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1 files changed, 210 insertions, 0 deletions

diff --git a/jdisc_http_service/src/main/java/com/yahoo/jdisc/http/server/jetty/HttpRequestDispatch.java b/jdisc_http_service/src/main/java/com/yahoo/jdisc/http/server/jetty/HttpRequestDispatch.java
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+++ b/jdisc_http_service/src/main/java/com/yahoo/jdisc/http/server/jetty/HttpRequestDispatch.java
@@ -0,0 +1,210 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.jdisc.http.server.jetty;
+
+import com.yahoo.container.logging.AccessLogEntry;
+import com.yahoo.jdisc.Metric.Context;
+import com.yahoo.jdisc.References;
+import com.yahoo.jdisc.ResourceReference;
+import com.yahoo.jdisc.Response;
+import com.yahoo.jdisc.handler.BindingNotFoundException;
+import com.yahoo.jdisc.handler.ContentChannel;
+import com.yahoo.jdisc.handler.OverloadException;
+import com.yahoo.jdisc.handler.RequestHandler;
+import com.yahoo.jdisc.http.HttpHeaders;
+import com.yahoo.jdisc.http.HttpRequest;
+
+import javax.servlet.AsyncContext;
+import javax.servlet.ServletInputStream;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.function.BiConsumer;
+import java.util.function.Consumer;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import static com.yahoo.jdisc.http.HttpHeaders.Values.APPLICATION_X_WWW_FORM_URLENCODED;
+import static com.yahoo.jdisc.http.server.jetty.Exceptions.throwUnchecked;
+
+/**
+ * @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen Hult</a>
+ */
+class HttpRequestDispatch {
+    private static final Logger log = Logger.getLogger(HttpRequestDispatch.class.getName());
+
+    private final static String CHARSET_ANNOTATION = ";charset=";
+
+    private final JDiscContext jDiscContext;
+    private final AsyncContext async;
+    private final HttpServletRequest servletRequest;
+
+    private final ServletResponseController servletResponseController;
+    private final RequestHandler requestHandler;
+    private final MetricReporter metricReporter;
+
+    public HttpRequestDispatch(
+            final JDiscContext jDiscContext,
+            final AccessLogEntry accessLogEntry,
+            final Context metricContext,
+            final HttpServletRequest servletRequest,
+            final HttpServletResponse servletResponse) throws IOException {
+        this.jDiscContext = jDiscContext;
+
+        requestHandler = newRequestHandler(jDiscContext, accessLogEntry, servletRequest);
+
+        this.metricReporter = new MetricReporter(jDiscContext.metric, metricContext,
+                ((org.eclipse.jetty.server.Request) servletRequest).getTimeStamp());
+        this.servletRequest = servletRequest;
+
+        this.servletResponseController = new ServletResponseController(
+                servletResponse,
+                jDiscContext.janitor,
+                metricReporter,
+                jDiscContext.developerMode());
+
+        this.async = servletRequest.startAsync();
+        async.setTimeout(0);
+    }
+
+    public void dispatch() throws IOException {
+        final ServletRequestReader servletRequestReader;
+        try {
+            servletRequestReader = handleRequest();
+        } catch (Throwable throwable) {
+            servletResponseController.trySendError(throwable);
+            servletResponseController.finishedFuture().whenComplete((result, exception) ->
+                    completeRequestCallback.accept(null, throwable));
+            return;
+        }
+
+        try {
+            onError(servletRequestReader.finishedFuture,
+                    servletResponseController::trySendError);
+
+            onError(servletResponseController.finishedFuture(),
+                    servletRequestReader::onError);
+
+            CompletableFuture.allOf(servletRequestReader.finishedFuture, servletResponseController.finishedFuture())
+                    .whenComplete(completeRequestCallback);
+        } catch (Throwable throwable) {
+            log.log(Level.WARNING, "Failed registering finished listeners.", throwable);
+        }
+    }
+
+    private BiConsumer<Void, Throwable> completeRequestCallback;
+    {
+        AtomicBoolean completeRequestCalled = new AtomicBoolean(false);
+        HttpRequestDispatch parent = this; //used to avoid binding uninitialized variables
+
+        completeRequestCallback = (result, error) -> {
+            boolean reportedError = false;
+
+            if (error != null) {
+                if (!(error instanceof OverloadException || error instanceof BindingNotFoundException)) {
+                    log.log(Level.WARNING, "Request failed: " + parent.servletRequest.getRequestURI(), error);
+                }
+                reportedError = true;
+                parent.metricReporter.failedResponse();
+            } else {
+                parent.metricReporter.successfulResponse();
+            }
+
+
+            boolean alreadyCalled = completeRequestCalled.getAndSet(true);
+            if (alreadyCalled) {
+                AssertionError e = new AssertionError("completeRequest called more than once");
+                log.log(Level.WARNING, "Assertion failed.", e);
+                throw e;
+            }
+
+            try {
+                parent.async.complete();
+                log.finest(() -> "Request completed successfully: " + parent.servletRequest.getRequestURI());
+            } catch (Throwable throwable) {
+                Level level = reportedError ? Level.FINE: Level.WARNING;
+                log.log(level, "async.complete failed", throwable);
+            }
+        };
+    }
+
+    private ServletRequestReader handleRequest() throws IOException {
+        HttpRequest jdiscRequest = HttpRequestFactory.newJDiscRequest(jDiscContext.container, servletRequest);
+        final ContentChannel requestContentChannel;
+
+        try (ResourceReference ref = References.fromResource(jdiscRequest)) {
+            HttpRequestFactory.copyHeaders(servletRequest, jdiscRequest);
+            requestContentChannel = requestHandler.handleRequest(jdiscRequest, servletResponseController.responseHandler);
+        }
+
+        ServletInputStream servletInputStream = servletRequest.getInputStream();
+
+        ServletRequestReader servletRequestReader =
+                new ServletRequestReader(
+                        servletInputStream,
+                        requestContentChannel,
+                        jDiscContext.janitor,
+                        metricReporter);
+
+        servletInputStream.setReadListener(servletRequestReader);
+        return servletRequestReader;
+    }
+
+    private static void onError(CompletableFuture<?> future, Consumer<Throwable> errorHandler) {
+        future.whenComplete((result, exception) -> {
+            if (exception != null) {
+                errorHandler.accept(exception);
+            }
+        });
+    }
+
+    ContentChannel handleRequestFilterResponse(Response response) {
+        try {
+            servletRequest.getInputStream().close();
+            ContentChannel responseContentChannel = servletResponseController.responseHandler.handleResponse(response);
+            servletResponseController.finishedFuture().whenComplete(completeRequestCallback);
+            return responseContentChannel;
+        } catch (IOException e) {
+            throw throwUnchecked(e);
+        }
+    }
+
+
+    private static RequestHandler newRequestHandler(
+            final JDiscContext context,
+            final AccessLogEntry accessLogEntry,
+            final HttpServletRequest servletRequest) {
+        final RequestHandler requestHandler = wrapHandlerIfFormPost(
+                new FilteringRequestHandler(context.requestFilters, context.responseFilters),
+                servletRequest, context.serverConfig.removeRawPostBodyForWwwUrlEncodedPost());
+
+        return new AccessLoggingRequestHandler(requestHandler, accessLogEntry);
+    }
+
+    private static RequestHandler wrapHandlerIfFormPost(
+            final RequestHandler requestHandler,
+            final HttpServletRequest servletRequest,
+            final boolean removeBodyForFormPost) {
+        if (!servletRequest.getMethod().equals("POST")) {
+            return requestHandler;
+        }
+        final String contentType = servletRequest.getHeader(HttpHeaders.Names.CONTENT_TYPE);
+        if (contentType == null) {
+            return requestHandler;
+        }
+        if (!contentType.startsWith(APPLICATION_X_WWW_FORM_URLENCODED)) {
+            return requestHandler;
+        }
+        return new FormPostRequestHandler(requestHandler, getCharsetName(contentType), removeBodyForFormPost);
+    }
+
+    private static String getCharsetName(final String contentType) {
+        if (!contentType.startsWith(CHARSET_ANNOTATION, APPLICATION_X_WWW_FORM_URLENCODED.length())) {
+            return StandardCharsets.UTF_8.name();
+        }
+        return contentType.substring(APPLICATION_X_WWW_FORM_URLENCODED.length() + CHARSET_ANNOTATION.length());
+    }
+}