mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-23 06:08:01 +00:00
James Wilson
d03e599684
* Allow metadata to be pulled directly from a node with runtime_metadata_url * Update docs * https too, and abstract out block_on fn * tweak a comment in the example
59 lines
1.7 KiB
Rust
59 lines
1.7 KiB
Rust
// Copyright 2019-2022 Parity Technologies (UK) Ltd.
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// This file is dual-licensed as Apache-2.0 or GPL-3.0.
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// see LICENSE for license details.
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use clap::Parser as ClapParser;
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use color_eyre::eyre;
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use frame_metadata::RuntimeMetadataPrefixed;
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use jsonrpsee::client_transport::ws::Uri;
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use scale::Decode;
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use std::io::{
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self,
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Write,
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};
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use subxt_codegen::utils::fetch_metadata_hex;
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/// Download metadata from a substrate node, for use with `subxt` codegen.
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#[derive(Debug, ClapParser)]
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pub struct Opts {
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/// The url of the substrate node to query for metadata.
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#[clap(
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name = "url",
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long,
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value_parser,
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default_value = "http://localhost:9933"
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)]
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url: Uri,
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/// The format of the metadata to display: `json`, `hex` or `bytes`.
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#[clap(long, short, default_value = "bytes")]
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format: String,
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}
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pub async fn run(opts: Opts) -> color_eyre::Result<()> {
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let hex_data = fetch_metadata_hex(&opts.url).await?;
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match opts.format.as_str() {
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"json" => {
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let bytes = hex::decode(hex_data.trim_start_matches("0x"))?;
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let metadata = <RuntimeMetadataPrefixed as Decode>::decode(&mut &bytes[..])?;
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let json = serde_json::to_string_pretty(&metadata)?;
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println!("{}", json);
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Ok(())
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}
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"hex" => {
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println!("{}", hex_data);
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Ok(())
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}
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"bytes" => {
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let bytes = hex::decode(hex_data.trim_start_matches("0x"))?;
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Ok(io::stdout().write_all(&bytes)?)
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}
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_ => {
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Err(eyre::eyre!(
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"Unsupported format `{}`, expected `json`, `hex` or `bytes`",
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opts.format
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))
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}
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}
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}
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