/// <summary>
/// Constructor for the Google Cloud Storage subscription storage
/// </summary>
/// <param name="storageClient">Reference to the single instance of Google StorageClient</param>
/// <param name="loggerFactory">Reference to the logger factory to create the logger</param>
/// <param name="options">Options to configure the subscription storage</param>
public GoogleCloudStorageSubscriptionsStorage(StorageClient storageClient, IRebusLoggerFactory loggerFactory, GoogleCloudStorageSubscriptionOptions options)
{
_storageClient = storageClient ?? throw new ArgumentNullException(nameof(storageClient));
_options = options ?? throw new ArgumentNullException(nameof(options));
// Auto create the bucket when we start up, if required
CloudUtils.CreateBucketIfNotExists(storageClient, loggerFactory, options);
// Create our retry policy with Polly with a exponential back off strategy for retries, with jitter and retrying immediately on the first failure
_retry = CloudUtils.CreateRetryPolicy(options);
}
/// <summary>
/// Reads data from the data bus
/// </summary>
/// <param name="id">ID of the data bus object</param>
/// <returns>Stream to read the object from</returns>
public async Task <Stream> Read(string id)
{
return(await RetryCatchAsync(id, async objectName =>
{
// Make sure we update the read time for the object
if (!_options.DoNotUpdateLastReadTime)
{
await UpdateLastReadTimeAsync(objectName);
}
// Build an HTTP request to be able to stream the object from the bucket as the API does not have a
// direct function for that.
return await CloudUtils.DownloadAsStreamAsync(_storageClient, _options.BucketName, objectName);
}));
}