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//
// sio_client_impl.cpp
// SioChatDemo
//
// Created by Melo Yao on 4/3/15.
// Copyright (c) 2015 Melo Yao. All rights reserved.
//
#include "sio_client_impl.h"
#include <sstream>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <mutex>
#include <cmath>
// Comment this out to disable handshake logging to stdout
#if DEBUG || _DEBUG
#define LOG(x) std::cout << x
#else
#define LOG(x)
#endif
using boost::posix_time::milliseconds;
using namespace std;
namespace sio
{
/*************************public:*************************/
client_impl::client_impl() :
m_ping_interval(0),
m_ping_timeout(0),
m_network_thread(),
m_con_state(con_closed),
m_reconn_delay(5000),
m_reconn_delay_max(25000),
m_reconn_attempts(0xFFFFFFFF),
m_reconn_made(0)
{
using websocketpp::log::alevel;
#ifndef DEBUG
m_client.clear_access_channels(alevel::all);
m_client.set_access_channels(alevel::connect|alevel::disconnect|alevel::app);
#endif
// Initialize the Asio transport policy
m_client.init_asio();
// Bind the clients we are using
using websocketpp::lib::placeholders::_1;
using websocketpp::lib::placeholders::_2;
m_client.set_open_handler(lib::bind(&client_impl::on_open,this,_1));
m_client.set_close_handler(lib::bind(&client_impl::on_close,this,_1));
m_client.set_fail_handler(lib::bind(&client_impl::on_fail,this,_1));
m_client.set_message_handler(lib::bind(&client_impl::on_message,this,_1,_2));
#if SIO_TLS
m_client.set_tls_init_handler(lib::bind(&client_impl::on_tls_init,this,_1));
#endif
m_packet_mgr.set_decode_callback(lib::bind(&client_impl::on_decode,this,_1));
m_packet_mgr.set_encode_callback(lib::bind(&client_impl::on_encode,this,_1,_2));
}
client_impl::~client_impl()
{
this->sockets_invoke_void(&sio::socket::on_close);
sync_close();
}
void client_impl::connect(const string& uri, const map<string,string>& query, const map<string, string>& headers)
{
if(m_reconn_timer)
{
m_reconn_timer->cancel();
m_reconn_timer.reset();
}
if(m_network_thread)
{
if(m_con_state == con_closing||m_con_state == con_closed)
{
//if client is closing, join to wait.
//if client is closed, still need to join,
//but in closed case,join will return immediately.
m_network_thread->join();
m_network_thread.reset();//defensive
}
else
{
//if we are connected, do nothing.
return;
}
}
m_con_state = con_opening;
m_base_url = uri;
m_reconn_made = 0;
string query_str;
for(map<string,string>::const_iterator it=query.begin();it!=query.end();++it){
query_str.append("&");
query_str.append(it->first);
query_str.append("=");
string query_str_value=encode_query_string(it->second);
query_str.append(query_str_value);
}
m_query_string=move(query_str);
m_http_headers = headers;
this->reset_states();
m_client.get_io_service().dispatch(lib::bind(&client_impl::connect_impl,this,uri,m_query_string));
m_network_thread.reset(new thread(lib::bind(&client_impl::run_loop,this)));//uri lifecycle?
