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module-jackdbus-detect.c

/***
  This file is part of PulseAudio.

  Written by David Henningsson <david.henningsson@canonical.com>
  Copyright 2010 Canonical Ltd.

  Some code taken from other parts of PulseAudio, these are
  Copyright 2006-2009 Lennart Poettering

  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2.1 of the License,
  or (at your option) any later version.

  PulseAudio is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <pulse/xmalloc.h>

#include <pulsecore/log.h>
#include <pulsecore/modargs.h>
#include <pulsecore/core-util.h>
#include <pulsecore/dbus-shared.h>

#include "module-jackdbus-detect-symdef.h"

PA_MODULE_AUTHOR("David Henningsson");
PA_MODULE_DESCRIPTION("Adds JACK sink/source ports when JACK is started");
PA_MODULE_LOAD_ONCE(TRUE);
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_USAGE("connect=<connect ports?>");

#define JACK_SERVICE_NAME "org.jackaudio.service"
#define JACK_INTERFACE_NAME "org.jackaudio.JackControl"
#define JACK_INTERFACE_PATH "/org/jackaudio/Controller"

#define SERVICE_FILTER                    \
      "type='signal',"              \
      "sender='" DBUS_SERVICE_DBUS "',"   \
      "interface='" DBUS_INTERFACE_DBUS "',"    \
      "member='NameOwnerChanged',"        \
      "arg0='" JACK_SERVICE_NAME "'"

#define RUNNING_FILTER(_a)                \
      "type='signal',"              \
      "sender='" JACK_SERVICE_NAME "',"   \
      "interface='" JACK_INTERFACE_NAME "',"    \
      "member='" _a "'"

static const char* const valid_modargs[] = {
    "connect",
    NULL
};

#define JACK_SS_SINK 0
#define JACK_SS_SOURCE 1
#define JACK_SS_COUNT 2

static const char* const modnames[JACK_SS_COUNT] = {
    "module-jack-sink",
    "module-jack-source"
};


struct userdata {
    pa_module *module;
    pa_core *core;
    pa_dbus_connection *connection;
    pa_bool_t filter_added, match_added;
    pa_bool_t is_service_started;
    pa_bool_t autoconnect_ports;
    /* Using index here protects us from module unloading without us knowing */
    int jack_module_index[JACK_SS_COUNT];
};


static void ensure_ports_stopped(struct userdata* u) {
    int i;
    pa_assert(u);

    for (i = 0; i < JACK_SS_COUNT; i++)
        if (u->jack_module_index[i]) {
            pa_module_unload_request_by_index(u->core, u->jack_module_index[i], TRUE);
            u->jack_module_index[i] = 0;
            pa_log_info("Stopped %s.", modnames[i]);
        }
}

static void ensure_ports_started(struct userdata* u) {
    int i;
    pa_assert(u);

    for (i = 0; i < JACK_SS_COUNT; i++)
        if (!u->jack_module_index[i]) {
            char* args;
            pa_module* m;
            args = pa_sprintf_malloc("connect=%s", pa_yes_no(u->autoconnect_ports));
            m = pa_module_load(u->core, modnames[i], args);
            pa_xfree(args);

            if (m) {
                pa_log_info("Successfully started %s.", modnames[i]);
                u->jack_module_index[i] = m->index;
            }
            else
                pa_log_info("Failed to start %s.", modnames[i]);
        }
}


static pa_bool_t check_service_started(struct userdata* u) {
    DBusError error;
    DBusMessage *m = NULL, *reply = NULL;
    pa_bool_t new_status = FALSE;
    dbus_bool_t call_result;
    pa_assert(u);

    dbus_error_init(&error);

    /* Just a safety check; it isn't such a big deal if the name disappears just after the call. */
    if (!dbus_bus_name_has_owner(pa_dbus_connection_get(u->connection),
            JACK_SERVICE_NAME, &error)) {
        pa_log_debug("jackdbus isn't running.");
        goto finish;
    }

    if (!(m = dbus_message_new_method_call(JACK_SERVICE_NAME, JACK_INTERFACE_PATH, JACK_INTERFACE_NAME, "IsStarted"))) {
        pa_log("Failed to allocate IsStarted() method call.");
        goto finish;
    }

    if (!(reply = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(u->connection), m, -1, &error))) {
        pa_log("IsStarted() call failed: %s: %s", error.name, error.message);
        goto finish;
    }

