nostrdb

The unfairly fast nostr database backed by lmdb.

nostrdb stores nostr events as a custom in-memory representation that enables zero-copy and O(1) access to all note fields. This is similar to flatbuffers but it is custom built for nostr events.

These events are then memory-mapped inside lmdb, enabling insanely fast, zero-copy access and querying.

This entire design of nostrdb is copied almost entirely from strfry1, the fastest nostr relay. The difference is that nostrdb is meant to be embeddable as a C library into any application with full nostr query support.

API

The API is very unstable. nostrdb is in heavy development mode so don't expect any of the interfaces to be stable at this time.

CLI

nostrdb comes with a handy ndb command line tool for interacting with nostrdb databases. The tool is relatively new, and only supports a few commands.

Usage

usage: ndb [--skip-verification] [-d db_dir] <command>

commands

	stat
	search [--oldest-first] [--limit 42] <fulltext query>
	query [-k 42] [-k 1337] [-l 42]
	import <line-delimited json file>

settings

	--skip-verification  skip signature validation
	-d <db_dir>          set database directory

Building

$ make ndb

Fulltext Queries

nostrdb supports fulltext queries. You can import some test events like so:

$ make testdata/many-events.json
$ ndb --skip-verification import testdata/many-events.json
$ ndb search --limit 2 --oldest-first 'nosy ostrich'

[01] K<'ostrich' 7 1671217526 note_id:253309>
Q: What do you call a nosy ostrich?
A: A nosTrich!