perf(ext/url): optimize UrlParts op serialization (#11765)

ext/url/00_url.js

@@ -40,9 +40,41 @@
   const SET_SEARCH = 8;
   const SET_USERNAME = 9;
 
-  // Helper function
+  // Helper functions
   function opUrlReparse(href, setter, value) {
-    return core.opSync("op_url_reparse", href, [setter, value]);
+    return _urlParts(core.opSync("op_url_reparse", href, [setter, value]));
+  }
+  function opUrlParse(href, maybeBase) {
+    return _urlParts(core.opSync("op_url_parse", href, maybeBase));
+  }
+  function _urlParts(internalParts) {
+    // WARNING: must match UrlParts serialization rust's url_result()
+    const {
+      0: href,
+      1: hash,
+      2: host,
+      3: hostname,
+      4: origin,
+      5: password,
+      6: pathname,
+      7: port,
+      8: protocol,
+      9: search,
+      10: username,
+    } = internalParts.split("\n");
+    return {
+      href,
+      hash,
+      host,
+      hostname,
+      origin,
+      password,
+      pathname,
+      port,
+      protocol,
+      search,
+      username,
+    };
   }
 
   class URLSearchParams {
@@ -289,7 +321,7 @@
         });
       }
       this[webidl.brand] = webidl.brand;
-      this[_url] = core.opSync("op_url_parse", url, base);
+      this[_url] = opUrlParse(url, base);
     }
 
     [SymbolFor("Deno.privateCustomInspect")](inspect) {
@@ -401,7 +433,7 @@
         prefix,
         context: "Argument 1",
       });
-      this[_url] = core.opSync("op_url_parse", value);
+      this[_url] = opUrlParse(value);
       this.#updateSearchParams();
     }
 

ext/url/lib.rs

@@ -11,7 +11,6 @@ use deno_core::url::quirks;
 use deno_core::url::Url;
 use deno_core::Extension;
 use deno_core::ZeroCopyBuf;
-use serde::Serialize;
 use std::panic::catch_unwind;
 use std::path::PathBuf;
 
@@ -36,20 +35,23 @@ pub fn init() -> Extension {
     .build()
 }
 
-#[derive(Serialize)]
-pub struct UrlParts {
-  href: String,
-  hash: String,
-  host: String,
-  hostname: String,
-  origin: String,
-  password: String,
-  pathname: String,
-  port: String,
-  protocol: String,
-  search: String,
-  username: String,
-}
+// UrlParts is a \n joined string of the following parts:
+// #[derive(Serialize)]
+// pub struct UrlParts {
+//   href: String,
+//   hash: String,
+//   host: String,
+//   hostname: String,
+//   origin: String,
+//   password: String,
+//   pathname: String,
+//   port: String,
+//   protocol: String,
+//   search: String,
+//   username: String,
+// }
+// TODO: implement cleaner & faster serialization
+type UrlParts = String;
 
 /// Parse `UrlParseArgs::href` with an optional `UrlParseArgs::base_href`, or an
 /// optional part to "set" after parsing. Return `UrlParts`.
@@ -137,19 +139,22 @@ fn url_result(
     ))
   })?;
 
-  Ok(UrlParts {
-    href: quirks::href(&url).to_string(),
-    hash: quirks::hash(&url).to_string(),
-    host: quirks::host(&url).to_string(),
-    hostname: quirks::hostname(&url).to_string(),
-    origin: quirks::origin(&url),
-    password: quirks::password(&url).to_string(),
-    pathname: quirks::pathname(&url).to_string(),
-    port: quirks::port(&url).to_string(),
-    protocol: quirks::protocol(&url).to_string(),
-    search: quirks::search(&url).to_string(),
-    username: username.to_string(),
-  })
+  Ok(
+    [
+      quirks::href(&url),
+      quirks::hash(&url),
+      quirks::host(&url),
+      quirks::hostname(&url),
+      &quirks::origin(&url),
+      quirks::password(&url),
+      quirks::pathname(&url),
+      quirks::port(&url),
+      quirks::protocol(&url),
+      quirks::search(&url),
+      username,
+    ]
+    .join("\n"),
+  )
 }
 
 pub fn op_url_parse_search_params(