| /******************************************************************** |
| * 2014 - |
| * open source under Apache License Version 2.0 |
| ********************************************************************/ |
| /** |
| * 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. |
| */ |
| #ifndef _HDFS_LIBHDFS3_CLIENT_INPUTSTREAMIMPL_H_ |
| #define _HDFS_LIBHDFS3_CLIENT_INPUTSTREAMIMPL_H_ |
| |
| #include "platform.h" |
| |
| #include "BlockReader.h" |
| #include "ExceptionInternal.h" |
| #include "FileSystem.h" |
| #include "Hash.h" |
| #include "InputStreamInter.h" |
| #include "Memory.h" |
| #include "PeerCache.h" |
| #include "rpc/RpcAuth.h" |
| #include "server/Datanode.h" |
| #include "server/LocatedBlock.h" |
| #include "server/LocatedBlocks.h" |
| #include "SessionConfig.h" |
| #include "Unordered.h" |
| #include "CryptoCodec.h" |
| #include "KmsClientProvider.h" |
| |
| #ifdef MOCK |
| #include "TestDatanodeStub.h" |
| #endif |
| |
| namespace Hdfs { |
| namespace Internal { |
| |
| /** |
| * A input stream used read data from hdfs. |
| */ |
| class InputStreamImpl: public InputStreamInter { |
| public: |
| InputStreamImpl(); |
| ~InputStreamImpl(); |
| |
| /** |
| * Open a file to read |
| * @param fs hdfs file system. |
| * @param path the file to be read. |
| * @param verifyChecksum verify the checksum. |
| */ |
| void open(shared_ptr<FileSystemInter> fs, const char * path, bool verifyChecksum); |
| |
| /** |
| * To read data from hdfs. |
| * @param buf the buffer used to filled. |
| * @param size buffer size. |
| * @return return the number of bytes filled in the buffer, it may less than size. |
| */ |
| int32_t read(char * buf, int32_t size); |
| |
| /** |
| * To read data from hdfs, block until get the given size of bytes. |
| * @param buf the buffer used to filled. |
| * @param size the number of bytes to be read. |
| */ |
| void readFully(char * buf, int64_t size); |
| |
| int64_t available(); |
| |
| /** |
| * To move the file point to the given position. |
| * @param pos the given position. |
| */ |
| void seek(int64_t pos); |
| |
| /** |
| * To get the current file point position. |
| * @return the position of current file point. |
| */ |
| int64_t tell(); |
| |
| /** |
| * Close the stream. |
| */ |
| void close(); |
| |
| /** |
| * Convert to a printable string |
| * |
| * @return return a printable string |
| */ |
| std::string toString(); |
| |
| /** |
| * Get KmsClientProvider. |
| */ |
| shared_ptr<KmsClientProvider> getKmsClientProvider(); |
| |
| /** |
| * Set KmsClientProvider. |
| */ |
| void setKmsClientProvider(shared_ptr<KmsClientProvider> kcp); |
| |
| /** |
| * Get CryptoCodec. |
| */ |
| shared_ptr<CryptoCodec> getCryptoCodec(); |
| |
| /** |
| * Set CryptoCodec. |
| */ |
| void setCryptoCodec(shared_ptr<CryptoCodec> cryptoCodec); |
| |
| private: |
| bool choseBestNode(); |
| bool isLocalNode(); |
| int32_t readInternal(char * buf, int32_t size); |
| int32_t readOneBlock(char * buf, int32_t size, bool shouldUpdateMetadataOnFailure); |
| int64_t getFileLength(); |
| int64_t readBlockLength(const LocatedBlock & b); |
| void checkStatus(); |
| void openInternal(shared_ptr<FileSystemInter> fs, const char * path, |
| bool verifyChecksum); |
| void readFullyInternal(char * buf, int64_t size); |
| void seekInternal(int64_t pos); |
| void seekToBlock(const LocatedBlock & lb); |
| void setupBlockReader(bool temporaryDisableLocalRead); |
| void updateBlockInfos(); |
| |
| private: |
| bool closed; |
| bool localRead; |
| bool readFromUnderConstructedBlock; |
| bool verify; |
| DatanodeInfo curNode; |
| exception_ptr lastError; |
| FileStatus fileInfo; |
| int maxGetBlockInfoRetry; |
| int64_t cursor; |
| int64_t endOfCurBlock; |
| int64_t lastBlockBeingWrittenLength; |
| int64_t prefetchSize; |
| PeerCache *peerCache; |
| RpcAuth auth; |
| shared_ptr<BlockReader> blockReader; |
| shared_ptr<FileSystemInter> filesystem; |
| shared_ptr<LocatedBlock> curBlock; |
| shared_ptr<LocatedBlocks> lbs; |
| shared_ptr<SessionConfig> conf; |
| std::string path; |
| std::vector<DatanodeInfo> failedNodes; |
| std::vector<char> localReaderBuffer; |
| shared_ptr<CryptoCodec> cryptoCodec; |
| shared_ptr<KmsClientProvider> kcp; |
| shared_ptr<RpcAuth> enAuth; |
| FileStatus fileStatus; |
| |
| #ifdef MOCK |
| private: |
| Hdfs::Mock::TestDatanodeStub * stub; |
| #endif |
| }; |
| |
| } |
| } |
| |
| #endif /* _HDFS_LIBHDFS3_CLIENT_INPUTSTREAMIMPL_H_ */ |