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janus_mqtt.c
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janus_mqtt.c
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/*! \file janus_mqtt.c
* \author Andrei Nesterov <[email protected]>
* \copyright GNU General Public License v3
* \brief Janus MQTT transport plugin
* \details This is an implementation of a MQTT transport for the Janus API,
* using the Eclipse Paho C Client library (https://eclipse.org/paho/clients/c).
* This means that this module adds support for MQTT based messaging as
* an alternative "transport" for API requests, responses and notifications.
* This is only useful when you're handling the communication with
* clients your own way. Right now, you can only configure
* the address of the MQTT broker to use, and the queues to
* make use of to receive (to-janus) and send (from-janus) messages
* from/to an external application. As with WebSockets, considering that
* requests wouldn't include a path to address some mandatory information,
* these requests addressed to Janus should include as part of their payload,
* when needed, additional pieces of information like \c session_id and
* \c handle_id. That is, where you'd send a Janus request related to a
* specific session to the \c /janus/<session> path, with MQTT
* you'd have to send the same request with an additional \c session_id
* field in the JSON payload.
* \note When you create a session using MQTT, a subscription to the
* events related to it is done automatically through the outgoing queue,
* so no need for an explicit request as the GET in the plain HTTP API.
*
* \ingroup transports
* \ref transports
*/
#include "transport.h"
#include <MQTTAsync.h>
#include "../debug.h"
#include "../config.h"
#include "../utils.h"
/* Transport plugin information */
#define JANUS_MQTT_VERSION 1
#define JANUS_MQTT_VERSION_STRING "0.0.1"
#define JANUS_MQTT_DESCRIPTION "This transport plugin adds MQTT support to the Janus API via Paho client library."
#define JANUS_MQTT_NAME "JANUS MQTT transport plugin"
#define JANUS_MQTT_AUTHOR "Andrei Nesterov <[email protected]>"
#define JANUS_MQTT_PACKAGE "janus.transport.mqtt"
/* Transport methods */
janus_transport *create(void);
int janus_mqtt_init(janus_transport_callbacks *callback, const char *config_path);
void janus_mqtt_destroy(void);
int janus_mqtt_get_api_compatibility(void);
int janus_mqtt_get_version(void);
const char *janus_mqtt_get_version_string(void);
const char *janus_mqtt_get_description(void);
const char *janus_mqtt_get_name(void);
const char *janus_mqtt_get_author(void);
const char *janus_mqtt_get_package(void);
gboolean janus_mqtt_is_janus_api_enabled(void);
gboolean janus_mqtt_is_admin_api_enabled(void);
int janus_mqtt_send_message(janus_transport_session *transport, void *request_id, gboolean admin, json_t *message);
void janus_mqtt_session_created(janus_transport_session *transport, guint64 session_id);
void janus_mqtt_session_over(janus_transport_session *transport, guint64 session_id, gboolean timeout, gboolean claimed);
void janus_mqtt_session_claimed(janus_transport_session *transport, guint64 session_id);
#define JANUS_MQTT_VERSION_3_1 "3.1"
#define JANUS_MQTT_VERSION_3_1_1 "3.1.1"
#define JANUS_MQTT_VERSION_5 "5"
#define JANUS_MQTT_VERSION_DEFAULT JANUS_MQTT_VERSION_3_1_1
#define JANUS_MQTT_DEFAULT_STATUS_TOPIC "status"
#define JANUS_MQTT_DEFAULT_STATUS_QOS 1
/* Transport setup */
static janus_transport janus_mqtt_transport_ =
JANUS_TRANSPORT_INIT (
.init = janus_mqtt_init,
.destroy = janus_mqtt_destroy,
.get_api_compatibility = janus_mqtt_get_api_compatibility,
.get_version = janus_mqtt_get_version,
.get_version_string = janus_mqtt_get_version_string,
.get_description = janus_mqtt_get_description,
.get_name = janus_mqtt_get_name,
.get_author = janus_mqtt_get_author,
.get_package = janus_mqtt_get_package,
.is_janus_api_enabled = janus_mqtt_is_janus_api_enabled,
.is_admin_api_enabled = janus_mqtt_is_admin_api_enabled,
.send_message = janus_mqtt_send_message,
.session_created = janus_mqtt_session_created,
.session_over = janus_mqtt_session_over,
.session_claimed = janus_mqtt_session_claimed,
);
/* Transport creator */
janus_transport *create(void) {
JANUS_LOG(LOG_VERB, "%s created!\n", JANUS_MQTT_NAME);
return &janus_mqtt_transport_;
}
/* API flags */
static gboolean janus_mqtt_api_enabled_ = FALSE;
static gboolean janus_mqtt_admin_api_enabled_ = FALSE;
/* Event handlers */
static gboolean notify_events = TRUE;
/* JSON serialization options */
static size_t json_format_ = JSON_INDENT(3) | JSON_PRESERVE_ORDER;
/* MQTT client context */
typedef struct janus_mqtt_context {
janus_transport_callbacks *gateway;
MQTTAsync client;
struct {
int mqtt_version;
int keep_alive_interval;
int cleansession;
char *username;
char *password;
} connect;
struct {
int timeout;
} disconnect;
/* If we loose connection, the will is our last publish */
struct {
gboolean enabled;
char *connect_message;
char *disconnect_message;
char *topic;
int qos;
gboolean retain;
} status;
struct {
char *topic;
int qos;
} subscribe;
struct {
char *topic;
int qos;
gboolean retain;
} publish;
struct {
struct {
char *topic;
int qos;
} subscribe;
struct {
char *topic;
int qos;
} publish;
} admin;
/* SSL config, if needed */
gboolean ssl_enabled;
char *cacert_file;
char *cert_file;
char *key_file;
gboolean verify_peer;
} janus_mqtt_context;
/* Transport client methods */
void janus_mqtt_client_connected(void *context, char *cause);
void janus_mqtt_client_disconnected(void *context, MQTTProperties *properties, enum MQTTReasonCodes reasonCode);
void janus_mqtt_client_connection_lost(void *context, char *cause);
int janus_mqtt_client_message_arrived(void *context, char *topicName, int topicLen, MQTTAsync_message *message);
