logback-awslogs-appender

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logback-awslogs-appender

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An Amazon Web Services (AWS) Logs (CloudWatch) appender for Logback

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# Logback AWSLogs appender

An [Amazon Web Services](https://aws.amazon.com) [CloudWatch Logs](http://docs.aws.amazon.com/AmazonCloudWatchLogs/latest/APIReference/Welcome.html) [appender](http://logback.qos.ch/manual/appenders.html) for [Logback](http://logback.qos.ch/).

Thank you for your help:
- [ivanfmartinez](https://github.com/ivanfmartinez)
- [jochenschneider](https://github.com/jochenschneider)
- [malkusch](https://github.com/malkusch)
- [robertoestivill](https://github.com/robertoestivill)

## Quick start

### `pom.xml`:

```xml
<project>
    <dependencies>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.21</version>
        </dependency>
        <dependency>
            <groupId>ca.pjer</groupId>
            <artifactId>logback-awslogs-appender</artifactId>
            <version>1.4.0</version>
        </dependency>
    </dependencies>
</project>
```

### `logback.xml`

The simplest config that actually (synchronously) send logs to CloudWatch (see [More configurations section](#more-configurations) for a real life example):

```xml
<configuration>

</configuration>
```

With every possible defaults:
- The Layout will default to [EchoLayout](http://logback.qos.ch/apidocs/ch/qos/logback/core/layout/EchoLayout.html).
- The Log Group Name will default to `AwsLogsAppender`.
- The Log Stream Name will default to a timestamp formated with `yyyyMMdd'T'HHmmss`.
- The AWS Region will default to the AWS SDK default region (`us-east-1`) or the current instance region.
- The `maxFlushTimeMillis` will default to `0`, so appender is in synchronous mode.

`AwsLogsAppender` will search for AWS Credentials using the [DefaultAWSCredentialsProviderChain](http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/auth/DefaultAWSCredentialsProviderChain.html).

The foud Credentials must have at least this [Role Policy](http://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_manage.html):

```json
{
  "Statement": [
    {
      "Action": [
        "logs:CreateLogGroup",
        "logs:CreateLogStream",
        "logs:PutLogEvents"
      ],
      "Effect": "Allow",
      "Resource": "arn:aws:logs:*:*:*"
    }
  ]
}
```

### Code

As usual with [SLF4J](http://www.slf4j.org/):

```java
// get a logger
org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(MyClass.class);

// log
logger.info("HelloWorld");
```

## More configurations

It may be worth quoting this from _AWS_, beacause this is why we need to have unique `logStreamName`:

> When you have two processes attempting to perform the PutLogEvents API call to the same log stream, there is a chance that one will pass and one will fail because of the sequence token provided for that same log stream. Because of the sequencing of these events maintained in the log stream, you cannot have concurrently running processes pushing to the same log-stream.

A real life `logback.xml` would probably look like this (when all options are specified):

```xml
<configuration packagingData="true">

<shutdownHook class="ch.qos.logback.core.hook.DelayingShutdownHook"/>

<timestamp key="timestamp" datePattern="yyyyMMddHHmmssSSS"/>

<appender name="ASYNC_AWS_LOGS" class="ca.pjer.logback.AwsLogsAppender">

<filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>WARN</level>
        </filter>

<layout>
            <pattern>%d{yyyyMMdd'T'HHmmss} %thread %level %logger{15} %msg%n</pattern>
        </layout>

<logGroupName>/com/acme/myapp</logGroupName>

<logStreamUuidPrefix>mystream/</logStreamUuidPrefix>

<logRegion>us-west-2</logRegion>

<maxBatchLogEvents>50</maxBatchLogEvents>

<maxFlushTimeMillis>30000</maxFlushTimeMillis>

<maxBlockTimeMillis>5000</maxBlockTimeMillis>

<retentionTimeDays>0</retentionTimeDays>

<accessKeyId>YOUR_ACCESS_KEY_ID</accessKeyId>
        <secretAccessKey>YOUR_SECRET_ACCESS_KEY</secretAccessKey>
    </appender>

<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{yyyyMMdd'T'HHmmss} %thread %level %logger{15} %msg%n</pattern>
        </encoder>
    </appender>

<root level="INFO">
        
        <appender-ref ref="STDOUT"/>
        
        <appender-ref ref="ASYNC_AWS_LOGS"/>
    </root>

</configuration>
```

See [The logback manual - Chapter 3: Logback configuration](http://logback.qos.ch/manual/configuration.html) for more config options.

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