| 1 | use std::{ |
| 2 | io::{self, BufRead, BufReader, Write}, |
| 3 | os::unix::net::UnixStream, |
| 4 | path::PathBuf, |
| 5 | }; |
| 6 | |
| 7 | use serde::{Deserialize, Serialize, de::DeserializeOwned}; |
| 8 | |
| 9 | use crate::{ |
| 10 | sched::{Need, Reason}, |
| 11 | units::{Bytes, Dur}, |
| 12 | }; |
| 13 | |
| 14 | pub type LeaseId = u64; |
| 15 | |
| 16 | #[derive(Clone, Debug, Serialize, Deserialize)] |
| 17 | pub struct Acquire { |
| 18 | pub need: Need, |
| 19 | pub cwd: PathBuf, |
| 20 | pub cmd: Vec<String>, |
| 21 | pub session: Option<String>, |
| 22 | pub deadline: Option<Dur>, |
| 23 | } |
| 24 | |
| 25 | #[derive(Debug, Serialize, Deserialize)] |
| 26 | #[serde(tag = "op", rename_all = "snake_case")] |
| 27 | pub enum Request { |
| 28 | Acquire(Acquire), |
| 29 | Started { pid: i32 }, |
| 30 | Usage { rss: Bytes }, |
| 31 | Done, |
| 32 | Status, |
| 33 | Kill { lease: LeaseId }, |
| 34 | Extend { lease: LeaseId, by: Dur }, |
| 35 | Watch { lease: LeaseId }, |
| 36 | Overdue { session: String }, |
| 37 | } |
| 38 | |
| 39 | #[derive(Clone, Debug, Serialize, Deserialize)] |
| 40 | pub struct LeaseInfo { |
| 41 | pub id: LeaseId, |
| 42 | pub cmd: Vec<String>, |
| 43 | pub cwd: PathBuf, |
| 44 | pub session: Option<String>, |
| 45 | pub need: Need, |
| 46 | pub heavy: bool, |
| 47 | pub running: bool, |
| 48 | /// seconds since queued or started, whichever it's doing |
| 49 | pub elapsed: u64, |
| 50 | pub rss: Bytes, |
| 51 | pub overdue: bool, |
| 52 | pub waiting: Option<Reason>, |
| 53 | pub position: usize, |
| 54 | } |
| 55 | |
| 56 | #[derive(Debug, Serialize, Deserialize)] |
| 57 | pub struct Status { |
| 58 | pub leases: Vec<LeaseInfo>, |
| 59 | pub ram_free: Bytes, |
| 60 | pub ram_budget: Bytes, |
| 61 | pub cores_free: u32, |
| 62 | pub cores: u32, |
| 63 | } |
| 64 | |
| 65 | #[derive(Debug, Serialize, Deserialize)] |
| 66 | #[serde(tag = "ev", rename_all = "snake_case")] |
| 67 | pub enum Event { |
| 68 | Queued { |
| 69 | lease: LeaseId, |
| 70 | position: usize, |
| 71 | reason: Option<Reason>, |
| 72 | }, |
| 73 | Granted { |
| 74 | lease: LeaseId, |
| 75 | cores: u32, |
| 76 | heavy: bool, |
| 77 | }, |
| 78 | Kill, |
| 79 | Status(Status), |
| 80 | Overdue { |
| 81 | leases: Vec<LeaseInfo>, |
| 82 | }, |
| 83 | Fired { |
| 84 | overdue: bool, |
| 85 | }, |
| 86 | Ok, |
| 87 | Err { |
| 88 | msg: String, |
| 89 | }, |
| 90 | } |
| 91 | |
| 92 | pub fn send<T: Serialize>(stream: &mut UnixStream, msg: &T) -> io::Result<()> { |
| 93 | let mut line = serde_json::to_vec(msg)?; |
| 94 | line.push(b'\n'); |
| 95 | stream.write_all(&line) |
| 96 | } |
| 97 | |
| 98 | pub struct Reader(BufReader<UnixStream>); |
| 99 | |
| 100 | impl Reader { |
| 101 | pub fn new(stream: &UnixStream) -> io::Result<Self> { |
| 102 | Ok(Self(BufReader::new(stream.try_clone()?))) |
| 103 | } |
| 104 | |
| 105 | /// `Ok(None)` on eof |
| 106 | pub fn recv<T: DeserializeOwned>(&mut self) -> io::Result<Option<T>> { |
| 107 | let mut line = String::new(); |
| 108 | if self.0.read_line(&mut line)? == 0 { |
| 109 | return Ok(None); |
| 110 | } |
| 111 | serde_json::from_str(&line) |
| 112 | .map(Some) |
| 113 | .map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e)) |
| 114 | } |
| 115 | } |