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wip, with clap.

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flabbergast 6 years ago
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/target/
**/*.rs.bk

341
Cargo.lock generated
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8
Cargo.toml
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[package]
name = "gw_tap"
version = "0.1.0"
authors = ["flabbergast <flabbergast@drak.xyz>"]
[dependencies]
rumqtt = "0.10.1"
clap = "~2.27.1"

151
src/main.rs
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#![allow(unused_variables)]
//#![allow(unused_imports)]
#[macro_use] extern crate clap;
extern crate rumqtt;
use std::env;
use std::process;
use std::thread;
use std::io::prelude::*;
use std::io::{self, Write, BufReader};
use std::net::{TcpStream, TcpListener};
use rumqtt::{MqttOptions, MqttClient, MqttCallback, QoS};
// general executable
struct Program {
name: String
}
impl Program {
fn new(name: String) -> Program {
Program { name: name }
}
fn print_error(&self,mesg: String) {
eprintln!("{}: error: {}",self.name,mesg);
}
fn print_fail(&self,mesg: String) -> ! {
self.print_error(mesg);
self.fail();
}
fn exit(&self,status: i32) -> ! { process::exit(status); }
fn fail(&self) -> ! { self.exit(-1); }
}
// process a line incoming from ser2net:
// * publish to mqtt
// * TODO: decode
// * TODO: save to database
fn process_s2n_incoming(mq: &mut rumqtt::MqttClient, msg: String) {
mq.publish("hello/rust", QoS::Level1, msg.into_bytes()).expect("Publish failure");
}
fn main() {
// parse arguments
let matches = clap_app!(gw_tap =>
(version: "0.1.0")
(author: "flabbergast")
(about: "Tap into a TCP sensors gateway")
(@arg port_in: -i --port_in +required +takes_value "port for existing TCP gateway (incoming, to tap into)")
(@arg port_out: -o --port_out +required +takes_value "port to serve data to (outgoing)")
).get_matches();
let port_s2n = value_t_or_exit!(matches, "port_in", u16);
let port_serve = value_t_or_exit!(matches, "port_out", u16);
println!("{}", port_s2n);
println!("{}", port_serve);
let mut args = env::args();
let program = Program::new(
args.next().unwrap_or("test".to_string())
);
// more params
let host_s2n = "10.0.0.134";
let host_serve = "127.0.0.1";
let host_mqtt = "10.0.0.6";
let port_mqtt = 1883;
// params: mqtt
let mqtt_client_options = MqttOptions::new()
.set_keep_alive(5)
.set_reconnect(3)
.set_client_id("jee-to-mqtt-rust")
.set_broker(&format!("{}:{}", host_mqtt, port_mqtt));
// ser2net stream connect
let mut s2n_stream = TcpStream::connect( (host_s2n, port_s2n) )
.unwrap_or_else(|error|
program.print_fail(format!("Can't connect to {}:{}: {}", host_s2n, port_s2n, error.to_string())));
let input_s2n_stream = s2n_stream.try_clone().unwrap();
let input_s2n_reader = BufReader::new(input_s2n_stream);
// callback from inbound mqtt messages
let print_messages_cb = MqttCallback::new()
.on_message(move |message| {
println!("message --> {:?} {:?}", message, message.payload);
});
// mqtt setup and connect
let mut mqtt_client = MqttClient::start(mqtt_client_options, Some(print_messages_cb))
.unwrap_or_else(|error|
program.print_fail(format!("Can't start mqtt client: {}", error.to_string())));
// need to subscribe here, because then 'request' will go into the 'input_handler' thread
let topics = ["env/#"];
mqtt_client.subscribe(topics.iter().map(|t| (*t, QoS::Level0)).collect())
.unwrap_or_else(|error|
program.print_fail(format!("Can't subscribe to mqtt topics {:?}: {}", topics, error.to_string())));
// start tcp server for through messages
let listen_serve = TcpListener::bind( (host_serve, port_serve) )
.unwrap_or_else(|error|
program.print_fail(format!("Can't bind to {}:{}: {}", host_serve, port_serve, error.to_string())));
// thread: process tcp connect requests
let output_serve_handler = thread::spawn(move || {
match listen_serve.accept() {
Ok((stream, _addr)) => {
thread::spawn(|| {
//handle_client(stream)
});
},
//Err(error) => program.print_fail(format!("TcpListener couldn't get a client: {}", error.to_string())),
Err(e) => println!("problem"),
}
});
// thread: consume ser2net input
let input_s2n_handler = thread::spawn(move || {
for w_line in input_s2n_reader.lines() {
match w_line {
Ok(line) => {
process_s2n_incoming(&mut mqtt_client, line);
},
Err(error) => program.print_fail(error.to_string()),
}
}
println!("{}: incoming stream closed, exiting.", program.name);
program.exit(0);
});
let output_s2n_stream = &mut s2n_stream;
let mut user_buffer = String::new();
loop {
io::stdin().read_line(&mut user_buffer).unwrap();
output_s2n_stream.write(user_buffer.as_bytes()).unwrap();
output_s2n_stream.flush().unwrap();
}
}
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