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236 lines
7.4 KiB
236 lines
7.4 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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- **Arguments**:
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- ``Version (string)``: The Tendermint version
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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**:
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- Return information about the application state.
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- Used to 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)``: The output of the application's logger. May be non-deterministic.
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- ``Info (string)``: Additional information. May be non-deterministic.
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- **Usage**:
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- Set non-consensus critical application specific options.
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- e.g. Key="min-fee", Value="100fermion" could set the minimum fee required for CheckTx
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(but not DeliverTx - that would be consensus critical).
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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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- ``AppStateBytes ([]byte)``: Serialized initial application state
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- **Usage**:
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- 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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- ``Log (string)``: The output of the application's logger. May be non-deterministic.
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- ``Info (string)``: Additional information. May be non-deterministic.
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- ``Index (int64)``: The index of the key in the tree.
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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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- **Usage**:
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- Query for data from the application at current or past height.
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- Optionally return Merkle proof.
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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**:
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- Signals the beginning of a new block. Called prior to any DeliverTxs.
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- 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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- ``Tx ([]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)``: The output of the application's logger. May be non-deterministic.
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- ``Info (string)``: Additional information. May be non-deterministic.
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- ``GasWanted (int64)``: Amount of gas consumed by transaction.
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- ``Tags ([]cmn.KVPair)``: Key-Value tags for filtering and indexing transactions (eg. by account).
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- ``Fee ([]cmn.KI64Pair)``: Fee paid for the 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``, to allow for dependent sequences of transactions
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in the same block.
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DeliverTx
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^^^^^^^^^
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- **Arguments**:
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- ``Tx ([]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)``: The output of the application's logger. May be non-deterministic.
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- ``Info (string)``: Additional information. May be non-deterministic.
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- ``GasWanted (int64)``: Amount of gas predicted to be consumed by transaction.
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- ``GasUsed (int64)``: Amount of gas consumed by transaction.
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- ``Tags ([]cmn.KVPair)``: Key-Value tags for filtering and indexing transactions (eg. by account).
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- **Usage**:
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- Deliver a transaction to be executed in full by the application. 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)``: Height of the block just executed.
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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, and other parameters.
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- **Usage**:
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- Signals the end of a block.
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- Called prior to each Commit, after all transactions.
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- Validator set and consensus params are 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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- **Usage**:
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- Persist the application state.
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- Return a Merkle root hash of the application state.
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