Handling connection failures with capistrano
Posted by Rob, Mon May 28 10:03:00 UTC 2007
We’ve had some problems with handling connection failures/timeouts with capistrano, because it currently (1.99.1) causes capistrano to exit from an exception trigged by Net::SSH. We wanted to handle this just like a command failure. I’ve not had time to form a proper patch for capistrano to submit upstream for this because of an impending deadline, but we’ve put a monkey patch in place (re-opening classes in ruby is just, well, awesome). I will of course write a proper patch for this once I’ve time, including being more specific about the Exceptions we wish to catch :)
You can use this to have capistrano treat a connection failure as a command failure:
module Capistrano
class Configuration
module Connections
# Hack, we return a fake connection which always reports closed.
class FakeConnection
def initialize(server)
@server = server
end
def open_channel(&block)
logger.important "could not open channel", @server if logger
{ :closed => true, :server => @server }
end
end
class DefaultConnectionFactory
def wrapped_connect_to(server)
begin
connection = capistrano_connect_to(server)
rescue Exception
FakeConnection.new(server)
end
end
alias capistrano_connect_to connect_to
alias connect_to wrapped_connect_to
end
end
end