Gun-cli NPM | npm.io

gun-cli

DISCLAIMER: WORK IN PROGRESS/NOT PRODUCTION-READY

gun runs a GUN server from your command line

GUN is a distributed, offline-first, realtime graph database engine with built-in encryption. It's a small, easy, and fast data sync and storage system that runs everywhere JavaScript does.

Installation

yarn global add gun-cli     OR     npm install -g gun-cli

Example: Watching an expression

start a local gun peer

gun --host 127.0.0.1 --watch foo.bar

access it from your browser

<html>
	<script src="https://cdn.jsdelivr.net/npm/gun/gun.js"></script>
	<script>
		const gun = Gun('http://127.0.0.1:8765/gun')
		gun.get('foo').get('bar').put('baz ' + Date.now())
	</script>
</html>

see foo.bar update in your command line

22:41:50        foo.bar => "baz 1570135310381"

Example: Load and print data from a remote peer

gun print flux.bar --file false --peers 127.0.0.1 --debounce 200 --timeout 2000

This will try to load flux.bar from http://127.0.0.1:8765/gun (extending the provided IP to a full gun URL with the default port 8765). If the query does not resolve within two seconds, the attempt will timeout. However, if the peer can resolve our query, the answers that do come streaming in are debounced with a 200 ms interval, i.e. we try to wait for a full .load() of the data we're interested in.

Example: Using https

ls ./mydomain-certs
> ca.pem cert.pem key.pem

gun --port 443 --certs ./mydomain-certs

Under the hood, this just uses require('https').createServer() with the respective params ca, cert, and key.

Example: Creating a redundant mesh network

Connecting two browsers, A and B, over a mesh of gun peers, 1 through 4

start a small mesh network of gun servers, each listening on a different IP and saving data in a different folder.

gun --host 127.0.0.1 --peers 127.0.0.3,127.0.0.4  --file ./data1 # 1
gun --host 127.0.0.2 --peers 127.0.0.3,127.0.0.4  --file ./data2 # 2

gun --host 127.0.0.3 --peers 127.0.0.1,127.0.0.2  --file ./data3 # 3
gun --host 127.0.0.4 --peers 127.0.0.1,127.0.0.2  --file ./data4 # 4

connect two browsers, A and B, over this network

Browser A

<html>
	<script src="https://cdn.jsdelivr.net/npm/gun/gun.js"></script>
	<script>
		const peers = [
			'http://127.0.0.1:8765/gun',
			'http://127.0.0.2:8765/gun'
		]
		const gun = Gun({peers})
		gun.get('foo').get('heartbeat').on(heartbeat => {
			const time = new Date(heartbeat).toLocaleTimeString()
			console.log(`last heartbeat was at ${time}`)
		})
	</script>
</html>

Browser B

<html>
	<script src="https://cdn.jsdelivr.net/npm/gun/gun.js"></script>
	<script>
		const peers = [
			'http://127.0.0.3:8765/gun',
			'http://127.0.0.4:8765/gun'
		]
		const gun = Gun({peers})
		setInterval(() => {
			gun.get('foo').get('heartbeat').put(Date.now())
		}, 1000)
	</script>
</html>

now play around with shutting down individual peers and bringing them back online

As long as there is a path through the mesh network, the heartbeats will propagate from B to A.

But if peers 1 and 2 (or peers 3 and 4) simultainiously go down, A and B are seperated and updates won't go through. However, GUN peers will try to reestablish the connection to a lost peer, so as soon as you bring one of the peers back online, they will reconnect and updates will go through again.

Usage

gun [command] [options]

COMMANDS
serve                           [default] start a gun server on http
print NODEPATH                  load NODEPATH and print as JSON
version                         print version numbers and exit

GENERAL OPTIONS
--file PATH         ./gundata/  set file parameter of Gun()
--peers STRING                  comma-seperated list of URLs and IPs
                                (IPs are expanded to http://IP:8765/gun)
--no-color                      do not use any colors in output
--debug                         print GUN debug info
--silent                        reduce command line output
--repl                          go into a repl (with gun instace)

[serve] OPTIONS
--host STRING       0.0.0.0     set the ip to listen on
--port NUMBER       8765        set the port to listen on
--watch PATH                    log changes with gun.path(PATH).on()
--certs PATH        ./certs     use https with cert files from PATH
                                (key.pem, cert.pem, ca.pem)
--nocerts                       disable auto-discovery of ./certs
--webrtc            false       load lib/webrtc

[print] OPTIONS
--out FILENAME                  write to FILENAME instead of stdout
--indent STRING                 indent characters for JSON output
--debounce NUMBER   50          debounce .load() to resolve nested data
                                set to 0 to disable debouncing
--timeout NUMBER    1000        wait this much for answers to your request