lib/compile/async.js
function compileAsync(schema, meta, callback) {
  /* eslint no-shadow: 0 */
  /* global Promise */
  /* jshint validthis: true */
  var self = this;
  if (typeof this._opts.loadSchema != 'function')
    throw new Error('options.loadSchema should be a function');

  if (typeof meta == 'function') {
    callback = meta;
    meta = undefined;
  }

  var p = loadMetaSchemaOf(schema).then(function () {
    var schemaObj = self._addSchema(schema, undefined, meta);
    return schemaObj.validate || _compileAsync(schemaObj);
  });

  if (callback) {
    p.then(
      function(v) { callback(null, v); },
      callback
    );
  }

  return p;


  function loadMetaSchemaOf(sch) {
    var $schema = sch.$schema;
    return $schema && !self.getSchema($schema)
            ? compileAsync.call(self, { $ref: $schema }, true)
            : Promise.resolve();
  }


  function _compileAsync(schemaObj) {
    try { return self._compile(schemaObj); }
    catch(e) {
      if (e instanceof MissingRefError) return loadMissingSchema(e);
      throw e;
    }


    function loadMissingSchema(e) {
      var ref = e.missingSchema;
      if (added(ref)) throw new Error('Schema ' + ref + ' is loaded but ' + e.missingRef + ' cannot be resolved');

      var schemaPromise = self._loadingSchemas[ref];
      if (!schemaPromise) {
        schemaPromise = self._loadingSchemas[ref] = self._opts.loadSchema(ref);
        schemaPromise.then(removePromise, removePromise);
      }

      return schemaPromise.then(function (sch) {
        if (!added(ref)) {
          return loadMetaSchemaOf(sch).then(function () {
            if (!added(ref)) self.addSchema(sch, ref, undefined, meta);
          });
        }
      }).then(function() {
        return _compileAsync(schemaObj);
      });

      function removePromise() {
        delete self._loadingSchemas[ref];
      }

      function added(ref) {
        return self._refs[ref] || self._schemas[ref];
      }
    }
  }
}
function compileAsync(schema, meta, callback) {
  /* eslint no-shadow: 0 */
  /* global Promise */
  /* jshint validthis: true */
  var self = this;
  if (typeof this._opts.loadSchema != 'function')
    throw new Error('options.loadSchema should be a function');

  if (typeof meta == 'function') {
    callback = meta;
    meta = undefined;
  }

  var p = loadMetaSchemaOf(schema).then(function () {
    var schemaObj = self._addSchema(schema, undefined, meta);
    return schemaObj.validate || _compileAsync(schemaObj);
  });

  if (callback) {
    p.then(
      function(v) { callback(null, v); },
      callback
    );
  }

  return p;


  function loadMetaSchemaOf(sch) {
    var $schema = sch.$schema;
    return $schema && !self.getSchema($schema)
            ? compileAsync.call(self, { $ref: $schema }, true)
            : Promise.resolve();
  }


  function _compileAsync(schemaObj) {
    try { return self._compile(schemaObj); }
    catch(e) {
      if (e instanceof MissingRefError) return loadMissingSchema(e);
      throw e;
    }


    function loadMissingSchema(e) {
      var ref = e.missingSchema;
      if (added(ref)) throw new Error('Schema ' + ref + ' is loaded but ' + e.missingRef + ' cannot be resolved');

      var schemaPromise = self._loadingSchemas[ref];
      if (!schemaPromise) {
        schemaPromise = self._loadingSchemas[ref] = self._opts.loadSchema(ref);
        schemaPromise.then(removePromise, removePromise);
      }

      return schemaPromise.then(function (sch) {
        if (!added(ref)) {
          return loadMetaSchemaOf(sch).then(function () {
            if (!added(ref)) self.addSchema(sch, ref, undefined, meta);
          });
        }
      }).then(function() {
        return _compileAsync(schemaObj);
      });

      function removePromise() {
        delete self._loadingSchemas[ref];
      }

      function added(ref) {
        return self._refs[ref] || self._schemas[ref];
      }
    }
  }
}
function compileAsync ( schema , meta , callback ) { /* eslint no-shadow: 0 */ /* global Promise */ /* jshint validthis: true */ var self = this ; if ( typeof this . _opts . loadSchema != 'function' ) throw new Error ( 'options.loadSchema should be a function' ) ; if ( typeof meta == 'function' ) { callback = meta ; meta = undefined ; } var p = loadMetaSchemaOf ( schema ) . then ( function ( ) { var schemaObj = self . _addSchema ( schema , undefined , meta ) ; return schemaObj . validate || _compileAsync ( schemaObj ) ; } ) ; if ( callback ) { p . then ( function ( v ) { callback ( null , v ) ; } , callback ) ; } return p ; function loadMetaSchemaOf ( sch ) { var $schema = sch . $schema ; return $schema && ! self . getSchema ( $schema ) ? compileAsync . call ( self , { $ref : $schema } , true ) : Promise . resolve ( ) ; } function _compileAsync ( schemaObj ) { try { return self . _compile ( schemaObj ) ; } catch ( e ) { if ( e instanceof MissingRefError ) return loadMissingSchema ( e ) ; throw e ; } function loadMissingSchema ( e ) { var ref = e . missingSchema ; if ( added ( ref ) ) throw new Error ( 'Schema ' + ref + ' is loaded but ' + e . missingRef + ' cannot be resolved' ) ; var schemaPromise = self . _loadingSchemas [ ref ] ; if ( ! schemaPromise ) { schemaPromise = self . _loadingSchemas [ ref ] = self . _opts . loadSchema ( ref ) ; schemaPromise . then ( removePromise , removePromise ) ; } return schemaPromise . then ( function ( sch ) { if ( ! added ( ref ) ) { return loadMetaSchemaOf ( sch ) . then ( function ( ) { if ( ! added ( ref ) ) self . addSchema ( sch , ref , undefined , meta ) ; } ) ; } } ) . then ( function ( ) { return _compileAsync ( schemaObj ) ; } ) ; function removePromise ( ) { delete self . _loadingSchemas [ ref ] ; } function added ( ref ) { return self . _refs [ ref ] || self . _schemas [ ref ] ; } } } }
Creates validating function for passed schema with asynchronous loading of missing schemas.
`loadSchema` option should be a function that accepts schema uri and returns promise that resolves with the schema.
@this  Ajv
@param {Object}   schema schema object
@param {Boolean}  meta optional true to compile meta-schema; this parameter can be skipped
@param {Function} callback an optional node-style callback, it is called with 2 parameters: error (or null) and validating function.
@return {Promise} promise that resolves with a validating function.
Creates validating function for passed schema with asynchronous loading of missing schemas . loadSchema option should be a function that accepts schema uri and returns promise that resolves with the schema .