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Rely on the kernel for port allocation (#498)

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* tests: Bind to localhost instead of 0.0.0.0

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* test-runtime: Bind to localhost instead of 0.0.0.0

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* test-runtime: Ask kernel for port allocation

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt: Rely on kernel to provide port allocation

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
This commit is contained in:
Alexandru Vasile
2022-04-05 20:57:02 +03:00
committed by GitHub
parent 120b181825
commit cd4c64c280
2 changed files with 25 additions and 63 deletions
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test-runtime/build.rs
+10 -31
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@@ -24,10 +24,6 @@ use std::{
},
path::Path,
process::Command,
sync::atomic::{
AtomicU16,
Ordering,
},
thread,
time,
};
@@ -49,8 +45,7 @@ async fn run() {
env::var(SUBSTRATE_BIN_ENV_VAR).unwrap_or_else(|_| "substrate".to_owned());
// Run binary.
let port = next_open_port()
.expect("Cannot spawn substrate: no available ports in the given port range");
let port = next_open_port().expect("Cannot spawn substrate: no available ports");
let cmd = Command::new(&substrate_bin)
.arg("--dev")
.arg("--tmp")
@@ -138,33 +133,17 @@ async fn run() {
println!("cargo:rerun-if-changed=build.rs");
}
/// Returns the next open port, or None if no port found in range.
/// Returns the next open port, or None if no port found.
fn next_open_port() -> Option<u16> {
/// The start of the port range to scan.
const START_PORT: u16 = 9900;
/// The end of the port range to scan.
const END_PORT: u16 = 10000;
/// The maximum number of ports to scan before giving up.
const MAX_PORTS: u16 = 1000;
let next_port: AtomicU16 = AtomicU16::new(START_PORT);
let mut ports_scanned = 0u16;
loop {
// Loop back from the beginning if needed
let _ = next_port.compare_exchange(
END_PORT,
START_PORT,
Ordering::SeqCst,
Ordering::SeqCst,
);
let next = next_port.fetch_add(1, Ordering::SeqCst);
if TcpListener::bind(("0.0.0.0", next)).is_ok() {
return Some(next)
}
ports_scanned += 1;
if ports_scanned == MAX_PORTS {
return None
match TcpListener::bind(("127.0.0.1", 0)) {
Ok(listener) => {
if let Ok(address) = listener.local_addr() {
Some(address.port())
} else {
None
}
}
Err(_) => None,
}
}