38 lines
1.1 KiB
TypeScript
Executable file
38 lines
1.1 KiB
TypeScript
Executable file
#!/bin/env -S deno run --allow-read --allow-net
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async function main() {
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const [program_path] = Deno.args;
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if (program_path === undefined) fail_with("Usage: host.ts <program_path>");
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const port = 1728;
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const server = Deno.listen({ port });
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console.log("listening on port", port);
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for await (const connection of server) handle(connection, program_path);
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}
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async function handle(connection: Deno.TcpConn, program_path: string) {
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console.log("serving");
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const file = await try_else(
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() => Deno.open(program_path, { read: true }),
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() => fail_with("Program at", program_path, "does not exists"),
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);
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await try_(() => file.readable.pipeTo(connection.writable));
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}
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function fail_with(...message: string[]) {
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console.error(...message);
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return Deno.exit(1);
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}
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async function try_else<T>(operation: () => T | Promise<T>, on_error: (error: unknown) => T | Promise<T>) {
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try {
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return await operation();
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} catch (error) {
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return await on_error(error);
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}
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}
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async function try_<T>(operation: () => T | Promise<T>) {
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return await try_else(operation, () => null);
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}
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if (import.meta.main) await main();
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