private async Task WaitForChangeSetCreate(string stackId, DeployContext context, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
Console.WriteLine("Waiting for changeset creation to complete...");
var status = ChangeSetStatus.CREATE_PENDING;
var reason = string.Empty;
while (status != ChangeSetStatus.CREATE_COMPLETE)
{
cancellationToken.ThrowIfCancellationRequested();
if (status == ChangeSetStatus.FAILED)
{
throw new Exception($"Change set {context.ChangeSetName} failed: {reason}");
}
await Task.Delay(1000, cancellationToken);
var request = new DescribeChangeSetRequest {
ChangeSetName = context.ChangeSetName, StackName = stackId
};
var response = await cloudformation.DescribeChangeSetAsync(request, cancellationToken);
status = response.Status;
reason = response.StatusReason;
}
}
private async Task <string> CreateChangeSet(DeployContext context, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
var parameters = context.Parameters
.Select((entry) => new Parameter {
ParameterKey = entry.Key, ParameterValue = entry.Value
})
.ToList();
var tags = context.Tags
.Select((entry) => new Tag {
Key = entry.Key, Value = entry.Value
})
.ToList();
var request = new CreateChangeSetRequest
{
StackName = context.StackName,
ChangeSetName = context.ChangeSetName,
ChangeSetType = await GetChangeSetType(context, cancellationToken),
Capabilities = context.Capabilities,
TemplateURL = context.TemplateURL,
Parameters = parameters,
Tags = tags,
};
var response = await cloudformation.CreateChangeSetAsync(request, cancellationToken);
return(response.StackId);
}
/// <summary>
/// Deploys a cloudformation stack.
/// </summary>
/// <param name="context">Context holder for deployment information.</param>
/// <param name="cancellationToken">Token used to cancel the operation.</param>
/// <returns>The resulting task.</returns>
public async Task Deploy(DeployContext context, CancellationToken cancellationToken)
{
var stackId = await CreateChangeSet(context, cancellationToken);
await WaitForChangeSetCreate(stackId, context, cancellationToken);
await ExecuteChangeSet(stackId, context, cancellationToken);
await WaitForChangeSetExecute(stackId, context, cancellationToken);
}
private async Task ExecuteChangeSet(string stackId, DeployContext context, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
var request = new ExecuteChangeSetRequest {
ChangeSetName = context.ChangeSetName, StackName = stackId
};
await cloudformation.ExecuteChangeSetAsync(request, cancellationToken);
}
private async Task <ChangeSetType> GetChangeSetType(DeployContext context, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
try
{
var request = new DescribeStacksRequest {
StackName = context.StackName
};
var response = await cloudformation.DescribeStacksAsync(request, cancellationToken);
return(response.Stacks.Any() ? ChangeSetType.UPDATE : ChangeSetType.UPDATE);
}
catch
{
return(ChangeSetType.CREATE);
}
}
private async Task WaitForChangeSetExecute(string stackId, DeployContext context, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
Console.WriteLine("Executing changeset...\n");
var stackStatus = ResourceStatus.CREATE_IN_PROGRESS;
var lastEventId = (string?)null;
while (stackStatus != ResourceStatus.CREATE_COMPLETE && stackStatus != ResourceStatus.UPDATE_COMPLETE)
{
cancellationToken.ThrowIfCancellationRequested();
await Task.Delay(1000, cancellationToken);
var events = await GetStackEvents(lastEventId, stackId, context, cancellationToken);
foreach (var @event in events)
{
var header = $"[{@event.LogicalResourceId}]: {@event.ResourceStatus}\n";
header += string.Join('\0', Enumerable.Repeat('-', header.Length));
Console.ForegroundColor = ConsoleColor.Cyan;
Console.WriteLine(header);
Console.ResetColor();
Console.WriteLine(@event.ResourceStatusReason);
Console.WriteLine();
lastEventId = @event.EventId;
if (@event.ResourceType == "AWS::CloudFormation::Stack" && @event.LogicalResourceId == context.StackName)
{
stackStatus = @event.ResourceStatus;
}
}
if (stackStatus.ToString().EndsWith("_FAILED") || stackStatus.ToString().EndsWith("ROLLBACK_COMPLETE"))
{
throw new Exception("Deployment failed.");
}
}
}
private async Task <List <StackEvent> > GetStackEvents(string?lastEventId, string stackId, DeployContext context, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
var request = new DescribeStackEventsRequest {
StackName = stackId
};
var response = await cloudformation.DescribeStackEventsAsync(request, cancellationToken);
var relevantEvents = new List <StackEvent>();
foreach (var @event in response.StackEvents)
{
if (@event.EventId == lastEventId || @event.Timestamp < context.Timestamp)
{
break;
}
relevantEvents.Add(@event);
}
relevantEvents.Reverse();
return(relevantEvents);
}