Import an MPD client interface
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liberty-proto.c
649
liberty-proto.c
@ -1,7 +1,7 @@
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/*
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* liberty-proto.c: the ultimate C unlibrary: protocols
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*
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* Copyright (c) 2014 - 2015, Přemysl Janouch <p.janouch@gmail.com>
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* Copyright (c) 2014 - 2016, Přemysl Janouch <p.janouch@gmail.com>
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* All rights reserved.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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@ -1300,3 +1300,650 @@ fail:
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}
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#endif
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#ifdef LIBERTY_WANT_PROTO_MPD
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#include <sys/un.h>
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// --- MPD client interface ----------------------------------------------------
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// This is a rather thin MPD client interface intended for basic tasks
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#define MPD_SUBSYSTEM_TABLE(XX) \
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XX (DATABASE, 0, "database") \
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XX (UPDATE, 1, "update") \
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XX (STORED_PLAYLIST, 2, "stored_playlist") \
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XX (PLAYLIST, 3, "playlist") \
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XX (PLAYER, 4, "player") \
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XX (MIXER, 5, "mixer") \
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XX (OUTPUT, 6, "output") \
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XX (OPTIONS, 7, "options") \
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XX (STICKER, 8, "sticker") \
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XX (SUBSCRIPTION, 9, "subscription") \
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XX (MESSAGE, 10, "message")
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enum mpd_subsystem
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{
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#define XX(a, b, c) MPD_SUBSYSTEM_ ## a = (1 << b),
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MPD_SUBSYSTEM_TABLE (XX)
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#undef XX
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MPD_SUBSYSTEM_MAX
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};
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static const char *mpd_subsystem_names[] =
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{
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#define XX(a, b, c) [b] = c,
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MPD_SUBSYSTEM_TABLE (XX)
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#undef XX
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};
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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enum mpd_client_state
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{
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MPD_DISCONNECTED, ///< Not connected
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MPD_CONNECTING, ///< Currently connecting
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MPD_CONNECTED ///< Connected
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};
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struct mpd_response
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{
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bool success; ///< OK or ACK
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// ACK-only fields:
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int error; ///< Numeric error value (ack.h)
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int list_offset; ///< Offset of command in list
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char *current_command; ///< Name of the erroring command
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char *message_text; ///< Error message
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};
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/// Task completion callback
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typedef void (*mpd_client_task_cb) (const struct mpd_response *response,
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const struct str_vector *data, void *user_data);
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struct mpd_client_task
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{
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LIST_HEADER (struct mpd_client_task)
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mpd_client_task_cb callback; ///< Callback on completion
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void *user_data; ///< User data
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};
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struct mpd_client
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{
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struct poller *poller; ///< Poller
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// Connection:
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enum mpd_client_state state; ///< Connection state
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struct connector *connector; ///< Connection establisher
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int socket; ///< MPD socket
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struct str read_buffer; ///< Input yet to be processed
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struct str write_buffer; ///< Outut yet to be be sent out
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struct poller_fd socket_event; ///< We can read from the socket
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struct poller_timer timeout_timer; ///< Connection seems to be dead
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// Protocol:
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bool got_hello; ///< Got the OK MPD hello message
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bool idling; ///< Sent idle as the last command
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unsigned idling_subsystems; ///< Subsystems we're idling for
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bool in_list; ///< We're inside a command list
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struct mpd_client_task *tasks; ///< Task queue
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struct mpd_client_task *tasks_tail; ///< Tail of task queue
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struct str_vector data; ///< Data from last command
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// User configuration:
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void *user_data; ///< User data for callbacks
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/// Callback after connection has been successfully established
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void (*on_connected) (void *user_data);
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/// Callback for general failures or even normal disconnection;
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/// the interface is reinitialized
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void (*on_failure) (void *user_data);
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/// Callback to receive "idle" updates.
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/// Remember to restart the idle if needed.
