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GUACAMOLE-374: Allow log level to be configured easily with "log-level" property.

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This commit is contained in:
Michael Jumper
2024-04-23 10:11:16 -07:00
parent acaee44a53
commit 649492b412
7 changed files with 257 additions and 93 deletions
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25
guacamole/src/main/java/org/apache/guacamole/GuacamoleServletContextListener.java
View File

@@ -240,13 +240,24 @@ public class GuacamoleServletContextListener extends GuiceServletContextListener
return current;
// Create new injector if necessary
Injector injector = Guice.createInjector(Stage.PRODUCTION,
new EnvironmentModule(environment),
new LogModule(environment),
new ExtensionModule(environment),
new RESTServiceModule(sessionMap),
new TunnelModule()
);
Injector injector =
// Ensure environment and logging are configured FIRST ...
Guice.createInjector(Stage.PRODUCTION,
new EnvironmentModule(environment),
new LogModule(environment)
)
// ... before attempting configuration of any other modules
// (logging within the constructors of other modules may
// otherwise default to including messages from the "debug"
// level, regardless of how the application log level is
// actually configured)
.createChildInjector(
new ExtensionModule(environment),
new RESTServiceModule(sessionMap),
new TunnelModule()
);
return injector;

163
guacamole/src/main/java/org/apache/guacamole/log/LogLevel.java Normal file
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@@ -0,0 +1,163 @@
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.guacamole.log;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import org.apache.guacamole.properties.EnumGuacamoleProperty.PropertyValue;
/**
* All log levels supported by the Apache Guacamole web application. Each log
* level describes a different level of verbosity for the log messages included
* in web application logs.
*/
public enum LogLevel {
/**
* Errors that are fatal in the context of the operation being logged.
*/
@PropertyValue("error")
ERROR("error"),
/**
* Non-fatal conditions that may indicate the presence of a problem.
*/
@PropertyValue("warning")
@PropertyValue("warn")
WARNING("warning"),
/**
* Informational messages of general interest to users or administrators.
*/
@PropertyValue("info")
INFO("info"),
/**
* Informational messages that are useful for debugging, but are generally
* not useful to users or administrators. It is expected that debug-level
* messages, while verbose, will not affect performance.
*/
@PropertyValue("debug")
DEBUG("debug"),
/**
* Informational messages that may be useful for debugging, but which are
* so low-level that they may affect performance.
*/
@PropertyValue("trace")
TRACE("trace");
/**
* Format string whose sole format argument is a String containing the
* name of the log level. As this configuration will be fed to Logback, the
* name used must be a name acceptable by Logback.
*/
private static final String LOGBACK_XML_TEMPLATE =
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
+ "<configuration>\n"
+ "\n"
+ " <!-- Default appender -->\n"
+ " <appender name=\"GUAC-DEFAULT\" class=\"ch.qos.logback.core.ConsoleAppender\">\n"
+ " <encoder>\n"
+ " <pattern>%%d{HH:mm:ss.SSS} [%%thread] %%-5level %%logger{36} - %%msg%%n</pattern>\n"
+ " </encoder>\n"
+ " </appender>\n"
+ "\n"
+ " <!-- Log at level defined with \"log-level\" property -->\n"
+ " <root level=\"%s\">\n"
+ " <appender-ref ref=\"GUAC-DEFAULT\" />\n"
+ " </root>\n"
+ "\n"
+ "</configuration>\n";
/**
* The name that should be used to refer to this log level in the context
* of configuring Guacamole. This name should be both descriptive and
* acceptable as the value of the "log-level" property.
*/
private final String canonicalName;
/**
* The raw contents of the "logback.xml" that configures Logback to log
* messages at this level, encoded as UTF-8.
*/
private final byte[] logbackConfig;
/**
* Creates a new LogLevel with the given names. The pair of names provided
* correspond to the name used within Guacamole's configuration and the
* name used within Logback's configuration.
*
* @param canonicalName
* The name that should be used for this log level when configuring
* Guacamole to log at this level using the "log-level" property.
*
* @param logbackLogLevel
* The name that would be provided to Logback to log at this level if
* manually configuring Logback using "logback.xml".
*/
private LogLevel(String canonicalName, String logbackLogLevel) {
this.canonicalName = canonicalName;
this.logbackConfig = String.format(LOGBACK_XML_TEMPLATE, logbackLogLevel).getBytes(StandardCharsets.UTF_8);
}
/**
* Creates a new LogLevel with the given name. The provided name corresponds
* to both the name used within Guacamole's configuration and the name used
* within Logback's configuration.
*
* @param logLevel
* The name that should be used for this log level when configuring
* Guacamole to log at this level using the "log-level" property AND
* when manually configuring Logback to log at this level using a
* "logback.xml" configuration file.
*/
private LogLevel(String logLevel) {
this(logLevel, logLevel);
}
/**
* Returns a name that may be used to refer to this log level when
* configuring Guacamole using the "log-level" property.
*
* @return
* A name that may be used to refer to this log level when
* configuring Guacamole using the "log-level" property.
*/
public String getCanonicalName() {
return canonicalName;
}
/**
* Returns a new InputStream that streams the contents of an XML
* configuration file that can be provided to Logback to configure logging
* at this log level.
*
* @return
* A a new InputStream that streams the contents of an XML
* configuration file that can be provided to Logback to configure
* logging at this log level.
*/
public InputStream getLogbackConfiguration() {
return new ByteArrayInputStream(logbackConfig);
}
}

