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Write it all myself

This commit is contained in:
Jake Howard 2023-08-19 18:43:56 +01:00
parent d36996e9e7
commit 1bed74a34e
Signed by: jake
GPG key ID: 57AFB45680EDD477
3 changed files with 103 additions and 505 deletions

462
Cargo.lock generated
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@ -2,277 +2,29 @@
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View file

@ -6,6 +6,4 @@ edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies] [dependencies]
ipc-channel = "0.16.1" rand = "0.8.5"
libc = "0.2.147"
nix = "0.26.2"

View file

@ -1,55 +1,97 @@
use ipc_channel::ipc::*; use rand::{thread_rng, RngCore};
use ipc_channel::ipc; use std::env;
use std::io::Error; use std::fs::remove_file;
use std::io::{BufRead, BufReader, Write};
use std::os::unix::net::{UnixListener, UnixStream};
use std::path::{Path, PathBuf};
use std::process::Command;
use std::thread;
use std::time::{SystemTime, UNIX_EPOCH};
// I'm not actually sure invoking this is indeed unsafe -- but better safe than sorry... const ENV_VAR: &str = "IPC_SOCK_PATH";
pub unsafe fn fork<F: FnOnce()>(child_func: F) -> libc::pid_t {
match libc::fork() { struct SocketServer {
-1 => panic!("Fork failed: {}", Error::last_os_error()), socket_path: PathBuf,
0 => { listener: UnixListener,
child_func(); }
libc::exit(0);
}, impl SocketServer {
pid => pid, fn new() -> Self {
let socket_path = create_socket();
SocketServer {
socket_path: socket_path.clone(),
listener: UnixListener::bind(&socket_path).unwrap(),
}
}
fn run(&self) {
println!("Listening on {}", self.socket_path.display());
for stream in self.listener.incoming() {
println!("New connection");
match stream {
Ok(stream) => {
thread::spawn(|| handle_client(stream));
}
Err(err) => {
println!("Connection failed: {:?}", err);
}
}
}
}
fn path(&self) -> &Path {
&self.socket_path
} }
} }
fn main() { impl Drop for SocketServer {
println!("Hello, world!"); fn drop(&mut self) {
remove_file(&self.socket_path).unwrap();
// server0 = Send server1 to server }
// server1 = server -> client }
// server2 = client -> server
fn create_socket() -> PathBuf {
let (server0, server0_name) = IpcOneShotServer::new().unwrap(); let mut temp_dir = env::temp_dir();
let (server2, server2_name) = IpcOneShotServer::new().unwrap(); let now = SystemTime::now();
dbg!(&server0_name); let seed = thread_rng().next_u32();
dbg!(&server2_name);
let secs = now.duration_since(UNIX_EPOCH).unwrap().as_secs();
let child_pid = unsafe { temp_dir.push(&format!("rust-ipc-{secs}-{seed}.sock"));
fork(|| {
let (tx1, rx1): (IpcSender<String>, IpcReceiver<String>) = ipc::channel().unwrap(); temp_dir
}
// Send Sender back to server so it can talk to us
let tx0 = IpcSender::connect(server0_name).unwrap(); fn handle_client(stream: UnixStream) {
tx0.send(tx1).unwrap(); let reader = BufReader::new(stream);
// Wait for data from server for line in reader.lines() {
let input = rx1.recv().unwrap(); dbg!(line.unwrap());
println!("{}", input); }
// Send data back to server println!("Closed - killing thread");
let tx2: IpcSender<String> = IpcSender::connect(server2_name).unwrap(); }
tx2.send(String::from("Foo")).unwrap();
}) fn client(path: String) {
}; let mut stream = UnixStream::connect(path).unwrap();
// Receive the sender from the client so we can send it data stream.write_all(b"Hello World").unwrap();
let (_, tx1): (_, IpcSender<String>) = server0.accept().unwrap(); }
tx1.send(String::from("Bar")).unwrap();
fn main() {
// Receive data from client if let Ok(path) = env::var(ENV_VAR) {
let (_, received_person): (_, String) = server2.accept().unwrap(); client(path);
println!("{}", received_person); } else {
let server = SocketServer::new();
let _child = Command::new(env::current_exe().unwrap())
.env(ENV_VAR, server.path())
.spawn()
.unwrap();
server.run();
}
} }