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void (*on_event) (unsigned subsystems, void *user_data);
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/// Callback to trace protocol I/O
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void (*on_io_hook) (void *user_data, bool outgoing, const char *line);
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};
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static void mpd_client_reset (struct mpd_client *self);
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static void mpd_client_destroy_connector (struct mpd_client *self);
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static void
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mpd_client_init (struct mpd_client *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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str_init (&self->read_buffer);
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str_init (&self->write_buffer);
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str_vector_init (&self->data);
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poller_fd_init (&self->socket_event, poller, -1);
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poller_timer_init (&self->timeout_timer, poller);
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}
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static void
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mpd_client_free (struct mpd_client *self)
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{
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// So that we don't have to repeat most of the stuff
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mpd_client_reset (self);
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str_free (&self->read_buffer);
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str_free (&self->write_buffer);
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str_vector_free (&self->data);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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/// Reinitialize the interface so that you can reconnect anew
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static void
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mpd_client_reset (struct mpd_client *self)
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{
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if (self->state == MPD_CONNECTING)
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mpd_client_destroy_connector (self);
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if (self->socket != -1)
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xclose (self->socket);
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self->socket = -1;
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self->socket_event.closed = true;
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poller_fd_reset (&self->socket_event);
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poller_timer_reset (&self->timeout_timer);
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str_reset (&self->read_buffer);
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str_reset (&self->write_buffer);
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str_vector_reset (&self->data);
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self->got_hello = false;
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self->idling = false;
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self->idling_subsystems = 0;
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self->in_list = false;
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LIST_FOR_EACH (struct mpd_client_task, iter, self->tasks)
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free (iter);
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self->tasks = self->tasks_tail = NULL;
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self->state = MPD_DISCONNECTED;
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}
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static void
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mpd_client_fail (struct mpd_client *self)
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{
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mpd_client_reset (self);
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if (self->on_failure)
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self->on_failure (self->user_data);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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static bool
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mpd_client_parse_response (const char *p, struct mpd_response *response)
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{
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if (!strcmp (p, "OK"))
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return response->success = true;
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if (!strcmp (p, "list_OK"))
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// TODO: either implement this or fail the connection properly
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hard_assert (!"command_list_ok_begin not implemented");
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char *end = NULL;
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if (*p++ != 'A' || *p++ != 'C' || *p++ != 'K' || *p++ != ' ' || *p++ != '[')
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return false;
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errno = 0;
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response->error = strtoul (p, &end, 10);
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if (errno != 0 || end == p)
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return false;
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p = end;
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if (*p++ != '@')
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return false;
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errno = 0;
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response->list_offset = strtoul (p, &end, 10);
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if (errno != 0 || end == p)
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return false;
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p = end;
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if (*p++ != ']' || *p++ != ' ' || *p++ != '{' || !(end = strchr (p, '}')))
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return false;
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response->current_command = xstrndup (p, end - p);
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p = end + 1;
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if (*p++ != ' ')
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return false;
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response->message_text = xstrdup (p);
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response->success = false;
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return true;
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}
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static void
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mpd_client_dispatch (struct mpd_client *self, struct mpd_response *response)
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{
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struct mpd_client_task *task;
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if (!(task = self->tasks))
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return;
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if (task->callback)
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task->callback (response, &self->data, task->user_data);
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str_vector_reset (&self->data);
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LIST_UNLINK_WITH_TAIL (self->tasks, self->tasks_tail, task);
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free (task);
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}
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static bool
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mpd_client_parse_hello (struct mpd_client *self, const char *line)
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{
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const char hello[] = "OK MPD ";
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if (strncmp (line, hello, sizeof hello - 1))
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{
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print_debug ("invalid MPD hello message");
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return false;
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}
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// TODO: call "on_connected" now. We should however also set up a timer
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// so that we don't wait on this message forever.
