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hyperdb-questions

Sample repo connecting the hyperdb to a discovery-swarm for the purpose of asking a few questions.
Derived from @cblgh's super helpful example.

Also, HUGE gratitude and thanks to @mafintosh (and everyone else contributing) for creating these building blocks. What a treasure trove of extraordinary work.

Questions

I have a few orienting questions as I start getting my hands dirty with some code.
I've posted each question as an issue to allow easy comments and discussion there for anyone who can weigh in (thanks!).

Example Code

npm install # yada yada yada

Open 1..n consoles running:

npm start

Each console creates a new hyperdb, using the initial database's dbKey.

The demo simply writes arbitray values to the primary database on a loop (db-1). Subsequence windows (db-2...etc) listen and log the changes.

demo

To delete the databases and start again:

npm run reset

Refs

hyperdb-questions's People

Contributors

philcockfield avatar

Watchers

avatar James Cloos avatar avatar

hyperdb-questions's Issues

Question: Map and Reduce usage in HyperDB options

When are are the map and reduce options that are passed into the hyperdb construcgtor invoked, and how should they be used/implemented by the consuming app?

const hyperdb = require('hyperdb');

/**
 * Construct a new instance of a [hyperdb].
 * See:
 * - https://github.com/mafintosh/hyperdb
 */
function create(args = {}) {
  const reduce = (a, b) => a;
  const map = node => node;
  return new Promise(resolve => {
    const { dir, dbKey } = args;
    const options = { valueEncoding: 'utf-8', reduce, map };
    const db = dbKey ? hyperdb(dir, dbKey, options) : hyperdb(dir, options);
    db.on('ready', () => resolve(db));
  });
}

refs:

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