// This method runs concurrently with other index processing.
// Ensure all logic here is idempotent.
public void ProcessFunctionStarted(FunctionStartedMessage message)
{
FunctionInstanceSnapshot snapshot = CreateSnapshot(message);
_functionInstanceLogger.LogFunctionStarted(snapshot);
string functionId = new FunctionIdentifier(message.SharedQueueName, message.Function.Id).ToString();
Guid functionInstanceId = message.FunctionInstanceId;
DateTimeOffset startTime = message.StartTime;
WebJobRunIdentifier webJobRunId = message.WebJobRunIdentifier;
Guid? parentId = message.ParentId;
// Race to write index entries for function started.
if (!HasLoggedFunctionCompleted(functionInstanceId))
{
CreateOrUpdateIndexEntries(snapshot, startTime, webJobRunId);
}
// If the function has since completed, we lost the race.
// Delete any function started index entries.
// Note that this code does not depend on whether or not the index entries were previously written by this
// method, as this processing could have been aborted and resumed at another point in time. In that case,
// we still own cleaning up any dangling function started index entries.
DateTimeOffset?functionCompletedTime = GetFunctionCompletedTime(functionInstanceId);
bool hasLoggedFunctionCompleted = functionCompletedTime.HasValue;
if (hasLoggedFunctionCompleted)
{
DeleteFunctionStartedIndexEntriesIfNeeded(functionInstanceId, message.StartTime,
functionCompletedTime.Value, functionId, parentId, webJobRunId);
}
}