88
guacamole/src/main/java/org/apache/guacamole/log/LogModule.java
View File

@@ -25,7 +25,13 @@ import ch.qos.logback.core.joran.spi.JoranException;
import ch.qos.logback.core.util.StatusPrinter;
import com.google.inject.AbstractModule;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import org.apache.guacamole.GuacamoleException;
import org.apache.guacamole.environment.Environment;
import org.apache.guacamole.properties.EnumGuacamoleProperty;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@@ -44,6 +50,19 @@ public class LogModule extends AbstractModule {
*/
private final Environment environment;
/**
* Property that specifies the highest level of verbosity that Guacamole
* should use for the messages in its logs.
*/
private static final EnumGuacamoleProperty<LogLevel> LOG_LEVEL = new EnumGuacamoleProperty<LogLevel>(LogLevel.class) {
@Override
public String getName() {
return "log-level";
}
};
/**
* Creates a new LogModule which uses the given environment to determine
* the logging configuration.
@@ -54,26 +73,57 @@ public class LogModule extends AbstractModule {
public LogModule(Environment environment) {
this.environment = environment;
}
/**
* Returns an InputStream that streams the contents of the "logback.xml"
* file that Logback should read to configure logging to Guacamole. If the
* user provided their own "logback.xml" within GUACAMOLE_HOME, this will
* be an InputStream that reads the contents of that file. The required
* "logback.xml" will otherwise be dynamically generated based on the value
* of the "log-level" property.
*
* @return
* An InputStream that streams the contents of the "logback.xml" file
* that Logback should read to configure logging to Guacamole.
*/
private InputStream getLogbackConfiguration() {
// Check for custom logback.xml
File logbackFile = new File(environment.getGuacamoleHome(), "logback.xml");
if (logbackFile.exists()) {
try {
logger.info("Loading logback configuration from \"{}\".", logbackFile);
return new FileInputStream(logbackFile);
}
catch (FileNotFoundException e) {
logger.info("Logback configuration could not be read "
+ "from \"{}\": {}", logbackFile, e.getMessage());
}
}
// Default to generating an internal logback.xml based on a simple
// "log-level" property
LogLevel level;
try {
level = environment.getProperty(LOG_LEVEL, LogLevel.INFO);
logger.info("Logging will be at the \"{}\" level.", level.getCanonicalName());
}
catch (GuacamoleException e) {
level = LogLevel.INFO;
logger.error("Falling back to \"{}\" log level: {}", level.getCanonicalName(), e.getMessage());
}
return level.getLogbackConfiguration();
}
@Override
protected void configure() {
// Only load logback configuration if GUACAMOLE_HOME exists
File guacamoleHome = environment.getGuacamoleHome();
if (!guacamoleHome.isDirectory())
return;
try (InputStream logbackConfiguration = getLogbackConfiguration()) {
// Check for custom logback.xml
File logbackConfiguration = new File(guacamoleHome, "logback.xml");
if (!logbackConfiguration.exists())
return;
logger.info("Loading logback configuration from \"{}\".", logbackConfiguration);
LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();
context.reset();
try {
LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();
context.reset();
// Initialize logback
JoranConfigurator configurator = new JoranConfigurator();
@@ -86,7 +136,11 @@ public class LogModule extends AbstractModule {
}
catch (JoranException e) {
logger.error("Initialization of logback failed: {}", e.getMessage());
logger.debug("Unable to load logback configuration..", e);
logger.debug("Unable to load logback configuration.", e);
}
catch (IOException e) {
logger.warn("Logback configuration file could not be cleanly closed: {}", e.getMessage());
logger.debug("Failed to close logback configuration file.", e);
}
}

34
guacamole/src/main/resources/logback.xml
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@@ -1,34 +0,0 @@
<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you 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.
-->
<configuration>
<!-- Default appender -->
<appender name="GUAC-DEFAULT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<!-- Log at INFO level -->
<root level="info">
<appender-ref ref="GUAC-DEFAULT" />
</root>
</configuration>