int janus_mqtt_client_connect(janus_mqtt_context *ctx);
int janus_mqtt_client_reconnect(janus_mqtt_context *ctx);
int janus_mqtt_client_disconnect(janus_mqtt_context *ctx);
int janus_mqtt_client_subscribe(janus_mqtt_context *ctx, gboolean admin);
int janus_mqtt_client_publish_message(janus_mqtt_context *ctx, char *payload, gboolean admin);
int janus_mqtt_client_publish_status_message(janus_mqtt_context *ctx, char *payload);
void janus_mqtt_client_destroy_context(janus_mqtt_context **ctx);
/* MQTT v3.x interface callbacks */
void janus_mqtt_client_connect_failure(void *context, MQTTAsync_failureData *response);
void janus_mqtt_client_reconnect_success(void *context, MQTTAsync_successData *response);
void janus_mqtt_client_reconnect_failure(void *context, MQTTAsync_failureData *response);
void janus_mqtt_client_disconnect_success(void *context, MQTTAsync_successData *response);
void janus_mqtt_client_disconnect_failure(void *context, MQTTAsync_failureData *response);
void janus_mqtt_client_subscribe_success(void *context, MQTTAsync_successData *response);
void janus_mqtt_client_subscribe_failure(void *context, MQTTAsync_failureData *response);
void janus_mqtt_client_admin_subscribe_success(void *context, MQTTAsync_successData *response);
void janus_mqtt_client_admin_subscribe_failure(void *context, MQTTAsync_failureData *response);
void janus_mqtt_client_publish_janus_success(void *context, MQTTAsync_successData *response);
void janus_mqtt_client_publish_janus_failure(void *context, MQTTAsync_failureData *response);
void janus_mqtt_client_publish_admin_success(void *context, MQTTAsync_successData *response);
void janus_mqtt_client_publish_admin_failure(void *context, MQTTAsync_failureData *response);
void janus_mqtt_client_publish_status_success(void *context, MQTTAsync_successData *response);
void janus_mqtt_client_publish_status_failure(void *context, MQTTAsync_failureData *response);
int janus_mqtt_client_get_response_code(MQTTAsync_failureData *response);
#ifdef MQTTVERSION_5
/* MQTT v5 interface callbacks */
void janus_mqtt_client_connect_failure5(void *context, MQTTAsync_failureData5 *response);
void janus_mqtt_client_reconnect_success5(void *context, MQTTAsync_successData5 *response);
void janus_mqtt_client_reconnect_failure5(void *context, MQTTAsync_failureData5 *response);
void janus_mqtt_client_disconnect_success5(void *context, MQTTAsync_successData5 *response);
void janus_mqtt_client_disconnect_failure5(void *context, MQTTAsync_failureData5 *response);
void janus_mqtt_client_subscribe_success5(void *context, MQTTAsync_successData5 *response);
void janus_mqtt_client_subscribe_failure5(void *context, MQTTAsync_failureData5 *response);
void janus_mqtt_client_admin_subscribe_success5(void *context, MQTTAsync_successData5 *response);
void janus_mqtt_client_admin_subscribe_failure5(void *context, MQTTAsync_failureData5 *response);
void janus_mqtt_client_publish_janus_success5(void *context, MQTTAsync_successData5 *response);
void janus_mqtt_client_publish_janus_failure5(void *context, MQTTAsync_failureData5 *response);
void janus_mqtt_client_publish_admin_success5(void *context, MQTTAsync_successData5 *response);
void janus_mqtt_client_publish_admin_failure5(void *context, MQTTAsync_failureData5 *response);
void janus_mqtt_client_publish_status_success5(void *context, MQTTAsync_successData5 *response);
void janus_mqtt_client_publish_status_failure5(void *context, MQTTAsync_failureData5 *response);
int janus_mqtt_client_get_response_code5(MQTTAsync_failureData5 *response);
#endif
/* MQTT version independent callback implementations */
void janus_mqtt_client_reconnect_success_impl(void *context);
void janus_mqtt_client_connect_failure_impl(void *context, int rc);
void janus_mqtt_client_reconnect_failure_impl(void *context, int rc);
void janus_mqtt_client_disconnect_success_impl(void *context);
void janus_mqtt_client_disconnect_failure_impl(void *context, int rc);
void janus_mqtt_client_subscribe_success_impl(void *context);
void janus_mqtt_client_subscribe_failure_impl(void *context, int rc);
void janus_mqtt_client_admin_subscribe_success_impl(void *context);
void janus_mqtt_client_admin_subscribe_failure_impl(void *context, int rc);
void janus_mqtt_client_publish_janus_success_impl(void *context);
void janus_mqtt_client_publish_janus_failure_impl(void *context, int rc);
void janus_mqtt_client_publish_admin_success_impl(void *context);
void janus_mqtt_client_publish_admin_failure_impl(void *context, int rc);
void janus_mqtt_client_publish_status_success_impl(void *context);
void janus_mqtt_client_publish_status_failure_impl(void *context, int rc);
/* We only handle a single client */
static janus_mqtt_context *context_ = NULL;
static janus_transport_session *mqtt_session = NULL;
int janus_mqtt_init(janus_transport_callbacks *callback, const char *config_path) {
if(callback == NULL || config_path == NULL) {
/* Invalid arguments */
return -1;
}
/* Initializing context */
janus_mqtt_context *ctx = g_malloc0(sizeof(struct janus_mqtt_context));
ctx->gateway = callback;
context_ = ctx;
/* Set default values */
/* Strings are set to default values later */
ctx->status.enabled = FALSE;
ctx->status.qos = JANUS_MQTT_DEFAULT_STATUS_QOS;
ctx->status.retain = FALSE;
/* Prepare the transport session (again, just one) */
mqtt_session = janus_transport_session_create(context_, NULL);
/* Read configuration */
char filename[255];
g_snprintf(filename, 255, "%s/%s.jcfg", config_path, JANUS_MQTT_PACKAGE);
JANUS_LOG(LOG_VERB, "Configuration file: %s\n", filename);
janus_config *config = janus_config_parse(filename);
if(config == NULL) {
JANUS_LOG(LOG_WARN, "Couldn't find .jcfg configuration file (%s), trying .cfg\n", JANUS_MQTT_PACKAGE);
g_snprintf(filename, 255, "%s/%s.cfg", config_path, JANUS_MQTT_PACKAGE);
