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import { Context } from './context.model'
import { SubscriptionRequest } from '../../lib/subscription-req.model'
import { WriteRequest } from '../../lib/write-req.model'
import { DatabaseChange } from '../../lib/database-change.model'
import { decodePath } from '../../lib/path'
import { DatabaseInterface } from 'naive-core'
import express, { RequestHandler } from 'express'
import bodyParser from 'body-parser'
export const bindOperations = (
ctx: Context,
db: DatabaseInterface,
send: (e: DatabaseChange) => Promise<any>
) => {
// these methods should be tracked using a better
// data structure
const unsubs: { [key: string]: () => any } = {}
const writeHandler: RequestHandler = async (req, res) => {
const { path, toWrite } = req.body as WriteRequest
await db.write(path, toWrite)
res.status(200).end()
}
const readHandler: RequestHandler = async (req, res) => {
const { path: encodedPath } = req.params as WriteRequest
const path = decodePath(encodedPath)
try {
const payload = await db.read(path)
res.json(payload)
} catch (err) {
res.status(500).end()
}
}
const addSubHandler: RequestHandler = async (req, res) => {
const { path } = req.body as SubscriptionRequest
// only allow users to subscribe
// to a given path once
// TODO return a better error
if (unsubs[path]) {
res.status(500).end()
return
}
unsubs[path] = db.subscribe(path, async (change: Object) => {
await send({
path,
change
})
})
res.status(200).end()
}
const removeSubHandler: RequestHandler = async (req, res) => {
const { path } = req.body as SubscriptionRequest
const unsub = unsubs[path]
if (unsub) unsub()
}
const router = express()
router.use(bodyParser.json())
router.get('/read/:path', readHandler)
router.post('/write', writeHandler)
router
.route('/subscribe')
.post(addSubHandler)
.delete(removeSubHandler)
const instance = router.listen(ctx.httpPort, () =>
ctx.logger('HTTPS server started')
)
return () =>
new Promise((resolve, reject) => {
instance.close(resolve)
})
}
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