Factor out an abstraction for cURL multi interface
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parent
43da7cd3c9
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7944a91707
GPG Key ID:
B715679E3A361BE6
463
nncmpp.c
463
nncmpp.c
@ -142,6 +142,223 @@ clock_msec (clockid_t clock)
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return (int64_t) tp.tv_sec * 1000 + (int64_t) tp.tv_nsec / 1000000;
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}
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// --- cURL async wrapper ------------------------------------------------------
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// You are meant to subclass this structure, no user_data pointers needed
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struct poller_curl_task;
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/// Receives notification for finished transfers
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typedef void (*poller_curl_done_fn)
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(CURLMsg *msg, struct poller_curl_task *task);
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struct poller_curl_task
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{
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CURL *easy; ///< cURL easy interface handle
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char curl_error[CURL_ERROR_SIZE]; ///< cURL error info buffer
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poller_curl_done_fn on_done; ///< Done callback
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};
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struct poller_curl_fd
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{
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LIST_HEADER (struct poller_curl_fd)
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struct poller_fd fd; ///< Poller FD
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};
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struct poller_curl
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{
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struct poller *poller; ///< Parent poller
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struct poller_timer timer; ///< cURL timer
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CURLM *multi; ///< cURL multi interface handle
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struct poller_curl_fd *fds; ///< List of all FDs
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};
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static void
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poller_curl_collect (struct poller_curl *self, curl_socket_t s, int ev_bitmask)
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{
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int running = 0;
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CURLMcode res;
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// XXX: ignoring errors, in particular CURLM_CALL_MULTI_PERFORM
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if ((res = curl_multi_socket_action (self->multi, s, ev_bitmask, &running)))
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print_debug ("cURL: %s", curl_multi_strerror (res));
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CURLMsg *msg;
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while ((msg = curl_multi_info_read (self->multi, &running)))
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if (msg->msg == CURLMSG_DONE)
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{
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struct poller_curl_task *task = NULL;
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hard_assert (!curl_easy_getinfo
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(msg->easy_handle, CURLINFO_PRIVATE, &task));
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task->on_done (msg, task);
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}
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}
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static void
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poller_curl_on_socket (const struct pollfd *pfd, void *user_data)
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{
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int mask = 0;
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if (pfd->revents & POLLIN) mask |= CURL_CSELECT_IN;
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if (pfd->revents & POLLOUT) mask |= CURL_CSELECT_OUT;
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if (pfd->revents & POLLERR) mask |= CURL_CSELECT_ERR;
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poller_curl_collect (user_data, pfd->fd, mask);
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}
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static int
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poller_curl_on_socket_action (CURL *easy, curl_socket_t s, int what,
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void *user_data, void *socket_data)
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{
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(void) easy;
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struct poller_curl *self = user_data;
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struct poller_curl_fd *fd;
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if (!(fd = socket_data))
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{
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fd = xmalloc (sizeof *fd);
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LIST_PREPEND (self->fds, fd);
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poller_fd_init (&fd->fd, self->poller, s);
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fd->fd.dispatcher = poller_curl_on_socket;
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fd->fd.user_data = self;
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curl_multi_assign (self->multi, s, fd);
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}
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if (what == CURL_POLL_REMOVE)
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{
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poller_fd_reset (&fd->fd);
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LIST_UNLINK (self->fds, fd);
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free (fd);
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}
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else
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{
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short events = 0;
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if (what == CURL_POLL_IN) events = POLLIN;
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if (what == CURL_POLL_OUT) events = POLLOUT;
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if (what == CURL_POLL_INOUT) events = POLLIN | POLLOUT;
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poller_fd_set (&fd->fd, events);
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}
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return 0;
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}
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static void
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poller_curl_on_timer (void *user_data)
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{
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poller_curl_collect (user_data, CURL_SOCKET_TIMEOUT, 0);
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}
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static int
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poller_curl_on_timer_change (CURLM *multi, long timeout_ms, void *user_data)
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{
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(void) multi;
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struct poller_curl *self = user_data;
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if (timeout_ms < 0)
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poller_timer_reset (&self->timer);
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else
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poller_timer_set (&self->timer, timeout_ms);
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return 0;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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static bool
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poller_curl_init (struct poller_curl *self, struct poller *poller,
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struct error **e)
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{
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memset (self, 0, sizeof *self);
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if (!(self->multi = curl_multi_init ()))
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{
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error_set (e, "cURL setup failed");
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return false;
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}
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CURLMcode mres;
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if ((mres = curl_multi_setopt (self->multi,
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CURLMOPT_SOCKETFUNCTION, poller_curl_on_socket_action))
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|| (mres = curl_multi_setopt (self->multi,
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CURLMOPT_TIMERFUNCTION, poller_curl_on_timer_change))
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|| (mres = curl_multi_setopt (self->multi, CURLMOPT_SOCKETDATA, self))
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|| (mres = curl_multi_setopt (self->multi, CURLMOPT_TIMERDATA, self)))
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{
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error_set (e, "%s: %s",
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"cURL setup failed", curl_multi_strerror (mres));
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curl_multi_cleanup (self->multi);
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return false;
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}
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poller_timer_init (&self->timer, (self->poller = poller));
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self->timer.dispatcher = poller_curl_on_timer;
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self->timer.user_data = self;
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return true;
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}
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static void
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poller_curl_free (struct poller_curl *self)
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{
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curl_multi_cleanup (self->multi);
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poller_timer_reset (&self->timer);
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LIST_FOR_EACH (struct poller_curl_fd, iter, self->fds)
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{
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poller_fd_reset (&iter->fd);
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free (iter);
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}
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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/// Initialize a task with a new easy instance that can be used with the poller
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static bool
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poller_curl_spawn (struct poller_curl_task *task, struct error **e)
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{
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CURL *easy;
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if (!(easy = curl_easy_init ()))
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{
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error_set (e, "cURL setup failed");
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return false;
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}
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// We already take care of SIGPIPE, and native DNS timeouts are only
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// a problem for people without the AsynchDNS feature.
