The code we write in this chapter has real external dependencies that we need to get set up before we can start to build our system.
Tip
Be sure to check out the chapter notes at https://github.com/matryer/goblueprints if you get stuck on installing any of the dependencies.
In most cases, services such as mongod and nsqd will have to be started before we can run our programs. Since we are writing components of a distributed system, we will have to run each program at the same time, which is as simple as opening many terminal windows.
NSQ is a messaging queue that allows one program to send messages or events to another, or to many other programs running either locally on the same machine, or on different nodes connected by a network. NSQ guarantees the delivery of messages, which means it keeps undelivered messages cached until all interested parties have received them. This means that, even if we stop our counter program, we won't miss any votes. You can contrast...