rocket_dyn_templates/engine/
minijinja.rsuse std::sync::Arc;
use std::path::Path;
use std::collections::HashMap;
use rocket::serde::Serialize;
use minijinja::{Environment, Error, ErrorKind, AutoEscape};
use crate::engine::Engine;
impl Engine for Environment<'static> {
const EXT: &'static str = "j2";
fn init<'a>(templates: impl Iterator<Item = (&'a str, &'a Path)>) -> Option<Self> {
let _templates = Arc::new(templates
.map(|(k, p)| (k.to_owned(), p.to_owned()))
.collect::<HashMap<_, _>>());
let templates = _templates.clone();
let mut env = Environment::new();
env.set_loader(move |name| {
let Some(path) = templates.get(name) else {
return Ok(None);
};
match std::fs::read_to_string(path) {
Ok(result) => Ok(Some(result)),
Err(e) if e.kind() == std::io::ErrorKind::NotFound => Ok(None),
Err(e) => Err(
Error::new(ErrorKind::InvalidOperation, "template read failed").with_source(e)
),
}
});
let templates = _templates.clone();
env.set_auto_escape_callback(move |name| {
templates.get(name)
.and_then(|path| path.to_str())
.map(minijinja::default_auto_escape_callback)
.unwrap_or(AutoEscape::None)
});
Some(env)
}
fn render<C: Serialize>(&self, template: &str, context: C) -> Option<String> {
let Ok(templ) = self.get_template(template) else {
error!(template, "requested template does not exist");
return None;
};
match templ.render(context) {
Ok(result) => Some(result),
Err(e) => {
span_error!("templating", template, "failed to render Minijinja template" => {
let mut error = Some(&e as &dyn std::error::Error);
while let Some(err) = error {
error!("{err}");
error = err.source();
}
});
None
}
}
}
}