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//
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// Unfortunately, cURL doesn't allow custom callbacks for DNS.
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// The most we could try is parse out the hostname and provide an address
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// override for it using CURLOPT_RESOLVE. Or be our own SOCKS4A/5 proxy.
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CURLcode res;
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if ((res = curl_easy_setopt (easy, CURLOPT_NOSIGNAL, 1L))
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|| (res = curl_easy_setopt (easy, CURLOPT_ERRORBUFFER, task->curl_error))
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|| (res = curl_easy_setopt (easy, CURLOPT_PRIVATE, task)))
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{
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error_set (e, "%s", curl_easy_strerror (res));
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curl_easy_cleanup (easy);
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return false;
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}
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task->easy = easy;
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return true;
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}
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static bool
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poller_curl_add (struct poller_curl *self, CURL *easy, struct error **e)
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{
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CURLMcode mres;
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// "CURLMOPT_TIMERFUNCTION [...] will be called from within this function"
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if (!(mres = curl_multi_add_handle (self->multi, easy)))
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return true;
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error_set (e, "%s", curl_multi_strerror (mres));
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return false;
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}
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static bool
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poller_curl_remove (struct poller_curl *self, CURL *easy, struct error **e)
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{
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CURLMcode mres;
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if (!(mres = curl_multi_remove_handle (self->multi, easy)))
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return true;
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error_set (e, "%s", curl_multi_strerror (mres));
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return false;
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}
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// --- Application -------------------------------------------------------------
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// Function names are prefixed mostly because of curses which clutters the
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@ -1540,145 +1757,12 @@ app_process_termo_event (termo_key_t *event)
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// --- Streams -----------------------------------------------------------------
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// TODO: either move to app_context or write a poller abstraction for cURL
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static struct
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struct stream_tab_task
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{
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CURLM *curl; ///< cURL multi handle
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struct poller_timer timer; ///< cURL timer
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struct poller poller; ///< Poller
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bool polling; ///< Polling
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char curl_error[CURL_ERROR_SIZE]; ///< cURL error info buffer
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CURLcode result; ///< Transfer result
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}
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g_curl;
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static void
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app_curl_collect (curl_socket_t s, int ev_bitmask)
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{
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int running = 0;
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CURLMcode res;
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// XXX: ignoring errors, in particular CURLM_CALL_MULTI_PERFORM
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if ((res = curl_multi_socket_action (g_curl.curl, s, ev_bitmask, &running)))
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print_debug ("cURL: %s", curl_multi_strerror (res));
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CURLMsg *msg;
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while ((msg = curl_multi_info_read (g_curl.curl, &running)))
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{
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// TODO: notify about completion
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if (msg->msg == CURLMSG_DONE)
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{
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(void) msg->easy_handle;
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g_curl.result = msg->data.result;
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g_curl.polling = false;
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}
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}
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}
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static void
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app_curl_on_socket (const struct pollfd *pfd, void *user_data)
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{
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(void) pfd;
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(void) user_data;
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int mask = 0;
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if (pfd->revents & POLLIN) mask |= CURL_CSELECT_IN;
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if (pfd->revents & POLLOUT) mask |= CURL_CSELECT_OUT;
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if (pfd->revents & POLLERR) mask |= CURL_CSELECT_ERR;
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app_curl_collect (pfd->fd, mask);
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}
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static int
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app_curl_on_socket_action (CURL *easy, curl_socket_t s, int what,
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void *user_data, void *socket_data)
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{
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(void) easy;
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(void) user_data;