JANUS_LOG(LOG_VERB, "Configuration file: %s\n", filename);
config = janus_config_parse(filename);
}
if(config != NULL) {
janus_config_print(config);
}
janus_config_category *config_general = janus_config_get_create(config, NULL, janus_config_type_category, "general");
janus_config_category *config_admin = janus_config_get_create(config, NULL, janus_config_type_category, "admin");
janus_config_category *config_status = janus_config_get_create(config, NULL, janus_config_type_category, "status");
/* Handle configuration */
janus_config_item *url_item = janus_config_get(config, config_general, janus_config_type_item, "url");
const char *url = g_strdup((url_item && url_item->value) ? url_item->value : "tcp:https://localhost:1883");
janus_config_item *client_id_item = janus_config_get(config, config_general, janus_config_type_item, "client_id");
const char *client_id = g_strdup((client_id_item && client_id_item->value) ? client_id_item->value : "guest");
janus_config_item *username_item = janus_config_get(config, config_general, janus_config_type_item, "username");
ctx->connect.username = g_strdup((username_item && username_item->value) ? username_item->value : "guest");
janus_config_item *password_item = janus_config_get(config, config_general, janus_config_type_item, "password");
ctx->connect.password = g_strdup((password_item && password_item->value) ? password_item->value : "guest");
janus_config_item *json_item = janus_config_get(config, config_general, janus_config_type_item, "json");
if(json_item && json_item->value) {
/* Check how we need to format/serialize the JSON output */
if(!strcasecmp(json_item->value, "indented")) {
/* Default: indented, we use three spaces for that */
json_format_ = JSON_INDENT(3) | JSON_PRESERVE_ORDER;
} else if(!strcasecmp(json_item->value, "plain")) {
/* Not indented and no new lines, but still readable */
json_format_ = JSON_INDENT(0) | JSON_PRESERVE_ORDER;
} else if(!strcasecmp(json_item->value, "compact")) {
/* Compact, so no spaces between separators */
json_format_ = JSON_COMPACT | JSON_PRESERVE_ORDER;
} else {
JANUS_LOG(LOG_WARN, "Unsupported JSON format option '%s', using default (indented)\n", json_item->value);
json_format_ = JSON_INDENT(3) | JSON_PRESERVE_ORDER;
}
}
/* Check if we need to send events to handlers */
janus_config_item *events_item = janus_config_get(config, config_general, janus_config_type_item, "events");
if(events_item && events_item->value)
notify_events = janus_is_true(events_item->value);
if(!notify_events && callback->events_is_enabled()) {
JANUS_LOG(LOG_WARN, "Notification of events to handlers disabled for %s\n", JANUS_MQTT_NAME);
}
/* Check if we need to enable SSL support */
janus_config_item *ssl_item = janus_config_get(config, config_general, janus_config_type_item, "ssl_enabled");
if(ssl_item == NULL) {
/* Try legacy property */
ssl_item = janus_config_get(config, config_general, janus_config_type_item, "ssl_enable");
if (ssl_item && ssl_item->value) {
JANUS_LOG(LOG_WARN, "Found deprecated 'ssl_enable' property, please update it to 'ssl_enabled' instead\n");
}
}
if(ssl_item && ssl_item->value && janus_is_true(ssl_item->value)) {
if(strstr(url, "ssl:https://") != url)
JANUS_LOG(LOG_WARN, "SSL enabled, but MQTT url doesn't start with ssl:https://...\n");
ctx->ssl_enabled = TRUE;
janus_config_item *cacertfile = janus_config_get(config, config_general, janus_config_type_item, "cacertfile");
if(!cacertfile || !cacertfile->value) {
JANUS_LOG(LOG_FATAL, "Missing CA certificate for MQTT integration...\n");
goto error;
}
ctx->cacert_file = g_strdup(cacertfile->value);
janus_config_item *certfile = janus_config_get(config, config_general, janus_config_type_item, "certfile");
ctx->cert_file = (certfile && certfile->value) ? g_strdup(certfile->value) : NULL;
janus_config_item *keyfile = janus_config_get(config, config_general, janus_config_type_item, "keyfile");
ctx->key_file = (keyfile && keyfile->value) ? g_strdup(keyfile->value) : NULL;
if(ctx->cert_file && !ctx->key_file) {
JANUS_LOG(LOG_FATAL, "Certificate is set but key isn't for MQTT integration...\n");
goto error;
}
if(!ctx->cert_file && ctx->key_file) {
JANUS_LOG(LOG_FATAL, "Key is set but certificate isn't for MQTT integration...\n");
goto error;
}
janus_config_item *verify = janus_config_get(config, config_general, janus_config_type_item, "verify_peer");
ctx->verify_peer = (verify && verify->value && janus_is_true(verify->value)) ? TRUE : FALSE;
} else {
JANUS_LOG(LOG_INFO, "MQTT SSL support disabled\n");
if(strstr(url, "ssl:https://") == url)
JANUS_LOG(LOG_WARN, "SSL disabled, but MQTT url starts with ssl:https:// instead of tcp:https://...\n");
}
/* Connect configuration */
janus_config_item *mqtt_version = janus_config_get(config, config_general, janus_config_type_item, "mqtt_version");
const char *mqtt_version_str = (mqtt_version && mqtt_version->value) ? mqtt_version->value : JANUS_MQTT_VERSION_DEFAULT;
if(strcmp(mqtt_version_str, JANUS_MQTT_VERSION_3_1) == 0) {
ctx->connect.mqtt_version = MQTTVERSION_3_1;
} else if(strcmp(mqtt_version_str, JANUS_MQTT_VERSION_3_1_1) == 0) {
ctx->connect.mqtt_version = MQTTVERSION_3_1_1;
} else if(strcmp(mqtt_version_str, JANUS_MQTT_VERSION_5) == 0) {
#ifdef MQTTVERSION_5
ctx->connect.mqtt_version = MQTTVERSION_5;
#else
JANUS_LOG(LOG_FATAL, "Using MQTT v5 requires compilation with Paho >= 1.3.0\n");
goto error;
#endif
} else {
JANUS_LOG(LOG_FATAL, "Unknown MQTT version\n");
goto error;
}
janus_config_item *keep_alive_interval_item = janus_config_get(config, config_general, janus_config_type_item, "keep_alive_interval");
keep_alive_interval_item = janus_config_get(config, config_general, janus_config_type_item, "keep_alive_interval");
ctx->connect.keep_alive_interval = (keep_alive_interval_item && keep_alive_interval_item->value) ?
