120 lines
3.8 KiB
Markdown
120 lines
3.8 KiB
Markdown
# Tendermint Socket Protocol (TMSP)
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Blockchains are a system for creating shared multi-master application state.
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**TMSP** is a socket protocol enabling a blockchain consensus engine, running in one process,
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to manage a blockchain application state, running in another.
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For more information on TMSP, motivations, and tutorials, please visit [our blog post](http://tendermint.com/posts/tendermint-socket-protocol/).
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## Message types
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TMSP requests/responses are simple Protobuf messages. Check out the [schema file](https://github.com/tendermint/tmsp/blob/master/types/types.proto).
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#### AppendTx
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* __Arguments__:
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* `Data ([]byte)`: The request transaction bytes
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* __Returns__:
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* `Code (uint32)`: Response code
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* `Data ([]byte)`: Result bytes, if any
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* `Log (string)`: Debug or error message
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* __Usage__:<br/>
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Append and run a transaction. If the transaction is valid, returns CodeType.OK
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#### CheckTx
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* __Arguments__:
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* `Data ([]byte)`: The request transaction bytes
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* __Returns__:
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* `Code (uint32)`: Response code
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* `Data ([]byte)`: Result bytes, if any
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* `Log (string)`: Debug or error message
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* __Usage__:<br/>
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Validate a transaction. This message should not mutate the state.
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Transactions are first run through CheckTx before broadcast to peers in the mempool layer.
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You can make CheckTx semi-stateful and clear the state upon `Commit` or `BeginBlock`,
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to allow for dependent sequences of transactions in the same block.
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#### Commit
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* __Returns__:
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* `Data ([]byte)`: The Merkle root hash
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* `Log (string)`: Debug or error message
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* __Usage__:<br/>
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Return a Merkle root hash of the application state.
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#### Query
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* __Arguments__:
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* `Data ([]byte)`: The query request bytes
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* __Returns__:
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* `Code (uint32)`: Response code
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* `Data ([]byte)`: The query response bytes
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* `Log (string)`: Debug or error message
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#### Flush
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* __Usage__:<br/>
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Flush the response queue. Applications that implement `types.Application` need not implement this message -- it's handled by the project.
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#### Info
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* __Returns__:
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* `Data ([]byte)`: The info bytes
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* __Usage__:<br/>
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Return information about the application state. Application specific.
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#### SetOption
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* __Arguments__:
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* `Key (string)`: Key to set
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* `Value (string)`: Value to set for key
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* __Returns__:
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* `Log (string)`: Debug or error message
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* __Usage__:<br/>
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Set application options. E.g. Key="mode", Value="mempool" for a mempool connection, or Key="mode", Value="consensus" for a consensus connection.
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Other options are application specific.
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#### InitChain
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* __Arguments__:
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* `Validators ([]Validator)`: Initial genesis validators
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* __Usage__:<br/>
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Called once upon genesis
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#### BeginBlock
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* __Arguments__:
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* `Height (uint64)`: The block height that is starting
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* __Usage__:<br/>
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Signals the beginning of a new block. Called prior to any AppendTxs.
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#### EndBlock
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* __Arguments__:
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* `Height (uint64)`: The block height that ended
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* __Returns__:
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* `Validators ([]Validator)`: Changed validators with new voting powers (0 to remove)
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* __Usage__:<br/>
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Signals the end of a block. Called prior to each Commit after all transactions
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### Changelog
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#### Mar 26h, 2016
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* Introduce BeginBlock
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#### Mar 6th, 2016
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* Added InitChain, EndBlock
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#### Feb 14th, 2016
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* s/GetHash/Commit/g
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* Document Protobuf request/response fields
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#### Jan 23th, 2016
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* Added CheckTx/Query TMSP message types
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* Added Result/Log fields to AppendTx/CheckTx/SetOption
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* Removed Listener messages
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* Removed Code from ResponseSetOption and ResponseGetHash
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* Made examples BigEndian
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#### Jan 12th, 2016
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* Added "RetCodeBadNonce = 0x06" return code
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#### Jan 8th, 2016
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* Tendermint/TMSP now comes to consensus on the order first before AppendTx.
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