add: node to web

README.md

@@ -2,27 +2,32 @@
 Based on **[Borewit/readable-web-to-node-stream](https://github.com/Borewit/readable-web-to-node-stream)**.
 
 # Example
+## Web streams to node stream
 
 ```js
 import Converter from "https://deno.land/x/streamconv/mod.ts";
 
 const res = await fetch("https://mysite.com");
 
 if (res.body) {
-    const stream = new Converter(res.body); // Readable stream instance
+    const stream = Converter.WebToReadable(res.body); // Readable stream instance
     stream.on("data", chunk => console.log(chunk.toString()));
 } else {
     console.log("no stream");
 }
 ```
 
-# License
-(The MIT License)
+## Node stream to web stream
 
-Copyright (c) 2019 Borewit
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+```js
+import Converter from "https://deno.land/x/streamconv/mod.ts";
 
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+const res = await fetch("https://mysite.com");
 
-THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+if (res.body) {
+    const stream = Converter.WebToReadable(res.body);
+    const webstream = Converter.WebToReadable(stream); // web ReadableStream instance
+} else {
+    console.log("no stream");
+}
+```

mod.ts

@@ -1,4 +1,9 @@
-import Conv from "./src/Conv.ts";
+import { convert as WebToReadable } from "./src/Conv.ts";
+import { toWebStream as ReadableToWeb } from "./src/toWeb.ts";
 
-export default Conv;
-export { Conv as Converter }
+export const Converter = {
+    WebToReadable,
+    ReadableToWeb
+}
+
+export default Converter;

src/Conv.ts

@@ -1,21 +1,10 @@
 /*
 based on https://github.com/Borewit/readable-web-to-node-stream
-
-License:
-(The MIT License)
-
-Copyright (c) 2019 Borewit
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
-import { Readable } from "https://deno.land/std@0.88.0/node/stream.ts";
+import { Readable } from "https://deno.land/std/node/stream.ts";
 
-export class StreamConv extends Readable {
+class StreamConv extends Readable {
 
     public bytesRead: number = 0;
     public released = false;
@@ -61,4 +50,6 @@ export class StreamConv extends Readable {
     }
 }
 
-export default StreamConv;
+export function convert(stream: ReadableStream) {
+    return new StreamConv(stream);
+}

src/toWeb.ts

@@ -0,0 +1,61 @@
+/*
+based on https://github.com/xuset/readable-stream-node-to-web
+*/
+
+import { Readable as NodeLikeReadable } from "https://deno.land/std/node/stream.ts";
+
+interface ListenerInterface {
+    data: (chunk: any) => void;
+    end: (chunk: any) => void;
+    close: (err: any) => void;
+    error: (err: any) => void;
+}
+
+export function toWebStream(nodeStream: NodeLikeReadable) {
+    let destroyed = false;
+    const listeners = {} as ListenerInterface;
+
+    function start(controller: any) {
+        listeners['data'] = onData;
+        listeners['end'] = onData;
+        listeners['end'] = onDestroy;
+        listeners['close'] = onDestroy;
+        listeners['error'] = onDestroy;
+        for (const name in listeners) nodeStream.on(name, listeners[name as keyof ListenerInterface])
+
+        nodeStream.pause()
+
+        function onData(chunk: any) {
+            if (destroyed) return
+            controller.enqueue(new Uint8Array(chunk))
+            nodeStream.pause()
+        }
+
+        function onDestroy(err: any) {
+            if (destroyed) return
+            destroyed = true
+
+            for (let name in listeners) nodeStream.removeListener(name, listeners[name as keyof ListenerInterface])
+
+            if (err) controller.error(err)
+            else controller.close()
+        }
+    }
+
+    function pull() {
+        if (destroyed) return
+        nodeStream.resume()
+    }
+
+    function cancel() {
+        destroyed = true
+
+        for (const name in listeners) nodeStream.removeListener(name, listeners[name as keyof ListenerInterface])
+
+        nodeStream.push(null)
+        nodeStream.pause()
+        if (nodeStream.destroy) nodeStream.destroy()
+    }
+
+    return new ReadableStream({ start: start, pull: pull, cancel: cancel })
+}