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/**
* Copyright (c) 2018 Cornell University.
*
* Author: Ted Yin <[email protected]>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <cstdio>
#include <string>
#include <functional>
#include "salticidae/msg.h"
#include "salticidae/event.h"
#include "salticidae/network.h"
#include "salticidae/stream.h"
using salticidae::NetAddr;
using salticidae::DataStream;
using salticidae::MsgNetwork;
using salticidae::htole;
using salticidae::letoh;
using std::placeholders::_1;
using std::placeholders::_2;
/** Hello Message. */
struct MsgHello {
static const uint8_t opcode = 0x0;
DataStream serialized;
std::string name;
std::string text;
/** Defines how to serialize the msg. */
MsgHello(const std::string &name,
const std::string &text) {
serialized << htole((uint32_t)name.length());
serialized << name << text;
}
/** Defines how to parse the msg. */
MsgHello(DataStream &&s) {
uint32_t len;
s >> len;
len = letoh(len);
name = std::string((const char *)s.get_data_inplace(len), len);
len = s.size();
text = std::string((const char *)s.get_data_inplace(len), len);
}
};
/** Acknowledgement Message. */
struct MsgAck {
static const uint8_t opcode = 0x1;
DataStream serialized;
MsgAck() {}
MsgAck(DataStream &&s) {}
};
const uint8_t MsgHello::opcode;
const uint8_t MsgAck::opcode;
using MsgNetworkByteOp = MsgNetwork<uint8_t>;
struct MyNet: public MsgNetworkByteOp {
const std::string name;
const NetAddr peer;
MyNet(const salticidae::EventContext &ec,
const std::string name,
const NetAddr &peer):
MsgNetwork<uint8_t>(ec, MsgNetwork::Config()),
name(name),
peer(peer) {
/* message handler could be a bound method */
reg_handler(
salticidae::generic_bind(&MyNet::on_receive_hello, this, _1, _2));
reg_conn_handler([this](const ConnPool::conn_t &conn, bool connected) {
if (connected)
{
if (conn->get_mode() == ConnPool::Conn::ACTIVE)
{
printf("[%s] Connected, sending hello.\n",
this->name.c_str());
/* send the first message through this connection */
send_msg(MsgHello(this->name, "Hello there!"),
salticidae::static_pointer_cast<Conn>(conn));
}
else
printf("[%s] Accepted, waiting for greetings.\n",
this->name.c_str());
}
else
{
printf("[%s] Disconnected, retrying.\n", this->name.c_str());
/* try to reconnect to the same address */
connect(conn->get_addr(), false);
}
return true;
});
}
void on_receive_hello(MsgHello &&msg, const MyNet::conn_t &conn) {
printf("[%s] %s says %s\n",
name.c_str(),
msg.name.c_str(), msg.text.c_str());
/* send acknowledgement */
send_msg(MsgAck(), conn);
}
};
void on_receive_ack(MsgAck &&msg, const MyNet::conn_t &conn) {
auto net = static_cast<MyNet *>(conn->get_net());
printf("[%s] the peer knows\n", net->name.c_str());
}
int main() {
salticidae::EventContext ec;
NetAddr alice_addr("127.0.0.1:12345");
NetAddr bob_addr("127.0.0.1:12346");
/* test two nodes in the same main loop */
MyNet alice(ec, "Alice", bob_addr);
MyNet bob(ec, "Bob", alice_addr);
/* message handler could be a normal function */
alice.reg_handler(on_receive_ack);
bob.reg_handler(on_receive_ack);
/* start all threads */
alice.start();
bob.start();
/* accept incoming connections */
alice.listen(alice_addr);
bob.listen(bob_addr);
/* try to connect once */
alice.connect(bob_addr, false);
bob.connect(alice_addr, false);
/* the main loop can be shutdown by ctrl-c or kill */
auto shutdown = [&](int) {ec.stop();};
salticidae::SigEvent ev_sigint(ec, shutdown);
salticidae::SigEvent ev_sigterm(ec, shutdown);
ev_sigint.add(SIGINT);
ev_sigterm.add(SIGTERM);
/* enter the main loop */
ec.dispatch();
return 0;
}
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