all files / modules/middleware/ catch.js

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
 
 
 
 
 
 
 
 
 
 
 
1×
1×
2×
2×
2×
1×
 
 
1×
 
 
 
 
1×
 
/**
 * A middleware that "catches" non-Errors that are thrown from the downstream
 * app and returns them instead. This can be useful for breaking out of a
 * nested promise chain, for example.
 *
 * Example:
 *
 *   mach.catch(function (conn) {
 *     throw 200;
 *   });
 */
const {is} = require("ramda");
function catchError(app) {
    return function (conn) {
        return conn.call(app).then(undefined, function (reason) {
            if (is(Error, reason)) {
                throw reason;
            }
 
            return reason;
        });
    };
}
 
module.exports = catchError;