14. CLI & Libraries
Pick pragmatic libraries and structure CLIs for operability, testability, and cancellation.
Question: Which libraries are sensible picks at middle level and why?
Answer:
- CLI:
cobra/pflag; - HTTP router:
chi; - logging: stdlib
slogorzapfor performance; - metrics:
prometheus/client_golang; - tracing:
otel; - config: stdlib + optional
viper/envconfig; - migrations:
golang-migrate; testing: stdlib +testify.
Explanation: These are widely adopted, well‑maintained, and easy to justify in interviews.
Question: How do you structure a
cobraCLI and handle cancellation?
Answer: Define a root command with persistent flags and subcommands. In RunE, accept a Context (cmd.Context()) and respect cancellation.
Explanation: Wire signal handling (signal.NotifyContext) at main and pass the context to command execution and downstream operations.