Adds support for send(byte[],int,int) to server responses

webserver/http2/src/main/java/io/helidon/webserver/http2/Http2ServerResponse.java

@@ -77,11 +77,17 @@ public Http2ServerResponse header(Header header) {
 
     @Override
     public void send(byte[] entityBytes) {
+        send(entityBytes, 0, entityBytes.length);
+    }
+
+
+    @Override
+    public void send(byte[] entityBytes, int position, int length) {
         try {
             if (outputStreamFilter != null) {
                 // in this case we must honor user's request to filter the stream
                 try (OutputStream os = outputStream()) {
-                    os.write(entityBytes);
+                    os.write(entityBytes, position, length);
                 } catch (IOException e) {
                     throw new UncheckedIOException(e);
                 }
@@ -98,25 +104,35 @@ public void send(byte[] entityBytes) {
             isSent = true;
 
             // handle content encoding
-            byte[] bytes = entityBytes(entityBytes);
+            int actualLength = length;
+            int actualPosition = position;
+            byte[] actualBytes = entityBytes(entityBytes, position, length);
+            if (entityBytes != actualBytes) {       // encoding happened, new byte array
+                actualPosition = 0;
+                actualLength = actualBytes.length;
+            }
 
             headers.setIfAbsent(HeaderValues.create(HeaderNames.CONTENT_LENGTH,
                                                     true,
                                                     false,
-                                                    String.valueOf(bytes.length)));
-            headers.setIfAbsent(HeaderValues.create(HeaderNames.DATE, true, false, DateTime.rfc1123String()));
-
+                                                    String.valueOf(actualLength)));
+            headers.setIfAbsent(HeaderValues.create(HeaderNames.DATE, true,
+                                                    false,
+                                                    DateTime.rfc1123String()));
             Http2Headers http2Headers = Http2Headers.create(headers);
             http2Headers.status(status());
             headers.remove(Http2Headers.STATUS_NAME, it -> ctx.log(LOGGER,
                                                                    System.Logger.Level.WARNING,
                                                                    "Status must be configured on response, "
                                                                            + "do not set HTTP/2 pseudo headers"));
 
-            boolean sendTrailers = request.headers().contains(HeaderValues.TE_TRAILERS) || headers.contains(HeaderNames.TRAILER);
+            boolean sendTrailers = request.headers().contains(HeaderValues.TE_TRAILERS)
+                    || headers.contains(HeaderNames.TRAILER);
 
             http2Headers.validateResponse();
-            bytesWritten += stream.writeHeadersWithData(http2Headers, bytes.length, BufferData.create(bytes), !sendTrailers);
+            bytesWritten += stream.writeHeadersWithData(http2Headers, actualLength,
+                                                        BufferData.create(actualBytes, actualPosition, actualLength),
+                                                        !sendTrailers);
 
             if (sendTrailers) {
                 bytesWritten += stream.writeTrailers(Http2Headers.create(trailers));

webserver/tests/http2/src/test/java/io/helidon/webserver/tests/http2/SendBytesTest.java

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2024 Oracle and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.helidon.webserver.tests.http2;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.nio.charset.StandardCharsets;
+import java.time.Duration;
+
+import io.helidon.http.Status;
+import io.helidon.webserver.http.HttpRules;
+import io.helidon.webserver.testing.junit5.ServerTest;
+import io.helidon.webserver.testing.junit5.SetUpRoute;
+
+import org.junit.jupiter.api.Test;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+@ServerTest
+class SendBytesTest {
+    private static final int START = 16;
+    private static final int LENGTH = 9;
+    private static final String ENTITY = "The quick brown fox jumps over the lazy dog";
+
+    private final HttpClient client;
+    private final URI uri;
+
+    SendBytesTest(URI uri) {
+        this.uri = uri;
+        client = HttpClient.newBuilder()
+                .version(HttpClient.Version.HTTP_2)
+                .connectTimeout(Duration.ofSeconds(5))
+                .build();
+    }
+
+    @SetUpRoute
+    static void routing(HttpRules rules) {
+        rules.get("/sendAll", (req, res) ->
+                        res.send(ENTITY.getBytes(StandardCharsets.UTF_8)))
+                .get("/sendPart", (req, res) ->
+                        res.send(ENTITY.getBytes(StandardCharsets.UTF_8), START, LENGTH));
+    }
+
+    /**
+     * Test getting all the entity.
+     */
+    @Test
+    void testAll() throws IOException, InterruptedException {
+        HttpResponse<String> response = client.send(HttpRequest.newBuilder()
+                                                            .uri(uri.resolve("/sendAll"))
+                                                            .GET()
+                                                            .build(), HttpResponse.BodyHandlers.ofString());
+        assertThat(response.statusCode(), is(Status.OK_200.code()));
+        assertThat(response.version(), is(HttpClient.Version.HTTP_2));
+        String entity = response.body();
+        assertThat(entity, is(ENTITY));
+    }
+
+    /**
+     * Test getting part of the entity.
+     */
+    @Test
+    void testPart() throws IOException, InterruptedException {
+        HttpResponse<String> response = client.send(HttpRequest.newBuilder()
+                                                            .uri(uri.resolve("/sendPart"))
+                                                            .GET()
+                                                            .build(), HttpResponse.BodyHandlers.ofString());
+        assertThat(response.statusCode(), is(Status.OK_200.code()));
+        assertThat(response.version(), is(HttpClient.Version.HTTP_2));
+        String entity = response.body();
+        assertThat(entity, is(ENTITY.substring(START, START + LENGTH)));
+    }
+}

