native buffer no need to keep raw napi pointer

crates/napi/src/bindgen_runtime/js_values/buffer.rs

@@ -5,14 +5,12 @@ use crate::{bindgen_prelude::*, check_status, sys, Result, ValueType};
 
 /// zero copy u8 vector shared between rust and napi
 pub struct Buffer {
-  raw: Option<sys::napi_value>,
   inner: mem::ManuallyDrop<Vec<u8>>,
 }
 
 impl From<Vec<u8>> for Buffer {
   fn from(data: Vec<u8>) -> Self {
     Buffer {
-      raw: None,
       inner: mem::ManuallyDrop::new(data),
     }
   }
@@ -67,7 +65,6 @@ impl FromNapiValue for Buffer {
     )?;
 
     Ok(Self {
-      raw: Some(napi_val),
       inner: mem::ManuallyDrop::new(Vec::from_raw_parts(buf as *mut _, len, len)),
     })
   }
@@ -75,26 +72,21 @@ impl FromNapiValue for Buffer {
 
 impl ToNapiValue for Buffer {
   unsafe fn to_napi_value(env: sys::napi_env, mut val: Self) -> Result<sys::napi_value> {
-    match val.raw {
-      Some(raw) => Ok(raw),
-      None => {
-        let len = val.inner.len();
-        let mut ret = ptr::null_mut();
-        check_status!(
-          sys::napi_create_external_buffer(
-            env,
-            len,
-            val.inner.as_mut_ptr() as *mut _,
-            Some(drop_buffer),
-            Box::into_raw(Box::new((len, val.inner.capacity()))) as *mut _,
-            &mut ret,
-          ),
-          "Failed to create napi buffer"
-        )?;
+    let len = val.inner.len();
+    let mut ret = ptr::null_mut();
+    check_status!(
+      sys::napi_create_external_buffer(
+        env,
+        len,
+        val.inner.as_mut_ptr() as *mut _,
+        Some(drop_buffer),
+        Box::into_raw(Box::new((len, val.inner.capacity()))) as *mut _,
+        &mut ret,
+      ),
+      "Failed to create napi buffer"
+    )?;
 
-        Ok(ret)
-      }
-    }
+    Ok(ret)
   }
 }
 
@@ -103,9 +95,3 @@ impl ValidateNapiValue for Buffer {
     vec![ValueType::Object]
   }
 }
-
-impl ToNapiValue for Vec<u8> {
-  unsafe fn to_napi_value(env: sys::napi_env, val: Self) -> Result<sys::napi_value> {
-    Buffer::to_napi_value(env, val.into())
-  }
-}

examples/napi/__test__/typegen.spec.ts.md

@@ -11,7 +11,7 @@ Generated by [AVA](https://avajs.dev).
     `export function getWords(): Array<string>␊
     export function getNums(): Array<number>␊
     export function sumNums(nums: Array<number>): number␊
-    export function readFileAsync(path: string): Promise<Array<number>>␊
+    export function readFileAsync(path: string): Promise<Buffer>␊
     export function getCwd(callback: (arg0: string) => void): void␊
     export function readFile(callback: (arg0: Error | undefined, arg1: string | null) => void): void␊
     export enum Kind { Dog = 0, Cat = 1, Duck = 2 }␊

examples/napi/index.d.ts

@@ -1,7 +1,7 @@
 export function getWords(): Array<string>
 export function getNums(): Array<number>
 export function sumNums(nums: Array<number>): number
-export function readFileAsync(path: string): Promise<Array<number>>
+export function readFileAsync(path: string): Promise<Buffer>
 export function getCwd(callback: (arg0: string) => void): void
 export function readFile(callback: (arg0: Error | undefined, arg1: string | null) => void): void
 export enum Kind { Dog = 0, Cat = 1, Duck = 2 }

examples/napi/src/async.rs

@@ -3,15 +3,14 @@ use napi::bindgen_prelude::*;
 use tokio::fs;
 
 #[napi]
-async fn read_file_async(path: String) -> Result<Vec<u8>> {
+async fn read_file_async(path: String) -> Result<Buffer> {
   fs::read(path)
-    .map(|v| {
-      v.map_err(|e| {
-        Error::new(
-          Status::GenericFailure,
-          format!("failed to read file, {}", e),
-        )
-      })
+    .map(|r| match r {
+      Ok(content) => Ok(content.into()),
+      Err(e) => Err(Error::new(
+        Status::GenericFailure,
+        format!("failed to read file, {}", e),
+      )),
     })
     .await
 }