Studio Log X

❎ X-out confidential data in log entries of a Studio Log stream.

Usage

const logger = require('@studio/log').out(process.stdout);
const logX = require('@studio/log-x');

const log = logger('app');
log.filter(logX('connection.password'));

log.input('db', { connection: { login: 'admin', password: 'secret' } });

The above produces this log output:

{"ts":1486630378584,"ns":"app","topic":"input","msg":"db","data":{
  "connection":{"login":"admin","password":"·····"}}}

Data objects are copied before modification to make it safe to pass object references as log data.

Install

❯ npm i @studio/log-x

API

• x(path...): Returns a transform stream in object mode that filters the properties at the given paths.
• x(map): Maps topic names to filters. The special * topic is used if no matching topic filter was specified.
• x.ns(ns, path...): Like x(path...), but only for the specified namespace.
• x.ns(ns, map): Like x(map), but only for the specified namespace.
• x.all(transform...): Combine the given x-out transforms.

// x(map)
logX({
  input: ['connection.user', 'connection.password'],
  '*': ['token']
});

// x.ns(ns, path...)
logX.ns('Login', 'request.user', 'request.password');

Supported notations

• key: Property access.
• key.path: Property path access.
• items[0]: Array index access.
• items[':a']: Quoted property access.
• item.*: All values in object.
• items[*]: All entries in array.
• item.*.key: Property access in each value of object.
• items[*].key: Property access in each entry of array.

Related modules

• 👻 Studio Log logs ndjson to an output stream
• 📦 Studio Changes is used to create the changelog for this module.

License

MIT

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