void ei_encode_switch_event_tag(ei_x_buff * ebuf, switch_event_t *event, char *tag)
{
ei_x_encode_tuple_header(ebuf, 2);
ei_x_encode_atom(ebuf, tag);
ei_encode_switch_event_headers(ebuf, event);
}
static switch_xml_t fetch_handler(const char *section, const char *tag_name, const char *key_name, const char *key_value, switch_event_t *params, void *user_data) {
switch_xml_t xml = NULL;
switch_uuid_t uuid;
switch_time_t now = 0;
ei_xml_agent_t *agent = (ei_xml_agent_t *) user_data;
ei_xml_client_t *client;
fetch_handler_t *fetch_handler;
xml_fetch_reply_t reply, *pending, *prev = NULL;
now = switch_micro_time_now();
if (!switch_test_flag(&globals, LFLAG_RUNNING)) {
return xml;
}
/* read-lock the agent */
switch_thread_rwlock_rdlock(agent->lock);
/* serialize access to current, used to round-robin requests */
/* TODO: check globals for round-robin boolean or loop all clients */
switch_mutex_lock(agent->current_client_mutex);
if (!agent->current_client) {
client = agent->clients;
} else {
client = agent->current_client;
}
if (client) {
agent->current_client = client->next;
}
switch_mutex_unlock(agent->current_client_mutex);
/* no client, no work required */
if (!client || !client->fetch_handlers) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "No %s XML erlang handler currently available\n"
,section);
switch_thread_rwlock_unlock(agent->lock);
return xml;
}
/* prepare the reply collector */
switch_uuid_get(&uuid);
switch_uuid_format(reply.uuid_str, &uuid);
reply.next = NULL;
reply.xml_str = NULL;
/* add our reply placeholder to the replies list */
switch_mutex_lock(agent->replies_mutex);
if (!agent->replies) {
agent->replies = &reply;
} else {
reply.next = agent->replies;
agent->replies = &reply;
}
switch_mutex_unlock(agent->replies_mutex);
fetch_handler = client->fetch_handlers;
while (fetch_handler != NULL) {
ei_send_msg_t *send_msg;
switch_malloc(send_msg, sizeof(*send_msg));
memcpy(&send_msg->pid, &fetch_handler->pid, sizeof(erlang_pid));
ei_x_new_with_version(&send_msg->buf);
ei_x_encode_tuple_header(&send_msg->buf, 7);
ei_x_encode_atom(&send_msg->buf, "fetch");
ei_x_encode_atom(&send_msg->buf, section);
_ei_x_encode_string(&send_msg->buf, tag_name ? tag_name : "undefined");
_ei_x_encode_string(&send_msg->buf, key_name ? key_name : "undefined");
_ei_x_encode_string(&send_msg->buf, key_value ? key_value : "undefined");
_ei_x_encode_string(&send_msg->buf, reply.uuid_str);
if (params) {
ei_encode_switch_event_headers(&send_msg->buf, params);
} else {
ei_x_encode_empty_list(&send_msg->buf);
}
if (switch_queue_trypush(client->ei_node->send_msgs, send_msg) != SWITCH_STATUS_SUCCESS) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Failed to send %s XML request to %s <%d.%d.%d>\n"
,section
,fetch_handler->pid.node
,fetch_handler->pid.creation
,fetch_handler->pid.num
,fetch_handler->pid.serial);
ei_x_free(&send_msg->buf);
switch_safe_free(send_msg);
} else {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Sending %s XML request (%s) to %s <%d.%d.%d>\n"
,section
,reply.uuid_str
,fetch_handler->pid.node
,fetch_handler->pid.creation
,fetch_handler->pid.num
,fetch_handler->pid.serial);
}
fetch_handler = fetch_handler->next;
}
/* wait for a reply (if there isnt already one...amazingly improbable but lets not take shortcuts */
switch_mutex_lock(agent->replies_mutex);
switch_thread_rwlock_unlock(agent->lock);
if (!reply.xml_str) {
switch_time_t timeout;
timeout = switch_micro_time_now() + 3000000;
while (switch_micro_time_now() < timeout) {
/* unlock the replies list and go to sleep, calculate a three second timeout before we started the loop
* plus 100ms to add a little hysteresis between the timeout and the while loop */
switch_thread_cond_timedwait(agent->new_reply, agent->replies_mutex, (timeout - switch_micro_time_now() + 100000));
/* if we woke up (and therefore have locked replies again) check if we got our reply
* otherwise we either timed-out (the while condition will fail) or one of
* our sibling processes got a reply and we should go back to sleep */
if (reply.xml_str) {
break;
}
}
}
/* find our reply placeholder in the linked list and remove it */
pending = agent->replies;
while (pending != NULL) {
if (pending->uuid_str == reply.uuid_str) {
break;
}
prev = pending;
pending = pending->next;
}
if (pending) {
if (!prev) {
agent->replies = reply.next;
} else {
prev->next = reply.next;
}
}
/* we are done with the replies link-list */
switch_mutex_unlock(agent->replies_mutex);
/* after all that did we get what we were after?! */
if (reply.xml_str) {
/* HELL YA WE DID */
reply.xml_str = expand_vars(reply.xml_str);
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Received %s XML (%s) after %dms: %s\n"
,section
,reply.uuid_str
,(unsigned int) (switch_micro_time_now() - now) / 1000
,reply.xml_str);
xml = switch_xml_parse_str_dynamic(reply.xml_str, SWITCH_FALSE);
} else {
/* facepalm */
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "Request for %s XML (%s) timed-out after %dms\n"
,section
,reply.uuid_str
,(unsigned int) (switch_micro_time_now() - now) / 1000);
}
return xml;
}
void ei_encode_switch_event(ei_x_buff *ebuf, switch_event_t *event) {
ei_x_encode_tuple_header(ebuf, 2);
ei_x_encode_atom(ebuf, "event");
ei_encode_switch_event_headers(ebuf, event);
}
