# Description ## Summary Previously, the `pallet_xcm::do_reserve_transfer_assets` and `pallet_xcm::do_teleport_assets` functions relied on weight estimation for remote chain execution, which was based on guesswork derived from the local chain. This approach led to complications for runtimes that did not provide or support specific [XCM configurations](https://github.com/paritytech/polkadot-sdk/blob/7cbe0c76ef8fd2aabf9f07de0156941ce3ed44b0/polkadot/xcm/xcm-executor/src/config.rs#L43-L47) for `IsReserve` or `IsTeleporter`. Consequently, such runtimes had to resort to implementing hard-coded weights for XCM instructions like `reserve_asset_deposited` or `receive_teleported_asset` to support extrinsics such as `pallet_xcm::reserve_transfer_assets` and `pallet_xcm::teleport_assets`, which depended on remote weight estimation. The issue of remote weight estimation was addressed and resolved by [Pull Request #1645](https://github.com/paritytech/polkadot-sdk/pull/1645), which removed the need for remote weight estimation. ## Solution As a continuation of this improvement, the current PR proposes further cleanup by removing unnecessary hard-coded values and rectifying benchmark results with `Weight::MAX` that previously used `T::BlockWeights::get().max_block` as an override for unsupported XCM instructions like `ReserveAssetDeposited` and `ReceiveTeleportedAsset`. ## Questions - [x] Can we remove now also `Hardcoded till the XCM pallet is fixed` for `deposit_asset`? E.g. for AssetHubKusama [here](https://github.com/paritytech/polkadot-sdk/blob/7cbe0c76ef8fd2aabf9f07de0156941ce3ed44b0/cumulus/parachains/runtimes/assets/asset-hub-kusama/src/weights/xcm/mod.rs#L129-L134) - [x] Are comments like [this](https://github.com/paritytech/polkadot-sdk/blob/7cbe0c76ef8fd2aabf9f07de0156941ce3ed44b0/polkadot/runtime/kusama/src/weights/xcm/mod.rs#L94) `// Kusama doesn't support ReserveAssetDeposited, so this benchmark has a default weight` still relevant? Shouldnt be removed/changed? ## TODO - [x] `bench bot` regenerate xcm weights for all runtimes - [x] remove hard-coded stuff from system parachain weight files - [ ] when merged, open `polkadot-fellow/runtimes` PR ## References Fixes #1132 Closes #1132 Old polkadot repo [PR](https://github.com/paritytech/polkadot/pull/7546) --------- Co-authored-by: command-bot <>
- Bridge-hub Parachains
Bridge-hub Parachains
BridgeHub(s) are system parachains that will house trustless bridges from the local ecosystem to others. The current trustless bridges planned for the BridgeHub(s) are:
BridgeHubPolkadotsystem parachain:- Polkadot <-> Kusama bridge
- Polkadot <-> Ethereum bridge (Snowbridge)
BridgeHubKusamasystem parachain:- Kusama <-> Polkadot bridge
- Kusama <-> Ethereum bridge The high-level responsibilities of each bridge living on BridgeHub:
- sync finality proofs between relay chains (or equivalent)
- sync finality proofs between BridgeHub parachains
- pass (XCM) messages between different BridgeHub parachains
Requirements for local run/testing
# Prepare empty directory for testing
mkdir -p ~/local_bridge_testing/bin
mkdir -p ~/local_bridge_testing/logs
---
# 1. Install zombienet
Go to: https://github.com/paritytech/zombienet/releases
Copy the apropriate binary (zombienet-linux) from the latest release to ~/local_bridge_testing/bin
---
# 2. Build polkadot binary
git clone https://github.com/paritytech/polkadot.git
cd polkadot
# if you want to test Kusama/Polkadot bridge, we need "sudo pallet + fast-runtime",
# so please, find the latest polkadot's repository branch `it/release-vX.Y.Z-fast-sudo`
# e.g:
# git checkout -b it/release-v0.9.43-fast-sudo --track origin/it/release-v0.9.43-fast-sudo
cargo build --release --features fast-runtime
cp target/release/polkadot ~/local_bridge_testing/bin/polkadot
---
# 3. Build substrate-relay binary
git clone https://github.com/paritytech/parity-bridges-common.git
cd parity-bridges-common
# checkout desired branch or use master:
# git checkout -b master --track origin/master
# `polkadot-staging` (recommended) is stabilized and compatible for Cumulus releases
# `master` is latest development
git checkout -b polkadot-staging --track origin/polkadot-staging
cargo build --release -p substrate-relay
cp target/release/substrate-relay ~/local_bridge_testing/bin/substrate-relay
---
# 4. Build cumulus polkadot-parachain binary
cd <cumulus-git-repo-dir>
# checkout desired branch or use master:
# git checkout -b master --track origin/master
cargo build --release --locked --bin polkadot-parachain
cp target/release/polkadot-parachain ~/local_bridge_testing/bin/polkadot-parachain
cp target/release/polkadot-parachain ~/local_bridge_testing/bin/polkadot-parachain-asset-hub
