Bytegolf Compiler

The Bytegolf Compiler is a sandbox container orchestration tool for running code remotely over HTTP. Each code submission is run in a fresh container that is destroyed after the code finishes executing.

Usage

The compiler is made to run server side and expose an HTTP API. Based on configration seen in the next section the compiler will start X number of workers that run code submissions in a fresh container, returning the code output to the user.

Prerequisites

• Docker - installation instructions

Compiler Configuration and Startup

All Docker images are required on the host machine before code can be remotely executed using the targeted image. The compiler will not pull images from Docker Hub.

Once either the timeout or max output length is hit, the worker container will kill the container and start any backlogged requests if present.

bg-compiler start [flags]

Start a compiler webserver that takes HTTP requests and 
runs them in a docker container.

Usage:
   start [flags]

Flag	Default	Description
--backlog	2000	Job backlog before API rejects requests.
--memory	512	Amount of memory that a container can use for a single run (in MB).
--cpu	1024	CPU shares for a container.
--output	30	Number of bytes that can be read from a container output before the container is killed (in KB).
--timeout	30	Container timeout in seconds.
--workers	4	Number of concurrent workers.
--port	8080	Port to run the compiler on.
--use-gvisor	false	Use gVisor for increased container security (requires runsc).

HTTP Calls

Once the server is started and ready to accept HTTP requests, the following endpoints are available:

Compile Request

Request

POST /compile HTTP/1.1 Content-Type: application/json

curl --request POST \
  --url {{address}}/compile \
  --header 'Content-Type: application/json' \
  --data '{
	"script": "print('\''hello, world!'\'')",
	"image": "python:3.11.1-alpine3.17",
	"count": 1,
	"cmd": "python3"
}'

Field	Type	Description
script	string	The code to be executed.
image	string	The Docker image to run the code in. Image must be available on host.
count	int	The number of times to run the code.
cmd	string	The command to run the code with. Ex: python3, go run
extension	string	The file extension of the code. Ex: py, go

Response

[
	{
		"stdout": "hello, world!\n",
		"stderr": "",
		"duration_ms": 48,
		"timed_out": false
	}
]

Field	Type	Description
stdout	string	Sandbox stdout.
stderr	string	Sandbox stderr.
duration_ms	int	Execution time in milliseconds.
timed_out	bool	Whether the container timed out or not.

Hello, World!

This section walks through setting up the webserver with a couple of workers and running a simple "Hello, world!" program in Bun.

Step 1: Pull Docker Image

Pull the Docker image that will be used to run the code. In this example we will use the oven/bun:1.0 image to run Javascript using Bun.

docker pull oven/bun:1.0

Step 2: Start the Compiler

Start the compiler with 2 workers and a 30 second timeout. Each of the workers will run in a container with 512MB of memory and a 1KB output limit on port 8000.

bg-compiler start \
  --workers 2 \
  --timeout 30 \
  --memory 512 \
  --output 1 \
  --port 8000

Step 3: Send a Compile Request

Send a compile request to the server. The request will run the code in the oven/bun:1.0 image and print Hello, world! to stdout.

Using a JSON escape tool, transform the following code from

console.log("Hello, world!");

to

console.log(\"Hello, world!\");

Using cURL, send a compile count of 10 to the server:

curl --request POST \
  --url http://localhost:8000/compile \
  --header 'Content-Type: application/json' \
  --data '{
	"script": "console.log(\"Hello, world!\");",
	"image": "oven/bun:1.0",
	"count": 4,
	"cmd": "bun",
  "extension": "js"
}'

Output:

[
	{
		"stdout": "hello, world!\n",
		"stderr": "",
		"duration_ms": 34,
		"timed_out": false
	},
	{
		"stdout": "hello, world!\n",
		"stderr": "",
		"duration_ms": 39,
		"timed_out": false
	},
	{
		"stdout": "hello, world!\n",
		"stderr": "",
		"duration_ms": 45,
		"timed_out": false
	},
	{
		"stdout": "hello, world!\n",
		"stderr": "",
		"duration_ms": 43,
		"timed_out": false
	}
]