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Versions: 8
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Contents
class Wolverine
# Reformats errors raised by redis representing failures while executing
# a lua script. The default errors have confusing messages and backtraces,
# and a type of +RuntimeError+. This class improves the message and
# modifies the backtrace to include the lua script itself in a reasonable
# way.
class LuaError < StandardError
PATTERN = /ERR Error (compiling|running) script \(.*?\): .*?:(\d+): (.*)/
WOLVERINE_LIB_PATH = File.expand_path('../../', __FILE__)
# Is this error one that should be reformatted?
#
# @param error [StandardError] the original error raised by redis
# @return [Boolean] is this an error that should be reformatted?
def self.intercepts? error
error.message =~ PATTERN
end
# Initialize a new {LuaError} from an existing redis error, adjusting
# the message and backtrace in the process.
#
# @param error [StandardError] the original error raised by redis
# @param file [Pathname] full path to the lua file the error ocurred in
def initialize error, file
@error = error
@file = file
@error.message =~ PATTERN
stage, line_number, message = $1, $2, $3
super message
set_backtrace generate_backtrace file, line_number
end
private
def generate_backtrace(file, line_number)
pre_wolverine = backtrace_before_entering_wolverine(@error.backtrace)
index_of_first_wolverine_line = (@error.backtrace.size - pre_wolverine.size - 1)
pre_wolverine.unshift(@error.backtrace[index_of_first_wolverine_line])
pre_wolverine.unshift("#{file}:#{line_number}")
pre_wolverine
end
def backtrace_before_entering_wolverine(backtrace)
backtrace.reverse.take_while { |line| ! line_from_wolverine(line) }.reverse
end
def line_from_wolverine(line)
line.split(':').first.include?(WOLVERINE_LIB_PATH)
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems