src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/internal/Http1Response.java
branchhttp-client-branch
changeset 56079 d23b02f37fce
parent 55973 4d9b002587db
child 56082 1da51fab3032
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/internal/Http1Response.java	Tue Feb 06 14:10:28 2018 +0000
@@ -0,0 +1,518 @@
+/*
+ * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.incubator.http.internal;
+
+import java.io.EOFException;
+import java.lang.System.Logger.Level;
+import java.nio.ByteBuffer;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionStage;
+import java.util.concurrent.Executor;
+import java.util.function.BiConsumer;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import jdk.incubator.http.HttpHeaders;
+import jdk.incubator.http.HttpResponse;
+import jdk.incubator.http.internal.ResponseContent.BodyParser;
+import jdk.incubator.http.internal.common.Log;
+import jdk.incubator.http.internal.common.MinimalFuture;
+import jdk.incubator.http.internal.common.Utils;
+import static jdk.incubator.http.HttpClient.Version.HTTP_1_1;
+
+/**
+ * Handles a HTTP/1.1 response (headers + body).
+ * There can be more than one of these per Http exchange.
+ */
+class Http1Response<T> {
+
+    private volatile ResponseContent content;
+    private final HttpRequestImpl request;
+    private Response response;
+    private final HttpConnection connection;
+    private HttpHeaders headers;
+    private int responseCode;
+    private final Http1Exchange<T> exchange;
+    private boolean return2Cache; // return connection to cache when finished
+    private final HeadersReader headersReader; // used to read the headers
+    private final BodyReader bodyReader; // used to read the body
+    private final Http1AsyncReceiver asyncReceiver;
+    private volatile EOFException eof;
+    // max number of bytes of (fixed length) body to ignore on redirect
+    private final static int MAX_IGNORE = 1024;
+
+    // Revisit: can we get rid of this?
+    static enum State {INITIAL, READING_HEADERS, READING_BODY, DONE}
+    private volatile State readProgress = State.INITIAL;
+    static final boolean DEBUG = Utils.DEBUG; // Revisit: temporary dev flag.
+    final System.Logger  debug = Utils.getDebugLogger(this.getClass()::getSimpleName, DEBUG);
+
+
+    Http1Response(HttpConnection conn,
+                  Http1Exchange<T> exchange,
+                  Http1AsyncReceiver asyncReceiver) {
+        this.readProgress = State.INITIAL;
+        this.request = exchange.request();
+        this.exchange = exchange;
+        this.connection = conn;
+        this.asyncReceiver = asyncReceiver;
+        headersReader = new HeadersReader(this::advance);
+        bodyReader = new BodyReader(this::advance);
+    }
+
+   public CompletableFuture<Response> readHeadersAsync(Executor executor) {
+        debug.log(Level.DEBUG, () -> "Reading Headers: (remaining: "
+                + asyncReceiver.remaining() +") "  + readProgress);
+        // with expect continue we will resume reading headers + body.
+        asyncReceiver.unsubscribe(bodyReader);
+        bodyReader.reset();
+        Http1HeaderParser hd = new Http1HeaderParser();
+        readProgress = State.READING_HEADERS;
+        headersReader.start(hd);
+        asyncReceiver.subscribe(headersReader);
+        CompletableFuture<State> cf = headersReader.completion();
+        assert cf != null : "parsing not started";
+
+        Function<State, Response> lambda = (State completed) -> {
+                assert completed == State.READING_HEADERS;
+                debug.log(Level.DEBUG, () ->
+                            "Reading Headers: creating Response object;"
+                            + " state is now " + readProgress);
+                asyncReceiver.unsubscribe(headersReader);
+                responseCode = hd.responseCode();
+                headers = hd.headers();
+
+                response = new Response(request,
+                                        exchange.getExchange(),
+                                        headers,
+                                        responseCode,
+                                        HTTP_1_1);
+                return response;
+            };
+
+        if (executor != null) {
+            return cf.thenApplyAsync(lambda, executor);
+        } else {
+            return cf.thenApply(lambda);
+        }
+    }
+
+    private boolean finished;
+
+    synchronized void completed() {
+        finished = true;
+    }
+
+    synchronized boolean finished() {
+        return finished;
+    }
+
+    int fixupContentLen(int clen) {
+        if (request.method().equalsIgnoreCase("HEAD")) {
+            return 0;
+        }
+        if (clen == -1) {
+            if (headers.firstValue("Transfer-encoding").orElse("")
+                       .equalsIgnoreCase("chunked")) {
+                return -1;
