Improve POJA implementation

http-poja-apache/src/main/java/io/micronaut/http/poja/apache/ApacheServerlessApplication.java

@@ -34,7 +34,9 @@
 import org.apache.hc.core5.http.HttpEntity;
 import org.apache.hc.core5.http.HttpException;
 import org.apache.hc.core5.http.impl.io.DefaultHttpResponseWriter;
+import org.apache.hc.core5.http.impl.io.SessionInputBufferImpl;
 import org.apache.hc.core5.http.impl.io.SessionOutputBufferImpl;
+import org.apache.hc.core5.http.io.SessionInputBuffer;
 import org.apache.hc.core5.http.io.SessionOutputBuffer;
 
 import java.io.IOException;
@@ -57,6 +59,7 @@ public class ApacheServerlessApplication
     private final ExecutorService ioExecutor;
     private final ByteBufferFactory<?, ?> byteBufferFactory;
     private final ApacheServletConfiguration configuration;
+    private SessionInputBuffer sessionInputBuffer;
 
     /**
      * Default constructor.
@@ -82,14 +85,20 @@ protected void handleSingleRequest(
     ) throws IOException {
         ApacheServletHttpResponse<?> response = new ApacheServletHttpResponse<>(conversionService);
         try {
+            // The buffer is initialized only once
+            if (sessionInputBuffer == null) {
+                sessionInputBuffer = new SessionInputBufferImpl(configuration.inputBufferSize());
+            }
             ApacheServletHttpRequest exchange = new ApacheServletHttpRequest<>(
-                in, conversionService, codecRegistry, ioExecutor, byteBufferFactory, response, configuration
+                in, sessionInputBuffer, conversionService, codecRegistry, ioExecutor, byteBufferFactory, response, configuration
             );
             servletHttpHandler.service(exchange);
         } catch (ApacheServletBadRequestException e) {
             response.status(HttpStatus.BAD_REQUEST);
             response.contentType(MediaType.TEXT_PLAIN_TYPE);
             response.getOutputStream().write(e.getMessage().getBytes());
+            writeResponse(response.getNativeResponse(), out);
+            throw e;
         }
         writeResponse(response.getNativeResponse(), out);
     }

http-poja-apache/src/main/java/io/micronaut/http/poja/apache/ApacheServletHttpRequest.java

@@ -31,6 +31,7 @@
 import io.micronaut.http.cookie.Cookies;
 import io.micronaut.http.poja.PojaHttpRequest;
 import io.micronaut.http.poja.apache.exception.ApacheServletBadRequestException;
+import io.micronaut.http.poja.exception.NoPojaRequestException;
 import io.micronaut.http.poja.util.MultiValueHeaders;
 import io.micronaut.http.poja.util.MultiValuesQueryParameters;
 import io.micronaut.http.simple.cookies.SimpleCookies;
@@ -42,7 +43,7 @@
 import org.apache.hc.core5.http.impl.io.ChunkedInputStream;
 import org.apache.hc.core5.http.impl.io.ContentLengthInputStream;
 import org.apache.hc.core5.http.impl.io.DefaultHttpRequestParser;
-import org.apache.hc.core5.http.impl.io.SessionInputBufferImpl;
+import org.apache.hc.core5.http.io.SessionInputBuffer;
 import org.apache.hc.core5.http.io.entity.EmptyInputStream;
 import org.apache.hc.core5.net.URIBuilder;
 
@@ -94,6 +95,7 @@ public final class ApacheServletHttpRequest<B> extends PojaHttpRequest<B, Classi
      */
     public ApacheServletHttpRequest(
         InputStream inputStream,
+        SessionInputBuffer sessionInputBuffer,
         ConversionService conversionService,
         MediaTypeCodecRegistry codecRegistry,
         ExecutorService ioExecutor,
@@ -102,16 +104,16 @@ public ApacheServletHttpRequest(
         ApacheServletConfiguration configuration
     ) {
         super(conversionService, codecRegistry, response);
-
-        SessionInputBufferImpl sessionInputBuffer
-            = new SessionInputBufferImpl(configuration.inputBufferSize());
         DefaultHttpRequestParser parser = new DefaultHttpRequestParser();
 
         try {
             request = parser.parse(sessionInputBuffer, inputStream);
         } catch (HttpException | IOException e) {
             throw new ApacheServletBadRequestException("HTTP request could not be parsed", e);
         }
+        if (request == null) {
+            throw new NoPojaRequestException();
+        }
 
         method = HttpMethod.parse(request.getMethod());
         try {
@@ -140,7 +142,7 @@ public ApacheServletHttpRequest(
      * @param sessionInputBuffer The input buffer
      * @return The body stream
      */
-    private InputStream createBodyStream(InputStream inputStream, long contentLength, SessionInputBufferImpl sessionInputBuffer) {
+    private InputStream createBodyStream(InputStream inputStream, long contentLength, SessionInputBuffer sessionInputBuffer) {
         InputStream bodyStream;
         if (contentLength > 0) {
             bodyStream = new ContentLengthInputStream(sessionInputBuffer, inputStream, contentLength);

http-poja-apache/src/test/groovy/io/micronaut/http/poja/SimpleServerFailedParseSpec.groovy

