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extrinsics: Decode extrinsics from blocks (#929)
* Update polkadot.scale Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * extrinsics: Add extrinsics client Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * extrinsics: Decode extrinsics Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * subxt: Add extrinsic error Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * blocks: Expose extrinsics Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * examples: Fetch and decode block extrinsics Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Fix clippy Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * extrinsics: Fetch pallet and variant index Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * subxt: Move extrinsics on the subxt::blocks Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * example: Adjust example Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * metadata: Collect ExtrinsicMetadata Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * subxt: Implement StaticExtrinsic for the calls Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust examples Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * codegen: Add root level Call enum Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust testing Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * subxt: Add new decode interface Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * subxt: Merge ExtrinsicError with BlockError Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * examples: Find first extrinsic Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Move code to extrinsic_types Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Add Extrinsic struct Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust examples Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * test: Decode extinsics Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * extrinsics/test: Add fake metadata for static decoding Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * extrinsics/test: Decode from insufficient bytes Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * extrinsics/test: Check unsupported versions Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * extrinsics/test: Statically decode to root and pallet enums Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * extrinsics/tests: Remove clones Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * blocks: Fetch block body inline Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * blocks: Rename ExtrinsicIds to ExtrinsicPartTypeIds Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * extrinsics/test: Check decode as_extrinsic Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * blocks: Remove InsufficientData error Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * blocks: Return error from extrinsic_metadata Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * extrinsics: Postpone decoding of call bytes Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * metadata_type: Rename variables Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust calls path for example and tests Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * examples: Remove traces Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * book: Add extrinsics documentation Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * book: Improve extrinsics docs Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> --------- Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> Co-authored-by: James Wilson <james@jsdw.me>
This commit is contained in:
Alexandru Vasile
@@ -0,0 +1,99 @@
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// Copyright 2019-2023 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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//! To run this example, a local polkadot node should be running. Example verified against polkadot v0.9.28-9ffe6e9e3da.
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//!
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//! E.g.
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//! ```bash
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//! curl "https://github.com/paritytech/polkadot/releases/download/v0.9.28/polkadot" --output /usr/local/bin/polkadot --location
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//! polkadot --dev --tmp
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//! ```
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use futures::StreamExt;
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use sp_keyring::AccountKeyring;
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use std::time::Duration;
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use subxt::{tx::PairSigner, OnlineClient, PolkadotConfig};
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#[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata.scale")]
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pub mod polkadot {}
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/// Subscribe to all events, and then manually look through them and
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/// pluck out the events that we care about.
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#[tokio::main]
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async fn main() -> Result<(), Box<dyn std::error::Error>> {
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// Create a client to use:
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let api = OnlineClient::<PolkadotConfig>::new().await?;
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// Subscribe to (in this case, finalized) blocks.
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let mut block_sub = api.blocks().subscribe_finalized().await?;
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// While this subscription is active, balance transfers are made somewhere:
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tokio::task::spawn({
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let api = api.clone();
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async move {
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let signer = PairSigner::new(AccountKeyring::Alice.pair());
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let mut transfer_amount = 1_000_000_000;
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// Make small balance transfers from Alice to Bob in a loop:
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loop {
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let transfer_tx = polkadot::tx()
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.balances()
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.transfer(AccountKeyring::Bob.to_account_id().into(), transfer_amount);
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api.tx()
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.sign_and_submit_default(&transfer_tx, &signer)
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.await
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.unwrap();
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tokio::time::sleep(Duration::from_secs(10)).await;
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transfer_amount += 100_000_000;
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}
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}
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});
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// Get each finalized block as it arrives.
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while let Some(block) = block_sub.next().await {
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let block = block?;
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let block_hash = block.hash();
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println!(" Block {:?}", block_hash);
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// Ask for the extrinsics for this block.
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let extrinsics = block.body().await?.extrinsics();
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let transfer_tx = extrinsics.find_first::<polkadot::balances::calls::types::Transfer>();
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println!(" Transfer tx: {:?}", transfer_tx);
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// Ask for the extrinsics for this block.
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for extrinsic in extrinsics.iter() {
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let extrinsic = extrinsic?;
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println!(
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" Extrinsic block index {:?}, pallet index {:?}, variant index {:?}",
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extrinsic.index(),
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extrinsic.pallet_index(),
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extrinsic.variant_index()
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);
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let root_extrinsic = extrinsic.as_root_extrinsic::<polkadot::Call>();
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println!(" As root extrinsic {:?}\n", root_extrinsic);
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let pallet_extrinsic = extrinsic
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.as_pallet_extrinsic::<polkadot::runtime_types::pallet_balances::pallet::Call>();
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println!(
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" Extrinsic as Balances Pallet call: {:?}\n",
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pallet_extrinsic
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);
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let call = extrinsic.as_extrinsic::<polkadot::balances::calls::types::Transfer>()?;
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println!(
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" Extrinsic as polkadot::balances::calls::Transfer: {:?}\n\n",
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call
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);
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}
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println!("\n");
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}
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Ok(())
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}
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@@ -25,7 +25,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
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// Log each of the extrinsic with it's associated events:
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let body = block.body().await?;
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for ext in body.extrinsics() {
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for ext in body.extrinsics().iter() {
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let ext = ext?;
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let idx = ext.index();
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let events = ext.events().await?;
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let bytes_hex = format!("0x{}", hex::encode(ext.bytes()));
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