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| Author | SHA1 | Date | |
|---|---|---|---|
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cc155b0f78 | ||
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7ef4eb8da8 |
3
safe-file-roll-sink/.gitignore
vendored
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3
safe-file-roll-sink/.gitignore
vendored
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|
||||
*.iml
|
||||
.idea
|
||||
target
|
||||
201
safe-file-roll-sink/LICENSE
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201
safe-file-roll-sink/LICENSE
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@@ -0,0 +1,201 @@
|
||||
Apache License
|
||||
Version 2.0, January 2004
|
||||
http://www.apache.org/licenses/
|
||||
|
||||
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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|
||||
1. Definitions.
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58
safe-file-roll-sink/README.MD
Normal file
58
safe-file-roll-sink/README.MD
Normal file
@@ -0,0 +1,58 @@
|
||||
flume-safe-roll-file-sink
|
||||
=========================
|
||||
支持以下特性：
|
||||
-------------------------------
|
||||
+ 支持针对已处理完成文件添加后缀
|
||||
+ 支持已处理完成文件移动
|
||||
+ 支持空文件删除（当进行文件移动或文件重命名时，如文件为空，则执行delete()操作）
|
||||
+ 支持文件多路复制
|
||||
|
||||
|
||||
配置参数：
|
||||
----------------------
|
||||
- sink.moveFile default:false 含义：是否移动文件
|
||||
- sink.targetDirectory default:'' 含义：移动目标目录
|
||||
- sink.useFileSuffix default:false 含义：是否添加文件后缀（移动和复制过程均会使用后缀名）
|
||||
- sink.rollInterval default:30 含义：生成文件间隔 单位秒
|
||||
- sink.fileSuffix default:'' 含义：文件后缀名
|
||||
- sink.filePrefix default:'' 含义：文件前缀名
|
||||
- sink.useCopy default:false 含义：是否复制文件
|
||||
- sink.copyDirectory default:'' 含义：复制目标目录（多个目录请使用英文逗号分隔）
|
||||
|
||||
配置示例：
|
||||
--------------------
|
||||
```shell
|
||||
# 负载机flume client配置
|
||||
|
||||
# 组件名称配置
|
||||
client.sources = source_client
|
||||
client.sinks = sink_client
|
||||
client.channels = channel_client
|
||||
|
||||
# 日志源组件配置（监听目录下新增文件）
|
||||
client.sources.source_client.type = spooldir
|
||||
client.sources.source_client.channels = channel_client
|
||||
client.sources.source_client.spoolDir = /some_logs_dir/
|
||||
client.sources.source_client.fileHeader = true
|
||||
|
||||
# sink组件配置
|
||||
client.sinks.sink_client.type = SafeRollingFileSink
|
||||
client.sinks.sink_client.channel = channel_client
|
||||
client.sinks.sink_client.sink.directory = /data/source
|
||||
client.sinks.sink_client.sink.rollInterval = 1
|
||||
|
||||
client.sinks.sink_client.sink.moveFile = true
|
||||
client.sinks.sink_client.sink.targetDirectory = /data/target
|
||||
|
||||
client.sinks.sink_client.sink.useFileSuffix = true
|
||||
client.sinks.sink_client.sink.fileSuffix = .COMPLETED
|
||||
client.sinks.sink_client.sink.filePrefix = CONNECTION
|
||||
|
||||
client.sinks.sink_client.sink.useCopy = true
|
||||
client.sinks.sink_client.sink.copyDirectory = /data/copy1,/data/copy2
|
||||
|
||||
# 文件管道设置
|
||||
client.channels.channel_client.type = file
|
||||
client.channels.channel_client.checkpointDir = /data/tmp/checkpoint
|
||||
client.channels.channel_client.dataDirs = /data/tmp
|
||||
```
|
||||
33
safe-file-roll-sink/pom.xml
Normal file
33
safe-file-roll-sink/pom.xml
Normal file
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|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||
xmlns="http://maven.apache.org/POM/4.0.0"
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
<groupId>cn.flume</groupId>
|
||||
<artifactId>safe-roll-file-sink</artifactId>
|
||||
<version>1.0</version>
|
||||
|
||||
<dependencies>
|
||||
<dependency>
|
||||
<groupId>org.apache.flume</groupId>
|
||||
<artifactId>flume-ng-core</artifactId>
|
||||
<version>1.6.0</version>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
|
||||
<build>
|
||||
<plugins>
|
||||
<plugin>
|
||||
<groupId>org.apache.maven.plugins</groupId>
|
||||
<artifactId>maven-compiler-plugin</artifactId>
|
||||
<configuration>
|
||||
<source>1.7</source>
|
||||
<target>1.7</target>
|
||||
</configuration>
|
||||
</plugin>
|
||||
</plugins>
|
||||
</build>
|
||||
|
||||
|
||||
</project>
|
||||
@@ -0,0 +1,68 @@
|
||||
package cn.flume.sinks;
|
||||
|
||||
import java.io.File;
|
||||
import java.util.concurrent.atomic.AtomicInteger;
|
||||
|
||||
|
||||
/**
|
||||
* Created by Jenner on 2015/4/9.
