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Adrian Catangiu e7651cf41b pallet-xcm: add new flexible transfer_assets() call/extrinsic (#2388 )

# Motivation (+testing)

### Enable easy `ForeignAssets` transfers using `pallet-xcm` 

We had just previously added capabilities to teleport fees during
reserve-based transfers, but what about reserve-transferring fees when
needing to teleport some non-fee asset?

This PR aligns everything under either explicit reserve-transfer,
explicit teleport, or this new flexible `transfer_assets()` which can
mix and match as needed with fewer artificial constraints imposed to the
user.

This will enable, for example, a (non-system) parachain to teleport
their `ForeignAssets` assets to AssetHub while using DOT to pay fees.
(the assets are teleported - as foreign assets should from their owner
chain - while DOT used for fees can only be reserve-based transferred
between said parachain and AssetHub).

Added `xcm-emulator` tests for this scenario ^.

# Description

Reverts `(limited_)reserve_transfer_assets` to only allow reserve-based
transfers for all `assets` including fees.

Similarly `(limited_)teleport_assets` only allows teleports for all
`assets` including fees.
    
For complex combinations of asset transfers where assets and fees may
have different reserves or different reserve/teleport trust
configurations, users can use the newly added `transfer_assets()`
extrinsic which is more flexible in allowing more complex scenarios.

`assets` (excluding `fees`) must have same reserve location or otherwise
be teleportable to `dest`.
No limitations imposed on `fees`.

- for local reserve: transfer assets to sovereign account of destination
chain and forward a notification XCM to `dest` to mint and deposit
reserve-based assets to `beneficiary`.
- for destination reserve: burn local assets and forward a notification
to `dest` chain to withdraw the reserve assets from this chain's
sovereign account and deposit them to `beneficiary`.
- for remote reserve: burn local assets, forward XCM to reserve chain to
move reserves from this chain's SA to `dest` chain's SA, and forward
another XCM to `dest` to mint and deposit reserve-based assets to
`beneficiary`.
- for teleports: burn local assets and forward XCM to `dest` chain to
mint/teleport assets and deposit them to `beneficiary`.

## Review notes

Only around 500 lines are prod code (see `pallet_xcm/src/lib.rs`), the
rest of the PR is new tests and improving existing tests.

---------

Co-authored-by: command-bot <>

2023-12-06 13:18:12 +02:00

bridge-hub-rococo

pallet-xcm: add new flexible transfer_assets() call/extrinsic (#2388 )

2023-12-06 13:18:12 +02:00

bridge-hub-westend

pallet-xcm: add new flexible transfer_assets() call/extrinsic (#2388 )

2023-12-06 13:18:12 +02:00

docs

BridgeHubKusama - initial setup - (chain_spec + basic runtime without any bridging pallets) (#1764 )

2022-12-02 14:06:39 +01:00

test-utils

Enforce consistent and correct toml formatting (#2518 )

2023-12-01 07:38:02 +00:00

README.md

[testnet] Remove Wococo stuff from BridgeHubRococo/AssetHubRococo (#2300 )

2023-11-15 17:40:07 +02:00

README.md

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:

BridgeHubPolkadot system parachain:
1. Polkadot <-> Kusama bridge
2. Polkadot <-> Ethereum bridge (Snowbridge)
BridgeHubKusama system parachain:
1. Kusama <-> Polkadot bridge
2. 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

We need polkadot binary with "fast-runtime" feature:

cd <polkadot-sdk-git-repo-dir>
cargo build --release --features fast-runtime --bin polkadot
cp target/release/polkadot ~/local_bridge_testing/bin/polkadot

cargo build --release --features fast-runtime --bin polkadot-prepare-worker
cp target/release/polkadot-prepare-worker ~/local_bridge_testing/bin/polkadot-prepare-worker

cargo build --release --features fast-runtime --bin polkadot-execute-worker
cp target/release/polkadot-execute-worker ~/local_bridge_testing/bin/polkadot-execute-worker


---
# 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 <polkadot-sdk-git-repo-dir>

cargo build --release -p polkadot-parachain-bin
cp target/release/polkadot-parachain ~/local_bridge_testing/bin/polkadot-parachain
cp target/release/polkadot-parachain ~/local_bridge_testing/bin/polkadot-parachain-asset-hub

