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use crate::epi::solver::{
ExternalProgramSolver, ExternalProgramSolverFactory, ExternalProgramSolverRecipe,
};
use crate::problem::ProblemSpec;
use crate::registry::FactoryRegistry;
use crate::rng::ArcRng;
use crate::solver::{Solver, SolverFactory, SolverRecipe, SolverSpec};
use crate::trial::{EvaluatedTrial, IdGen, NextTrial};
use crate::{Error, Result};
use lazy_static::lazy_static;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::io::Write as _;
use std::sync::Mutex;
use structopt::StructOpt;
use tempfile::{NamedTempFile, TempPath};
lazy_static! {
static ref TEMP_FILES: Mutex<HashMap<String, TempPath>> = Mutex::new(HashMap::new());
}
#[derive(Debug, Clone, StructOpt, Serialize, Deserialize)]
#[structopt(rename_all = "kebab-case")]
pub struct EmbeddedScriptSolverRecipe {
pub script: String,
pub args: Vec<String>,
}
impl SolverRecipe for EmbeddedScriptSolverRecipe {
type Factory = EmbeddedScriptSolverFactory;
fn create_factory(&self, registry: &FactoryRegistry) -> Result<Self::Factory> {
let path = {
let mut temp_files = track!(TEMP_FILES.lock().map_err(Error::from))?;
if let Some(path) = temp_files.get(&self.script).map(|p| p.to_path_buf()) {
path
} else {
let mut temp = track!(NamedTempFile::new().map_err(Error::from))?;
track!(write!(temp.as_file_mut(), "{}", self.script).map_err(Error::from))?;
let temp = temp.into_temp_path();
#[cfg(unix)]
{
use std::fs;
use std::os::unix::fs::PermissionsExt as _;
track!(
fs::set_permissions(&temp, fs::Permissions::from_mode(0o755))
.map_err(Error::from)
)?;
}
let path = temp.to_path_buf();
temp_files.insert(self.script.clone(), temp);
path
}
};
let args = self.args.clone();
let eppr = ExternalProgramSolverRecipe { path, args };
let inner = track!(eppr.create_factory(registry))?;
Ok(EmbeddedScriptSolverFactory { inner })
}
}
#[derive(Debug)]
pub struct EmbeddedScriptSolverFactory {
inner: ExternalProgramSolverFactory,
}
impl SolverFactory for EmbeddedScriptSolverFactory {
type Solver = EmbeddedScriptSolver;
fn specification(&self) -> Result<SolverSpec> {
track!(self.inner.specification())
}
fn create_solver(&self, rng: ArcRng, problem: &ProblemSpec) -> Result<Self::Solver> {
let inner = track!(self.inner.create_solver(rng, problem))?;
Ok(EmbeddedScriptSolver { inner })
}
}
#[derive(Debug)]
pub struct EmbeddedScriptSolver {
inner: ExternalProgramSolver,
}
impl Solver for EmbeddedScriptSolver {
fn ask(&mut self, idg: &mut IdGen) -> Result<NextTrial> {
track!(self.inner.ask(idg))
}
fn tell(&mut self, trial: EvaluatedTrial) -> Result<()> {
track!(self.inner.tell(trial))
}
}