source: source/ariba/utility/transport/rfcomm/rfcomm.cpp @ 5289

#include "rfcomm.hpp"

#include "../asio/asio_io_service.h"
#include "../asio/rfcomm.hpp"
#include "../asio/bluetooth_endpoint.hpp"

#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <boost/array.hpp>
#include <memory.h>
#include <deque>


namespace ariba {
namespace transport {

using namespace boost::asio;
using namespace detail;
using namespace std;

using boost::system::error_code;

class link_data {
public:
        uint8_t size_[4];
        size_t size;
        uint8_t* buffer;
};

class link_info {
public:
        link_info(io_service& io ) :
                up(false), local(), remote(), socket(io), size(0), buffer(NULL), sending(false) {
        }

        // state
        bool up;
        rfcomm_endpoint local, remote;
        bluetooth::rfcomm::socket socket;

        // read buffer
        uint8_t size_[4];
        size_t size;
        uint8_t* buffer;

        // send buffer
        bool sending;
        boost::mutex mutex;
        std::deque<link_data> send_buffer;
};

void rfcomm::remove_info(link_info* info) {
        for (vector<link_info*>::iterator i = links.begin(); i!=links.end();i++)
                if (*i==info) {
                        delete info;
                        links.erase(i);
                }
}


inline bluetooth::rfcomm::endpoint convert( const rfcomm_endpoint& endpoint ) {
        return bluetooth::rfcomm::endpoint(
                endpoint.mac().bluetooth(), endpoint.channel().value()
        );
}

inline rfcomm_endpoint convert( const bluetooth::rfcomm::endpoint& endpoint ) {
        mac_address mac;
        mac.bluetooth( endpoint.address() );
        rfcomm_channel_address channel;
        channel.value( endpoint.channel() );
        return rfcomm_endpoint( mac, channel );
}


rfcomm::rfcomm(uint16_t channel) :
        channel(channel), io(asio_io_service::alloc()) {
}

rfcomm::~rfcomm() {
        asio_io_service::free();
}

void rfcomm::start() {

        // start io service
        asio_io_service::start();

        // create acceptor
        cout << "Binding to channel " << channel << endl;
        acceptor = new bluetooth::rfcomm::acceptor(io,
                bluetooth::rfcomm::endpoint(bluetooth::rfcomm::get(), channel )
        );

        // start accepting
        start_accept();
}

void rfcomm::stop() {

}

void rfcomm::send(const address_v* remote, const uint8_t* data, size_t size) {
        // get end-point
        rfcomm_endpoint endpoint = *remote;
        endpoint = convert(convert(endpoint));

        // try to find established connector
        link_info* info = NULL;
        for (size_t i = 0; i < links.size(); i++)
                if (links[i]->remote.mac() == endpoint.mac()) {
                        info = links[i];
                        break;
                }

        // not found? ->try to connect
        if (info==NULL) {
                cout << "Connecting to " << endpoint.to_string() << endl;
                info = new link_info(io);
                info->socket.async_connect( convert(endpoint), boost::bind(
                        &rfcomm::handle_connect, this,
                        boost::asio::placeholders::error, info
                ));
                asio_io_service::start();
        }

        // copy message
        link_data ldata;
        ldata.size = size;
        ldata.size_[0] = (size >> 24) & 0xFF;
        ldata.size_[1] = (size >> 16) & 0xFF;
        ldata.size_[2] = (size >> 8) & 0xFF;
        ldata.size_[3] = (size >> 0) & 0xFF;
        ldata.buffer = new uint8_t[size];
        memcpy(ldata.buffer, data, size);

        // enqueue message
        info->mutex.lock();
        info->send_buffer.push_back(ldata);
        info->mutex.unlock();

        // start writing
        start_write(info);
}

void rfcomm::send(const endpoint_set& endpoints, const uint8_t* data, size_t size) {
        // send a message to each combination of mac-address and channel
        BOOST_FOREACH( const mac_address mac, endpoints.bluetooth ) {
                BOOST_FOREACH( const rfcomm_channel_address channel, endpoints.rfcomm ) {
                        rfcomm_endpoint endpoint(mac, channel);
                        address_vf vf = endpoint;
                        send(vf,data,size);
                }
        }
}

void rfcomm::terminate(const address_v* local, const address_v* remote) {
        // not supported right now!
}

void rfcomm::register_listener(transport_listener* listener) {
        this->listener = listener;
}

void rfcomm::start_accept() {

        cout << "Waiting for connections ..." << endl;

