/*
* Copyright (c) 2016 Network New Technologies Inc.
*
* 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 com.networknt.metrics;
import com.networknt.audit.AuditHandler;
import com.networknt.config.Config;
import com.networknt.handler.MiddlewareHandler;
import com.networknt.server.Server;
import com.networknt.utility.ModuleRegistry;
import com.networknt.utility.Util;
import io.dropwizard.metrics.Clock;
import io.dropwizard.metrics.MetricFilter;
import io.dropwizard.metrics.MetricName;
import io.dropwizard.metrics.MetricRegistry;
import io.dropwizard.metrics.influxdb.InfluxDbHttpSender;
import io.dropwizard.metrics.influxdb.InfluxDbReporter;
import io.dropwizard.metrics.influxdb.InfluxDbSender;
import io.undertow.Handlers;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.net.InetAddress;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
/**
* Created by steve on 03/10/16.
*/
public class MetricsHandler implements MiddlewareHandler {
public static final String CONFIG_NAME = "metrics";
public static MetricsConfig config;
static final MetricRegistry registry = new MetricRegistry();
static final Logger logger = LoggerFactory.getLogger(MetricsHandler.class);
static {
config = (MetricsConfig)Config.getInstance().getJsonObjectConfig(CONFIG_NAME, MetricsConfig.class);
// initialize reporter and start the report scheduler if metrics is enabled
if(config.enabled) {
try {
InfluxDbSender influxDb =
new InfluxDbHttpSender(config.influxdbProtocol, config.influxdbHost, config.influxdbPort,
config.influxdbName, config.influxdbUser, config.influxdbPass);
InfluxDbReporter reporter = InfluxDbReporter
.forRegistry(registry)
.convertRatesTo(TimeUnit.SECONDS)
.convertDurationsTo(TimeUnit.MILLISECONDS)
.filter(MetricFilter.ALL)
.build(influxDb);
reporter.start(config.getReportInMinutes(), TimeUnit.MINUTES);
logger.info("metrics is enabled and reporter is started");
} catch (Exception e) {
// if there are any exception, chances are influxdb is not available. disable this handler.
logger.error("metrics is disabled as it cannot connect to the influxdb", e);
// reset the enabled to false to make sure that server/info reports the right status.
config.setEnabled(false);
}
}
}
private volatile HttpHandler next;
Map<String, String> commonTags = new HashMap<>();
public MetricsHandler() {
commonTags.put("apiName", Server.config.getServiceId());
InetAddress inetAddress = Util.getInetAddress();
commonTags.put("ipAddress", inetAddress.getHostAddress());
commonTags.put("hostname", inetAddress.getHostName()); // will be container id if in docker.
commonTags.put("version", Util.getJarVersion());
//commonTags.put("frameworkVersion", Util.getFrameworkVersion());
// TODO need to find a way to get env to put into the metrics.
}
@Override
public HttpHandler getNext() {
return this.next;
}
@Override
public MiddlewareHandler setNext(final HttpHandler next) {
Handlers.handlerNotNull(next);
this.next = next;
return this;
}
@Override
public void handleRequest(final HttpServerExchange exchange) throws Exception {
long startTime = Clock.defaultClock().getTick();
exchange.addExchangeCompleteListener((exchange1, nextListener) -> {
Map<String, Object> auditInfo = exchange1.getAttachment(AuditHandler.AUDIT_INFO);
if(auditInfo != null) {
Map<String, String> tags = new HashMap<>();
tags.put("endpoint", (String)auditInfo.get("endpoint"));
tags.put("clientId", (String)auditInfo.get("client_id"));
long time = Clock.defaultClock().getTick() - startTime;
MetricName metricName = new MetricName("response_time");
metricName = metricName.tagged(commonTags);
metricName = metricName.tagged(tags);
registry.getOrAdd(metricName, MetricRegistry.MetricBuilder.TIMERS).update(time, TimeUnit.NANOSECONDS);
incCounterForStatusCode(exchange1.getStatusCode(), commonTags, tags);
}
nextListener.proceed();
});
next.handleRequest(exchange);
}
@Override
public boolean isEnabled() {
return config.isEnabled();
}
@Override
public void register() {
ModuleRegistry.registerModule(MetricsHandler.class.getName(), Config.getInstance().getJsonMapConfigNoCache(CONFIG_NAME), null);
}
private void incCounterForStatusCode(int statusCode, Map<String, String> commonTags, Map<String, String> tags) {
MetricName metricName = new MetricName("request").tagged(commonTags).tagged(tags);
registry.getOrAdd(metricName, MetricRegistry.MetricBuilder.COUNTERS).inc();
if(statusCode >= 200 && statusCode < 400) {
metricName = new MetricName("success").tagged(commonTags).tagged(tags);
registry.getOrAdd(metricName, MetricRegistry.MetricBuilder.COUNTERS).inc();
} else if(statusCode == 401 || statusCode == 403) {
metricName = new MetricName("auth_error").tagged(commonTags).tagged(tags);
registry.getOrAdd(metricName, MetricRegistry.MetricBuilder.COUNTERS).inc();
} else if(statusCode >= 400 && statusCode < 500) {
metricName = new MetricName("request_error").tagged(commonTags).tagged(tags);
registry.getOrAdd(metricName, MetricRegistry.MetricBuilder.COUNTERS).inc();
} else if(statusCode >= 500) {
metricName = new MetricName("server_error").tagged(commonTags).tagged(tags);
registry.getOrAdd(metricName, MetricRegistry.MetricBuilder.COUNTERS).inc();
}
}
}