37 lines
1.0 KiB
Rust
37 lines
1.0 KiB
Rust
use std::{fs, io, path, pin};
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pub fn open_file(path: &path::Path) -> io::Result<Option<fs::File>> {
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match fs::File::open(path) {
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Ok(file) => Ok(Some(file)),
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Err(err) => match err.kind() {
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io::ErrorKind::NotFound => Ok(None),
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_ => Err(err),
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},
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}
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}
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#[derive(thiserror::Error, Debug)]
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pub enum ParseFileError<ParseError> {
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#[error("io error: {0}")]
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IO(io::Error),
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#[error("parse error")]
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FromStr(ParseError),
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}
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pub fn parse_file<T: std::str::FromStr>(
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path: &path::Path,
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) -> Result<Option<T>, ParseFileError<T::Err>> {
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match fs::read_to_string(path) {
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Ok(s) => Ok(Some(s.parse().map_err(ParseFileError::FromStr)?)),
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Err(err) => match err.kind() {
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io::ErrorKind::NotFound => Ok(None),
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_ => Err(ParseFileError::IO(err)),
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},
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}
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}
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pub type BoxByteStream = futures::stream::BoxStream<'static, io::Result<bytes::Bytes>>;
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pub type BoxFuture<'a, O> = pin::Pin<Box<dyn futures::Future<Output = O> + Send + 'a>>;
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