@@ -0,0 +1,32 @@
+package io.micronaut.http.poja
+
+import io.micronaut.test.extensions.spock.annotation.MicronautTest
+import jakarta.inject.Inject
+import spock.lang.Specification
+import spock.lang.Stepwise
+
+@Stepwise
+@MicronautTest
+class SimpleServerFailedParseSpec extends Specification {
+
+    @Inject
+    SimpleServerSpec.StringTestingClient client
+
+    void "test non-parseable GET method"() {
+        when:
+        var response = client.exchange(SimpleServerSpec.unindent("""
+        GET /test HTTP/1.1error\r
+        Host: h\r
+        \r
+        """))
+
+        then:
+        response == SimpleServerSpec.unindent("""
+        HTTP/1.1 400 Bad Request\r
+        Content-Length: 32\r
+        Content-Type: text/plain\r
+        \r
+        HTTP request could not be parsed""")
+    }
+
+}

http-poja-apache/src/test/groovy/io/micronaut/http/poja/SimpleServerSpec.groovy

@@ -54,23 +54,6 @@ class SimpleServerSpec extends Specification {
         {"_links":{"self":[{"href":"/invalid-test","templated":false}]},"_embedded":{"errors":[{"message":"Page Not Found"}]},"message":"Not Found"}""")
     }
 
-    void "test non-parseable GET method"() {
-        when:
-        var response = client.exchange(unindent("""
-        GET /test HTTP/1.1error\r
-        Host: h\r
-        \r
-        """))
-
-        then:
-        response == unindent("""
-        HTTP/1.1 400 Bad Request\r
-        Content-Length: 32\r
-        Content-Type: text/plain\r
-        \r
-        HTTP request could not be parsed""")
-    }
-
     void "test DELETE method"() {
         when:
         var response = client.exchange(unindent("""
@@ -153,7 +136,7 @@ class SimpleServerSpec extends Specification {
 
     }
 
-    private String unindent(String value, int indentSpaces = 8) {
+    static String unindent(String value, int indentSpaces = 8) {
         while (value.charAt(0) == '\n' as char) {
             value = value.substring(1)
         }

http-poja-common/src/main/java/io/micronaut/http/poja/PojaHttpServerlessApplication.java

@@ -17,6 +17,7 @@
 
 import io.micronaut.context.ApplicationContext;
 import io.micronaut.core.annotation.NonNull;
+import io.micronaut.http.poja.exception.NoPojaRequestException;
 import io.micronaut.runtime.ApplicationConfiguration;
 import io.micronaut.runtime.EmbeddedApplication;
 import io.micronaut.servlet.http.ServletExchange;
@@ -90,6 +91,9 @@ protected ServletExchange<REQ, RES> createExchange(Object request, Object respon
             runIndefinitely(servletHttpHandler, input, output);
         } catch (IOException e) {
             throw new RuntimeException(e);
+        } catch (NoPojaRequestException e) {
+            this.stop();
+            Thread.currentThread().interrupt();
         }
         return this;
     }
@@ -112,7 +116,7 @@ protected ServletExchange<REQ, RES> createExchange(Object request, Object respon
                 return start(System.in, System.out);
             }
         } catch (IOException e) {
-            throw new RuntimeException();
+            throw new RuntimeException(e);
         }
     }
 

http-poja-common/src/main/java/io/micronaut/http/poja/exception/NoPojaRequestException.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2017-2024 original authors
+ *
+ * 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
+ *
+ * https://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.micronaut.http.poja.exception;
+
+/**
+ * An exception to be thrown when no additional requests can be parsed.
+ * This can happen if the input stream is closed when waiting for a new request.
+ * This is not an error condition, therefore application can simply stop.
+ */
+public class NoPojaRequestException extends RuntimeException {
+
+    /**
+     * Constructor for the exception.
+     */
+    public NoPojaRequestException() {
+        super("No new request was found in the input stream");
+    }
+
+}

test-sample-poja/README.md

@@ -37,3 +37,8 @@ Hello, Micronaut Without Netty!
 
 ```
 
+Alternatively redirect the input from a file:
+```shell
+gradle :micronaut-test-sample-poja:run --console=plain <test-sample-poja/test-request.txt
+```
+

test-sample-poja/build.gradle

@@ -46,6 +46,7 @@ graalvmNative {
     binaries.all {
         buildArgs.add("--gc=serial")
         buildArgs.add("--install-exit-handlers")
+        buildArgs.add("-Ob")
     }
 }
 

test-sample-poja/src/main/java/io/micronaut/http/poja/sample/Application.java

@@ -15,6 +15,7 @@
  */
 package io.micronaut.http.poja.sample;
 
+import io.micronaut.context.ApplicationContext;
 import io.micronaut.runtime.Micronaut;
 
 /**
@@ -26,7 +27,8 @@
 public class Application {
 
     public static void main(String[] args) {
-        Micronaut.run(Application.class, args);
+        ApplicationContext context = Micronaut.run(Application.class, args);
+        context.stop();
     }
 
 }

test-sample-poja/src/test/java/io/micronaut/http/poja/sample/SimpleServerTest.java

@@ -19,7 +19,7 @@
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 @MicronautTest
-@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
+@TestMethodOrder(MethodOrderer.MethodName.class)
 public class SimpleServerTest {
 
     @Inject

test-sample-poja/test-request.txt

@@ -0,0 +1,3 @@
+GET / HTTP/1.1
+Content-Length: 0
+