|
||||
*
|
||||
* 修正org.apache.flume.formatter.output.PathManager在移动文件时可能出现文件名重复的问题
|
||||
*/
|
||||
public class SafePathManager {
|
||||
private long seriesTimestamp;
|
||||
private File baseDirectory;
|
||||
private AtomicInteger fileIndex;
|
||||
private String filePrefix = "";
|
||||
private static final String IN_USE_SUFFIX = ".tmp";
|
||||
|
||||
private File currentFile;
|
||||
|
||||
public SafePathManager() {
|
||||
}
|
||||
|
||||
public File nextFile() {
|
||||
//重新生成微秒级文件名
|
||||
seriesTimestamp = System.currentTimeMillis();
|
||||
fileIndex = new AtomicInteger();
|
||||
currentFile = new File(baseDirectory, filePrefix + fileIndex.incrementAndGet() + "-" + seriesTimestamp + IN_USE_SUFFIX );
|
||||
|
||||
return currentFile;
|
||||
}
|
||||
|
||||
public File getCurrentFile() {
|
||||
if (currentFile == null) {
|
||||
return nextFile();
|
||||
}
|
||||
|
||||
return currentFile;
|
||||
}
|
||||
|
||||
public void rotate() {
|
||||
currentFile = null;
|
||||
}
|
||||
|
||||
public File getBaseDirectory() {
|
||||
return baseDirectory;
|
||||
}
|
||||
|
||||
public void setBaseDirectory(File baseDirectory) {
|
||||
this.baseDirectory = baseDirectory;
|
||||
}
|
||||
|
||||
public long getSeriesTimestamp() {
|
||||
return seriesTimestamp;
|
||||
}
|
||||
|
||||
public AtomicInteger getFileIndex() {
|
||||
return fileIndex;
|
||||
}
|
||||
|
||||
public String getFilePrefix() {
|
||||
return filePrefix;
|
||||
}
|
||||
|
||||
public void setFilePrefix(String filePrefix) {
|
||||
this.filePrefix = filePrefix;
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,436 @@
|
||||
package cn.flume.sinks;
|
||||
|
||||
import com.google.common.base.Preconditions;
|
||||
import com.google.common.util.concurrent.ThreadFactoryBuilder;
|
||||
import org.apache.flume.*;
|
||||
import org.apache.flume.conf.Configurable;
|
||||
import org.apache.flume.instrumentation.SinkCounter;
|
||||
import org.apache.flume.serialization.EventSerializer;
|
||||
import org.apache.flume.serialization.EventSerializerFactory;
|
||||
import org.apache.flume.sink.AbstractSink;
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
import java.io.*;
|
||||
import java.util.concurrent.Executors;
|
||||
import java.util.concurrent.ScheduledExecutorService;
|
||||
import java.util.concurrent.TimeUnit;
|
||||
|
||||
public class SafeRollingFileSink extends AbstractSink implements Configurable {
|
||||
|
||||
private static final Logger logger = LoggerFactory.getLogger(SafeRollingFileSink.class);
|
||||
private static final long defaultRollInterval = 30;
|
||||
private static final int defaultBatchSize = 100;
|
||||
|
||||
private int batchSize = defaultBatchSize;
|
||||
|
||||
private File directory;
|
||||
private long rollInterval;
|
||||
//已完成写入的文件，是否使用后缀
|
||||
private boolean useFileSuffix;
|
||||
//后缀名
|
||||
private String fileSuffix;
|
||||
//前缀名
|
||||
private String filePrefix;
|
||||
//是否移动文件
|
||||
private boolean moveFile;
|
||||
//移动文件目录
|
||||
private File targetDirectory;
|
||||
//是否复制文件
|
||||
private boolean useCopy;
|
||||
//目标目录
|
||||
private File[] copyDirectory;
|
||||
|
||||
private OutputStream outputStream;
|
||||
private ScheduledExecutorService rollService;
|
||||
|
||||
