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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.squareup.okhttp.internal.http;
     18 
     19 import java.io.IOException;
     20 import java.net.ProtocolException;
     21 import okio.Buffer;
     22 import okio.Sink;
     23 import okio.Timeout;
     24 
     25 import static com.squareup.okhttp.internal.Util.checkOffsetAndCount;
     26 
     27 /**
     28  * An HTTP request body that's completely buffered in memory. This allows
     29  * the post body to be transparently re-sent if the HTTP request must be
     30  * sent multiple times.
     31  */
     32 public final class RetryableSink implements Sink {
     33   private boolean closed;
     34   private final int limit;
     35   private final Buffer content = new Buffer();
     36 
     37   public RetryableSink(int limit) {
     38     this.limit = limit;
     39   }
     40 
     41   public RetryableSink() {
     42     this(-1);
     43   }
     44 
     45   @Override public void close() throws IOException {
     46     if (closed) return;
     47     closed = true;
     48     if (content.size() < limit) {
     49       throw new ProtocolException(
     50           "content-length promised " + limit + " bytes, but received " + content.size());
     51     }
     52   }
     53 
     54   @Override public void write(Buffer source, long byteCount) throws IOException {
     55     if (closed) throw new IllegalStateException("closed");
     56     checkOffsetAndCount(source.size(), 0, byteCount);
     57     if (limit != -1 && content.size() > limit - byteCount) {
     58       throw new ProtocolException("exceeded content-length limit of " + limit + " bytes");
     59     }
     60     content.write(source, byteCount);
     61   }
     62 
     63   @Override public void flush() throws IOException {
     64   }
     65 
     66   @Override public Timeout timeout() {
     67     return Timeout.NONE;
     68   }
     69 
     70   public long contentLength() throws IOException {
     71     return content.size();
     72   }
     73 
     74   public void writeToSocket(Sink socketOut) throws IOException {
     75     // Copy the content; otherwise we won't have data to retry.
     76     Buffer buffer = new Buffer();
     77     content.copyTo(buffer, 0, content.size());
     78     socketOut.write(buffer, buffer.size());
     79   }
     80 }
     81