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util.go
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util.go
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package protocol
import (
"fmt"
"github.com/onflow/flow-go/model/flow"
"github.com/onflow/flow-go/model/flow/filter"
)
// IsNodeStakedAt returns whether or not the node with the given ID is a valid
// staked, un-ejected node as of the given state snapshot.
func IsNodeStakedAt(snapshot Snapshot, id flow.Identifier) (bool, error) {
return CheckNodeStatusAt(
snapshot,
id,
filter.HasStake(true),
filter.Not(filter.Ejected),
)
}
// IsNodeStakedWithRoleAt returns whether or not the node with the given ID is a valid
// staked, un-ejected node with the specified role as of the given state snapshot.
func IsNodeStakedWithRoleAt(snapshot Snapshot, id flow.Identifier, role flow.Role) (bool, error) {
return CheckNodeStatusAt(
snapshot,
id,
filter.HasStake(true),
filter.Not(filter.Ejected),
filter.HasRole(role),
)
}
// CheckNodeStatusAt returns whether or not the node with the given ID is a valid identity at the given
// state snapshot, and satisfies all checks.
func CheckNodeStatusAt(snapshot Snapshot, id flow.Identifier, checks ...flow.IdentityFilter) (bool, error) {
identity, err := snapshot.Identity(id)
if IsIdentityNotFound(err) {
return false, nil
}
if err != nil {
return false, fmt.Errorf("could not retrieve node identity (id=%x): %w)", id, err)
}
for _, check := range checks {
if !check(identity) {
return false, nil
}
}
return true, nil
}