}
socket::ptr const& client_impl::socket(string const& nsp)
{
lock_guard<mutex> guard(m_socket_mutex);
string aux;
if(nsp == "")
{
aux = "/";
}
else if( nsp[0] != '/')
{
aux.append("/",1);
aux.append(nsp);
}
else
{
aux = nsp;
}
auto it = m_sockets.find(aux);
if(it!= m_sockets.end())
{
return it->second;
}
else
{
pair<const string, socket::ptr> p(aux,shared_ptr<sio::socket>(new sio::socket(this,aux)));
return (m_sockets.insert(p).first)->second;
}
}
void client_impl::close()
{
m_con_state = con_closing;
this->sockets_invoke_void(&sio::socket::close);
m_client.get_io_service().dispatch(lib::bind(&client_impl::close_impl, this,close::status::normal,"End by user"));
}
void client_impl::sync_close()
{
m_con_state = con_closing;
this->sockets_invoke_void(&sio::socket::close);
m_client.get_io_service().dispatch(lib::bind(&client_impl::close_impl, this,close::status::normal,"End by user"));
if(m_network_thread)
{
m_network_thread->join();
m_network_thread.reset();
}
}
/*************************protected:*************************/
void client_impl::send(packet& p)
{
m_packet_mgr.encode(p);
}
void client_impl::remove_socket(string const& nsp)
{
lock_guard<mutex> guard(m_socket_mutex);
auto it = m_sockets.find(nsp);
if(it!= m_sockets.end())
{
m_sockets.erase(it);
}
}
boost::asio::io_service& client_impl::get_io_service()
{
return m_client.get_io_service();
}
void client_impl::on_socket_closed(string const& nsp)
{
if(m_socket_close_listener)m_socket_close_listener(nsp);
}
void client_impl::on_socket_opened(string const& nsp)
{
if(m_socket_open_listener)m_socket_open_listener(nsp);
}
/*************************private:*************************/
void client_impl::run_loop()
{
m_client.run();
m_client.reset();
m_client.get_alog().write(websocketpp::log::alevel::devel,
"run loop end");
}
void client_impl::connect_impl(const string& uri, const string& queryString)
{
do{
websocketpp::uri uo(uri);
ostringstream ss;
#if SIO_TLS
ss<<"wss://";
#else
ss<<"ws://";
#endif
const std::string host(uo.get_host());
// As per RFC2732, literal IPv6 address should be enclosed in "[" and "]".
if(host.find(':')!=std::string::npos){
ss<<"["<<uo.get_host()<<"]";
} else {
ss<<uo.get_host();
}
ss<<":"<<uo.get_port()<<"/socket.io/?EIO=4&transport=websocket";
if(m_sid.size()>0){
ss<<"&sid="<<m_sid;
}
ss<<"&t="<<time(NULL)<<queryString;
lib::error_code ec;
client_type::connection_ptr con = m_client.get_connection(ss.str(), ec);
if (ec) {
m_client.get_alog().write(websocketpp::log::alevel::app,
"Get Connection Error: "+ec.message());
break;
}
for( auto&& header: m_http_headers ) {
con->replace_header(header.first, header.second);
}
m_client.connect(con);
return;
}
while(0);
if(m_fail_listener)
{
m_fail_listener();
}
}
void client_impl::close_impl(close::status::value const& code,string const& reason)
{
LOG("Close by reason:"<<reason << endl);
if(m_reconn_timer)
{
m_reconn_timer->cancel();
m_reconn_timer.reset();
}
if (m_con.expired())
{
cerr << "Error: No active session" << endl;
}
else
{
lib::error_code ec;
m_client.close(m_con, code, reason, ec);
}
}
void client_impl::send_impl(shared_ptr<const string> const& payload_ptr,frame::opcode::value opcode)
{
if(m_con_state == con_opened)
{
lib::error_code ec;
m_client.send(m_con,*payload_ptr,opcode,ec);
if(ec)
{
cerr<<"Send failed,reason:"<< ec.message()<<endl;
}
}
}
void client_impl::ping(const boost::system::error_code& ec)
{
if(ec || m_con.expired())
{
if (ec != boost::asio::error::operation_aborted)
LOG("ping exit,con is expired?"<<m_con.expired()<<",ec:"<<ec.message()<<endl){};
return;
}
packet p(packet::frame_ping);
m_packet_mgr.encode(p, [&](bool /*isBin*/,shared_ptr<const string> payload)
{
lib::error_code ec;
this->m_client.send(this->m_con, *payload, frame::opcode::text, ec);
});
if(m_ping_timer)
{
boost::system::error_code e_code;
m_ping_timer->expires_from_now(milliseconds(m_ping_interval), e_code);
m_ping_timer->async_wait(lib::bind(&client_impl::ping,this,lib::placeholders::_1));
}
if(!m_ping_timeout_timer)
{
m_ping_timeout_timer.reset(new boost::asio::deadline_timer(m_client.get_io_service()));
boost::system::error_code timeout_ec;
m_ping_timeout_timer->expires_from_now(milliseconds(m_ping_timeout), timeout_ec);
m_ping_timeout_timer->async_wait(lib::bind(&client_impl::timeout_pong, this,lib::placeholders::_1));
}
}
void client_impl::timeout_pong(const boost::system::error_code &ec)
{
if(ec)
{
return;
}
LOG("Pong timeout"<<endl);
m_client.get_io_service().dispatch(lib::bind(&client_impl::close_impl, this,close::status::policy_violation,"Pong timeout"));
}
void client_impl::timeout_reconnect(boost::system::error_code const& ec)
{
if(ec)
{
return;
}
if(m_con_state == con_closed)
{
m_con_state = con_opening;
m_reconn_made++;
this->reset_states();
LOG("Reconnecting..."<<endl);
if(m_reconnecting_listener) m_reconnecting_listener();
m_client.get_io_service().dispatch(lib::bind(&client_impl::connect_impl,this,m_base_url,m_query_string));
}
}
unsigned client_impl::next_delay() const
{
//no jitter, fixed power root.