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return self->got_hello = true;
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}
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static bool
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mpd_client_parse_line (struct mpd_client *self, const char *line)
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{
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if (self->on_io_hook)
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self->on_io_hook (self->user_data, false, line);
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if (!self->got_hello)
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return mpd_client_parse_hello (self, line);
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struct mpd_response response;
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memset (&response, 0, sizeof response);
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if (mpd_client_parse_response (line, &response))
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{
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mpd_client_dispatch (self, &response);
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free (response.current_command);
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free (response.message_text);
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}
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else
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str_vector_add (&self->data, line);
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return true;
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}
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/// All output from MPD commands seems to be in a trivial "key: value" format
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static char *
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mpd_client_parse_kv (char *line, char **value)
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{
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char *sep;
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if (!(sep = strstr (line, ": ")))
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return NULL;
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*sep = 0;
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*value = sep + 2;
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return line;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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static void
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mpd_client_update_poller (struct mpd_client *self)
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{
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poller_fd_set (&self->socket_event,
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self->write_buffer.len ? (POLLIN | POLLOUT) : POLLIN);
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}
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static bool
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mpd_client_process_input (struct mpd_client *self)
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{
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// Split socket input at newlines and process them separately
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struct str *rb = &self->read_buffer;
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char *start = rb->str, *end = start + rb->len;
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for (char *p = start; p < end; p++)
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{
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if (*p != '\n')
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continue;
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*p = 0;
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if (!mpd_client_parse_line (self, start))
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return false;
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start = p + 1;
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}
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str_remove_slice (rb, 0, start - rb->str);
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return true;
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}
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static void
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mpd_client_on_ready (const struct pollfd *pfd, void *user_data)
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{
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(void) pfd;
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struct mpd_client *self = user_data;
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if (socket_io_try_read (self->socket, &self->read_buffer) != SOCKET_IO_OK
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|| !mpd_client_process_input (self)
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|| socket_io_try_write (self->socket, &self->write_buffer) != SOCKET_IO_OK)
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mpd_client_fail (self);
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else
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mpd_client_update_poller (self);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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static bool
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mpd_client_must_quote_char (char c)
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{
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return (unsigned char) c <= ' ' || c == '"' || c == '\'';
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}
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static bool
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mpd_client_must_quote (const char *s)
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{
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if (!*s)
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return true;
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for (; *s; s++)
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if (mpd_client_must_quote_char (*s))
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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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mpd_client_quote (const char *s, struct str *output)
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{
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str_append_c (output, '"');
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for (; *s; s++)
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{
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if (mpd_client_must_quote_char (*s))
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str_append_c (output, '\\');
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str_append_c (output, *s);
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}
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str_append_c (output, '"');
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}
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/// Beware that delivery of the event isn't deferred and you musn't make
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/// changes to the interface while processing the event!
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static void
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mpd_client_add_task
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(struct mpd_client *self, mpd_client_task_cb cb, void *user_data)
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{
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// This only has meaning with command_list_ok_begin, and then it requires
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// special handling (all in-list tasks need to be specially marked and
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// later flushed if an early ACK or OK arrives).
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hard_assert (!self->in_list);
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struct mpd_client_task *task = xcalloc (1, sizeof *self);
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task->callback = cb;
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task->user_data = user_data;
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LIST_APPEND_WITH_TAIL (self->tasks, self->tasks_tail, task);
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}
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/// Send a command. Remember to call mpd_client_add_task() to handle responses,
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/// unless the command is being sent in a list.
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static void mpd_client_send_command
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(struct mpd_client *self, const char *command, ...) ATTRIBUTE_SENTINEL;
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static void
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mpd_client_send_commandv (struct mpd_client *self, char **commands)
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{
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// Automatically interrupt idle mode
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if (self->idling)
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{
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poller_timer_reset (&self->timeout_timer);
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self->idling = false;
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self->idling_subsystems = 0;
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mpd_client_send_command (self, "noidle", NULL);
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}
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struct str line;
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str_init (&line);
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for (; *commands; commands++)
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{
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if (line.len)
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str_append_c (&line, ' ');
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if (mpd_client_must_quote (*commands))
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mpd_client_quote (*commands, &line);
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else
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str_append (&line, *commands);
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}
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if (self->on_io_hook)
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self->on_io_hook (self->user_data, true, line.str);
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str_append_c (&line, '\n');
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str_append_str (&self->write_buffer, &line);
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str_free (&line);
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mpd_client_update_poller (self);
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}
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static void
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mpd_client_send_command (struct mpd_client *self, const char *command, ...)
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{
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struct str_vector v;
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str_vector_init (&v);
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va_list ap;
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va_start (ap, command);
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for (; command; command = va_arg (ap, const char *))
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str_vector_add (&v, command);
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va_end (ap);
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mpd_client_send_commandv (self, v.vector);
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str_vector_free (&v);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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static void
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mpd_client_list_begin (struct mpd_client *self)
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{
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hard_assert (!self->in_list);
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mpd_client_send_command (self, "command_list_begin", NULL);
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self->in_list = true;
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}
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/// End a list of commands. Remember to call mpd_client_add_task()
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/// to handle the summary response.
