static void Main(string[] args)
{
var authotizationInfo = new AzureProviderAuthorization
{
AuthorizationServiceUrl = "https://login.microsoftonline.com/{{tenantId}}/oauth2/token",
TenandId = "<From Azure AD>",
ClientId = "<From RBAC Service Principal AppId>",
ClientSecret = "<From RBAC Service Principal>"
};
var jwt = GetJwt(authotizationInfo).Result;
var apimConfiguration = new AzureApiManagementGatewayConfiguration
{
ApiManagementGatewayName = "hwt-apim-westus-triage",
ResourceGroupName = "hwt-rg-westus-triage",
SubscriptionId = "<From Azure Portal Subscription Id>"
};
var productionApiName = "hwt-api-westus-triage";
var stagingApiName = "hwt-api-stage-westus-triage";
var oldApiName = "hwt-api-old-westus-triage";
var productionApiPolicyXml = GetCurrentPolicy(apimConfiguration, jwt, productionApiName).Result;
var stagingApiPolicyXml = GetCurrentPolicy(apimConfiguration, jwt, stagingApiName).Result;
var oldApiPolicyXml = GetCurrentPolicy(apimConfiguration, jwt, oldApiName).Result;
var productionBackendId = GetExistingBackendId(productionApiPolicyXml);
var stagingBackendId = GetExistingBackendId(stagingApiPolicyXml);
var oldBackendId = GetExistingBackendId(oldApiPolicyXml);
// Iterate over a period of time and increase the percentage of traffic to the new backend.
var newCanaryPolicy = GetCanaryPolicy(productionApiPolicyXml, 70, productionBackendId, stagingBackendId);
var setCanaryPolicy = SetPolicy(apimConfiguration, jwt, productionApiName, newCanaryPolicy).Result;
// At the end of the process, rearrange the pointers so that:
// 1) The Staging gets promoted to Production.
// 2) Production gets demoted to Old.
// 3) Old gets switched to Staging.
var newPolicyForProduction = GetSingleBackendPolicy(productionApiPolicyXml, stagingBackendId);
var newPolicyForOld = GetSingleBackendPolicy(oldApiPolicyXml, productionBackendId);
var newPolicyForStaging = GetSingleBackendPolicy(stagingApiPolicyXml, oldBackendId);
var setProductionPolicy = SetPolicy(apimConfiguration, jwt, productionApiName, newPolicyForProduction).Result;
var setStagingPolicy = SetPolicy(apimConfiguration, jwt, stagingApiName, newPolicyForStaging).Result;
var setOldPolicy = SetPolicy(apimConfiguration, jwt, oldApiName, newPolicyForOld).Result;
}
public static async Task <string> GetCurrentPolicy(AzureApiManagementGatewayConfiguration config, string jwt, string apiName)
{
var getPolicyUrl = $"https://management.azure.com/subscriptions/{config.SubscriptionId}/resourceGroups/{config.ResourceGroupName}/providers/Microsoft.ApiManagement/service/{config.ApiManagementGatewayName}/apis/{apiName}/policies/policy?api-version=2019-01-01";
using (var request = new HttpRequestMessage {
RequestUri = new Uri(getPolicyUrl)
})
{
request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", jwt);
request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xml"));
using (var response = await HttpClient.SendAsync(request))
{
return(response.IsSuccessStatusCode ? (await response.Content.ReadAsStringAsync()) : null);
}
}
}
public static async Task <bool> SetPolicy(AzureApiManagementGatewayConfiguration config, string jwt, string apiName, string xmlPolicy)
{
var url = $"https://management.azure.com/subscriptions/{config.SubscriptionId}/resourceGroups/{config.ResourceGroupName}/providers/Microsoft.ApiManagement/service/{config.ApiManagementGatewayName}/apis/{apiName}/policies/policy?api-version=2019-01-01";
var requestBody = JsonConvert.SerializeObject(new
{
properties = new
{
format = "xml",
value = xmlPolicy
}
});
using (var request = new HttpRequestMessage {
RequestUri = new Uri(url), Method = HttpMethod.Put, Content = new StringContent(requestBody, Encoding.UTF8, "application/json")
})
{
request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", jwt);
using (var response = await HttpClient.SendAsync(request))
{
return(response.IsSuccessStatusCode);
}
}
}