private static bool TryResolveParameters(FunctionSnapshot function, FunctionInstanceSnapshot snapshot, out IEnumerable <FunctionParameterViewModel> resolvedParameters)
{
List <FunctionParameterViewModel> parameters = new List <FunctionParameterViewModel>();
foreach (KeyValuePair <string, ParameterSnapshot> parameter in function.Parameters)
{
if (!snapshot.Arguments.ContainsKey(parameter.Key))
{
resolvedParameters = null;
return(false);
}
FunctionParameterViewModel parameterModel = new FunctionParameterViewModel
{
Name = parameter.Key,
Description = parameter.Value.Prompt,
Value = snapshot.Arguments[parameter.Key].Value
};
parameters.Add(parameterModel);
}
resolvedParameters = parameters;
return(true);
}
public ActionResult Replay(string parentId, string queue, FormCollection form)
{
Guid parent;
FunctionSnapshot function = GetFunctionFromInstance(parentId, out parent);
return(Invoke(queue, form, function, ExecutionReason.Dashboard, parent));
}
public bool UpdateOrCreateIfLatest(FunctionSnapshot snapshot, string currentETag, DateTimeOffset currentVersion)
{
if (snapshot == null)
{
throw new ArgumentNullException("snapshot");
}
StoreItem existing = _store.Where(i => i.FunctionSnapshot.Id == snapshot.Id).FirstOrDefault();
if (existing == null)
{
_store.Add(CreateStoreItem(snapshot));
return(true);
}
else if (currentETag == existing.ETag && currentVersion < snapshot.HostVersion)
{
Debug.Assert(currentVersion == existing.FunctionSnapshot.HostVersion);
_store.Remove(existing);
_store.Add(CreateStoreItem(snapshot));
return(true);
}
else
{
// Tell callers when they have the latest version, even if it was already present.
return(existing.FunctionSnapshot.HostVersion == snapshot.HostVersion);
}
}
public Guid TriggerAndOverride(string queueName, FunctionSnapshot function,
IDictionary <string, string> arguments, Guid?parentId, ExecutionReason reason)
{
if (function == null)
{
throw new ArgumentNullException("function");
}
Guid id = Guid.NewGuid();
CallAndOverrideMessage message = new CallAndOverrideMessage
{
Id = id,
FunctionId = function.HostFunctionId,
Arguments = arguments,
ParentId = parentId,
Reason = reason
};
string functionId = new FunctionIdentifier(function.QueueName, function.HostFunctionId).ToString();
FunctionInstanceSnapshot snapshot = CreateSnapshot(id, arguments, parentId, DateTimeOffset.UtcNow,
functionId, function.FullName, function.ShortName);
_logger.LogFunctionQueued(snapshot);
_sender.Enqueue(queueName, message);
return(id);
}
private static StoreItem CreateStoreItem(FunctionSnapshot snapshot)
{
return(new StoreItem
{
FunctionSnapshot = snapshot,
ETag = Guid.NewGuid().ToString()
});
}
private ActionResult Invoke(string queueName, FormCollection form, FunctionSnapshot function, ExecutionReason reason, Guid?parentId)
{
if (function == null)
{
return(HttpNotFound());
}
IDictionary <string, string> arguments = GetArguments(form);
Guid id = _invoker.TriggerAndOverride(queueName, function, arguments, parentId, reason);
return(Redirect("~/#/functions/invocations/" + id));
}
private RunFunctionViewModel CreateRunFunctionViewModel(FunctionSnapshot function, IEnumerable <FunctionParameterViewModel> parameters, string submitText, Guid?parentId)
{
return(new RunFunctionViewModel
{
QueueName = function.QueueName,
FunctionId = function.Id,
Parameters = parameters,
ParentId = parentId,
FunctionName = function.ShortName,
FunctionFullName = function.FullName,
HostIsNotRunning = !FunctionsController.HostHasHeartbeat(_heartbeatMonitor, function).GetValueOrDefault(true),
SubmitText = submitText
});
}
private static IEnumerable <FunctionParameterViewModel> CreateParameters(FunctionSnapshot function)
{
List <FunctionParameterViewModel> parameters = new List <FunctionParameterViewModel>();
foreach (KeyValuePair <string, ParameterSnapshot> parameter in function.Parameters)
{
FunctionParameterViewModel parameterModel = new FunctionParameterViewModel
{
Name = parameter.Key,
Description = parameter.Value.Prompt,
Value = parameter.Value.DefaultValue
};
parameters.Add(parameterModel);
}
return(parameters);
}
public ActionResult Run(string functionId)
{
if (functionId == null)
{
return(HttpNotFound());
}
FunctionSnapshot function = GetFunction(functionId);
if (function == null)
{
return(HttpNotFound());
}
var model = CreateRunFunctionViewModel(function, CreateParameters(function), "Run", null);
return(View(model));
}
public ActionResult Replay(string parentId)
{
if (parentId == null)
{
return(HttpNotFound());
}
Guid parent;
FunctionInstanceSnapshot parentLog;
FunctionSnapshot function = GetFunctionFromInstance(parentId, out parent, out parentLog);
if (function == null)
