Github user cestella commented on a diff in the pull request:
https://github.com/apache/incubator-metron/pull/277#discussion_r80936127
--- Diff:
metron-platform/metron-management/src/main/java/org/apache/metron/management/FileSystemFunctions.java
---
@@ -0,0 +1,402 @@
+/**
+ * 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.management;
+
+import com.google.common.base.Splitter;
+import com.google.common.collect.Iterables;
+import com.jakewharton.fliptables.FlipTable;
+import org.apache.commons.io.IOUtils;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.*;
+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.common.utils.ConversionUtils;
+
+import java.io.IOException;
+import java.net.URI;
+import java.text.DateFormat;
+import java.util.*;
+import java.util.function.Function;
+
+public class FileSystemFunctions {
+ private static final Logger LOG =
Logger.getLogger(FileSystemFunctions.class);
+
+ public interface FileSystemGetter {
+ FileSystem getSystem() throws IOException ;
+ }
+
+ public static enum FS_TYPE implements FileSystemGetter {
+ LOCAL(() -> {
+ FileSystem fs = new LocalFileSystem();
+ fs.initialize(URI.create("file:///"), new Configuration());
+ return fs;
+ })
+ ,HDFS(() -> FileSystem.get(new Configuration()))
+ ;
+ FileSystemGetter _func;
+ FS_TYPE(FileSystemGetter func) {
+ _func = func;
+ }
+
+
+ @Override
+ public FileSystem getSystem() throws IOException {
+ return _func.getSystem();
+ }
+ }
+
+ private abstract static class FileSystemFunction implements
StellarFunction {
+ protected FileSystem fs;
+ private FileSystemGetter getter;
+ FileSystemFunction(FileSystemGetter getter) {
+ this.getter = getter;
+ }
+ @Override
+ public void initialize(Context context) {
+ try {
+ fs = getter.getSystem();
+ } catch (IOException e) {
+ String message = "Unable to get FileSystem: " + e.getMessage();
+ LOG.error(message, e);
+ throw new IllegalStateException(message, e);
+ }
+ }
+
+ @Override
+ public boolean isInitialized() {
+ return fs != null;
+ }
+
+ }
+
+ static class FileSystemGetList extends FileSystemFunction {
+
+ FileSystemGetList(FileSystemGetter getter) {
+ super(getter);
+ }
+
+ @Override
+ public Object apply(List<Object> args, Context context) throws
ParseException {
+ String path = (String) args.get(0);
+ if(path == null) {
+ return null;
+ }
+ try(FSDataInputStream is = fs.open(new Path(path))) {
+ return IOUtils.readLines(is);
+ } catch (IOException e) {
+ String message = "Unable to read " + path + ": " + e.getMessage();
+ LOG.error(message, e);
+ return null;
+ }
+ }
+ }
+
+ static class FileSystemGet extends FileSystemFunction {
+
+ FileSystemGet(FileSystemGetter getter) {
+ super(getter);
+ }
+
+ @Override
+ public Object apply(List<Object> args, Context context) throws
ParseException {
+ String path = (String) args.get(0);
+ if(path == null) {
+ return null;
+ }
+ try(FSDataInputStream is = fs.open(new Path(path))) {
+ return IOUtils.toString(is);
+ } catch (IOException e) {
+ String message = "Unable to read " + path + ": " + e.getMessage();
+ LOG.error(message, e);
+ return null;
+ }
+ }
+ }
+
+ static class FileSystemRm extends FileSystemFunction {
+
+ FileSystemRm(FileSystemGetter getter) {
+ super(getter);
+ }
+
+ @Override
+ public Object apply(List<Object> args, Context context) throws
ParseException {
+
+ String path = (String) args.get(0);
+ if(path == null) {
+ return false;
+ }
+
+ boolean recursive = false;
+ if(args.size() > 1) {
+ recursive = ConversionUtils.convert(args.get(1), Boolean.class);
+ }
+
+ try {
+ fs.delete(new Path(path), recursive);
+ return true;
+ } catch (IOException e) {
+ String message = "Unable to remove " + path + (recursive?"
recursively":"") + ": " + e.getMessage();
+ LOG.error(message, e);
+ return false;
+ }
+ }
+ }
+
+ static class FileSystemPut extends FileSystemFunction {
+
+ FileSystemPut(FileSystemGetter getter) {
+ super(getter);
+ }
+
+ @Override
+ public Object apply(List<Object> args, Context context) throws
ParseException {
+ String content = (String)args.get(0);
+ if(content == null) {
+ return false;
+ }
+ String path = (String) args.get(1);
+ if(path == null) {
+ return false;
+ }
+
+ try(FSDataOutputStream os = fs.create(new Path(path))) {
+ os.writeBytes(content);
+ os.flush();
+ return true;
+ } catch (IOException e) {
+ String message = "Unable to write " + path + ": " + e.getMessage();
+ LOG.error(message, e);
+ return false;
+ }
+ }
+ }
+
+ static class FileSystemLs extends FileSystemFunction {
+ private static ThreadLocal<DateFormat> dateFormat = new
ThreadLocal<DateFormat>() {
+
+ @Override
+ protected DateFormat initialValue() {
+ return DateFormat.getDateTimeInstance(
+ DateFormat.DEFAULT,
+ DateFormat.DEFAULT,
+ Locale.getDefault()
+ );
+ }
+ };
+
+ FileSystemLs(FileSystemGetter getter) {
+ super(getter);
+ }
+
+ @Override
+ public Object apply(List<Object> args, Context context) throws
ParseException {
+
+ String path = (String) args.get(0);
--- End diff --
agreed, homedir makes sense
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