private String serializerType;
|
||||
private Context serializerContext;
|
||||
private EventSerializer serializer;
|
||||
|
||||
private SinkCounter sinkCounter;
|
||||
|
||||
private SafePathManager pathController;
|
||||
private volatile boolean shouldRotate;
|
||||
|
||||
public SafeRollingFileSink() {
|
||||
//原pathController轮转文件名可能会出现重复情况，修正
|
||||
pathController = new SafePathManager();
|
||||
shouldRotate = false;
|
||||
}
|
||||
|
||||
public void configure(Context context) {
|
||||
|
||||
String directory = context.getString("sink.directory");
|
||||
String rollInterval = context.getString("sink.rollInterval");
|
||||
useFileSuffix = context.getBoolean("sink.useFileSuffix", false);
|
||||
fileSuffix = context.getString("sink.fileSuffix", "");
|
||||
filePrefix = context.getString("sink.filePrefix", "");
|
||||
moveFile = context.getBoolean("sink.moveFile", false);
|
||||
String targetDirectory = context.getString("sink.targetDirectory", directory);
|
||||
useCopy = context.getBoolean("sink.useCopy", false);
|
||||
String copyDirectory = context.getString("sink.copyDirectory", "");
|
||||
|
||||
serializerType = context.getString("sink.serializer", "TEXT");
|
||||
serializerContext =
|
||||
new Context(context.getSubProperties("sink." +
|
||||
EventSerializer.CTX_PREFIX));
|
||||
|
||||
Preconditions.checkArgument(directory != null, "Directory may not be null");
|
||||
Preconditions.checkNotNull(serializerType, "Serializer type is undefined");
|
||||
|
||||
if (rollInterval == null) {
|
||||
this.rollInterval = defaultRollInterval;
|
||||
} else {
|
||||
this.rollInterval = Long.parseLong(rollInterval);
|
||||
}
|
||||
|
||||
batchSize = context.getInteger("sink.batchSize", defaultBatchSize);
|
||||
|
||||
this.directory = new File(directory);
|
||||
this.targetDirectory = new File(targetDirectory);
|
||||
|
||||
//检查目录权限
|
||||
if (!this.directory.exists()) {
|
||||
if (!this.directory.mkdirs()) {
|
||||
throw new IllegalArgumentException("sink.directory is not a directory");
|
||||
}
|
||||
} else if (!this.directory.canWrite()) {
|
||||
throw new IllegalArgumentException("sink.directory can not write");
|
||||
}
|
||||
|
||||
//检查目标目录权限
|
||||
if (!this.targetDirectory.exists()) {
|
||||
if (!this.targetDirectory.mkdirs()) {
|
||||
throw new IllegalArgumentException("sink.directory is not a directory");
|
||||
}
|
||||
} else if (!this.targetDirectory.canWrite()) {
|
||||
throw new IllegalArgumentException("sink.directory can not write");
|
||||
}
|
||||
|
||||
//配置文件复制
|
||||
if (copyDirectory.length() > 0 && useCopy) {
|
||||
String[] copyDirectories = copyDirectory.split(",");
|
||||
this.copyDirectory = new File[copyDirectories.length];
|
||||
for (int i = 0; i < copyDirectories.length; i++) {
|
||||
this.copyDirectory[i] = new File(copyDirectories[i]);
|
||||
//检查目标目录权限
|
||||
if (!this.copyDirectory[i].exists()) {
|
||||
if (!this.copyDirectory[i].mkdirs()) {
|
||||
throw new IllegalArgumentException("sink.directory is not a directory");
|
||||
}
|
||||
} else if (!this.copyDirectory[i].canWrite()) {
|
||||
throw new IllegalArgumentException("sink.directory can not write");
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (sinkCounter == null) {
|
||||
