Tezos_raw_protocol_alpha.Mempool_validationThis module implements a mempool structure meant to be used by a shell and bakers in order to incrementally accumulate commutative operations which could then be safely used to bake a new block. These mempool components guarantee a set of properties useful for these purposes:
Mempools do not depend on local data and therefore are serializable. This is useful when a node needs to send a mempool to another (remote-)process (e.g. the baker).
type conflict_handler =
existing_operation:
(Tezos_protocol_environment_alpha.Operation_hash.t
* Alpha_context.packed_operation) ->
new_operation:
(Tezos_protocol_environment_alpha.Operation_hash.t
* Alpha_context.packed_operation) ->
[ `Keep | `Replace ]Type of the function that may be provided in order to resolve a potential conflict when adding an operation to an existing mempool or when merging two mempools. This handler may be defined as a simple order relation over operations (e.g. prioritize the most profitable operations) or an arbitrary one (e.g. prioritize operations where the source is a specific manager).
Returning `Keep will leave the mempool unchanged and retain the existing_operation while returning `Replace will remove existing_operation and add new_operation instead.
type add_result = | AddedAdded means that an operation was successfully added to the mempool without any conflict.
| Replaced of {}Replaced {removed} means that an operation was successfully added but there was a conflict with the removed operation which was removed from the mempool.
| UnchangedUnchanged means that there was a conflict with an existing operation which was considered better by the conflict_handler, therefore the new operation is discarded and the mempool remains unchanged.
Return type when adding an operation to the mempool
type operation_conflict = Validate_errors.operation_conflict = | Operation_conflict of {existing : Tezos_protocol_environment_alpha.Operation_hash.t;new_operation : Tezos_protocol_environment_alpha.Operation_hash.t;}type add_error = | Validation_error of Tezos_protocol_environment_alpha.Error_monad.error
Tezos_protocol_environment_alpha.Error_monad.traceValidation_error _ means that the operation is invalid.
| Add_conflict of operation_conflictAdd_conflict _ means that an operation conflicts with an existing one. This error will only be obtained when no conflict_handler was provided. Moreover, Validation_error _ takes precedence over Add_conflict _ which implies that we have the implicit invariant that the operation would be valid if there was no conflict. Therefore, if add_operation would have to be called again, it would be redondant to check the operation's signature.
Error type returned when adding an operation to the mempool fails.
type merge_error = | Incompatible_mempoolIncompatible_mempool _ means that the two mempools are not built ontop of the same head and therefore cannot be considered.
| Merge_conflict of operation_conflictMerge_conflict _ arises when two mempools contain conflicting operations and no conflict_handler was provided.
Error type returned when the merge of two mempools fails.
val encoding : t Tezos_protocol_environment_alpha.Data_encoding.tMempool encoding
val init :
Alpha_context.context ->
Tezos_protocol_environment_alpha.Chain_id.t ->
predecessor_level:Alpha_context.Level.t ->
predecessor_round:Alpha_context.Round.t ->
predecessor_hash:Tezos_protocol_environment_alpha.Block_hash.t ->
validation_info * tInitialize a static validation_info and mempool, required to validate and add operations, and an incremental and serializable mempool.
val add_operation :
?check_signature:bool ->
?conflict_handler:conflict_handler ->
validation_info ->
t ->
(Tezos_protocol_environment_alpha.Operation_hash.t
* Alpha_context.packed_operation) ->
(t * add_result, add_error)
Tezos_protocol_environment_alpha.Pervasives.result
Tezos_protocol_environment_alpha.Lwt.tAdds an operation to a mempool if and only if it is valid and does not conflict with previously added operations.
This function checks the validity of an operation (see Validate.check_operation) and tries to add it to the mempool.
If an error occurs during the validation, the result will be a Validation_error <err>. If a conflict with a previous operation exists, the result will be an Add_conflict (see Validate.check_operation_conflict). Important: no Add_conflict will be raised if a conflict_handler is provided (see add_result).
If no error is raised the operation is potentially added to the mempool depending on the add_result value.
val remove_operation :
t ->
Tezos_protocol_environment_alpha.Operation_hash.t ->
tremove_operation mempool oph removes the operation oph from the mempool. The mempool remains unchanged when oph is not present in the mempool
val merge :
?conflict_handler:conflict_handler ->
t ->
t ->
(t, merge_error) Tezos_protocol_environment_alpha.Pervasives.resultmerge ?conflict_handler existing_mempool new_mempool merges new_mempool into existing_mempool.
Mempools may only be merged if they are compatible: i.e. both have been initialised with the same predecessor block. Otherwise, the Incompatible_mempool error is returned.
Conflicts between operations from the two mempools can occur. Similarly as add_operation, a Merge_conflict error may be raised when no conflict_handler is provided.
existing_operation in conflict_handler ~existing_operation ~new_operation references operations present in existing_mempool while new_operation will reference operations present in new_mempool.
val operations :
t ->
Alpha_context.packed_operation
Tezos_protocol_environment_alpha.Operation_hash.Map.toperations mempool returns the map of operations present in mempool.