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module ActiveSupport
# Many backtraces include too much information that's not relevant for the context. This makes it hard to find the signal
# in the backtrace and adds debugging time. With a BacktraceCleaner, you can setup filters and silencers for your particular
# context, so only the relevant lines are included.
#
# If you need to reconfigure an existing BacktraceCleaner, like the one in Rails, to show as much as possible, you can always
# call BacktraceCleaner#remove_silencers!
#
# Example:
#
# bc = BacktraceCleaner.new
# bc.add_filter { |line| line.gsub(Rails.root, '') }
# bc.add_silencer { |line| line =~ /mongrel|rubygems/ }
# bc.clean(exception.backtrace) # will strip the Rails.root prefix and skip any lines from mongrel or rubygems
#
# Inspired by the Quiet Backtrace gem by Thoughtbot.
class BacktraceCleaner
def initialize
@filters, @silencers = [], []
end
# Returns the backtrace after all filters and silencers has been run against it. Filters run first, then silencers.
def clean(backtrace)
silence(filter(backtrace))
end
# Adds a filter from the block provided. Each line in the backtrace will be mapped against this filter.
#
# Example:
#
# # Will turn "/my/rails/root/app/models/person.rb" into "/app/models/person.rb"
# backtrace_cleaner.add_filter { |line| line.gsub(Rails.root, '') }
def add_filter(&block)
@filters << block
end
# Adds a silencer from the block provided. If the silencer returns true for a given line, it'll be excluded from the
# clean backtrace.
#
# Example:
#
# # Will reject all lines that include the word "mongrel", like "/gems/mongrel/server.rb" or "/app/my_mongrel_server/rb"
# backtrace_cleaner.add_silencer { |line| line =~ /mongrel/ }
def add_silencer(&block)
@silencers << block
end
# Will remove all silencers, but leave in the filters. This is useful if your context of debugging suddenly expands as
# you suspect a bug in the libraries you use.
def remove_silencers!
@silencers = []
end
private
def filter(backtrace)
@filters.each do |f|
backtrace = backtrace.map { |line| f.call(line) }
end
backtrace
end
def silence(backtrace)
@silencers.each do |s|
backtrace = backtrace.reject { |line| s.call(line) }
end
backtrace
end
end
end
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