Crowdloan rewards precompiles

Cargo.toml

@@ -7,7 +7,7 @@ members = [
     'node',
     'node/cli',
     'node/service',
-    'bin/utils/moonkey'
+    'bin/utils/moonkey',
 ]
 exclude = [
     'bin/utils/moonkey'

precompiles/crowdloan-rewards/Cargo.toml

@@ -0,0 +1,47 @@
+[package]
+name = "crowdloan-rewards-precompiles"
+version = "0.6.0"
+authors = ["PureStake"]
+edition = "2018"
+description = "A Precompile to make crowdloan rewards accessible to pallet-evm"
+
+[dependencies]
+log = "0.4"
+rustc-hex = { version = "2.0.1", default-features = false }
+
+codec = { package = "parity-scale-codec", version = "2.0.0", default-features = false }
+frame-support = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.8", default-features = false }
+evm = { version = "0.27.0", default-features = false, features = ["with-codec"] }
+sp-std = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-v0.9.8" }
+sp-core = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-v0.9.8" }
+sp-io = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-v0.9.8" }
+pallet-evm = { git = "https://github.com/purestake/frontier", default-features = false, branch = "moonbeam-polkadot-v0.9.8" }
+pallet-crowdloan-rewards = { git = "https://github.com/purestake/crowdloan-rewards", default-features = false, branch = "main" }
+frame-system = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-v0.9.8" }
+
+[dev-dependencies]
+hex = "0.4"
+hex-literal = "0.3.1"
+sp-runtime = { git="https://github.com/paritytech/substrate", branch="polkadot-v0.9.8" }
+pallet-balances = { git="https://github.com/paritytech/substrate", branch="polkadot-v0.9.8" }
+pallet-timestamp = { git="https://github.com/paritytech/substrate", branch="polkadot-v0.9.8" }
+pallet-scheduler = { git="https://github.com/paritytech/substrate", branch="polkadot-v0.9.8" }
+max-encoded-len = { git="https://github.com/paritytech/substrate", branch="polkadot-v0.9.8", features=["derive"] }
+serde = "1.0.100"
+derive_more = "0.99"
+cumulus-primitives-parachain-inherent = { git = "https://github.com/purestake/cumulus", default-features = false, branch = "joshy-np098" }
+cumulus-pallet-parachain-system = { git = "https://github.com/purestake/cumulus", default-features = false, branch = "joshy-np098" }
+cumulus-primitives-core = { git = "https://github.com/purestake/cumulus", default-features = false, branch = "joshy-np098" }
+cumulus-test-relay-sproof-builder = { git = "https://github.com/purestake/cumulus", default-features = false, branch = "joshy-np098" }
+
+[features]
+default = ["std"]
+std = [
+    "codec/std",
+    "frame-support/std",
+    "evm/std",
+    "sp-std/std",
+    "sp-core/std",
+    "pallet-crowdloan-rewards/std",
+    "frame-system/std",
+]

precompiles/crowdloan-rewards/CrowdloanInterface.sol

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-3.0-only
+pragma solidity >=0.8.0;
+
+/// The interface through which solidity contracts will interact with Parachain Staking
+/// We follow this same interface including four-byte function selectors, in the precompile that
+/// wraps the pallet
+interface CrowdloanRewards {
+    // First some simple accessors
+    function is_contributor(address contributor) external view returns (bool);
+    function reward_info(address contributor) external view returns (uint256, uint256);
+    // Now the dispatchables
+
+
+    /// Request to leave the set of candidates. If successful, the account is immediately
+    /// removed from the candidate pool to prevent selection as a collator, but unbonding is
+    /// executed with a delay of `BondDuration` rounds.
+    function claim() external;
+
+}
+
+// These are the selectors generated by remix following this advice
+// https://ethereum.stackexchange.com/a/73405/9963
+// Eventually we will probably want a better way of generating these and copying them to Rust
+
+{ 
+    "53440c90": "is_contributor(address)"
+    "76f70249": "reward_info(address)"
+    "4e71d92d": "claim()" 
+}