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59 lines
2.0 KiB
JavaScript
59 lines
2.0 KiB
JavaScript
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/**
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* Various utilities and constants for communicating with the python sandbox.
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*/
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var MemBuffer = require('app/common/MemBuffer');
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var log = require('./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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function SandboxError(message) {
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// Poorly documented node feature, required to make the derived error keep a proper stack trace.
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Error.captureStackTrace(this, this.constructor);
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this.name = 'SandboxError';
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this.message = "[Sandbox] " + (message || 'Python reported an error');
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}
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SandboxError.prototype = new Error();
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// We need to set the .constructor property for Error.captureStackTrace to work correctly.
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SandboxError.prototype.constructor = SandboxError;
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exports.SandboxError = SandboxError;
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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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exports.CALL = null;
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exports.DATA = true;
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exports.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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function makeLinePrefixer(prefix, logMeta) {
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var partial = '';
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return data => {
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partial += MemBuffer.arrayToString(data);
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var newline;
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while ((newline = partial.indexOf("\n")) !== -1) {
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var 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.rawInfo(prefix + JSON.stringify(line).slice(1, -1).replace(/\\"/g, '"')
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.replace(/\\\\/g, '\\'),
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logMeta);
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}
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};
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}
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exports.makeLinePrefixer = makeLinePrefixer;
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