Migrating API Gateway from Ocelot to YARP

This guide provides guidance for migrating your existing microservice application's API Gateway from Ocelot to YARP. Since YARP is available with ABP v8.0+, you will need to update your existing application in order to apply YARP changes.

History

Until this version, ABP Commercial was using the Ocelot for the API Gateway, in the Microservice Startup Template. Since the Ocelot library is not actively maintained, we have searched for an alternative and decided to switch from Ocelot to YARP for the API Gateway. YARP is maintained by Microsoft and is actively being developed and seems a better alternative than Ocelot and provides the same feature stack and even more.

YARP Migration Steps

You should update various files in different projects to upgrade your the API Gateway from Ocelot to YARP. All of the required changes are listed below in different sections, please apply the following steps to upgrade from Ocelot to YARP.

Alternatively, you can create a Microservice Startup Template and compare your changes with the microservice template. It's recommended approach to ensure all the required changes have been done.

Shared Hosting Gateways Project

  • Remove the Ocelot packages and add YARP packages as follows:
    <ItemGroup>
-        <PackageReference Include="Ocelot" Version="17.0.0" />
-        <PackageReference Include="Ocelot.Provider.Polly" Version="17.0.0" />
+        <PackageReference Include="Yarp.ReverseProxy" Version="2.0.0" />
    </ItemGroup>
  • Open the *SharedHostingGatewaysModule.cs and make the following changes:
    public override void ConfigureServices(ServiceConfigurationContext context)
    {
        var configuration = context.Services.GetConfiguration();
        var env = context.Services.GetHostingEnvironment();

-      var ocelotBuilder = context.Services.AddOcelot(configuration)
-           .AddPolly();

-       if (!env.IsProduction())
-       {
-           ocelotBuilder.AddDelegatingHandler<AbpRemoveCsrfCookieHandler>(true);
-       }

+       context.Services.AddReverseProxy()
+           .LoadFromConfig(configuration.GetSection("ReverseProxy"));
    }
  • Update the GatewayHostBuilderExtensions.cs file as follows:
using Microsoft.Extensions.Configuration;

namespace Microsoft.Extensions.Hosting;

public static class AbpHostingHostBuilderExtensions
{
    public const string AppYarpJsonPath = "yarp.json";

    public static IHostBuilder AddYarpJson(
        this IHostBuilder hostBuilder,
        bool optional = true,
        bool reloadOnChange = true,
        string path = AppYarpJsonPath)
    {
        return hostBuilder.ConfigureAppConfiguration((_, builder) =>
        {
            builder.AddJsonFile(
                path: AppYarpJsonPath,
                optional: optional,
                reloadOnChange: reloadOnChange
            );
        });
    }
}
  • Delete the OcelotConfiguration.cs file from the solution.

Public Web Gateway Project

  • Remove the ocelot.json file and instead create a new yarp.json file and update its content as follows (in the root directory of the PublicWebGateway project):
{
  "ReverseProxy": {
    "Routes": {
      "AbpApi": {
        "ClusterId": "Administration",
        "Match": {
          "Path": "/api/abp/{**catch-all}"
        }
      },
      "AdministrationSwagger": {
        "ClusterId": "Administration",
        "Match": {
          "Path": "/swagger-json/Administration/swagger/v1/swagger.json"
        },
        "Transforms": [
          {
            "PathRemovePrefix": "/swagger-json/Administration"
          }
        ]
      },
      "Account": {
        "ClusterId": "AuthServer",
        "Match": {
          "Path": "/api/account/{**catch-all}"
        }
      },
      "AuthServerSwagger": {
        "ClusterId": "AuthServer",
        "Match": {
          "Path": "/swagger-json/AuthServer/swagger/v1/swagger.json"
        },
        "Transforms": [
          {
            "PathRemovePrefix": "/swagger-json/AuthServer"
          }
        ]
      },
      "Product": {
        "ClusterId": "Product",
        "Match": {
          "Path": "/api/product-service/{**catch-all}"
        }
      },
      "ProductSwagger": {
        "ClusterId": "Product",
        "Match": {
          "Path": "/swagger-json/Product/swagger/v1/swagger.json"
        },
        "Transforms": [
          {
            "PathRemovePrefix": "/swagger-json/Product"
          }
        ]
      }
    },
    "Clusters": {
      "AuthServer": {
        "Destinations": {
          "AuthServer": {
            "Address": "https://localhost:44322/"
          }
        }
      },
      "Administration": {
        "Destinations": {
          "Administration": {
            "Address": "https://localhost:44367/"
          }
        }
      },
      "Product": {
        "Destinations": {
          "Product": {
            "Address": "https://localhost:44361/"
          }
        }
      }
    }
  }
}
  • Open the Program.cs file and make the following changes:
    builder.Host
        .AddAppSettingsSecretsJson()
-       .AddOcelotJson()
+       .AddYarpJson() 
        .UseAutofac()
        .UseSerilog();
  • Open the module class of the PublicWebGateway project and update the OnApplicationInitialization method as follows:
+   using Yarp.ReverseProxy.Configuration;
    
