private List <string> GetNotificationArns(DeployStackContext context)
{
return(context.NotificationArn != null ? new List <string> {
context.NotificationArn
} : new List <string> {
});
}
private async Task <bool> DoesStackExist(DeployStackContext context, IAmazonCloudFormation cloudformationClient)
{
try
{ // if this throws, assume the stack does not exist.
var describeStacksRequest = new DescribeStacksRequest {
StackName = context.StackName
};
var describeStacksResponse = await cloudformationClient.DescribeStacksAsync(describeStacksRequest);
logger.LogInformation($"Got describe stacks response: {Serialize(describeStacksResponse)}");
return(describeStacksResponse.Stacks.Count() != 0);
}
catch (Exception e)
{
logger.LogError($"Describe stacks failure: {e.Message}\n{e.StackTrace}");
}
return(false);
}
public virtual async Task Deploy(DeployStackContext context)
{
var cloudformationClient = await cloudformationFactory.Create(context.RoleArn);
var notificationArns = GetNotificationArns(context);
var stackExists = await DoesStackExist(context, cloudformationClient);
var parameters = (List <Parameter>)context.Parameters ?? new List <Parameter> {
};
var capabilities = (List <string>)context.Capabilities ?? new List <string> {
};
var tags = (List <Tag>)context.Tags ?? new List <Tag> {
};
if (!stackExists)
{
var createStackRequest = new CreateStackRequest
{
StackName = context.StackName,
TemplateBody = context.Template,
Parameters = parameters,
Capabilities = capabilities,
Tags = tags,
NotificationARNs = notificationArns,
RoleARN = context.PassRoleArn,
ClientRequestToken = context.ClientRequestToken,
OnFailure = DELETE
};
var createStackResponse = await cloudformationClient.CreateStackAsync(createStackRequest);
logger.LogInformation($"Got create stack response: {Serialize(createStackResponse)}");
}
else
{
var updateStackRequest = new UpdateStackRequest
{
StackName = context.StackName,
TemplateBody = context.Template,
Parameters = parameters,
Capabilities = capabilities,
Tags = tags,
NotificationARNs = notificationArns,
ClientRequestToken = context.ClientRequestToken,
RoleARN = context.PassRoleArn
};
try
{
var updateStackResponse = await cloudformationClient.UpdateStackAsync(updateStackRequest);
logger.LogInformation($"Got update stack response: {Serialize(updateStackResponse)}");
}
catch (Exception e)
{
if (e.Message == "No updates are to be performed.")
{
throw new NoUpdatesException(e.Message);
}
else
{
throw e;
}
}
}
}