co.elastic.apm.agent.sdk.bytebuddy.CustomElementMatchers Maven / Gradle / Ivy
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* this work for additional information regarding copyright
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* 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package co.elastic.apm.agent.sdk.bytebuddy;
import co.elastic.apm.agent.sdk.internal.InternalUtil;
import co.elastic.apm.agent.sdk.logging.Logger;
import co.elastic.apm.agent.sdk.logging.LoggerFactory;
import co.elastic.apm.agent.sdk.internal.util.PrivilegedActionUtils;
import co.elastic.apm.agent.sdk.weakconcurrent.WeakConcurrent;
import co.elastic.apm.agent.sdk.weakconcurrent.WeakMap;
import net.bytebuddy.description.NamedElement;
import net.bytebuddy.description.method.MethodDescription;
import net.bytebuddy.matcher.ElementMatcher;
import javax.annotation.Nullable;
import java.io.File;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.security.CodeSource;
import java.security.ProtectionDomain;
import java.util.Collection;
import java.util.jar.Attributes;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
import static net.bytebuddy.matcher.ElementMatchers.nameContains;
import static net.bytebuddy.matcher.ElementMatchers.nameStartsWith;
import static net.bytebuddy.matcher.ElementMatchers.none;
public class CustomElementMatchers {
private static final Logger logger = LoggerFactory.getLogger(CustomElementMatchers.class);
@Nullable
private static final ClassLoader SELF_CLASS_LOADER = PrivilegedActionUtils.getClassLoader(CustomElementMatchers.class);
private static final CustomElementMatchersProvider supplier = InternalUtil.getServiceProvider(CustomElementMatchersProvider.class);
private static final ElementMatcher.Junction.AbstractBase AGENT_CLASS_LOADER_MATCHER = new ElementMatcher.Junction.AbstractBase() {
@Override
public boolean matches(@Nullable ClassLoader classLoader) {
if (classLoader == SELF_CLASS_LOADER) {
// This one also covers unit tests, where the app class loader loads the agent
return true;
}
return supplier.isAgentClassLoader(classLoader);
}
};
private static final ElementMatcher.Junction.AbstractBase INTERNAL_PLUGIN_CLASS_LOADER_MATCHER = new ElementMatcher.Junction.AbstractBase() {
@Override
public boolean matches(@Nullable ClassLoader classLoader) {
return supplier.isInternalPluginClassLoader(classLoader);
}
};
/**
* Matches the target class loader to a given class loader by instance comparison
*
* @param other the class loader to match to
* @return {@code true} if {@code other} is the same class loader instance as the target class loader
*/
public static ElementMatcher.Junction isSameClassLoader(final ClassLoader other) {
return new ElementMatcher.Junction.AbstractBase() {
@Override
public boolean matches(@Nullable ClassLoader target) {
return target == other;
}
};
}
public static ElementMatcher.Junction isAgentClassLoader() {
return AGENT_CLASS_LOADER_MATCHER;
}
public static ElementMatcher.Junction isInternalPluginClassLoader() {
return INTERNAL_PLUGIN_CLASS_LOADER_MATCHER;
}
public static ElementMatcher.Junction isInAnyPackage(Collection includedPackages,
ElementMatcher.Junction defaultIfEmpty) {
if (includedPackages.isEmpty()) {
return defaultIfEmpty;
}
ElementMatcher.Junction matcher = none();
for (String applicationPackage : includedPackages) {
matcher = matcher.or(nameStartsWith(applicationPackage));
}
return matcher;
}
/**
* Matches only class loaders which can load a certain class.
*
* Warning: the class will be tried to load by each class loader.
* You should choose a class which does not have optional dependencies (imports classes which are not on the class path).
* Ideally, choose an interface or annotation without dependencies.
*
*
* @param className the name of the class to check
* @return a matcher which only matches class loaders which can load a certain class.
*/
public static ElementMatcher.Junction classLoaderCanLoadClass(final String className) {
return new ElementMatcher.Junction.AbstractBase() {
private final boolean loadableByBootstrapClassLoader = canLoadClass(null, className);
private final WeakMap cache = WeakConcurrent.buildMap();
@Override
public boolean matches(@Nullable ClassLoader target) {
if (target == null) {
return loadableByBootstrapClassLoader;
}
Boolean result = cache.get(target);
if (result == null) {
result = canLoadClass(target, className);
cache.put(target, result);
}
return result;
}
};
}
private static boolean canLoadClass(@Nullable ClassLoader target, String className) {
try {
final URL resource;
final String classResource = className.replace('.', '/') + ".class";
if (target == null) {
resource = Object.class.getResource("/" + classResource);
} else {
resource = target.getResource(classResource);
}
return resource != null;
} catch (Exception ignore) {
return false;
}
}
/**
* Matches overridden methods of a super class or implemented methods of an interface.
