/** * Copyright (c) 2018 Cornell University. * * Author: Ted Yin * * 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 #include #include #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; struct MyNet: public MsgNetworkByteOp { const std::string name; const NetAddr peer; MyNet(const salticidae::EventContext &ec, const std::string name, const NetAddr &peer): MsgNetwork(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)); } 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(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; }