+            }
+            return 0;
+        }
+        return clen;
+    }
+
+    /**
+     * Read up to MAX_IGNORE bytes discarding
+     */
+    public CompletableFuture<Void> ignoreBody(Executor executor) {
+        int clen = (int)headers.firstValueAsLong("Content-Length").orElse(-1);
+        if (clen == -1 || clen > MAX_IGNORE) {
+            connection.close();
+            return MinimalFuture.completedFuture(null); // not treating as error
+        } else {
+            return readBody(HttpResponse.BodySubscriber.discard((Void)null), true, executor);
+        }
+    }
+
+    public <U> CompletableFuture<U> readBody(HttpResponse.BodySubscriber<U> p,
+                                         boolean return2Cache,
+                                         Executor executor) {
+        this.return2Cache = return2Cache;
+        final HttpResponse.BodySubscriber<U> pusher = p;
+        final CompletionStage<U> bodyCF = p.getBody();
+        final CompletableFuture<U> cf = MinimalFuture.of(bodyCF);
+
+        int clen0 = (int)headers.firstValueAsLong("Content-Length").orElse(-1);
+
+        final int clen = fixupContentLen(clen0);
+
+        // expect-continue reads headers and body twice.
+        // if we reach here, we must reset the headersReader state.
+        asyncReceiver.unsubscribe(headersReader);
+        headersReader.reset();
+
+        executor.execute(() -> {
+            try {
+                HttpClientImpl client = connection.client();
+                content = new ResponseContent(
+                        connection, clen, headers, pusher,
+                        this::onFinished
+                );
+                if (cf.isCompletedExceptionally()) {
+                    // if an error occurs during subscription
+                    connection.close();
+                    return;
+                }
+                // increment the reference count on the HttpClientImpl
+                // to prevent the SelectorManager thread from exiting until
+                // the body is fully read.
+                client.reference();
+                bodyReader.start(content.getBodyParser(
+                    (t) -> {
+                        try {
+                            if (t != null) {
+                                pusher.onError(t);
+                                connection.close();
+                                if (!cf.isDone())
+                                    cf.completeExceptionally(t);
+                            }
+                        } finally {
+                            // decrement the reference count on the HttpClientImpl
+                            // to allow the SelectorManager thread to exit if no
+                            // other operation is pending and the facade is no
+                            // longer referenced.
+                            client.unreference();
+                            bodyReader.onComplete(t);
+                        }
+                    }));
+                CompletableFuture<State> bodyReaderCF = bodyReader.completion();
+                asyncReceiver.subscribe(bodyReader);
+                assert bodyReaderCF != null : "parsing not started";
+                // Make sure to keep a reference to asyncReceiver from
+                // within this
+                CompletableFuture<?> trailingOp = bodyReaderCF.whenComplete((s,t) ->  {
+                    t = Utils.getCompletionCause(t);
+                    try {
+                        if (t != null) {
+                            debug.log(Level.DEBUG, () ->
+                                    "Finished reading body: " + s);
+                            assert s == State.READING_BODY;
+                        }
+                        if (t != null && !cf.isDone()) {
+                            pusher.onError(t);
+                            cf.completeExceptionally(t);
+                        }
+                    } catch (Throwable x) {
+                        // not supposed to happen
+                        asyncReceiver.onReadError(x);
+                    }
+                });
+                connection.addTrailingOperation(trailingOp);
+            } catch (Throwable t) {
+               debug.log(Level.DEBUG, () -> "Failed reading body: " + t);
+                try {
+                    if (!cf.isDone()) {
+                        pusher.onError(t);
+                        cf.completeExceptionally(t);
+                    }
+                } finally {
+                    asyncReceiver.onReadError(t);
+                }
+            }
+        });
+        return cf;
+    }
+
+
+    private void onFinished() {
+        asyncReceiver.clear();
+        if (return2Cache) {
+            Log.logTrace("Attempting to return connection to the pool: {0}", connection);
+            // TODO: need to do something here?
