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polling for task status.

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This commit is contained in:
Mark van der Wal 2020-03-25 11:39:26 +01:00
parent e6561308e5
commit 2a8f4cbb8d
3 changed files with 77 additions and 37 deletions
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27
FarmmapsApi/Extensions.cs
View File

@ -1,4 +1,7 @@
using System;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;
using FarmmapsApi.HttpMessageHandlers;
using FarmmapsApi.Models;
using FarmmapsApi.Services;
@ -9,7 +12,8 @@ namespace FarmmapsApi
{
public static class Extensions
{
public static IServiceCollection AddFarmmapsServices(this IServiceCollection serviceCollection, Configuration configuration)
public static IServiceCollection AddFarmmapsServices(this IServiceCollection serviceCollection,
Configuration configuration)
{
return serviceCollection
.AddSingleton(configuration)
@ -23,7 +27,26 @@ namespace FarmmapsApi
.AddTransient<FarmmapsAuthenticationHandler>()
.AddHttpClient<FarmmapsApiService>()
.AddHttpMessageHandler<FarmmapsAuthenticationHandler>()
.Services;;
.Services;
;
}
public static async Task PollTask(TimeSpan retryTime, Func<CancellationTokenSource, Task> callback)
{
var tokenSource = new CancellationTokenSource();
var token = tokenSource.Token;
do
{
try
{
await callback(tokenSource);
await Task.Delay(retryTime, token);
}
catch
{
// ignored
}
} while (!token.IsCancellationRequested);
}
}
}

21
FarmmapsApi/Services/FarmmapsApiService.cs
View File

@ -11,8 +11,9 @@ using System.Threading.Tasks;
using System.Web;
using FarmmapsApi.Models;
using IdentityModel;
using Microsoft.AspNetCore.Http.Connections;
using Microsoft.AspNetCore.SignalR.Client;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
@ -20,6 +21,7 @@ namespace FarmmapsApi.Services
{
public class FarmmapsApiService
{
private readonly ILogger<FarmmapsApiService> _logger;
private readonly HttpClient _httpClient;
private readonly OpenIdConnectService _openIdConnectService;
private readonly Configuration _configuration;
@ -28,9 +30,10 @@ namespace FarmmapsApi.Services
public event Action<EventMessage> EventCallback;
public FarmmapsApiService(HttpClient httpClient,
public FarmmapsApiService(HttpClient httpClient, ILogger<FarmmapsApiService> logger,
OpenIdConnectService openIdConnectService, Configuration configuration)
{
_logger = logger;
_httpClient = httpClient;
_openIdConnectService = openIdConnectService;
_configuration = configuration;
@ -65,13 +68,21 @@ namespace FarmmapsApi.Services
var uri = new Uri(_configuration.Endpoint);
var eventEndpoint = $"{uri.Scheme}://{uri.Host}:{uri.Port}/EventHub";
_hubConnection = new HubConnectionBuilder()
.WithUrl(eventEndpoint)
.WithUrl(eventEndpoint, HttpTransportType.WebSockets,
options => options.SkipNegotiation = true)
.ConfigureLogging(log => log.AddConsole())
.WithAutomaticReconnect()
.AddJsonProtocol()
.Build();
_hubConnection.On("Event", (EventMessage @event) => EventCallback?.Invoke(@event));
await _hubConnection.StartAsync();
await AuthenticateEventHub(accessToken);
_hubConnection.Reconnected += async s => await AuthenticateEventHub(accessToken);
_hubConnection.On("event", (Object @event) => _logger.LogInformation(@event.ToString()));
}
private async Task AuthenticateEventHub(string accessToken)
{
await _hubConnection.SendAsync("authenticate", accessToken);
}

66
FarmmapsApiSamples/NbsApp.cs
View File

@ -5,6 +5,7 @@ using FarmmapsApi.Models;
using FarmmapsApi.Services;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json.Linq;
using static FarmmapsApi.Extensions;
namespace FarmmapsApiSamples
{
@ -44,30 +45,10 @@ namespace FarmmapsApiSamples
if (myDriveRoot != null)
{
// create or get a cropfield
var cropfieldItem = await GetCreateCropfieldItem(myDriveRoot.Code);
// create or get target n item
var targetNItems = await
_farmmapsApiService.GetItemChildrenAsync(myDriveRoot.Code, USERINPUT_ITEMTYPE);
Item targetNItem;
if (targetNItems.Count == 0)
{
_logger.LogInformation("Creating targetN item");
var itemRequest = CreateTargetNItemRequest(myDriveRoot.Code);
targetNItem = await _farmmapsApiService.CreateItemAsync(itemRequest);
}
else
{
targetNItem = targetNItems[0];
}
await CalculateTargetN(cropfieldItem, targetNItem, 60);
await Task.Delay(2000);
var cropfieldItem = await GetOrCreateCropfieldItem(myDriveRoot.Code);
var targetN = await CalculateTargetN(cropfieldItem, 60);
_logger.LogInformation($"TargetN: {targetN}");
}
}
catch (Exception ex)
@ -76,7 +57,7 @@ namespace FarmmapsApiSamples
}
}
private async Task<Item> GetCreateCropfieldItem(string parentItemCode)
private async Task<Item> GetOrCreateCropfieldItem(string parentItemCode)
{
var cropfieldItems = await
_farmmapsApiService.GetItemChildrenAsync(parentItemCode, "vnd.farmmaps.itemtype.cropfield");
@ -101,8 +82,25 @@ namespace FarmmapsApiSamples
return await _farmmapsApiService.CreateItemAsync(cropfieldItemRequest);
}
private async Task<Item> CalculateTargetN(Item cropfieldItem, Item targetNItem, int targetYield)
private async Task<double> CalculateTargetN(Item cropfieldItem, int targetYield)
{
var targetNItems = await
_farmmapsApiService.GetItemChildrenAsync(cropfieldItem.ParentCode, USERINPUT_ITEMTYPE);
Item targetNItem;
if (targetNItems.Count == 0)
{
_logger.LogInformation("Creating targetN item");
var itemRequest = CreateTargetNItemRequest(cropfieldItem.ParentCode);
targetNItem = await _farmmapsApiService.CreateItemAsync(itemRequest);
}
else
{
targetNItem = targetNItems[0];
}
_logger.LogInformation($"Calculating targetN with targetYield: {targetYield}");
var nbsTargetNRequest = new TaskRequest {TaskType = VRANBS_TASK};
nbsTargetNRequest.attributes["operation"] = "targetn";
nbsTargetNRequest.attributes["inputCode"] = targetNItem.Code;
@ -111,11 +109,19 @@ namespace FarmmapsApiSamples
nbsTargetNRequest.attributes["targetYield"] = targetYield.ToString();
string itemTaskCode = await _farmmapsApiService.QueueTaskAsync(cropfieldItem.Code, nbsTargetNRequest);
// poll task
// get target N item again
await PollTask(TimeSpan.FromSeconds(3), async (tokenSource) =>
{
var itemTask = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
return targetNItem;
if (itemTask.State != ItemTaskState.Processing && itemTask.State != ItemTaskState.Scheduled)
tokenSource.Cancel();
});
var item = await _farmmapsApiService.GetItemAsync(targetNItem.Code);
if (item.Data.ContainsKey("TargetN"))
return item.Data["TargetN"].Value<double>();
return 0;
}
private ItemRequest CreateTargetNItemRequest(string parentItemCode)