/// <summary>
/// Gets the last stack event by timestamp, optionally filtered by a predicate
/// </summary>
/// <param name="predicate">The optional predicate used to filter events</param>
/// <returns>The stack event</returns>
public static async Task <Maybe <StackEvent> > GetLastStackEvent(this Func <IAmazonCloudFormation> clientFactory,
StackArn stack,
Func <StackEvent, bool> predicate = null)
{
try
{
var response = await clientFactory().DescribeStackEventsAsync(new DescribeStackEventsRequest {
StackName = stack.Value
});
return(response?
.StackEvents.OrderByDescending(stackEvent => stackEvent.Timestamp)
.FirstOrDefault(stackEvent => predicate == null || predicate(stackEvent))
.AsSome());
}
catch (AmazonCloudFormationException ex) when(ex.ErrorCode == "AccessDenied")
{
throw new PermissionException(
"The AWS account used to perform the operation does not have the required permissions to query the current state of the CloudFormation stack. " +
"This step will complete without waiting for the stack to complete, and will not fail if the stack finishes in an error state.\n " +
"Please ensure the current account has permission to perform action 'cloudformation:DescribeStackEvents'" +
ex.Message);
}
catch (AmazonCloudFormationException)
{
return(Maybe <StackEvent> .None);
}
}
/// <summary>
/// Wait for a given stack to complete by polling the stack events
/// </summary>
/// <param name="clientFactory">The client factory method to use</param>
/// <param name="waitPeriod">The period to wait between events</param>
/// <param name="stack">The stack name or id to query</param>
/// param name="action">Callback for each event while waiting
/// <param name="filter">The predicate for filtering the stack events</param>
public static async Task WaitForStackToComplete(this Func <IAmazonCloudFormation> clientFactory,
TimeSpan waitPeriod, StackArn stack, Action <Maybe <StackEvent> > action = null, Func <StackEvent, bool> filter = null)
{
Guard.NotNull(stack, "Stack should not be null");
Guard.NotNull(clientFactory, "Client factory should not be null");
var status = await clientFactory.StackExistsAsync(stack, StackStatus.DoesNotExist);
if (status == StackStatus.DoesNotExist || status == StackStatus.Completed)
{
return;
}
do
{
await Task.Delay(waitPeriod);
var @event = await clientFactory.GetLastStackEvent(stack, filter);
action?.Invoke(@event);
} while (await clientFactory.StackExistsAsync(stack, StackStatus.Completed) == StackStatus.InProgress);
/*
* The action here logs the event and throws an exception if the event indicates failure. There is a possibility
* that between the calls to "clientFactory.GetLastStackEvent" and "clientFactory.StackExistsAsync" above
* the stack completed but entered an error state that is not detected. Getting the last event after the stack is
* in a completed state ensures we catch any errors.
*/
var lastStackEvent = await clientFactory.GetLastStackEvent(stack, filter);
action?.Invoke(lastStackEvent);
}
public static Task <DescribeChangeSetResponse> DescribeChangeSetAsync(this Func <IAmazonCloudFormation> factory,
StackArn stack, ChangeSetArn changeSet)
{
return(factory().DescribeChangeSetAsync(new DescribeChangeSetRequest
{
ChangeSetName = changeSet.Value,
StackName = stack.Value
}));
}
public static DescribeChangeSetResponse DescribeChangeSet(this Func <IAmazonCloudFormation> factory,
StackArn stack, ChangeSetArn changeSet)
{
return(factory().Map(client => client.DescribeChangeSet(new DescribeChangeSetRequest
{
ChangeSetName = changeSet.Value,
StackName = stack.Value
})));
}
/// <summary>
/// Wait for a given stack to complete by polling the stack events
/// </summary>
/// <param name="clientFactory">The client factory method to use</param>
/// <param name="waitPeriod">The period to wait between events</param>
/// <param name="stack">The stack name or id to query</param>
/// param name="action">Callback for each event while waiting
/// <param name="filter">The predicate for filtering the stack events</param>
public static void WaitForStackToComplete(this Func <IAmazonCloudFormation> clientFactory,
TimeSpan waitPeriod, StackArn stack, Action <Maybe <StackEvent> > action = null, Func <StackEvent, bool> filter = null)
{
Guard.NotNull(stack, "Stack should not be null");
Guard.NotNull(clientFactory, "Client factory should not be null");
var status = clientFactory.StackExists(stack, StackStatus.DoesNotExist);
if (status == StackStatus.DoesNotExist || status == StackStatus.Completed)
{
return;
}
do
{
Thread.Sleep(waitPeriod);
var @event = clientFactory.GetLastStackEvent(stack, filter);
action?.Invoke(@event);
} while (clientFactory.StackExists(stack, StackStatus.Completed) == StackStatus.InProgress);
}
public static Task <DeleteStackResponse> DeleteStackAsync(this Func <IAmazonCloudFormation> clientFactory, StackArn stack)
{
Guard.NotNull(clientFactory, "clientFactory should not be null");
Guard.NotNull(stack, "Stack should not be null");
try
{
return(clientFactory().DeleteStackAsync(new DeleteStackRequest {
StackName = stack.Value
}));
}
catch (AmazonCloudFormationException ex) when(ex.ErrorCode == "AccessDenied")
{
throw new PermissionException(
"The AWS account used to perform the operation does not have the required permissions to delete the stack.\n" +
"Please ensure the current account has permission to perform action 'cloudformation:DeleteStack'.\n" +
ex.Message
);
}
}
/// <summary>
/// Check to see if the stack name exists.
