public async Task <IEnumerable <Dictionary <string, string> > > GetTaskResult(string groupId, string taskId, string sortAttribute, bool ascending, params string[] selection)
{
DynamoDBStructure dynamoDbStructure = TaskConfigurationService.GetDynamoDBStructure(groupId, taskId);
string table = $"{groupId}{taskId}";
IEnumerable <Dictionary <string, string> > result;
List <Dictionary <string, string> > raw = new List <Dictionary <string, string> >();
if (selection == null || selection.Length == 0)
{
var scanResult = await DynamoDB.ScanAsync(table, new List <string>(dynamoDbStructure.Attributes));
scanResult.Items.ForEach(r =>
{
var dict = new Dictionary <string, string>();
foreach (var kvp in r)
{
dict.Add(kvp.Key, kvp.Value.S);
}
raw.Add(dict);
});
}
else
{
QueryRequest request = new QueryRequest();
request.TableName = table;
request.ExpressionAttributeValues = new Dictionary <string, AttributeValue>();
for (int i = 0; i < selection.Length; i += 2)
{
var condition = $"{selection[i]}=:a{i+1}";
if (i == 0)
{
request.KeyConditionExpression = condition;
}
else
{
request.KeyConditionExpression = request.KeyConditionExpression + $" AND {condition}";
}
request.ExpressionAttributeValues.Add($":a{i+1}", new AttributeValue(selection[i + 1]));
}
var response = await DynamoDB.QueryAsync(request);
response.Items.ForEach(r =>
{
var dict = new Dictionary <string, string>();
foreach (var kvp in r)
{
dict.Add(kvp.Key, kvp.Value.S);
}
raw.Add(dict);
});
}
result = raw;
if (!string.IsNullOrEmpty(sortAttribute))
{
result = ascending ?
raw.OrderBy(p => Convert.ToDouble(p[sortAttribute], CultureInfo.InvariantCulture)) :
raw.OrderByDescending(p => Convert.ToDouble(p[sortAttribute], CultureInfo.InvariantCulture));
}
return(result);
}
public async Task <Result> StartDataServer()
{
if (EC2Client == null || TaskConfigurationService == null)
{
return new Result()
{
ErrorCode = Constants.ErrorCodes.FAILURE
}
}
;
InstanceConfiguration instanceConfiguration = TaskConfigurationService.GetDataPreparationConfiguration();
var runInstanceResponse = await Instances.LaunchInstance(EC2Client, instanceConfiguration);
var instanceId = runInstanceResponse.Reservation.Instances[0].InstanceId;
bool isInstanceRunning = false;
DescribeInstanceStatusResponse describeInstanceStatusResponse;
GetInstanceStatusRequestConfiguration instanceStatusReqConfig = new GetInstanceStatusRequestConfiguration()
{
InstanceIds = new List <string>()
{
instanceId
},
IncludeAllInstances = true
};
// timeout?
while (!isInstanceRunning)
{
describeInstanceStatusResponse = await Instances.GetInstanceStatus(EC2Client, instanceStatusReqConfig);
var instance = describeInstanceStatusResponse.InstanceStatuses.Where(i => i.InstanceId == instanceId)
.FirstOrDefault();
if (instance != null)
{
switch (instance.InstanceState.Code)
{
case INSTANCE_STATE_CODE_PENDING:
continue;
case INSTANCE_STATE_CODE_RUNNING:
isInstanceRunning = true;
break;
default:
throw new System.Exception("Instance stopped.");
}
}
else
{
throw new System.Exception("Instance not found.");
}
}
return(new Result {
ErrorCode = Constants.ErrorCodes.OK
});
}
