rescue from connection reset by peer error and retry - ruby-on-rails

Question

I am hitting an external service which does some password encryption and returns couple of things.
Now if I want to generate 50 passwords we run this function in a loop 50 times
def self.encrypt_password(password)
retries = 2
uri = URI
params = Base64.encode64(password)
uri.query = URI.encode("Source=#{params}")
begin
retries.times.each do
res = Net::HTTP.get_response(uri)
if res.is_a?(Net::HTTPSuccess)
obj = JSON.parse(res.body)
pw = Base64.decode64(obj["Data"])
ps = Base64.decode64(obj["Key"])
pws = Iconv.iconv('ascii', 'utf-16', pws)
return pwe,pws[0]
end
end
rescue
raise "Error generating pws: #{$!}"
end
end
But the problem, i am encountering is that there are occasions when the service just returns the following error in the middle of a loop and exits:
"Connection reset by Peer error"
My question is how do I rescue from that error and retry a few times without breaking the flow of the program?
Or can someone recommend alternate solutions to my problem?
NOTE: I am using ruby on rails 2 and ruby 1.8.x

Answer 1

Ruby has the retry method, that can be used in the rescue clause.
It just runs the current method again, so you can use a counter to limit the number of retries:
def self.encrypt_password(password)
retries = 2
uri = URI
params = Base64.encode64(password)
uri.query = URI.encode("Source=#{params}")
retries.times.each do
res = Net::HTTP.get_response(uri)
if res.is_a?(Net::HTTPSuccess)
obj = JSON.parse(res.body)
pw = Base64.decode64(obj["Data"])
ps = Base64.decode64(obj["Key"])
pws = Iconv.iconv('ascii', 'utf-16', pws)
return pwe,pws[0]
end
end
rescue SomeExceptionType
if retries > 0
retries -= 1
retry
else
raise "Error generating pws: #{$!}"
end
end
end