/// </summary>
/// <param name="clientFactory">The client factory method</param>
/// <param name="stackArn">The stack name or id</param>
/// <param name="defaultValue">The default value to return given no permission to query the stack</param>
/// <returns>The current status of the stack</returns>
public static async Task <StackStatus> StackExistsAsync(this Func <IAmazonCloudFormation> clientFactory, StackArn stackArn,
StackStatus defaultValue)
{
try
{
var result = await clientFactory.DescribeStackAsync(stackArn);
if (result == null)
{
return(StackStatus.DoesNotExist);
}
if (result.StackStatus == null ||
result.StackStatus.Value.EndsWith("_COMPLETE") ||
result.StackStatus.Value.EndsWith("_FAILED"))
{
return(StackStatus.Completed);
}
return(StackStatus.InProgress);
}
catch (AmazonCloudFormationException ex) when(ex.ErrorCode == "AccessDenied")
{
return(defaultValue);
}
catch (AmazonCloudFormationException ex) when(ex.ErrorCode == "ValidationError")
{
return(StackStatus.DoesNotExist);
}
}
/// <summary>
/// Describe the stack
/// </summary>
/// <param name="clientFactory"></param>
/// <param name="stack"></param>
/// <returns></returns>
public static async Task <Stack> DescribeStackAsync(this Func <IAmazonCloudFormation> clientFactory, StackArn stack)
{
var response = await clientFactory().DescribeStacksAsync(new DescribeStacksRequest {
StackName = stack.Value
});
return(response.Stacks.FirstOrDefault());
}
public RunningChangeSet(StackArn stack, ChangeSetArn changeSet)
{
Stack = stack;
ChangeSet = changeSet;
}
public static DeleteStackResponse DeleteStack(this Func <IAmazonCloudFormation> clientFactory, StackArn stack)
{
Guard.NotNull(clientFactory, "clientFactory should not be null");
Guard.NotNull(stack, "Stack should not be null");
try
{
return(clientFactory().Map(client =>
client.DeleteStack(new DeleteStackRequest {
StackName = stack.Value
})));
}
catch (AmazonCloudFormationException ex)
{
if (ex.ErrorCode == "AccessDenied")
{
throw new PermissionException(
"AWS-CLOUDFORMATION-ERROR-0009: The AWS account used to perform the operation does not have " +
"the required permissions to delete the stack.\n" +
ex.Message + "\n" +
"For more information visit https://g.octopushq.com/AwsCloudFormationDeploy#aws-cloudformation-error-0009");
}
throw new UnknownException(
"AWS-CLOUDFORMATION-ERROR-0010: An unrecognised exception was thrown while deleting a CloudFormation stack.\n" +
"For more information visit https://g.octopushq.com/AwsCloudFormationDeploy#aws-cloudformation-error-0010",
ex);
}
}
/// <summary>
/// Check to see if the stack name exists.
/// </summary>
/// <param name="clientFactory">The client factory method</param>
/// <param name="stackArn">The stack name or id</param>
/// <param name="defaultValue">The default value to return given no permission to query the stack</param>
/// <returns>The current status of the stack</returns>
public static StackStatus StackExists(this Func <IAmazonCloudFormation> clientFactory, StackArn stackArn,
StackStatus defaultValue)
{
try
{
return(clientFactory.DescribeStack(stackArn)
// Does the status indicate that processing has finished?
?.Map(stack => (stack.StackStatus?.Value.EndsWith("_COMPLETE") ?? true) ||
stack.StackStatus.Value.EndsWith("_FAILED"))
.Map(completed => completed ? StackStatus.Completed : StackStatus.InProgress)
?? StackStatus.DoesNotExist);
}
catch (AmazonCloudFormationException ex)
{
if (ex.ErrorCode == "AccessDenied")
{
return(defaultValue);
}
// This is OK, we just return the fact that the stack does not exist.
