pkgs/ok_http: Stream response bodies. (#1233)

pkgs/ok_http/android/src/main/kotlin/com/example/ok_http/AsyncInputStreamReader.kt

@@ -0,0 +1,63 @@
+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+package com.example.ok_http
+
+import java.io.IOException
+import java.io.InputStream
+import java.util.concurrent.ExecutorService
+import java.util.concurrent.Executors
+import java.util.concurrent.Future
+
+
+/**
+ * Callback interface utilized by the [AsyncInputStreamReader].
+ */
+interface DataCallback {
+    fun onDataRead(data: ByteArray)
+    fun onFinished()
+    fun onError(e: IOException)
+}
+
+/**
+ * Provides functions to read data from an InputStream asynchronously.
+ */
+class AsyncInputStreamReader {
+    private val executorService: ExecutorService = Executors.newSingleThreadExecutor()
+
+    /**
+     * Reads data from an InputStream asynchronously using an executor service.
+     *
+     * @param inputStream The InputStream to read from
+     * @param callback The DataCallback to call when data is read, finished, or an error occurs
+     *
+     * @return Future<*>
+     */
+    fun readAsync(inputStream: InputStream, callback: DataCallback): Future<*> {
+        return executorService.submit {
+            try {
+                val buffer = ByteArray(4096)
+                var bytesRead: Int
+                while (inputStream.read(buffer).also { bytesRead = it } != -1) {
+                    val byteArray = buffer.copyOfRange(0, bytesRead)
+                    callback.onDataRead(byteArray)
+                }
+
+            } catch (e: IOException) {
+                callback.onError(e)
+            } finally {
+                try {
+                    inputStream.close()
+                } catch (e: IOException) {
+                    callback.onError(e)
+                }
+                callback.onFinished()
+            }
+        }
+    }
+
+    fun shutdown() {
+        executorService.shutdown()
+    }
+}

pkgs/ok_http/example/integration_test/client_test.dart

@@ -15,18 +15,13 @@ void main() async {
 
 Future<void> testConformance() async {
   group('ok_http client', () {
-    testRequestBody(OkHttpClient());
-    testResponseBody(OkHttpClient(), canStreamResponseBody: false);
-    testRequestHeaders(OkHttpClient());
-    testRequestMethods(OkHttpClient(), preservesMethodCase: true);
-    testResponseHeaders(OkHttpClient(), supportsFoldedHeaders: false);
-    testResponseStatusLine(OkHttpClient());
-    testCompressedResponseBody(OkHttpClient());
-    testRedirect(OkHttpClient());
-    testServerErrors(OkHttpClient());
-    testClose(OkHttpClient.new);
-    testIsolate(OkHttpClient.new);
-    testRequestCookies(OkHttpClient(), canSendCookieHeaders: true);
-    testResponseCookies(OkHttpClient(), canReceiveSetCookieHeaders: true);
+    testAll(
+      OkHttpClient.new,
+      canStreamRequestBody: false,
+      preservesMethodCase: true,
+      supportsFoldedHeaders: false,
+      canSendCookieHeaders: true,
+      canReceiveSetCookieHeaders: true,
+    );
   });
 }

pkgs/ok_http/jnigen.yaml

@@ -28,6 +28,8 @@ classes:
   - "okhttp3.Dispatcher"
   - "okhttp3.Cache"
   - "com.example.ok_http.RedirectInterceptor"
+  - "com.example.ok_http.AsyncInputStreamReader"
+  - "com.example.ok_http.DataCallback"
 
 # Exclude the deprecated methods listed below
 # They cause syntax errors during the `dart format` step of JNIGen.