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AzureFileStorage.cs
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AzureFileStorage.cs
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namespace Opc.Ua.Cloud.Publisher
{
using Azure.Storage.Blobs;
using Azure.Storage.Blobs.Models;
using Microsoft.Extensions.Logging;
using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Opc.Ua.Cloud.Publisher.Interfaces;
public class AzureFileStorage : IFileStorage
{
private readonly ILogger _logger;
private string _blobContainerName = "uacloudpublisher";
public AzureFileStorage(ILoggerFactory logger)
{
_logger = logger.CreateLogger("AzureFileStorage");
if (!string.IsNullOrEmpty(Environment.GetEnvironmentVariable("STORAGE_CONTAINER_NAME")))
{
_blobContainerName = Environment.GetEnvironmentVariable("STORAGE_CONTAINER_NAME");
}
}
public async Task<string> FindFileAsync(string path, string name, CancellationToken cancellationToken = default)
{
if (string.IsNullOrEmpty(path) || string.IsNullOrEmpty(name))
{
return null;
}
try
{
if (!string.IsNullOrEmpty(Environment.GetEnvironmentVariable("STORAGE_CONNECTION_STRING")))
{
// open blob storage
BlobContainerClient container = new BlobContainerClient(Environment.GetEnvironmentVariable("STORAGE_CONNECTION_STRING"), _blobContainerName);
await container.CreateIfNotExistsAsync(cancellationToken: cancellationToken).ConfigureAwait(false);
Diagnostics.Singleton.Info.ConnectedToCloudStorage = true;
var resultSegment = container.GetBlobsAsync();
await foreach (BlobItem blobItem in resultSegment.ConfigureAwait(false))
{
if (blobItem.Name.Contains(path.TrimStart('/')) && blobItem.Name.Contains(name))
{
return blobItem.Name;
}
}
}
return null;
}
catch (Exception ex)
{
_logger.LogError(ex.Message);
return null;
}
}
public async Task<string> StoreFileAsync(string path, byte[] content, CancellationToken cancellationToken = default)
{
if (string.IsNullOrEmpty(path) || (content == null))
{
return null;
}
try
{
if (!string.IsNullOrEmpty(Environment.GetEnvironmentVariable("STORAGE_CONNECTION_STRING")))
{
// open blob storage
BlobContainerClient container = new BlobContainerClient(Environment.GetEnvironmentVariable("STORAGE_CONNECTION_STRING"), _blobContainerName);
await container.CreateIfNotExistsAsync(cancellationToken: cancellationToken).ConfigureAwait(false);
Diagnostics.Singleton.Info.ConnectedToCloudStorage = true;
// Get a reference to the blob
BlobClient blob = container.GetBlobClient(path);
// Open the file and upload its data
using (MemoryStream file = new MemoryStream(content))
{
await blob.DeleteIfExistsAsync(cancellationToken: cancellationToken).ConfigureAwait(false);
await blob.UploadAsync(file, cancellationToken).ConfigureAwait(false);
// Verify uploaded
BlobProperties properties = await blob.GetPropertiesAsync(cancellationToken: cancellationToken).ConfigureAwait(false);
if (file.Length != properties.ContentLength)
{
throw new Exception("Could not verify upload!");
}
return path;
}
}
return null;
}
catch (Exception ex)
{
_logger.LogError(ex.Message);
return null;
}
}
public async Task<byte[]> LoadFileAsync(string name, CancellationToken cancellationToken = default)
{
if (string.IsNullOrEmpty(name))
{
return null;
}
try
{
if (!string.IsNullOrEmpty(Environment.GetEnvironmentVariable("STORAGE_CONNECTION_STRING")))
{
// open blob storage
BlobContainerClient container = new BlobContainerClient(Environment.GetEnvironmentVariable("STORAGE_CONNECTION_STRING"), _blobContainerName);
await container.CreateIfNotExistsAsync(cancellationToken: cancellationToken).ConfigureAwait(false);
Diagnostics.Singleton.Info.ConnectedToCloudStorage = true;
var resultSegment = container.GetBlobsAsync();
await foreach (BlobItem blobItem in resultSegment.ConfigureAwait(false))
{
if (blobItem.Name.Equals(name))
{
// Get a reference to the blob
BlobClient blob = container.GetBlobClient(blobItem.Name);
// Download the blob's contents and save it to a file
BlobDownloadInfo download = await blob.DownloadAsync(cancellationToken).ConfigureAwait(false);
using (MemoryStream file = new MemoryStream())
{
await download.Content.CopyToAsync(file, cancellationToken).ConfigureAwait(false);
// Verify download
BlobProperties properties = await blob.GetPropertiesAsync(cancellationToken: cancellationToken).ConfigureAwait(false);
if (file.Length != properties.ContentLength)
{
throw new Exception("Could not verify upload!");
}
return file.ToArray();
}
}
}
}
return null;
}
catch (Exception ex)
{
_logger.LogError(ex.Message);
return null;
}
}
}
}