forked from vercel/micro-dev
/
log.js
133 lines (106 loc) · 2.9 KB
/
log.js
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// Packages
const chalk = require('chalk');
const jsome = require('jsome');
const PrettyError = require('pretty-error');
const stringLength = require('string-length');
const {json, send} = require('micro');
const pe = new PrettyError();
jsome.colors = {
'num': 'cyan',
'str': 'green',
'bool': 'red',
'regex': 'blue',
'undef': 'grey',
'null': 'grey',
'attr': 'reset',
'quot': 'reset',
'punc': 'reset',
'brack': 'reset'
};
const logLine = (message, date) => {
const dateString = `${chalk.grey(date.toLocaleTimeString())}`;
let logSpace =
process.stdout.columns - stringLength(message) - stringLength(dateString);
if (logSpace <= 0) {
logSpace = 10;
}
console.log(`${message}${' '.repeat(logSpace)}${dateString}\n`);
};
const logRequest = async ({req, start, requestIndex, limit}) => {
logLine(`> #${requestIndex} ${chalk.bold(req.method)} ${req.url}`, start);
if (req.headers['content-length'] > 0 && req.headers['content-type'].indexOf('application/json') === 0) {
try {
const parsedJson = await json(req, {limit});
jsome(parsedJson);
console.log('');
} catch (err) {
console.log(`JSON body could not be parsed: ${err.message} \n`);
}
}
};
const logStatusCode = statusCode => {
if (statusCode >= 500) {
return chalk.red(statusCode);
}
if (statusCode >= 400 && statusCode < 500) {
return chalk.yellow(statusCode);
}
if (statusCode >= 300 && statusCode < 400) {
return chalk.blue(statusCode);
}
if (statusCode >= 200 && statusCode < 300) {
return chalk.green(statusCode);
}
return statusCode;
};
const logResponse = async ({res, end, endTime, requestIndex, chunk}) => {
const statusCode = logStatusCode(res.statusCode);
logLine(`< #${requestIndex} ${statusCode} [+${end}]`, endTime);
if (res.microErr) {
console.log(pe.render(res.microErr));
return;
}
try {
const str = JSON.parse(chunk);
jsome(str);
} catch (err) {
if (typeof chunk === 'string') {
console.log(`${chunk.substr(0, 100)}${chunk.length > 100 ? '...' : ''}`);
}
}
};
let requestCounter = 0;
const initLog = (req, res, limit) => {
const start = new Date();
const requestIndex = ++requestCounter;
console.log(chalk.grey(`\n${'—'.repeat(process.stdout.columns)}\n`));
const reqBodyReady = logRequest({req, start, requestIndex, limit});
const end = res.end;
res.end = (chunk, encoding, callback) => {
res.end = end;
const endTime = new Date();
const delta = endTime - start;
const requestTime =
delta < 10000 ? `${delta}ms` : `${Math.round(delta / 1000)}s`;
reqBodyReady.then(() =>
logResponse({
res,
start,
end: requestTime,
endTime,
requestIndex,
chunk
}));
return res.end(chunk, encoding, callback);
};
};
module.exports = (fn, limit) => async (req, res) => {
initLog(req, res, limit);
try {
return await fn(req, res);
} catch (err) {
res.microErr = err;
const {statusCode = 500, stack} = err;
return send(res, statusCode, stack);
}
};