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204 lines
6.2 KiB
204 lines
6.2 KiB
Specification
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=============
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Message Types
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~~~~~~~~~~~~~
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ABCI requests/responses are defined as simple Protobuf messages in `this
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schema
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file <https://github.com/tendermint/abci/blob/master/types/types.proto>`__.
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TendermintCore sends the requests, and the ABCI application sends the
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responses. Here, we describe the requests and responses as function
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arguments and return values, and make some notes about usage:
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Echo
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^^^^
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- **Arguments**:
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- ``Message (string)``: A string to echo back
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- **Returns**:
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- ``Message (string)``: The input string
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- **Usage**:
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- Echo a string to test an abci client/server implementation
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Flush
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^^^^^
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- **Usage**:
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- Signals that messages queued on the client should be flushed to
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the server. It is called periodically by the client implementation
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to ensure asynchronous requests are actually sent, and is called
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immediately to make a synchronous request, which returns when the
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Flush response comes back.
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Info
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^^^^
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- **Returns**:
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- ``Data (string)``: Some arbitrary information
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- ``Version (Version)``: Version information
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- ``LastBlockHeight (int64)``: Latest block for which the app has
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called Commit
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- ``LastBlockAppHash ([]byte)``: Latest result of Commit
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- **Usage**: Return information about the application state. Used to
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sync the app with Tendermint on crash/restart.
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SetOption
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^^^^^^^^^
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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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- ``Code (uint32)``: Response code
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- ``Log (string)``: Debug or error message
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- **Usage**: Set application options. E.g. Key="mode", Value="mempool"
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for a mempool connection, or Key="mode", Value="consensus" for a
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consensus connection. Other options are application specific.
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InitChain
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^^^^^^^^^
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- **Arguments**:
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- ``Validators ([]Validator)``: Initial genesis validators
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- **Usage**: Called once upon genesis
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Query
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^^^^^
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- **Arguments**:
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- ``Data ([]byte)``: Raw query bytes. Can be used with or in lieu of
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Path.
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- ``Path (string)``: Path of request, like an HTTP GET path. Can be
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used with or in liue of Data.
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- Apps MUST interpret '/store' as a query by key on the underlying
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store. The key SHOULD be specified in the Data field.
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- Apps SHOULD allow queries over specific types like '/accounts/...'
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or '/votes/...'
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- ``Height (int64)``: The block height for which you want the query
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(default=0 returns data for the latest committed block). Note that
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this is the height of the block containing the application's
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Merkle root hash, which represents the state as it was after
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committing the block at Height-1
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- ``Prove (bool)``: Return Merkle proof with response if possible
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- **Returns**:
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- ``Code (uint32)``: Response code
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- ``Key ([]byte)``: The key of the matching data
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- ``Value ([]byte)``: The value of the matching data
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- ``Proof ([]byte)``: Proof for the data, if requested
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- ``Height (int64)``: The block height from which data was derived.
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Note that this is the height of the block containing the
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application's Merkle root hash, which represents the state as it
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was after committing the block at Height-1
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- ``Log (string)``: Debug or error message
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BeginBlock
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^^^^^^^^^^
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- **Arguments**:
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- ``Hash ([]byte)``: The block's hash. This can be derived from the
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block header.
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- ``Header (struct{})``: The block header
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- ``AbsentValidators ([]int32)``: List of indices of validators not
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included in the LastCommit
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- ``ByzantineValidators ([]Evidence)``: List of evidence of
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validators that acted maliciously
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- **Usage**: Signals the beginning of a new block. Called prior to any
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DeliverTxs. The header is expected to at least contain the Height.
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The ``AbsentValidators`` and ``ByzantineValidators`` can be used to
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determine rewards and punishments for the validators.
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CheckTx
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^^^^^^^
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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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- ``Gas (int64)``: Amount of gas consumed by transaction
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- ``Fee (int64)``: Fee paid by transaction
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- **Usage**: Validate a mempool transaction, prior to broadcasting or
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proposing. This message should not mutate the main state, but
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application developers may want to keep a separate CheckTx state that
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gets reset upon Commit.
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CheckTx can happen interspersed with DeliverTx, but they happen on
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different ABCI connections - CheckTx from the mempool connection, and
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DeliverTx from the consensus connection. During Commit, the mempool
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is locked, so you can reset the mempool state to the latest state
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after running all those DeliverTxs, and then the mempool will re-run
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whatever txs it has against that latest mempool state.
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Transactions are first run through CheckTx before broadcast to peers
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in the mempool layer. You can make CheckTx semi-stateful and clear
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the state upon ``Commit`` or ``BeginBlock``, to allow for dependent
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sequences of transactions in the same block.
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DeliverTx
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^^^^^^^^^
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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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- ``Tags ([]*KVPair)``: Optional tags for indexing
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- **Usage**: Append and run a transaction. If the transaction is valid,
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returns CodeType.OK
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EndBlock
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^^^^^^^^
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- **Arguments**:
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- ``Height (int64)``: The block height that ended
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- **Returns**:
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- ``ValidatorUpdates ([]Validator)``: Changes to validator set (set
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voting power to 0 to remove)
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- ``ConsensusParamUpdates (ConsensusParams)``: Changes to
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consensus-critical time/size parameters
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- **Usage**: Signals the end of a block. Called prior to each Commit
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after all transactions. Validator set is updated with the result.
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Commit
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^^^^^^
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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**: Return a Merkle root hash of the application state.
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