use std::collections::HashMap;
use std::fs;
use std::io::{self, ErrorKind};
use std::path::PathBuf;
use std::sync::Arc;
use std::time::SystemTime;
use crate::functions::compute_data_etag;
use crate::mime;
use crate::EntityTag;
use mime::Mime;
#[derive(Debug)]
struct Resource {
path: PathBuf,
mime: Mime,
data: Arc<Vec<u8>>,
etag: EntityTag<'static>,
mtime: Option<SystemTime>,
}
#[derive(Debug)]
pub struct FileResources {
resources: HashMap<&'static str, Resource>,
}
impl FileResources {
#[inline]
pub fn new() -> FileResources {
FileResources {
resources: HashMap::new(),
}
}
#[inline]
pub fn register_resource_file<P: Into<PathBuf>>(
&mut self,
name: &'static str,
file_path: P,
) -> Result<(), io::Error> {
let path = file_path.into();
let metadata = path.metadata()?;
let mtime = metadata.modified().ok();
let data = fs::read(&path)?;
let etag = compute_data_etag(&data);
let mime = match path.extension() {
Some(extension) => {
match extension.to_str() {
Some(extension) => mime_guess::from_ext(extension).first_or_octet_stream(),
None => mime::APPLICATION_OCTET_STREAM,
}
}
None => mime::APPLICATION_OCTET_STREAM,
};
let resource = Resource {
path,
mime,
data: Arc::new(data),
etag,
mtime,
};
self.resources.insert(name, resource);
Ok(())
}
#[inline]
pub fn unregister_resource_file<S: AsRef<str>>(&mut self, name: S) -> Option<PathBuf> {
let name = name.as_ref();
self.resources.remove(name).map(|resource| resource.path)
}
#[inline]
pub fn reload_if_needed(&mut self) -> Result<(), io::Error> {
for resource in self.resources.values_mut() {
let metadata = resource.path.metadata()?;
let (reload, new_mtime) = match resource.mtime {
Some(mtime) => {
match metadata.modified() {
Ok(new_mtime) => (new_mtime > mtime, Some(new_mtime)),
Err(_) => (true, None),
}
}
None => {
match metadata.modified() {
Ok(new_mtime) => (true, Some(new_mtime)),
Err(_) => (true, None),
}
}
};
if reload {
let new_data = fs::read(&resource.path)?;
let new_etag = compute_data_etag(&new_data);
resource.data = Arc::new(new_data);
resource.etag = new_etag;
resource.mtime = new_mtime;
}
}
Ok(())
}
#[allow(clippy::type_complexity)]
#[inline]
pub fn get_resource<S: AsRef<str>>(
&mut self,
name: S,
) -> Result<(Mime, Arc<Vec<u8>>, &EntityTag<'static>), io::Error> {
let name = name.as_ref();
let resource = self.resources.get_mut(name).ok_or_else(|| {
io::Error::new(ErrorKind::NotFound, format!("The name `{}` is not found.", name))
})?;
let metadata = resource.path.metadata()?;
let (reload, new_mtime) = match resource.mtime {
Some(mtime) => {
match metadata.modified() {
Ok(new_mtime) => (new_mtime > mtime, Some(new_mtime)),
Err(_) => (true, None),
}
}
None => {
match metadata.modified() {
Ok(new_mtime) => (true, Some(new_mtime)),
Err(_) => (true, None),
}
}
};
if reload {
let new_data = fs::read(&resource.path)?;
let new_etag = compute_data_etag(&new_data);
resource.data = Arc::new(new_data);
resource.etag = new_etag;
resource.mtime = new_mtime;
}
Ok((resource.mime.clone(), resource.data.clone(), &resource.etag))
}
}
impl Default for FileResources {
#[inline]
fn default() -> Self {
FileResources::new()
}
}