* Recursively traverses the superclasses and interfaces.
* The the superclasses and interfaces to examine can be limited via {@link MethodHierarchyMatcher#onSuperClassesThat(ElementMatcher)}.
*
* @param methodElementMatcher The matcher which is applied on the method hierarchy
* @return a matcher which is applied on the method hierarchy
*/
public static MethodHierarchyMatcher overridesOrImplementsMethodThat(ElementMatcher methodElementMatcher) {
return new MethodHierarchyMatcher(methodElementMatcher);
}
public static ElementMatcher.Junction isProxy() {
return nameContains("$Proxy")
.or(nameContains("$$"))
.or(nameContains("$JaxbAccessor"))
.or(nameContains("CGLIB"))
.or(nameContains("EnhancerBy"));
}
/**
* A matcher that checks whether the implementation version read from the MANIFEST.MF related for a given {@link ProtectionDomain} is
* lower than or equals to the limit version. Assumes a SemVer version format.
*
* @param version the version to check against
* @return an LTE SemVer matcher
*/
public static ElementMatcher.Junction implementationVersionLte(final String version) {
return implementationVersion(version, Matcher.LTE);
}
public static ElementMatcher.Junction implementationVersionGte(final String version) {
return implementationVersion(version, Matcher.GTE);
}
private static ElementMatcher.Junction implementationVersion(final String version, final Matcher matcher) {
return new ElementMatcher.Junction.AbstractBase() {
/**
* Returns true if the implementation version read from the manifest file referenced by the given
* {@link ProtectionDomain} is lower than or equal to the version set to this matcher
*
* @param protectionDomain a {@link ProtectionDomain} from which to look for the manifest file
* @return true if version parsed from the manifest file is lower than or equals to the matcher's version
*
* NOTE: MAY RETURN FALSE POSITIVES - returns true if matching fails, logging a warning message
*/
@Override
public boolean matches(@Nullable ProtectionDomain protectionDomain) {
try {
Version pdVersion = readImplementationVersionFromManifest(protectionDomain);
if (pdVersion != null) {
Version limitVersion = Version.of(version);
return matcher.match(pdVersion, limitVersion);
}
} catch (Exception e) {
logger.info("Cannot read implementation version based on ProtectionDomain. This should not affect " +
"your agent's functionality. Failed with message: " + e.getMessage());
logger.debug("Implementation version parsing error: " + protectionDomain, e);
}
return true;
}
};
}
@Nullable
private static Version readImplementationVersionFromManifest(@Nullable ProtectionDomain protectionDomain) throws IOException, URISyntaxException {
Version version = null;
JarFile jarFile = null;
try {
if (protectionDomain != null) {
CodeSource codeSource = protectionDomain.getCodeSource();
if (codeSource != null) {
URL jarUrl = codeSource.getLocation();
if (jarUrl != null) {
// does not yet establish an actual connection
URLConnection urlConnection = jarUrl.openConnection();
if (urlConnection instanceof JarURLConnection) {
jarFile = ((JarURLConnection) urlConnection).getJarFile();
} else {
jarFile = new JarFile(new File(jarUrl.toURI()));
}
Manifest manifest = jarFile.getManifest();
if (manifest != null) {
Attributes attributes = manifest.getMainAttributes();
String manifestVersion = attributes.getValue("Implementation-Version");
if (manifestVersion == null) {
// fallback on OSGI bundle version when impl. version not available
manifestVersion = attributes.getValue("Bundle-Version");
}
if (manifestVersion != null) {
version = Version.of(manifestVersion);
}
}
}
}
} else {
logger.info("Cannot read implementation version - got null ProtectionDomain");
}
} finally {
if (jarFile != null) {
try {
jarFile.close();
} catch (IOException e) {
logger.error("Error closing JarFile", e);
}
}
}
return version;
}
private enum Matcher {
LTE {
@Override
> boolean match(T c1, T c2) {
return c1.compareTo(c2) <= 0;
}
},
GTE {
@Override
> boolean match(T c1, T c2) {
return c1.compareTo(c2) >= 0;
}
};
abstract > boolean match(T c1, T c2);
}
public interface CustomElementMatchersProvider {
boolean isAgentClassLoader(@Nullable ClassLoader classLoader);
boolean isInternalPluginClassLoader(@Nullable ClassLoader classLoader);
}
}