Genstrument

Generate code to instrument an interface.

Supported Interfaces

Binary

An interface with methods that return an error as the last return value. Depending if the error is nil, the corresponding counter vector will be increased.

Handler

An interface with methods that have no return values, the first argument is an http.ResponseWriter and the second argument is an *http.Request.

Install

Install with

go install github.com/leonnicolas/genstrument@latest

or add github.com/leonnicolas/genstrument to your tools.go file.

Usage

Run

genstrument --file-path <file-path-to-interface> -p <interface-name> --metric-help <help text> --metric-name <metric-name> -o -

to print the generated code to stdout.

Or add something like

//go:generate go run github.com/leonnicolas/genstrument --file-path <file-name> -p <interface-name> --metric-help <help text> --metric-name <metric-name> -o gen.go

into the go file, that contains the interface you want to instrument.