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InitiateBridgeTransfer is the canonical user-tx admission point on B-Chain — it drives MPC signing capacity. Add a Fee uint64 field to BridgeMessage and attach a FlatPolicy at MinTxFeeFloor in Initialize. The fee gate refuses zero-fee transfers before any MPC signing capacity is consumed. Consensus-internal callers bypass via pendingBridges / bridgeSigner direct access.
41 lines
1.3 KiB
Go
41 lines
1.3 KiB
Go
// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
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// See the file LICENSE for licensing terms.
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package bridgevm
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import (
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"fmt"
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"github.com/luxfi/constants"
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"github.com/luxfi/node/vms/types/fee"
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)
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// newFeePolicy returns the canonical B-Chain FeePolicy. B-Chain accepts
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// user-submitted bridge transfers (InitiateBridgeTransfer) that drive
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// MPC signing capacity, so it MUST charge a non-zero floor; see
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// vms/types/fee/policy.go.
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func newFeePolicy(networkID uint32) fee.Policy {
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return fee.FlatPolicy{
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Fee: fee.MinTxFeeFloor,
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AssetID: constants.UTXOAssetIDFor(networkID),
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}
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}
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// gateUserBridgeMessage refuses messages whose declared Fee does not
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// satisfy the configured FeePolicy. Called from InitiateBridgeTransfer
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// before any MPC signing capacity is consumed.
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//
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// Internal callers (consensus engine replay) bypass the gate by
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// reaching pendingBridges/bridgeSigner directly.
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func (vm *VM) gateUserBridgeMessage(message *BridgeMessage) error {
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if vm.feePolicy == nil {
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return fmt.Errorf("bridgevm: fee policy not initialized")
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}
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asset := constants.UTXOAssetIDFor(vm.networkID)
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return vm.feePolicy.ValidateFee(message.Fee, asset)
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}
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// FeePolicy exposes the chain's declared fee policy for diagnostics
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// and the boot-time Validate gate.
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func (vm *VM) FeePolicy() fee.Policy { return vm.feePolicy }
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