xen-api/transports/json-rpc.mjs

Connector to the Xen API

import { format, parse } from 'json-rpc-protocol'
import { request } from 'undici'

import XapiError from '../_XapiError.mjs'

import UnsupportedTransport from './_UnsupportedTransport.mjs'

// https://github.com/xenserver/xenadmin/blob/0df39a9d83cd82713f32d24704852a0fd57b8a64/XenModel/XenAPI/Session.cs#L403-L433
export default ({ dispatcher, url }) => {
  url = new URL('./jsonrpc', Object.assign(new URL('http://localhost'), url))

  return async function (method, args) {
    const res = await request(url, {
      dispatcher,
      body: format.request(0, method, args),
      headers: {
        Accept: 'application/json',
        'Content-Type': 'application/json',
      },
      method: 'POST',
    })

    if (((res.statusCode / 100) | 0) !== 2) {
      throw new Error('unexpect statusCode ' + res.statusCode)
    }

    // content-type is `text/xml` on old hosts where JSON-RPC is unsupported
    if (res.headers['content-type'] !== 'application/json') {
      throw new UnsupportedTransport()
    }

    const response = parse(await res.body.text())

    if (response.type === 'response') {
      return response.result
    }

    throw XapiError.wrap(response.error)
  }
}