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Contents
module Logatron
class BacktraceCleaner
# Suppress irrelevant "external" frames. In practice, these are often the frames
# leading up to the "entry point" we care about, whether that's a rails controller
# or a rabbit_stew handler.
#
# Algorithm: partition frames into contiguous external/internal chunks.
# Starting at the bottom, suppress chunks until we find the entry point chunk.
def clean(backtrace)
all_chunks = backtrace.chunk { |x| external_frame?(x) }.to_a.reverse
good_chunks = all_chunks.drop_while { |(is_ext, frames)| !entry_point_chunk?(is_ext, frames) }
bad_chunks = all_chunks.take(all_chunks.size - good_chunks.size)
good_bt = good_chunks.reverse.map(&:last).flatten
bad_bt = bad_chunks.reverse.map(&:last).flatten
good_bt + suppress(bad_bt)
rescue
# if something went wrong, give up on cleaning the backtrace
backtrace
end
private
# heuristic for determining externality of a frame.
# Note: bundle/gems does not include git-sourced gems (those go in
# bundle/bundler/gems), so git-sourced gems are considered internal.
def external_frame?(f)
!!(f =~ %r{bundle/gems})
end
# heuristic for finding the entry point
def entry_point_chunk?(is_ext, frames)
!is_ext && frames.size >= 3
end
def suppress(backtrace)
if backtrace.size <= 3
backtrace
else
[ backtrace.first,
"... #{backtrace.size - 2} frames suppressed ...",
backtrace.last ]
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems