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@ascjones ascjones released this 15 Feb 16:42
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v4.0.0
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Learn about vigilant mode.

Version 4.0.0

The latest stable release of ink! is here 🥳

This version brings a lot of usability improvements, making the language better suited for the needs of production parachains.

A couple of highlights include:

  • Changes to how contract storage works, which significantly reduced the sizes of
    contract binaries
  • A new end-to-end testing framework, letting you easily write integration tests
  • Changes to the metadata format, which (in part) makes error handling more expressive

There's a lot more to dig through, so take some time to poke around the CHANGELOG (including the 4.0.0-alpha and 4.0.0-beta releases).

You may notice there have been a few breaking changes. No need to be scared though, we wrote up a migration guide covering all of the breaking changes and how to update your ink! 3.x contract accordingly.

Thanks to everyone that helped make this release possible ❤️

Compatibility

In order to build contracts which use ink! v4.0.0 you need to use cargo-contract v2.0.0. You can install it as follows:

cargo install cargo-contract --forced --locked

You will also need to use a version of pallet-contracts later than polkadot-v0.9.37 in your node.

The v0.24.0 release of the substrate-contracts-node is compatible with the ink! 4.0.0 release.

For full compatibility requirements see the migration guide.

Added

  • Add Mapping::contains(key) and Mapping::insert_return_size(key, val) ‒ #1224
  • Add payment-channel example ‒ #1248 (thanks @kanishkatn!)
  • Add version field to ink! metadata ‒ #1313
  • The rand-extension example has been adapted to an updated version of the ChainExtension API ‒ #1356
  • Add ink_env::pay_with_call! helper macro for off-chain emulation of sending payments with contract message calls ‒ #1379
  • Allow using Result<Self, Error> as a return type in constructors ‒ #1446
  • Add Mapping::take() function allowing to get a value removing it from storage ‒ #1461
  • Add E2E testing framework MVP ‒ #1395
  • Add E2E tests for Mapping functions - #1492
  • E2E: expose call dry-run method ‒ #1624
  • Make cross-contract callee non-optional ‒ #1636
  • Support custom environment in E2E tests - #1645 (thanks @pmikolajczyk41!)

Changed

  • Contract size optimization in case contract doesn't accept payment ‒ #1267 (thanks @xgreenx!)
  • Move ink! linter into ink repository ‒ #1361
  • Introduce ink entrance crate ‒ #1223
  • Use XXH32 instead of sha256 for calculating storage keys ‒ #1393
  • Storage Refactoring ‒ #1331
  • Add support for language level errors (LangError) ‒ #1450
  • Return LangErrors from constructors ‒ #1504
  • Update scale-info requirement to 2.3 ‒ #1467
  • Merge Mapping::insert(key, val) and Mapping::insert_return_size(key, val) into one method - #1463
  • FFI: no more __unstable__ wasm import module ‒ #1522
  • Clean up CallBuilder return() type ‒ #1525
  • Fix trait message return type metadata ‒ #1531
  • Bump Dylint dependencies ‒ #1551
  • Stabilize take_storage ‒ #1568
  • Chain Extension: Evaluation of method return type at compile time ‒ #1569
  • Make more functions be const ‒ #1574 (thanks @yjhmelody!)
  • Unify fallible and non fallible instantiate methods ‒ #1591
  • Make CallBuilder and CreateBuilder error handling optional ‒ #1602
  • Rename CallBuilder::fire() method to invoke() ‒ #1604
  • chore: add minimum rust version to the ink crate ‒ #1609 (thanks @Kurtsley!)
  • Rename _checked codegen call methods with try_ ‒ #1621
  • Bump Substrate and subxt dependencies ‒ #1549
  • E2E: spawn a separate contracts node instance per test ‒ #1642

Fixed

  • Trim single whitespace prefix in the metadata docs field ‒ #1385
  • Allow pay_with_call to take multiple arguments ‒ #1401
  • Add Determinism enum from pallet-contracts ‒ #1547
  • Added missed WhereClosure for the generics into storage_item ‒ #1536 (thanks @xgreenx!)

Removed

  • Implement ecdsa_to_eth_address() and remove eth_compatibility crate ‒ #1233
  • Remove wee-alloc ‒ #1403
  • Remove ink_env::random function ‒ #1442
  • Remove Default implementation for AccountId ‒ #1255
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