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static void
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mpd_client_list_end (struct mpd_client *self)
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{
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hard_assert (self->in_list);
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mpd_client_send_command (self, "command_list_end", NULL);
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self->in_list = false;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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static bool
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mpd_resolve_subsystem (const char *name, unsigned *output)
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{
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for (size_t i = 0; i < N_ELEMENTS (mpd_subsystem_names); i++)
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if (!strcasecmp_ascii (name, mpd_subsystem_names[i]))
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{
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*output |= 1 << i;
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return true;
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}
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return false;
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}
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static void
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mpd_client_on_idle_return (const struct mpd_response *response,
|
||||
const struct str_vector *data, void *user_data)
|
||||
{
|
||||
(void) response;
|
||||
|
||||
struct mpd_client *self = user_data;
|
||||
unsigned subsystems = 0;
|
||||
for (size_t i = 0; i < data->len; i++)
|
||||
{
|
||||
char *value, *key;
|
||||
if (!(key = mpd_client_parse_kv (data->vector[i], &value)))
|
||||
print_debug ("%s: %s", "erroneous MPD output", data->vector[i]);
|
||||
else if (strcasecmp_ascii (key, "changed"))
|
||||
print_debug ("%s: %s", "unexpected idle key", key);
|
||||
else if (!mpd_resolve_subsystem (value, &subsystems))
|
||||
print_debug ("%s: %s", "unknown subsystem", value);
|
||||
}
|
||||
|
||||
// Not resetting "idling" here, we may send an extra "noidle" no problem
|
||||
if (self->on_event && subsystems)
|
||||
self->on_event (subsystems, self->user_data);
|
||||
}
|
||||
|
||||
static void mpd_client_idle (struct mpd_client *self, unsigned subsystems);
|
||||
|
||||
static void
|
||||
mpd_client_on_timeout (void *user_data)
|
||||
{
|
||||
struct mpd_client *self = user_data;
|
||||
|
||||
// Abort and immediately restore the current idle so that MPD doesn't
|
||||
// disconnect us, even though the documentation says this won't happen.
|
||||
// Just sending this out should bring a dead connection down over TCP.
|
||||
// TODO: set another timer to make sure we get a reply
|
||||
mpd_client_idle (self, self->idling_subsystems);
|
||||
}
|
||||
|
||||
/// When not expecting to send any further commands, you should call this
|
||||
/// in order to keep the connection alive. Or to receive updates.
|
||||
static void
|
||||
mpd_client_idle (struct mpd_client *self, unsigned subsystems)
|
||||
{
|
||||
hard_assert (!self->in_list);
|
||||
|
||||
struct str_vector v;
|
||||
str_vector_init (&v);
|
||||
|
||||
str_vector_add (&v, "idle");
|
||||
for (size_t i = 0; i < N_ELEMENTS (mpd_subsystem_names); i++)
|
||||
if (subsystems & (1 << i))
|
||||
str_vector_add (&v, mpd_subsystem_names[i]);
|
||||
|
||||
mpd_client_send_commandv (self, v.vector);
|
||||
str_vector_free (&v);
|
||||
|
||||
self->timeout_timer.dispatcher = mpd_client_on_timeout;
|
||||
self->timeout_timer.user_data = self;
|
||||
poller_timer_set (&self->timeout_timer, 5 * 60 * 1000);
|
||||
|
||||
mpd_client_add_task (self, mpd_client_on_idle_return, self);
|
||||
self->idling = true;
|
||||
self->idling_subsystems = subsystems;
|
||||
}
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
|
||||
