feat(xapi/Record#$xapi): link connection from record

packages/xen-api/src/index.js

@@ -248,6 +248,11 @@ const RESERVED_FIELDS = {
   pool: true,
   ref: true,
   type: true,
+  xapi: true,
+}
+
+function getPool() {
+  return this.$xapi.pool
 }
 
 // -------------------------------------------------------------------
@@ -289,9 +294,6 @@ export class Xapi extends EventEmitter {
       }
     }
 
-    // Memoize this function _addObject().
-    this._getPool = () => this._pool
-
     if (opts.watchEvents !== false) {
       this.watchEvents()
     }
@@ -1055,6 +1057,7 @@ export class Xapi extends EventEmitter {
         defineProperties(this, {
           $id: { value: data.uuid || ref },
           $ref: { value: ref },
+          $xapi: { value: xapi },
         })
         for (let i = 0; i < nFields; ++i) {
           const field = fields[i]
@@ -1062,7 +1065,7 @@ export class Xapi extends EventEmitter {
         }
       }
 
-      const getters = { $pool: this._getPool }
+      const getters = { $pool: getPool }
       const props = { $type: type }
       fields.forEach(field => {
         props[`set_${field}`] = function(value) {