This repo contains hub and client in separate packages. The concept of messaging is based on protobuf format. The client is supplemented with simple cli api. The technical requirements are here
You can build both client and hub with:
make get
make build
Start hub
./bin/hub
Start clients
./bin/client
Type help to get list of available commands
- User authentication. To authenticate users, I've chosen naive approach with simple integer counter, every new user gets an incremented integer as ID
- Messaging fashion. Client is sending requests and receiving responses and relays from server. Whenever client is sending request it blocks on responseChan and waits for asynchronous handler to write response in the responseChan.
- I've chosen protobuf as the most convenient protocol for network communication. Based on benchmarks from https://github.com/alecthomas/go_serialization_benchmarks github.com/gogo/protobuf seems like the most advanced in terms of memory allocations and speed.
- There's request timeout implemented in the code to terminate the unsuccessful requests.
- In the implementation there's no real multiplexing. Blocking on responseChan is somewhat fragile, since we are receiving messages asynchronously and don't know really if the received response is actually for our certain request. Though synchronous request send saves us from this issue. Multiplexing could be solved with streams, e.g. with: https://github.com/hashicorp/yamux
- Both client logging and CLI are using stdout for simplicity.
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