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# Micronaut Logging support
## Features
* Buildin appender:
* console format
* stackdriver format (with support for error reporting)
* logback filter for log-levels per mdc
## Usage
MDC example:
```
logger:
levels:
io.kokuwa: INFO
mdc:
gateway:
level: DEBUG
loggers:
- io.kokuwa
values:
- 6a1bae7f-eb6c-4c81-af9d-dc15396584e2
- fb3318f1-2c73-48e9-acd4-a2be3c9f9256
```
## Build & Release
### Dependency updates
Display dependency updates:
```
mvn versions:display-property-updates -U
```
Update dependencies:
```
mvn versions:update-properties
```
### Release locally
Run:
```
mvn release:prepare release:perform release:clean -B
```
## Open Topics
* tests
* configure mdc on refresh event
* examples and documentation

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pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>io.kokuwa</groupId>
<artifactId>maven-parent</artifactId>
<version>0.1.0</version>
<relativePath />
</parent>
<groupId>io.kokuwa.micronaut</groupId>
<artifactId>micronaut-logging</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Micronaut Logging Support</name>
<description>TODO</description>
<url>https://github.com/kokuwaio/micronaut-logging</url>
<inceptionYear>2020</inceptionYear>
<licenses>
<license>
<name>Apache License 2.0</name>
<url>https://www.apache.org/licenses/LICENSE-2.0</url>
</license>
</licenses>
<scm>
<url>https://github.com/kokuwaio/micronaut-logging</url>
<connection>scm:git:https://github.com/kokuwaio/micronaut-logging.git</connection>
<developerConnection>scm:git:https://github.com/kokuwaio/micronaut-logging.git</developerConnection>
<tag>HEAD</tag>
</scm>
<issueManagement>
<system>github</system>
<url>https://github.com/kokuwaio/micronaut-logging/issues</url>
</issueManagement>
<properties>
<!-- ===================================================================== -->
<!-- ============================= Libaries ============================== -->
<!-- ===================================================================== -->
<version.ch.qos.logback.contrib>0.1.5</version.ch.qos.logback.contrib>
<version.io.micronaut>2.0.1</version.io.micronaut>
</properties>
<dependencyManagement>
<dependencies>
<!-- micronaut -->
<dependency>
<groupId>io.micronaut</groupId>
<artifactId>micronaut-bom</artifactId>
<version>${version.io.micronaut}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!-- logback -->
<dependency>
<groupId>ch.qos.logback.contrib</groupId>
<artifactId>logback-json-classic</artifactId>
<version>${version.ch.qos.logback.contrib}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback.contrib</groupId>
<artifactId>logback-json-core</artifactId>
<version>${version.ch.qos.logback.contrib}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback.contrib</groupId>
<artifactId>logback-jackson</artifactId>
<version>${version.ch.qos.logback.contrib}</version>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<!-- micronaut -->
<dependency>
<groupId>io.micronaut</groupId>
<artifactId>micronaut-runtime</artifactId>
<scope>provided</scope>
</dependency>
<!-- logging -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
</dependency>
<dependency>
<groupId>ch.qos.logback.contrib</groupId>
<artifactId>logback-jackson</artifactId>
</dependency>
<dependency>
<groupId>ch.qos.logback.contrib</groupId>
<artifactId>logback-json-classic</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<!-- add compiler processors -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<annotationProcessorPaths>
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${version.org.projectlombok}</version>
</path>
<path>
<groupId>io.micronaut</groupId>
<artifactId>micronaut-inject-java</artifactId>
<version>${version.io.micronaut}</version>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
</plugins>
</build>
</project>

