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transactionAccountFrozen.go
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transactionAccountFrozen.go
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package fvm
import (
"fmt"
"github.com/onflow/flow-go/fvm/programs"
"github.com/onflow/flow-go/fvm/state"
"github.com/onflow/flow-go/model/flow"
"github.com/onflow/flow-go/module/trace"
)
type TransactionAccountFrozenChecker struct{}
func NewTransactionAccountFrozenChecker() *TransactionAccountFrozenChecker {
return &TransactionAccountFrozenChecker{}
}
func (c *TransactionAccountFrozenChecker) Process(
_ *VirtualMachine,
_ *Context,
proc *TransactionProcedure,
sth *state.StateHolder,
_ *programs.Programs,
) error {
var err error
sth.DisableLimitEnforcement()
err = c.checkAccountNotFrozen(proc.Transaction, sth)
sth.EnableLimitEnforcement()
return err
}
func (c *TransactionAccountFrozenChecker) checkAccountNotFrozen(
tx *flow.TransactionBody,
sth *state.StateHolder,
) error {
accounts := state.NewAccounts(sth)
for _, authorizer := range tx.Authorizers {
err := accounts.CheckAccountNotFrozen(authorizer)
if err != nil {
return fmt.Errorf("checking frozen account failed: %w", err)
}
}
err := accounts.CheckAccountNotFrozen(tx.ProposalKey.Address)
if err != nil {
return fmt.Errorf("checking frozen account failed: %w", err)
}
err = accounts.CheckAccountNotFrozen(tx.Payer)
if err != nil {
return fmt.Errorf("checking frozen account failed: %w", err)
}
return nil
}
type TransactionAccountFrozenEnabler struct{}
func NewTransactionAccountFrozenEnabler() *TransactionAccountFrozenEnabler {
return &TransactionAccountFrozenEnabler{}
}
func (c *TransactionAccountFrozenEnabler) Process(
_ *VirtualMachine,
ctx *Context,
proc *TransactionProcedure,
_ *state.StateHolder,
_ *programs.Programs,
) error {
if ctx.Tracer != nil && proc.TraceSpan != nil {
span := ctx.Tracer.StartSpanFromParent(proc.TraceSpan, trace.FVMFrozenAccountCheckTransaction)
defer span.Finish()
}
serviceAddress := ctx.Chain.ServiceAddress()
for _, signature := range proc.Transaction.EnvelopeSignatures {
if signature.Address == serviceAddress {
ctx.AccountFreezeAvailable = true
return nil // we can bail out and save maybe some loops
}
}
return nil
}