Baedeker

The substrate chain deployment and testing framework.

What is baedeker?

Baedeker provides chain-spec modification, key generation, and chain deployment configurator based on UniqueNetwork’s chainql substrate query language.

Mixing

Baedeker provides one useful primitive for applying complex object transformations in imperative fashion: mixers.

There is two mixers in baedeker:

bdk.mixer(mixin)(value)

mixin may have the following forms:

• null: no transformation required, continue as is

• object: continue with the provided object, extended from the base object

• array: process every array element as separate mixin

• function: this is where the fun begins. This mixer will be called with the two arguments: prev and final, where prev is the base object, and final is a final value with all the mixins applied.

In a nutshell, function mixin will work as a y-combinator, which in the basic form looks like

local ycombinator(f) =
	local v = f(v);
	v;

ycombinator(function(final) {
	a: 1,
	// Works like `self.a`
	b: final.a,
})

Example

local renameData(prev) =
	prev {
		_data::: prev.unconfortableDataFieldName,
		unconfortableDataFieldName:: error 'was renamed to _data',
	};
local renameDataBack(prev) =
	prev {
		unconfortableDataFieldName::: prev._data,
		_data:: error 'was renamed back',
	};

local addField(key, value) =
	prev {_data+: {
		[key]: value,
	}};

local mixin = bdk.mixer([
	renameData,
	addField('b', 20),
	addField('c', 30),
	renameDataBack,
]);

std.assertEquals(mixin({
	unconfortableDataFieldName: {
		a: 10,
	},
}), {
	unconfortableDataFieldName: {
		a: 10,
		b: 20,
		c: 30,
	},
})

Alternatives

Chopsticks: Simulates network, instead of really launching it.

Zombienet: Only intended for launching ephemeral substrate networks.