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Example Python script to use from NiFi ExecuteScript processor which reads the first line from an incoming flow file.
from org.apache.nifi.processors.script import ExecuteScript
from org.apache.nifi.processor.io import InputStreamCallback
from java.io import BufferedReader, InputStreamReader
class ReadFirstLine(InputStreamCallback) :
__line = None;
def __init__(self) :
pass
def getLine(self) :
return self.__line
def process(self, input) :
try :
reader = InputStreamReader(input)
bufferedReader = BufferedReader(reader)
self.__line = bufferedReader.readLine()
except :
print "Exception in Reader:"
print '-' * 60
traceback.print_exc(file=sys.stdout)
print '-' * 60
raise
finally :
if bufferedReader is not None :
bufferedReader.close()
if reader is not None :
reader.close()
flowFile = session.get()
if flowFile is not None :
reader = ReadFirstLine()
session.read(flowFile, reader)
flowFile = session.putAttribute(flowFile, "from-content", reader.getLine())
session.transfer(flowFile, ExecuteScript.REL_SUCCESS)
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