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|
mod format;
pub mod source;
use std::fmt::Debug;
use std::path::{Path, PathBuf};
use crate::error::{ConfigError, Result};
use crate::map::Map;
use crate::source::Source;
use crate::value::Value;
use crate::Format;
pub use self::format::FileFormat;
use self::source::FileSource;
pub use self::source::file::FileSourceFile;
pub use self::source::string::FileSourceString;
/// A configuration source backed up by a file.
///
/// It supports optional automatic file format discovery.
#[derive(Clone, Debug)]
#[must_use]
pub struct File<T, F> {
source: T,
/// Format of file (which dictates what driver to use).
format: Option<F>,
/// A required File will error if it cannot be found
required: bool,
}
/// An extension of [`Format`](crate::Format) trait.
///
/// Associates format with file extensions, therefore linking storage-agnostic notion of format to a file system.
pub trait FileStoredFormat: Format {
/// Returns a vector of file extensions, for instance `[yml, yaml]`.
fn file_extensions(&self) -> &'static [&'static str];
}
impl<F> File<source::string::FileSourceString, F>
where
F: FileStoredFormat + 'static,
{
pub fn from_str(s: &str, format: F) -> Self {
Self {
format: Some(format),
required: true,
source: s.into(),
}
}
}
impl<F> File<source::file::FileSourceFile, F>
where
F: FileStoredFormat + 'static,
{
pub fn new(name: &str, format: F) -> Self {
Self {
format: Some(format),
required: true,
source: source::file::FileSourceFile::new(name.into()),
}
}
}
impl File<source::file::FileSourceFile, FileFormat> {
/// Given the basename of a file, will attempt to locate a file by setting its
/// extension to a registered format.
pub fn with_name(name: &str) -> Self {
Self {
format: None,
required: true,
source: source::file::FileSourceFile::new(name.into()),
}
}
}
impl<'a> From<&'a Path> for File<source::file::FileSourceFile, FileFormat> {
fn from(path: &'a Path) -> Self {
Self {
format: None,
required: true,
source: source::file::FileSourceFile::new(path.to_path_buf()),
}
}
}
impl From<PathBuf> for File<source::file::FileSourceFile, FileFormat> {
fn from(path: PathBuf) -> Self {
Self {
format: None,
required: true,
source: source::file::FileSourceFile::new(path),
}
}
}
impl<T, F> File<T, F>
where
F: FileStoredFormat + 'static,
T: FileSource<F>,
{
pub fn format(mut self, format: F) -> Self {
self.format = Some(format);
self
}
/// Set required to false to make a file optional when building the config.
pub fn required(mut self, required: bool) -> Self {
self.required = required;
self
}
}
impl<T, F> Source for File<T, F>
where
F: FileStoredFormat + Debug + Clone + Send + Sync + 'static,
T: Sync + Send + FileSource<F> + 'static,
{
fn clone_into_box(&self) -> Box<dyn Source + Send + Sync> {
Box::new((*self).clone())
}
fn collect(&self) -> Result<Map<String, Value>> {
// Coerce the file contents to a string
let (uri, contents, format) = match self
.source
.resolve(self.format.clone())
.map_err(ConfigError::Foreign)
{
Ok(result) => (result.uri, result.content, result.format),
Err(error) => {
if !self.required {
return Ok(Map::new());
}
return Err(error);
}
};
// Parse the string using the given format
format
.parse(uri.as_ref(), &contents)
.map_err(|cause| ConfigError::FileParse { uri, cause })
}
}
|
