91 lines
2.2 KiB
Go
91 lines
2.2 KiB
Go
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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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type (
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// MetaHeader contains meta information of request.
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// It provides methods to get or set meta information
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// and reset meta header.
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MetaHeader interface {
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ResetMeta()
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// TTLRequest to verify and update ttl requests.
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GetTTL() uint32
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SetTTL(uint32)
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// EpochRequest gives possibility to get or set epoch in RPC Requests.
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GetEpoch() uint64
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SetEpoch(v uint64)
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}
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// TTLCondition is closure, that allows to validate request with ttl
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TTLCondition func(ttl uint32) error
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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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)
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const (
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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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// SetTTL sets TTL to RequestMetaHeader
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func (m *RequestMetaHeader) SetTTL(v uint32) { m.TTL = v }
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// SetEpoch sets Epoch to RequestMetaHeader
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func (m *RequestMetaHeader) SetEpoch(v uint64) { m.Epoch = v }
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// ResetMeta sets RequestMetaHeader to empty value
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func (m *RequestMetaHeader) ResetMeta() { m.Reset() }
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// IRNonForwarding condition that allows NonForwardingTTL only for IR
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func IRNonForwarding(role NodeRole) TTLCondition {
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return func(ttl uint32) error {
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if ttl == NonForwardingTTL && role != InnerRingNode {
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return ErrIncorrectTTL
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}
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return nil
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}
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}
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// ProcessRequestTTL validates and update ttl requests.
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func ProcessRequestTTL(req MetaHeader, cond ...TTLCondition) 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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}
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for i := range cond {
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if cond[i] == nil {
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continue
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}
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// check specific condition:
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if err := cond[i](ttl); err != nil {
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return status.New(codes.InvalidArgument, err.Error()).Err()
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}
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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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