sijie commented on a change in pull request #1768: InputStream to read from S3 URL: https://github.com/apache/incubator-pulsar/pull/1768#discussion_r188060924
########## File path: pulsar-broker/src/main/java/org/apache/pulsar/broker/s3offload/impl/S3BackedInputStreamImpl.java ########## @@ -0,0 +1,110 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ +package org.apache.pulsar.broker.s3offload.impl; + +import com.amazonaws.AmazonClientException; +import com.amazonaws.services.s3.AmazonS3; +import com.amazonaws.services.s3.model.GetObjectRequest; +import com.amazonaws.services.s3.model.S3Object; + +import io.netty.buffer.ByteBuf; +import io.netty.buffer.PooledByteBufAllocator; + +import java.io.InputStream; +import java.io.IOException; + +import org.apache.pulsar.broker.s3offload.S3BackedInputStream; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class S3BackedInputStreamImpl extends S3BackedInputStream { + private static final Logger log = LoggerFactory.getLogger(S3BackedInputStreamImpl.class); + + private final AmazonS3 s3client; + private final String bucket; + private final String key; + private final ByteBuf buffer; + private final long objectLen; + private final int bufferSize; + + private long cursor; + + public S3BackedInputStreamImpl(AmazonS3 s3client, String bucket, String key, + long objectLen, int bufferSize) { + this.s3client = s3client; + this.bucket = bucket; + this.key = key; + this.buffer = PooledByteBufAllocator.DEFAULT.heapBuffer(bufferSize, bufferSize); + this.objectLen = objectLen; + this.bufferSize = bufferSize; + this.cursor = 0; + } + + @Override + public int read() throws IOException { + if (buffer.readableBytes() == 0) { + if (cursor >= objectLen) { + return -1; + } + long startRange = cursor; + long endRange = Math.min(cursor + bufferSize - 1, + objectLen - 1); + GetObjectRequest req = new GetObjectRequest(bucket, key) + .withRange(startRange, endRange); + log.debug("Reading range {}-{} from {}/{}", startRange, endRange, bucket, key); + try (S3Object obj = s3client.getObject(req)) { + Long[] range = obj.getObjectMetadata().getContentRange(); + long bytesRead = range[1] - range[0] + 1; + + buffer.clear(); + InputStream s = obj.getObjectContent(); + long bytesToCopy = bytesRead; Review comment: why not cast it to int here? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
