browser.rs 1.94 KB
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// Copyright 2019-2020 Parity Technologies (UK) Ltd.
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// This file is part of Substrate.

// Substrate is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Substrate is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.

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use log::info;
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use wasm_bindgen::prelude::*;
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use browser_utils::{
	Client,
	browser_configuration, set_console_error_panic_hook, init_console_log,
};
use std::str::FromStr;
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/// Starts the client.
#[wasm_bindgen]
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pub async fn start_client(chain_spec: String, log_level: String) -> Result<Client, JsValue> {
	start_inner(chain_spec, log_level)
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		.await
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		.map_err(|err| JsValue::from_str(&err.to_string()))
}

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async fn start_inner(chain_spec: String, log_level: String) -> Result<Client, Box<dyn std::error::Error>> {
	set_console_error_panic_hook();
	init_console_log(log_level.parse()?)?;
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	let chain_spec = service::PolkadotChainSpec::from_json_bytes(chain_spec.as_bytes().to_vec())
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		.map_err(|e| format!("{:?}", e))?;
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	let config = browser_configuration(chain_spec).await?;
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	info!("Polkadot browser node");
	info!("  version {}", config.full_version());
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	info!("  by Parity Technologies, 2017-2020");
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	info!("📋 Chain specification: {}", config.expect_chain_spec().name());
	info!("🏷 Node name: {}", config.name);
	info!("👤 Roles: {}", config.roles);
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	// Create the service. This is the most heavy initialization step.
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	let service = service::kusama_new_light(config)
		.map_err(|e| format!("{:?}", e))?;
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	Ok(browser_utils::start_client(service))
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}