GoTutor

GoTutor is a project aimed at capturing the execution steps of a Go program by interacting with the Delve debugger server. It retrieves variable values and stack information of all running Goroutines at each Go statement.

https://gotutor.dev/

Features

• Capture running Goroutines and its stack frames state at each Go statement of the main Goroutine.
• Interactive online Debugging tool: https://gotutor.dev/.

Architecture

The project is split into three components:

• CLI tool: that takes a go program and produces output/steps.json file which represent the execution steps of the program (exists under .)
• backend: run the CLI tool for the given program and return the execution steps (exists under backend/)
• frontend: the frontend of https://gotutor.dev/ which is build using elm-lang (exists under frontend/)

Limitations

Currently, the project has limitations when handling multiple goroutines. When using next or step on a single goroutine, all goroutines progress, making it difficult to capture the state of other goroutines. This issue is documented in Delve Issue #1529. Attempts to create a client for each goroutine and step through them individually have been unsuccessful and have caused runtime errors in the Delve server.

Usage

the commands follow dlv cli terminology

exec

gotutor exec binary_path

run delve server with the binary that gotutor will interact with to get execution steps

debug

gotutor debug

build the go module in the current directory then contine the same as exec

connect

gotutor connect delve_server_address

connect to already running delve server

the execution steps will be written to steps.json file in the current direcotry

Prerequisites

• Go (latest version)
• Delve debugger

Installation

go install github.com/ahmedakef/gotutor@latest

docker

docker build -t gotutor . # or directly use ahmedakef/gotutor image to download it from docker hub
docker run --rm -v $(pwd)/example/main.go:/data/main.go -v $(pwd)/output/:/root/output gotutor debug /data/main.go

Contributing

Contributions are welcome! Please open an issue or submit a pull request.

License

This project is licensed under the MIT License.

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