How to test local Rococo <-> Westend bridge

Run Rococo/Westend chains with zombienet

cd <polkadot-sdk-git-repo-dir>

# 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 ./cumulus/zombienet/bridge-hubs/bridge_hub_rococo_local_network.toml

cd <polkadot-sdk-git-repo-dir>

# Westend + BridgeHubWestend + AssetHub for Westend (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_WESTEND=~/local_bridge_testing/bin/polkadot-parachain-asset-hub \
	~/local_bridge_testing/bin/zombienet-linux --provider native spawn ./cumulus/zombienet/bridge-hubs/bridge_hub_westend_local_network.toml

Init bridge and run relayer between BridgeHubRococo and BridgeHubWestend

Accounts of BridgeHub parachains:

Bob is pallet owner of all bridge pallets

Run with script

cd <polkadot-sdk-git-repo-dir>

./cumulus/scripts/bridges_rococo_westend.sh run-relay

Check relay-chain headers relaying:

Rococo parachain: - https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A8943#/chainstate - Pallet: bridgeWestendGrandpa - Keys: bestFinalized()
Westend 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: bridgeWestendParachains - Keys: parasInfo(None)
Westend parachain: - https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A8945#/chainstate - Pallet: bridgeRococoParachains - Keys: parasInfo(None)

Initialize configuration for transfer asset over bridge (ROCs/WNDs)

This initialization does several things:

creates ForeignAssets for wrappedROCs/wrappedWNDs
drips SA for AssetHubRococo on AssetHubWestend (and vice versa) which holds reserved assets on source chains

cd <polkadot-sdk-git-repo-dir>

./cumulus/scripts/bridges_rococo_westend.sh init-asset-hub-rococo-local
./cumulus/scripts/bridges_rococo_westend.sh init-bridge-hub-rococo-local
./cumulus/scripts/bridges_rococo_westend.sh init-asset-hub-westend-local
./cumulus/scripts/bridges_rococo_westend.sh init-bridge-hub-westend-local

Send messages - transfer asset over bridge (ROCs/WNDs)

Do reserve-backed transfers:

cd <polkadot-sdk-git-repo-dir>

# ROCs from Rococo's Asset Hub to Westend's.
./cumulus/scripts/bridges_rococo_westend.sh reserve-transfer-assets-from-asset-hub-rococo-local

cd <polkadot-sdk-git-repo-dir>

# WNDs from Westend's Asset Hub to Rococo's.
./cumulus/scripts/bridges_rococo_westend.sh reserve-transfer-assets-from-asset-hub-westend-local

open explorers: (see zombienets)
- AssetHubRococo (see events xcmpQueue.XcmpMessageSent, polkadotXcm.Attempted) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:9910#/explorer
- BridgeHubRococo (see bridgeWestendMessages.MessageAccepted) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:8943#/explorer
- BridgeHubWestend (see bridgeRococoMessages.MessagesReceived, xcmpQueue.XcmpMessageSent) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:8945#/explorer
- AssetHubWestend (see foreignAssets.Issued, xcmpQueue.Success) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:9010#/explorer
- BridgeHubRocococ (see bridgeWestendMessages.MessagesDelivered) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:8943#/explorer

Do reserve withdraw transfers: (when previous is finished)

cd <polkadot-sdk-git-repo-dir>

# wrappedWNDs from Rococo's Asset Hub to Westend's.
./cumulus/scripts/bridges_rococo_westend.sh withdraw-reserve-assets-from-asset-hub-rococo-local

cd <polkadot-sdk-git-repo-dir>

# wrappedROCs from Westend's Asset Hub to Rococo's.
./cumulus/scripts/bridges_rococo_westend.sh withdraw-reserve-assets-from-asset-hub-westend-local

Claim relayer's rewards on BridgeHubRococo and BridgeHubWestend

Accounts of BridgeHub parachains:

//Charlie is relayer account on BridgeHubRococo
//Charlie is relayer account on BridgeHubWestend

cd <polkadot-sdk-git-repo-dir>

# Claim rewards on BridgeHubWestend:
./cumulus/scripts/bridges_rococo_westend.sh claim-rewards-bridge-hub-rococo-local

# Claim rewards on BridgeHubWestend:
./cumulus/scripts/bridges_rococo_westend.sh claim-rewards-bridge-hub-westend-local

open explorers: (see zombienets)
- BridgeHubRococo (see 2x bridgeRelayers.RewardPaid) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:8943#/explorer
- BridgeHubWestend (see 2x bridgeRelayers.RewardPaid) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:8945#/explorer

How to test local BridgeHubKusama/BridgeHubPolkadot

TODO: see # !!! READ HERE above