`paint_evm::Event` 没有为 `Event` 实现

Question

在 adding a module to your runtime, I'm trying to implement the Parity Substrate paint-evm trait for the Dothereum Runtime 之后。

根据我之前的工作：

我为 Dothereum 运行时实现了 EVM 特性：

// Implement the EVM Trait for the Dothereum Runtime.
impl evm::Trait for Runtime {
    type FeeCalculator = FixedGasPrice;
    type ConvertAccountId = TruncatedAccountId;
    type Currency = Balances;
    type Event = Event;
    type Precompiles = ();
}

但是，paint_evm::Event 特性没有为 Event 实现：

error: failed to run custom build command for `dothereum-runtime v0.2.2 (/home/user/.opt/dothereum/runtime)`

Caused by:
  process didn't exit successfully: `/home/user/.opt/dothereum/target/debug/build/dothereum-runtime-54902422e823ba8e/build-script-build` (exit code: 1)
--- stdout
Executing build command: "rustup" "run" "nightly" "cargo" "build" "--target=wasm32-unknown-unknown" "--manifest-path=/home/user/.opt/dothereum/target/debug/wbuild/dothereum-runtime/Cargo.toml"

--- stderr
    Blocking waiting for file lock on package cache
   Compiling wasm-build-runner-impl v1.0.0 (/home/user/.opt/dothereum/target/debug/wbuild-runner/dothereum-runtime)
    Finished dev [unoptimized + debuginfo] target(s) in 1.62s
     Running `/home/user/.opt/dothereum/target/debug/wbuild-runner/dothereum-runtime/target/debug/wasm-build-runner-impl`
   Compiling dothereum-runtime v0.2.2 (/home/user/.opt/dothereum/runtime)
error[E0277]: the trait bound `Event: core::convert::From<paint_evm::Event>` is not satisfied
   --> /home/user/.opt/dothereum/runtime/src/lib.rs:255:2
    |
251 | impl evm::Trait for Runtime {
    | --------------------------- in this `impl` item
...
255 |     type Event = Event;
    |     ^^^^^^^^^^^^^^^^^^^ the trait `core::convert::From<paint_evm::Event>` is not implemented for `Event`
    |
    = help: the following implementations were found:
              <Event as core::convert::From<paint_balances::RawEvent<substrate_primitives::crypto::AccountId32, u128, paint_balances::DefaultInstance>>>
              <Event as core::convert::From<paint_grandpa::Event>>
              <Event as core::convert::From<paint_indices::RawEvent<substrate_primitives::crypto::AccountId32, u32>>>
              <Event as core::convert::From<paint_sudo::RawEvent<substrate_primitives::crypto::AccountId32>>>
              <Event as core::convert::From<paint_system::Event>>

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.
error: could not compile `dothereum-runtime`.

To learn more, run the command again with --verbose.

paint_evm 模块在这里期望什么。这怎么能代替呢？

Answer 1

这里的错误具有误导性。这里真正的问题是您没有将 EVM 模块放入 construct_runtime! 宏中。

你需要添加这一行给你 construct_runtime! 定义：

EVM: evm::{Module, Call, Storage, Config, Event},

更详细地解释一下，construct_runtime! 宏将为每个 YOUR_MODULE 实现 core::convert::From<YOUR_MODULE::Event> 特征。因为您没有将模块包含到宏中，所以它不会生成特征实现，您会收到此处看到的错误。

这就是为什么您会看到错误消息向您建议所有其他已实现此特性的模块，只是因为它们已包含在您的 construct_runtime! 中。

添加此行后，您将越过此处显示的错误并找到与配置的其他部分相关的任何真实错误。

`paint_evm::Event` 没有为 `Event` 实现

`paint_evm::Event` is not implemented for `Event`

rust

ethereum

substrate

parity-io

evm