sinkCounter = new SinkCounter(getName());
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void start() {
|
||||
logger.info("Starting {}...", this);
|
||||
sinkCounter.start();
|
||||
super.start();
|
||||
|
||||
pathController.setBaseDirectory(directory);
|
||||
pathController.setFilePrefix(filePrefix);
|
||||
if (rollInterval > 0) {
|
||||
|
||||
rollService = Executors.newScheduledThreadPool(
|
||||
1,
|
||||
new ThreadFactoryBuilder().setNameFormat(
|
||||
"rollingFileSink-roller-" +
|
||||
Thread.currentThread().getId() + "-%d").build());
|
||||
|
||||
/*
|
||||
* Every N seconds, mark that it's time to rotate. We purposefully do NOT
|
||||
* touch anything other than the indicator flag to avoid error handling
|
||||
* issues (e.g. IO exceptions occuring in two different threads.
|
||||
* Resist the urge to actually perform rotation in a separate thread!
|
||||
*/
|
||||
rollService.scheduleAtFixedRate(new Runnable() {
|
||||
|
||||
public void run() {
|
||||
logger.debug("Marking time to rotate file {}",
|
||||
pathController.getCurrentFile());
|
||||
shouldRotate = true;
|
||||
}
|
||||
|
||||
}, rollInterval, rollInterval, TimeUnit.SECONDS);
|
||||
} else {
|
||||
logger.info("RollInterval is not valid, file rolling will not happen.");
|
||||
}
|
||||
logger.info("RollingFileSink {} started.", getName());
|
||||
}
|
||||
|
||||
public Status process() throws EventDeliveryException {
|
||||
if (shouldRotate) {
|
||||
logger.debug("Time to rotate {}", pathController.getCurrentFile());
|
||||
|
||||
if (outputStream != null) {
|
||||
logger.debug("Closing file {}", pathController.getCurrentFile());
|
||||
|
||||
try {
|
||||
serializer.flush();
|
||||
serializer.beforeClose();
|
||||
outputStream.close();
|
||||
sinkCounter.incrementConnectionClosedCount();
|
||||
shouldRotate = false;
|
||||
if (useCopy) {
|
||||
if (!copyLogFile(pathController.getCurrentFile())) {
|
||||
logger.error("Copy completed file failed");
|
||||
throw new IOException("Copy completed file failed");
|
||||
}
|
||||
}
|
||||
//文件名加后缀、移动文件
|
||||
if (!rename(pathController.getCurrentFile())) {
|
||||
logger.error("Rename completed file failed");
|
||||
throw new IOException("Rname completed file failed");
|
||||
}
|
||||
} catch (IOException e) {
|
||||
sinkCounter.incrementConnectionFailedCount();
|
||||
throw new EventDeliveryException("Unable to rotate file "
|
||||
+ pathController.getCurrentFile() + " while delivering event", e);
|
||||
} finally {
|
||||
serializer = null;
|
||||
outputStream = null;
|
||||
}
|
||||
|
||||
pathController.rotate();
|
||||
}
|
||||
}
|
||||
|
||||
if (outputStream == null) {
|
||||
File currentFile = pathController.getCurrentFile();
|
||||
logger.debug("Opening output stream for file {}", currentFile);
|
||||
try {
|
||||
outputStream = new BufferedOutputStream(
|
||||
new FileOutputStream(currentFile));
|
||||
serializer = EventSerializerFactory.getInstance(
|
||||
serializerType, serializerContext, outputStream);
|
||||
serializer.afterCreate();
|
||||
sinkCounter.incrementConnectionCreatedCount();
|
||||
} catch (IOException e) {
|
||||
sinkCounter.incrementConnectionFailedCount();
|
||||
throw new EventDeliveryException("Failed to open file "
|
