public static async T.Task <IEnumerable <Node> > GetNodesAsync(this CloudUtilities u, string lowerNodeName, string higherNodeName, int?count, CancellationToken token)
{
var nodesTable = u.GetNodesTable();
var partitionQuery = u.GetPartitionQueryString(u.NodesPartitionKey);
var lastRegistrationKey = u.GetRegistrationKey(lowerNodeName);
var registrationEnd = u.GetRegistrationKey(higherNodeName);
var registrationRangeQuery = u.GetRowKeyRangeString(lastRegistrationKey, registrationEnd);
var q = TableQuery.CombineFilters(
partitionQuery,
TableOperators.And,
registrationRangeQuery);
var registrations = (await nodesTable.QueryAsync <ComputeClusterRegistrationInformation>(q, count, token)).Select(r => r.Item3).ToList();
if (!registrations.Any())
{
return(new Node[0]);
}
var firstHeartbeat = u.GetHeartbeatKey(registrations[0].NodeName.ToLowerInvariant());
var lastHeartbeat = u.GetHeartbeatKey(registrations[registrations.Count - 1].NodeName.ToLowerInvariant());
var heartbeatRangeQuery = u.GetRowKeyRangeString(firstHeartbeat, lastHeartbeat, true);
q = TableQuery.CombineFilters(
partitionQuery,
TableOperators.And,
heartbeatRangeQuery);
var heartbeats = (await nodesTable.QueryAsync <ComputeClusterNodeInformation>(q, null, token)).ToDictionary(h => h.Item3.Name.ToLowerInvariant(), h => (h.Item3, h.Item4));
return(registrations.Select(r =>
{
var nodeName = r.NodeName.ToLowerInvariant();
var node = new Node()
{
NodeRegistrationInfo = r, Name = nodeName,
};
if (heartbeats.TryGetValue(nodeName, out (ComputeClusterNodeInformation, DateTimeOffset)n))
{
node.LastHeartbeatTime = n.Item2;
node.RunningJobCount = n.Item1.Jobs.Count;
if (n.Item2.AddSeconds(u.Option.MaxMissedHeartbeats * u.Option.HeartbeatIntervalSeconds) > DateTimeOffset.UtcNow)
{
node.Health = NodeHealth.OK;
node.State = NodeState.Online;
// TODO: adding events
}
else
{
node.Health = NodeHealth.Error;
}
}
return node;
}));
}