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use async_trait::async_trait;
use serde::{Deserialize, Serialize};
use std::{
borrow::Cow,
env::current_dir,
io::Error,
path::{Path, PathBuf},
};
use tokio::{fs, io::AsyncReadExt};
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum ConfigFormat {
Yaml,
Toml,
Ron,
Json,
}
impl ConfigFormat {
fn from_filename(filename: &str) -> Option<Self> {
if filename.ends_with(".yaml") || filename.ends_with(".yml") {
Some(Self::Yaml)
} else if filename.ends_with(".toml") || filename.ends_with(".tom") {
Some(Self::Toml)
} else if filename.ends_with(".ron") {
Some(Self::Ron)
} else if filename.ends_with(".json") {
Some(Self::Json)
} else {
None
}
}
}
#[async_trait]
pub trait ConfigFile: Serialize + for<'a> Deserialize<'a> + Default {
type DataType: Serialize + for<'a> Deserialize<'a> + Default + Send + Sync;
fn default_path() -> Result<PathBuf, Error>;
async fn read() -> Self::DataType
where
Self: Sized + Send + Sync,
{
let Ok(path) = Self::default_path() else {
return Self::DataType::default();
};
Self::read_from(path).await
}
async fn read_from(path: impl AsRef<Path> + Send) -> Self::DataType
where
Self: Sized + Send + Sync,
{
let path = path.as_ref();
let file_path = match current_dir() {
Ok(cwd) => cwd.join(path),
Err(e) => {
eprintln!("Failed to get current directory: {}", e);
return Self::DataType::default();
}
};
// Check if file exists
match fs::metadata(&file_path).await {
Ok(_) => {
// Open file
let mut file = match fs::File::open(&file_path).await {
Ok(file) => file,
Err(e) => {
eprintln!("Failed to open file {}: {}", path.display(), e);
return Self::DataType::default();
}
};
let mut contents = String::new();
// Read contents
if let Err(e) = file.read_to_string(&mut contents).await {
eprintln!("Failed to read file {}: {}", path.display(), e);
return Self::DataType::default();
}
// Determine file format
let format = file_path
.file_name()
.and_then(|name| name.to_str())
.and_then(ConfigFormat::from_filename)
.unwrap_or(ConfigFormat::Json); // Default to JSON
// Deserialize based on format
match format {
ConfigFormat::Yaml => serde_yaml::from_str(&contents).unwrap_or_else(|e| {
eprintln!("Failed to parse YAML file {}: {}", path.display(), e);
Self::DataType::default()
}),
ConfigFormat::Toml => toml::from_str(&contents).unwrap_or_else(|e| {
eprintln!("Failed to parse TOML file {}: {}", path.display(), e);
Self::DataType::default()
}),
ConfigFormat::Ron => ron::from_str(&contents).unwrap_or_else(|e| {
eprintln!("Failed to parse RON file {}: {}", path.display(), e);
Self::DataType::default()
}),
ConfigFormat::Json => serde_json::from_str(&contents).unwrap_or_else(|e| {
eprintln!("Failed to parse JSON file {}: {}", path.display(), e);
Self::DataType::default()
}),
}
}
Err(_) => {
// Return default value when file doesn't exist
Self::DataType::default()
}
}
}
async fn write(val: &Self::DataType)
where
Self: Sized + Send + Sync,
{
let Ok(path) = Self::default_path() else {
return;
};
Self::write_to(val, path).await;
}
async fn write_to(val: &Self::DataType, path: impl AsRef<Path> + Send)
where
Self: Sized + Send + Sync,
{
let path = path.as_ref();
if let Some(parent) = path.parent()
&& !parent.exists()
{
let _ = tokio::fs::create_dir_all(parent).await;
}
let file_path = match current_dir() {
Ok(cwd) => cwd.join(path),
Err(e) => {
eprintln!("Failed to get current directory: {}", e);
return;
}
};
// Determine file format
let format = file_path
.file_name()
.and_then(|name| name.to_str())
.and_then(ConfigFormat::from_filename)
.unwrap_or(ConfigFormat::Json); // Default to JSON
let contents = match format {
ConfigFormat::Yaml => serde_yaml::to_string(val).unwrap_or_else(|e| {
eprintln!("Failed to serialize to YAML: {}", e);
String::new()
}),
ConfigFormat::Toml => toml::to_string(val).unwrap_or_else(|e| {
eprintln!("Failed to serialize to TOML: {}", e);
String::new()
}),
ConfigFormat::Ron => {
let mut pretty_config = ron::ser::PrettyConfig::new();
pretty_config.new_line = Cow::from("\n");
pretty_config.indentor = Cow::from(" ");
ron::ser::to_string_pretty(val, pretty_config).unwrap_or_else(|e| {
eprintln!("Failed to serialize to RON: {}", e);
String::new()
})
}
ConfigFormat::Json => serde_json::to_string(val).unwrap_or_else(|e| {
eprintln!("Failed to serialize to JSON: {}", e);
String::new()
}),
};
// Don't write if serialization failed
if contents.is_empty() {
eprintln!(
"Serialization failed for file {}, not writing",
path.display()
);
return;
}
// Write to file
if let Err(e) = fs::write(&file_path, contents).await {
eprintln!("Failed to write file {}: {}", path.display(), e);
}
}
/// Check if the file returned by `default_path` exists
fn exist() -> bool
where
Self: Sized + Send + Sync,
{
let Ok(path) = Self::default_path() else {
return false;
};
path.exists()
}
}
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