    //other configurations...
    
    public override void OnApplicationInitialization(ApplicationInitializationContext context)
    {
        var app = context.GetApplicationBuilder();
        var env = context.GetEnvironment();
        var configuration = context.GetConfiguration();
+       var proxyConfig = app.ApplicationServices.GetRequiredService<IProxyConfigProvider>().GetConfig();

        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseCorrelationId();
        app.UseStaticFiles();
+       app.UseCors();
+       app.UseRouting();
+       app.UseAuthorization();
        app.UseSwagger();
+       app.UseAbpSwaggerUI(options => { ConfigureSwaggerUI(proxyConfig, options, configuration); });
        app.UseAbpSerilogEnrichers();
+       app.UseRewriter(CreateSwaggerRewriteOptions());
        app.UseEndpoints(endpoints => endpoints.MapReverseProxy());
    }

+    private static void ConfigureSwaggerUI(
+        IProxyConfig proxyConfig,
+        SwaggerUIOptions options,
+        IConfiguration configuration)
+    {
+        foreach (var cluster in proxyConfig.Clusters)
+        {
+            options.SwaggerEndpoint($"/swagger-json/{cluster.ClusterId}/swagger/v1/swagger.json", $"{cluster.ClusterId} API");
+        }

+        options.OAuthClientId(configuration["AuthServer:SwaggerClientId"]);
+        options.OAuthScopes(
+            "AdministrationService",
+            "AccountService",
+            "ProductService"
+        );
+    }

+    private static RewriteOptions CreateSwaggerRewriteOptions()
+    {
+        var rewriteOptions = new RewriteOptions();
+        rewriteOptions.AddRedirect("^(|\\|\\s+)$", "/swagger"); // Regex for "/" and "" (whitespace)
+        return rewriteOptions;
+    }

