libsoundmanager.cpp

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/*
 * Copyright (c) 2017 TOYOTA MOTOR CORPORATION
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <stdarg.h>
#include <sys/socket.h>
#include <iostream>
#include <algorithm>
#include <thread>
#include <errno.h>
#include <libsoundmanager/libsoundmanager.hpp>

#define ELOG(args,...) _ELOG(__FUNCTION__,__LINE__,args,##__VA_ARGS__)
#define DLOG(args,...) _DLOG(__FUNCTION__,__LINE__,args,##__VA_ARGS__)

using namespace std;

static void _DLOG(const char* func, const int line, const char* log, ...);
static void _ELOG(const char* func, const int line, const char* log, ...);
static bool has_verb(const string& verb);
static const char API[] = "soundmanager";

static void _on_hangup_static(void *closure, struct afb_wsj1 *wsj)
{
    static_cast<LibSoundmanager*>(closure)->on_hangup(NULL,wsj);
}

static void _on_call_static(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg)
{
    /* LibSoundmanager is not called from other process */
}

static void _on_event_static(void* closure, const char* event, struct afb_wsj1_msg *msg)
{
    static_cast<LibSoundmanager*>(closure)->on_event(NULL,event,msg);
}

static void _on_reply_static(void *closure, struct afb_wsj1_msg *msg)
{
    static_cast<LibSoundmanager*>(closure)->on_reply(NULL,msg);     
}


LibSoundmanager::LibSoundmanager(const int port, const string& token)
{
    int ret;
    if(port > 0 && token.size() > 0)
    {
        mport = port;
        mtoken = token;
    }
    else
    {
        ELOG("port and token should be > 0, Initial port and token uses.");
    }

    ret = initialize_websocket();
    if(ret != 0 )
    {
        ELOG("Failed to initialize websocket");
    }
    else{
        DLOG("Initialized");
    }
}

LibSoundmanager::~LibSoundmanager()
{
    if(mploop)
    {
        sd_event_unref(mploop);
    }
    if(sp_websock != NULL)
    {
        free(sp_websock);
    }
}

void LibSoundmanager::register_callback(
    void (*event_cb)(const std::string& event, struct json_object* event_contents), 
    void (*reply_cb)(struct json_object* reply_contents))
{
    onEvent = event_cb;
    onReply = reply_cb;
}

int LibSoundmanager::initialize_websocket()
{
    mploop = NULL;
    onEvent = nullptr;
    onReply = nullptr;
    int ret = sd_event_default(&mploop);
    if(ret < 0)
    {
        ELOG("Failed to create event loop");
        goto END;
    }
    /* Initialize interface from websocket */
    
    minterface.on_hangup = _on_hangup_static;
    minterface.on_call = _on_call_static; /* Is this necessary? */
    minterface.on_event = _on_event_static;
    muri += "ws://localhost:" + to_string(mport) + "/api?token=" + mtoken; /*To be modified*/
    sp_websock = afb_ws_client_connect_wsj1(mploop, muri.c_str(), &minterface, this);
    if(sp_websock == NULL)
    {
        ELOG("Failed to create websocket connection");
        goto END;
    }

    /* creates the evsrc */
    //ret = sd_event_add_io(mploop,&mevent_src, sp_websock->fd, EPOLLIN, event_callback, NULL);
    
    return 0;
END:
    if(mploop)
    {
        sd_event_unref(mploop);
    }
    return -1;
}

static void *event_loop_run(void *args)
{
    struct sd_event* loop = (struct sd_event*)(args);
    DLOG("start eventloop");
    for(;;)
        sd_event_run(loop, 30000000);
}

int LibSoundmanager::run_eventloop()
{
    if(mploop && sp_websock)
    {
        pthread_t thread_id;
        int ret = pthread_create(&thread_id, NULL, event_loop_run, mploop);
        if(ret != 0)
        {
            ELOG("Cannot run eventloop due to error:%d", errno);
            return -1;
        }
        else
            return thread_id;
    }
    else
    {
        ELOG("Connecting is not established yet");
        return -1;
    }
}

int LibSoundmanager::call(const string& verb, struct json_object* arg)
{
    int ret;
    if(!sp_websock)
    {
        return -1;
    }
    if (!has_verb(verb))
    {
        ELOG("verb doesn't exit");
        return -1;
    }
    ret = afb_wsj1_call_j(sp_websock, API, verb.c_str(), arg, _on_reply_static, this);
    if (ret < 0) {
        ELOG("Failed to call verb:%s",verb.c_str());
    }
    return ret;
}

int LibSoundmanager::call_sync(const string& verb, struct json_object* arg, struct json_object* ret)
{
    /* I haven't implemented yet */
}

