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https://issues.apache.org/jira/browse/METRON-505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15582388#comment-15582388
]
ASF GitHub Bot commented on METRON-505:
---------------------------------------
Github user cestella commented on a diff in the pull request:
https://github.com/apache/incubator-metron/pull/312#discussion_r83652687
--- Diff:
metron-platform/metron-common/src/main/java/org/apache/metron/common/dsl/functions/SystemFunctions.java
---
@@ -0,0 +1,75 @@
+/**
+ * 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.common.dsl.functions;
+
+import org.apache.metron.common.dsl.BaseStellarFunction;
+import org.apache.metron.common.dsl.Stellar;
+import org.apache.metron.common.system.Environment;
+
+import java.util.List;
+
+public class SystemFunctions {
+
+ @Stellar(namespace = "SYSTEM",
+ name = "ENV_GET",
+ description = "Returns the value associated with an environment
variable",
+ params = {
+ "env_var - Environment variable name to get the value
for"
+ },
+ returns = "String"
+ )
+ public static class EnvGet extends BaseStellarFunction {
+ private Environment env;
+
+ public EnvGet() {
+ this(new Environment());
+ }
+
+ public EnvGet(Environment env) {
+ this.env = env;
+ }
+
+ @Override
+ public Object apply(List<Object> args) {
+ if (args.size() == 0) {
+ return null;
+ } else {
+ return env.get((String) args.get(0));
--- End diff --
That being said, we could probably do better across the board. Maybe some
functions that consistently coerce types (or not, in the case of strings) that
people can use.
> Add environment variable and system property functions to the Stellar language
> ------------------------------------------------------------------------------
>
> Key: METRON-505
> URL: https://issues.apache.org/jira/browse/METRON-505
> Project: Metron
> Issue Type: Improvement
> Reporter: Michael Miklavcic
> Assignee: Michael Miklavcic
>
> Stellar and the Stellar REPL allow you assign variables and compose functions
> for use in parsing, enrichment, and threat triage. There is currently no
> mechanism for extracting values from environment variables and Java system
> properties. This Jira tracks adding functions for exposing this functionality
> in Stellar.
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