Basic implementation of block-authoring logic.

Example

# use sc_basic_authorship::ProposerFactory;
# use sp_consensus::{Environment, Proposer, RecordProof};
# use sp_runtime::generic::BlockId;
# use std::{sync::Arc, time::Duration};
# use substrate_test_runtime_client::{self, runtime::{Extrinsic, Transfer}, AccountKeyring};
# use sc_transaction_pool::{BasicPool, FullChainApi};
# let client = Arc::new(substrate_test_runtime_client::new());
# let txpool = Arc::new(BasicPool::new(Default::default(), Arc::new(FullChainApi::new(client.clone())), None).0);
// The first step is to create a `ProposerFactory`.
let mut proposer_factory = ProposerFactory::new(client.clone(), txpool.clone());

// From this factory, we create a `Proposer`.
let proposer = proposer_factory.init(
&client.header(&BlockId::number(0)).unwrap().unwrap(),
);

// The proposer is created asynchronously.
let mut proposer = futures::executor::block_on(proposer).unwrap();

// This `Proposer` allows us to create a block proposition.
// The proposer will grab transactions from the transaction pool, and put them into the block.
let future = proposer.propose(
Default::default(),
Default::default(),
Duration::from_secs(2),
RecordProof::Yes,
);

// We wait until the proposition is performed.
let block = futures::executor::block_on(future).unwrap();
println!("Generated block: {:?}", block.block);