Learning Functional Programming in Go

Attempting to charge before authentication

No surprise here either. If we attempt to charge the credit card before we authenticate the request, the charge will not be processed:

func main() {
       pipeline := BuildPipeline(Decrypt{}, Charge{}, Authenticate{})

The following is the output:

2017/03/08 05:10:32 Close Pipeline
2017/03/08 05:10:32 Error: Error: Unable to charge order Id: 10001
2017/03/08 05:10:32 Error: Error: Unable to charge order Id: 10002
order: &{10001 false false alice,secret 7b/HWvtIB9a16AYk+Yv6WWwer3GFbxpjoR+GO9iHIYY= 0922 [{Apples 1 4.50} {Oranges 4 12.00}]}
order: &{10002 false false bob,secret EOc3kF/OmxY+dRCaYRrey8h24QoGzVU0/T2QKVCHb1Q= 0123 [{Milk 2 8.00} {Sugar 1 2.25} {Salt 3 3.75}]}