我的目标是使用substrate-api-client在 Substrate 的存储映射中写入一个值。我在 Substrate 链中定义的存储映射如下所示：
use frame_support::{decl_module, decl_storage, dispatch::result::Result, ensure, StorageMap};
use frame_system::ensure_signed;
use sp_runtime::DispatchError;
// pub trait Trait: balances::Trait {}
pub trait Trait: pallet_balances::Trait {}
decl_storage! {
trait Store for Module<T: Trait> as KittyStorage {
// Value: map T::Hash => Option<T::AccountId>;
// TODO: check whether this is the appropriate datatype(hash).
Value: map hasher(blake2_256) T::Hash => Option<T::AccountId>;
// Balances: map hasher(blake2_256) (T::AssetId, T::AccountId) => T::Balance;
}
}
decl_module! {
pub struct Module<T: Trait> for enum Call where origin: T::Origin {
fn set_value(origin, value: T::Hash) -> Result<(), DispatchError> {
let sender = ensure_signed(origin)?;
ensure!(!<Value<T>>::contains_key(value), "key already exists");
<Value<T>>::insert(value, sender);
Ok(())
}
}
}
上述存储图位于：
substrate/bin/node/runtime/src/substratekitties.rs
预期的结果是成功地在 Substrate 的存储上写入一个值。正如我在前端所做的那样，成功：
但是，在使用substrate-api-client来执行相同的任务时，我收到以下错误：
[2020-04-03T05:14:12Z ERROR substrate_api_client::rpc::client] ERROR: Object({"code": Number(1010), "data": String("BadProof"), "message": String("Invalid Transaction")})
我试图在substrate-api-client. 这就是我编写外在的方式：
let xt = compose_extrinsic!(
api.clone(),
"Substratekitties",
"set_value",
"0x0000000000000000000000000000000000000000000000000000000000000002"
);
这是重现错误所需的最少代码：
/*
Copyright 2019 Supercomputing Systems AG
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
//! This examples shows how to use the compose_extrinsic macro to create an extrinsic for any (custom)
//! module, whereas the desired module and call are supplied as a string.
use clap::{load_yaml, App};
use keyring::AccountKeyring;
use sp_core::crypto::Pair;
// use substrate_api_client::extrinsic::xt_primitives::UncheckedExtrinsicV4;
use substrate_api_client::{
compose_extrinsic, extrinsic::xt_primitives::UncheckedExtrinsicV4, Api,
};
// use crate::{compose_extrinsic, Api};
fn main() {
env_logger::init();
let url = get_node_url_from_cli();
// initialize api and set the signer (sender) that is used to sign the extrinsics
let from = AccountKeyring::Alice.pair();
let mut api = Api::new(format!("ws://{}", url)).set_signer(from);
// let signer = AccountKeyring::Alice.pair();
// api.signer = Some(signer);
// the names are given as strings
let xt = compose_extrinsic!(
api.clone(),
"Substratekitties",
"set_value",
"0x0000000000000000000000000000000000000000000000000000000000000002"
);
println!("[+] Composed Extrinsic:\n {:?}\n", xt);
// send and watch extrinsic until finalized
let signer = AccountKeyring::Alice.pair();
api.signer = Some(signer);
let tx_hash = api.send_extrinsic(xt.hex_encode()).unwrap();
println!("[+] Transaction got finalized. Hash: {:?}", tx_hash);
}
pub fn get_node_url_from_cli() -> String {
let yml = load_yaml!("../../src/examples/cli.yml");
let matches = App::from_yaml(yml).get_matches();
let node_ip = matches.value_of("node-server").unwrap_or("127.0.0.1");
let node_port = matches.value_of("node-port").unwrap_or("9944");
let url = format!("{}:{}", node_ip, node_port);
println!("Interacting with node on {}\n", url);
url
}
上面的代码位于文件中：example_writing_file_hash.rs树是：
substrate-api-client/src/examples/example_writing_file_hash.rs
而完整的代码库可在此处获得。
更新 1
根据user13207835的回答，我尝试将我的内容声明为哈希但失败了。PS我是Rust，Substrate的初学者。
let file_hash: Hash = "0x0000000000000000000000000000000000000000000000000000000000000002";
得到错误：
error[E0308]: mismatched types; expected struct `primitive_types::H256`, found `&str`
我理解这个错误，但我不知道如何按照Hash答案中的建议声明上述值。