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client.c
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client.c
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/* *****************************************************************************
Copyright: Boaz Segev, 2019-2023
License: ISC / MIT (choose your license)
Feel free to copy, use and enjoy according to the license provided.
***************************************************************************** */
/* *****************************************************************************
This is a simple TCP/IP and Unix Socket client example. UDP is also available
but untested.
Note that this program uses a single thread, which allows it to ignore some
possible race conditions.
***************************************************************************** */
/* include some of the modules we use... */
#define FIO_CLI
#define FIO_LOG
#define FIO_SERVER
#define FIO_HTTP
#include "fio-stl/include.h"
/** Called When the client socket is attached to the server. */
FIO_SFUNC void on_attach(fio_s *io);
/** Called there's incoming data (from the server). */
FIO_SFUNC void on_data(fio_s *io);
/** Called when the monitored IO is closed or has a fatal error. */
FIO_SFUNC void on_close(void *udata);
/** Socket client protocol */
static fio_protocol_s CLIENT_PROTOCOL = {
.on_attach = on_attach,
.on_data = on_data,
.on_close = on_close,
.on_pubsub = FIO_ON_MESSAGE_SEND_MESSAGE,
.timeout = 30,
};
/** Called there's incoming data (from STDIN / the client socket). */
FIO_SFUNC void on_input(fio_s *io);
/** Called if connection failed to establish. */
FIO_SFUNC void on_failed(void *arg);
/** STDIN protocol (REPL) */
static fio_protocol_s STDIN_PROTOCOL = {
.on_data = on_input,
};
/* Opens the client connection after the server starts (avoid SIGPIPE) */
FIO_SFUNC void open_client_connection(void *is_http);
/* *****************************************************************************
The main code.
***************************************************************************** */
int main(int argc, char const *argv[]) {
/* initialize the CLI options */
fio_cli_start(
argc,
argv,
1, /* require 1 unnamed argument - the address to connect to */
1,
"A simple TCP/IP, Unix or UDP client application. Requires a URL "
"type address. i.e.\n"
"\tNAME <url>\n\n"
"Unix socket examples:\n"
"\tNAME unix://./my.sock\n"
"\tNAME /full/path/to/my.sock\n"
"\nTCP/IP socket examples:\n"
"\tNAME tcp://localhost:3000/\n"
"\tNAME localhost://3000\n"
"\nUDP socket examples:\n"
"\tNAME udp://localhost:3000/\n",
FIO_CLI_INT("--timeout -t (50) ongoing connection timeout in seconds."),
FIO_CLI_INT("--wait -w (5) connection attempt timeout in seconds."),
FIO_CLI_BOOL("--verbose -V -d print out debugging messages."));
/* review CLI for logging */
if (fio_cli_get_bool("-V"))
FIO_LOG_LEVEL = FIO_LOG_LEVEL_DEBUG;
/* review connection timeout */
if (fio_cli_get_i("-t") > 0)
CLIENT_PROTOCOL.timeout = (uint32_t)fio_cli_get_i("-t") * 1000;
void *is_http = NULL;
/* review CLI connection address (in URL format) */
if (!fio_cli_unnamed(0) && fio_cli_get("-b"))
fio_cli_set_unnamed(0, fio_cli_get("-b"));
FIO_ASSERT(fio_cli_unnamed(0), "client address missing");
size_t url_len = strlen(fio_cli_unnamed(0));
FIO_ASSERT(url_len, "client address too short");
FIO_ASSERT(url_len < 1024, "URL address too long");
{ /* select connection client style / protocol */
fio_url_s url = fio_url_parse(fio_cli_unnamed(0), url_len);
if (((url.scheme.len == 4 ||
(url.scheme.len == 5 && ((url.scheme.buf[4] | 0x20) == 's'))) &&
fio_buf2u32u("http") ==
(fio_buf2u32u(url.scheme.buf) | 0x20202020UL)) ||
((url.scheme.len == 2 ||
(url.scheme.len == 3 && ((url.scheme.buf[2] | 0x20) == 's'))) &&
fio_buf2u16u("ws") == (fio_buf2u16u(url.scheme.buf) | 0x2020UL)) ||
((url.scheme.len == 3 ||
(url.scheme.len == 4 && ((url.scheme.buf[3] | 0x20) == 's'))) &&
fio_buf2u32u("sse\xFF") == (fio_buf2u32u(url.scheme.buf) |
fio_buf2u32u("\x20\x20\x20\xFF")))) {
is_http = (void *)1;
}
}
/* set connection task in master process. */
fio_state_callback_add(FIO_CALL_ON_START, open_client_connection, is_http);
/* start server, connection termination will stop it. */
fio_srv_start(0);
FIO_LOG_INFO("* connection terminated.\n");
return 0;
}
/* *****************************************************************************
Opening the client connection.
***************************************************************************** */
FIO_SFUNC void open_client_connection(void *is_http) {
if (is_http) {
/* TODO! HTTP / WebSocket / SSE client */
FIO_LOG_FATAL("HTTP, WebSocket and SSE clients aren't supported yet"
"\n\t\tfor URL: %s",
fio_cli_unnamed(0));
fio_srv_stop();
} else {
FIO_ASSERT(fio_srv_connect(fio_cli_unnamed(0),
.protocol = &CLIENT_PROTOCOL,
.on_failed = on_failed,
.timeout = (fio_cli_get_i("-w") * 1000)),
"Connection error!");
}
}
/* *****************************************************************************
IO callback(s)
***************************************************************************** */
/** Called When the client socket is attached to the server. */
FIO_SFUNC void on_attach(fio_s *io) {
fio_subscribe(.io = io, .channel = FIO_BUF_INFO1("client"));
fio_udata_set(io, (void *)1);
FIO_LOG_INFO("* connection established.\n");
FIO_LOG_DEBUG2("Connected client IO to pub/sub");
/* attach STDIN */
FIO_LOG_DEBUG2("listening to user input on STDIN.");
fio_srv_attach_fd(fileno(stdin), &STDIN_PROTOCOL, NULL, NULL);
}
/** Called there's incoming data (from STDIN / the client socket. */
FIO_SFUNC void on_data(fio_s *io) {
FIO_LOG_DEBUG2("on_data callback called for: %p", io);
char buf[4080];
for (;;) { /* read until done */
size_t l = fio_read(io, buf, 4080);
if (!l)
return;
fwrite(buf, 1, l, stdout); /* test for incomplete `write`? */
}
}
/** Called when the monitored IO is closed or has a fatal error. */
FIO_SFUNC void on_close(void *arg) {
FIO_LOG_DEBUG2("Connection lost, shutting down client.");
fio_srv_stop();
(void)arg;
}
/** Called if connection failed to establish. */
FIO_SFUNC void on_failed(void *arg) {
FIO_LOG_ERROR("Connection failed / no data received: %s", fio_cli_unnamed(0));
on_close(arg);
}
/** Called there's incoming data (from STDIN / the client socket). */
FIO_SFUNC void on_input(fio_s *io) {
struct {
size_t len;
char buf[4080];
} info;
for (;;) { /* read until done */
info.len = fread(info.buf, 1, 4080, stdin);
if (!info.len)
return;
FIO_LOG_DEBUG2("Publishing: %.*s", (int)info.len, info.buf);
fio_publish(.from = io,
.channel = FIO_BUF_INFO1("client"),
.message = FIO_BUF_INFO2(info.buf, info.len));
}
}