afknapping / go-urbit

Urbit HTTP API implementation in Go

This module provides functionality to communicate with Urbit ships. See Urbit home page for more details about it.

NOTE: the packages in this module are still in experimental stage, and the API may change as it gets more developed -- the major version is still 0.

Basic usage

Connect with an Urbit ship using

ship, err := urbit.Dial(address, passcode, nil)

Note that the code can be obtained with the command |code in Dojo inside the Urbit environment. The returned value is a Client that can be used to send requests and receive events.

// Send a Poke
ship.Poke("chat-hook", jsonMessage)

// Subscribe to a path inside an app. The ID in result can be used to
// identify events containing updates for this subscription.
result, err := ship.Subscribe("chat-store", "/keys")

// ...

// Consume events.
for ev := range ship.Events() {
	switch (ev.Type) {
	case "diff":
		if (ev.ID == result.ID) {
			// ev.Data contains the data
		}
	}
}

It is important to consume the Events channel, because the Client will not try to buffer individual events, so processing only happens when that channel is consumed. Depending on the program, either a separate goroutine or including the processing the in the program's mainloop will be the typical solutions.

The next step after being able to talk, is to know what to talk. Most apps running inside Urbit are able to talk via JSON. Their own protocols are currently only documented in the source code (see /sur in Urbit). It is also helpful to see how requests are created and responses are parsed in Landscape (Urbit's reference web client).

For Go, these definitions can be mapped into types and serialization helpers, see the chat package for example.

Examples

A good way to learn how to use the module is to look at the commented examples. Run each of them with

go run EXAMPLE.go

By default the examples will try to connect with the default address and passcode used running local development ships ("fake zod"). They can also be specified in the command line

go run EXAMPLE.go --addr ADDRESS --code CODE

each example has a few more options, see them with

go run EXAMPLE.go --help