Github user cestella commented on a diff in the pull request:
https://github.com/apache/incubator-metron/pull/421#discussion_r97821590
--- Diff:
metron-platform/metron-enrichment/src/main/java/org/apache/metron/enrichment/stellar/GeoEnrichmentFunctions.java
---
@@ -0,0 +1,110 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.metron.enrichment.stellar;
+
+import org.apache.log4j.Logger;
+import org.apache.metron.common.dsl.Context;
+import org.apache.metron.common.dsl.ParseException;
+import org.apache.metron.common.dsl.Stellar;
+import org.apache.metron.common.dsl.StellarFunction;
+import org.apache.metron.enrichment.adapters.geo.GeoLiteDatabase;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+public class GeoEnrichmentFunctions {
+ private static final Logger LOG =
Logger.getLogger(GeoEnrichmentFunctions.class);
+
+ @Stellar(name="GET"
+ ,namespace="GEO"
+ ,description="Look up an IPV4 address and returns geographic
information about it"
+ ,params = {
+ "ip - The IPV4 address to lookup" +
+ "fields - Optional list of GeoIP fields to grab.
Options are locID, country, city, postalCode, dmaCode, latitude, longitude,
location_point"
+ }
+ ,returns = "If a Single field is requested a string of the
field, If multiple fields a map of string of the fields, and null otherwise"
+ )
+ public static class GeoGet implements StellarFunction {
+ boolean initialized = false;
+
+ @Override
+ public Object apply(List<Object> args, Context context) throws
ParseException {
+ if(!initialized) {
+ return null;
+ }
+ if(args.size() > 2) {
+ return null;
--- End diff --
So it is true that we do not tend to throw exceptions on some errors in
Stellar functions for reasons that may or may not be valid. The original
intent was to not stop topologies because an error has happened in a specific
function. I happen to think that this isn't correct reasoning anymore, but
that's a discussion for another thread.
In this specific case, that the user has passed in too many arguments, I
think you could make a reasonable argument for a couple of different semantics:
* do nothing, passing in too many arguments does no harm
* throw an exception as Nick suggests
* return null
I actually think I agree in this case with Nick, I'd rather err on the side
of caution and throw an exception here so we don't have people using functions
wrong and not realizing it.
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