/*
* Copyright 2012-2017 the original author or authors.
*
* Licensed 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.springframework.boot.actuate.metrics.statsd;
import java.io.Closeable;
import com.timgroup.statsd.NonBlockingStatsDClient;
import com.timgroup.statsd.StatsDClient;
import com.timgroup.statsd.StatsDClientErrorHandler;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.boot.actuate.metrics.Metric;
import org.springframework.boot.actuate.metrics.writer.Delta;
import org.springframework.boot.actuate.metrics.writer.MetricWriter;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* A {@link MetricWriter} that pushes data to statsd. Statsd has the concept of counters
* and gauges, but only supports gauges with data type Long, so values will be truncated
* towards zero. Metrics whose name contains "timer." (but not "gauge." or "counter.")
* will be treated as execution times (in statsd terms). Anything incremented is treated
* as a counter, and anything with a snapshot value in {@link #set(Metric)} is treated as
* a gauge.
*
* @author Dave Syer
* @author Odín del Río
* @since 1.3.0
*/
public class StatsdMetricWriter implements MetricWriter, Closeable {
private static final Log logger = LogFactory.getLog(StatsdMetricWriter.class);
private final StatsDClient client;
/**
* Create a new writer instance with the given parameters.
* @param host the hostname for the statsd server
* @param port the port for the statsd server
*/
public StatsdMetricWriter(String host, int port) {
this(null, host, port);
}
/**
* Create a new writer with the given parameters.
* @param prefix the prefix to apply to all metric names (can be null)
* @param host the hostname for the statsd server
* @param port the port for the statsd server
*/
public StatsdMetricWriter(String prefix, String host, int port) {
this(new NonBlockingStatsDClient(trimPrefix(prefix), host, port,
new LoggingStatsdErrorHandler()));
}
/**
* Create a new writer with the given client.
* @param client StatsD client to write metrics with
*/
public StatsdMetricWriter(StatsDClient client) {
Assert.notNull(client, "Client must not be null");
this.client = client;
}
private static String trimPrefix(String prefix) {
String trimmedPrefix = StringUtils.hasText(prefix) ? prefix : null;
while (trimmedPrefix != null && trimmedPrefix.endsWith(".")) {
trimmedPrefix = trimmedPrefix.substring(0, trimmedPrefix.length() - 1);
}
return trimmedPrefix;
}
@Override
public void increment(Delta<?> delta) {
this.client.count(sanitizeMetricName(delta.getName()),
delta.getValue().longValue());
}
@Override
public void set(Metric<?> value) {
String name = sanitizeMetricName(value.getName());
if (name.contains("timer.") && !name.contains("gauge.")
&& !name.contains("counter.")) {
this.client.recordExecutionTime(name, value.getValue().longValue());
}
else {
if (name.contains("counter.")) {
this.client.count(name, value.getValue().longValue());
}
else {
this.client.gauge(name, value.getValue().doubleValue());
}
}
}
@Override
public void reset(String name) {
// Not implemented
}
@Override
public void close() {
this.client.stop();
}
/**
* Sanitize the metric name if necessary.
* @param name The metric name
* @return The sanitized metric name
*/
private String sanitizeMetricName(String name) {
return name.replace(":", "-");
}
private static final class LoggingStatsdErrorHandler
implements StatsDClientErrorHandler {
@Override
public void handle(Exception e) {
logger.debug("Failed to write metric. Exception: " + e.getClass()
+ ", message: " + e.getMessage());
}
}
}