unsigned reconn_made = min<unsigned>(m_reconn_made,32);//protect the pow result to be too big.
return static_cast<unsigned>(min<double>(m_reconn_delay * pow(1.5,reconn_made),m_reconn_delay_max));
}
socket::ptr client_impl::get_socket_locked(string const& nsp)
{
lock_guard<mutex> guard(m_socket_mutex);
auto it = m_sockets.find(nsp);
if(it != m_sockets.end())
{
return it->second;
}
else
{
return socket::ptr();
}
}
void client_impl::sockets_invoke_void(void (sio::socket::*fn)(void))
{
map<const string,socket::ptr> socks;
{
lock_guard<mutex> guard(m_socket_mutex);
socks.insert(m_sockets.begin(),m_sockets.end());
}
for (auto it = socks.begin(); it!=socks.end(); ++it) {
((*(it->second)).*fn)();
}
}
void client_impl::on_fail(connection_hdl)
{
m_con.reset();
m_con_state = con_closed;
this->sockets_invoke_void(&sio::socket::on_disconnect);
LOG("Connection failed." << endl);
if(m_reconn_made<m_reconn_attempts)
{
LOG("Reconnect for attempt:"<<m_reconn_made<<endl);
unsigned delay = this->next_delay();
if(m_reconnect_listener) m_reconnect_listener(m_reconn_made,delay);
m_reconn_timer.reset(new boost::asio::deadline_timer(m_client.get_io_service()));
boost::system::error_code ec;
m_reconn_timer->expires_from_now(milliseconds(delay), ec);
m_reconn_timer->async_wait(lib::bind(&client_impl::timeout_reconnect,this,lib::placeholders::_1));
}
else
{
if(m_fail_listener)m_fail_listener();
}
}
void client_impl::on_open(connection_hdl con)
{
LOG("Connected." << endl);
m_con_state = con_opened;
m_con = con;
m_reconn_made = 0;
this->sockets_invoke_void(&sio::socket::on_open);
this->socket("");
if(m_open_listener)m_open_listener();
}
void client_impl::on_close(connection_hdl con)
{
LOG("Client Disconnected." << endl);
con_state m_con_state_was = m_con_state;
m_con_state = con_closed;
lib::error_code ec;
close::status::value code = close::status::normal;
client_type::connection_ptr conn_ptr = m_client.get_con_from_hdl(con, ec);
if (ec) {
LOG("OnClose get conn failed"<<ec<<endl);
}
else
{
code = conn_ptr->get_local_close_code();
}
m_con.reset();
this->clear_timers();
client::close_reason reason;
// If we initiated the close, no matter what the close status was,
// we'll consider it a normal close. (When using TLS, we can
// sometimes get a TLS Short Read error when closing.)
