Refactors (#15117)

* refactor(tauri-build): make better use of OsString

Co-authored-by: Tony <68118705+Legend-Master@users.noreply.github.com>

* refactor(tauri-build): dont wrap const value in function

* refactor(tauri-build): None codepath is never used, replace Option<Vec> with Vec

* refactor(tauri): use blocking apis where it makes sense

* refactor(tauri): better use of std::fs API

* refactor(tauri): rewind to start

* refactor(tauri): fmt

* add change file

.changes/change-pr-15117.md

@@ -0,0 +1,6 @@
+---
+"tauri-build": patch:enhance
+"tauri": patch:enhance
+---
+
+Simplify async-sync code boundaries, no externally visible changes

crates/tauri-build/src/lib.rs

@@ -411,7 +411,8 @@ impl Attributes {
 }
 
 pub fn is_dev() -> bool {
-  env::var("DEP_TAURI_DEV").expect("missing `cargo:dev` instruction, please update tauri to latest")
+  env::var_os("DEP_TAURI_DEV")
+    .expect("missing `cargo:dev` instruction, please update tauri to latest")
     == "true"
 }
 
@@ -458,7 +459,7 @@ pub fn try_build(attributes: Attributes) -> Result<()> {
 
   println!("cargo:rerun-if-env-changed=TAURI_CONFIG");
 
-  let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();
+  let target_os = env::var_os("CARGO_CFG_TARGET_OS").unwrap();
   let mobile = target_os == "ios" || target_os == "android";
   cfg_alias("desktop", !mobile);
   cfg_alias("mobile", mobile);
@@ -503,7 +504,7 @@ pub fn try_build(attributes: Attributes) -> Result<()> {
   let cargo_toml_path = Path::new("Cargo.toml").canonicalize()?;
   let mut manifest = Manifest::<cargo_toml::Value>::from_path_with_metadata(cargo_toml_path)?;
 
-  let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
+  let out_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
 
   manifest::check(&config, &mut manifest)?;
 
@@ -538,7 +539,7 @@ pub fn try_build(attributes: Attributes) -> Result<()> {
     .bundle
     .resources
     .clone()
-    .unwrap_or_else(|| BundleResources::List(Vec::new()));
+    .unwrap_or(BundleResources::List(Vec::new()));
   if target_triple.contains("windows") {
     if let Some(fixed_webview2_runtime_path) = match &config.bundle.windows.webview_install_mode {
       WebviewInstallMode::FixedRuntime { path } => Some(path),
@@ -682,7 +683,7 @@ pub fn try_build(attributes: Attributes) -> Result<()> {
         }
       }
       "msvc" => {
-        if env::var("STATIC_VCRUNTIME").is_ok_and(|v| v == "true") {
+        if env::var_os("STATIC_VCRUNTIME").is_some_and(|v| v == "true") {
           static_vcruntime::build();
         }
       }

crates/tauri-build/src/manifest.rs

@@ -23,7 +23,7 @@ struct AllowlistedDependency {
   name: String,
   alias: Option<String>,
   kind: DependencyKind,
-  all_cli_managed_features: Option<Vec<&'static str>>,
+  all_cli_managed_features: Vec<&'static str>,
   expected_features: Vec<String>,
 }
 
@@ -33,7 +33,7 @@ pub fn check(config: &Config, manifest: &mut Manifest) -> Result<()> {
       name: "tauri-build".into(),
       alias: None,
       kind: DependencyKind::Build,
-      all_cli_managed_features: Some(vec!["isolation"]),
+      all_cli_managed_features: vec!["isolation"],
       expected_features: match config.app.security.pattern {
         PatternKind::Isolation { .. } => vec!["isolation".to_string()],
         _ => vec![],
@@ -43,12 +43,10 @@ pub fn check(config: &Config, manifest: &mut Manifest) -> Result<()> {
       name: "tauri".into(),
       alias: None,
       kind: DependencyKind::Normal,
-      all_cli_managed_features: Some(
-        AppConfig::all_features()
-          .into_iter()
-          .filter(|f| f != &"tray-icon")
-          .collect(),
-      ),
+      all_cli_managed_features: AppConfig::all_features()
+        .into_iter()
+        .filter(|f| f != &"tray-icon")
+        .collect(),
       expected_features: config
         .app
         .features()
@@ -129,23 +127,13 @@ fn check_features(dependency: Dependency, metadata: &AllowlistedDependency) -> R
     Dependency::Inherited(dep) => dep.features,
   };
 
