Simple Chat Room in NodeJS, expressJS and mongoDB in Docker Swarm
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4 years ago
'use strict';
const symbols = require('../../schema/symbols');
const promiseOrCallback = require('../promiseOrCallback');
/*!
* ignore
*/
module.exports = applyHooks;
/*!
* ignore
*/
applyHooks.middlewareFunctions = [
'deleteOne',
'save',
'validate',
'remove',
'updateOne',
'init'
];
/*!
* Register hooks for this model
*
* @param {Model} model
* @param {Schema} schema
*/
function applyHooks(model, schema, options) {
options = options || {};
const kareemOptions = {
useErrorHandlers: true,
numCallbackParams: 1,
nullResultByDefault: true,
contextParameter: true
};
const objToDecorate = options.decorateDoc ? model : model.prototype;
model.$appliedHooks = true;
for (const key of Object.keys(schema.paths)) {
const type = schema.paths[key];
let childModel = null;
if (type.$isSingleNested) {
childModel = type.caster;
} else if (type.$isMongooseDocumentArray) {
childModel = type.Constructor;
} else {
continue;
}
if (childModel.$appliedHooks) {
continue;
}
applyHooks(childModel, type.schema, options);
if (childModel.discriminators != null) {
const keys = Object.keys(childModel.discriminators);
for (const key of keys) {
applyHooks(childModel.discriminators[key],
childModel.discriminators[key].schema, options);
}
}
}
// Built-in hooks rely on hooking internal functions in order to support
// promises and make it so that `doc.save.toString()` provides meaningful
// information.
const middleware = schema.s.hooks.
filter(hook => {
if (hook.name === 'updateOne' || hook.name === 'deleteOne') {
return !!hook['document'];
}
if (hook.name === 'remove') {
return hook['document'] == null || !!hook['document'];
}
return true;
}).
filter(hook => {
// If user has overwritten the method, don't apply built-in middleware
if (schema.methods[hook.name]) {
return !hook.fn[symbols.builtInMiddleware];
}
return true;
});
model._middleware = middleware;
objToDecorate.$__originalValidate = objToDecorate.$__originalValidate || objToDecorate.$__validate;
for (const method of ['save', 'validate', 'remove', 'deleteOne']) {
const toWrap = method === 'validate' ? '$__originalValidate' : `$__${method}`;
const wrapped = middleware.
createWrapper(method, objToDecorate[toWrap], null, kareemOptions);
objToDecorate[`$__${method}`] = wrapped;
}
objToDecorate.$__init = middleware.
createWrapperSync('init', objToDecorate.$__init, null, kareemOptions);
// Support hooks for custom methods
const customMethods = Object.keys(schema.methods);
const customMethodOptions = Object.assign({}, kareemOptions, {
// Only use `checkForPromise` for custom methods, because mongoose
// query thunks are not as consistent as I would like about returning
// a nullish value rather than the query. If a query thunk returns
// a query, `checkForPromise` causes infinite recursion
checkForPromise: true
});
for (const method of customMethods) {
if (!middleware.hasHooks(method)) {
// Don't wrap if there are no hooks for the custom method to avoid
// surprises. Also, `createWrapper()` enforces consistent async,
// so wrapping a sync method would break it.
continue;
}
const originalMethod = objToDecorate[method];
objToDecorate[method] = function() {
const args = Array.prototype.slice.call(arguments);
const cb = args.slice(-1).pop();
const argsWithoutCallback = typeof cb === 'function' ?
args.slice(0, args.length - 1) : args;
return promiseOrCallback(cb, callback => {
return this[`$__${method}`].apply(this,
argsWithoutCallback.concat([callback]));
}, model.events);
};
objToDecorate[`$__${method}`] = middleware.
createWrapper(method, originalMethod, null, customMethodOptions);
}
}