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// TODO: when we move to the main poller, this should be a linked list
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// so that we can be sure to free it all
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struct poller_fd *fd;
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if (!(fd = socket_data))
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{
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poller_fd_init ((fd = xmalloc (sizeof *fd)), &g_curl.poller, s);
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fd->dispatcher = app_curl_on_socket;
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curl_multi_assign (g_curl.curl, s, fd);
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}
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if (what == CURL_POLL_REMOVE)
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{
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poller_fd_reset (fd);
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free (fd);
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}
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else
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{
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short events = 0;
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if (what == CURL_POLL_IN) events = POLLIN;
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if (what == CURL_POLL_OUT) events = POLLOUT;
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if (what == CURL_POLL_INOUT) events = POLLIN | POLLOUT;
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poller_fd_set (fd, events);
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}
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return 0;
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}
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static void
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app_curl_on_timer (void *user_data)
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{
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(void) user_data;
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app_curl_collect (CURL_SOCKET_TIMEOUT, 0);
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}
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static int
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app_curl_on_timer_change (CURLM *multi, long timeout_ms, void *user_data)
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{
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(void) multi;
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(void) user_data;
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if (timeout_ms < 0)
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poller_timer_reset (&g_curl.timer);
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else
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poller_timer_set (&g_curl.timer, timeout_ms);
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return 0;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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static CURL *
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app_curl_start (const char *uri, struct error **e)
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{
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CURL *easy;
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if (!(easy = curl_easy_init ()))
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{
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error_set (e, "cURL setup failed");
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return NULL;
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}
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// We already take care of SIGPIPE, and native DNS timeouts are only
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// a problem for people without the AsynchDNS feature.
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//
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// Unfortunately, cURL doesn't allow custom callbacks for DNS.
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// The most we could try is parse out the hostname and provide an address
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// override for it using CURLOPT_RESOLVE. Or be our own SOCKS4A/5 proxy.
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CURLcode res;
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if ((res = curl_easy_setopt (easy, CURLOPT_NOSIGNAL, 1L))
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|| (res = curl_easy_setopt (easy, CURLOPT_FOLLOWLOCATION, 1L))
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|| (res = curl_easy_setopt (easy, CURLOPT_NOPROGRESS, 1L))
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// TODO: make the timeout a bit larger once we're asynchronous
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|| (res = curl_easy_setopt (easy, CURLOPT_TIMEOUT, 5L))
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// TODO: the error needs to be one per "CURL *"
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|| (res = curl_easy_setopt (easy, CURLOPT_ERRORBUFFER, g_curl.curl_error))
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// Not checking anything, we just want some data, any data
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|| (res = curl_easy_setopt (easy, CURLOPT_SSL_VERIFYPEER, 0L))
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|| (res = curl_easy_setopt (easy, CURLOPT_SSL_VERIFYHOST, 0L))
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|| (res = curl_easy_setopt (easy, CURLOPT_URL, uri)))
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{
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error_set (e, "%s", curl_easy_strerror (res));
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curl_easy_cleanup (easy);
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return NULL;
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}
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return easy;
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}
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struct poller_curl_task curl; ///< Superclass
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bool polling; ///< Still downloading
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CURLcode result; ///< Operation result
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};
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static size_t
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write_callback (char *ptr, size_t size, size_t nmemb, void *user_data)
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@ -1693,64 +1777,62 @@ write_callback (char *ptr, size_t size, size_t nmemb, void *user_data)
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return size * nmemb;
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}
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// TODO: don't block on this, move this somehow to the main event loop
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static void
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app_download_on_done (CURLMsg *msg, struct poller_curl_task *task)
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{
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struct stream_tab_task *self =
