Exception: Brpoplpush::RedisScript::LuaError

Inherits:
RuntimeError
  • Object
show all
Defined in:
lib/brpoplpush/redis_script/lua_error.rb

Overview

LuaError raised on errors in Lua scripts

Author:

Constant Summary collapse

PATTERN =

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.

/ERR Error (compiling|running) script \(.*?\): .*?:(\d+): (.*)/.freeze
LIB_PATH = 
File.expand_path("..", __dir__).freeze
CONTEXT_LINE_NUMBER = 
2

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(error, script) ⇒ LuaError

Initialize a new Brpoplpush::RedisScript::LuaError from an existing redis error, adjusting the message and backtrace in the process.

Parameters:

  • error (StandardError) —

    the original error raised by redis

  • script (Script) —

    a DTO with information about the script



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# File 'lib/brpoplpush/redis_script/lua_error.rb', line 43

def initialize(error, script)
  @error        = error
  @file         = script.path
  @content      = script.source
  @backtrace    = @error.backtrace

  @error.message.match(PATTERN) do |regexp_match|
    line_number   = regexp_match[2].to_i
    message       = regexp_match[3]
    error_context = generate_error_context(content, line_number)

    super("#{message}\n\n#{error_context}\n\n")
    set_backtrace(generate_backtrace(file, line_number))
  end
end

Instance Attribute Details

#content ⇒ Object (readonly)

Returns the value of attribute content.



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# File 'lib/brpoplpush/redis_script/lua_error.rb', line 27

def content
  @content
end

#error ⇒ Object (readonly)

Returns the value of attribute error.



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# File 'lib/brpoplpush/redis_script/lua_error.rb', line 27

def error
  @error
end

#file ⇒ Object (readonly)

Returns the value of attribute file.



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# File 'lib/brpoplpush/redis_script/lua_error.rb', line 27

def file
  @file
end

Class Method Details

.intercepts?(error) ⇒ Boolean

Is this error one that should be reformatted?

Parameters:

  • error (StandardError) —

    the original error raised by redis

Returns:

  • (Boolean) —

    is this an error that should be reformatted?



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# File 'lib/brpoplpush/redis_script/lua_error.rb', line 33

def self.intercepts?(error)
  PATTERN.match?(error.message)
end