This simple InvokeScriptedProcessor will look for a FlowFile attribute called "ip_address" and will attempt the reverse lookup and create a new attribute called "host_name" with the resolved value. import groovy.json.JsonOutput
import groovy.json.JsonSlurper
import java.net.InetAddress
import java.net.UnknownHostException
import java.nio.charset.StandardCharsets
import org.apache.commons.io.IOUtils
class GroovyProcessor implements Processor {
PropertyDescriptor BATCH_SIZE = new PropertyDescriptor.Builder()
.name("BATCH_SIZE")
.displayName("Batch Size")
.description("The number of incoming FlowFiles to process in a single execution of this processor.")
.required(true)
.defaultValue("1000")
.addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
.build()
Relationship REL_SUCCESS = new Relationship.Builder()
.name("success")
.description('FlowFiles that were successfully processed are routed here')
.build()
Relationship REL_FAILURE = new Relationship.Builder()
.name("failure")
.description('FlowFiles that were not successfully processed are routed here')
.build()
ComponentLog log
void initialize(ProcessorInitializationContext context) { log = context.logger }
Set<Relationship> getRelationships() { return [REL_FAILURE, REL_SUCCESS] as Set }
Collection<ValidationResult> validate(ValidationContext context) { null }
PropertyDescriptor getPropertyDescriptor(String name) { null }
void onPropertyModified(PropertyDescriptor descriptor, String oldValue, String newValue) { }
List<PropertyDescriptor> getPropertyDescriptors() { Collections.unmodifiableList([BATCH_SIZE]) as List<PropertyDescriptor> }
String getIdentifier() { null }
JsonSlurper jsonSlurper = new JsonSlurper()
JsonOutput jsonOutput = new JsonOutput()
def reverseDnsLookup(String ipAddress) {
try {
InetAddress inetAddress = InetAddress.getByName(ipAddress)
String hostName = inetAddress.getCanonicalHostName()
return hostName
} catch (UnknownHostException e) {
return "Unknown"
}
}
void onTrigger(ProcessContext context, ProcessSessionFactory sessionFactory) throws ProcessException {
ProcessSession session = sessionFactory.createSession()
try {
List<FlowFile> flowFiles = session.get(context.getProperty(BATCH_SIZE).asInteger())
if (!flowFiles) return
Map customAttributes = [:]
flowFiles.each { flowFile ->
String ipAddress = flowFile.getAttribute("ip_address")
if (ipAddress) {
String hostName = reverseDnsLookup(ipAddress)
customAttributes["host_name"] = hostName
flowFile = session.putAllAttributes(flowFile, customAttributes)
}
session.transfer(flowFile, REL_SUCCESS)
}
session.commit()
} catch (final Throwable t) {
log.error('{} failed to process due to {}; rolling back session', [this, t] as Object[])
session.rollback(true)
throw t
}
}
}
processor = new GroovyProcessor()
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