1 /*
2 * Copyright (c) 2015, 2016, 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 java.net.http;
27
28 import java.io.IOException;
29 import java.net.InetSocketAddress;
30 import java.net.URI;
31 import static java.net.http.SettingsFrame.INITIAL_WINDOW_SIZE;
32 import static java.net.http.SettingsFrame.ENABLE_PUSH;
33 import static java.net.http.SettingsFrame.HEADER_TABLE_SIZE;
34 import static java.net.http.SettingsFrame.MAX_CONCURRENT_STREAMS;
35 import static java.net.http.SettingsFrame.MAX_FRAME_SIZE;
36 import java.util.Base64;
37 import java.util.Collections;
38 import java.util.HashMap;
39 import java.util.HashSet;
40 import java.util.Map;
41 import java.util.Set;
42
43 /**
44 * Http2 specific aspects of HttpClientImpl
45 */
46 class Http2ClientImpl {
47
48 final private HttpClientImpl client;
49
50 Http2ClientImpl(HttpClientImpl client) {
51 this.client = client;
52 }
53
54 /* Map key is "scheme:host:port" */
55 final private Map<String,Http2Connection> connections =
56 Collections.synchronizedMap(new HashMap<>());
57
58 final private Set<String> opening = Collections.synchronizedSet(new HashSet<>());
59
60 synchronized boolean haveConnectionFor(URI uri, InetSocketAddress proxy) {
61 return connections.containsKey(Http2Connection.keyFor(uri,proxy));
62 }
63
64 /**
65 * If a https request then blocks and waits until a connection is opened.
66 * Returns null if the request is 'http' as a different (upgrade)
67 * mechanism is used.
68 *
69 * Only one connection per destination is created. Blocks when opening
70 * connection, or when waiting for connection to be opened.
71 * First thread opens the connection and notifies the others when done.
72 *
73 * If the request is secure (https) then we open the connection here.
74 * If not, then the more complicated upgrade from 1.1 to 2 happens (not here)
75 * In latter case, when the Http2Connection is connected, putConnection() must
76 * be called to store it.
77 */
78 Http2Connection getConnectionFor(HttpRequestImpl req)
79 throws IOException, InterruptedException {
80 URI uri = req.uri();
81 InetSocketAddress proxy = req.proxy();
82 String key = Http2Connection.keyFor(uri, proxy);
83 Http2Connection connection;
84 synchronized (opening) {
85 while ((connection = connections.get(key)) == null) {
86 if (!req.secure()) {
87 return null;
88 }
89 if (!opening.contains(key)) {
90 opening.add(key);
91 break;
92 } else {
93 opening.wait();
94 }
95 }
96 }
97 if (connection != null) {
98 return connection;
99 }
100 // we are opening the connection here blocking until it is done.
101 connection = new Http2Connection(req);
102 synchronized (opening) {
103 connections.put(key, connection);
104 opening.remove(key);
105 opening.notifyAll();
106 }
107 return connection;
108 }
109
110
111 /*
112 * TODO: If there isn't a connection to the same destination, then
113 * store it. If there is already a connection, then close it
114 */
115 synchronized void putConnection(Http2Connection c) {
116 String key = c.key();
117 connections.put(key, c);
118 }
119
120 synchronized void deleteConnection(Http2Connection c) {
121 String key = c.key();
122 connections.remove(key);
123 }
124
125 HttpClientImpl client() {
126 return client;
127 }
128
129 /** Returns the client settings as a base64 (url) encoded string */
130 String getSettingsString() {
131 SettingsFrame sf = getClientSettings();
132 ByteBufferGenerator bg = new ByteBufferGenerator(client);
133 sf.writeOutgoing(bg);
134 byte[] settings = bg.asByteArray(9); // without the header
135 Base64.Encoder encoder = Base64.getUrlEncoder()
136 .withoutPadding();
137 return encoder.encodeToString(settings);
138 }
139
140 private static final int K = 1024;
141
142 SettingsFrame getClientSettings() {
143 SettingsFrame frame = new SettingsFrame();
144 frame.setParameter(HEADER_TABLE_SIZE, Utils.getIntegerNetProperty(
145 "java.net.httpclient.hpack.maxheadertablesize", 16 * K));
146 frame.setParameter(ENABLE_PUSH, Utils.getIntegerNetProperty(
147 "java.net.httpclient.enablepush", 1));
148 frame.setParameter(MAX_CONCURRENT_STREAMS, Utils.getIntegerNetProperty(
149 "java.net.httpclient.maxstreams", 16));
150 frame.setParameter(INITIAL_WINDOW_SIZE, Utils.getIntegerNetProperty(
151 "java.net.httpclient.windowsize", 32 * K));
152 frame.setParameter(MAX_FRAME_SIZE, Utils.getIntegerNetProperty(
153 "java.net.httpclient.maxframesize", 16 * K));
154 frame.computeLength();
155 return frame;
156 }
157 }