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src/main/java/io/kokuwa/micronaut/logging/MDCTurboFilter.java Normal file
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package io.kokuwa.micronaut.logging;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.slf4j.MDC;
import org.slf4j.Marker;
import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.turbo.TurboFilter;
import ch.qos.logback.core.Context;
import ch.qos.logback.core.spi.FilterReply;
/**
* Filter for log levels based on mdc.
*
* @author Stephan Schnabel
*/
public class MDCTurboFilter extends TurboFilter {
private final String key;
private final Map<String, Boolean> cache = new HashMap<>();
private final Set<String> loggers = new HashSet<>();
private final Set<String> values = new HashSet<>();
private Level level;
public MDCTurboFilter(String name, String key, Context context) {
this.key = key;
this.level = Level.TRACE;
this.setName(name);
this.setContext(context);
}
public MDCTurboFilter setLoggers(Set<String> loggers) {
this.cache.clear();
this.loggers.clear();
this.loggers.addAll(loggers);
return this;
}
public MDCTurboFilter setValues(Set<String> values) {
this.values.clear();
this.values.addAll(values);
return this;
}
public MDCTurboFilter setLevel(Level level) {
this.level = level;
return this;
}
@Override
public FilterReply decide(Marker marker, Logger logger, Level level, String format, Object[] params, Throwable t) {
if (logger == null || !isStarted() || values.isEmpty() || loggers.isEmpty()) {
return FilterReply.NEUTRAL;
}
var value = MDC.get(key);
if (value == null || !values.contains(value)) {
return FilterReply.NEUTRAL;
}
var isLoggerIncluded = !cache.computeIfAbsent(logger.getName(), k -> loggers.stream().anyMatch(k::startsWith));
if (isLoggerIncluded) {
return FilterReply.NEUTRAL;
}
return level.isGreaterOrEqual(this.level) ? FilterReply.ACCEPT : FilterReply.NEUTRAL;
}
}

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src/main/java/io/kokuwa/micronaut/logging/MDCTurboFilterConfigurer.java Normal file
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package io.kokuwa.micronaut.logging;
import java.util.Objects;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.LoggerContext;
import io.micronaut.context.annotation.BootstrapContextCompatible;
import io.micronaut.context.annotation.Context;
import io.micronaut.context.annotation.Requires;
import io.micronaut.context.env.Environment;
import io.micronaut.context.event.ApplicationEventListener;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.type.Argument;
import io.micronaut.runtime.context.scope.refresh.RefreshEvent;
/**
* Configure mdc filter.
*
* @author Stephan Schnabel
*/
@BootstrapContextCompatible
@Context
@Requires(classes = LoggerContext.class)
@Requires(property = MDCTurboFilterConfigurer.LOGGER_MDCS_PROPERTY_PREFIX)
@Internal
public class MDCTurboFilterConfigurer implements ApplicationEventListener<RefreshEvent> {
public static final String LOGGER_MDCS_PROPERTY_PREFIX = "logger.mdc";
private static final Logger log = LoggerFactory.getLogger(MDCTurboFilterConfigurer.class);
private final LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();
private final Environment environment;
public MDCTurboFilterConfigurer(Environment environment) {
this.environment = environment;
configure();
}
@Override
public void onApplicationEvent(RefreshEvent event) {
if (event.getSource().keySet().stream().anyMatch(key -> key.startsWith(LOGGER_MDCS_PROPERTY_PREFIX))) {
configure();
}
}
private void configure() {
for (var name : environment.getPropertyEntries(LOGGER_MDCS_PROPERTY_PREFIX)) {
var prefix = LOGGER_MDCS_PROPERTY_PREFIX + "." + name + ".";
var key = environment.getProperty(prefix + "key", String.class, name);
var loggers = environment.getProperty(prefix + "loggers", Argument.setOf(String.class)).orElseGet(Set::of);
var values = environment.getProperty(prefix + "values", Argument.setOf(String.class)).orElseGet(Set::of);
var level = Level.valueOf(environment.getProperty(prefix + "level", String.class, Level.TRACE.toString()));
getFilter(name, key).setLoggers(loggers).setValues(values).setLevel(level);
log.info("Configured MDC filter {} for key {} with level {}.", name, key, level);
}
}
private MDCTurboFilter getFilter(String name, String key) {
// get filter
var filterName = LOGGER_MDCS_PROPERTY_PREFIX + "." + key;
var filterOptional = context.getTurboFilterList().stream()
.filter(f -> Objects.equals(filterName, f.getName()))
.filter(MDCTurboFilter.class::isInstance)
.map(MDCTurboFilter.class::cast)
.findAny();
if (filterOptional.isPresent()) {
return filterOptional.get();
}
// add filter
var filter = new MDCTurboFilter(name, key, context);
filter.start();
context.addTurboFilter(filter);
return filter;
}
}

