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use crate::runtime::RuntimeError;
use crate::value::RuntimeValue;
use serde_json::{Error, Value};
use std::fmt::Debug;
use std::fs::File;
use std::io::Read;
use std::path::PathBuf;
pub trait DataSource: Send + Sync + Debug {
fn get(&self, path: String) -> Result<Option<RuntimeValue>, RuntimeError>;
}
#[derive(Debug)]
pub struct DirectoryDataSource {
root: PathBuf,
}
impl DirectoryDataSource {
pub fn new(root: PathBuf) -> Self {
Self { root }
}
}
impl DataSource for DirectoryDataSource {
fn get(&self, path: String) -> Result<Option<RuntimeValue>, RuntimeError> {
let target = self.root.join(path);
if target.exists() {
if target.is_dir() {
Err(RuntimeError::FileUnreadable(target))
} else if let Some(name) = target.file_name() {
if name.to_string_lossy().ends_with(".json") {
if let Ok(file) = File::open(target.clone()) {
let json: Result<serde_json::Value, _> = serde_json::from_reader(file);
match json {
Ok(json) => Ok(Some(json.into())),
Err(e) => Err(RuntimeError::JsonError(target, e)),
}
} else {
Err(RuntimeError::FileUnreadable(target))
}
} else if let Ok(mut file) = File::open(target.clone()) {
let mut octets = Vec::new();
file.read_to_end(&mut octets);
Ok(Some(RuntimeValue::Octets(octets)))
} else {
Err(RuntimeError::FileUnreadable(target))
}
} else {
Ok(None)
}
} else {
Ok(None)
}
}
}