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/**
* 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.hadoop.fs.shell;
import java.io.IOException;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.FsStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.util.StringUtils;
/** Base class for commands related to viewing filesystem usage, such as
* du and df
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
class FsUsage extends FsCommand {
public static void registerCommands(CommandFactory factory) {
factory.addClass(Df.class, "-df");
factory.addClass(Du.class, "-du");
factory.addClass(Dus.class, "-dus");
}
protected boolean humanReadable = false;
protected TableBuilder usagesTable;
protected String formatSize(long size) {
return humanReadable
? StringUtils.TraditionalBinaryPrefix.long2String(size, "", 1)
: String.valueOf(size);
}
/** Show the size of a partition in the filesystem */
public static class Df extends FsUsage {
public static final String NAME = "df";
public static final String USAGE = "[-h] [ ...]";
public static final String DESCRIPTION =
"Shows the capacity, free and used space of the filesystem. "+
"If the filesystem has multiple partitions, and no path to a " +
"particular partition is specified, then the status of the root " +
"partitions will be shown.\n" +
"-h: Formats the sizes of files in a human-readable fashion " +
"rather than a number of bytes.";
@Override
protected void processOptions(LinkedList args)
throws IOException {
CommandFormat cf = new CommandFormat(0, Integer.MAX_VALUE, "h");
cf.parse(args);
humanReadable = cf.getOpt("h");
if (args.isEmpty()) args.add(Path.SEPARATOR);
}
@Override
protected void processArguments(LinkedList args)
throws IOException {
usagesTable = new TableBuilder(
"Filesystem", "Size", "Used", "Available", "Use%");
usagesTable.setRightAlign(1, 2, 3, 4);
super.processArguments(args);
if (!usagesTable.isEmpty()) {
usagesTable.printToStream(out);
}
}
@Override
protected void processPath(PathData item) throws IOException {
FsStatus fsStats = item.fs.getStatus(item.path);
long size = fsStats.getCapacity();
long used = fsStats.getUsed();
long free = fsStats.getRemaining();
usagesTable.addRow(
item.fs.getUri(),
formatSize(size),
formatSize(used),
formatSize(free),
StringUtils.formatPercent((double)used/(double)size, 0)
);
}
}
/** show disk usage */
public static class Du extends FsUsage {
public static final String NAME = "du";
public static final String USAGE = "[-s] [-h] ...";
public static final String DESCRIPTION =
"Show the amount of space, in bytes, used by the files that " +
"match the specified file pattern. The following flags are optional:\n" +
"-s: Rather than showing the size of each individual file that" +
" matches the pattern, shows the total (summary) size.\n" +
"-h: Formats the sizes of files in a human-readable fashion" +
" rather than a number of bytes.\n\n" +
"Note that, even without the -s option, this only shows size summaries " +
"one level deep into a directory.\n\n" +
"The output is in the form \n" +
"\tsize\tname(full path)\n";
protected boolean summary = false;
@Override
protected void processOptions(LinkedList args) throws IOException {
CommandFormat cf = new CommandFormat(0, Integer.MAX_VALUE, "h", "s");
cf.parse(args);
humanReadable = cf.getOpt("h");
summary = cf.getOpt("s");
if (args.isEmpty()) args.add(Path.CUR_DIR);
}
@Override
protected void processPathArgument(PathData item) throws IOException {
usagesTable = new TableBuilder(2);
// go one level deep on dirs from cmdline unless in summary mode
if (!summary && item.stat.isDirectory()) {
recursePath(item);
} else {
super.processPathArgument(item);
}
usagesTable.printToStream(out);
}
@Override
protected void processPath(PathData item) throws IOException {
long length;
if (item.stat.isDirectory()) {
length = item.fs.getContentSummary(item.path).getLength();
} else {
length = item.stat.getLen();
}
usagesTable.addRow(formatSize(length), item);
}
}
/** show disk usage summary */
public static class Dus extends Du {
public static final String NAME = "dus";
@Override
protected void processOptions(LinkedList args) throws IOException {
args.addFirst("-s");
super.processOptions(args);
}
@Override
public String getReplacementCommand() {
return "du -s";
}
}
/**
* Creates a table of aligned values based on the maximum width of each
* column as a string
*/
private static class TableBuilder {
protected boolean hasHeader = false;
protected List rows;
protected int[] widths;
protected boolean[] rightAlign;
/**
* Create a table w/o headers
* @param columns number of columns
*/
public TableBuilder(int columns) {
rows = new ArrayList();
widths = new int[columns];
rightAlign = new boolean[columns];
}
/**
* Create a table with headers
* @param headers list of headers
*/
public TableBuilder(Object ... headers) {
this(headers.length);
this.addRow(headers);
hasHeader = true;
}
/**
* Change the default left-align of columns
* @param indexes of columns to right align
*/
public void setRightAlign(int ... indexes) {
for (int i : indexes) rightAlign[i] = true;
}
/**
* Add a row of objects to the table
* @param objects the values
*/
public void addRow(Object ... objects) {
String[] row = new String[widths.length];
for (int col=0; col < widths.length; col++) {
row[col] = String.valueOf(objects[col]);
widths[col] = Math.max(widths[col], row[col].length());
}
rows.add(row);
}
/**
* Render the table to a stream
* @param out PrintStream for output
*/
public void printToStream(PrintStream out) {
if (isEmpty()) return;
StringBuilder fmt = new StringBuilder();
for (int i=0; i < widths.length; i++) {
if (fmt.length() != 0) fmt.append(" ");
if (rightAlign[i]) {
fmt.append("%"+widths[i]+"s");
} else if (i != widths.length-1) {
fmt.append("%-"+widths[i]+"s");
} else {
// prevent trailing spaces if the final column is left-aligned
fmt.append("%s");
}
}
for (Object[] row : rows) {
out.println(String.format(fmt.toString(), row));
}
}
/**
* Number of rows excluding header
* @return rows
*/
public int size() {
return rows.size() - (hasHeader ? 1 : 0);
}
/**
* Does table have any rows
* @return boolean
*/
public boolean isEmpty() {
return size() == 0;
}
}
}
