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use std::{
io::{self, ErrorKind::*},
net::{IpAddr, Ipv4Addr},
};
#[cfg(doc)]
use crate::protocols::{self, Handshake, Reading, Writing};
/// The node's configuration. See the source of [`Config::default`] for the defaults.
#[derive(Debug, Clone)]
pub struct Config {
/// A user-friendly identifier of the node. It is visible in the logs, where it allows nodes to be
/// distinguished more easily if multiple are run at the same time.
///
/// note: If set to `None`, the node will automatically be assigned a sequential, zero-based numeric identifier.
pub name: Option<String>,
/// The IP address the node's connection listener should bind to.
///
/// note: If set to `None`, the node will not listen for inbound connections at all.
pub listener_ip: Option<IpAddr>,
/// The desired listening port of the node. If [`Config::allow_random_port`] is set to `true`, the node
/// will attempt to bind its listener to a different port if the desired one is not available.
///
/// note: [`Config::listener_ip`] must not be `None` in order for it to have any effect.
pub desired_listening_port: Option<u16>,
/// Allow listening on a different port if [`Config::desired_listening_port`] is unavailable.
///
/// note: [`Config::listener_ip`] must not be `None` in order for it to have any effect.
pub allow_random_port: bool,
/// The list of IO errors considered fatal and causing the connection to be dropped.
///
/// note: The node needs to implement the [`Reading`] and/or [`Writing`] protocol in order for it to have any effect.
pub fatal_io_errors: Vec<io::ErrorKind>,
/// The maximum number of active connections the node can maintain at any given time.
///
/// note: This number can very briefly be breached by 1 in case of inbound connection attempts. It can never be
/// breached by outbound connection attempts, though.
pub max_connections: u16,
}
impl Default for Config {
fn default() -> Self {
#[cfg(feature = "test")]
fn default_ip() -> Option<IpAddr> {
Some(IpAddr::V4(Ipv4Addr::LOCALHOST))
}
#[cfg(not(feature = "test"))]
fn default_ip() -> Option<IpAddr> {
Some(IpAddr::V4(Ipv4Addr::UNSPECIFIED))
}
Self {
name: None,
listener_ip: default_ip(),
desired_listening_port: None,
allow_random_port: true,
fatal_io_errors: vec![
ConnectionReset,
ConnectionAborted,
BrokenPipe,
InvalidData,
UnexpectedEof,
],
max_connections: 100,
}
}
}