45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
package service
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import (
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"github.com/nspcc-dev/neofs-proto/internal"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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)
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// TTLRequest to verify and update ttl requests.
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type TTLRequest interface {
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GetTTL() uint32
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SetTTL(uint32)
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}
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const (
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// ZeroTTL is empty ttl, should produce ErrZeroTTL.
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ZeroTTL = iota
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// NonForwardingTTL is a ttl that allows direct connections only.
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NonForwardingTTL
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// SingleForwardingTTL is a ttl that allows connections through another node.
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SingleForwardingTTL
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// ErrZeroTTL is raised when zero ttl is passed.
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ErrZeroTTL = internal.Error("zero ttl")
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// ErrIncorrectTTL is raised when NonForwardingTTL is passed and NodeRole != InnerRingNode.
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ErrIncorrectTTL = internal.Error("incorrect ttl")
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)
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// CheckTTLRequest validates and update ttl requests.
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func CheckTTLRequest(req TTLRequest, role NodeRole) error {
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var ttl = req.GetTTL()
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if ttl == ZeroTTL {
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return status.New(codes.InvalidArgument, ErrZeroTTL.Error()).Err()
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} else if ttl == NonForwardingTTL && role != InnerRingNode {
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return status.New(codes.InvalidArgument, ErrIncorrectTTL.Error()).Err()
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}
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req.SetTTL(ttl - 1)
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return nil
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}
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