mirror of
https://github.com/denoland/deno.git
synced 2024-10-31 09:14:20 -04:00
95 lines
2.6 KiB
Rust
95 lines
2.6 KiB
Rust
use crate::Extension;
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use crate::JsRuntime;
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use crate::RuntimeOptions;
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use crate::Snapshot;
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use std::path::Path;
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use std::path::PathBuf;
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pub type CompressionCb = dyn Fn(&mut Vec<u8>, &[u8]);
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pub struct CreateSnapshotOptions {
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pub cargo_manifest_dir: &'static str,
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pub snapshot_path: PathBuf,
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pub startup_snapshot: Option<Snapshot>,
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pub extensions: Vec<Extension>,
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pub additional_files: Vec<PathBuf>,
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pub compression_cb: Option<Box<CompressionCb>>,
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}
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pub fn create_snapshot(create_snapshot_options: CreateSnapshotOptions) {
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let mut js_runtime = JsRuntime::new(RuntimeOptions {
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will_snapshot: true,
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startup_snapshot: create_snapshot_options.startup_snapshot,
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extensions: create_snapshot_options.extensions,
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..Default::default()
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});
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// TODO(nayeemrmn): https://github.com/rust-lang/cargo/issues/3946 to get the
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// workspace root.
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let display_root = Path::new(create_snapshot_options.cargo_manifest_dir)
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.parent()
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.unwrap();
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for file in create_snapshot_options.additional_files {
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let display_path = file.strip_prefix(display_root).unwrap_or(&file);
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let display_path_str = display_path.display().to_string();
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js_runtime
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.execute_script(
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&("deno:".to_string() + &display_path_str.replace('\\', "/")),
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&std::fs::read_to_string(&file).unwrap(),
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)
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.unwrap();
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}
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let snapshot = js_runtime.snapshot();
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let snapshot_slice: &[u8] = &snapshot;
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println!("Snapshot size: {}", snapshot_slice.len());
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let maybe_compressed_snapshot: Box<dyn AsRef<[u8]>> =
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if let Some(compression_cb) = create_snapshot_options.compression_cb {
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let mut vec = vec![];
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vec.extend_from_slice(
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&u32::try_from(snapshot.len())
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.expect("snapshot larger than 4gb")
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.to_le_bytes(),
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);
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(compression_cb)(&mut vec, snapshot_slice);
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println!("Snapshot compressed size: {}", vec.len());
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Box::new(vec)
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} else {
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Box::new(snapshot_slice)
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};
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std::fs::write(
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&create_snapshot_options.snapshot_path,
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&*maybe_compressed_snapshot,
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)
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.unwrap();
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println!(
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"Snapshot written to: {} ",
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create_snapshot_options.snapshot_path.display()
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);
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}
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pub fn get_js_files(
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cargo_manifest_dir: &'static str,
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directory: &str,
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) -> Vec<PathBuf> {
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let manifest_dir = Path::new(cargo_manifest_dir);
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let mut js_files = std::fs::read_dir(directory)
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.unwrap()
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.map(|dir_entry| {
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let file = dir_entry.unwrap();
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manifest_dir.join(file.path())
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})
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.filter(|path| {
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path.extension().unwrap_or_default() == "js"
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&& !path.ends_with("99_main.js")
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})
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.collect::<Vec<PathBuf>>();
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js_files.sort();
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js_files
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}
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