ZChains Whitepaper
  • Overview
  • Tokenomics
    • Glossary
    • Tokenomics
  • Get started
    • Installation
    • Local Setup
    • Cloud Setup
    • CLI Command
  • Additional Features
    • Explorer
    • Network stress testing
  • Architecture
    • Architecture Overview
    • Modules
      • Blockchain
      • Consensus
      • JSON RPC
      • Minimal
      • Networking
      • Other modules
      • Protocol
      • Sealer
      • State
      • Storage
      • TxPool
      • Types
  • Community
    • Propose a new feature
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  • Concepts
    • State in Ethereum
  • Configuration
    • Manage private keys
    • Server configuration file
    • Secret Managers
      • Set up AWS SSM (Systems Manager)
      • Set up GCP Secrets Manager
      • Set up Hashicorp Vault
  • Consensus
    • Proof of Stake
    • Set up and use Proof of Stake (PoS)
  • Working with node
    • Backup/restore node instance
    • Query JSON RPC endpoints
    • Query operator information
  • Development Roadmap
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  1. Architecture
  2. Modules

Sealer

Overview

The Sealer is an entity that gathers the transactions, and creates a new block. Then, that block is sent to the Consensus module to seal it.

The final sealing logic is located within the Consensus module.

Run Method

func (s *Sealer) run(ctx context.Context) {
	sub := s.blockchain.SubscribeEvents()
	eventCh := sub.GetEventCh()

	for {
		if s.config.DevMode {
			// In dev-mode we wait for new transactions to seal blocks
			select {
			case <-s.wakeCh:
			case <-ctx.Done():
				return
			}
		}

		// start sealing
		subCtx, cancel := context.WithCancel(ctx)
		done := s.sealAsync(subCtx)

		// wait for the sealing to be done
		select {
		case <-done:
			// the sealing process has finished
		case <-ctx.Done():
			// the sealing routine has been canceled
		case <-eventCh:
			// there is a new head, reset sealer
		}

		// cancel the sealing process context
		cancel()

		if ctx.Err() != nil {
			return
		}
	}
}

:::caution Work in progress The Sealer and the Consensus modules will be combined into a single entity in the near future.

The new module will incorporate modular logic for different kinds of consensus mechanisms, which require different sealing implementations:

  • PoS (Proof of Stake)

  • PoA (Proof of Authority)

Currently, the Sealer and the Consensus modules work with PoW (Proof of Work). :::

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Last updated 11 months ago