webserver/tests/webserver/src/test/java/io/helidon/webserver/tests/SendBytesTest.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2024 Oracle and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.helidon.webserver.tests;
+
+import java.nio.charset.StandardCharsets;
+
+import io.helidon.http.Status;
+import io.helidon.webclient.api.HttpClientResponse;
+import io.helidon.webclient.http1.Http1Client;
+import io.helidon.webserver.http.HttpRules;
+import io.helidon.webserver.testing.junit5.ServerTest;
+import io.helidon.webserver.testing.junit5.SetUpRoute;
+
+import org.junit.jupiter.api.Test;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+/**
+ * Tests sending a part of a byte array.
+ */
+@ServerTest
+class SendBytesTest {
+    private static final int START = 16;
+    private static final int LENGTH = 9;
+    private static final String ENTITY = "The quick brown fox jumps over the lazy dog";
+
+    private final Http1Client http1Client;
+
+    SendBytesTest(Http1Client http1Client) {
+        this.http1Client = http1Client;
+    }
+
+    @SetUpRoute
+    static void routing(HttpRules rules) {
+        rules.get("/sendAll", (req, res) ->
+                        res.send(ENTITY.getBytes(StandardCharsets.UTF_8)))
+                .get("/sendPart", (req, res) ->
+                        res.send(ENTITY.getBytes(StandardCharsets.UTF_8), START, LENGTH));
+    }
+
+    /**
+     * Test getting all the entity.
+     */
+    @Test
+    void testAll() {
+        try (HttpClientResponse r = http1Client.get("/sendAll").request()) {
+            String s = r.entity().as(String.class);
+            assertThat(r.status(), is(Status.OK_200));
+            assertThat(s, is(ENTITY));
+        }
+    }
+
+    /**
+     * Test getting part of the entity.
+     */
+    @Test
+    void testPart() {
+        try (HttpClientResponse r = http1Client.get("/sendPart").request()) {
+            String s = r.entity().as(String.class);
+            assertThat(r.status(), is(Status.OK_200));
+            assertThat(s, is(ENTITY.substring(START, START + LENGTH)));
+        }
+    }
+}

webserver/webserver/src/main/java/io/helidon/webserver/http/ServerResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022, 2023 Oracle and/or its affiliates.
+ * Copyright (c) 2022, 2024 Oracle and/or its affiliates.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@
 package io.helidon.webserver.http;
 
 import java.io.OutputStream;
+import java.util.Arrays;
 import java.util.Optional;
 import java.util.function.UnaryOperator;
 
@@ -112,6 +113,17 @@ default ServerResponse header(String name, String... values) {
      */
     void send(byte[] bytes);
 
+    /**
+     * Send a byte array response.
+     *
+     * @param bytes bytes to send
+     * @param position starting position
+     * @param length number of bytes send
+     */
+    default void send(byte[] bytes, int position, int length) {
+        send(Arrays.copyOfRange(bytes, position, length));
+    }
+
     /**
      * Send an entity, a {@link io.helidon.http.media.MediaContext} will be used to serialize the entity.
      *

webserver/webserver/src/main/java/io/helidon/webserver/http/ServerResponseBase.java

@@ -201,17 +201,30 @@ protected MediaContext mediaContext() {
      * if entity is empty.
      *
      * @param configuredEntity plain bytes
-     * @return encoded bytes
+     * @return encoded bytes or same entity array if encoding is disabled
      */
     protected byte[] entityBytes(byte[] configuredEntity) {
+        return entityBytes(configuredEntity, 0, configuredEntity.length);
+    }
+
+    /**
+     * Entity bytes encoded using content encoding. Does not attempt encoding
+     * if entity is empty.
+     *
+     * @param configuredEntity plain bytes
+     * @param position starting position
+     * @param length number of bytes
+     * @return encoded bytes or same entity array if encoding is disabled
+     */
+    protected byte[] entityBytes(byte[] configuredEntity, int position, int length) {
         byte[] entity = configuredEntity;
-        if (contentEncodingContext.contentEncodingEnabled() && entity.length > 0) {
+        if (contentEncodingContext.contentEncodingEnabled() && length > 0) {
             ContentEncoder encoder = contentEncodingContext.encoder(requestHeaders);
             // we want to preserve optimization here, let's create a new byte array
-            ByteArrayOutputStream baos = new ByteArrayOutputStream(entity.length);
+            ByteArrayOutputStream baos = new ByteArrayOutputStream(length);
             OutputStream os = encoder.apply(baos);
             try {
-                os.write(entity);
+                os.write(entity, position, length);
                 os.close();
             } catch (IOException e) {
                 throw new ServerConnectionException("Failed to write response", e);

