272bac70dd
Add framework to connect to, and read and write protocol based messages from and to an external application using an Asterisk External Application Protocol (AEAP). This has been divided into several abstractions: 1. transport - base communication layer (currently websocket only) 2. message - AEAP description and data (currently JSON only) 3. transaction - links/binds requests and responses 4. aeap - transport, message, and transaction handler/manager This patch also adds an AEAP implementation for speech to text. Existing speech API callbacks for speech to text have been completed making it possible for Asterisk to connect to a configured external translator service and provide audio for STT. Results can also be received from the external translator, and made available as speech results in Asterisk. Unit tests have also been created that test the AEAP framework, and also the speech to text implementation. ASTERISK-29726 #close Change-Id: Iaa4b259f84aa63501e5fd2a6fb107f900b4d4ed2
157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2021, Sangoma Technologies Corporation
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*
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* Kevin Harwell <kharwell@sangoma.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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#include "asterisk.h"
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#include "asterisk/utils.h"
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#include "logger.h"
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#include "transport.h"
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#include "transport_websocket.h"
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struct aeap_transport *aeap_transport_create(const char *type)
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{
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struct aeap_transport *transport = NULL;
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if (!strncasecmp(type, "ws", 2)) {
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transport = (struct aeap_transport *)aeap_transport_websocket_create();
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}
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if (!transport) {
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ast_log(LOG_ERROR, "AEAP transport: failed to create for type '%s'\n", type);
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return NULL;
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}
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ast_mutex_init(&transport->read_lock);
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ast_mutex_init(&transport->write_lock);
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transport->connected = 0;
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return transport;
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}
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int aeap_transport_connect(struct aeap_transport *transport, const char *url,
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const char *protocol, int timeout)
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{
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int res;
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SCOPED_MUTEX(rlock, &transport->read_lock);
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SCOPED_MUTEX(wlock, &transport->write_lock);
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if (aeap_transport_is_connected(transport)) {
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return 0;
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}
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res = transport->vtable->connect(transport, url, protocol, timeout);
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if (!res) {
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transport->connected = 1;
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}
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return res;
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}
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struct aeap_transport *aeap_transport_create_and_connect(const char *type,
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const char *url, const char *protocol, int timeout)
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{
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struct aeap_transport *transport = aeap_transport_create(type);
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if (!transport) {
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return NULL;
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}
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if (aeap_transport_connect(transport, url, protocol, timeout)) {
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aeap_transport_destroy(transport);
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return NULL;
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}
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return transport;
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}
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int aeap_transport_is_connected(struct aeap_transport *transport)
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{
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/*
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* Avoid using a lock to 'read' the 'connected' variable in order to
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* keep things slightly more efficient.
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*/
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return ast_atomic_fetch_add(&transport->connected, 0, __ATOMIC_RELAXED);
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}
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int aeap_transport_disconnect(struct aeap_transport *transport)
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{
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int res;
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SCOPED_MUTEX(rlock, &transport->read_lock);
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SCOPED_MUTEX(wlock, &transport->write_lock);
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if (!aeap_transport_is_connected(transport)) {
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return 0;
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}
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res = transport->vtable->disconnect(transport);
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/*
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* Even though the transport is locked here use atomics to set the value of
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* 'connected' since it's possible the variable is being 'read' by another
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* thread via the 'is_connected' call.
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*/
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ast_atomic_fetch_sub(&transport->connected, 1, __ATOMIC_RELAXED);
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return res;
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}
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void aeap_transport_destroy(struct aeap_transport *transport)
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{
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if (!transport) {
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return;
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}
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/* Ensure an orderly disconnect occurs before final destruction */
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aeap_transport_disconnect(transport);
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transport->vtable->destroy(transport);
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ast_mutex_destroy(&transport->read_lock);
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ast_mutex_destroy(&transport->write_lock);
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ast_free(transport);
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}
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intmax_t aeap_transport_read(struct aeap_transport *transport, void *buf, intmax_t size,
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enum AST_AEAP_DATA_TYPE *rtype)
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{
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SCOPED_MUTEX(lock, &transport->read_lock);
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if (!aeap_transport_is_connected(transport)) {
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return 0;
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}
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return transport->vtable->read(transport, buf, size, rtype);
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}
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intmax_t aeap_transport_write(struct aeap_transport *transport, const void *buf, intmax_t size,
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enum AST_AEAP_DATA_TYPE wtype)
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{
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SCOPED_MUTEX(lock, &transport->write_lock);
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if (!aeap_transport_is_connected(transport)) {
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return 0;
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}
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return transport->vtable->write(transport, buf, size, wtype);
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}
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