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using System.Diagnostics;
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using System.Net.Http.Json;
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using System.Text;
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using System.Text.Json;
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using System.Text.Json.Serialization;
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using DiskQueue;
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using LDClient.network.data;
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namespace LDClient.network {
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public class ApiClient : IApiClient {
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private readonly string _uri;
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private readonly HttpClient _client;
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private readonly IPersistentQueue _cache;
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private readonly uint _retryPeriod;
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private readonly uint _maxEntries;
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private readonly uint _maxRetries;
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public ApiClient(string url, uint port, string path, uint retryPeriod, uint maxEntries, uint maxRetries,
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string cacheFilename) {
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_uri = $"{url}:{port}{path}";
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_retryPeriod = retryPeriod;
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_maxEntries = maxEntries;
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_maxRetries = maxRetries;
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_client = new HttpClient();
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_cache = new PersistentQueue(cacheFilename);
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}
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public async Task SendPayloadAsync(Payload payload) {
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try {
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Stopwatch stopWatch = new();
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stopWatch.Start();
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var response = await _client.PostAsJsonAsync(_uri, payload, new JsonSerializerOptions {
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Converters = {
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new JsonStringEnumConverter( JsonNamingPolicy.CamelCase)
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}
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});
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stopWatch.Stop();
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CreateRequestLog(payload, response, stopWatch.ElapsedMilliseconds);
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response.EnsureSuccessStatusCode();
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} catch (Exception e) {
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Program.DefaultLogger.Error($"Failed to send {payload} to the server. Due to: {e.Message}");
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CachePayload(payload);
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}
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}
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private static void CreateRequestLog(Payload payload, HttpResponseMessage response, long durationMs) {
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var responseToLog = new {
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statusCode = response.StatusCode,
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content = response.Content,
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headers = response.Headers,
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errorMessage = response.RequestMessage,
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};
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Program.DefaultLogger.Info($"Request completed in {durationMs} ms,\n" +
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$"Request body: {payload},\n" +
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$"Response: {responseToLog}");
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}
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private async Task ResendPayloadsAsync() {
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var numberOfPayloadsToResend = Math.Min(_maxRetries, _cache.EstimatedCountOfItemsInQueue);
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var payloads = new List<Payload>();
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using (var session = _cache.OpenSession()) {
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for (var i = 0; i < numberOfPayloadsToResend; i++) {
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var rawBytes = session.Dequeue();
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var payload = JsonSerializer.Deserialize<Payload>(rawBytes);
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if (payload is not null) {
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payloads.Add(payload);
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}
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}
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session.Flush();
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}
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if (payloads.Count > 0) {
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Program.DefaultLogger.Debug($"ResendPayloadAsync -> {payloads.Count} unsent payloads");
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var tasks = new List<Task>();
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foreach (var payload in payloads) {
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Program.DefaultLogger.Info($"Resending {payload}.");
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tasks.Add(SendPayloadAsync(payload));
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}
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await Task.WhenAll(tasks);
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}
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}
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private void CachePayload(Payload payload) {
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Program.DefaultLogger.Info($"Storing {payload} into the cache.");
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var numberOfCachedPayloads = _cache.EstimatedCountOfItemsInQueue;
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using var session = _cache.OpenSession();
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if (numberOfCachedPayloads >= _maxEntries) {
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session.Dequeue();
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}
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var payloadJson = JsonSerializer.Serialize(payload);
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session.Enqueue(Encoding.UTF8.GetBytes(payloadJson));
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session.Flush();
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}
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public async void Run() {
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Program.DefaultLogger.Info("Api Client thread has started");
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while (true) {
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await ResendPayloadsAsync();
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Thread.Sleep((int) _retryPeriod);
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}
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// ReSharper disable once FunctionNeverReturns
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}
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}
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}
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