73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
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package v3
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import (
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"encoding/binary"
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"errors"
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)
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const (
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datagramRequestIdLen = 16
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)
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var (
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// ErrInvalidRequestIDLen is returned when the provided request id can not be parsed from the provided byte slice.
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ErrInvalidRequestIDLen error = errors.New("invalid request id length provided")
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// ErrInvalidPayloadDestLen is returned when the provided destination byte slice cannot fit the whole request id.
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ErrInvalidPayloadDestLen error = errors.New("invalid payload size provided")
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)
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// RequestID is the request-id-v2 identifier, it is used to distinguish between specific flows or sessions proxied
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// from the edge to cloudflared.
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type RequestID uint128
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type uint128 struct {
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hi uint64
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lo uint64
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}
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// RequestIDFromSlice reads a request ID from a byte slice.
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func RequestIDFromSlice(data []byte) (RequestID, error) {
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if len(data) != datagramRequestIdLen {
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return RequestID{}, ErrInvalidRequestIDLen
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}
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return RequestID{
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hi: binary.BigEndian.Uint64(data[:8]),
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lo: binary.BigEndian.Uint64(data[8:]),
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}, nil
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}
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// Compare returns an integer comparing two IPs.
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// The result will be 0 if id == id2, -1 if id < id2, and +1 if id > id2.
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// The definition of "less than" is the same as the [RequestID.Less] method.
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func (id RequestID) Compare(id2 RequestID) int {
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hi1, hi2 := id.hi, id2.hi
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if hi1 < hi2 {
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return -1
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}
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if hi1 > hi2 {
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return 1
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}
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lo1, lo2 := id.lo, id2.lo
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if lo1 < lo2 {
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return -1
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}
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if lo1 > lo2 {
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return 1
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}
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return 0
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}
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// Less reports whether id sorts before id2.
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func (id RequestID) Less(id2 RequestID) bool { return id.Compare(id2) == -1 }
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// MarshalBinaryTo writes the id to the provided destination byte slice; the byte slice must be of at least size 16.
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func (id RequestID) MarshalBinaryTo(data []byte) error {
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if len(data) < datagramRequestIdLen {
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return ErrInvalidPayloadDestLen
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}
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binary.BigEndian.PutUint64(data[:8], id.hi)
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binary.BigEndian.PutUint64(data[8:], id.lo)
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return nil
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}
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