webserver/webserver/src/main/java/io/helidon/webserver/http1/Http1ServerResponse.java

@@ -191,26 +191,32 @@ public Http1ServerResponse header(Header header) {
      */
     @Override
     public void send(byte[] bytes) {
+        send(bytes, 0, bytes.length);
+    }
+
+    @Override
+    public void send(byte[] bytes, int position, int length) {
         // if no entity status, we cannot send bytes here
-        if (isNoEntityStatus && bytes.length > 0) {
+        if (isNoEntityStatus && length > 0) {
             status(noEntityInternalError(status()));
             return;
         }
 
         // send bytes to writer
         if (outputStreamFilter == null && !headers.contains(HeaderNames.TRAILER)) {
-            byte[] entity = entityBytes(bytes);
-            BufferData bufferData = responseBuffer(entity);
+            byte[] entity = entityBytes(bytes, position, length);
+            BufferData bufferData = (bytes != entity) ? responseBuffer(entity)
+                    : responseBuffer(entity, position, length);         // no encoding, same length
             bytesWritten = bufferData.available();
             isSent = true;
             request.reset();
             dataWriter.write(bufferData);
             afterSend();
         } else {
             // we should skip encoders if no data is written (e.g. for GZIP)
-            boolean skipEncoders = (bytes.length == 0);
+            boolean skipEncoders = (length == 0);
             try (OutputStream os = outputStream(skipEncoders)) {
-                os.write(bytes);
+                os.write(bytes, position, length);
             } catch (IOException e) {
                 throw new ServerConnectionException("Failed to write response", e);
             }
@@ -371,6 +377,10 @@ private static void writeHeaders(io.helidon.http.Headers headers, BufferData buf
     }
 
     private BufferData responseBuffer(byte[] bytes) {
+        return responseBuffer(bytes, 0, bytes.length);
+    }
+
+    private BufferData responseBuffer(byte[] bytes, int position, int length) {
         if (isSent) {
             throw new IllegalStateException("Response already sent");
         }
@@ -379,39 +389,36 @@ private BufferData responseBuffer(byte[] bytes) {
                                                     + ", do not call send().");
         }
 
-        int contentLength = bytes.length;
         boolean forcedChunkedEncoding = false;
         headers.setIfAbsent(HeaderValues.CONNECTION_KEEP_ALIVE);
 
         if (headers.contains(HeaderValues.TRANSFER_ENCODING_CHUNKED)) {
             headers.remove(HeaderNames.CONTENT_LENGTH);
             // chunked enforced (and even if empty entity, will be used)
             forcedChunkedEncoding = true;
-        } else {
-            if (!headers.contains(HeaderNames.CONTENT_LENGTH)) {
-                headers.contentLength(contentLength);
-            }
+        } else if (!headers.contains(HeaderNames.CONTENT_LENGTH)) {
+            headers.contentLength(length);
         }
 
         Status usedStatus = status();
         sendListener.status(ctx, usedStatus);
         sendListener.headers(ctx, headers);
 
         // give some space for code and headers + entity
-        BufferData responseBuffer = BufferData.growing(256 + bytes.length);
+        BufferData responseBuffer = BufferData.growing(256 + length);
 
         nonEntityBytes(headers, usedStatus, responseBuffer, keepAlive, validateHeaders);
         if (forcedChunkedEncoding) {
-            byte[] hex = Integer.toHexString(contentLength).getBytes(StandardCharsets.US_ASCII);
+            byte[] hex = Integer.toHexString(length).getBytes(StandardCharsets.US_ASCII);
             responseBuffer.write(hex);
             responseBuffer.write('\r');
             responseBuffer.write('\n');
-            responseBuffer.write(bytes);
+            responseBuffer.write(bytes, position, length);
             responseBuffer.write('\r');
             responseBuffer.write('\n');
             responseBuffer.write(TERMINATING_CHUNK);
         } else {
-            responseBuffer.write(bytes);
+            responseBuffer.write(bytes, position, length);
         }
 
         sendListener.data(ctx, responseBuffer);