Web Gateway Project

  • Remove the ocelot.json file and instead create a new yarp.json file and update its content as follows (in the root directory of the WebGateway project):
{
  "ReverseProxy": {
    "Routes": {
      "AbpApi": {
        "ClusterId": "Administration",
        "Match": {
          "Path": "/api/abp/{**catch-all}"
        }
      },
      "SettingManagement": {
        "ClusterId": "Administration",
        "Match": {
          "Path": "/api/setting-management/{**catch-all}"
        }
      },
      "FeatureManagement": {
        "ClusterId": "Administration",
        "Match": {
          "Path": "/api/feature-management/{**catch-all}"
        }
      },
      "PermissionManagement": {
        "ClusterId": "Administration",
        "Match": {
          "Path": "/api/permission-management/{**catch-all}"
        }
      },
      "AuditLogging": {
        "ClusterId": "Administration",
        "Match": {
          "Path": "/api/audit-logging/{**catch-all}"
        }
      },
      "LanguageManagement": {
        "ClusterId": "Administration",
        "Match": {
          "Path": "/api/language-management/{**catch-all}"
        }
      },
      "TextTemplateManagement": {
        "ClusterId": "Administration",
        "Match": {
          "Path": "/api/text-template-management/{**catch-all}"
        }
      },
      "LeptonThemeManagement": {
        "ClusterId": "Administration",
        "Match": {
          "Path": "/api/lepton-theme-management/{**catch-all}"
        }
      },
      "GDPR": {
        "ClusterId": "Administration",
        "Match": {
          "Path": "/api/gdpr/{**catch-all}"
        }
      },
      "AdministrationSwagger": {
        "ClusterId": "Administration",
        "Match": {
          "Path": "/swagger-json/Administration/swagger/v1/swagger.json"
        },
        "Transforms": [
          { "PathRemovePrefix": "/swagger-json/Administration" }
        ]
      },
      "Account": {
        "ClusterId": "AuthServer",
        "Match": {
          "Path": "/api/account/{**catch-all}"
        }
      },
      "AccountAdmin": {
        "ClusterId": "AuthServer",
        "Match": {
          "Path": "/api/account-admin/{**catch-all}"
        }
      },
      "AuthServerSwagger": {
        "ClusterId": "AuthServer",
        "Match": {
          "Path": "/swagger-json/AuthServer/swagger/v1/swagger.json"
        },
        "Transforms": [
          { "PathRemovePrefix": "/swagger-json/AuthServer" }
        ]
      },
      "Identity": {
        "ClusterId": "Identity",
        "Match": {
          "Path": "/api/identity/{**catch-all}"
        }
      },
      "OpenIddict": {
        "ClusterId": "Identity",
        "Match": {
          "Path": "/api/openiddict/{**catch-all}"
        }
      },
      "IdentitySwagger": {
        "ClusterId": "Identity",
        "Match": {
          "Path": "/swagger-json/Identity/swagger/v1/swagger.json"
        },
        "Transforms": [
          { "PathRemovePrefix": "/swagger-json/Identity" }
        ]
      },
      "Saas": {
        "ClusterId": "Saas",
        "Match": {
          "Path": "/api/saas/{**catch-all}"
        }
      },
      "Payment": {
        "ClusterId": "Saas",
        "Match": {
          "Path": "/api/payment/{**catch-all}"
        }
      },
      "PaymentAdmin": {
        "ClusterId": "Saas",
        "Match": {
          "Path": "/api/payment-admin/{**catch-all}"
        }
      },
      "SaasSwagger": {
        "ClusterId": "Saas",
        "Match": {
          "Path": "/swagger-json/Saas/swagger/v1/swagger.json"
        },
        "Transforms": [
          { "PathRemovePrefix": "/swagger-json/Saas" }
        ]
      },
      "Product": {
        "ClusterId": "Product",
        "Match": {
          "Path": "/api/product-service/{**catch-all}"
        }
      },
      "ProductSwagger": {
        "ClusterId": "Product",
        "Match": {
          "Path": "/swagger-json/Product/swagger/v1/swagger.json"
        },
        "Transforms": [
          { "PathRemovePrefix": "/swagger-json/Product" }
        ]
      }
    },
    "Clusters": {
      "AuthServer": {
        "Destinations": {
          "AuthServer": {
            "Address": "https://localhost:44322/"
          }
        }
      },
      "Administration": {
        "Destinations": {
          "Administration": {
            "Address": "https://localhost:44367/"
          }
        }
      },
      "Identity": {
        "Destinations": {
          "Identity": {
            "Address": "https://localhost:44388/"
          }
        }
      },
      "Saas": {
        "Destinations": {
          "Saas": {
            "Address": "https://localhost:44381/"
          }
        }
      },
      "Product": {
        "Destinations": {
          "Product": {
            "Address": "https://localhost:44361/"
          }
        }
      }
    }
  }
}
  • Open the Program.cs file and make the change in the below:
    builder.Host
        .AddAppSettingsSecretsJson()
-       .AddOcelotJson()
+       .AddYarpJson() 
        .UseAutofac()
        .UseSerilog();
  • Open the module class of the WebGateway project and update the OnApplicationInitialization method as follows:
+   using Yarp.ReverseProxy.Configuration;
    
    //other configurations...
    
    public override void OnApplicationInitialization(ApplicationInitializationContext context)
    {
        var app = context.GetApplicationBuilder();
        var env = context.GetEnvironment();
        var configuration = context.GetConfiguration();
+       var proxyConfig = app.ApplicationServices.GetRequiredService<IProxyConfigProvider>().GetConfig();