-  let diff = if let Some(all_cli_managed_features) = &metadata.all_cli_managed_features {
-    features_diff(
-      &features
-        .into_iter()
-        .filter(|f| all_cli_managed_features.contains(&f.as_str()))
-        .collect::<Vec<String>>(),
-      &metadata.expected_features,
-    )
-  } else {
-    features_diff(
-      &features
-        .into_iter()
-        .filter(|f| f.starts_with("allow-"))
-        .collect::<Vec<String>>(),
-      &metadata.expected_features,
-    )
-  };
+  let diff = features_diff(
+    &features
+      .into_iter()
+      .filter(|f| metadata.all_cli_managed_features.contains(&f.as_str()))
+      .collect::<Vec<String>>(),
+    &metadata.expected_features,
+  );
 
   let mut error_message = String::new();
   if !diff.remove.is_empty() {

crates/tauri/src/protocol/asset.rs

@@ -5,10 +5,10 @@
 use crate::{path::SafePathBuf, scope, webview::UriSchemeProtocolHandler};
 use http::{header::*, status::StatusCode, Request, Response};
 use http_range::HttpRange;
+use std::fs::File;
+use std::io::{Read, Seek, Write};
 use std::{borrow::Cow, io::SeekFrom};
 use tauri_utils::mime_type::MimeType;
-use tokio::fs::File;
-use tokio::io::{AsyncReadExt, AsyncSeekExt, AsyncWriteExt};
 
 pub fn get(scope: scope::fs::Scope, window_origin: String) -> UriSchemeProtocolHandler {
   Box::new(
@@ -49,7 +49,7 @@ fn get_response(
   }
 
   // Separate block for easier error handling
-  let mut file = match crate::async_runtime::safe_block_on(File::open(path.clone())) {
+  let mut file = match File::open(path.clone()) {
     Ok(file) => file,
     Err(e) => {
       #[cfg(target_os = "android")]
@@ -70,32 +70,20 @@ fn get_response(
     }
   };
 
-  let (mut file, len, mime_type, read_bytes) = crate::async_runtime::safe_block_on(async move {
-    // get file length
-    let len = {
-      let old_pos = file.stream_position().await?;
-      let len = file.seek(SeekFrom::End(0)).await?;
-      file.seek(SeekFrom::Start(old_pos)).await?;
-      len
-    };
-
+  let len = file.metadata()?.len();
+  let (mime_type, read_bytes) = {
     // get file mime type
-    let (mime_type, read_bytes) = {
-      let nbytes = len.min(8192);
-      let mut magic_buf = Vec::with_capacity(nbytes as usize);
-      let old_pos = file.stream_position().await?;
-      (&mut file).take(nbytes).read_to_end(&mut magic_buf).await?;
-      file.seek(SeekFrom::Start(old_pos)).await?;
-      (
-        MimeType::parse(&magic_buf, &path),
-        // return the `magic_bytes` if we read the whole file
-        // to avoid reading it again later if this is not a range request
-        if len < 8192 { Some(magic_buf) } else { None },
-      )
-    };
-
-    Ok::<(File, u64, String, Option<Vec<u8>>), anyhow::Error>((file, len, mime_type, read_bytes))
-  })?;
+    let nbytes = len.min(8192);
+    let mut magic_buf = Vec::with_capacity(nbytes as usize);
+    (&mut file).take(nbytes).read_to_end(&mut magic_buf)?;
+    file.rewind()?;
+    (
+      MimeType::parse(&magic_buf, &path),
+      // return the `magic_bytes` if we read the whole file
+      // to avoid reading it again later if this is not a range request
+      if len < 8192 { Some(magic_buf) } else { None },
+    )
+  };
 
   resp = resp.header(CONTENT_TYPE, &mime_type);
 