// While calling describe stacks and catching exceptions seems dirty,
// this is how the stack-exists command on the CLI works:
// https://docs.aws.amazon.com/cli/latest/reference/cloudformation/wait/stack-exists.html
if (ex.ErrorCode == "ValidationError")
{
return(StackStatus.DoesNotExist);
}
throw new UnknownException(
"AWS-CLOUDFORMATION-ERROR-0006: An unrecognised exception was thrown while checking to see if the CloudFormation stack exists.\n" +
"For more information visit https://g.octopushq.com/AwsCloudFormationDeploy#aws-cloudformation-error-0006",
ex);
}
}
/// <summary>
/// Describe the stack
/// </summary>
/// <param name="clientFactory"></param>
/// <param name="stack"></param>
/// <returns></returns>
public static Stack DescribeStack(this Func <IAmazonCloudFormation> clientFactory, StackArn stack)
{
return(clientFactory()
// The client becomes the result of the API call
.Map(client => client.DescribeStacks(new DescribeStacksRequest {
StackName = stack.Value
}))
// Get the first stack
.Map(response => response.Stacks.FirstOrDefault()));
}
/// <summary>
/// Gets the last stack event by timestamp, optionally filtered by a predicate
/// </summary>
/// <param name="predicate">The optional predicate used to filter events</param>
/// <returns>The stack event</returns>
public static Maybe <StackEvent> GetLastStackEvent(this Func <IAmazonCloudFormation> clientFactory, StackArn stack,
Func <StackEvent, bool> predicate = null)
{
try
{
return(clientFactory()
.DescribeStackEvents(new DescribeStackEventsRequest {
StackName = stack.Value
})
.Map(response => response?.StackEvents
.OrderByDescending(stackEvent => stackEvent.Timestamp)
.FirstOrDefault(stackEvent => predicate == null || predicate(stackEvent))
).AsSome());
}
catch (AmazonCloudFormationException ex)
{
if (ex.ErrorCode == "AccessDenied")
{
throw new PermissionException(
"AWS-CLOUDFORMATION-ERROR-0002: The AWS account used to perform the operation does not have " +
"the required permissions to query the current state of the CloudFormation stack. " +
"This step will complete without waiting for the stack to complete, and will not fail if the " +
"stack finishes in an error state.\n" +
ex.Message + "\n" +
"For more information visit https://g.octopushq.com/AwsCloudFormationDeploy#aws-cloudformation-error-0002");
}
return(Maybe <StackEvent> .None);
}
}
/// <summary>
/// Gets all stack events, optionally filtered by a predicate
/// </summary>
/// <param name="predicate">The optional predicate used to filter events</param>
/// <returns>The stack events</returns>
public static async Task <List <Maybe <StackEvent> > > GetStackEvents(this Func <IAmazonCloudFormation> clientFactory,
StackArn stack,
Func <StackEvent, bool> predicate = null)
{
try
{
var currentStackEvents = new List <StackEvent>();
var nextToken = (string)null;
while (true)
{
var response = await clientFactory().DescribeStackEventsAsync(new DescribeStackEventsRequest {
StackName = stack.Value, NextToken = nextToken
});
var stackEvents = response?
.StackEvents.Where(stackEvent => predicate == null || predicate(stackEvent))
.ToList();
currentStackEvents.AddRange(stackEvents);
if (!string.IsNullOrEmpty(response.NextToken))
{
nextToken = response.NextToken; // Get the next page of results
}
else
{
break;
}
}
var results = new List <Maybe <StackEvent> >();
var nestedStackIds = currentStackEvents
.Where(s => s.ResourceType == "AWS::CloudFormation::Stack" && !string.IsNullOrEmpty(s.PhysicalResourceId) && s.PhysicalResourceId != s.StackId)
.Select(s => s.PhysicalResourceId)
.Distinct()
.ToList();
foreach (var nestedStackId in nestedStackIds)
{
var nestedStackEvents = await GetStackEvents(clientFactory, new StackArn(nestedStackId), predicate);
if (nestedStackEvents.Any())
{
results.AddRange(nestedStackEvents);
}
}
results.AddRange(currentStackEvents.Select(s => s.AsSome()));
return(results.OrderBy(s => s.SelectValueOr(e => e.Timestamp, DateTime.MinValue)).ToList());
}
catch (AmazonCloudFormationException ex) when(ex.ErrorCode == "AccessDenied")
{
throw new PermissionException(
"The AWS account used to perform the operation does not have the required permissions to query the current state of the CloudFormation stack. " +
"This step will complete without waiting for the stack to complete, and will not fail if the stack finishes in an error state. " +
"Please ensure the current account has permission to perform action 'cloudformation:DescribeStackEvents'" +
ex.Message);
}
catch (AmazonCloudFormationException ex) when(ex.ErrorCode == "ExpiredToken")
{
throw new PermissionException(ex.Message + ". Please increase the session duration and/or check that the system date and time are set correctly." +
ex.Message);
}
catch (AmazonCloudFormationException)
{
return(new List <Maybe <StackEvent> > {
Maybe <StackEvent> .None
});
}
}