Caching response from Azure rest api (#326)

Co-authored-by: RupengLiu <[email protected]>

Author: bremnes

src/APIM_ARMTemplate/apimtemplate/Extractor/EntityExtractors/EntityExtractor.cs

@@ -1,19 +1,26 @@
-using System.Net.Http;
+using System.Collections.Generic;
+using System.Net.Http;
 using System.Net.Http.Headers;
 using System.Threading.Tasks;
 using Microsoft.Azure.Management.ApiManagement.ArmTemplates.Common;
-using System.Collections.Generic;
 using Microsoft.Azure.Management.ApiManagement.ArmTemplates.Create;
+using Microsoft.Extensions.Caching.Memory;
 
 namespace Microsoft.Azure.Management.ApiManagement.ArmTemplates.Extract
 {
     public class EntityExtractor
     {
         public string baseUrl = "https://management.azure.com";
         internal Authentication auth = new Authentication();
+        private static readonly IMemoryCache _cache = new MemoryCache(new MemoryCacheOptions());
 
         public static async Task<string> CallApiManagementAsync(string azToken, string requestUrl)
         {
+            if (_cache.TryGetValue(requestUrl, out string cachedResponseBody))
+            {
+                return cachedResponseBody;
+            }
+
             using (HttpClient httpClient = new HttpClient())
             {
                 var request = new HttpRequestMessage(HttpMethod.Get, requestUrl);
@@ -24,6 +31,9 @@ public static async Task<string> CallApiManagementAsync(string azToken, string r
 
                 response.EnsureSuccessStatusCode();
                 string responseBody = await response.Content.ReadAsStringAsync();
+
+                _cache.Set(requestUrl, responseBody);
+
                 return responseBody;
             }
         }
@@ -58,4 +68,4 @@ public Template GenerateEmptyTemplateWithParameters(string policyXMLBaseUrl, str
             return armTemplate;
         }
     }
-}
+}

src/APIM_ARMTemplate/apimtemplate/apimtemplate.csproj

@@ -24,6 +24,7 @@
     <PackageReference Include="Microsoft.Azure.Management.ApiManagement" Version="4.0.6-preview" />
     <PackageReference Include="Microsoft.Azure.Management.Authorization" Version="2.9.0-preview" />
     <PackageReference Include="Microsoft.Azure.Management.Fluent" Version="1.18.0" />
+    <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="3.1.1" />
     <PackageReference Include="System.Diagnostics.Process" Version="4.3.0" />
     <PackageReference Include="Colors.Net" Version="1.1.0" />
     <PackageReference Include="McMaster.Extensions.CommandLineUtils" Version="2.2.5" />