262 lines
11 KiB
Rust
262 lines
11 KiB
Rust
use preserves_schema::Codec;
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use std::sync::Arc;
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use syndicate::actor::*;
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use syndicate::enclose;
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use syndicate::error::Error;
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use syndicate::supervise::{Supervisor, SupervisorConfiguration};
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use tokio::process;
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use crate::counter;
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use crate::language::language;
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use crate::lifecycle;
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use crate::schemas::external_services::*;
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use syndicate_macros::during;
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pub fn on_demand(t: &mut Activation, config_ds: Arc<Cap>, root_ds: Arc<Cap>) {
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t.spawn(syndicate::name!("on_demand", module = module_path!()), move |t| {
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Ok(during!(t, config_ds, language(), <run-service $spec: DaemonService>, |t| {
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Supervisor::start(
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t,
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syndicate::name!(parent: None, "daemon", service = ?spec),
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SupervisorConfiguration::default(),
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enclose!((config_ds, spec) lifecycle::updater(config_ds, spec)),
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enclose!((config_ds, root_ds) move |t|
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enclose!((config_ds, root_ds, spec) run(t, config_ds, root_ds, spec))))
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}))
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});
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}
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fn cannot_start<R>() -> Result<R, Error> {
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Err("Cannot start daemon process")?
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}
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impl DaemonSpec {
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fn elaborate(self) -> FullDaemonSpec {
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match self {
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DaemonSpec::Simple(command_line) => FullDaemonSpec {
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argv: *command_line,
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env: DaemonEnv::Absent,
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dir: DaemonDir::Absent,
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clear_env: ClearEnv::Absent,
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ready_on_start: ReadyOnStart::Absent,
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restart: RestartField::Absent,
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},
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DaemonSpec::Full(spec) => *spec,
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}
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}
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}
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impl CommandLine {
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fn elaborate(self) -> FullCommandLine {
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match self {
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CommandLine::Shell(s) => FullCommandLine {
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program: "sh".to_owned(),
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args: vec!["-c".to_owned(), s],
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},
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CommandLine::Full(command_line) => *command_line,
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}
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}
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}
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struct DaemonProcessInstance {
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name: tracing::Span,
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facet: FacetRef,
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cmd: process::Command,
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announce_presumed_readiness: bool,
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unready_configs: Arc<Field<isize>>,
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restart_policy: RestartPolicy,
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}
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impl DaemonProcessInstance {
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async fn handle_exit(self, error_message: Option<String>) -> Result<LinkedTaskTermination, Error> {
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let delay_ms = if let None = error_message { 200 } else { 1000 };
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let sleep_after_exit = || tokio::time::sleep(std::time::Duration::from_millis(delay_ms));
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Ok(match self.restart_policy {
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RestartPolicy::Always => {
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sleep_after_exit().await;
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self.start()?;
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LinkedTaskTermination::Normal
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}
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RestartPolicy::OnError => {
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if let None = error_message {
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LinkedTaskTermination::KeepFacet
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} else {
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sleep_after_exit().await;
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self.start()?;
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LinkedTaskTermination::Normal
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}
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}
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RestartPolicy::All => {
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match error_message {
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None => LinkedTaskTermination::KeepFacet,
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Some(s) => Err(s.as_str())?,
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}
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}
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})
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}
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fn start(mut self) -> ActorResult {
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tracing::trace!("DaemonProcessInstance start (outer)");
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self.facet.clone().activate(
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Account::new(syndicate::name!(parent: self.name.clone(), "instance")), |t| {
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tracing::trace!("DaemonProcessInstance start (inner)");
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t.facet(|t| {
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tracing::trace!(cmd = ?self.cmd, "starting");
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let mut child = match self.cmd.spawn() {
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Ok(child) => child,
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Err(e) => {
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tracing::info!(spawn_err = ?e);
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t.linked_task(syndicate::name!(parent: self.name.clone(), "fail"),
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self.handle_exit(Some(format!("{}", e))));
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return Ok(());
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}
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};
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tracing::info!(pid = ?child.id(), cmd = ?self.cmd, "started");
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if self.announce_presumed_readiness {
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counter::adjust(t, &self.unready_configs, -1);
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}
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t.linked_task(syndicate::name!(parent: self.name.clone(), "wait"), async move {
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tracing::trace!("waiting for process exit");
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let status = child.wait().await?;
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tracing::info!(?status);
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self.handle_exit(
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if status.success() { None } else { Some(format!("{}", status)) }).await
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});
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Ok(())
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})?;
