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Add a fee buffer to the transaction builder #315

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Feb 20, 2024
Merged

Add a fee buffer to the transaction builder #315

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8 changes: 8 additions & 0 deletions pycardano/txbuilder.py
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,9 @@ class TransactionBuilder:
execution_step_buffer: float = 0.2
"""Additional amount of execution step (in ratio) that will be added on top of estimation"""

fee_buffer: Optional[int] = field(default=None)
"""Additional amount of fee (in lovelace) that will be added on top of estimation."""

ttl: Optional[int] = field(default=None)

validity_start: Optional[int] = field(default=None)
Expand Down Expand Up @@ -544,6 +547,9 @@ def _merge_changes(changes):

# With changes included, we can estimate the fee more precisely
self.fee = self._estimate_fee()
# Beyond this, the computed fee is not updated anymore so we can add the fee buffer
if self.fee_buffer is not None:
self.fee += self.fee_buffer

if change_address:
self._outputs = original_outputs
Expand Down Expand Up @@ -872,6 +878,8 @@ def _estimate_fee(self):
plutus_execution_units.steps,
plutus_execution_units.mem,
)
if self.fee_buffer is not None:
estimated_fee += self.fee_buffer

return estimated_fee

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