atoi(keep_alive_interval_item->value) : 20;
if(ctx->connect.keep_alive_interval < 0) {
JANUS_LOG(LOG_ERR, "Invalid keep-alive value: %s (falling back to default)\n", keep_alive_interval_item->value);
ctx->connect.keep_alive_interval = 20;
}
janus_config_item *cleansession_item = janus_config_get(config, config_general, janus_config_type_item, "cleansession");
ctx->connect.cleansession = (cleansession_item && cleansession_item->value) ?
atoi(cleansession_item->value) : 0;
if(ctx->connect.cleansession < 0) {
JANUS_LOG(LOG_ERR, "Invalid clean-session value: %s (falling back to default)\n", cleansession_item->value);
ctx->connect.cleansession = 0;
}
janus_config_item *enabled_item = janus_config_get(config, config_general, janus_config_type_item, "enabled");
if(enabled_item == NULL) {
/* Try legacy property */
enabled_item = janus_config_get(config, config_general, janus_config_type_item, "enable");
if (enabled_item && enabled_item->value) {
JANUS_LOG(LOG_WARN, "Found deprecated 'enable' property, please update it to 'enabled' instead\n");
}
}
if(enabled_item && enabled_item->value && janus_is_true(enabled_item->value)) {
janus_mqtt_api_enabled_ = TRUE;
/* Subscribe configuration */
{
janus_config_item *topic_item = janus_config_get(config, config_general, janus_config_type_item, "subscribe_topic");
if(!topic_item || !topic_item->value) {
JANUS_LOG(LOG_FATAL, "Missing topic for incoming messages for MQTT integration...\n");
goto error;
}
ctx->subscribe.topic = g_strdup(topic_item->value);
janus_config_item *qos_item = janus_config_get(config, config_general, janus_config_type_item, "subscribe_qos");
ctx->subscribe.qos = (qos_item && qos_item->value) ? atoi(qos_item->value) : 1;
if(ctx->subscribe.qos < 0) {
JANUS_LOG(LOG_ERR, "Invalid subscribe-qos value: %s (falling back to default)\n", qos_item->value);
ctx->subscribe.qos = 1;
}
}
/* Publish configuration */
{
janus_config_item *topic_item = janus_config_get(config, config_general, janus_config_type_item, "publish_topic");
if(!topic_item || !topic_item->value) {
JANUS_LOG(LOG_FATAL, "Missing topic for outgoing messages for MQTT integration...\n");
goto error;
}
ctx->publish.topic = g_strdup(topic_item->value);
janus_config_item *qos_item = janus_config_get(config, config_general, janus_config_type_item, "publish_qos");
ctx->publish.qos = (qos_item && qos_item->value) ? atoi(qos_item->value) : 1;
if(ctx->publish.qos < 0) {
JANUS_LOG(LOG_ERR, "Invalid publish-qos value: %s (falling back to default)\n", qos_item->value);
ctx->publish.qos = 1;
}
}
} else {
janus_mqtt_api_enabled_ = FALSE;
ctx->subscribe.topic = NULL;
ctx->publish.topic = NULL;
}
/* Disconnect configuration */
janus_config_item *disconnect_timeout_item = janus_config_get(config, config_general, janus_config_type_item, "disconnect_timeout");
ctx->disconnect.timeout = (disconnect_timeout_item && disconnect_timeout_item->value) ?