# !!! READ HERE (TODO remove once all mentioned branches bellow are merged)
# The use case "moving assets over bridge" is not merged yet and is implemented in separate branches.
# So, if you want to try it, you need to checkout different branch and continue with these instructions there.
# For Kusama/Polkadot local bridge testing:
#
# build BridgeHubs (polkadot-parachain) from branch:
# git checkout -b bridge-hub-kusama-polkadot --track origin/bridge-hub-kusama-polkadot
# cargo build --release --locked --bin polkadot-parachain
# cp target/release/polkadot-parachain ~/local_bridge_testing/bin/polkadot-parachain
#
# build AssetHubs (polkadot-parachain-asset-hub) from branch:
# git checkout -b bko-transfer-asset-via-bridge-pallet-xcm --track origin/bko-transfer-asset-via-bridge-pallet-xcm
# cargo build --release --locked --bin polkadot-parachain
# cp target/release/polkadot-parachain ~/local_bridge_testing/bin/polkadot-parachain-asset-hub
# For Rococo/Wococo local bridge testing:
#
# build AssetHubs (polkadot-parachain-asset-hub) from branch:
# git checkout -b bko-transfer-asset-via-bridge-pallet-xcm-ro-wo --track origin/bko-transfer-asset-via-bridge-pallet-xcm-ro-wo
# cargo build --release --locked --bin polkadot-parachain
# cp target/release/polkadot-parachain ~/local_bridge_testing/bin/polkadot-parachain-asset-hub
How to test local Rococo <-> Wococo bridge
Run chains (Rococo + BridgeHub + AssetHub, Wococo + BridgeHub + AssetHub) with zombienet
# Rococo + BridgeHubRococo + AssetHub for Rococo (mirroring Kusama)
POLKADOT_BINARY_PATH=~/local_bridge_testing/bin/polkadot \
POLKADOT_PARACHAIN_BINARY_PATH=~/local_bridge_testing/bin/polkadot-parachain \
POLKADOT_PARACHAIN_BINARY_PATH_FOR_ASSET_HUB_ROCOCO=~/local_bridge_testing/bin/polkadot-parachain-asset-hub \
~/local_bridge_testing/bin/zombienet-linux --provider native spawn ./zombienet/bridge-hubs/bridge_hub_rococo_local_network.toml
# Wococo + BridgeHubWococo + AssetHub for Wococo (mirroring Polkadot)
POLKADOT_BINARY_PATH=~/local_bridge_testing/bin/polkadot \
POLKADOT_PARACHAIN_BINARY_PATH=~/local_bridge_testing/bin/polkadot-parachain \
POLKADOT_PARACHAIN_BINARY_PATH_FOR_ASSET_HUB_WOCOCO=~/local_bridge_testing/bin/polkadot-parachain-asset-hub \
~/local_bridge_testing/bin/zombienet-linux --provider native spawn ./zombienet/bridge-hubs/bridge_hub_wococo_local_network.toml
Run relayer (BridgeHubRococo, BridgeHubWococo)
Accounts of BridgeHub parachains:
Bobis pallet owner of all bridge pallets
Run with script (alternative 1)
cd <cumulus-git-repo-dir>
./scripts/bridges_rococo_wococo.sh run-relay
Run with binary (alternative 2)
Need to wait for parachain activation (start producing blocks), then run:
# 1. Init bridges:
# Rococo -> Wococo
RUST_LOG=runtime=trace,rpc=trace,bridge=trace \
~/local_bridge_testing/bin/substrate-relay init-bridge rococo-to-bridge-hub-wococo \
--source-host localhost \
--source-port 9942 \
--source-version-mode Auto \
--target-host localhost \
--target-port 8945 \
--target-version-mode Auto \
--target-signer //Bob
# Wococo -> Rococo
RUST_LOG=runtime=trace,rpc=trace,bridge=trace \
~/local_bridge_testing/bin/substrate-relay init-bridge wococo-to-bridge-hub-rococo \
--source-host localhost \
