class SemanticLogger::Appender::Sentry

def default_formatter

Use Raw Formatter by default 
def default_formatter
  SemanticLogger::Formatters::Raw.new
end

def initialize(level: :error, **args, &block)

Default: SemanticLogger.application
Name of this application to appear in log messages.
application: [String]

Default: SemanticLogger.host
Name of this host to appear in log messages.
host: [String]

The Proc must return true or false.
Proc: Only include log messages where the supplied Proc returns true
regular expression. All other messages will be ignored.
RegExp: Only include log messages where the class name matches the supplied.
filter: [Regexp|Proc]

Default: Use the built-in formatter (See: #call)
the output from this appender
An instance of a class that implements #call, or a Proc to be used to format
formatter: [Object|Proc|Symbol|Hash]

Default: :error
Override the log level for this appender.
level: [:trace | :debug | :info | :warn | :error | :fatal]
Parameters

Create Appender 
def initialize(level: :error, **args, &block)
  # Replace the Sentry Raven logger so that we can identify its log messages and not forward them to Sentry
  Raven.configure { |config| config.logger = SemanticLogger[Raven] }
  super
end

def log(log)

Send an error notification to sentry 
def log(log)
  # Ignore logs coming from Raven itself
  return false if log.name == "Raven"
  context      = formatter.call(log, self)
  user         = context.delete(:user)
  tags         = context.delete(:tags)
  attrs        = {
    level: context.delete(:level),
    extra: context
  }
  attrs[:user] = user if user
  attrs[:tags] = tags if tags
  if log.exception
    context.delete(:exception)
    Raven.capture_exception(log.exception, attrs)
  else
    attrs[:extra][:backtrace] = log.backtrace if log.backtrace
    Raven.capture_message(context[:message], attrs)
  end
  true
end