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September 4, 2019 00:19
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Passing around stuff: what's nicest?
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import http from 'http' | |
import { print } from 'util' | |
type Logger = (...args: Parameters<typeof print>) => void | |
const logMe = (logger: Logger) => { | |
const getMaybeSomeData = () => { | |
logger('get maybe some data') | |
return Math.random() > .5 ? 'something' : undefined | |
} | |
const getMoreData = (id: string) => { | |
logger('get more data') | |
return { | |
id, | |
maybe: getMaybeSomeData() | |
} | |
} | |
const getData = (req: http.IncomingMessage) => { | |
logger('get data') | |
return { | |
data: getMoreData('101') | |
} | |
} | |
return { getData } | |
} | |
const server = http | |
.createServer((req, res) => { | |
const requestId = Date.now() | |
const logger: Logger = (fmt: string, ...args: any[]) => { | |
print(`[%s] ${fmt}`, requestId, ...args) | |
} | |
try { | |
res.writeHead(200, { 'Content-Type': 'application/json' }) | |
res.end(logMe(logger).getData(req)) | |
} catch (error) { | |
console.error(error); | |
res.writeHead(500, { 'Content-Type': 'application/json' }) | |
res.write({ message: error.message }) | |
} | |
}) | |
.listen(3000 || process.env.PORT, (err: any) => { | |
if (err) { | |
console.error(err) | |
process.exit(1) | |
} | |
console.log('Listening at:', server.address()) | |
}) |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import http from 'http' | |
import { print } from 'util' | |
type Logger = (...args: Parameters<typeof print>) => void | |
const getMaybeSomeData = (logger: Logger) => { | |
logger('get maybe some data') | |
return Math.random() > .5 ? 'something' : undefined | |
} | |
const getMoreData = (id: string, logger: Logger) => { | |
logger('get more data') | |
return { | |
id, | |
maybe: getMaybeSomeData(logger) | |
} | |
} | |
const getData = (req: http.IncomingMessage, logger: Logger) => { | |
logger('get data') | |
return { | |
data: getMoreData('101', logger) | |
} | |
} | |
const server = http | |
.createServer((req, res) => { | |
const requestId = Date.now() | |
const logger: Logger = (fmt: string, ...args: any[]) => { | |
print(`[%s] ${fmt}`, requestId, ...args) | |
} | |
try { | |
res.writeHead(200, { 'Content-Type': 'application/json' }) | |
res.end(getData(req, logger)) | |
} catch (error) { | |
console.error(error); | |
res.writeHead(500, { 'Content-Type': 'application/json' }) | |
res.write({ message: error.message }) | |
} | |
}) | |
.listen(3000 || process.env.PORT, (err: any) => { | |
if (err) { | |
console.error(err) | |
process.exit(1) | |
} | |
console.log('Listening at:', server.address()) | |
}) |
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