Module subxt_core::blocks

Decode and iterate over the extrinsics in block bodies.

Use the decode_from function as an entry point to decoding extrinsics, and then have a look at Extrinsics and ExtrinsicDetails to see which methods are available to work with the extrinsics.

Example

extern crate alloc;

use subxt_macro::subxt;
use subxt_core::blocks;
use subxt_core::metadata;
use subxt_core::config::PolkadotConfig;
use alloc::vec;

// If we generate types without `subxt`, we need to point to `::subxt_core`:
#[subxt(
    crate = "::subxt_core",
    runtime_metadata_path = "../artifacts/polkadot_metadata_small.scale",
)]
pub mod polkadot {}

// Some metadata we'd like to use to help us decode extrinsics:
let metadata_bytes = include_bytes!("../../../artifacts/polkadot_metadata_small.scale");
let metadata = metadata::decode_from(&metadata_bytes[..]).unwrap();

// Some extrinsics we'd like to decode:
let ext_bytes = vec![
    hex::decode("280402000bf18367a38e01").unwrap(),
    hex::decode("c10184008eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a4801f4de97941fcc3f95c761cd58d480bb41ce64836850f51b6fcc7542e809eb0a346fe95eb1b72de542273d4f1b00b636eb025e2b0e98cc498a095e7ce48f3d4f82b501040000001848656c6c6f21").unwrap(),
    hex::decode("5102840090b5ab205c6974c9ea841be688864633dc9ca8a357843eeacf2314649965fe2201ac0c06f55cf3461067bbe48da16efbb50dfad555e2821ce20d37b2e42d6dcb439acd40f742b12ef00f8889944060b04373dc4d34a1992042fd269e8ec1e64a848502000004000090b5ab205c6974c9ea841be688864633dc9ca8a357843eeacf2314649965fe2217000010632d5ec76b05").unwrap()
];

// Given some chain config and metadata, we know how to decode the bytes.
let exts = blocks::decode_from::<PolkadotConfig>(ext_bytes, metadata).unwrap();

// We'll see 3 extrinsics:
assert_eq!(exts.len(), 3);

// We can iterate over them and decode various details out of them.
for ext in exts.iter() {
    let ext = ext.unwrap();
    println!("Pallet: {}", ext.pallet_name().unwrap());
    println!("Call:   {}", ext.variant_name().unwrap());
}

Structs

• ExtrinsicDetails
  A single extrinsic in a block.
• ExtrinsicMetadataDetails
  Details for the given extrinsic plucked from the metadata.
• ExtrinsicSignedExtension
  A single signed extension
• ExtrinsicSignedExtensions
  The signed extensions of an extrinsic.
• Extrinsics
  The body of a block.
• FoundExtrinsic
  A Static Extrinsic found in a block coupled with it’s details.
• SignedExtrinsicDetails
  Details only available in signed extrinsics.

Traits

• StaticExtrinsic
  Trait to uniquely identify the extrinsic’s identity from the runtime metadata.

Functions

• decode_from
  Instantiate a new Extrinsics object, given a vector containing each extrinsic hash (in the form of bytes) and some metadata that we’ll use to decode them.