2019-02-20 10:21:57 -08:00
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# Messages
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TODO make this file conform to typical messages spec
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2018-12-05 16:48:08 -08:00
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## Handlers
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The auth module presently has no transaction handlers of its own, but does expose
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the special `AnteHandler`, used for performing basic validity checks on a transaction,
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such that it could be thrown out of the mempool. Note that the ante handler is called on
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`CheckTx`, but *also* on `DeliverTx`, as Tendermint proposers presently have the ability
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to include in their proposed block transactions which fail `CheckTx`.
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### Ante Handler
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```golang
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anteHandler(ak AccountKeeper, fck FeeCollectionKeeper, tx sdk.Tx)
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if !tx.(StdTx)
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fail with "not a StdTx"
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if isCheckTx and tx.Fee < config.SubjectiveMinimumFee
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fail with "insufficient fee for mempool inclusion"
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if tx.ValidateBasic() != nil
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fail with "tx failed ValidateBasic"
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if tx.Fee > 0
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account = GetAccount(tx.GetSigners()[0])
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coins := acount.GetCoins()
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if coins < tx.Fee
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fail with "insufficient fee to pay for transaction"
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account.SetCoins(coins - tx.Fee)
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fck.AddCollectedFees(tx.Fee)
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for index, signature in tx.GetSignatures()
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account = GetAccount(tx.GetSigners()[index])
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bytesToSign := StdSignBytes(chainID, acc.GetAccountNumber(),
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acc.GetSequence(), tx.Fee, tx.Msgs, tx.Memo)
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if !signature.Verify(bytesToSign)
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fail with "invalid signature"
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return
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```
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