int LibSoundmanager::subscribe(const string& event_name)
{
    if(!sp_websock)
    {
        return -1;
    }
    struct json_object* j_obj = json_object_new_object();
    json_object_object_add(j_obj, "event", json_object_new_string(event_name.c_str()));

    int ret = afb_wsj1_call_j(sp_websock, API, "subscribe", j_obj, _on_reply_static, this);
    if (ret < 0) {
        ELOG("Failed to call verb:%s",__FUNCTION__);
    }
    return ret;
}

int LibSoundmanager::unsubscribe(const string& event_name)
{
    if(!sp_websock)
    {
        return -1;
    }
    struct json_object* j_obj = json_object_new_object();
    json_object_object_add(j_obj, "event", json_object_new_string(event_name.c_str()));

    int ret = afb_wsj1_call_j(sp_websock, API, "unsubscribe", j_obj, _on_reply_static, this);
    if (ret < 0) {
        ELOG("Failed to call verb:%s",__FUNCTION__);
    }
    return ret;
}

am_Error_e LibSoundmanager::connect(const am_sourceID_t sourceID, const am_sinkID_t sinkID, am_mainConnectionID_t& mainConnectionID)
{
    /*int ret;
    char *key;
    rc = asprintf(&key, "%d:%s/%s", ++num, api, "connect"); 
    ret = afb_wsj1_call_s(wsj1, api, verb, object, on_reply, key);
    if(ret < 0)
    {
        fprintf(stderr, "calling %s/%s(%s) failed: %m\n", api, verb, object);
        
    }*/
    /* open the json scripts */
    // get mainconnedction ID */
    //mainConnectionID = xx; 
    return E_OK;    
}

am_Error_e LibSoundmanager::disconnect(const am_mainConnectionID_t mainConnectionID)
{
    return E_OK;
}

/*const struct afb_wsj1* LibSoundmanager::get_websocket_handler()
{
    if(sp_websock)
    {
        return sp_websock;
    }
    return nullptr;
}

const struct sd_event* LibSoundmanager::get_sd_event()
{
    if(mploop)
    {
        return mploop;
    }
    return nullptr;
}*/

/************* Callback Function *************/

void LibSoundmanager::on_hangup(void *closure, struct afb_wsj1 *wsj)
{
    DLOG("%s called", __FUNCTION__);
}

void LibSoundmanager::on_call(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg)
{
}

/*
* event is like "soundmanager/newMainConnection"
* msg is like {"event":"soundmanager\/newMainConnection","data":{"mainConnectionID":3,"sourceID":101,"sinkID":100,"delay":0,"connectionState":4},"jtype":"afb-event"})}
*               ^key^   ^^^^^^^^^^^^ value ^^^^^^^^^^^^
* so you can get 
    event name : struct json_object obj = json_object_object_get(msg,"event")
*/ 
void LibSoundmanager::on_event(void *closure, const char *event, struct afb_wsj1_msg *msg)
{
    cout << "ON-EVENT:" << event << "(" << afb_wsj1_msg_object_s(msg) << ")" << endl;   
    if(onEvent != nullptr)
    {
        const string ev(event);
        struct json_object* ev_contents = afb_wsj1_msg_object_j(msg);
        onEvent(ev, ev_contents);
    }
}

void LibSoundmanager::on_reply(void *closure, struct afb_wsj1_msg *msg)
{
    cout << "ON-REPLY:" <<  "(" << afb_wsj1_msg_object_s(msg) << ")" << endl;
    if(onReply != nullptr)
    {
        struct json_object* reply = afb_wsj1_msg_object_j(msg);
        onReply(reply);
    }
}

/* Internal Function in libsoundmanager */

static void _ELOG(const char* func, const int line, const char* log, ...)
{
    char *message;
    va_list args;
    va_start(args, log);
    if (log == NULL || vasprintf(&message, log, args) < 0)
        message = NULL;
    cout << "[ERROR]" << func << "(" << line << "):" << message << endl; 
    va_end(args);
    free(message);
}

static void _DLOG(const char* func, const int line, const char* log, ...)
{
    char *message;
    va_list args;
    va_start(args, log);
    if (log == NULL || vasprintf(&message, log, args) < 0)
        message = NULL;
    cout << "[DEBUG]" << func << "(" << line << "):" << message << endl; 
    va_end(args);
    free(message);
}

static bool has_verb(const string& verb)
{
    DLOG("verb is %s", verb.c_str());
    if(find(api_list.begin(), api_list.end(), verb) != api_list.end())
        return true;
    else
        return false;
}