78 lines
2.4 KiB
C#
78 lines
2.4 KiB
C#
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using System;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Net.Http;
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using Newtonsoft.Json;
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namespace LeanCloud.Common {
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public class AppRouterController {
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private AppRouterState currentState;
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private readonly SemaphoreSlim locker = new SemaphoreSlim(1);
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public async Task<AppRouterState> Get(string appId) {
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if (string.IsNullOrEmpty(appId)) {
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throw new ArgumentNullException(nameof(appId));
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}
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if (currentState != null && !currentState.IsExpired) {
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return currentState;
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}
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await locker.WaitAsync();
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try {
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if (currentState == null) {
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try {
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currentState = await QueryAsync(appId);
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} catch (Exception) {
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currentState = AppRouterState.GetFallbackServers(appId);
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}
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}
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return currentState;
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} finally {
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locker.Release();
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}
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}
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async Task<AppRouterState> QueryAsync(string appId) {
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HttpClient client = null;
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HttpRequestMessage request = null;
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HttpResponseMessage response = null;
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try {
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string url = string.Format("https://app-router.com/2/route?appId={0}", appId);
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client = new HttpClient();
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request = new HttpRequestMessage {
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RequestUri = new Uri(url),
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Method = HttpMethod.Get
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};
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HttpUtils.PrintRequest(client, request);
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response = await client.SendAsync(request);
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string content = await response.Content.ReadAsStringAsync();
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HttpUtils.PrintResponse(response);
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AppRouterState state = JsonConvert.DeserializeObject<AppRouterState>(content);
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state.Source = "router";
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return state;
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} finally {
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if (client != null) {
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client.Dispose();
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}
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if (request != null) {
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request.Dispose();
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}
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if (response != null) {
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response.Dispose();
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}
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}
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}
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public void Clear() {
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currentState = null;
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}
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}
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}
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