        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseCorrelationId();
        app.UseStaticFiles();
+       app.UseCors();
+       app.UseRouting();
+       app.UseAuthorization();
        app.UseSwagger();
+       app.UseAbpSwaggerUI(options => { ConfigureSwaggerUI(proxyConfig, options, configuration); });
        app.UseAbpSerilogEnrichers();
+       app.UseRewriter(CreateSwaggerRewriteOptions());
        app.UseEndpoints(endpoints => endpoints.MapReverseProxy());
    }

+    private static void ConfigureSwaggerUI(
+        IProxyConfig proxyConfig,
+        SwaggerUIOptions options,
+        IConfiguration configuration)
+    {
+        foreach (var cluster in proxyConfig.Clusters)
+        {
+            options.SwaggerEndpoint($"/swagger-json/{cluster.ClusterId}/swagger/v1/swagger.json", $"{cluster.ClusterId} API");
+        }

+        options.OAuthClientId(configuration["AuthServer:SwaggerClientId"]);
+        options.OAuthScopes(
+            "AdministrationService",
+            "AccountService",
+            "IdentityService",
+            "SaasService",
+            "ProductService"
+        );
+    }

+    private static RewriteOptions CreateSwaggerRewriteOptions()
+    {
+        var rewriteOptions = new RewriteOptions();
+        rewriteOptions.AddRedirect("^(|\\|\\s+)$", "/swagger"); // Regex for "/" and "" (whitespace)
+        return rewriteOptions;
+    }

Chart Updates

  • Update the gateway-web-public-configmap.yaml as follows (etc/k8s//charts/gateway-web-public/templates/gateway-web-public-configmap.yaml):
apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-{{ .Chart.Name }}-configmap
data:
  yarp.json: |-
    {
      "ReverseProxy": {
        "Routes": {
          "AbpApi": {
            "ClusterId": "Administration",
            "Match": {
              "Path": "/api/abp/{**catch-all}"
            }
          },
          "AdministrationSwagger": {
            "ClusterId": "Administration",
            "Match": {
              "Path": "/swagger-json/Administration/swagger/v1/swagger.json"
            },
            "Transforms": [
              { "PathRemovePrefix": "/swagger-json/Administration" }
            ]
          },
          "Account": {
            "ClusterId": "AuthServer",
            "Match": {
              "Path": "/api/account/{**catch-all}"
            }
          },
          "AuthServerSwagger": {
            "ClusterId": "AuthServer",
            "Match": {
              "Path": "/swagger-json/AuthServer/swagger/v1/swagger.json"
            },
            "Transforms": [
              { "PathRemovePrefix": "/swagger-json/AuthServer" }
            ]
          },
          "Product": {
            "ClusterId": "Product",
            "Match": {
              "Path": "/api/product-service/{**catch-all}"
            }
          },
          "ProductSwagger": {
            "ClusterId": "Product",
            "Match": {
              "Path": "/swagger-json/Product/swagger/v1/swagger.json"
            },
            "Transforms": [
              { "PathRemovePrefix": "/swagger-json/Product" }
            ]
          }
        },
        "Clusters": {
          "AuthServer": {
            "Destinations": {
              "AuthServer": {
                "Address": "{{ .Values.reRoutes.accountService.url }}"
              }
            }
          },
          "Administration": {
            "Destinations": {
              "Administration": {
                "Address": "{{ .Values.reRoutes.administrationService.url }}"
              }
            }
          },
          "Product": {
            "Destinations": {
              "Product": {
                "Address": "{{ .Values.reRoutes.productService.url }}"
              }
            }
          }
        }
      }
    }
  • Make the following changes in the gateway-web-public-deployment.yaml file (etc/k8s//charts/gateway-web-public/templates/gateway-web-public-deployment.yaml):
-          mountPath: /app/ocelot.json
+          mountPath: /app/yarp.json
-          subPath: ocelot.json
+          subPath: yarp.json
  • Update the values.yaml file as follows (etc/k8s//charts/gateway-web-public/values.yaml):
config:
  selfUrl: # https://gateway-public.myprojectname.dev
  corsOrigins: # https://myprojectname-st-gateway-web,https://myprojectname-st-gateway-public-web
  authServer:
    authority: # http://myprojectname-st-authserver
    requireHttpsMetadata: # "false"
    metadataAddress: # https://authserver.myprojectname.dev/.well-known/openid-configuration
    swaggerClientId: # WebGateway_Swagger
  dotnetEnv: Staging 
  redisHost: #
  rabbitmqHost: #
  elasticsearchUrl: #
  AbpLicenseCode: #