||||
+ pathController.getCurrentFile() + " while delivering event", e);
|
||||
}
|
||||
}
|
||||
|
||||
Channel channel = getChannel();
|
||||
Transaction transaction = channel.getTransaction();
|
||||
Event event = null;
|
||||
Status result = Status.READY;
|
||||
|
||||
try {
|
||||
transaction.begin();
|
||||
int eventAttemptCounter = 0;
|
||||
for (int i = 0; i < batchSize; i++) {
|
||||
event = channel.take();
|
||||
if (event != null) {
|
||||
sinkCounter.incrementEventDrainAttemptCount();
|
||||
eventAttemptCounter++;
|
||||
serializer.write(event);
|
||||
|
||||
/*
|
||||
* FIXME: Feature: Rotate on size and time by checking bytes written and
|
||||
* setting shouldRotate = true if we're past a threshold.
|
||||
*/
|
||||
|
||||
/*
|
||||
* FIXME: Feature: Control flush interval based on time or number of
|
||||
* events. For now, we're super-conservative and flush on each write.
|
||||
*/
|
||||
} else {
|
||||
// No events found, request back-off semantics from runner
|
||||
result = Status.BACKOFF;
|
||||
break;
|
||||
}
|
||||
}
|
||||
serializer.flush();
|
||||
outputStream.flush();
|
||||
transaction.commit();
|
||||
sinkCounter.addToEventDrainSuccessCount(eventAttemptCounter);
|
||||
} catch (Exception ex) {
|
||||
transaction.rollback();
|
||||
throw new EventDeliveryException("Failed to process transaction", ex);
|
||||
} finally {
|
||||
transaction.close();
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void stop() {
|
||||
logger.info("RollingFile sink {} stopping...", getName());
|
||||
sinkCounter.stop();
|
||||
super.stop();
|
||||
|
||||
if (outputStream != null) {
|
||||
logger.debug("Closing file {}", pathController.getCurrentFile());
|
||||
|
||||
try {
|
||||
serializer.flush();
|
||||
serializer.beforeClose();
|
||||
outputStream.close();
|
||||
sinkCounter.incrementConnectionClosedCount();
|
||||
if (useCopy) {
|
||||
if (!copyLogFile(pathController.getCurrentFile())) {
|
||||
logger.error("Copy completed file failed");
|
||||
throw new IOException("Copy completed file failed");
|
||||
}
|
||||
}
|
||||
//文件名加后缀、移动文件
|
||||
if (!rename(pathController.getCurrentFile())) {
|
||||
logger.error("Rename completed file failed");
|
||||
throw new IOException("Ranme completed file failed");
|
||||
}
|
||||
} catch (IOException e) {
|
||||
sinkCounter.incrementConnectionFailedCount();
|
||||
logger.error("Unable to close output stream. Exception follows.", e);
|
||||
} finally {
|
||||
outputStream = null;
|
||||
serializer = null;
|
||||
}
|
||||
}
|
||||
if (rollInterval > 0) {
|
||||
rollService.shutdown();
|
||||
|
||||
while (!rollService.isTerminated()) {
|
||||
try {
|
||||
rollService.awaitTermination(1, TimeUnit.SECONDS);
|
||||
} catch (InterruptedException e) {
|
||||
logger
|
||||
.debug(
|
||||
"Interrupted while waiting for roll service to stop. " +
|
||||
"Please report this.", e);
|
||||
}
|
||||
}
|
||||
}
|
||||
logger.info("RollingFile sink {} stopped. Event metrics: {}",
|
||||
getName(), sinkCounter);
|
||||
}
|
||||
|
||||
public File getDirectory() {
|
||||
return directory;
|
||||
}
|
||||
|
||||
public void setDirectory(File directory) {
|
||||
this.directory = directory;
|
||||
}
|
||||
|
||||
public long getRollInterval() {
