Unable to define a custom URL

[kebab-mai-haddi]

I want to connect to a public network but while I do so using an API, it throws the error:

thread 'main' panicked at 'there is no reactor running, must be called from the context of a Tokio 1.x runtime', /Users/aviralsrivastava/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.14.0/src/runtime/context.rs:54:26
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

I set the URL and the port in a typical format in my code:

let api = ClientBuilder::new()
        .set_url("wss://pub.elara.patract.io:9944/statemine")
        .build()
        .await?
        .to_runtime_api::<polkadot::RuntimeApi<polkadot::DefaultConfig>>();

I tried to take a look at the source code for ClientBuilder:

let url = self.url.as_deref().unwrap_or("ws://127.0.0.1:9944");

The format is the same as in my code.

My MVC:

use subxt::ClientBuilder;

#[subxt::subxt(runtime_metadata_path = "polkadot_metadata.scale")]
pub mod polkadot {}

#[async_std::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    env_logger::init();

    let api = ClientBuilder::new()
        .set_url("wss://pub.elara.patract.io:9944/statemine")
        .build()
        .await?
        .to_runtime_api::<polkadot::RuntimeApi<polkadot::DefaultConfig>>();

    let mut iter = api.storage().system().account_iter(None).await?;

    while let Some((key, account)) = iter.next().await? {
        println!("{}: {}", hex::encode(key), account.data.free);
    }
    Ok(())
}

My Cargo.toml:

[package]
name = "my-package"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
subxt = { git = "https://github.com/paritytech/subxt/" }
async-std = {version = "1.10.0", features = ["attributes"]}
env_logger = "0.9.0"
async-trait = "0.1.49"
bitvec = { version = "0.20.1", default-features = false, features = ["alloc"] }
codec = { package = "parity-scale-codec", version = "2", default-features = false, features = ["derive", "full", "bit-vec"] }
chameleon = "0.1.0"
scale-info = { version = "1.0.0", features = ["bit-vec"] }
futures = "0.3.13"
hex = "0.4.3"
jsonrpsee = { version = "0.5.1", features = ["macros", "ws-client", "http-client"] }
log = "0.4.14"
num-traits = { version = "0.2.14", default-features = false }
serde = { version = "1.0.124", features = ["derive"] }
serde_json = "1.0.64"
thiserror = "1.0.24"
url = "2.2.1"

How do I configure my own URL to use the subxt library?

[niklasad1]

@kebab-mai-haddi

The URL is not the issue you have to use tokio 1.0 or async-std = { version = "1.9.0", features = ["attributes", "tokio1"] }

because the JSON-RPC client requires tokio 1.0 as runtime executor.

https://github.com/paritytech/subxt/blob/master/Cargo.toml#L46

[kebab-mai-haddi]

thanks!