mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Pavel Orlov
3c972fc19e
The PR provides API for obtaining: - the weight required to execute an XCM message, - a list of acceptable `AssetId`s for message execution payment, - the cost of the weight in the specified acceptable `AssetId`. It is meant to address an issue where one has to guess how much fee to pay for execution. Also, at the moment, a client has to guess which assets are acceptable for fee execution payment. See the related issue https://github.com/paritytech/polkadot-sdk/issues/690. With this API, a client is supposed to query the list of the supported asset IDs (in the XCM version format the client understands), weigh the XCM program the client wants to execute and convert the weight into one of the acceptable assets. Note that the client is supposed to know what program will be executed on what chains. However, having a small companion JS library for the pallet-xcm and xtokens should be enough to determine what XCM programs will be executed and where (since these pallets compose a known small set of programs). ```Rust pub trait XcmPaymentApi<Call> where Call: Codec, { /// Returns a list of acceptable payment assets. /// /// # Arguments /// /// * `xcm_version`: Version. fn query_acceptable_payment_assets(xcm_version: Version) -> Result<Vec<VersionedAssetId>, Error>; /// Returns a weight needed to execute a XCM. /// /// # Arguments /// /// * `message`: `VersionedXcm`. fn query_xcm_weight(message: VersionedXcm<Call>) -> Result<Weight, Error>; /// Converts a weight into a fee for the specified `AssetId`. /// /// # Arguments /// /// * `weight`: convertible `Weight`. /// * `asset`: `VersionedAssetId`. fn query_weight_to_asset_fee(weight: Weight, asset: VersionedAssetId) -> Result<u128, Error>; /// Get delivery fees for sending a specific `message` to a `destination`. /// These always come in a specific asset, defined by the chain. /// /// # Arguments /// * `message`: The message that'll be sent, necessary because most delivery fees are based on the /// size of the message. /// * `destination`: The destination to send the message to. Different destinations may use /// different senders that charge different fees. fn query_delivery_fees(destination: VersionedLocation, message: VersionedXcm<()>) -> Result<VersionedAssets, Error>; } ``` An [example](https://gist.github.com/PraetorP/4bc323ff85401abe253897ba990ec29d) of a client side code. --------- Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com> Co-authored-by: Adrian Catangiu <adrian@parity.io> Co-authored-by: Daniel Shiposha <mrshiposha@gmail.com>
Rococo: v2.1
Rococo is a testnet runtime with no stability guarantees.
How to build rococo runtime
EpochDurationInBlocks parameter is configurable via ROCOCO_EPOCH_DURATION environment variable. To build wasm
runtime blob with customized epoch duration the following command shall be executed:
ROCOCO_EPOCH_DURATION=10 ./polkadot/scripts/build-only-wasm.sh rococo-runtime /path/to/output/directory/
How to run rococo-local
The Cumulus Tutorial details building, starting, and
testing rococo-local and parachains connecting to it.
How to register a parachain on the Rococo testnet
The parachain registration process on the public Rococo testnet is also outlined.