From: "rkh (Konstantin Haase)" <me@...>
Date: 2013-04-14T22:33:10+09:00
Subject: [ruby-core:54267] [CommonRuby - Feature #8257] Exception#cause to carry originating exception along with new one


Issue #8257 has been updated by rkh (Konstantin Haase).


I think allowing rescue lines to take other objects besides modules would this would greatly ease building something in user code:

def caused_by(matcher)
  block = proc do |exception|
    matcher === exception or exception.cause && block[exception.cause]
  end
end

begin
  ...
rescue caused_by(NetworkError)
  ...
end

But I guess that's a separate feature request.
----------------------------------------
Feature #8257: Exception#cause to carry originating exception along with new one
https://bugs.ruby-lang.org/issues/8257#change-38542

Author: headius (Charles Nutter)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


Often when a lower-level API raises an exception, we would like to re-raise a different exception specific to our API or library. Currently in Ruby, only our new exception is ever seen by users; the original exception is lost forever, unless the user decides to dig around our library and log it. We need a way to have an exception carry a "cause" along with it.

Java has getCause/setCause and standard constructors that take a cause exception. Printing out an exception's backtrace then reports both that exception and any "cause" exception.

Rubinius has added a similar feature: https://gist.github.com/dbussink/b2e01e51d0c50b27004f

The changes required for this feature are pretty benign:

* Exception#cause and #cause= accessors.
* A new set of Kernel#raise overloads that accept (as a trailing argument, probably) the "cause" exception.
* Modifications to backtrace-printing logic to also display backtrace information from the "cause" exception (and in turn, from any nested "cause" exceptions).

There's some discussion here about alternatives to #cause, none of which are quite as elegant as having it built in: http://www.skorks.com/2013/04/ruby-why-u-no-have-nested-exceptions/


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