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import { App } from "@tinyhttp/app"
import { logger } from "@tinyhttp/logger"
import { json } from "milliparsec"
import { promisify } from "util"
import { exec as cb_exec } from "child_process"
import tmp from "tmp"
import fs from "fs"
import { RunnerApi } from "slam-types"
import { cors } from "@tinyhttp/cors"
const exec = promisify(cb_exec)
const app = new App()
const PORT = process.env.PORT ? Number(process.env.PORT) : 3000
console.log(`Serving API on port ${PORT}`)
const TIMEOUT = process.env.TIMEOUT ? Number(process.env.TIMEOUT) : 5000 // ms
const MAX_SRC_LENGTH = process.env.MAX_SRC_LENGTH ? Number(process.env.MAX_SRC_LENGTH) : 4000 // characters
const interpretFile = async (sourceFile: string) => {
const cmd = `./interpreter ${sourceFile}`
try {
const result = await exec(cmd, { timeout: TIMEOUT, killSignal: "SIGKILL" })
return result.stdout
} catch (err) {
console.error(err)
return err.stdout // the interpreter only outputs to stdout
}
}
app
.use(logger({
timestamp: { format: "YYYY-MM-DDTHH:mm:ssZ" },
}))
.use(cors())
.use(json())
.post(RunnerApi.SubmitRequest.path, async (req, res) => {
const body: RunnerApi.SubmitRequest.Body | undefined = req.body
if (!body || !body.source || body.source.length > MAX_SRC_LENGTH) {
return res.sendStatus(400)
}
const { name: sourceFile } = tmp.fileSync() as { name: string }
fs.writeFileSync(sourceFile, body.source)
const result = await interpretFile(sourceFile)
fs.rmSync(sourceFile)
const response: RunnerApi.SubmitResponse.Body = { result }
res.send(response)
})
.listen(PORT)
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