surma
d7b78ed0fd
Activation path (review T6R): a broken plugin or a stray file in /plugins blocks no activation; candidates replace their own entries; discovery has a 10 s deadline and its process is stopped after the answer; an unchanged hash keeps plugin.prev.wasm; activations run in their own task; the watcher is not recursive; no duplicate services; rpc.retired waits for live processes of its version; reads and hashes on blocking threads. Guest I/O and per-call paths: a stdin write error is EOF, stdout and stderr are drained before the status; stderr is lossy UTF-8 and goes to the journal from its own reader; compiled components are freed; shutdown starts no new processes; lock queues drop stopping processes; compile before the admission gate; CommandPre per component; core.unlock in order; null errors are successes; the journal thread survives SQLite errors. sausage init builds the agent with cargo.build; sausage without a command creates ./world. The console reads plain lines without a terminal. PROTOCOL.md and DECISIONS.md describe the decided rules. The flake tests the whole workspace and checks the packaged cargo.build.
130 lines
4.0 KiB
Rust
130 lines
4.0 KiB
Rust
//! Execution of native futures and WASI processes, including transport drainage.
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use crate::{
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Host, NativeContext, NativePlugin,
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process::ProcessInfo,
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runtime::{Instance, InstanceConfig},
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};
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use serde_json::{Value, json};
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use tokio::sync::mpsc;
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impl Host {
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/// Run one process and retain its cleanup guard until all transport reads finish.
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pub(crate) async fn run_process(
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&self,
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pid: String,
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info: ProcessInfo,
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component: Option<std::sync::Arc<crate::runtime::Prepared>>,
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native: Option<NativePlugin>,
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incoming: mpsc::UnboundedReceiver<Value>,
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has_id: bool,
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) -> String {
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if let Some(native) = native {
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let context = NativeContext {
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host: self.clone(),
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pid: pid.clone(),
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};
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let result = native(context, info.method, info.params).await;
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self.answer(&pid, result);
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return "exit 0".into();
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}
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let result = self
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.run_guest(&pid, &info, &component.unwrap(), incoming, has_id)
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.await;
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result.unwrap_or_else(|error| error.to_string())
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}
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/// Drain stdout before deciding whether the guest returned an answer.
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async fn run_guest(
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&self,
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pid: &str,
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info: &ProcessInfo,
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component: &crate::runtime::Prepared,
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mut incoming: mpsc::UnboundedReceiver<Value>,
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has_id: bool,
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) -> anyhow::Result<String> {
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let (memory, tracker, store_ended) = {
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let state = self.0.state.lock().unwrap();
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let p = state.processes.get(pid).unwrap();
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(p.memory.clone(), p.files.clone(), p.store_ended.clone())
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};
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let config = InstanceConfig {
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filesystem: self.mounts(Some(pid.into()), memory, tracker).await?,
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store_ended,
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network: true,
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env: vec![
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("SAUSAGE_PID".into(), pid.into()),
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("SAUSAGE_PLUGIN".into(), info.plugin.clone()),
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(
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"SAUSAGE_PARENT".into(),
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info.parent.clone().unwrap_or_else(|| "core".into()),
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),
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],
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};
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let mut instance = self
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.0
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.runtime
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.start_logged(
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component,
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config,
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self.0.journal.clone(),
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pid.into(),
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info.plugin.clone(),
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)
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.await?;
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let mut initial = json!({
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"jsonrpc": "2.0",
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"method": info.method,
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"params": info.params,
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});
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if has_id {
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initial["id"] = json!(pid);
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}
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let mut stdin_open = self.forward_input(pid, &mut instance, Some(initial)).await;
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loop {
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tokio::select! {
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line = instance.stdout.recv() => {
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if !self.stdout_line(pid,line) { break; }
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}
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value = incoming.recv(), if stdin_open => {
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stdin_open = self.forward_input(pid,&mut instance,value).await;
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}
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}
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}
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Ok(instance.wait().await.to_string())
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}
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/// Close stdin only after the queued responses reach the guest.
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async fn forward_input(
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&self,
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pid: &str,
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instance: &mut Instance,
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value: Option<Value>,
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) -> bool {
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if let Some(value) = value
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&& self.write_input(pid, instance, value).await.is_ok()
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{
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return true;
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}
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instance.stdin.take();
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false
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}
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async fn write_input(
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&self,
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pid: &str,
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instance: &mut Instance,
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value: Value,
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) -> std::io::Result<()> {
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instance
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.send_line(&value.to_string(), |line| self.output(pid, line))
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.await
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}
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fn stdout_line(&self, pid: &str, line: Option<String>) -> bool {
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if let Some(line) = line {
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self.output(pid, line);
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true
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} else {
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false
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}
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}
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}
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