        // start accepting a connection
        link_info* info = new link_info(io);
        acceptor->async_accept(info->socket, boost::bind(
                // bind parameters
                &rfcomm::handle_accept, this,

                // handler parameters
                boost::asio::placeholders::error, info
        ));
        asio_io_service::start();
}

void rfcomm::handle_accept(const error_code& error, link_info* info) {
        if (error) {
                cout << "Error accepting" << endl;
                delete info;
                return;
        }

        // convert endpoints
        info->up = true;
        info->local  = convert( info->socket.local_endpoint()  );
        info->remote = convert( info->socket.remote_endpoint() );

        cout << "Accepting incoming connection from " << info->remote.to_string() << endl;

        // add to list
        links_mutex.lock();
        links.push_back(info);
        links_mutex.unlock();

        // start i/o
        start_read(info);
        start_write(info);

        // restart accept
        start_accept();
}

void rfcomm::handle_connect( const error_code& error, link_info* info ) {
        if (error) {
                cout << "Error connecting ..." << endl;
                delete info;
                return;
        }

        // convert endpoints
        info->up = true;
        info->local  = convert( info->socket.local_endpoint()  );
        info->remote = convert( info->socket.remote_endpoint() );

        cout << "Connected to " << info->remote.to_string() << endl;

        // add to list
        links_mutex.lock();
        links.push_back(info);
        links_mutex.unlock();

        // start i/o
        start_read(info);
        start_write(info);
}

void rfcomm::start_read(link_info* info) {
        // start read
        boost::asio::async_read(info->socket,
                // read size of packet
                boost::asio::buffer(info->size_, 4),
                // bind handler
                boost::bind(
                        // bind parameters
                        &rfcomm::handle_read_header, this,
                        // handler parameters
                        placeholders::error, placeholders::bytes_transferred, info
                )
        );
}

void rfcomm::handle_read_header(const error_code& error, size_t bytes,
        link_info* info) {

        // ignore errors and wait for all data to be received
        if (error || bytes != 4) return;

        // get size
        info->size = (info->size_[0]<<24) + (info->size_[1] << 16) +
                        (info->size_[2]<< 8) + (info->size_[3] << 0);

        cout << "receive message of size " << info->size << endl;

        // allocate buffer
        info->buffer = new uint8_t[info->size];

        // start read
        boost::asio::async_read(info->socket,
                // read size of packet
                boost::asio::buffer(info->buffer, info->size),
                // bind handler
                boost::bind(
                        // bind parameters
                        &rfcomm::handle_read_data, this,
                        // handler parameters
                        placeholders::error, placeholders::bytes_transferred, info
                )
        );
}

void rfcomm::handle_read_data(const error_code& error, size_t bytes,
        link_info* info) {

        // ignore errors and wait for all data to be received
        if (error || bytes != info->size) {
                if (error) remove_info(info);
                return;
        }

        cout << "received message of size " << info->size << endl;

        // deliver data
        listener->receive_message(this, info->local, info->remote, info->buffer, info->size );

        // free buffers and reset size buffer
        delete [] info->buffer;
        for (size_t i=0; i<4; i++) info->size_[i] = 0;

        start_read(info);
}

void rfcomm::start_write( link_info* info ) {
        // do not start writing if sending is in progress
        if (info->sending || !info->up || info->send_buffer.size()==0) return;

        cout << "Sending messages..." << endl;

        // safely remove data from deque
        info->mutex.lock();
        link_data data = info->send_buffer.front();
        info->send_buffer.pop_front();
        info->mutex.unlock();

        boost::array<boost::asio::mutable_buffer, 2> buffer;
        buffer[0] = boost::asio::buffer(data.size_,4);
        buffer[1] = boost::asio::buffer(data.buffer,data.size);

        // start writing
        boost::asio::async_write(info->socket,
                // read size of packet
                buffer,
                // bind handler
                boost::bind(
                        // bind parameters
                        &rfcomm::handle_write_data, this,
                        // handler parameters
                        placeholders::error, placeholders::bytes_transferred,
                        info, data.size, data.buffer
                )
        );
}

void rfcomm::handle_write_data(const error_code& error, size_t bytes,
        link_info* info, size_t size, uint8_t* buffer ) {

        // ignore errors and wait for all data to be sent
        if (error || bytes != (size+4) ) {
                if (error) {
                        cout << "Message sent error" << endl;
                        remove_info(info);
                }
                return;
        }

        cout << "Message sent" << endl;

        // free buffer
        delete [] buffer;

        // restart-write
        start_write(info);
}

}} // namespace ariba::transport