62 lines
1.5 KiB
Go
62 lines
1.5 KiB
Go
package payload
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import (
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"errors"
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"fmt"
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"github.com/nspcc-dev/neo-go/pkg/core/block"
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"github.com/nspcc-dev/neo-go/pkg/io"
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)
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// Headers payload.
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type Headers struct {
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Hdrs []*block.Header
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// StateRootInHeader specifies whether the header contains a state root.
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StateRootInHeader bool
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}
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// Users can at most request 2k headers.
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const (
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MaxHeadersAllowed = 2000
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)
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// ErrTooManyHeaders is an error returned when too many headers have been received.
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var ErrTooManyHeaders = fmt.Errorf("too many headers were received (max: %d)", MaxHeadersAllowed)
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// ErrNoHeaders is returned for zero-elements Headers payload which is considered to be invalid.
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var ErrNoHeaders = errors.New("no headers (zero length array)")
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// DecodeBinary implements the Serializable interface.
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func (p *Headers) DecodeBinary(br *io.BinReader) {
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lenHeaders := br.ReadVarUint()
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if br.Err == nil && lenHeaders == 0 {
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br.Err = ErrNoHeaders
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return
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}
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var limitExceeded bool
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// C# node does it silently
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if limitExceeded = lenHeaders > MaxHeadersAllowed; limitExceeded {
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lenHeaders = MaxHeadersAllowed
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}
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p.Hdrs = make([]*block.Header, lenHeaders)
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for i := 0; i < int(lenHeaders); i++ {
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header := &block.Header{}
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header.StateRootEnabled = p.StateRootInHeader
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header.DecodeBinary(br)
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p.Hdrs[i] = header
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}
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if br.Err == nil && limitExceeded {
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br.Err = ErrTooManyHeaders
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}
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}
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// EncodeBinary implements the Serializable interface.
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func (p *Headers) EncodeBinary(bw *io.BinWriter) {
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bw.WriteArray(p.Hdrs)
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}
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