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Spring Cloud Sleuth AutoConfigure
/*
* Copyright 2013-2021 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
*
* https://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.cloud.sleuth.autoconfig.instrument.web.client;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MapPropertySource;
import org.springframework.core.env.MutablePropertySources;
import org.springframework.core.env.PropertySource;
import org.springframework.util.ClassUtils;
import org.springframework.util.StringUtils;
/**
* Adds default properties for a gateway application.
*
* @author Marcin Grzejszczak
* @since 3.0.0
*/
class TraceGatewayEnvironmentPostProcessor implements EnvironmentPostProcessor {
private static final Log log = LogFactory.getLog(TraceGatewayEnvironmentPostProcessor.class);
private static final String PROPERTY_SOURCE_NAME = "defaultProperties";
@Override
public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
Map map = new HashMap<>();
if (sleuthEnabled(environment) && isGatewayOnTheClasspath()) {
String instrumentationType = environment.getProperty("spring.sleuth.reactor.instrumentation-type");
if (log.isDebugEnabled()) {
log.debug("Found the following instrumentation type [" + instrumentationType + "]");
}
if (StringUtils.isEmpty(instrumentationType)) {
instrumentationType = "manual";
if (log.isDebugEnabled()) {
log.debug("No instrumentation type passed, will force it to [" + instrumentationType + "]");
}
}
map.put("spring.sleuth.reactor.instrumentation-type", instrumentationType);
}
addOrReplace(environment.getPropertySources(), map);
}
private boolean sleuthEnabled(ConfigurableEnvironment environment) {
return Boolean.parseBoolean(environment.getProperty("spring.sleuth.enabled", "true"));
}
private boolean isGatewayOnTheClasspath() {
try {
ClassUtils.forName("org.springframework.cloud.gateway.filter.GatewayFilter", null);
return true;
}
catch (ClassNotFoundException e) {
return false;
}
}
private void addOrReplace(MutablePropertySources propertySources, Map map) {
MapPropertySource target = null;
if (propertySources.contains(PROPERTY_SOURCE_NAME)) {
PropertySource source = propertySources.get(PROPERTY_SOURCE_NAME);
if (source instanceof MapPropertySource) {
target = (MapPropertySource) source;
for (String key : map.keySet()) {
if (!target.containsProperty(key)) {
target.getSource().put(key, map.get(key));
}
}
}
}
if (target == null) {
target = new MapPropertySource(PROPERTY_SOURCE_NAME, map);
}
if (!propertySources.contains(PROPERTY_SOURCE_NAME)) {
propertySources.addLast(target);
}
}
}