// Tries to load Function Maps from local folder
private static async Task<FunctionMapsMap> GetFunctionMapsFromFolderAsync(string folderName)
{
var result = new FunctionMapsMap();
string binFolder = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
string functionMapsFolder = Path.Combine(binFolder, "..", folderName, Globals.FunctionMapFolderName);
if (!Directory.Exists(functionMapsFolder))
{
return result;
}
foreach(var filePath in Directory.EnumerateFiles(functionMapsFolder, $"{Globals.FunctionMapFilePrefix}*.json"))
{
var nameParts = Path.GetFileName(filePath).Split('.');
if (nameParts.Length < 2)
{
continue;
}
string taskHubName = nameParts.Length > 2 ? nameParts[1] : string.Empty;
string json = await File.ReadAllTextAsync(filePath);
result.TryAdd(taskHubName, json);
}
return result;
}
// Tries to load Function Maps from underlying Azure Storage
private static async Task<FunctionMapsMap> GetFunctionMapsFromStorageAsync()
{
var result = new FunctionMapsMap();
try
{
string connectionString = Environment.GetEnvironmentVariable(EnvVariableNames.AzureWebJobsStorage);
var blobClient = CloudStorageAccount.Parse(connectionString).CreateCloudBlobClient();
// Listing all blobs in durable-functions-monitor/function-maps folder
var container = blobClient.GetContainerReference(Globals.TemplateContainerName);
string functionMapFolderName = Globals.FunctionMapFolderName + "/";
var fileNames = await container.ListBlobsAsync(functionMapFolderName);
// Loading blobs in parallel
await Task.WhenAll(fileNames.Select(async templateName =>
{
var blob = await blobClient.GetBlobReferenceFromServerAsync(templateName.Uri);
// Expecting the blob name to be like "dfm-function-map.[TaskHubName].json" or just "dfm-function-map.json"
var nameParts = blob.Name.Substring(functionMapFolderName.Length).Split('.');
if (nameParts.Length < 2 || nameParts.First() != Globals.FunctionMapFilePrefix || nameParts.Last() != "json")
{
return;
}
string taskHubName = nameParts.Length > 2 ? nameParts[1] : string.Empty;
using (var stream = new MemoryStream())
{
await blob.DownloadToStreamAsync(stream);
string templateText = Encoding.UTF8.GetString(stream.ToArray());
result.TryAdd(taskHubName, templateText);
}
}));
}
catch (Exception)
{
// Intentionally swallowing all exceptions here
}
return result;
}