atoi(disconnect_timeout_item->value) : 100;
if(ctx->disconnect.timeout < 0) {
JANUS_LOG(LOG_ERR, "Invalid disconnect-timeout value: %s (falling back to default)\n", disconnect_timeout_item->value);
ctx->disconnect.timeout = 100;
}
/* Admin configuration */
janus_config_item *admin_enabled_item = janus_config_get(config, config_admin, janus_config_type_item, "admin_enabled");
if(admin_enabled_item == NULL) {
/* Try legacy property */
admin_enabled_item = janus_config_get(config, config_general, janus_config_type_item, "admin_enable");
if (admin_enabled_item && admin_enabled_item->value) {
JANUS_LOG(LOG_WARN, "Found deprecated 'admin_enable' property, please update it to 'admin_enabled' instead\n");
}
}
if(admin_enabled_item && admin_enabled_item->value && janus_is_true(admin_enabled_item->value)) {
janus_mqtt_admin_api_enabled_ = TRUE;
/* Admin subscribe configuration */
{
janus_config_item *topic_item = janus_config_get(config, config_admin, janus_config_type_item, "subscribe_topic");
if(!topic_item || !topic_item->value) {
JANUS_LOG(LOG_FATAL, "Missing topic for incoming admin messages for MQTT integration...\n");
goto error;
}
ctx->admin.subscribe.topic = g_strdup(topic_item->value);
janus_config_item *qos_item = janus_config_get(config, config_admin, janus_config_type_item, "subscribe_qos");
ctx->admin.subscribe.qos = (qos_item && qos_item->value) ? atoi(qos_item->value) : 1;
if(ctx->admin.subscribe.qos < 0) {
JANUS_LOG(LOG_ERR, "Invalid subscribe-qos value: %s (falling back to default)\n", qos_item->value);
ctx->admin.subscribe.qos = 1;
}
}
/* Admin publish configuration */
{
janus_config_item *topic_item = janus_config_get(config, config_admin, janus_config_type_item, "publish_topic");
if(!topic_item || !topic_item->value) {
JANUS_LOG(LOG_FATAL, "Missing topic for outgoing admin messages for MQTT integration...\n");
goto error;
}
ctx->admin.publish.topic = g_strdup(topic_item->value);
janus_config_item *qos_item = janus_config_get(config, config_admin, janus_config_type_item, "publish_qos");
ctx->admin.publish.qos = (qos_item && qos_item->value) ? atoi(qos_item->value) : 1;
if(ctx->admin.publish.qos < 0) {
JANUS_LOG(LOG_ERR, "Invalid publish-qos value: %s (falling back to default)\n", qos_item->value);
ctx->admin.publish.qos = 1;
}
}
} else {
janus_mqtt_admin_api_enabled_ = FALSE;
ctx->admin.subscribe.topic = NULL;
ctx->admin.publish.topic = NULL;
}
/* Status messages configuration */
janus_config_item *status_enabled_item = janus_config_get(config, config_status, janus_config_type_item, "enabled");
if(status_enabled_item && status_enabled_item->value && janus_is_true(status_enabled_item->value)) {
ctx->status.enabled = TRUE;
janus_config_item *status_connect_message_item = janus_config_get(config, config_status, janus_config_type_item, "connect_message");
if(status_connect_message_item && status_connect_message_item->value) {
ctx->status.connect_message = g_strdup(status_connect_message_item->value);
}
janus_config_item *status_disconnect_message_item = janus_config_get(config, config_status, janus_config_type_item, "disconnect_message");
if(status_disconnect_message_item && status_disconnect_message_item->value) {
ctx->status.disconnect_message = g_strdup(status_disconnect_message_item->value);
}
janus_config_item *status_topic_item = janus_config_get(config, config_status, janus_config_type_item, "topic");
if(status_topic_item && status_topic_item->value) {
ctx->status.topic = g_strdup(status_topic_item->value);
} else {
ctx->status.topic = g_strdup(JANUS_MQTT_DEFAULT_STATUS_TOPIC);
}
janus_config_item *status_qos_item = janus_config_get(config, config_status, janus_config_type_item, "qos");
if(status_qos_item && status_qos_item->value) {
ctx->status.qos = atoi(status_qos_item->value);
if(ctx->status.qos < 0) {
JANUS_LOG(LOG_ERR, "Invalid status-qos value: %s (disabling)\n", status_qos_item->value);
ctx->status.qos = 0;
}
}
janus_config_item *status_retain_item = janus_config_get(config, config_status, janus_config_type_item, "retain");
if(status_retain_item && status_retain_item->value && janus_is_true(status_retain_item->value)) {
ctx->status.retain = TRUE;
}
}
if(!janus_mqtt_api_enabled_ && !janus_mqtt_admin_api_enabled_) {
JANUS_LOG(LOG_WARN, "MQTT support disabled for both Janus and Admin API, giving up\n");
goto error;
}
/* Creating a client */
MQTTAsync_createOptions create_options = MQTTAsync_createOptions_initializer;
#ifdef MQTTVERSION_5
if (ctx->connect.mqtt_version == MQTTVERSION_5) {
create_options.MQTTVersion = MQTTVERSION_5;
}
#endif
if(MQTTAsync_createWithOptions(
&ctx->client,
url,
client_id,
MQTTCLIENT_PERSISTENCE_NONE,
NULL,
&create_options) != MQTTASYNC_SUCCESS) {
JANUS_LOG(LOG_FATAL, "Can't connect to MQTT broker: error creating client...\n");
goto error;
}
if(MQTTAsync_setConnected(ctx->client, ctx, janus_mqtt_client_connected) != MQTTASYNC_SUCCESS) {
JANUS_LOG(LOG_FATAL, "Can't connect to MQTT broker: error setting up connected callback...\n");
goto error;
}
if(MQTTAsync_setDisconnected(ctx->client, ctx, janus_mqtt_client_disconnected) != MQTTASYNC_SUCCESS) {
JANUS_LOG(LOG_FATAL, "Can't connect to MQTT broker: error setting up disconnected callback...\n");