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src/main/java/io/kokuwa/micronaut/logging/StackdriverJsonLayout.java Normal file
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package io.kokuwa.micronaut.logging;
import java.time.Instant;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.contrib.jackson.JacksonJsonFormatter;
import ch.qos.logback.contrib.json.classic.JsonLayout;
import io.micronaut.core.util.StringUtils;
import lombok.Getter;
import lombok.Setter;
/**
* Stackdriver layout.
*
* @author Stephan Schnabel
* @see "https://cloud.google.com/logging/docs/agent/configuration#process-payload"
* @see "https://cloud.google.com/error-reporting/reference/rest/v1beta1/ServiceContext"
*/
@Getter
@Setter
public class StackdriverJsonLayout extends JsonLayout {
private static final String TIMESTAMP_ATTR_NAME = "time";
private static final String SEVERITY_ATTR_NAME = "severity";
private Map<String, String> serviceContext;
private String serviceName;
private String serviceVersion;
private boolean includeExceptionInMessage;
public StackdriverJsonLayout() {
appendLineSeparator = true;
includeContextName = false;
includeMessage = true;
includeExceptionInMessage = true;
setJsonFormatter(new JacksonJsonFormatter());
}
@Override
protected Map<String, Object> toJsonMap(ILoggingEvent event) {
var map = new LinkedHashMap<String, Object>();
add(TIMESTAMP_ATTR_NAME, includeTimestamp, Instant.ofEpochMilli(event.getTimeStamp()).toString(), map);
add(SEVERITY_ATTR_NAME, includeLevel, String.valueOf(event.getLevel()), map);
add(THREAD_ATTR_NAME, includeThreadName, event.getThreadName(), map);
add(CONTEXT_ATTR_NAME, includeContextName, event.getLoggerContextVO().getName(), map);
add(LOGGER_ATTR_NAME, includeLoggerName, event.getLoggerName(), map);
addMap(MDC_ATTR_NAME, includeMDC, event.getMDCPropertyMap(), map);
add(FORMATTED_MESSAGE_ATTR_NAME, includeFormattedMessage, event.getFormattedMessage(), map);
add(MESSAGE_ATTR_NAME, includeMessage, event.getMessage(), map);
addThrowableInfo(JsonLayout.EXCEPTION_ATTR_NAME, includeException, event, map);
addServiceContext(map);
return map;
}
private void addServiceContext(Map<String, Object> map) {
if (serviceContext == null) {
serviceContext = new HashMap<>(2);
if (StringUtils.isNotEmpty(serviceName)) {
serviceContext.put("service", serviceName);
}
if (StringUtils.isNotEmpty(serviceVersion)) {
serviceContext.put("version", serviceVersion);
}
}
if (!serviceContext.isEmpty()) {
map.put("serviceContext", serviceContext);
}
}
}

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src/main/resources/logback.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<property resource="META-INF/build-info.properties" />
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<withJansi>true</withJansi>
<encoder>
<pattern>%cyan(%d{HH:mm:ss.SSS}) %gray(%-6.6thread) %highlight(%-5level) %magenta(%32logger{32}) %mdc %msg%n</pattern>
</encoder>
</appender>
<appender name="STACKDRIVER" class="ch.qos.logback.core.ConsoleAppender">
<encoder class="ch.qos.logback.core.encoder.LayoutWrappingEncoder">
<layout class="io.kokuwa.micronaut.logging.StackdriverJsonLayout">
<serviceName>${serviceName}</serviceName>
<serviceVersion>${serviceVersion}</serviceVersion>
</layout>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="${LOGBACK_APPENDER:-CONSOLE}" />
</root>
</configuration>