Simple Chat Room in NodeJS, expressJS and mongoDB in Docker Swarm
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4 years ago
'use strict';
const middlewareFunctions = require('../query/applyQueryMiddleware').middlewareFunctions;
const promiseOrCallback = require('../promiseOrCallback');
module.exports = function applyStaticHooks(model, hooks, statics) {
const kareemOptions = {
useErrorHandlers: true,
numCallbackParams: 1
};
hooks = hooks.filter(hook => {
// If the custom static overwrites an existing query middleware, don't apply
// middleware to it by default. This avoids a potential backwards breaking
// change with plugins like `mongoose-delete` that use statics to overwrite
// built-in Mongoose functions.
if (middlewareFunctions.indexOf(hook.name) !== -1) {
return !!hook.model;
}
return hook.model !== false;
});
model.$__insertMany = hooks.createWrapper('insertMany',
model.$__insertMany, model, kareemOptions);
for (const key of Object.keys(statics)) {
if (hooks.hasHooks(key)) {
const original = model[key];
model[key] = function() {
const numArgs = arguments.length;
const lastArg = numArgs > 0 ? arguments[numArgs - 1] : null;
const cb = typeof lastArg === 'function' ? lastArg : null;
const args = Array.prototype.slice.
call(arguments, 0, cb == null ? numArgs : numArgs - 1);
// Special case: can't use `Kareem#wrap()` because it doesn't currently
// support wrapped functions that return a promise.
return promiseOrCallback(cb, callback => {
hooks.execPre(key, model, args, function(err) {
if (err != null) {
return callback(err);
}
let postCalled = 0;
const ret = original.apply(model, args.concat(post));
if (ret != null && typeof ret.then === 'function') {
ret.then(res => post(null, res), err => post(err));
}
function post(error, res) {
if (postCalled++ > 0) {
return;
}
if (error != null) {
return callback(error);
}
hooks.execPost(key, model, [res], function(error) {
if (error != null) {
return callback(error);
}
callback(null, res);
});
}
});
}, model.events);
};
}
}
};