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
# File activesupport/lib/active_support/error_reporter.rb, line 46 def initialize(*subscribers, logger: nil) @subscribers = subscribers.flatten @logger = logger 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
Report any unhandled exception, and swallow it.
Rails.error.handle do 1 + '1' end
# 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
# 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
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 88 def set_context(...) ActiveSupport::ExecutionContext.set(...) end
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 76 def subscribe(subscriber) unless subscriber.respond_to?(:report) raise ArgumentError, "Error subscribers must respond to #report" end @subscribers << subscriber end
Register a new error subscriber. The subscriber must respond to
report(Exception, handled: Boolean, context: Hash)
The report
method should
never raise an error.
© 2004–2021 David Heinemeier Hansson
Licensed under the MIT License.