src/main/java/org/apache/cassandra/sidecar/routes/StreamSSTableComponentHandler.java

/*
 * 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;


import java.nio.file.NoSuchFileException;

import com.google.inject.Inject;
import com.google.inject.Singleton;
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 org.apache.cassandra.sidecar.concurrent.ExecutorPools;
import org.apache.cassandra.sidecar.data.StreamSSTableComponentRequest;
import org.apache.cassandra.sidecar.snapshots.SnapshotPathBuilder;
import org.apache.cassandra.sidecar.utils.CassandraInputValidator;
import org.apache.cassandra.sidecar.utils.InstanceMetadataFetcher;

import static org.apache.cassandra.sidecar.utils.HttpExceptions.wrapHttpException;

/**
 * This handler validates that the component exists in the cluster and sets up the context
 * for the {@link FileStreamHandler} to stream the component back to the client
 */
@Singleton
public class StreamSSTableComponentHandler extends AbstractHandler<StreamSSTableComponentRequest>
{
    private final SnapshotPathBuilder snapshotPathBuilder;
    private final CassandraInputValidator validator;

    @Inject
    public StreamSSTableComponentHandler(InstanceMetadataFetcher metadataFetcher,
                                         SnapshotPathBuilder snapshotPathBuilder,
                                         CassandraInputValidator validator,
                                         ExecutorPools executorPools)
    {
        super(metadataFetcher, executorPools, validator);
        this.snapshotPathBuilder = snapshotPathBuilder;
        this.validator = validator;
    }

    @Override
    public void handleInternal(RoutingContext context,
                               HttpServerRequest httpRequest,
                               String host,
                               SocketAddress remoteAddress,
                               StreamSSTableComponentRequest request)
    {
        validate(request)
        .compose(validParams ->
                 snapshotPathBuilder.build(host, validParams)
                                    .onSuccess(path -> {
                                        logger.debug("StreamSSTableComponentHandler handled {} for client {}. "
                                                     + "Instance: {}", path, remoteAddress, host);
                                        context.put(FileStreamHandler.FILE_PATH_CONTEXT_KEY, path)
                                               .next();
                                    }))
        .onFailure(cause -> {
            String errMsg =
            "StreamSSTableComponentHandler failed for request: {} from: {}. Instance: {}";
            logger.error(errMsg, request, remoteAddress, host, cause);
            if (cause instanceof NoSuchFileException)
            {
                context.fail(wrapHttpException(HttpResponseStatus.NOT_FOUND, cause.getMessage()));
            }
            else
            {
                context.fail(wrapHttpException(HttpResponseStatus.BAD_REQUEST, "Invalid request for " + request));
            }
        });
    }

    @Override
    protected StreamSSTableComponentRequest extractParamsOrThrow(RoutingContext context)
    {
        return new StreamSSTableComponentRequest(qualifiedTableName(context),
                                                 context.pathParam("snapshot"),
                                                 context.pathParam("component")
        );
    }

    private Future<StreamSSTableComponentRequest> validate(StreamSSTableComponentRequest request)
    {
        validator.validateComponentName(request.componentName());
        validator.validateSnapshotName(request.snapshotName());
        return Future.succeededFuture(request);
    }
}