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|
use std::{
collections::{hash_map::Entry, HashMap},
fmt::Display,
io::{BufWriter, Write},
iter::IntoIterator,
time::Duration,
};
use clap::Args;
use serde::{Deserialize, Serialize};
pub trait SessionWriter {
type Error: Display;
type Writer: Write;
fn writer(&self) -> Result<Self::Writer, std::io::Error>;
fn format(&self, session: &Session) -> Result<String, Self::Error>;
fn filter(&self, session: &Session) -> bool;
}
#[derive(Debug, Clone, Args)]
#[group(skip)]
pub struct Config {
/// Enable sorting
#[arg(long, default_value_t = true)]
pub sort: bool,
}
#[derive(Debug, Default)]
pub struct Sessions {
inner: HashMap<String, State>,
sort: bool,
}
impl Sessions {
pub fn new(Config { sort }: Config) -> Self {
Self {
sort,
..Default::default()
}
}
pub fn write_sessions<W: SessionWriter>(&self, writer: W) -> std::io::Result<()> {
let mut buf_writer = BufWriter::new(writer.writer()?);
let mut sessions: Vec<Session> = self.inner.iter().map(Session::from).collect();
if self.sort {
sessions.sort();
}
for session in sessions {
match writer.format(&session) {
Ok(fmt) if writer.filter(&session) => writeln!(buf_writer, "{fmt}")?,
Err(err) => tracing::warn!(%err, "Failed to format session"),
_ => tracing::debug!(%session, "Skipping filtered session"),
}
}
Ok(())
}
pub fn add(&mut self, item: Session) {
let span = tracing::trace_span!("Entry", ?item);
let _guard = span.enter();
match self.inner.entry(item.name) {
Entry::Occupied(mut o) if item.state.is_better_than(o.get()) => {
tracing::trace!(prev=?o, ?item.state, "New entry is more recent or accurate, replacing");
o.insert(item.state);
}
Entry::Occupied(o) => {
tracing::trace!(existing=?o, ?item.state, "Existing entry is more recent or accurate, skipping");
}
Entry::Vacant(v) => {
tracing::trace!(?item.state, "No previous entry exists, inserting");
v.insert(item.state);
}
}
}
}
impl Extend<Session> for Sessions {
fn extend<T: IntoIterator<Item = Session>>(&mut self, iter: T) {
for item in iter {
self.add(item)
}
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
pub enum State {
Discovered,
#[serde(with = "epoch_timestamp")]
Created(Duration),
#[serde(with = "epoch_timestamp")]
Attached(Duration),
LocalHost,
}
impl State {
pub fn is_better_than(&self, state: &State) -> bool {
match (self, state) {
(&State::LocalHost, _) => false,
(_, &State::LocalHost) => true,
_ => self > state,
}
}
}
mod epoch_timestamp {
use std::time::Duration;
use serde::{self, Deserialize, Deserializer, Serializer};
pub fn serialize<S>(duration: &Duration, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_u64(duration.as_secs())
}
pub fn deserialize<'de, D>(d: D) -> Result<Duration, D::Error>
where
D: Deserializer<'de>,
{
u64::deserialize(d).map(Duration::from_secs)
}
}
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
pub struct Session {
pub state: State,
pub name: String,
}
impl Session {
pub fn discover(name: impl Into<String>) -> Self {
Self {
name: name.into(),
state: State::Discovered,
}
}
pub fn localhost(name: impl Into<String>) -> Self {
Self {
name: name.into(),
state: State::LocalHost,
}
}
}
impl Display for Session {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.name)
}
}
impl From<(String, State)> for Session {
fn from((name, state): (String, State)) -> Self {
Self { state, name }
}
}
impl From<(&String, &State)> for Session {
fn from((name, &state): (&String, &State)) -> Self {
Self {
state,
name: name.to_owned(),
}
}
}
|