reRoutes:
  accountService:
    url: http://myprojectname-st-authserver
  saasService:
    url: http://saas-st-administration
  administrationService:
    url: http://myprojectname-st-administration
  productService:
    url: http://myprojectname-st-product

ingress:
  host: gateway-public.myprojectname.dev
  tlsSecret: myprojectname-tls

image:
  repository: mycompanyname/myprojectname-gateway-web-public
  tag: latest
  pullPolicy: IfNotPresent

env: {}
  • Update the gateway-web-configmap.yaml as follows (etc/k8s//charts/gateway-web/templates/gateway-web-configmap.yaml):
apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-{{ .Chart.Name }}-configmap
data:
  yarp.json: |-
    {
      "ReverseProxy": {
        "Routes": {
          "AbpApi": {
            "ClusterId": "Administration",
            "Match": {
              "Path": "/api/abp/{**catch-all}"
            }
          },
          "SettingManagement": {
            "ClusterId": "Administration",
            "Match": {
              "Path": "/api/setting-management/{**catch-all}"
            }
          },
          "FeatureManagement": {
            "ClusterId": "Administration",
            "Match": {
              "Path": "/api/feature-management/{**catch-all}"
            }
          },
          "PermissionManagement": {
            "ClusterId": "Administration",
            "Match": {
              "Path": "/api/permission-management/{**catch-all}"
            }
          },
          "AuditLogging": {
            "ClusterId": "Administration",
            "Match": {
              "Path": "/api/audit-logging/{**catch-all}"
            }
          },
          "LanguageManagement": {
            "ClusterId": "Administration",
            "Match": {
              "Path": "/api/language-management/{**catch-all}"
            }
          },
          "TextTemplateManagement": {
            "ClusterId": "Administration",
            "Match": {
              "Path": "/api/text-template-management/{**catch-all}"
            }
          },
          "LeptonThemeManagement": {
            "ClusterId": "Administration",
            "Match": {
              "Path": "/api/lepton-theme-management/{**catch-all}"
            }
          },
          "GDPR": {
            "ClusterId": "Administration",
            "Match": {
              "Path": "/api/gdpr/{**catch-all}"
            }
          },
          "AdministrationSwagger": {
            "ClusterId": "Administration",
            "Match": {
              "Path": "/swagger-json/Administration/swagger/v1/swagger.json"
            },
            "Transforms": [
              { "PathRemovePrefix": "/swagger-json/Administration" }
            ]
          },
          "Account": {
            "ClusterId": "AuthServer",
            "Match": {
              "Path": "/api/account/{**catch-all}"
            }
          },
          "AccountAdmin": {
            "ClusterId": "AuthServer",
            "Match": {
              "Path": "/api/account-admin/{**catch-all}"
            }
          },
          "AuthServerSwagger": {
            "ClusterId": "AuthServer",
            "Match": {
              "Path": "/swagger-json/AuthServer/swagger/v1/swagger.json"
            },
            "Transforms": [
              { "PathRemovePrefix": "/swagger-json/AuthServer" }
            ]
          },
          "Identity": {
            "ClusterId": "Identity",
            "Match": {
              "Path": "/api/identity/{**catch-all}"
            }
          },
          "OpenIddict": {
            "ClusterId": "Identity",
            "Match": {
              "Path": "/api/openiddict/{**catch-all}"
            }
          },
          "IdentitySwagger": {
            "ClusterId": "Identity",
            "Match": {
              "Path": "/swagger-json/Identity/swagger/v1/swagger.json"
            },
            "Transforms": [
              { "PathRemovePrefix": "/swagger-json/Identity" }
            ]
          },
          "Saas": {
            "ClusterId": "Saas",
            "Match": {
              "Path": "/api/saas/{**catch-all}"
            }
          },
          "Payment": {
            "ClusterId": "Saas",
            "Match": {
              "Path": "/api/payment/{**catch-all}"
            }
          },
          "PaymentAdmin": {
            "ClusterId": "Saas",
            "Match": {
              "Path": "/api/payment-admin/{**catch-all}"
            }
          },
          "SaasSwagger": {
            "ClusterId": "Saas",
            "Match": {
              "Path": "/swagger-json/Saas/swagger/v1/swagger.json"
            },
            "Transforms": [
              { "PathRemovePrefix": "/swagger-json/Saas" }
            ]
          },
          "Product": {
            "ClusterId": "Product",
            "Match": {
              "Path": "/api/product-service/{**catch-all}"
            }
          },
          "ProductSwagger": {
            "ClusterId": "Product",
            "Match": {
              "Path": "/swagger-json/Product/swagger/v1/swagger.json"
            },
            "Transforms": [
              { "PathRemovePrefix": "/swagger-json/Product" }
            ]
          }
        },
        "Clusters": {
          "AuthServer": {
            "Destinations": {
              "AuthServer": {
                "Address": "{{ .Values.reRoutes.accountService.url }}"
              }
            }
          },
          "Administration": {
            "Destinations": {
              "Administration": {
                "Address": "{{ .Values.reRoutes.administrationService.url }}"
              }
            }
          },
          "Identity": {
            "Destinations": {
              "Identity": {
                "Address": "{{ .Values.reRoutes.identityService.url }}"
              }
            }
          },
          "Saas": {
            "Destinations": {
              "Saas": {
                "Address": "{{ .Values.reRoutes.saasService.url }}"
              }
            }
          },
          "Product": {
            "Destinations": {
              "Product": {
                "Address": "{{ .Values.reRoutes.productService.url }}"
              }
            }
          }
        }
      }
    }
  • Make the following changes in the gateway-web-deployment.yaml file (etc/k8s//charts/gateway-web/templates/gateway-web-deployment.yaml):
-          mountPath: /app/ocelot.json
+          mountPath: /app/yarp.json
-          subPath: ocelot.json
+          subPath: yarp.json
  • Update the values.yaml file as follows (etc/k8s//charts/gateway-web/values.yaml):
config:
  selfUrl: # https://gateway-web.myprojectname.dev
  corsOrigins: # https://myprojectname-st-angular
  globalConfigurationBaseUrl: # http://myprojectname-st-gateway-web
  authServer:
    authority: # http://myprojectname-st-authserver
    requireHttpsMetadata: # "false"
    metadataAddress: # https://authserver.myprojectname.dev/.well-known/openid-configuration
    swaggerClientId: # WebGateway_Swagger
  dotnetEnv: # 
  redisHost: #
  rabbitmqHost: #
  elasticsearchUrl: #
  AbpLicenseCode: #
  