|
||||
return rollInterval;
|
||||
}
|
||||
|
||||
public void setRollInterval(long rollInterval) {
|
||||
this.rollInterval = rollInterval;
|
||||
}
|
||||
|
||||
private boolean rename(File current) {
|
||||
if (current.length() == 0L) {
|
||||
logger.info("Delete empty file{}", current.getName());
|
||||
return current.delete();
|
||||
}
|
||||
if (useFileSuffix && moveFile) {
|
||||
return current.renameTo(new File(this.targetDirectory, removeFileSuffix(current) + fileSuffix));
|
||||
} else if (useFileSuffix) {
|
||||
return current.renameTo(new File(this.directory, removeFileSuffix(current) + fileSuffix));
|
||||
} else if (moveFile) {
|
||||
return current.renameTo(new File(this.targetDirectory, removeFileSuffix(current)));
|
||||
} else {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
private String removeFileSuffix(File current) {
|
||||
return current.getName().substring(0, current.getName().lastIndexOf("."));
|
||||
}
|
||||
|
||||
private boolean copyLogFile(File current) throws IOException {
|
||||
if (current.length() == 0L) {
|
||||
logger.info("Delete empty file{}", current.getName());
|
||||
return current.delete();
|
||||
}
|
||||
for (File targetDir : this.copyDirectory) {
|
||||
File targetFile = new File(targetDir.getAbsolutePath(), removeFileSuffix(current) + fileSuffix);
|
||||
boolean copyResult = this.copyFile(current, targetFile, false);
|
||||
if (!copyResult) return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
/**
|
||||
* 复制单个文件
|
||||
*
|
||||
* @param srcFile 待复制的文件名
|
||||
* @param destFile 目标文件名
|
||||
* @param overlay 如果目标文件存在，是否覆盖
|
||||
* @return 如果复制成功返回true，否则返回false
|
||||
*/
|
||||
public boolean copyFile(File srcFile, File destFile, boolean overlay) throws IOException {
|
||||
// 判断源文件是否存在
|
||||
if (!srcFile.exists()) {
|
||||
throw new IOException("Copy file failed, source file does not exists");
|
||||
} else if (!srcFile.isFile()) {
|
||||
String MESSAGE = "复制文件失败，源文件：" + srcFile.getName() + "不是一个文件！";
|
||||
throw new IOException("Copy file failed, source file is not a file");
|
||||
}
|
||||
|
||||
// 判断目标文件是否存在
|
||||
if (destFile.exists()) {
|
||||
// 如果目标文件存在并允许覆盖
|
||||
if (overlay) {
|
||||
// 删除已经存在的目标文件，无论目标文件是目录还是单个文件
|
||||
destFile.delete();
|
||||
}
|
||||
} else {
|
||||
// 如果目标文件所在目录不存在，则创建目录
|
||||
if (!destFile.getParentFile().exists()) {
|
||||
// 目标文件所在目录不存在
|
||||
if (!destFile.getParentFile().mkdirs()) {
|
||||
// 复制文件失败：创建目标文件所在目录失败
|
||||
return false;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 复制文件
|
||||
int byteread = 0; // 读取的字节数
|
||||
InputStream in = null;
|
||||
OutputStream out = null;
|
||||
|
||||
try {
|
||||
in = new FileInputStream(srcFile);
|
||||
out = new FileOutputStream(destFile);
|
||||
byte[] buffer = new byte[1024];
|
||||
|
||||
while ((byteread = in.read(buffer)) != -1) {
|
||||
out.write(buffer, 0, byteread);
|
||||
}
|
||||
return true;
|
||||
} catch (FileNotFoundException e) {
|
||||
return false;
|
||||
} catch (IOException e) {
|
||||
return false;
|
||||
} finally {
|
||||
try {
|
||||
if (out != null)
|
||||
out.close();
|
||||
if (in != null)
|
||||
in.close();
|
||||
} catch (IOException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user