public static async Task <IActionResult> Run([HttpTrigger(AuthorizationLevel.Function, "post", Route = null)] HttpRequest request,
[DurableClient] IDurableClient client,
ILogger log)
{
log.LogInformation("C# HTTP trigger function processed a request.");
// Extract input from the POST body
string requestBody = await new StreamReader(request.Body).ReadToEndAsync();
var commandBody = JsonConvert.DeserializeObject <SteamCommandBody>(requestBody);
SteamCommandProcessor processor = new SteamCommandProcessor(commandBody.SteamWebApiKey);
var appList = await GetOrSetAppListAsync(client, processor);
var responseMessage = await processor.ProcessCommandAsync(commandBody.Command, appList);
return(new OkObjectResult(responseMessage));
}
/// <summary>
/// Gets or sets the Steam App List by using Azure Durable Entities. These entities are stored in Azure Blob Storage for resiliency
/// and re-use. Without these entities, we would need to re-query for this data evey time a command came in.
/// </summary>
/// <param name="client"></param>
/// <param name="processor"></param>
/// <returns></returns>
private static async Task <IDictionary <uint, string> > GetOrSetAppListAsync(IDurableClient client, SteamCommandProcessor processor)
{
var entityId = new EntityId(nameof(SteamAppList), "myAppList");
var entityResponse = await client.ReadEntityStateAsync <SteamAppList>(entityId);
IDictionary <uint, string> appList = new Dictionary <uint, string>();
if (entityResponse.EntityExists)
{
appList = entityResponse.EntityState.CurrentList;
}
else
{
appList = await processor.GetSteamAppListAsync();
await client.SignalEntityAsync <ISteamAppList>(entityId, proxy => proxy.Set(appList));
}
return(appList);
}