+            // connection.setAsyncCallbacks(null, null, null);
+
+            // don't return the connection to the cache if EOF happened.
+            debug.log(Level.DEBUG, () -> connection.getConnectionFlow()
+                                   + ": return to HTTP/1.1 pool");
+            connection.closeOrReturnToCache(eof == null ? headers : null);
+        }
+    }
+
+    HttpHeaders responseHeaders() {
+        return headers;
+    }
+
+    int responseCode() {
+        return responseCode;
+    }
+
+// ================ Support for plugging into Http1Receiver   =================
+// ============================================================================
+
+    // Callback: Error receiver: Consumer of Throwable.
+    void onReadError(Throwable t) {
+        Log.logError(t);
+        Receiver<?> receiver = receiver(readProgress);
+        if (t instanceof EOFException) {
+            debug.log(Level.DEBUG, "onReadError: received EOF");
+            eof = (EOFException) t;
+        }
+        CompletableFuture<?> cf = receiver == null ? null : receiver.completion();
+        debug.log(Level.DEBUG, () -> "onReadError: cf is "
+                + (cf == null  ? "null"
+                : (cf.isDone() ? "already completed"
+                               : "not yet completed")));
+        if (cf != null && !cf.isDone()) cf.completeExceptionally(t);
+        else { debug.log(Level.DEBUG, "onReadError", t); }
+        debug.log(Level.DEBUG, () -> "closing connection: cause is " + t);
+        connection.close();
+    }
+
+    // ========================================================================
+
+    private State advance(State previous) {
+        assert readProgress == previous;
+        switch(previous) {
+            case READING_HEADERS:
+                asyncReceiver.unsubscribe(headersReader);
+                return readProgress = State.READING_BODY;
+            case READING_BODY:
+                asyncReceiver.unsubscribe(bodyReader);
+                return readProgress = State.DONE;
+            default:
+                throw new InternalError("can't advance from " + previous);
+        }
+    }
+
+    Receiver<?> receiver(State state) {
+        switch(state) {
+            case READING_HEADERS: return headersReader;
+            case READING_BODY: return bodyReader;
+            default: return null;
+        }
+
+    }
+
+    static abstract class Receiver<T>
+            implements Http1AsyncReceiver.Http1AsyncDelegate {
+        abstract void start(T parser);
+        abstract CompletableFuture<State> completion();
+        // accepts a buffer from upstream.
+        // this should be implemented as a simple call to
+        // accept(ref, parser, cf)
+        public abstract boolean tryAsyncReceive(ByteBuffer buffer);
+        public abstract void onReadError(Throwable t);
+        // handle a byte buffer received from upstream.
+        // this method should set the value of Http1Response.buffer
+        // to ref.get() before beginning parsing.
+        abstract void handle(ByteBuffer buf, T parser,
+                             CompletableFuture<State> cf);
+        // resets this objects state so that it can be reused later on
+        // typically puts the reference to parser and completion to null
+        abstract void reset();
+
+        // accepts a byte buffer received from upstream
+        // returns true if the buffer is fully parsed and more data can
+        // be accepted, false otherwise.
+        final boolean accept(ByteBuffer buf, T parser,
+                CompletableFuture<State> cf) {
+            if (cf == null || parser == null || cf.isDone()) return false;
+            handle(buf, parser, cf);
+            return !cf.isDone();
+        }
+        public abstract void onSubscribe(AbstractSubscription s);
+        public abstract AbstractSubscription subscription();
+
+    }
+
+    // Invoked with each new ByteBuffer when reading headers...
+    final class HeadersReader extends Receiver<Http1HeaderParser> {
+        final Consumer<State> onComplete;
+        volatile Http1HeaderParser parser;
+        volatile CompletableFuture<State> cf;
+        volatile long count; // bytes parsed (for debug)
+        volatile AbstractSubscription subscription;
+
+        HeadersReader(Consumer<State> onComplete) {
+            this.onComplete = onComplete;
+        }
+
+        @Override
+        public AbstractSubscription subscription() {
+            return subscription;
+        }
+
+        @Override
+        public void onSubscribe(AbstractSubscription s) {
+            this.subscription = s;
+            s.request(1);
+        }
+
+        @Override
+        void reset() {
+            cf = null;
+            parser = null;
+            count = 0;
+            subscription = null;
+        }
+
+        // Revisit: do we need to support restarting?