if(code == close::status::normal || m_con_state_was == con_closing)
{
this->sockets_invoke_void(&sio::socket::on_disconnect);
reason = client::close_reason_normal;
}
else
{
this->sockets_invoke_void(&sio::socket::on_disconnect);
if(m_reconn_made<m_reconn_attempts)
{
LOG("Reconnect for attempt:"<<m_reconn_made<<endl);
unsigned delay = this->next_delay();
if(m_reconnect_listener) m_reconnect_listener(m_reconn_made,delay);
m_reconn_timer.reset(new boost::asio::deadline_timer(m_client.get_io_service()));
boost::system::error_code ec;
m_reconn_timer->expires_from_now(milliseconds(delay), ec);
m_reconn_timer->async_wait(lib::bind(&client_impl::timeout_reconnect,this,lib::placeholders::_1));
return;
}
reason = client::close_reason_drop;
}
if(m_close_listener)
{
m_close_listener(reason);
}
}
void client_impl::on_message(connection_hdl, client_type::message_ptr msg)
{
if (m_ping_timeout_timer) {
boost::system::error_code ec;
m_ping_timeout_timer->expires_from_now(milliseconds(m_ping_timeout),ec);
m_ping_timeout_timer->async_wait(lib::bind(&client_impl::timeout_pong, this,lib::placeholders::_1));
}
// Parse the incoming message according to socket.IO rules
m_packet_mgr.put_payload(msg->get_payload());
}
void client_impl::on_handshake(message::ptr const& message)
{
if(message && message->get_flag() == message::flag_object)
{
const object_message* obj_ptr =static_cast<object_message*>(message.get());
const map<string,message::ptr>* values = &(obj_ptr->get_map());
auto it = values->find("sid");
if (it!= values->end()) {
m_sid = static_pointer_cast<string_message>(it->second)->get_string();
}
else
{
goto failed;
}
it = values->find("pingInterval");
if (it!= values->end()&&it->second->get_flag() == message::flag_integer) {
m_ping_interval = (unsigned)static_pointer_cast<int_message>(it->second)->get_int();
}
else
{
m_ping_interval = 25000;
}
it = values->find("pingTimeout");
if (it!=values->end()&&it->second->get_flag() == message::flag_integer) {
m_ping_timeout = (unsigned) static_pointer_cast<int_message>(it->second)->get_int();
}
else
{
m_ping_timeout = 60000;
}
m_ping_timer.reset(new boost::asio::deadline_timer(m_client.get_io_service()));
boost::system::error_code ec;
m_ping_timer->expires_from_now(milliseconds(m_ping_interval), ec);
if(ec)LOG("ec:"<<ec.message()<<endl){};
m_ping_timer->async_wait(lib::bind(&client_impl::ping,this,lib::placeholders::_1));
LOG("On handshake,sid:"<<m_sid<<",ping interval:"<<m_ping_interval<<",ping timeout"<<m_ping_timeout<<endl);
return;
}
failed:
//just close it.
m_client.get_io_service().dispatch(lib::bind(&client_impl::close_impl, this,close::status::policy_violation,"Handshake error"));
}
void client_impl::on_pong()
{
if(m_ping_timeout_timer)
{
m_ping_timeout_timer->cancel();
m_ping_timeout_timer.reset();
}
}
void client_impl::on_decode(packet const& p)
{
switch(p.get_frame())
{
case packet::frame_message:
{
socket::ptr so_ptr = get_socket_locked(p.get_nsp());
if(so_ptr)so_ptr->on_message_packet(p);
break;
}
case packet::frame_open:
this->on_handshake(p.get_message());
break;
case packet::frame_close:
//FIXME how to deal?
this->close_impl(close::status::abnormal_close, "End by server");
break;
case packet::frame_pong:
this->on_pong();
break;
default:
break;
}
}
void client_impl::on_encode(bool isBinary,shared_ptr<const string> const& payload)
{
LOG("encoded payload length:"<<payload->length()<<endl);
m_client.get_io_service().dispatch(lib::bind(&client_impl::send_impl,this,payload,isBinary?frame::opcode::binary:frame::opcode::text));
}
void client_impl::clear_timers()
{
LOG("clear timers"<<endl);
boost::system::error_code ec;
if(m_ping_timeout_timer)
{
m_ping_timeout_timer->cancel(ec);
m_ping_timeout_timer.reset();
}
if(m_ping_timer)
{
m_ping_timer->cancel(ec);
m_ping_timer.reset();
}
}
void client_impl::reset_states()
{
m_client.reset();
m_sid.clear();
m_packet_mgr.reset();
}
#if SIO_TLS
client_impl::context_ptr client_impl::on_tls_init(connection_hdl conn)
{
context_ptr ctx = context_ptr(new boost::asio::ssl::context(boost::asio::ssl::context::tlsv1));
boost::system::error_code ec;
ctx->set_options(boost::asio::ssl::context::default_workarounds |
boost::asio::ssl::context::no_sslv2 |
boost::asio::ssl::context::single_dh_use,ec);
if(ec)
{
cerr<<"Init tls failed,reason:"<< ec.message()<<endl;
}
return ctx;
}
#endif
std::string client_impl::encode_query_string(const std::string &query){
ostringstream ss;
ss << std::hex;
// Percent-encode (RFC3986) non-alphanumeric characters.
for(const char c : query){
if((c >= 'a' && c <= 'z') || (c>= 'A' && c<= 'Z') || (c >= '0' && c<= '9')){
ss << c;
} else {
ss << '%' << std::uppercase << std::setw(2) << int((unsigned char) c) << std::nouppercase;
}
}
ss << std::dec;
return ss.str();
}
}
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