Question: Runtime Calls included in Metadata

[NachoPal]

Are Runtime Calls (https://polkadot.js.org/apps/#/runtime) part of the Metadata? I was checking the documentation and it looks they are not. Is it correct? In that case, are all those Runtime Calls types hardcoded in polkadot-js?

I was wondering if it would be possible to add also the Runtime Calls types to the Metadata. In that way, in some cases developers could build a custom Runtime API instead of a custom RPCs, with the benefit of not having to generate the custom types.

[jacogr]

At this point they are hardcoded - there is an issue logged on Substrate to make this available in the metadata.

For type generation, there is a new key in the definitions that pull in these - so you can add them to your definitions and typegen will spit out the correct values. This is also how the ones inside the API are generated, some examples -

api/packages/types/src/interfaces/aura/runtime.ts

Lines 6 to 24 in 434f969

	export const runtime: DefinitionsCall = {
	AuraApi: [
	{
	methods: {
	authorities: {
	description: 'Return the current set of authorities.',
	params: [],
	type: 'Vec<AuthorityId>'
	},
	slot_duration: {
	description: 'Returns the slot duration for Aura.',
	params: [],
	type: 'SlotDuration'
	}
	},
	version: 1
	}
	]
	};

Which is in turn exposed here on the definition -

api/packages/types/src/interfaces/aura/definitions.ts

Line 13 in 434f969

runtime,

So you can add the exact same to your definitions and it will be part of the runtime injection as well as the typegen. (It basically acts the same way as RPC definitions - so they need to be provided in the API constructor - that is until we have these in metadata and all this extra definition steps can be dropped)

[NachoPal]

Thanks Jaco, I guess you are referring to this Issue: paritytech/substrate#11648

[jacogr]

Sorry, fat fingers. Yes, the linked issue is the one.

[polkadot-js-bot]

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