/
cache.rs
140 lines (129 loc) · 3.47 KB
/
cache.rs
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use crate::disk_cache::DiskCache;
use crate::errors::get_error_class_name;
use crate::file_fetcher::FileFetcher;
use deno_core::error::AnyError;
use deno_core::futures::FutureExt;
use deno_core::serde::Deserialize;
use deno_core::serde::Serialize;
use deno_core::ModuleSpecifier;
use deno_graph::source::CacheInfo;
use deno_graph::source::LoadFuture;
use deno_graph::source::LoadResponse;
use deno_graph::source::Loader;
use deno_runtime::permissions::Permissions;
use std::sync::Arc;
#[derive(Debug, Deserialize, Serialize)]
pub struct EmitMetadata {
pub version_hash: String,
}
pub enum CacheType {
Emit,
SourceMap,
TypeScriptBuildInfo,
Version,
}
/// A trait which provides a concise implementation to getting and setting
/// values in a cache.
pub trait Cacher {
/// Get a value from the cache.
fn get(
&self,
cache_type: CacheType,
specifier: &ModuleSpecifier,
) -> Option<String>;
/// Set a value in the cache.
fn set(
&self,
cache_type: CacheType,
specifier: &ModuleSpecifier,
value: String,
) -> Result<(), AnyError>;
}
/// A "wrapper" for the FileFetcher and DiskCache for the Deno CLI that provides
/// a concise interface to the DENO_DIR when building module graphs.
pub struct FetchCacher {
disk_cache: DiskCache,
dynamic_permissions: Permissions,
file_fetcher: Arc<FileFetcher>,
root_permissions: Permissions,
}
impl FetchCacher {
pub fn new(
disk_cache: DiskCache,
file_fetcher: FileFetcher,
root_permissions: Permissions,
dynamic_permissions: Permissions,
) -> Self {
let file_fetcher = Arc::new(file_fetcher);
Self {
disk_cache,
dynamic_permissions,
file_fetcher,
root_permissions,
}
}
}
impl Loader for FetchCacher {
fn get_cache_info(&self, specifier: &ModuleSpecifier) -> Option<CacheInfo> {
let local = self.file_fetcher.get_local_path(specifier)?;
if local.is_file() {
let location = &self.disk_cache.location;
let emit = self
.disk_cache
.get_cache_filename_with_extension(specifier, "js")
.map(|p| location.join(p))
.filter(|p| p.is_file());
let map = self
.disk_cache
.get_cache_filename_with_extension(specifier, "js.map")
.map(|p| location.join(p))
.filter(|p| p.is_file());
Some(CacheInfo {
local: Some(local),
emit,
map,
})
} else {
None
}
}
fn load(
&mut self,
specifier: &ModuleSpecifier,
is_dynamic: bool,
) -> LoadFuture {
let specifier = specifier.clone();
let mut permissions = if is_dynamic {
self.dynamic_permissions.clone()
} else {
self.root_permissions.clone()
};
let file_fetcher = self.file_fetcher.clone();
async move {
file_fetcher
.fetch(&specifier, &mut permissions)
.await
.map_or_else(
|err| {
if let Some(err) = err.downcast_ref::<std::io::Error>() {
if err.kind() == std::io::ErrorKind::NotFound {
return Ok(None);
}
} else if get_error_class_name(&err) == "NotFound" {
return Ok(None);
}
Err(err)
},
|file| {
Ok(Some(LoadResponse::Module {
specifier: file.specifier,
maybe_headers: file.maybe_headers,
content: file.source,
}))
},
)
}
.boxed()
}
}