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50 lines
1.7 KiB
50 lines
1.7 KiB
/**
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* Various utilities and constants for communicating with the python sandbox.
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*/
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import * as MemBuffer from 'app/common/MemBuffer';
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import log from 'app/server/lib/log';
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/**
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* SandboxError is an error type for reporting errors forwarded from the sandbox.
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*/
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export class SandboxError extends Error {
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constructor(message: string) {
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super("[Sandbox] " + (message || 'Python reported an error'));
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}
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}
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/**
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* Special msgCode values that precede msgBody to indicate what kind of message it is.
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* These all cost one byte. If we needed more, we should probably switch to a number (5 bytes)
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* CALL = call to the other side. The data must be an array of [func_name, arguments...]
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* DATA = data must be a value to return to a call from the other side
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* EXC = data must be an exception to return to a call from the other side
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*/
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export const CALL = null;
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export const DATA = true;
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export const EXC = false;
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/**
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* Returns a function that takes data buffers and logs them to log.info() with the given prefix.
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* The logged output is line-oriented, so that the prefix is only inserted at the start of a line.
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* Binary data is encoded as with JSON.stringify.
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*/
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export function makeLinePrefixer(prefix: string, logMeta: object) {
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let partial = '';
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return (data: Uint8Array) => {
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partial += MemBuffer.arrayToString(data);
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let newline;
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while ((newline = partial.indexOf("\n")) !== -1) {
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const line = partial.slice(0, newline);
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partial = partial.slice(newline + 1);
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// Escape some parts of the string by serializing it to JSON (without the quotes).
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log.origLog('info', "%s%s", prefix,
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JSON.stringify(line).slice(1, -1).replace(/\\"/g, '"').replace(/\\\\/g, '\\'),
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logMeta);
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}
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};
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}
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