From b3d7df55357ea6fc6f5141b64a9638ddb39b0f63 Mon Sep 17 00:00:00 2001
From: Igor Zinkovsky <igor@deno.com>
Date: Wed, 17 Apr 2024 07:19:55 -0700
Subject: perf: v8 code cache (#23081)
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This PR enables V8 code cache for ES modules and for `require` scripts
through `op_eval_context`. Code cache artifacts are transparently stored
and fetched using sqlite db and are passed to V8. `--no-code-cache` can
be used to disable.

---------

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>
---
 runtime/fs_util.rs | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)

(limited to 'runtime/fs_util.rs')

diff --git a/runtime/fs_util.rs b/runtime/fs_util.rs
index f7c006a91..09b107300 100644
--- a/runtime/fs_util.rs
+++ b/runtime/fs_util.rs
@@ -1,6 +1,8 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
 
+use deno_ast::ModuleSpecifier;
 use deno_core::anyhow::Context;
+use deno_core::error::uri_error;
 use deno_core::error::AnyError;
 pub use deno_core::normalize_path;
 use std::path::Path;
@@ -18,6 +20,60 @@ pub fn resolve_from_cwd(path: &Path) -> Result<PathBuf, AnyError> {
   }
 }
 
+/// Attempts to convert a specifier to a file path. By default, uses the Url
+/// crate's `to_file_path()` method, but falls back to try and resolve unix-style
+/// paths on Windows.
+pub fn specifier_to_file_path(
+  specifier: &ModuleSpecifier,
+) -> Result<PathBuf, AnyError> {
+  let result = if specifier.scheme() != "file" {
+    Err(())
+  } else if cfg!(windows) {
+    match specifier.to_file_path() {
+      Ok(path) => Ok(path),
+      Err(()) => {
+        // This might be a unix-style path which is used in the tests even on Windows.
+        // Attempt to see if we can convert it to a `PathBuf`. This code should be removed
+        // once/if https://github.com/servo/rust-url/issues/730 is implemented.
+        if specifier.scheme() == "file"
+          && specifier.host().is_none()
+          && specifier.port().is_none()
+          && specifier.path_segments().is_some()
+        {
+          let path_str = specifier.path();
+          match String::from_utf8(
+            percent_encoding::percent_decode(path_str.as_bytes()).collect(),
+          ) {
+            Ok(path_str) => Ok(PathBuf::from(path_str)),
+            Err(_) => Err(()),
+          }
+        } else {
+          Err(())
+        }
+      }
+    }
+  } else {
+    specifier.to_file_path()
+  };
+  match result {
+    Ok(path) => Ok(path),
+    Err(()) => Err(uri_error(format!(
+      "Invalid file path.\n  Specifier: {specifier}"
+    ))),
+  }
+}
+
+pub fn code_timestamp(specifier: &str) -> Result<u64, AnyError> {
+  let specifier = ModuleSpecifier::parse(specifier)?;
+  let path = specifier_to_file_path(&specifier)?;
+  #[allow(clippy::disallowed_methods)]
+  let timestamp = std::fs::metadata(path)?
+    .modified()?
+    .duration_since(std::time::UNIX_EPOCH)?
+    .as_millis() as u64;
+  Ok(timestamp)
+}
+
 #[cfg(test)]
 mod tests {
   use super::*;
@@ -69,4 +125,22 @@ mod tests {
     let absolute_expected = cwd.join(expected);
     assert_eq!(resolve_from_cwd(expected).unwrap(), absolute_expected);
   }
+
+  #[test]
+  fn test_specifier_to_file_path() {
+    run_success_test("file:///", "/");
+    run_success_test("file:///test", "/test");
+    run_success_test("file:///dir/test/test.txt", "/dir/test/test.txt");
+    run_success_test(
+      "file:///dir/test%20test/test.txt",
+      "/dir/test test/test.txt",
+    );
+
+    fn run_success_test(specifier: &str, expected_path: &str) {
+      let result =
+        specifier_to_file_path(&ModuleSpecifier::parse(specifier).unwrap())
+          .unwrap();
+      assert_eq!(result, PathBuf::from(expected_path));
+    }
+  }
 }
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