offshore
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An ORM for Node.js
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<a href="../../../index.html">all files</a> / <a href="index.html">lib/offshore/error/</a> index.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* Module dependencies
*/
var util = require('util');
var _ = require('lodash');
var WLError = require('./WLError');
var WLValidationError = require('./WLValidationError');
/**
* A classifier which normalizes a mystery error into a simple,
* consistent format. This ensures that our instance which is
* "new"-ed up belongs to one of a handful of distinct categories
* and has a predictable method signature and properties.
*
* The returned error instance will always be or extend from
* `WLError` (which extends from `Error`)
*
* NOTE:
* This method should eventually be deprecated in a
* future version of Offshore. It exists to help
* w/ error type negotiation. In general, Offshore
* should use WLError, or errors which extend from it
* to construct error objects of the appropriate type.
* In other words, no ** new ** errors should need to
* be wrapped in a call to `errorify` - instead, code
* necessary to handle any new error conditions should
* construct a `WLError` directly and return that.
*
* @param {???} err
* @return {WLError}
*/
module.exports = function errorify(err) {
// If specified `err` is already a WLError, just return it.
if (typeof err === 'object' && err instanceof WLError) return err;
return duckType(err);
};
/**
* Determine which type of error we're working with.
* Err... using hacks.
*
* @return {[type]} [description]
*/
function duckType(err) {
// Validation or constraint violation error (`E_VALIDATION`)
//
// i.e. detected before talking to adapter, like `minLength`
// i.e. constraint violation reported by adapter, like `unique`
if (/* _isValidationError(err) || */ _isConstraintViolation(err)) {
// Dress `unique` rule violations to be consistent with other
// validation errors.
return new WLValidationError(err);
}
// Unexpected miscellaneous error (`E_UNKNOWN`)
//
// (i.e. helmet fire. The database crashed or something. Or there's an adapter
// bug. Or a bug in WL core.)
return new WLError({
originalError: err
});
}
/**
* @param {?} err
* @return {Boolean} whether this is an adapter-level constraint
* violation (e.g. `unique`)
*/
function _isConstraintViolation(err) {
// If a proper error code is specified, this error can be classified.
if (err && typeof err === 'object' && err.code === 'E_UNIQUE') {
return true;
}
// Otherwise, there is not enough information to call this a
// constraint violation error and provide proper explanation to
// the architect.
else return false;
}
// /**
// * @param {?} err
// * @return {Boolean} whether this is a validation error (e.g. minLength exceeded for attribute)
// */
// function _isValidationError(err) {
// return _.isObject(err) && err.ValidationError;
// }
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