一個協議，支持任何語言的交易處理實現

1. 應用層實現交互的接口

// Application is an interface that enables any finite, deterministic state machine // to be driven by a blockchain-based replication engine via the ABCI. // All methods take a RequestXxx argument and return a ResponseXxx argument, // except CheckTx/DeliverTx, which take `tx []byte`, and `Commit`, which takes nothing. type Application interface {// Info/Query ConnectionInfo(RequestInfo) ResponseInfo // Return application infoQuery(RequestQuery) ResponseQuery // Query for state// Mempool ConnectionCheckTx(RequestCheckTx) ResponseCheckTx // Validate a tx for the mempool// Consensus ConnectionInitChain(RequestInitChain) ResponseInitChain // Initialize blockchain w validators/other info from TendermintCoreBeginBlock(RequestBeginBlock) ResponseBeginBlock // Signals the beginning of a blockDeliverTx(RequestDeliverTx) ResponseDeliverTx // Deliver a tx for full processingEndBlock(RequestEndBlock) ResponseEndBlock // Signals the end of a block, returns changes to the validator setCommit() ResponseCommit // Commit the state and return the application Merkle root hash// State Sync ConnectionListSnapshots(RequestListSnapshots) ResponseListSnapshots // List available snapshotsOfferSnapshot(RequestOfferSnapshot) ResponseOfferSnapshot // Offer a snapshot to the applicationLoadSnapshotChunk(RequestLoadSnapshotChunk) ResponseLoadSnapshotChunk // Load a snapshot chunkApplySnapshotChunk(RequestApplySnapshotChunk) ResponseApplySnapshotChunk // Apply a shapshot chunk }

• Consensus Connection: InitChain, BeginBlock, DeliverTx, EndBlock,

• CommitMempool Connection: CheckTxInfo

• Connection: Info, SetOption, Query

proto定義位于 https://github.com/tendermint/abci/blob/master/types/types.proto

2. 一個應用程序可以有3個 ABCI 套接字連接

對應3個消息：

• CheckTx消息
  在內存池中廣播時驗證交易，用于驗證交易。Tendermint Core中的mempool通過此消息校驗交易的合法性，通過之后才會將交易廣播給其它節點。
• DeliverTx消息
  應用的主要工作流程，通過此消息真正執行交易，包括驗證交易、更新應用程序的狀態。
• Commit消息
  通知應用程序計算當前的世界狀態，并存在下一區塊頭中
  

總結

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