MRB webassembly

MesaFabApproval.Client/Services/CustomerService.cs

@@ -0,0 +1,51 @@
+using System.Text.Json;
+
+using Microsoft.Extensions.Caching.Memory;
+
+namespace MesaFabApproval.Client.Services;
+
+public interface ICustomerService {
+    Task<IEnumerable<string>> GetAllCustomerNames();
+}
+
+public class CustomerService : ICustomerService {
+    private readonly IMemoryCache _cache;
+    private readonly IHttpClientFactory _httpClientFactory;
+
+    public CustomerService(IMemoryCache cache, IHttpClientFactory httpClientFactory) {
+        _cache = cache ?? throw new ArgumentNullException("IMemoryCache not injected");
+        _httpClientFactory = httpClientFactory ??
+            throw new ArgumentNullException("IHttpClientFactory not injected");
+    }
+
+    public async Task<IEnumerable<string>> GetAllCustomerNames() {
+        IEnumerable<string>? allCustomerNames = null;
+
+        allCustomerNames = _cache.Get<IEnumerable<string>>("allCustomerNames");
+
+        if (allCustomerNames is null) {
+            HttpClient httpClient = _httpClientFactory.CreateClient("API");
+
+            HttpRequestMessage requestMessage = new(HttpMethod.Get, $"customer/all");
+
+            HttpResponseMessage responseMessage = await httpClient.SendAsync(requestMessage);
+
+            if (responseMessage.IsSuccessStatusCode) {
+                string responseContent = await responseMessage.Content.ReadAsStringAsync();
+
+                JsonSerializerOptions jsonSerializerOptions = new() {
+                    PropertyNameCaseInsensitive = true
+                };
+
+                allCustomerNames = JsonSerializer.Deserialize<IEnumerable<string>>(responseContent, jsonSerializerOptions) ??
+                    throw new Exception("Unable to parse names from API response");
+
+                _cache.Set($"allCustomerNames", allCustomerNames, DateTimeOffset.Now.AddHours(1));
+            } else {
+                throw new Exception($"Unable to get all customer names, because {responseMessage.ReasonPhrase}");
+            }
+        }
+
+        return allCustomerNames;
+    }
+}