{
return(HttpNotFound());
}
IEnumerable <FunctionParameterViewModel> parameters;
ViewBag.CanReplay = TryResolveParameters(function, parentLog, out parameters);
var model = CreateRunFunctionViewModel(function, parameters, "Replay", parent);
return(View(model));
}
public ActionResult Run(string queue, string functionId, FormCollection form)
{
FunctionSnapshot function = GetFunction(functionId);
return(Invoke(queue, form, function, ExecutionReason.Dashboard, null));
}
internal static bool?HostHasHeartbeat(IHeartbeatValidityMonitor heartbeatMonitor, FunctionSnapshot snapshot)
{
return(HostHasHeartbeat(heartbeatMonitor, snapshot.HeartbeatExpirationInSeconds,
snapshot.HeartbeatSharedContainerName, snapshot.HeartbeatSharedDirectoryName));
}
public void ProcessHostStarted(HostStartedMessage message)
{
if (message == null)
{
throw new ArgumentNullException("message");
}
string hostId = message.SharedQueueName;
DateTimeOffset hostVersion = message.EnqueuedOn;
DateTime hostVersionUtc = hostVersion.UtcDateTime;
IEnumerable <FunctionDescriptor> messageFunctions = message.Functions ?? Enumerable.Empty <FunctionDescriptor>();
HostSnapshot newSnapshot = new HostSnapshot
{
HostVersion = hostVersion,
FunctionIds = CreateFunctionIds(messageFunctions)
};
if (_hostIndexManager.UpdateOrCreateIfLatest(hostId, newSnapshot))
{
IEnumerable <VersionedMetadata> existingFunctions = _functionIndexManager.List(hostId);
IEnumerable <VersionedMetadata> removedFunctions = existingFunctions
.Where((f) => !newSnapshot.FunctionIds.Any(i => f.Id == i));
foreach (VersionedMetadata removedFunction in removedFunctions)
{
// Remove all functions no longer in our list (unless they exist with a later host version than
// ours).
string fullId = new FunctionIdentifier(hostId, removedFunction.Id).ToString();
_functionIndexManager.DeleteIfLatest(fullId, hostVersion, removedFunction.ETag,
removedFunction.Version);
}
HeartbeatDescriptor heartbeat = message.Heartbeat;
IEnumerable <FunctionDescriptor> addedFunctions = messageFunctions
.Where((d) => !existingFunctions.Any(f => d.Id == f.Id));
foreach (FunctionDescriptor addedFunction in addedFunctions)
{
// Create any functions just appearing in our list (or update existing ones if they're earlier than
// ours).
FunctionSnapshot snapshot = CreateFunctionSnapshot(hostId, heartbeat, addedFunction, hostVersion);
_functionIndexManager.CreateOrUpdateIfLatest(snapshot);
}
// Update any functions appearing in both lists provided they're still earlier than ours (or create them
// if they've since been deleted).
var possiblyUpdatedFunctions = existingFunctions
.Join(messageFunctions, (f) => f.Id, (d) => d.Id, (f, d) => new
{
Descriptor = d,
HostVersion = f.Version,
ETag = f.ETag
});
foreach (var possiblyUpdatedFunction in possiblyUpdatedFunctions)
{
FunctionSnapshot snapshot = CreateFunctionSnapshot(hostId, heartbeat,
possiblyUpdatedFunction.Descriptor, hostVersion);
_functionIndexManager.UpdateOrCreateIfLatest(snapshot, possiblyUpdatedFunction.ETag,
possiblyUpdatedFunction.HostVersion);
}
}
// Delete any functions we may have added or updated that are no longer in the index.
// The create and update calls above may have occured after another instance started processing a later
// version of this host. If that instance had already read the existing function list before we added the
// function, it would think the function had already been deleted. In the end, we can't leave a function
// around unless it's still in the host index after we've added or updated it.
HostSnapshot finalSnapshot = _hostIndexManager.Read(hostId);
IEnumerable <FunctionDescriptor> functionsRemovedAfterThisHostVersion;
if (finalSnapshot == null)
{
functionsRemovedAfterThisHostVersion = messageFunctions;
}
else if (finalSnapshot.HostVersion.UtcDateTime > hostVersionUtc)
{
// Note that we base the list of functions to delete on what's in the HostStartedMessage, not what's in
// the addedFunctions and possibleUpdatedFunctions variables, as this instance could have been aborted
// and resumed and could lose state like those local variables.
functionsRemovedAfterThisHostVersion = messageFunctions.Where(
f => !finalSnapshot.FunctionIds.Any((i) => f.Id == i));
}
else
{
functionsRemovedAfterThisHostVersion = Enumerable.Empty <FunctionDescriptor>();
}
foreach (FunctionDescriptor functionNoLongerInSnapshot in functionsRemovedAfterThisHostVersion)
{
string fullId = new FunctionIdentifier(hostId, functionNoLongerInSnapshot.Id).ToString();
_functionIndexManager.DeleteIfLatest(fullId, hostVersionUtc);
}
_functionIndexVersionManager.UpdateOrCreateIfLatest(newSnapshot.HostVersion);
}