+        @Override
+        final void start(Http1HeaderParser hp) {
+            count = 0;
+            cf = new MinimalFuture<>();
+            parser = hp;
+        }
+
+        @Override
+        CompletableFuture<State> completion() {
+            return cf;
+        }
+
+        @Override
+        public final boolean tryAsyncReceive(ByteBuffer ref) {
+            boolean hasDemand = subscription.demand().tryDecrement();
+            assert hasDemand;
+            boolean needsMore = accept(ref, parser, cf);
+            if (needsMore) subscription.request(1);
+            return needsMore;
+        }
+
+        @Override
+        public final void onReadError(Throwable t) {
+            Http1Response.this.onReadError(t);
+        }
+
+        @Override
+        final void handle(ByteBuffer b,
+                          Http1HeaderParser parser,
+                          CompletableFuture<State> cf) {
+            assert cf != null : "parsing not started";
+            assert parser != null : "no parser";
+            try {
+                count += b.remaining();
+                debug.log(Level.DEBUG, () -> "Sending " + b.remaining()
+                        + "/" + b.capacity() + " bytes to header parser");
+                if (parser.parse(b)) {
+                    count -= b.remaining();
+                    debug.log(Level.DEBUG, () ->
+                            "Parsing headers completed. bytes=" + count);
+                    onComplete.accept(State.READING_HEADERS);
+                    cf.complete(State.READING_HEADERS);
+                }
+            } catch (Throwable t) {
+                debug.log(Level.DEBUG,
+                        () -> "Header parser failed to handle buffer: " + t);
+                cf.completeExceptionally(t);
+            }
+        }
+    }
+
+    // Invoked with each new ByteBuffer when reading bodies...
+    final class BodyReader extends Receiver<BodyParser> {
+        final Consumer<State> onComplete;
+        volatile BodyParser parser;
+        volatile CompletableFuture<State> cf;
+        volatile AbstractSubscription subscription;
+        BodyReader(Consumer<State> onComplete) {
+            this.onComplete = onComplete;
+        }
+
+        @Override
+        void reset() {
+            parser = null;
+            cf = null;
+            subscription = null;
+        }
+
+        // Revisit: do we need to support restarting?
+        @Override
+        final void start(BodyParser parser) {
+            cf = new MinimalFuture<>();
+            this.parser = parser;
+        }
+
+        @Override
+        CompletableFuture<State> completion() {
+            return cf;
+        }
+
+        @Override
+        public final boolean tryAsyncReceive(ByteBuffer b) {
+            return accept(b, parser, cf);
+        }
+
+        @Override
+        public final void onReadError(Throwable t) {
+            Http1Response.this.onReadError(t);
+        }
+
+        @Override
+        public AbstractSubscription subscription() {
+            return subscription;
+        }
+
+        @Override
+        public void onSubscribe(AbstractSubscription s) {
+            this.subscription = s;
+            parser.onSubscribe(s);
+        }
+
+        @Override
+        final void handle(ByteBuffer b,
+                          BodyParser parser,
+                          CompletableFuture<State> cf) {
+            assert cf != null : "parsing not started";
+            assert parser != null : "no parser";
+            try {
+                debug.log(Level.DEBUG, () -> "Sending " + b.remaining()
+                        + "/" + b.capacity() + " bytes to body parser");
+                parser.accept(b);
+            } catch (Throwable t) {
+                debug.log(Level.DEBUG,
+                        () -> "Body parser failed to handle buffer: " + t);
+                if (!cf.isDone()) {
+                    cf.completeExceptionally(t);
+                }
+            }
+        }
+
+        final void onComplete(Throwable closedExceptionally) {
+            if (cf.isDone()) return;
+            if (closedExceptionally != null) {
+                cf.completeExceptionally(closedExceptionally);
+            } else {
+                onComplete.accept(State.READING_BODY);
+                cf.complete(State.READING_BODY);
+            }
+        }
+
+        @Override
+        public String toString() {
+            return super.toString() + "/parser=" + String.valueOf(parser);
+        }
+
+    }
+}