create-backan
Version:
Quickly create a backan application to get started
94 lines (70 loc) • 1.75 kB
JavaScript
/**
* Backan Route: [stream-example].
*
* @see https://backan.pigeonposse.com/guide/core/route/stream
*/
import { Route } from 'backan'
import { stream } from 'backan/utils'
import { getRandomFact } from './_utils'
const id = 'stream-example'
const route = new Route( {
path : id,
} )
route.add(
{
method : 'post',
path : '/',
summary : 'Stream random facts from [uselessfacts] api',
request : {
body : {
content : {
'application/json' : {
schema : route.validation.object( {
lang : route.validation.union([
route.validation.literal( 'en' ),
route.validation.literal( 'de' ),
])
.optional()
.default( 'en' )
.describe( 'Select language: en | de' ),
} ),
},
},
},
},
responses : {
200 : route.response.responseStreamSuccess( route.validation.string() ),
400 : route.response.responseJSONError400,
500 : route.response.responseJSONError500,
},
tags : [
id,
],
},
async c => {
try {
const { lang } = c.req.valid( 'json' )
const fact = await getRandomFact( lang )
return await stream( c, async stream => {
const write = async ( data, success = true ) =>{
await stream.writeln( JSON.stringify( {
success,
data,
} ) )
}
stream.onAbort( async () => await write( 'aborted', false ) )
const words = fact.split( ' ' )
for ( const word of words ) {
await write( word )
}
await stream.close()
},
async ( e, stream ) => {
await stream.writeln( JSON.stringify( route.response.add400ErrorObject( e ) ) )
} )
} catch ( e ) {
return route.response.add500Error( c, e )
}
},
)
export default route