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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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include "salticidae/event.h"
#include "salticidae/network.h"
#include "salticidae/stream.h"
void check_err(SalticidaeCError *err) {
if (err->code)
{
fprintf(stderr, "error: %s\n", salticidae_strerror(err->code));
exit(1);
}
}
/** Hello Message. */
const uint8_t MSG_OPCODE_HELLO = 0x0;
const uint8_t MSG_OPCODE_ACK = 0x1;
typedef struct MsgHello {
char *name;
char *text;
} MsgHello;
/** Defines how to serialize the msg. */
msg_t *msg_hello_serialize(const char *name, const char *text) {
datastream_t *serialized = datastream_new();
size_t name_len = strlen(name);
datastream_put_i32(serialized, (uint32_t)htole32(name_len));
datastream_put_data(serialized, name, name_len);
datastream_put_data(serialized, text, strlen(text));
bytearray_t *arr = bytearray_new_moved_from_datastream(serialized);
msg_t *msg = msg_new_moved_from_bytearray(MSG_OPCODE_HELLO, arr);
datastream_free(serialized);
bytearray_free(arr);
return msg;
}
/** Defines how to parse the msg. */
MsgHello msg_hello_unserialize(const msg_t *msg) {
datastream_t *s = msg_consume_payload(msg);
MsgHello res;
uint32_t len;
bool flag; /* ignore the flag (assume all datastream operations are good) */
len = datastream_get_u32(s, &flag);
len = le32toh(len);
char *name = (char *)malloc(len + 1);
memmove(name, datastream_get_data_inplace(s, len), len);
name[len] = 0;
len = datastream_size(s);
char *text = (char *)malloc(len + 1);
memmove(text, datastream_get_data_inplace(s, len), len);
text[len] = 0;
res.name = name;
res.text = text;
datastream_free(s);
return res;
}
msg_t *msg_ack_serialize() {
bytearray_t *arr = bytearray_new();
msg_t *msg = msg_new_moved_from_bytearray(MSG_OPCODE_ACK, arr);
bytearray_free(arr);
return msg;
}
typedef struct MyNet {
msgnetwork_t *net;
const char *name;
} MyNet;
MyNet alice, bob;
SalticidaeCError err;
void on_receive_hello(const msg_t *_msg, const msgnetwork_conn_t *conn, void *userdata) {
msgnetwork_t *net = msgnetwork_conn_get_net(conn);
const char *name = ((MyNet *)userdata)->name;
MsgHello msg = msg_hello_unserialize(_msg);
printf("[%s] %s says %s\n", name, msg.name, msg.text);
free(msg.name);
free(msg.text);
msg_t *ack = msg_ack_serialize();
/* send acknowledgement */
msgnetwork_send_msg(net, ack, conn);
msg_free(ack);
}
void on_receive_ack(const msg_t *msg, const msgnetwork_conn_t *conn, void *userdata) {
const char *name = ((MyNet *)userdata)->name;
printf("[%s] the peer knows\n", name);
}
bool conn_handler(const msgnetwork_conn_t *conn, bool connected, void *userdata) {
msgnetwork_t *net = msgnetwork_conn_get_net(conn);
MyNet *n = (MyNet *)userdata;
const char *name = n->name;
if (connected)
{
if (msgnetwork_conn_get_mode(conn) == CONN_MODE_ACTIVE)
{
printf("[%s] Connected, sending hello.\n", name);
/* send the first message through this connection */
msg_t *hello = msg_hello_serialize(name, "Hello there!");
msgnetwork_send_msg(n->net, hello, conn);
msg_free(hello);
}
else
printf("[%s] Accepted, waiting for greetings.\n", name);
}
else
{
printf("[%s] Disconnected, retrying.\n", name);
/* try to reconnect to the same address */
const netaddr_t *addr = msgnetwork_conn_get_addr(conn);
msgnetwork_connect(net, addr, false, &err); check_err(&err);
}
return true;
}
void error_handler(const SalticidaeCError *err, bool fatal, void *userdata) {
MyNet *n = (MyNet *)userdata;
printf("[%s] Captured %s error during an async call: %s\n",
n->name, fatal ? "fatal" : "recoverable",
salticidae_strerror(err->code));
}
MyNet gen_mynet(const eventcontext_t *ec,
const char *name) {
MyNet res;
SalticidaeCError err;
const msgnetwork_config_t *netconfig = msgnetwork_config_new();
res.net = msgnetwork_new(ec, netconfig, &err); check_err(&err);
msgnetwork_config_free(netconfig);
res.name = name;
return res;
};
static eventcontext_t *ec;
void on_term_signal(int sig, void *userdata) {
eventcontext_stop(ec);
}
int main() {
ec = eventcontext_new();
netaddr_t *alice_addr = netaddr_new_from_sipport("127.0.0.1:12345", &err);
netaddr_t *bob_addr = netaddr_new_from_sipport("127.0.0.1:12346", &err);
/* test two nodes in the same main loop */
alice = gen_mynet(ec, "Alice");
bob = gen_mynet(ec, "Bob");
msgnetwork_reg_handler(alice.net, MSG_OPCODE_HELLO, on_receive_hello, &alice);
msgnetwork_reg_handler(alice.net, MSG_OPCODE_ACK, on_receive_ack, &alice);
msgnetwork_reg_handler(bob.net, MSG_OPCODE_HELLO, on_receive_hello, &bob);
msgnetwork_reg_handler(bob.net, MSG_OPCODE_ACK, on_receive_ack, &bob);
msgnetwork_reg_conn_handler(alice.net, conn_handler, &alice);
msgnetwork_reg_conn_handler(bob.net, conn_handler, &bob);
/* start all threads */
msgnetwork_start(alice.net);
msgnetwork_start(bob.net);
/* accept incoming connections */
msgnetwork_listen(alice.net, alice_addr, &err); check_err(&err);
msgnetwork_listen(bob.net, bob_addr, &err); check_err(&err);
/* try to connect once */
msgnetwork_conn_free(msgnetwork_connect(alice.net, bob_addr, false, &err)); check_err(&err);
msgnetwork_conn_free(msgnetwork_connect(bob.net, alice_addr, false, &err)); check_err(&err);
netaddr_free(alice_addr);
netaddr_free(bob_addr);
/* the main loop can be shutdown by ctrl-c or kill */
sigev_t *ev_sigint = sigev_new(ec, on_term_signal, NULL);
sigev_t *ev_sigterm = sigev_new(ec, on_term_signal, NULL);
sigev_add(ev_sigint, SIGINT);
sigev_add(ev_sigterm, SIGTERM);
/* enter the main loop */
eventcontext_dispatch(ec);
msgnetwork_free(alice.net);
msgnetwork_free(bob.net);
sigev_free(ev_sigint);
sigev_free(ev_sigterm);
eventcontext_free(ec);
return 0;
}
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