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