Azure Function Status Code 500 internal server error - azure

Question

I have a logic app that uses azure function as a http trigger and gets a return string.
When the azure function is to receive a Base64 string, create a file with the information and uploads to the assigned storage account, I keep getting status code 500 internal server error from the Azure function every time I run it. After many trial and error I deduced the problem occurs from when the file is to be created from the Base64 string and when the blob container client is created.
So Help me Please.
UPDATE: As per some of your suggestions, I implemented application insights ran it a few times and got this error occuring twice:
Azure.RequestFailedException
Message: Exception while executing function: BlobAdd The specifed resource name contains invalid characters
Status: 400 (The specifed resource name contains invalid characters.)
ErrorCode: InvalidResourceName
FailedMethod: Azure.Storage.Blobs.BlobRestClient+Container.CreateAsync_CreateResponse.
public static async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
ILogger log)
{
log.LogInformation("C# HTTP trigger function processed a request.");
string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
return await Base64(requestBody);
}
public static async Task<IActionResult> Base64(string Base64Body)
{
string HoldDBase = "";
string TestBlobData = "null";
if (Base64Body.Length > 10)
{
HoldDBase = Base64Body;
}
else
{
TestBlobData = "The Base64Body did not Pass";
return (ActionResult)new OkObjectResult
(
new
{
TestBlobData
}
);
}
//Connection string of the Storage Account Azure
string ConnectionString = "xxxxxxxxx";
// Create a BlobServiceClient object which will be used to create a container client
BlobServiceClient blobServiceClient = new BlobServiceClient(ConnectionString);
//Create a unique name of the container
string ContainerName = "Base64_Blob" + Guid.NewGuid().ToString();
//create the container and return a container client Object
BlobContainerClient ContainerClient = await blobServiceClient.CreateBlobContainerAsync(ContainerName); //Problem Here
//create a local file in the Storage
string localPath = "D:/Reliance/OlaForm/uploadsO";
string fileName = "quickstart" + Guid.NewGuid().ToString() + ".txt";
string localFilePath = Path.Combine(localPath, fileName);
//convert string to bytes
byte[] BaseBytes = Convert.FromBase64String(HoldDBase);
//create file in local data
await File.WriteAllBytesAsync(localFilePath,BaseBytes); //Problem Here
//get reference to a blob
BlobClient blobclient = ContainerClient.GetBlobClient(fileName);
// Open the file and upload its data
FileStream uploadFileStream = File.OpenRead(localFilePath);
await blobclient.UploadAsync(uploadFileStream);
// blobclient.Upload(uploadFileStream);
uploadFileStream.Close();
//blob id from blobclient and return it
TestBlobData = blobclient.ToString();
TestBlobData = HoldDBase;
return (ActionResult)new OkObjectResult
(
new {
TestBlobData
}
);
}

Answer 1

You are trying to write to the "D" disk. Since the Azure function does not have direct access to disks, you get a 500 error when trying to write to a disk that does not exist.
To write to a file from an Azure function you can use the Azure Storage SDK.