Overview

Send logged messages to AWS CloudWatch Logs using the ruby AWS SDK.

Can be used in place of Ruby's Logger (http://www.ruby-doc.org/stdlib/libdoc/logger/rdoc/)

In fact, it (currently) returns an instance of Logger.

Forked from loggiler.

Usage

require 'cloudwatchlogger'

log = CloudWatchLogger.new({access_key_id: 'YOUR_ACCESS_KEY_ID', secret_access_key: 'YOUR_SECRET_ACCESS_KEY'}, 'YOUR_CLOUDWATCH_LOG_GROUP')

log.info("Hello World from Ruby")

The region will default to the value of the environment variable AWS_REGION. In case you need to pass different region or group's different Log Stream name:

log = CloudWatchLogger.new({
  access_key_id: 'YOUR_ACCESS_KEY_ID',
  secret_access_key: 'YOUR_SECRET_ACCESS_KEY'
}, 'YOUR_CLOUDWATCH_LOG_GROUP', 'YOUR_CLOUDWATCH_LOG_STREAM', region: 'YOUR_CLOUDWATCH_REGION' )

Provding an empty hash instead of credentials will cause the AWS SDK to search the default credential provider chain for credentials, namely:

1. Environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY
2. Amazon ECS container credentials (task role)
3. Instance profile credentials (IAM role)

With Rails

config/environments/production.rb

RailsApplication::Application.configure do
  config.logger = CloudWatchLogger.new({access_key_id: 'YOUR_ACCESS_KEY_ID', secret_access_key: 'YOUR_SECRET_ACCESS_KEY'}, 'YOUR_CLOUDWATCH_LOG_GROUP')
end

With Rails 4

config/initializers/cloudwatchlogger.rb

cloudwatchlogger = CloudWatchLogger.new({access_key_id: 'YOUR_ACCESS_KEY_ID', secret_access_key: 'YOUR_SECRET_ACCESS_KEY'}, 'YOUR_CLOUDWATCH_LOG_GROUP')
Rails.logger.extend(ActiveSupport::Logger.broadcast(cloudwatchlogger))

Logging

CloudWatchLogger.new returns a ruby Logger object, so take a look at:

http://www.ruby-doc.org/stdlib/libdoc/logger/rdoc/

The Logger's logdev has some special format handling though.

Logging a string

log.warn "test"

Will produce the following log message in CloudWatch Logs:

"<Date> severity=WARN, test"

Logging a Hash

log.warn :boom => :box, :bar => :soap

Will produce the following log message in CloudWatch Logs:

"<Date> severity=WARN, boom=box, bar=soap"

Releasing

rake release

Bugs

https://github.com/zshannon/cloudwatchlogger/issues

Pull requests welcome.