reRoutes:
  accountService:
    url: http://myprojectname-st-authserver
  saasService:
    url: http://saas-st-administration
  administrationService:
    url: http://myprojectname-st-administration
  identityService:
    url: http://myprojectname-st-identity
  productService:
    url: http://myprojectname-st-product
ingress:
  host: # gateway-web.myprojectname.dev
  tlsSecret: myprojectname-tls

image:
  repository: mycompanyname/myprojectname-gateway-web
  tag: latest
  pullPolicy: IfNotPresent

env: {}
  • Update the values.yaml file as follows (etc/k8s//values.yaml):
- globalConfigurationBaseUrl: http://myprojectname-st-gateway-web

reRoutes:
    accountService:
+      url: http://myprojectname-st-authserver
-      dns: https://authserver.myprojectname.dev
-      schema: http
-      host: myprojectname-st-authserver
-      port: 80
    identityService:
+      url: http://myprojectname-st-identity
-      dns: https://identity.myprojectname.dev
-      schema: http
-      host: myprojectname-st-identity
-      port: 80
    administrationService:
+      url: http://myprojectname-st-administration
-      dns: https://administration.myprojectname.dev
-      schema: http
-      host: myprojectname-st-administration
-      port: 80
    saasService:
+      url: http://myprojectname-st-saas
-      dns: https://saas.myprojectname.dev
-      schema: http
-      host: myprojectname-st-saas
-      port: 80
    productService:
+      url: http://myprojectname-st-product
-      dns: https://product.myprojectname.dev
-      schema: http
-      host: myprojectname-st-product
-      port: 80

See Also

Contributors

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