jyothsnakonisa commented on code in PR #147: URL: https://github.com/apache/cassandra-sidecar/pull/147#discussion_r1866539067
########## server/src/main/java/org/apache/cassandra/sidecar/routes/cdc/StreamCdcSegmentHandler.java: ########## @@ -0,0 +1,195 @@ +/* + * 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.cassandra.sidecar.routes.cdc; + +import java.io.File; +import java.io.IOException; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import com.google.inject.Inject; +import com.google.inject.Singleton; +import io.netty.handler.codec.http.HttpHeaderNames; +import io.netty.handler.codec.http.HttpResponseStatus; +import io.vertx.core.Future; +import io.vertx.core.http.HttpServerRequest; +import io.vertx.core.net.SocketAddress; +import io.vertx.ext.web.RoutingContext; +import io.vertx.ext.web.handler.HttpException; +import org.apache.cassandra.sidecar.cdc.CdcLogCache; +import org.apache.cassandra.sidecar.cluster.instance.InstanceMetadata; +import org.apache.cassandra.sidecar.concurrent.ExecutorPools; +import org.apache.cassandra.sidecar.concurrent.TaskExecutorPool; +import org.apache.cassandra.sidecar.models.HttpResponse; +import org.apache.cassandra.sidecar.routes.AbstractHandler; +import org.apache.cassandra.sidecar.utils.CassandraInputValidator; +import org.apache.cassandra.sidecar.utils.CdcUtil; +import org.apache.cassandra.sidecar.utils.FileStreamer; +import org.apache.cassandra.sidecar.utils.InstanceMetadataFetcher; + +import static org.apache.cassandra.sidecar.utils.CdcUtil.getIdxFileName; +import static org.apache.cassandra.sidecar.utils.CdcUtil.isLogFile; +import static org.apache.cassandra.sidecar.utils.CdcUtil.isValid; +import static org.apache.cassandra.sidecar.utils.CdcUtil.parseIndexFile; +import static org.apache.cassandra.sidecar.utils.HttpExceptions.wrapHttpException; + +/** + * Provides REST endpoint for streaming cdc commit logs. + */ +@Singleton +public class StreamCdcSegmentHandler extends AbstractHandler<String> +{ + private static final Logger LOGGER = LoggerFactory.getLogger(StreamCdcSegmentHandler.class); + + private final FileStreamer fileStreamer; + private final CdcLogCache cdcLogCache; + private final TaskExecutorPool serviceExecutorPool; + + @Inject + public StreamCdcSegmentHandler(InstanceMetadataFetcher metadataFetcher, + FileStreamer fileStreamer, + CdcLogCache cdcLogCache, + ExecutorPools executorPools, + CassandraInputValidator validator) + { + super(metadataFetcher, executorPools, validator); + this.fileStreamer = fileStreamer; + this.cdcLogCache = cdcLogCache; + this.serviceExecutorPool = executorPools.service(); + } + + @Override + protected void handleInternal(RoutingContext context, + HttpServerRequest httpRequest, + String host, + SocketAddress remoteAddress, + String segment) + { + cdcLogCache.initMaybe(); + InstanceMetadata instance = metadataFetcher.instance(host); + String cdcDir = instance.cdcDir(); + File segmentFile = new File(cdcDir, segment); + validateCdcSegmentFile(segmentFile); + + String indexFileName = getIdxFileName(segment); + File indexFile = new File(cdcDir, indexFileName); + HttpResponse response = new HttpResponse(context.request(), context.response()); + streamCdcSegmentAsync(context, segmentFile, indexFile, response, instance) + // Touch the files at the end of the request + // If the file exists in cache, its expiry is extended; otherwise, the cache is not changed. + .onSuccess(res -> cdcLogCache.touch(segmentFile, indexFile)) + .onFailure(cause -> processFailure(cause, context, host, remoteAddress, segment)); + } + + private Future<Void> streamCdcSegmentAsync(RoutingContext context, + File segmentFile, + File indexFile, + HttpResponse response, + InstanceMetadata instance) + { + long segmentFileLength = segmentFile.length(); + return getOrCreateLinkedCdcFilePairAsync(segmentFile, indexFile) + .compose(cdcFilePair -> + openCdcIndexFileAsync(cdcFilePair) + .compose(cdcIndex -> { + // stream the segment file; depending on whether the cdc segment is complete or not, cap the range of file to stream + String rangeHeader = context.request().getHeader(HttpHeaderNames.RANGE); + return cdcIndex.isCompleted + ? fileStreamer.parseRangeHeader(rangeHeader, segmentFileLength) + : fileStreamer.parseRangeHeader(rangeHeader, cdcIndex.latestFlushPosition); + }) + .compose(range -> fileStreamer.stream(response, instance.id(), cdcFilePair.segmentFile.getAbsolutePath(), segmentFileLength, range)) + ); + } + + @Override + protected String extractParamsOrThrow(RoutingContext context) + { + return context.request().getParam("segment"); + } + + private void validateCdcSegmentFile(File segmentFile) throws HttpException + { + // We only accept stream request for log files + if (!isValid(segmentFile.getName()) || !isLogFile(segmentFile.getName())) + { + throw wrapHttpException(HttpResponseStatus.BAD_REQUEST, "Invalid path param for CDC segment: " + segmentFile.getName()); + } + + // check file existence + if (!segmentFile.exists()) + { + throw wrapHttpException(HttpResponseStatus.NOT_FOUND, "CDC segment not found: " + segmentFile.getName()); + } + + // check file content + long fileSize = segmentFile.length(); + if (fileSize == 0) + { + throw wrapHttpException(HttpResponseStatus.REQUESTED_RANGE_NOT_SATISFIABLE, "File is emtpy"); + } + } + + private Future<CdcFilePair> getOrCreateLinkedCdcFilePairAsync(File segmentFile, File indexFile) + { + return serviceExecutorPool.executeBlocking(() -> { + // hardlink the segment and its index file, + // in order to guarantee the files exist in the subsequent calls (within the cache duration) + try + { + File linkedSegmentFile = cdcLogCache.createLinkedFileInCache(segmentFile); + File linkedIndexFile = cdcLogCache.createLinkedFileInCache(indexFile); + return new CdcFilePair(linkedSegmentFile, linkedIndexFile); + } + catch (IOException e) + { + throw wrapHttpException(HttpResponseStatus.INTERNAL_SERVER_ERROR, "Failed to prepare CDC segment to stream", e); Review Comment: Added log. -- This is an automated message from the Apache Git Service. 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