Issue #12101 has been reported by Michael Yagudaev.
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Bug #12101: Add verbose failure messages and avoid infamous DRb::DRbConnError
https://bugs.ruby-lang.org/issues/12101
* Author: Michael Yagudaev
* Status: Open
* Priority: Normal
* Assignee:
* ruby -v:
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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Avoid the generic "DRb::DRbConnError" which gives very little information and make errors hard to debug.
When I stared using DRuby, I kept getting a strange and cryptic error message `DRb::DRbConnError 'connection closed'`. Turns out it was due to some silly mistake on the server side of the relationship. It took hours to figure out. The only way I was able to do it was to patch ruby drb after closely studying the source.
Others have had the same issues:
http://stackoverflow.com/questions/27293817/ruby-connection-closed-drbdrbconnerror
https://www.ruby-forum.com/topic/193984
https://github.com/Mon-Ouie/pry-remote/issues/8
Here is an example where this makes a difference:
```ruby
# drb_server.rb
require 'drb'
class FrontObject
def foo
# generates Runtime Exception of Insecure Operation
result = `ls -l`
end
end
DRb.start_service("druby://localhost:8787", FrontObject.new, safe_level: 3)
DRb.thread.join
```
``` ruby
# drb_client.rb
require 'drb'
object = DRbObject.new_with_uri("druby://localhost:8787")
puts object.foo
```
Output before patch is applied:
```
$ ruby drb_server.rb
```
```
$ ruby drb_client.rb
/Users/mike/.rbenv/versions/2.2.3/lib/ruby/2.2.0/drb/drb.rb:578:in `load': connection closed (DRb::DRbConnError)
```
Output after patch is applied:
```
$ ruby drb_server.rb
Insecure operation ``' at level 3
```
```
$ ruby drb_client.rb
/Users/mike/.rbenv/versions/2.2.3/lib/ruby/2.2.0/drb/drb.rb:578:in `load': connection closed (DRb::DRbConnError)
```
Original issue and proposed solution started on github: https://github.com/ruby/ruby/pull/1260
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