Convert Azure Function to WebAPI call Azure Storage - azure

Question

I've been trying to convert the functions in this https://blog.jeremylikness.com/build-a-serverless-link-shortener-with-analytics-faster-than-finishing-your-latte-8c094bb1df2c to a WebAPI equivalent. This is my webapi call:
[HttpPost]
public async Task<IActionResult> PostAsync([FromBody] ShortRequest shortRequest)
{
_logger.LogInformation($"ShrinkUrl api called with req: {shortRequest}");
if(!Request.IsHttps && !Request.Host.Host.Contains("localhost"))
return StatusCode(StatusCodes.Status400BadRequest);
if (string.IsNullOrEmpty(shortRequest.Input))
return StatusCode(StatusCodes.Status404NotFound);
try
{
var result = new List<ShortResponse>();
var analytics = new Analytics();
// determine whether or not to process analytics tags
bool tagMediums = analytics.Validate(shortRequest);
var campaign = string.IsNullOrWhiteSpace(shortRequest.Campaign) ? DefaultCampaign : shortRequest.Campaign;
var url = shortRequest.Input.Trim();
var utm = analytics.TagUtm(shortRequest);
var wt = analytics.TagWt(shortRequest);
_logger.LogInformation($"URL: {url} Tag UTM? {utm} Tag WebTrends? {wt}");
// get host for building short URL
var host = Request.Scheme + "://" + Request.Host;
await _tableOut.CreateIfNotExistsAsync();
if (_keyTable == null)
{
_logger.LogInformation($"Keytable is null, creating initial partition key of 1");
_keyTable = new NextId
{
PartitionKey = "1",
RowKey = "KEY",
Id = 1024
};
var keyAdd = TableOperation.Insert(_keyTable);
await _tableOut.ExecuteAsync(keyAdd);
}
// strategy for getting a new code
string getCode() => Utility.Encode(_keyTable.Id++);
// strategy for logging
void logFn(string msg) => _logger.LogInformation(msg);
// strategy to save the key
async Task saveKeyAsync()
{
var operation = TableOperation.Replace(_keyTable);
await _tableOut.ExecuteAsync(operation);
}
// strategy to insert the new short url entry
async Task saveEntryAsync(TableEntity entry)
{
var operation = TableOperation.Insert(entry);
await _tableOut.ExecuteAsync(operation);
}
// strategy to create a new URL and track the dependencies
async Task saveWithTelemetryAsync(TableEntity entry)
{
await TrackDependencyAsync(
"AzureTableStorageInsert",
"Insert",
async () => await saveEntryAsync(entry),
() => true);
await TrackDependencyAsync(
"AzureTableStorageUpdate",
"Update",
async () => await saveKeyAsync(),
() => true);
}
if (tagMediums)
{
// this will result in multiple entries depending on the number of
// mediums passed in
result.AddRange(await analytics.BuildAsync(
shortRequest,
Source,
host,
getCode,
saveWithTelemetryAsync,
logFn,
HttpUtility.ParseQueryString));
}
else
{
// no tagging, just pass-through the URL
result.Add(await Utility.SaveUrlAsync(
url,
null,
host,
getCode,
logFn,
saveWithTelemetryAsync));
}
_logger.LogInformation($"Done.");
//return req.CreateResponse(HttpStatusCode.OK, result);
}
catch (Exception ex)
{
_logger.LogError("An unexpected error was encountered.", ex);
//return req.CreateErrorResponse(HttpStatusCode.BadRequest, ex);
}
return null;
}
And this is the function params:
[FunctionName("ShortenUrl")]
public static async Task<HttpResponseMessage>([HttpTrigger(AuthorizationLevel.Function, "post")],HttpRequestMessage req,
[Table(Utility.TABLE, "1", Utility.KEY, Take = 1)]NextId keyTable,
[Table(Utility.TABLE)]CloudTable, TraceWriter log)
The azure function takes care of ensuring that the keyTable contains the next Id in the counter but I cannot figure out how to do the same in the webapi call.
Any ideas?