    if (!dbus_message_get_args(reply, &error, DBUS_TYPE_BOOLEAN, &call_result, DBUS_TYPE_INVALID)) {
        pa_log("IsStarted() call return failed: %s: %s", error.name, error.message);
        goto finish;
    }

    new_status = call_result;

finish:
    if (m)
        dbus_message_unref(m);
    if (reply)
        dbus_message_unref(reply);

    dbus_error_free(&error);
    if (new_status)
        ensure_ports_started(u);
    else
        ensure_ports_stopped(u);
    u->is_service_started = new_status;
    return new_status;
}

static DBusHandlerResult dbus_filter_handler(DBusConnection *c, DBusMessage *s, void *userdata) {
    struct userdata *u = NULL;
    DBusError error;

    pa_assert(userdata);
    u = ((pa_module*) userdata)->userdata;
    pa_assert(u);

    dbus_error_init(&error);

    if (dbus_message_is_signal(s, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
        const char *name, *old, *new;
        if (!dbus_message_get_args(s, &error,
                                   DBUS_TYPE_STRING, &name,
                                   DBUS_TYPE_STRING, &old,
                                   DBUS_TYPE_STRING, &new,
                                   DBUS_TYPE_INVALID))
            goto finish;
        if (strcmp(name, JACK_SERVICE_NAME))
            goto finish;

        ensure_ports_stopped(u);
        check_service_started(u);
    }

    else if (dbus_message_is_signal(s, JACK_INTERFACE_NAME, "ServerStarted")) {
        ensure_ports_stopped(u);
        check_service_started(u);
    }

    else if (dbus_message_is_signal(s, JACK_INTERFACE_NAME, "ServerStopped")) {
        ensure_ports_stopped(u);
    }

finish:
    dbus_error_free(&error);
    return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}

int pa__init(pa_module *m) {
    DBusError error;
    pa_dbus_connection *connection = NULL;
    struct userdata *u = NULL;
    pa_modargs *ma;

    pa_assert(m);

    dbus_error_init(&error);

    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
        pa_log("Failed to parse module arguments");
        goto fail;
    }

    m->userdata = u = pa_xnew0(struct userdata, 1);
    u->core = m->core;
    u->module = m;
    u->autoconnect_ports = TRUE;

    if (pa_modargs_get_value_boolean(ma, "connect", &u->autoconnect_ports) < 0) {
        pa_log("Failed to parse connect= argument.");
        goto fail;
    }
    pa_modargs_free(ma);

    if (!(connection = pa_dbus_bus_get(m->core, DBUS_BUS_SESSION, &error)) || dbus_error_is_set(&error)) {

        if (connection)
            pa_dbus_connection_unref(connection);

        pa_log_error("Unable to contact D-Bus session bus: %s: %s", error.name, error.message);
        goto fail;
    }
    u->connection = connection;

    if (!dbus_connection_add_filter(pa_dbus_connection_get(connection), dbus_filter_handler, m, NULL)) {
        pa_log_error("Unable to add D-Bus filter");
        goto fail;
    }
    u->filter_added = 1;

    if (pa_dbus_add_matches(
                pa_dbus_connection_get(connection), &error, SERVICE_FILTER,
                RUNNING_FILTER("ServerStarted"), RUNNING_FILTER("ServerStopped"), NULL) < 0) {
        pa_log_error("Unable to subscribe to signals: %s: %s", error.name, error.message);
        goto fail;
    }
    u->match_added = 1;

    check_service_started(u);

    return 0;

fail:
    if (ma)
        pa_modargs_free(ma);

    dbus_error_free(&error);
    pa__done(m);

    return -1;
}

void pa__done(pa_module *m) {
    struct userdata *u;

    pa_assert(m);

    if (!(u = m->userdata))
        return;

    ensure_ports_stopped(u);

    if (u->match_added) {
        pa_dbus_remove_matches(
                pa_dbus_connection_get(u->connection), SERVICE_FILTER,
                RUNNING_FILTER("ServerStarted"), RUNNING_FILTER("ServerStopped"), NULL);
    }

    if (u->filter_added) {
        dbus_connection_remove_filter(pa_dbus_connection_get(u->connection), dbus_filter_handler, m);
    }

    if (u->connection) {
        pa_dbus_connection_unref(u->connection);
    }

    pa_xfree(u);
}

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