ActiveSupport::ErrorReporter is a common interface for error reporting services.

To rescue and report any unhandled error, you can use the handle method:

Rails.error.handle do
  do_something!
end

If an error is raised, it will be reported and swallowed.

Alternatively if you want to report the error but not swallow it, you can use record

Rails.error.record do
  do_something!
end

Both methods can be restricted to only handle a specific exception class

maybe_tags = Rails.error.handle(Redis::BaseError) { redis.get("tags") }

You can also pass some extra context information that may be used by the error subscribers:

Rails.error.handle(context: { section: "admin" }) do
  # ...
end

Additionally a severity can be passed along to communicate how important the error report is. severity can be one of :error, :warning or :info. Handled errors default to the :warning severity, and unhandled ones to error.

Both handle and record pass through the return value from the block. In the case of handle rescuing an error, a fallback can be provided. The fallback must be a callable whose result will be returned when the block raises and is handled:

user = Rails.error.handle(fallback: -> { User.anonymous }) do
  User.find_by(params)
end

Methods

Constants

SEVERITIES = %i(error warning info)
 

Attributes

[RW] logger

Class Public methods

new(*subscribers, logger: nil)

# File activesupport/lib/active_support/error_reporter.rb, line 46
def initialize(*subscribers, logger: nil)
  @subscribers = subscribers.flatten
  @logger = logger
end

Instance Public methods

handle(error_class = StandardError, severity: :warning, context: {}, fallback: nil)

Report any unhandled exception, and swallow it.

Rails.error.handle do
  1 + '1'
end
# File activesupport/lib/active_support/error_reporter.rb, line 57
def handle(error_class = StandardError, severity: :warning, context: {}, fallback: nil)
  yield
rescue error_class => error
  report(error, handled: true, severity: severity, context: context)
  fallback.call if fallback
end

record(error_class = StandardError, severity: :error, context: {})

# File activesupport/lib/active_support/error_reporter.rb, line 64
def record(error_class = StandardError, severity: :error, context: {})
  yield
rescue error_class => error
  report(error, handled: false, severity: severity, context: context)
  raise
end

report(error, handled:, severity: handled ? :warning : :error, context: {})

When the block based handle and record methods are not suitable, you can directly use report

Rails.error.report(error, handled: true)
# File activesupport/lib/active_support/error_reporter.rb, line 95
def report(error, handled:, severity: handled ? :warning : :error, context: {})
  unless SEVERITIES.include?(severity)
    raise ArgumentError, "severity must be one of #{SEVERITIES.map(&:inspect).join(", ")}, got: #{severity.inspect}"
  end

  full_context = ActiveSupport::ExecutionContext.to_h.merge(context)
  @subscribers.each do |subscriber|
    subscriber.report(error, handled: handled, severity: severity, context: full_context)
  rescue => subscriber_error
    if logger
      logger.fatal(
        "Error subscriber raised an error: #{subscriber_error.message} (#{subscriber_error.class})\n" +
        subscriber_error.backtrace.join("\n")
      )
    else
      raise
    end
  end

  nil
end

set_context(...)

Update the execution context that is accessible to error subscribers

Rails.error.set_context(section: "checkout", user_id: @user.id)

See ActiveSupport::ExecutionContext.set

# File activesupport/lib/active_support/error_reporter.rb, line 88
def set_context(...)
  ActiveSupport::ExecutionContext.set(...)
end

subscribe(subscriber)

Register a new error subscriber. The subscriber must respond to

report(Exception, handled: Boolean, context: Hash)

The report method should never raise an error.

# File activesupport/lib/active_support/error_reporter.rb, line 76
def subscribe(subscriber)
  unless subscriber.respond_to?(:report)
    raise ArgumentError, "Error subscribers must respond to #report"
  end
  @subscribers << subscriber
end