8568327a56
* Refined DataLake sample * Added DirectoryClient::GetFileClient, resolved some comment and test failures. * Resolved an issue introduced by lowercasing response headers resulting in error code/message not being passed, and refined sample. * Refined the structure according to comments. * Changed buffer initialziation to stack allocated. * Resolved some further comments.
116 lines
4.0 KiB
C++
116 lines
4.0 KiB
C++
// Copyright (c) Microsoft Corporation. All rights reserved.
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// SPDX-License-Identifier: MIT
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#include "datalake/datalake.hpp"
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#include "samples_common.hpp"
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#include <iostream>
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SAMPLE(DataLakeGettingStarted, DataLakeGettingStarted)
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void DataLakeGettingStarted()
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{
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// Please note that you can always reference test cases for advanced usages.
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using namespace Azure::Storage::Files::DataLake;
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std::string fileSystemName = "sample-file-system";
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std::string directoryName = "sample-directory";
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std::string fileName = "sample-file";
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// Initializing a ServiceClient that can then initialize the FileSystemClient or list file
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// systems.
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auto serviceClient = ServiceClient::CreateFromConnectionString(GetConnectionString());
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// Initializing a FileSystemClient that can then initialize the PathClient, FileClient,
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// DirectoryClient.
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auto fileSystemClient
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= FileSystemClient::CreateFromConnectionString(GetConnectionString(), fileSystemName);
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try
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{
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// Create file systems and ignore the already exist error.
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try
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{
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fileSystemClient.Create();
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}
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catch (Azure::Storage::StorageError& e)
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{
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if (e.ErrorCode != "ContainerAlreadyExists")
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{
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throw;
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}
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else
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{
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std::cout << "ErrorCode: " + e.ErrorCode << std::endl;
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std::cout << "ReasonPhrase: " + e.ReasonPhrase << std::endl;
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}
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}
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// Create a directory.
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auto directoryClient = fileSystemClient.GetDirectoryClient(directoryName);
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directoryClient.Create();
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// Creates a file under the directory.
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auto fileClient = directoryClient.GetFileClient(fileName);
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fileClient.Create();
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// Append/flush/read data from the client.
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// Append data
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// Initialize the string that contains the first piece of data to be appended to the file.
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std::string str1 = "Hello ";
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// Initialize the buffer that represents what contains your data to be appended, please ignore
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// how it is constructed here, since the memory copy is not efficient.
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std::string str2 = "World!";
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std::vector<uint8_t> buffer(str1.begin(), str1.end());
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// One way of passing in the buffer, note that the buffer is not copied.
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auto bufferStream = Azure::Core::Http::MemoryBodyStream(buffer);
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fileClient.AppendData(&bufferStream, 0 /* Offset of the position to be appended.*/);
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// Another way of passing in the buffer, note that buffer is also not copied.
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bufferStream = Azure::Core::Http::MemoryBodyStream(
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reinterpret_cast<const uint8_t*>(str2.data()), str2.size());
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fileClient.AppendData(&bufferStream, str1.size());
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// Flush
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fileClient.FlushData(str1.size() + str2.size());
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// Read
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auto result = fileClient.Read();
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Azure::Core::Context context;
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std::vector<uint8_t> downloaded
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= Azure::Core::Http::BodyStream::ReadToEnd(context, *(result->Body));
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// downloaded contains your downloaded data.
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std::cout << "Downloaded data was:\n" + std::string(downloaded.begin(), downloaded.end())
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<< std::endl;
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// List all file systems.
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std::string continuation;
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std::vector<FileSystem> fileSystems;
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do
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{
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auto response = serviceClient.ListFileSystems();
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if (response->Continuation.HasValue())
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{
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continuation = response->Continuation.GetValue();
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}
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fileSystems.insert(
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fileSystems.end(), response->Filesystems.begin(), response->Filesystems.end());
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} while (!continuation.empty());
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// Delete file system.
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fileSystemClient.Delete();
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std::cout << "Successfully finished sample." << std::endl;
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}
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catch (const Azure::Storage::StorageError& e)
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{
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// Deal with the information when storage error is met.
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std::cout << "Error encountered when sending the request." << std::endl;
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std::cout << "ErrorCode: " + e.ErrorCode << std::endl;
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std::cout << "Message: " + e.Message << std::endl;
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std::cout << "ReasonPhrase: " + e.ReasonPhrase << std::endl;
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std::cout << "RequestId: " + e.RequestId << std::endl;
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}
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}
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