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/*
* Copyright 2014 Marios Kogias <marioskogias@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY COPYRIGHT HOLDERS ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* In this example we have 2 processes communicating over a unix socket.
* We are going to trace the communication with our library
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <zipkin_c.h>
#define SOCK_PATH "/tmp/socket"
struct message {
char actual_message[20];
struct blkin_trace_info trace_info;
};
void process_a()
{
int i, r;
printf("I am process A: %d\n", getpid());
r = blkin_init();
if (r < 0) {
fprintf(stderr, "Could not initialize blkin\n");
exit(1);
}
/*initialize endpoint*/
struct blkin_endpoint endp;
blkin_init_endpoint(&endp, "10.0.0.1", 5000, "service a");
struct blkin_trace trace;
struct blkin_annotation ant;
struct message msg = {.actual_message = "message"};
char ack;
/*create and bind socket*/
int s, s2, len;
socklen_t t;
struct sockaddr_un local, remote;
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
local.sun_family = AF_UNIX;
strcpy(local.sun_path, SOCK_PATH);
unlink(local.sun_path);
len = strlen(local.sun_path) + sizeof(local.sun_family);
if (bind(s, (struct sockaddr *)&local, len) == -1) {
perror("bind");
exit(1);
}
if (listen(s, 5) == -1) {
perror("listen");
exit(1);
}
printf("Waiting for a connection...\n");
t = sizeof(remote);
if ((s2 = accept(s, (struct sockaddr *)&remote, &t)) == -1) {
perror("accept");
exit(1);
}
printf("Connected.\n");
for (i=0;i<10;i++) {
/*create trace*/
blkin_init_new_trace(&trace, "process a", &endp);
blkin_init_timestamp_annotation(&ant, "start", &endp);
blkin_record(&trace, &ant);
/*set trace fields to message*/
blkin_get_trace_info(&trace, &msg.trace_info);
/*send*/
send(s2, &msg, sizeof(struct message), 0);
/*wait for ack*/
recv(s2, &ack, 1, 0);
/*create annotation and log*/
blkin_init_timestamp_annotation(&ant, "end", &endp);
blkin_record(&trace, &ant);
}
close(s2);
}
void process_b()
{
int i, r;
printf("I am process B: %d\n", getpid());
r = blkin_init();
if (r < 0) {
fprintf(stderr, "Could not initialize blkin\n");
exit(1);
}
/*initialize endpoint*/
struct blkin_endpoint endp;
blkin_init_endpoint(&endp, "10.0.0.2", 5001, "service b");
struct blkin_trace trace;
struct blkin_annotation ant;
struct message msg;
int s, len;
struct sockaddr_un remote;
/*Connect*/
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
printf("Trying to connect...\n");
remote.sun_family = AF_UNIX;
strcpy(remote.sun_path, SOCK_PATH);
len = strlen(remote.sun_path) + sizeof(remote.sun_family);
if (connect(s, (struct sockaddr *)&remote, len) == -1) {
perror("connect");
exit(1);
}
printf("Connected.\n");
for (i=0;i<10;i++) {
recv(s, &msg, sizeof(struct message), 0);
/*create child trace*/
blkin_init_child_info(&trace, &msg.trace_info, &endp, "process b");
/*create annotation and log*/
blkin_init_timestamp_annotation(&ant, "start", &endp);
blkin_record(&trace, &ant);
/*Process...*/
usleep(10);
printf("Message received %s\n", msg.actual_message);
/*create annotation and log*/
blkin_init_timestamp_annotation(&ant, "end", &endp);
blkin_record(&trace, &ant);
/*send ack*/
send(s, "*", 1, 0);
}
}
int main()
{
if (fork()){
process_a();
exit(0);
}
else{
process_b();
exit(0);
}
}
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