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CONTAINER_OF (task, struct stream_tab_task, curl);
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self->polling = false;
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self->result = msg->data.result;
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}
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static bool
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app_download (const char *uri, struct str *buf, char **content_type,
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struct error **e)
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{
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bool result = false;
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poller_init (&g_curl.poller);
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poller_timer_init (&g_curl.timer, &g_curl.poller);
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g_curl.timer.dispatcher = app_curl_on_timer;
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g_curl.polling = true;
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struct poller poller;
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poller_init (&poller);
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if (!(g_curl.curl = curl_multi_init ()))
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struct poller_curl pc;
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hard_assert (poller_curl_init (&pc, &poller, NULL));
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struct stream_tab_task task;
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hard_assert (poller_curl_spawn (&task.curl, NULL));
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CURL *easy = task.curl.easy;
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bool result = false;
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CURLcode res;
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if ((res = curl_easy_setopt (easy, CURLOPT_FOLLOWLOCATION, 1L))
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|| (res = curl_easy_setopt (easy, CURLOPT_NOPROGRESS, 1L))
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// TODO: make the timeout a bit larger once we're asynchronous
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|| (res = curl_easy_setopt (easy, CURLOPT_TIMEOUT, 5L))
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// Not checking anything, we just want some data, any data
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|| (res = curl_easy_setopt (easy, CURLOPT_SSL_VERIFYPEER, 0L))
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|| (res = curl_easy_setopt (easy, CURLOPT_SSL_VERIFYHOST, 0L))
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|| (res = curl_easy_setopt (easy, CURLOPT_URL, uri))
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|| (res = curl_easy_setopt (easy, CURLOPT_WRITEDATA, buf))
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|| (res = curl_easy_setopt (easy, CURLOPT_WRITEFUNCTION, write_callback)))
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{
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error_set (e, "cURL setup failed");
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error_set (e, "%s: %s", "cURL setup failed", curl_easy_strerror (res));
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goto error_1;
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}
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CURLMcode mres;
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if ((mres = curl_multi_setopt (g_curl.curl,
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CURLMOPT_SOCKETFUNCTION, app_curl_on_socket_action))
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|| (mres = curl_multi_setopt (g_curl.curl,
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CURLMOPT_TIMERFUNCTION, app_curl_on_timer_change)))
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task.curl.on_done = app_download_on_done;
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hard_assert (poller_curl_add (&pc, task.curl.easy, NULL));
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// TODO: don't run a subloop, run the task fully asynchronously
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task.polling = true;
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while (task.polling)
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poller_run (&poller);
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if (task.result
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&& task.result != CURLE_WRITE_ERROR)
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{
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error_set (e, "%s: %s",
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"cURL setup failed", curl_multi_strerror (mres));
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error_set (e, "%s: %s", "download failed", task.curl.curl_error);
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goto error_2;
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}
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CURL *easy;
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if (!(easy = app_curl_start (uri, e)))
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goto error_2;
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CURLcode res;
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if ((res = curl_easy_setopt (easy, CURLOPT_WRITEDATA, buf))
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||||
|| (res = curl_easy_setopt (easy, CURLOPT_WRITEFUNCTION, write_callback)))
|
||||
{
|
||||
error_set (e, "%s: %s", "cURL setup failed", curl_easy_strerror (res));
|
||||
goto error_3;
|
||||
}
|
||||
|
||||
if ((mres = curl_multi_add_handle (g_curl.curl, easy)))
|
||||
{
|
||||
error_set (e, "%s: %s",
|
||||
"cURL setup failed", curl_multi_strerror (mres));
|
||||
goto error_3;
|
||||
}
|
||||
|
||||
poller_timer_set (&g_curl.timer, 0);
|
||||
while (g_curl.polling)
|
||||
poller_run (&g_curl.poller);
|
||||
|
||||
if (g_curl.result
|
||||
&& g_curl.result != CURLE_WRITE_ERROR)
|
||||
{
|
||||
error_set (e, "%s: %s", "download failed", g_curl.curl_error);
|
||||
goto error_4;
|
||||
}
|
||||
|
||||
long code;
|
||||
char *type;
|
||||
if ((res = curl_easy_getinfo (easy, CURLINFO_RESPONSE_CODE, &code))
|
||||
@ -1758,27 +1840,26 @@ app_download (const char *uri, struct str *buf, char **content_type,
|
||||
{
|
||||
error_set (e, "%s: %s",
|
||||
"cURL info retrieval failed", curl_easy_strerror (res));
|
||||
goto error_4;
|
||||
goto error_2;
|
||||
}
|
||||
|
||||
if (code != 200)
|
||||
{
|
||||
error_set (e, "%s: %ld", "unexpected HTTP response code", code);
|
||||
goto error_4;
|
||||
goto error_2;
|
||||
}
|
||||
if (type && content_type)
|
||||
*content_type = xstrdup (type);
|
||||
|
||||
result = true;
|
||||
|
||||
error_4:
|
||||
curl_multi_remove_handle (g_curl.curl, easy);
|
||||
error_3:
|
||||
curl_easy_cleanup (easy);
|
||||
error_2:
|
||||
curl_multi_cleanup (g_curl.curl);
|
||||
hard_assert (poller_curl_remove (&pc, task.curl.easy, NULL));
|
||||
error_1:
|
||||
poller_free (&g_curl.poller);
|
||||
curl_easy_cleanup (task.curl.easy);
|
||||
poller_curl_free (&pc);
|
||||
|
||||
poller_free (&poller);
|
||||
return result;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user