goto error;
}
if(MQTTAsync_setConnectionLostCallback(ctx->client, ctx, janus_mqtt_client_connection_lost) != MQTTASYNC_SUCCESS) {
JANUS_LOG(LOG_FATAL, "Can't connect to MQTT broker: error setting up connection lost callback...\n");
goto error;
}
if(MQTTAsync_setMessageArrivedCallback(ctx->client, ctx, janus_mqtt_client_message_arrived) != MQTTASYNC_SUCCESS) {
JANUS_LOG(LOG_FATAL, "Can't connect to MQTT broker: error setting up message arrived callback...\n");
goto error;
}
/* Connecting to the broker */
int rc = janus_mqtt_client_connect(ctx);
if(rc != MQTTASYNC_SUCCESS) {
JANUS_LOG(LOG_FATAL, "Can't connect to MQTT broker, return code: %d\n", rc);
goto error;
}
g_free((char *)url);
g_free((char *)client_id);
janus_config_destroy(config);
return 0;
error:
/* If we got here, something went wrong */
janus_transport_session_destroy(mqtt_session);
janus_mqtt_client_destroy_context(&ctx);
g_free((char *)url);
g_free((char *)client_id);
janus_config_destroy(config);
return -1;
}
void janus_mqtt_destroy(void) {
JANUS_LOG(LOG_INFO, "Disconnecting MQTT client...\n");
janus_transport_session_destroy(mqtt_session);
janus_mqtt_client_disconnect(context_);
}
int janus_mqtt_get_api_compatibility(void) {
return JANUS_TRANSPORT_API_VERSION;
}
int janus_mqtt_get_version(void) {
return JANUS_MQTT_VERSION;
}
const char *janus_mqtt_get_version_string(void) {
return JANUS_MQTT_VERSION_STRING;
}
const char *janus_mqtt_get_description(void) {
return JANUS_MQTT_DESCRIPTION;
}
const char *janus_mqtt_get_name(void) {
return JANUS_MQTT_NAME;
}
const char *janus_mqtt_get_author(void) {
return JANUS_MQTT_AUTHOR;
}
const char *janus_mqtt_get_package(void) {
return JANUS_MQTT_PACKAGE;
}
gboolean janus_mqtt_is_janus_api_enabled(void) {
return janus_mqtt_api_enabled_;
}
gboolean janus_mqtt_is_admin_api_enabled(void) {
return janus_mqtt_admin_api_enabled_;
}
int janus_mqtt_send_message(janus_transport_session *transport, void *request_id, gboolean admin, json_t *message) {
if(message == NULL || transport == NULL) {
return -1;
}
/* Not really needed as we always only have a single context, but that's fine */
janus_mqtt_context *ctx = (janus_mqtt_context *)transport->transport_p;
if(ctx == NULL) {
json_decref(message);
return -1;
}
char *payload = json_dumps(message, json_format_);
json_decref(message);
JANUS_LOG(LOG_HUGE, "Sending %s API message via MQTT: %s\n", admin ? "admin" : "Janus", payload);
int rc = janus_mqtt_client_publish_message(ctx, payload, admin);
if(rc != MQTTASYNC_SUCCESS) {
JANUS_LOG(LOG_ERR, "Can't publish to MQTT topic: %s, return code: %d\n", admin ? ctx->admin.publish.topic : ctx->publish.topic, rc);
}
free(payload);
return 0;
}
void janus_mqtt_session_created(janus_transport_session *transport, guint64 session_id) {
/* We don't care */
}
void janus_mqtt_session_over(janus_transport_session *transport, guint64 session_id, gboolean timeout, gboolean claimed) {
/* We don't care, not even if it's a timeout (should we?), our client is always up */
}
void janus_mqtt_session_claimed(janus_transport_session *transport, guint64 session_id) {
/* We don't care about this. We should start receiving messages from the core about this session: no action necessary */
/* FIXME Is the above statement accurate? Should we care? Unlike the HTTP transport, there is no hashtable to update */
}
void janus_mqtt_client_connected(void *context, char *cause) {
JANUS_LOG(LOG_INFO, "Connected to MQTT broker: %s\n", cause);
janus_mqtt_context *ctx = (janus_mqtt_context *)context;
/* Subscribe to one (janus or admin) topic at the time */
if(janus_mqtt_api_enabled_) {
JANUS_LOG(LOG_INFO, "Subscribing to MQTT topic %s\n", ctx->subscribe.topic);
int rc = janus_mqtt_client_subscribe(context, FALSE);
if(rc != MQTTASYNC_SUCCESS) {
JANUS_LOG(LOG_ERR, "Can't subscribe to MQTT topic: %s, return code: %d\n", ctx->subscribe.topic, rc);
}
} else if(janus_mqtt_admin_api_enabled_) {
JANUS_LOG(LOG_INFO, "Subscribing to MQTT admin topic %s\n", ctx->admin.subscribe.topic);
int rc = janus_mqtt_client_subscribe(context, TRUE);
if(rc != MQTTASYNC_SUCCESS) {
JANUS_LOG(LOG_ERR, "Can't subscribe to MQTT admin topic: %s, return code: %d\n", ctx->admin.subscribe.topic, rc);
}
}
/* Notify handlers about this new transport */
if(notify_events && ctx->gateway && ctx->gateway->events_is_enabled()) {
json_t *info = json_object();
json_object_set_new(info, "event", json_string("connected"));
ctx->gateway->notify_event(&janus_mqtt_transport_, mqtt_session, info);
}
/* Send online status message */
if (ctx->status.enabled && ctx->status.connect_message != NULL) {
int rc = janus_mqtt_client_publish_status_message(ctx, ctx->status.connect_message);
if (rc != MQTTASYNC_SUCCESS) {
JANUS_LOG(LOG_ERR, "Failed to publish connect status MQTT message, topic: %s, message: %s, return code: %d\n", ctx->status.topic, ctx->status.connect_message, rc);
}
}
}
void janus_mqtt_client_disconnected(void *context, MQTTProperties *properties, enum MQTTReasonCodes reasonCode) {
const char *reasonCodeStr = MQTTReasonCode_toString(reasonCode);
JANUS_LOG(LOG_INFO, "Disconnected from MQTT broker: %s\n", reasonCodeStr);
/* Notify handlers about this transport being gone */