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Ok(())
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})
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}
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}
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fn run(
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t: &mut Activation,
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config_ds: Arc<Cap>,
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_root_ds: Arc<Cap>,
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service: DaemonService,
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) -> ActorResult {
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let spec = language().unparse(&service);
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let unready_configs = t.field(1isize);
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t.dataflow({
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let mut handle = None;
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let ready = lifecycle::ready(&spec);
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enclose!((config_ds, unready_configs) move |t| {
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let busy_count = *t.get(&unready_configs);
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tracing::trace!(?busy_count);
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config_ds.update(t, &mut handle, language(), if busy_count == 0 { Some(&ready) } else { None });
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Ok(())
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})
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})?;
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Ok(during!(t, config_ds, language(), <daemon #(service.id.0) $config>, {
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let unready_configs = unready_configs.clone();
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|t: &mut Activation| {
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counter::adjust(t, &unready_configs, 1);
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match language().parse::<DaemonSpec>(&config) {
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Ok(config) => {
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tracing::info!(?config);
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let config = config.elaborate();
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let facet = t.facet.clone();
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t.linked_task(syndicate::name!("subprocess"), async move {
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let argv = config.argv.elaborate();
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let mut cmd = process::Command::new(argv.program);
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cmd.args(argv.args);
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match config.dir {
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DaemonDir::Present { dir } => { cmd.current_dir(dir); () },
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DaemonDir::Absent => (),
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DaemonDir::Invalid { dir } => {
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tracing::error!(?dir, "Invalid working directory");
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return cannot_start();
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}
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}
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match config.clear_env {
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ClearEnv::Present { clear_env: true } => { cmd.env_clear(); () },
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ClearEnv::Present { clear_env: false } => (),
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ClearEnv::Absent => (),
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ClearEnv::Invalid { clear_env } => {
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tracing::error!(?clear_env, "Invalid clearEnv setting");
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return cannot_start();
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}
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}
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match config.env {
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DaemonEnv::Present { env } => {
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for (k, v) in env {
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if let Some(env_variable) = match k {
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EnvVariable::String(k) => Some(k),
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EnvVariable::Symbol(k) => Some(k),
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EnvVariable::Invalid(env_variable) => {
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tracing::error!(?env_variable,
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"Invalid environment variable name");
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return cannot_start();
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}
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} {
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match v {
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EnvValue::Set(value) => { cmd.env(env_variable, value); () }
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EnvValue::Remove => { cmd.env_remove(env_variable); () }
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EnvValue::Invalid(value) => {
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tracing::error!(?env_variable, ?value,
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"Invalid environment variable value");
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return cannot_start();
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}
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}
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}
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}
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}
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DaemonEnv::Absent => (),
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DaemonEnv::Invalid { env } => {
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tracing::error!(?env, "Invalid daemon environment");
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return cannot_start();
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}
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}
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let announce_presumed_readiness = match config.ready_on_start {
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ReadyOnStart::Present { ready_on_start } => ready_on_start,
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ReadyOnStart::Absent => true,
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ReadyOnStart::Invalid { ready_on_start } => {
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tracing::error!(?ready_on_start, "Invalid readyOnStart value");
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return cannot_start();
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}
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};
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let restart_policy = match config.restart {
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RestartField::Present { restart } => *restart,
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RestartField::Absent => RestartPolicy::All,
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RestartField::Invalid { restart } => {
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tracing::error!(?restart, "Invalid restart value");
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return cannot_start();
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}
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};
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cmd.stdin(std::process::Stdio::null());
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cmd.stdout(std::process::Stdio::inherit());
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cmd.stderr(std::process::Stdio::inherit());
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cmd.kill_on_drop(true);
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(DaemonProcessInstance {
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name: tracing::Span::current(),
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facet,
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cmd,
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announce_presumed_readiness,
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unready_configs,
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restart_policy,
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}).start()?;
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Ok(LinkedTaskTermination::KeepFacet)
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});
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Ok(())
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}
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Err(_) => {
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tracing::error!(?config, "Invalid DaemonSpec");
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return Ok(());
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}
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}
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}
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}))
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}
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