@@ -148,12 +136,12 @@ fn get_response(
       // calculate number of bytes needed to be read
       let nbytes = end + 1 - start;
 
-      let buf = crate::async_runtime::safe_block_on(async move {
+      let buf = {
         let mut buf = Vec::with_capacity(nbytes as usize);
-        file.seek(SeekFrom::Start(start)).await?;
-        file.take(nbytes).read_to_end(&mut buf).await?;
-        Ok::<Vec<u8>, anyhow::Error>(buf)
-      })?;
+        file.seek(SeekFrom::Start(start))?;
+        file.take(nbytes).read_to_end(&mut buf)?;
+        buf
+      };
 
       resp = resp.header(CONTENT_RANGE, format!("bytes {start}-{end}/{len}"));
       resp = resp.header(CONTENT_LENGTH, end + 1 - start);
@@ -186,38 +174,34 @@ fn get_response(
         format!("multipart/byteranges; boundary={boundary}"),
       );
 
-      let buf = crate::async_runtime::safe_block_on(async move {
+      let buf = {
         // multi-part range header
         let mut buf = Vec::new();
 
         for (start, end) in ranges {
           // a new range is being written, write the range boundary
-          buf.write_all(boundary_sep.as_bytes()).await?;
+          buf.write_all(boundary_sep.as_bytes())?;
 
           // write the needed headers `Content-Type` and `Content-Range`
-          buf
-            .write_all(format!("{CONTENT_TYPE}: {mime_type}\r\n").as_bytes())
-            .await?;
-          buf
-            .write_all(format!("{CONTENT_RANGE}: bytes {start}-{end}/{len}\r\n").as_bytes())
-            .await?;
+          buf.write_all(format!("{CONTENT_TYPE}: {mime_type}\r\n").as_bytes())?;
+          buf.write_all(format!("{CONTENT_RANGE}: bytes {start}-{end}/{len}\r\n").as_bytes())?;
 
           // write the separator to indicate the start of the range body
-          buf.write_all("\r\n".as_bytes()).await?;
+          buf.write_all("\r\n".as_bytes())?;
 
           // calculate number of bytes needed to be read
           let nbytes = end + 1 - start;
 
           let mut local_buf = Vec::with_capacity(nbytes as usize);
-          file.seek(SeekFrom::Start(start)).await?;
-          (&mut file).take(nbytes).read_to_end(&mut local_buf).await?;
+          file.seek(SeekFrom::Start(start))?;
+          (&mut file).take(nbytes).read_to_end(&mut local_buf)?;
           buf.extend_from_slice(&local_buf);
         }
         // all ranges have been written, write the closing boundary
-        buf.write_all(boundary_closer.as_bytes()).await?;
+        buf.write_all(boundary_closer.as_bytes())?;
 
-        Ok::<Vec<u8>, anyhow::Error>(buf)
-      })?;
+        buf
+      };
       resp.body(buf.into())
     }
   } else if request.method() == http::Method::HEAD {
@@ -230,11 +214,9 @@ fn get_response(
     let buf = if let Some(b) = read_bytes {
       b
     } else {
-      crate::async_runtime::safe_block_on(async move {
-        let mut local_buf = Vec::with_capacity(len as usize);
-        file.read_to_end(&mut local_buf).await?;
-        Ok::<Vec<u8>, anyhow::Error>(local_buf)
-      })?
+      let mut local_buf = Vec::with_capacity(len as usize);
+      file.read_to_end(&mut local_buf)?;
+      local_buf
     };
     resp = resp.header(CONTENT_LENGTH, len);
     resp.body(buf.into())