janus_mqtt_context *ctx = (janus_mqtt_context *)context;
if(notify_events && ctx && ctx->gateway && ctx->gateway->events_is_enabled()) {
json_t *info = json_object();
json_object_set_new(info, "event", json_string("disconnected"));
ctx->gateway->notify_event(&janus_mqtt_transport_, mqtt_session, info);
}
}
void janus_mqtt_client_connection_lost(void *context, char *cause) {
JANUS_LOG(LOG_INFO, "MQTT connection lost cause of %s. Reconnecting...\n", cause);
/* Automatic reconnect */
/* Notify handlers about this transport being gone */
janus_mqtt_context *ctx = (janus_mqtt_context *)context;
if(notify_events && ctx && ctx->gateway && ctx->gateway->events_is_enabled()) {
json_t *info = json_object();
json_object_set_new(info, "event", json_string("reconnecting"));
ctx->gateway->notify_event(&janus_mqtt_transport_, mqtt_session, info);
}
}
int janus_mqtt_client_message_arrived(void *context, char *topicName, int topicLen, MQTTAsync_message *message) {
janus_mqtt_context *ctx = (janus_mqtt_context *)context;
gchar *topic = g_strndup(topicName, topicLen);
const gboolean janus = janus_mqtt_api_enabled_ && !strcasecmp(topic, ctx->subscribe.topic);
const gboolean admin = janus_mqtt_admin_api_enabled_ && !strcasecmp(topic, ctx->admin.subscribe.topic);
g_free(topic);
if((janus || admin) && message->payloadlen) {
JANUS_LOG(LOG_HUGE, "Receiving %s API message over MQTT: %s\n", admin ? "admin" : "Janus", (char *)message->payload);
json_error_t error;
json_t *root = json_loadb(message->payload, message->payloadlen, 0, &error);
ctx->gateway->incoming_request(&janus_mqtt_transport_, mqtt_session, NULL, admin, root, &error);
}
MQTTAsync_freeMessage(&message);
MQTTAsync_free(topicName);
return TRUE;
}
int janus_mqtt_client_connect(janus_mqtt_context *ctx) {
MQTTAsync_connectOptions options = MQTTAsync_connectOptions_initializer;
#ifdef MQTTVERSION_5
if(ctx->connect.mqtt_version == MQTTVERSION_5) {
MQTTAsync_connectOptions options5 = MQTTAsync_connectOptions_initializer5;
options = options5;
options.cleanstart = ctx->connect.cleansession;
options.onFailure5 = janus_mqtt_client_connect_failure5;
} else {
options.cleansession = ctx->connect.cleansession;
options.onFailure = janus_mqtt_client_connect_failure;
}
#else
options.cleansession = ctx->connect.cleansession;
options.onSuccess = janus_mqtt_client_connect_success;
options.onFailure = janus_mqtt_client_connect_failure;
#endif
options.MQTTVersion = ctx->connect.mqtt_version;
options.username = ctx->connect.username;
options.password = ctx->connect.password;
options.automaticReconnect = TRUE;
options.keepAliveInterval = ctx->connect.keep_alive_interval;
MQTTAsync_SSLOptions ssl_opts = MQTTAsync_SSLOptions_initializer;
if(ctx->ssl_enabled) {
ssl_opts.trustStore = ctx->cacert_file;
ssl_opts.keyStore = ctx->cert_file;
ssl_opts.privateKey = ctx->key_file;
ssl_opts.enableServerCertAuth = ctx->verify_peer;
options.ssl = &ssl_opts;
}
MQTTAsync_willOptions willOptions = MQTTAsync_willOptions_initializer;
if(ctx->status.enabled && ctx->status.disconnect_message != NULL) {
willOptions.topicName = ctx->status.topic;
willOptions.message = ctx->status.disconnect_message;
willOptions.retained = ctx->status.retain;
willOptions.qos = ctx->status.qos;
options.will = &willOptions;
}
options.context = ctx;
return MQTTAsync_connect(ctx->client, &options);
}
void janus_mqtt_client_connect_failure(void *context, MQTTAsync_failureData *response) {
int rc = janus_mqtt_client_get_response_code(response);
janus_mqtt_client_connect_failure_impl(context, rc);
}
#ifdef MQTTVERSION_5
void janus_mqtt_client_connect_failure5(void *context, MQTTAsync_failureData5 *response) {
int rc = janus_mqtt_client_get_response_code5(response);
janus_mqtt_client_connect_failure_impl(context, rc);
}
#endif
void janus_mqtt_client_connect_failure_impl(void *context, int rc) {
JANUS_LOG(LOG_ERR, "MQTT client has failed connecting to the broker, return code: %d. Reconnecting...\n", rc);
/* Automatic reconnect */
/* Notify handlers about this transport failure */
janus_mqtt_context *ctx = (janus_mqtt_context *)context;
if(notify_events && ctx && ctx->gateway && ctx->gateway->events_is_enabled()) {
json_t *info = json_object();
json_object_set_new(info, "event", json_string("failed"));
json_object_set_new(info, "code", json_integer(rc));
ctx->gateway->notify_event(&janus_mqtt_transport_, mqtt_session, info);
}
}
int janus_mqtt_client_reconnect(janus_mqtt_context *ctx) {
MQTTAsync_disconnectOptions options = MQTTAsync_disconnectOptions_initializer;
#ifdef MQTTVERSION_5
if(ctx->connect.mqtt_version == MQTTVERSION_5) {
options.onSuccess5 = janus_mqtt_client_reconnect_success5;
options.onFailure5 = janus_mqtt_client_reconnect_failure5;
} else {
options.onSuccess = janus_mqtt_client_reconnect_success;
options.onFailure = janus_mqtt_client_reconnect_failure;
}
#else
options.onSuccess = janus_mqtt_client_reconnect_success;
options.onFailure = janus_mqtt_client_reconnect_failure;
#endif
options.context = ctx;
options.timeout = ctx->disconnect.timeout;
return MQTTAsync_disconnect(ctx->client, &options);
}
void janus_mqtt_client_reconnect_success(void *context, MQTTAsync_successData *response) {
janus_mqtt_client_reconnect_success_impl(context);