--source-port 9945 \
--source-version-mode Auto \
--target-host localhost \
--target-port 8943 \
--target-version-mode Auto \
--target-signer //Bob
# 2. Relay relay-chain headers, parachain headers and messages**
RUST_LOG=runtime=trace,rpc=trace,bridge=trace \
~/local_bridge_testing/bin/substrate-relay relay-headers-and-messages bridge-hub-rococo-bridge-hub-wococo \
--rococo-host localhost \
--rococo-port 9942 \
--rococo-version-mode Auto \
--bridge-hub-rococo-host localhost \
--bridge-hub-rococo-port 8943 \
--bridge-hub-rococo-version-mode Auto \
--bridge-hub-rococo-signer //Charlie \
--wococo-headers-to-bridge-hub-rococo-signer //Bob \
--wococo-parachains-to-bridge-hub-rococo-signer //Bob \
--bridge-hub-rococo-transactions-mortality 4 \
--wococo-host localhost \
--wococo-port 9945 \
--wococo-version-mode Auto \
--bridge-hub-wococo-host localhost \
--bridge-hub-wococo-port 8945 \
--bridge-hub-wococo-version-mode Auto \
--bridge-hub-wococo-signer //Charlie \
--rococo-headers-to-bridge-hub-wococo-signer //Bob \
--rococo-parachains-to-bridge-hub-wococo-signer //Bob \
--bridge-hub-wococo-transactions-mortality 4 \
--lane 00000001
Check relay-chain headers relaying:
- Rococo parachain: - https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A8943#/chainstate - Pallet: bridgeWococoGrandpa - Keys: bestFinalized()
- Wococo parachain: - https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A8945#/chainstate - Pallet: bridgeRococoGrandpa - Keys: bestFinalized()
Check parachain headers relaying:
- Rococo parachain: - https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A8943#/chainstate - Pallet: bridgeWococoParachain - Keys: bestParaHeads()
- Wococo parachain: - https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A8945#/chainstate - Pallet: bridgeRococoParachain - Keys: bestParaHeads()
Send messages - transfer asset over bridge
TODO: see # !!! READ HERE above
How to test live BridgeHubRococo/BridgeHubWococo
(here is still deployed older PoC from branch origin/bko-transfer-asset-via-bridge, which uses custom extrinsic, which
is going to be replaced by pallet_xcm usage)
-
uses account seed on Live Rococo:Rockmine2
cd <cumulus-git-repo-dir> ./scripts/bridges_rococo_wococo.sh transfer-asset-from-asset-hub-rococo -
open explorers: - Rockmine2 (see events
xcmpQueue.XcmpMessageSent,bridgeTransfer.ReserveAssetsDeposited,bridgeTransfer.TransferInitiated) https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Fws-rococo-rockmine2-collator-node-0.parity-testnet.parity.io#/explorer- BridgeHubRococo (see
bridgeWococoMessages.MessageAccepted) https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Frococo-bridge-hub-rpc.polkadot.io#/explorer - BridgeHubWococo (seebridgeRococoMessages.MessagesReceived) https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Fwococo-bridge-hub-rpc.polkadot.io#/explorer - Wockmint (seexcmpQueue.Successfortransfer-assetandxcmpQueue.Failforping-via-bridge) https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Fwococo-wockmint-rpc.polkadot.io#/explorer - BridgeHubRococo (seebridgeWococoMessages.MessagesDelivered)
- BridgeHubRococo (see
How to test local BridgeHubKusama/BridgeHubPolkadot
TODO: see # !!! READ HERE above