static void
|
||||
mpd_client_finish_connection (struct mpd_client *self, int socket)
|
||||
{
|
||||
set_blocking (socket, false);
|
||||
self->socket = socket;
|
||||
self->state = MPD_CONNECTED;
|
||||
|
||||
poller_fd_init (&self->socket_event, self->poller, self->socket);
|
||||
self->socket_event.dispatcher = mpd_client_on_ready;
|
||||
self->socket_event.user_data = self;
|
||||
|
||||
mpd_client_update_poller (self);
|
||||
|
||||
if (self->on_connected)
|
||||
self->on_connected (self->user_data);
|
||||
}
|
||||
|
||||
static void
|
||||
mpd_client_destroy_connector (struct mpd_client *self)
|
||||
{
|
||||
if (self->connector)
|
||||
connector_free (self->connector);
|
||||
free (self->connector);
|
||||
self->connector = NULL;
|
||||
|
||||
// Not connecting anymore
|
||||
self->state = MPD_DISCONNECTED;
|
||||
}
|
||||
|
||||
static void
|
||||
mpd_client_on_connector_failure (void *user_data)
|
||||
{
|
||||
struct mpd_client *self = user_data;
|
||||
mpd_client_destroy_connector (self);
|
||||
mpd_client_fail (self);
|
||||
}
|
||||
|
||||
static void
|
||||
mpd_client_on_connector_connected
|
||||
(void *user_data, int socket, const char *host)
|
||||
{
|
||||
(void) host;
|
||||
|
||||
struct mpd_client *self = user_data;
|
||||
mpd_client_destroy_connector (self);
|
||||
mpd_client_finish_connection (self, socket);
|
||||
}
|
||||
|
||||
static bool
|
||||
mpd_client_connect_unix (struct mpd_client *self, const char *address,
|
||||
struct error **e)
|
||||
{
|
||||
int fd = socket (AF_UNIX, SOCK_STREAM, 0);
|
||||
if (fd == -1)
|
||||
return error_set (e, "%s: %s", "socket", strerror (errno));
|
||||
|
||||
// Expand tilde if needed
|
||||
char *expanded = resolve_filename (address, xstrdup);
|
||||
|
||||
struct sockaddr_un sun;
|
||||
sun.sun_family = AF_UNIX;
|
||||
strncpy (sun.sun_path, expanded, sizeof sun.sun_path);
|
||||
sun.sun_path[sizeof sun.sun_path - 1] = 0;
|
||||
|
||||
free (expanded);
|
||||
|
||||
if (connect (fd, (struct sockaddr *) &sun, sizeof sun))
|
||||
return error_set (e, "%s: %s", "connect", strerror (errno));
|
||||
|
||||
mpd_client_finish_connection (self, fd);
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool
|
||||
mpd_client_connect (struct mpd_client *self, const char *address,
|
||||
const char *service, struct error **e)
|
||||
{
|
||||
hard_assert (self->state == MPD_DISCONNECTED);
|
||||
|
||||
// If it looks like a path, assume it's a UNIX socket
|
||||
if (strchr (address, '/'))
|
||||
return mpd_client_connect_unix (self, address, e);
|
||||
|
||||
struct connector *connector = xmalloc (sizeof *connector);
|
||||
connector_init (connector, self->poller);
|
||||
self->connector = connector;
|
||||
|
||||
connector->user_data = self;
|
||||
connector->on_connected = mpd_client_on_connector_connected;
|
||||
connector->on_failure = mpd_client_on_connector_failure;
|
||||
|
||||
connector_add_target (connector, address, service);
|
||||
self->state = MPD_CONNECTING;
|
||||
return true;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
@ -22,12 +22,16 @@
|
||||
#define PROGRAM_VERSION "0"
|
||||
|
||||
#define LIBERTY_WANT_SSL
|
||||
// The MPD client is a full wrapper and needs the network
|
||||
#define LIBERTY_WANT_POLLER
|
||||
#define LIBERTY_WANT_ASYNC
|
||||
|
||||
#define LIBERTY_WANT_PROTO_IRC
|
||||
#define LIBERTY_WANT_PROTO_HTTP
|
||||
#define LIBERTY_WANT_PROTO_SCGI
|
||||
#define LIBERTY_WANT_PROTO_FASTCGI
|
||||
#define LIBERTY_WANT_PROTO_WS
|
||||
#define LIBERTY_WANT_PROTO_MPD
|
||||
|
||||
#include "../liberty.c"
|
||||
|
||||
@ -201,7 +205,7 @@ main (int argc, char *argv[])
|
||||
test_add_simple (&test, "/http-parser", NULL, test_http_parser);
|
||||
test_add_simple (&test, "/scgi-parser", NULL, test_scgi_parser);
|
||||
test_add_simple (&test, "/websockets", NULL, test_websockets);
|
||||
// TODO: test FastCGI
|
||||
// TODO: test FastCGI and MPD
|
||||
|
||||
return test_run (&test);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user