Overview

Consensus

Designed and implemented the validator module for validators consensus
- Designed the module architecture for supporting many consensus algorithms.(PoA, DPoA, DPoS, etc.)
- Implemented functions for checking status and proposing, agreeing, confirming, storing blocks
Implemented the PBFT consensus algorithm
- Implemented functions for creating & exchanging consensus messages(PrePrepare, Prepare, Commit, ViewChange)
- Implemented protocols and algorithms for consensus
Designed and implemented unit modules for delegating(voting) validator nodes
- Designed transaction formats and state stores for voting
- Implemented functions for registering, updating, agreeing, reading states

Changed the contract interface
Implemented Multi-Contract
- Change brach sepcifications
Added a provisional execution state for a contract
- Added block, transaction temporary execution
- Added block integrity verification
- Save changes to the contract results
Added a contract manager
- Add and delete local node contracts manage storage
- Added contract validation
- Added a contract ABI(JSON) call
Changed the method of calling the contract query method

Stabilized and verified the P2P network
Added a network filter to block malicious nodes
Changed peer-related terms
Improved node discovery
- Removed the dependency of node discovery and peerTable on nodes
  - Changed peerTable, dht, node, nodeStatus structure and dependency
- Implemented PeerTask for peer and channel management
  - 4 scheduler implementations
  - refresh (Kademlia lookup)
  - revalidate (verify the network status of peer from random peerbucket and replace or delete)
  - copyNode (only the peers that are kept longer than the minimum time is stored in the database)
  - healthCheck (channel management)
Improved logging
- A node monitoring system has been built
- ElasticSearch + Fluentd + Kibana