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https://github.com/denoland/deno.git
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966ce7de8a
This commit adds blob URL support. Blob URLs are stored in a process global storage, that can be accessed from all workers, and the module loader. Blob URLs can be created using `URL.createObjectURL` and revoked using `URL.revokeObjectURL`. This commit does not add support for `fetch`ing blob URLs. This will be added in a follow up commit.
104 lines
2.6 KiB
Rust
104 lines
2.6 KiB
Rust
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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use deno_core::error::null_opbuf;
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use deno_core::error::AnyError;
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use deno_core::url::Url;
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use deno_core::JsRuntime;
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use deno_core::ModuleSpecifier;
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use deno_core::ZeroCopyBuf;
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use std::collections::HashMap;
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use std::path::PathBuf;
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use std::sync::Arc;
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use std::sync::Mutex;
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use uuid::Uuid;
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#[derive(Clone)]
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pub struct Blob {
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pub data: Vec<u8>,
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pub media_type: String,
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}
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pub struct Location(pub Url);
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#[derive(Default, Clone)]
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pub struct BlobUrlStore(Arc<Mutex<HashMap<Url, Blob>>>);
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impl BlobUrlStore {
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pub fn get(&self, url: &ModuleSpecifier) -> Result<Option<Blob>, AnyError> {
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let blob_store = self.0.lock().unwrap();
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Ok(blob_store.get(url).cloned())
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}
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pub fn insert(&self, blob: Blob, maybe_location: Option<Url>) -> Url {
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let origin = if let Some(location) = maybe_location {
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location.origin().ascii_serialization()
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} else {
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"null".to_string()
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};
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let id = Uuid::new_v4();
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let url = Url::parse(&format!("blob:{}/{}", origin, id)).unwrap();
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let mut blob_store = self.0.lock().unwrap();
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blob_store.insert(url.clone(), blob);
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url
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}
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pub fn remove(&self, url: &ModuleSpecifier) {
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let mut blob_store = self.0.lock().unwrap();
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blob_store.remove(&url);
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}
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}
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pub fn op_file_create_object_url(
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state: &mut deno_core::OpState,
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media_type: String,
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zero_copy: Option<ZeroCopyBuf>,
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) -> Result<String, AnyError> {
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let data = zero_copy.ok_or_else(null_opbuf)?;
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let blob = Blob {
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data: data.to_vec(),
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media_type,
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};
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let maybe_location = state.try_borrow::<Location>();
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let blob_store = state.borrow::<BlobUrlStore>();
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let url =
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blob_store.insert(blob, maybe_location.map(|location| location.0.clone()));
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Ok(url.to_string())
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}
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pub fn op_file_revoke_object_url(
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state: &mut deno_core::OpState,
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url: String,
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_zero_copy: Option<ZeroCopyBuf>,
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) -> Result<(), AnyError> {
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let url = Url::parse(&url)?;
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let blob_store = state.borrow::<BlobUrlStore>();
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blob_store.remove(&url);
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Ok(())
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}
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/// Load and execute the javascript code.
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pub fn init(isolate: &mut JsRuntime) {
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let files = vec![
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("deno:op_crates/file/01_file.js", include_str!("01_file.js")),
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(
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"deno:op_crates/file/02_filereader.js",
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include_str!("02_filereader.js"),
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),
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(
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"deno:op_crates/file/03_blob_url.js",
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include_str!("03_blob_url.js"),
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),
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];
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for (url, source_code) in files {
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isolate.execute(url, source_code).unwrap();
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}
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}
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pub fn get_declaration() -> PathBuf {
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PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("lib.deno_file.d.ts")
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}
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