, const char *file, int line,
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const char *function, const char *condition)
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@ -3383,6 +3389,244 @@ test_run (struct test *self)
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return 0;
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}
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// --- Connector ---------------------------------------------------------------
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#ifdef LIBERTY_WANT_POLLER
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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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struct connector_target
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{
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LIST_HEADER (struct connector_target)
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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 addrinfo *results; ///< Resolved target
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struct addrinfo *iter; ///< Current endpoint
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};
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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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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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free (self->hostname);
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free (self->service);
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freeaddrinfo (self->results);
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free (self);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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struct connector
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{
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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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struct connector_target *targets_t; ///< Tail of targets
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void *user_data; ///< User data for callbacks
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// You may destroy the connector object in these two main callbacks:
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/// Connection has been successfully established
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void (*on_connected) (void *user_data, int socket);
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/// Failed to establish a connection to either target
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void (*on_failure) (void *user_data);
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// Optional:
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/// Connecting to a new address
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void (*on_connecting) (void *user_data, const char *address);
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/// Connecting to the last address has failed
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void (*on_error) (void *user_data, const char *error);
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};
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static void
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connector_notify_connecting (struct connector *self,
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struct connector_target *target, struct addrinfo *gai_iter)
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{
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if (!self->on_connecting)
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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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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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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_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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{
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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
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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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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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connector_notify_connecting (self, target, gai_iter);
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int fd = socket (gai_iter->ai_family,
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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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return;
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}
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set_cloexec (fd);
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set_blocking (fd, false);
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int yes = 1;
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soft_assert (setsockopt (fd, SOL_SOCKET, SO_KEEPALIVE,
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&yes, sizeof yes) != -1);
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if (!connect (fd, gai_iter->ai_addr, gai_iter->ai_addrlen))
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{
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set_blocking (fd, true);
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self->on_connected (self->user_data, fd);
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return;
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}
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if (errno != EINPROGRESS)
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{
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connector_notify_error (self, strerror (errno));
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xclose (fd);
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connector_prepare_next (self);
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connector_step (self);
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return;
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}
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self->connected_event.fd = self->socket = fd;
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poller_fd_set (&self->connected_event, POLLOUT);
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connector_prepare_next (self);
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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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{
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// See http://cr.yp.to/docs/connect.html if this doesn't work.
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// The second connect() method doesn't work with DragonflyBSD.
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int error = 0;
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socklen_t error_len = sizeof error;
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hard_assert (!getsockopt (pfd->fd,
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SOL_SOCKET, SO_ERROR, &error, &error_len));
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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_step (self);
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}
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else
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{
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poller_fd_reset (&self->connected_event);
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self->socket = -1;
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set_blocking (pfd->fd, true);
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self->on_connected (self->user_data, pfd->fd);
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}
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}
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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->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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self->connected_event.dispatcher = (poller_fd_fn) connector_on_ready;
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}
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static void
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connector_free (struct connector *self)
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{
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poller_fd_reset (&self->connected_event);
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if (self->socket != -1)
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xclose (self->socket);
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LIST_FOR_EACH (struct connector_target, iter, self->targets)
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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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{
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struct addrinfo hints, *results;
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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 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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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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// --- Protocol modules --------------------------------------------------------
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#include "liberty-proto.c"
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