R/Echo.R

In hpcc-systems/r2hpcc: Call HPCC Ws_SQL functions from R

#' This function takes an input string and "echoes" the value in its result.
#' This function is intended for end-to-end connectivity testing.
#' A successful response indicates a good connection to the server hosting the Ws-SQL Web service.
#'
#' @param conn - HPCC connection information
#' @param echo - String to echo in result
#'
#' @return - Echo string passed in
#' @export
r2hpcc.Echo <- function(conn, echo)
{
	host <- conn[1]
	targetCluster <- conn[2]
	userId <- conn[3]
	password <- conn[4]

	debugMode <- conn[6]
	port <- conn[7]

	body <- ""
	body <- paste('<?xml version="1.0" encoding="utf-8"?>
					<soap:Envelope xmlns="urn:hpccsystems:ws:wssql" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
					<soap:Body>
					<EchoRequest>
					<Request>', echo, '</Request>
					</EchoRequest>
					</soap:Body>
					</soap:Envelope>', sep="")

	txt <- r2hpcc.HTTPRequest(host, userId, password, "Echo", body,port)

	if (debugMode == TRUE)
	{
		print("DEBUG Message <SOAP Response>:")
		print(txt)
	}

	# Check for exception
	resp <- r2hpcc.Exception(conn, txt)

	# Query Proccessed successfully
	if (nchar(resp) == 0)
	{
		newlst <- xmlParse(txt)
		layout <- getNodeSet(newlst, "//*[local-name()='EchoResponse']",
								namespaces = xmlNamespaceDefinitions(newlst, simplify = TRUE))

		if (debugMode == TRUE)
		{
			print("DEBUG Message <EchoResponse node>:")
			print(layout)
		}

		colLayout <<- layout[[1]]
		l1 <<- xmlToList(colLayout)

		if (debugMode == TRUE)
		{
			print("DEBUG Message <EchoResponse node converted to list>:")
			print(l1)
		}

		l2 <- data.frame(Response = r2hpcc.NVL(l1$Response))
		l2
	}
	else
		resp
}