1 /*
2 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.incubator.http;
27
28 import java.lang.System.Logger.Level;
29 import java.net.InetSocketAddress;
30 import java.net.URI;
31 import java.util.Base64;
32 import java.util.Collections;
33 import java.util.HashSet;
34 import java.util.HashMap;
35 import java.util.Map;
36 import java.util.Set;
37 import java.util.concurrent.ConcurrentHashMap;
38 import java.util.concurrent.CompletableFuture;
39 import jdk.incubator.http.internal.common.MinimalFuture;
40 import jdk.incubator.http.internal.common.Utils;
41 import jdk.incubator.http.internal.frame.SettingsFrame;
42 import static jdk.incubator.http.internal.frame.SettingsFrame.INITIAL_WINDOW_SIZE;
43 import static jdk.incubator.http.internal.frame.SettingsFrame.ENABLE_PUSH;
44 import static jdk.incubator.http.internal.frame.SettingsFrame.HEADER_TABLE_SIZE;
45 import static jdk.incubator.http.internal.frame.SettingsFrame.MAX_CONCURRENT_STREAMS;
46 import static jdk.incubator.http.internal.frame.SettingsFrame.MAX_FRAME_SIZE;
47
48 /**
49 * Http2 specific aspects of HttpClientImpl
50 */
51 class Http2ClientImpl {
52
53 static final boolean DEBUG = Utils.DEBUG; // Revisit: temporary dev flag.
54 final static System.Logger debug =
55 Utils.getDebugLogger("Http2ClientImpl"::toString, DEBUG);
56
57 private final HttpClientImpl client;
58
59 Http2ClientImpl(HttpClientImpl client) {
60 this.client = client;
61 }
62
63 /* Map key is "scheme:host:port" */
64 private final Map<String,Http2Connection> connections = new ConcurrentHashMap<>();
65
66 private final Set<String> opening = Collections.synchronizedSet(new HashSet<>());
67 private final Map<String,Set<CompletableFuture<Http2Connection>>> waiting =
68 Collections.synchronizedMap(new HashMap<>());
69
70 private void addToWaiting(String key, CompletableFuture<Http2Connection> cf) {
71 synchronized (waiting) {
72 Set<CompletableFuture<Http2Connection>> waiters = waiting.get(key);
73 if (waiters == null) {
74 waiters = new HashSet<>();
75 waiting.put(key, waiters);
76 }
77 waiters.add(cf);
78 }
79 }
80
81 // boolean haveConnectionFor(URI uri, InetSocketAddress proxy) {
82 // return connections.containsKey(Http2Connection.keyFor(uri,proxy));
83 // }
84
85 /**
86 * If a https request then async waits until a connection is opened.
87 * Returns null if the request is 'http' as a different (upgrade)
88 * mechanism is used.
89 *
90 * Only one connection per destination is created. Blocks when opening
91 * connection, or when waiting for connection to be opened.
92 * First thread opens the connection and notifies the others when done.
93 *
94 * If the request is secure (https) then we open the connection here.
95 * If not, then the more complicated upgrade from 1.1 to 2 happens (not here)
96 * In latter case, when the Http2Connection is connected, putConnection() must
97 * be called to store it.
98 */
99 CompletableFuture<Http2Connection> getConnectionFor(HttpRequestImpl req) {
100 URI uri = req.uri();
101 InetSocketAddress proxy = req.proxy();
102 String key = Http2Connection.keyFor(uri, proxy);
103
104 synchronized (opening) {
105 Http2Connection connection = connections.get(key);
106 if (connection != null) { // fast path if connection already exists
107 return CompletableFuture.completedFuture(connection);
108 }
109
110 if (!req.secure()) {
111 return MinimalFuture.completedFuture(null);
112 }
113
114 if (!opening.contains(key)) {
115 debug.log(Level.DEBUG, "Opening: %s", key);
116 opening.add(key);
117 } else {
118 CompletableFuture<Http2Connection> cf = new MinimalFuture<>();
119 addToWaiting(key, cf);
120 return cf;
121 }
122 }
123 return Http2Connection
124 .createAsync(req, this)
125 .whenComplete((conn, t) -> {
126 debug.log(Level.DEBUG,
127 "waking up dependents with created connection");
128 synchronized (opening) {
129 Set<CompletableFuture<Http2Connection>> waiters = waiting.remove(key);
130 debug.log(Level.DEBUG, "Opening completed: %s", key);
131 opening.remove(key);
132 final Throwable cause = Utils.getCompletionCause(t);
133 if (waiters == null) {
134 debug.log(Level.DEBUG, "no dependent to wake up");
135 return;
136 } else if (cause instanceof Http2Connection.ALPNException) {
137 waiters.forEach((cf1) -> cf1.completeAsync(() -> null,
138 client.theExecutor()));
139 } else if (cause != null) {
140 debug.log(Level.DEBUG,
141 () -> "waking up dependants: failed: " + cause);
142 waiters.forEach((cf1) -> cf1.completeExceptionally(cause));
143 } else {
144 debug.log(Level.DEBUG, "waking up dependants: succeeded");
145 waiters.forEach((cf1) -> cf1.completeAsync(() -> conn,
146 client.theExecutor()));
147 }
148 }
149 });
150 }
151
152 /*
153 * TODO: If there isn't a connection to the same destination, then
154 * store it. If there is already a connection, then close it
155 */
156 void putConnection(Http2Connection c) {
157 connections.put(c.key(), c);
158 }
159
160 void deleteConnection(Http2Connection c) {
161 connections.remove(c.key());
162 }
163
164 void stop() {
165 debug.log(Level.DEBUG, "stopping");
166 connections.values().forEach(this::close);
167 connections.clear();
168 }
169
170 private void close(Http2Connection h2c) {
171 try { h2c.close(); } catch (Throwable t) {}
172 }
173
174 HttpClientImpl client() {
175 return client;
176 }
177
178 /** Returns the client settings as a base64 (url) encoded string */
179 String getSettingsString() {
180 SettingsFrame sf = getClientSettings();
181 byte[] settings = sf.toByteArray(); // without the header
182 Base64.Encoder encoder = Base64.getUrlEncoder()
183 .withoutPadding();
184 return encoder.encodeToString(settings);
185 }
186
187 private static final int K = 1024;
188
189 SettingsFrame getClientSettings() {
190 SettingsFrame frame = new SettingsFrame();
191 frame.setParameter(HEADER_TABLE_SIZE, Utils.getIntegerNetProperty(
192 "jdk.httpclient.hpack.maxheadertablesize", 16 * K));
193 frame.setParameter(ENABLE_PUSH, Utils.getIntegerNetProperty(
194 "jdk.httpclient.enablepush", 1));
195 frame.setParameter(MAX_CONCURRENT_STREAMS, Utils.getIntegerNetProperty(
196 "jdk.httpclient.maxstreams", 16));
197 frame.setParameter(INITIAL_WINDOW_SIZE, Utils.getIntegerNetProperty(
198 "jdk.httpclient.windowsize", 64 * K - 1));
199 frame.setParameter(MAX_FRAME_SIZE, Utils.getIntegerNetProperty(
200 "jdk.httpclient.maxframesize", 16 * K));
201 return frame;
202 }
203 }