public static async Task DeleteContainerIfExists(string containerName)
{
var tcs = new TaskCompletionSource <bool>();
using (await ContainerProvider.Lock.WaitAsync().ConfigureAwait(continueOnCapturedContext: false))
{
if (ContainerProvider.ExecutionStates[containerName] == ContainerExecutionState.Ready)
{
ContainerProvider.ExecutionStates[containerName] = ContainerExecutionState.Deleted;
tcs.SetResult(result: true);
}
else if (ContainerProvider.ExecutionStates[containerName] == ContainerExecutionState.Deleted)
{
return;
}
else
{
ContainerProvider.DeletionTasks[containerName] = tcs;
}
}
await tcs.Task.ConfigureAwait(continueOnCapturedContext : false);
await ContainerProvider
.DeleteContainer(containerName : containerName)
.ConfigureAwait(continueOnCapturedContext: false);
}
private static async Task ExpireContainer(string containerName)
{
while (true)
{
var timeSinceLastExecution = DateTime.UtcNow - ContainerProvider.Containers[containerName].LastExecutionTime;
var expirationTimeSpan = TimeSpan.FromMinutes(ServerlessConfiguration.ContainerLifeInMinutes);
if (timeSinceLastExecution >= expirationTimeSpan)
{
var delete = false;
using (await ContainerProvider.Lock.WaitAsync().ConfigureAwait(continueOnCapturedContext: false))
{
if (ContainerProvider.ExecutionStates[containerName] == ContainerExecutionState.Ready)
{
ContainerProvider.ExecutionStates[containerName] = ContainerExecutionState.Deleted;
delete = true;
}
else if (ContainerProvider.ExecutionStates[containerName] == ContainerExecutionState.Deleted)
{
return;
}
}
if (delete)
{
await ContainerProvider
.DeleteContainer(containerName : containerName)
.ConfigureAwait(continueOnCapturedContext: false);
return;
}
}
await Task
.Delay(delay : expirationTimeSpan - timeSinceLastExecution)
.ConfigureAwait(continueOnCapturedContext: false);
}
}