let querystring = require('querystring')
let stream_buffers = require('stream-buffers')
return async env => {
if (env.request.method == 'POST') {
let write_stream = new stream_buffers.WritableStreamBuffer()
let data = new Promise(
(resolve, reject) => {
write_stream.
on('finish', () => {resolve(write_stream.getContents())}).
on('error', () => {reject()})
}
)
env.request.pipe(write_stream)
let query = querystring.parse((await data).toString())
let a_length = parseFloat(query.a_length)
let b_length = parseFloat(query.b_length)
let height = parseFloat(query.height)
let area = (a_length + b_length) / 2 * height
let _out = []
_out.push(
`
Calculation
The Height is: ${height} units
The A length is: ${a_length} units
The B length is: ${b_length} units
The area is: ${area} units2
`
)
env.site.serve(
env,
200,
Buffer.from(_out.join('')),
'calculate_button_trapezium.html.jst'
)
}
else {
let _out = []
_out.push(
`
Calculation
Error - Unable to Calculate
`
)
env.site.serve(
env,
200,
Buffer.from(_out.join('')),
'calculatebutton.html.jst'
)
}
}