如何用生锈墨水从另一个合同中调用现有的合同？

Question

我有两个非常基本的rust-ink dapp合同：

Dapp 1

#![cfg_attr(not(feature = "std"), no_std)]

use ink_lang as ink;
use dapp2;

#[ink::contract]
pub mod dapp1 {
    use dapp2::dapp2::Dapp2;

    #[ink(storage)]
    pub struct Dapp1 {
        dapp2_instance: Dapp2
    }

    impl Dapp1 {
        /// Get existing `Dapp2` contract at `address`
        #[ink(constructor)]
        pub fn new(address: AccountId) -> Self {
            let dapp2_instance: Dapp2 = ink_env::call::FromAccountId::from_account_id(address);
            Self {
                dapp2_instance
            }
        }

        /// Calls the Dapp2 contract.
        #[ink(message)]
        pub fn dapp2_do_something(&mut self) -> u8 {
            self.dapp2_instance.do_something()
        }
    }
}

Dapp 1将dapp2指定为toml中的依赖项。

dapp2 = { version = "3.0.0-rc7", path ="../dapp2", default-features = false, features = ["ink-as-dependency"] }

Dapp 2

#![cfg_attr(not(feature = "std"), no_std)]

use ink_lang as ink;

#[ink::contract]
pub mod dapp2 {
    #[ink(storage)]
    pub struct Dapp2 {
        pub what: u8,
    }

    impl Dapp2 {
        #[ink(constructor)]
        pub fn new() -> Self {
            let what = 2.into();
            Self {
                what
            }
        }

        #[ink(message)]
        pub fn do_something(&mut self) -> u8 {
            ink_env::debug_println!("{}", self.what);
            self.what
        }
    }
}

当我运行此构建时，dapp2编译，但是dapp1在

error[E0432]: unresolved import `dapp2`
 --> /home/usr/dev/dapp-example/dapp1/lib.rs:4:5
  |
4 | use dapp2;
  |     ^^^^^ no external crate `dapp2`

甚至我的IDE在点击时也能找到dapp2，那么这个导入样式有什么问题呢？

我还看到了其他例子(1、2、3.)，其中的合同只是简单地导入到模块中，但这似乎不适用于我。如果我这么做，我会得到：

7 |     use dapp2::Dapp2Ref;
  |         ^^^^^ use of undeclared crate or module `dapp2`

油墨设置为master分支。夜间生锈是最新的。版本是2021年。示例代码是论github

Answer 1

问题是在crate-type文件中没有将rlib设置为rlib。

crate-type = [
    # Used for normal contract Wasm blobs.
    "cdylib",
    # This was not set
    "rlib"
]

https://github.com/prosopo-io/dapp-example/blob/5b31491bfa02ccd9603c1ac91f0907c2c9b84856/dapp1/Cargo.toml#L25