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.io.IOException;
29 import java.nio.ByteBuffer;
30 import java.util.List;
31 import java.util.concurrent.CompletableFuture;
32 import java.util.concurrent.Executor;
33 import jdk.incubator.http.internal.common.Log;
34 import static jdk.incubator.http.HttpClient.Version.HTTP_1_1;
35
36 /**
37 * Handles a HTTP/1.1 response in two blocking calls. readHeaders() and
38 * readBody(). There can be more than one of these per Http exchange.
39 */
40 class Http1Response<T> {
41
42 private volatile ResponseContent content;
43 private final HttpRequestImpl request;
44 private Response response;
45 private final HttpConnection connection;
46 private ResponseHeaders headers;
47 private int responseCode;
48 private ByteBuffer buffer;
49 private final Http1Exchange<T> exchange;
50 private final boolean redirecting; // redirecting
51 private boolean return2Cache; // return connection to cache when finished
52
53 Http1Response(HttpConnection conn, Http1Exchange<T> exchange) {
54 this.request = exchange.request();
55 this.exchange = exchange;
56 this.connection = conn;
57 this.redirecting = false;
58 buffer = exchange.getBuffer();
59 }
60
61 @SuppressWarnings("unchecked")
62 public void readHeaders() throws IOException {
63 String statusline = readStatusLine();
64 if (statusline == null) {
65 if (Log.errors()) {
66 Log.logError("Connection closed. Retry");
67 }
68 connection.close();
69 // connection was closed
70 throw new IOException("Connection closed");
71 }
72 if (!statusline.startsWith("HTTP/1.")) {
73 throw new IOException("Invalid status line: " + statusline);
74 }
75 if (Log.trace()) {
76 Log.logTrace("Statusline: {0}", statusline);
77 }
78 char c = statusline.charAt(7);
79 responseCode = Integer.parseInt(statusline.substring(9, 12));
80
81 headers = new ResponseHeaders(connection, buffer);
82 if (Log.headers()) {
83 logHeaders(headers);
84 }
85 response = new Response(
86 request, exchange.getExchange(),
87 headers, responseCode, HTTP_1_1);
88 }
89
90 private boolean finished;
91
92 synchronized void completed() {
93 finished = true;
94 }
95
96 synchronized boolean finished() {
97 return finished;
98 }
99
100 ByteBuffer getBuffer() {
101 return buffer;
102 }
103
104 int fixupContentLen(int clen) {
105 if (request.method().equalsIgnoreCase("HEAD")) {
106 return 0;
107 }
108 if (clen == -1) {
109 if (headers.firstValue("Transfer-encoding").orElse("")
110 .equalsIgnoreCase("chunked")) {
111 return -1;
112 }
113 return 0;
114 }
115 return clen;
116 }
117
118 public CompletableFuture<T> readBody(HttpResponse.BodyProcessor<T> p,
119 boolean return2Cache,
120 Executor executor) {
121 BlockingPushPublisher<List<ByteBuffer>> publisher = new BlockingPushPublisher<>();
122 return readBody(p, return2Cache, publisher, executor);
123 }
124
125 private CompletableFuture<T> readBody(HttpResponse.BodyProcessor<T> p,
126 boolean return2Cache,
127 AbstractPushPublisher<List<ByteBuffer>> publisher,
128 Executor executor) {
129 this.return2Cache = return2Cache;
130 final HttpResponse.BodyProcessor<T> pusher = p;
131 final CompletableFuture<T> cf = p.getBody().toCompletableFuture();
132
133 int clen0;
134 try {
135 clen0 = headers.getContentLength();
136 } catch (IOException ex) {
137 cf.completeExceptionally(ex);
138 return cf;
139 }
140 final int clen = fixupContentLen(clen0);
141
142 executor.execute(() -> {
143 try {
144 content = new ResponseContent(
145 connection, clen, headers, pusher,
146 publisher.asDataConsumer(),
147 (t -> {
148 publisher.acceptError(t);
149 connection.close();
150 cf.completeExceptionally(t);
151 }),
152 () -> onFinished()
153 );
154 publisher.subscribe(p);
155 if (cf.isCompletedExceptionally()) {
156 // if an error occurs during subscription
157 connection.close();
158 return;
159 }
160 content.pushBody(buffer);
161 } catch (Throwable t) {
162 cf.completeExceptionally(t);
163 }
164 });
165 return cf;
166 }
167
168 private void onFinished() {
169 if (return2Cache) {
170 Log.logTrace("Returning connection to the pool: {0}", connection);
171 connection.returnToCache(headers);
172 }
173 }
174
175 private void logHeaders(ResponseHeaders headers) {
176 StringBuilder sb = new StringBuilder("RESPONSE HEADERS:\n");
177 Log.dumpHeaders(sb, " ", headers);
178 Log.logHeaders(sb.toString());
179 }
180
181 Response response() {
182 return response;
183 }
184
185 boolean redirecting() {
186 return redirecting;
187 }
188
189 HttpHeaders responseHeaders() {
190 return headers;
191 }
192
193 int responseCode() {
194 return responseCode;
195 }
196
197 static final char CR = '\r';
198 static final char LF = '\n';
199
200 private int obtainBuffer() throws IOException {
201 int n = buffer.remaining();
202
203 if (n == 0) {
204 buffer = connection.read();
205 if (buffer == null) {
206 return -1;
207 }
208 n = buffer.remaining();
209 }
210 return n;
211 }
212
213 String readStatusLine() throws IOException {
214 boolean cr = false;
215 StringBuilder statusLine = new StringBuilder(128);
216 while ((obtainBuffer()) != -1) {
217 byte[] buf = buffer.array();
218 int offset = buffer.position();
219 int len = buffer.limit() - offset;
220
221 for (int i = 0; i < len; i++) {
222 char c = (char) buf[i+offset];
223
224 if (cr) {
225 if (c == LF) {
226 buffer.position(i + 1 + offset);
227 return statusLine.toString();
228 } else {
229 throw new IOException("invalid status line");
230 }
231 }
232 if (c == CR) {
233 cr = true;
234 } else {
235 statusLine.append(c);
236 }
237 }
238 // unlikely, but possible, that multiple reads required
239 buffer.position(buffer.limit());
240 }
241 return null;
242 }
243 }