}
#ifdef MQTTVERSION_5
void janus_mqtt_client_reconnect_success5(void *context, MQTTAsync_successData5 *response) {
janus_mqtt_client_reconnect_success_impl(context);
}
#endif
void janus_mqtt_client_reconnect_success_impl(void *context) {
JANUS_LOG(LOG_INFO, "MQTT client has been successfully disconnected. Reconnecting...\n");
int rc = janus_mqtt_client_connect(context);
if(rc != MQTTASYNC_SUCCESS) {
JANUS_LOG(LOG_FATAL, "Can't connect to MQTT broker, return code: %d\n", rc);
}
}
void janus_mqtt_client_reconnect_failure(void *context, MQTTAsync_failureData *response) {
int rc = janus_mqtt_client_get_response_code(response);
janus_mqtt_client_reconnect_failure_impl(context, rc);
}
#ifdef MQTTVERSION_5
void janus_mqtt_client_reconnect_failure5(void *context, MQTTAsync_failureData5 *response) {
int rc = janus_mqtt_client_get_response_code5(response);
janus_mqtt_client_reconnect_failure_impl(context, rc);
}
#endif
void janus_mqtt_client_reconnect_failure_impl(void *context, int rc) {
JANUS_LOG(LOG_ERR, "MQTT client has failed reconnecting from MQTT broker, return code: %d\n", rc);
}
int janus_mqtt_client_disconnect(janus_mqtt_context *ctx) {
if (ctx->status.enabled && ctx->status.disconnect_message != NULL) {
int rc = janus_mqtt_client_publish_status_message(ctx, ctx->status.disconnect_message);
if (rc != MQTTASYNC_SUCCESS) {
JANUS_LOG(LOG_ERR, "Failed to publish disconnect status MQTT message, topic: %s, message: %s, return code: %d\n", ctx->status.topic, ctx->status.disconnect_message, rc);
}
}
MQTTAsync_disconnectOptions options = MQTTAsync_disconnectOptions_initializer;
#ifdef MQTTVERSION_5
if(ctx->connect.mqtt_version == MQTTVERSION_5) {
options.onSuccess5 = janus_mqtt_client_disconnect_success5;
options.onFailure5 = janus_mqtt_client_disconnect_failure5;
} else {
options.onSuccess = janus_mqtt_client_disconnect_success;
options.onFailure = janus_mqtt_client_disconnect_failure;
}
#else
options.onSuccess = janus_mqtt_client_disconnect_success;
options.onFailure = janus_mqtt_client_disconnect_failure;
#endif
options.context = ctx;
options.timeout = ctx->disconnect.timeout;
return MQTTAsync_disconnect(ctx->client, &options);
}
void janus_mqtt_client_disconnect_success(void *context, MQTTAsync_successData *response) {
janus_mqtt_client_disconnect_success_impl(context);
}
#ifdef MQTTVERSION_5
void janus_mqtt_client_disconnect_success5(void *context, MQTTAsync_successData5 *response) {
janus_mqtt_client_disconnect_success_impl(context);
}
#endif
void janus_mqtt_client_disconnect_success_impl(void *context) {
JANUS_LOG(LOG_INFO, "MQTT client has been successfully disconnected.\n");
janus_mqtt_context *ctx = (janus_mqtt_context *)context;
janus_mqtt_client_destroy_context(&ctx);
}
void janus_mqtt_client_disconnect_failure(void *context, MQTTAsync_failureData *response) {
int rc = janus_mqtt_client_get_response_code(response);
janus_mqtt_client_disconnect_failure_impl(context, rc);
}
#ifdef MQTTVERSION_5
void janus_mqtt_client_disconnect_failure5(void *context, MQTTAsync_failureData5 *response) {
int rc = janus_mqtt_client_get_response_code5(response);
janus_mqtt_client_disconnect_failure_impl(context, rc);
}
#endif
void janus_mqtt_client_disconnect_failure_impl(void *context, int rc) {
JANUS_LOG(LOG_ERR, "Can't disconnect from MQTT broker, return code: %d\n", rc);
janus_mqtt_context *ctx = (janus_mqtt_context *)context;
janus_mqtt_client_destroy_context(&ctx);
}
int janus_mqtt_client_subscribe(janus_mqtt_context *ctx, gboolean admin) {
MQTTAsync_responseOptions options = MQTTAsync_responseOptions_initializer;
options.context = ctx;
if(admin) {
#ifdef MQTTVERSION_5
if(ctx->connect.mqtt_version == MQTTVERSION_5) {
options.onSuccess5 = janus_mqtt_client_admin_subscribe_success5;
options.onFailure5 = janus_mqtt_client_admin_subscribe_failure5;
} else {
options.onSuccess = janus_mqtt_client_admin_subscribe_success;
options.onFailure = janus_mqtt_client_admin_subscribe_failure;
}
#else
options.onSuccess = janus_mqtt_client_admin_subscribe_success;
options.onFailure = janus_mqtt_client_admin_subscribe_failure;
#endif
return MQTTAsync_subscribe(ctx->client, ctx->admin.subscribe.topic, ctx->admin.subscribe.qos, &options);
} else {
#ifdef MQTTVERSION_5
if(ctx->connect.mqtt_version == MQTTVERSION_5) {
options.onSuccess5 = janus_mqtt_client_subscribe_success5;
options.onFailure5 = janus_mqtt_client_subscribe_failure5;
} else {
options.onSuccess = janus_mqtt_client_subscribe_success;
options.onFailure = janus_mqtt_client_subscribe_failure;
}
#else
options.onSuccess = janus_mqtt_client_subscribe_success;
options.onFailure = janus_mqtt_client_subscribe_failure;
#endif
return MQTTAsync_subscribe(ctx->client, ctx->subscribe.topic, ctx->subscribe.qos, &options);
}
}
void janus_mqtt_client_subscribe_success(void *context, MQTTAsync_successData *response) {
janus_mqtt_client_subscribe_success_impl(context);
}
#ifdef MQTTVERSION_5
void janus_mqtt_client_subscribe_success5(void *context, MQTTAsync_successData5 *response) {
janus_mqtt_client_subscribe_success_impl(context);
}
#endif
void janus_mqtt_client_subscribe_success_impl(void *context) {
janus_mqtt_context *ctx = (janus_mqtt_context *)context;