我试图设置Cloudflare的工作人员来跟踪一些ERC20令牌的流通,作为学习web3和wasm的练习。本以为这可能很简单,但到目前为止,大约90%的时间都在试图解决这个难以捉摸的错误
A hanging Promise was canceled. This happens when the worker runtime is waiting for a Promise from JavaScript to resolve but has detected that the Promise cannot possibly ever resolve because all code and events related to the Promise's request context have already finished.
我在网上寻找额外的信息,但似乎我的错误是从不同的类型(?)。
下面是一个简单的代码片段。
mod erc20_abi;
use erc20_abi::ERC20_ABI;
use cfg_if::cfg_if;
use ethers::{
contract::Contract,
core::{abi::Abi, types::Address},
prelude::{AbiError, U256},
providers::{Http, Provider},
};
use num_format::{Locale, ToFormattedString};
use std::convert::TryFrom;
use wasm_bindgen::prelude::*;
cfg_if! {
// When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
// allocator.
if #[cfg(feature = "wee_alloc")] {
extern crate wee_alloc;
#[global_allocator]
static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
}
}
#[wasm_bindgen]
pub async fn handle() -> String {
let web3_ethereum = Provider::<Http>::try_from(WEB3_URL_ETHEREUM).unwrap();
let abi: Abi = serde_json::from_str(ERC20_ABI).unwrap();
let token_contract_ethereum = Contract::new(parse_address(ADDRESS_ETH),
abi, web3_ethereum);
let convert_wei_to_decimal = |bignumber: U256| -> String {
(bignumber.as_u128() / u128::pow(10, 18)).to_formatted_string(&Locale::en)
};
// I believe this is the problem, since just returning a String works fine.
let total_supply_ethereum = token_contract_ethereum
.method::<_, U256>("totalSupply", ())
.unwrap()
.call()
.await
.unwrap();
convert_wei_to_decimal(total_supply_ethereum)
}
fn parse_address(address: &str) -> Address {
address.parse::<Address>().unwrap()
}
这是worker/workers.js文件
addEventListener('fetch', (event) => {
event.respondWith(handleRequest(event.request))
})
const { handle } = wasm_bindgen;
const instance = wasm_bindgen(wasm);
/**
* Fetch and log a request
* @param {Request} request
*/
async function handleRequest(request) {
await instance;
const output = await handle();
let res = new Response(output, { status: 200 });
res.headers.set('Content-type', 'text/html');
return res;
}
Cargo.toml
[package]
name = "circulating-supply"
version = "0.1.0"
license = "GPL-3.0-or-later"
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[lib]
crate-type = ["cdylib", "rlib"]
[profile.release]
opt-level = 's' # Optimize for size.
lto = true
panic = "abort"
codegen-units = 1
[dependencies]
ethers = { git = "https://github.com/gakonst/ethers-rs" }
serde_json = "1.0.68"
num-format = "0.4.0"
cfg-if = "1.0.0"
wee_alloc = { version = "0.4.5", optional = true }
wasm-bindgen = "0.2.78"
wasm-bindgen-futures = "0.4.28"
js-sys = "0.3.55"
wrangler dev
可以很好地编译它,但是转到http://127.0.0.1:8787
将导致Error 1101
1条答案
按热度按时间c0vxltue1#
在我的例子中,一个依赖使用了wasm运行时中没有的东西。我猜ethers加密依赖也依赖于getrandom之类的东西。
将此添加到
Cargo.toml
解决了我的问题。这将强制您基于getrandom的依赖项使用getrandom的wasm特性。
如果你需要在0.2版中使用getrandom,可以使用: