40 lines
838 B
JavaScript
40 lines
838 B
JavaScript
'use strict'
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const stations = require('db-stations')
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const err400 = (msg) => {
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const err = new Error(msg)
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err.statusCode = 400
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return err
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}
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// This is terribly inefficient, because we read all stations for every request.
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// todo: optimize it
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const route = (req, res, next) => {
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const id = req.params.id.trim()
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const stream = stations.full()
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let found = false
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const onStation = (station) => {
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if (station.id !== id) return
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found = true
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stream.removeListener('data', onStation)
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res.json(station)
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next('/station/:id')
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}
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stream.on('data', onStation)
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const onEnd = () => {
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if (!found) return next(err400('Station not found.'))
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}
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stream.once('end', onEnd)
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stream.once('error', (err) => {
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stream.removeListener('data', onStation)
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stream.removeListener('end', onEnd)
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next(nerr)
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})
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}
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module.exports = route
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