paritytech / pallet-contracts-xcm

pallet-contracts chain extensions that allows sending and receiving XCM messages.

pallet-contracts-xcm

pallet-contracts chain extensions that allows sending XCM messages and receiving replies. This repository contains the extension itself that can be used in the runtime and also the ink! implementation to be imported into a contract.

pallet-contracts-xcm's Issues

Error when building contract with XCM.

I'm trying to implement this xcm chain extension so we can put a simple contract that sends a XCM call.
The problem i'm facing is when i try to compile the contract with the given Cargo.toml, i get the following errors:

➜  ink git:(master) ✗ cargo +nightly contract build

....

error: the `#[global_allocator]` in ink_allocator conflicts with global allocator in: sp_io

error: duplicate lang item in crate `sp_io` (which `sp_application_crypto` depends on): `panic_impl`.
  |
  = note: the lang item is first defined in crate `ink_env` (which `flipper` depends on)
  = note: first definition in `ink_env` loaded from /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libink_env-0acca4fc7a95b368.rlib
  = note: second definition in `sp_io` loaded from /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libsp_io-7276ad9650247190.rlib, /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libsp_io-7276ad9650247190.rmeta

error: duplicate lang item in crate `sp_io` (which `sp_application_crypto` depends on): `oom`.
  |
  = note: the lang item is first defined in crate `ink_allocator` (which `ink_env` depends on)
  = note: first definition in `ink_allocator` loaded from /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libink_allocator-f7c621310e573610.rlib, /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libink_allocator-f7c621310e573610.rmeta
  = note: second definition in `sp_io` loaded from /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libsp_io-7276ad9650247190.rlib, /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libsp_io-7276ad9650247190.rmeta

error: could not compile `extension-xcm` due to 3 previous errors

Is there anything i'm not taking into account when building the contract? I have tried with many variants adding the xcm crate dependency from a new project using cargo contract new ..., but the error is the same.

Also it would be nice to know if there is there any working example of this extension where i can take references?

Thanks!

Upgrade ink! contract to ink! v4

See the migration guide here: https://use.ink/faq/migrating-from-ink-3-to-4

Upgrade chain extension to XCM v3

Right now, the chain extension in this repository supports only XCM v2. As part of this issue the extension should be upgraded to XCM v3.