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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 salticidae::uint256_t peer_footprint;
+ const NetAddr peer;
+
+ MyNet(const salticidae::EventContext &ec,
+ const std::string &name,
+ const std::string &peer_footprint_hex,
+ const NetAddr &peer):
+ MsgNetwork<uint8_t>(ec, MsgNetwork::Config(
+ ConnPool::Config()
+ .enable_tls(true)
+ .tls_cert_file(name + ".pem")
+ .tls_key_file(name + ".pem")
+ )),
+ name(name),
+ peer_footprint(salticidae::from_hex(peer_footprint_hex)),
+ 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) {
+ bool res = true;
+ if (connected)
+ {
+ auto cert_der = salticidae::get_hash(conn->get_peer_cert()->get_der());
+ res = peer_footprint == cert_der;
+ 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"
+ "The peer certificate footprint is %s (%s).\n",
+ this->name.c_str(), salticidae::get_hex(cert_der).c_str(),
+ res ? "ok" : "fail");
+ }
+ }
+ else
+ {
+ printf("[%s] Disconnected, retrying.\n", this->name.c_str());
+ /* try to reconnect to the same address */
+ connect(conn->get_addr(), false);
+ }
+ return res;
+ });
+ }
+
+ 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", "ed5a9a8c7429dcb235a88244bc69d43d16b35008ce49736b27aaa3042a674043", bob_addr);
+ MyNet bob(ec, "bob", "ef3bea4e72f4d0e85da7643545312e2ff6dded5e176560bdffb1e53b1cef4896", 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);
+ bob.connect(alice_addr);
+
+ /* 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;
+}