57 lines
1.8 KiB
Go
57 lines
1.8 KiB
Go
// Copyright (c) 2017-2026 Lethean (https://lt.hn)
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//
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// Licensed under the European Union Public Licence (EUPL) version 1.2.
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// SPDX-License-Identifier: EUPL-1.2
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package chain
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import (
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"bytes"
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"dappco.re/go/core"
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coreerr "dappco.re/go/core/log"
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"dappco.re/go/core/blockchain/config"
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"dappco.re/go/core/blockchain/types"
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"dappco.re/go/core/blockchain/wire"
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)
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// ValidateHeader checks a block header before storage.
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// expectedHeight is the height at which this block would be stored.
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func (c *Chain) ValidateHeader(b *types.Block, expectedHeight uint64) error {
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currentHeight, err := c.Height()
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if err != nil {
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return coreerr.E("Chain.ValidateHeader", "validate: get height", err)
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}
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// Height sequence check.
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if expectedHeight != currentHeight {
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return coreerr.E("Chain.ValidateHeader", core.Sprintf("validate: expected height %d but chain is at %d", expectedHeight, currentHeight), nil)
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}
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// Genesis block: prev_id must be zero.
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if expectedHeight == 0 {
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if !b.PrevID.IsZero() {
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return coreerr.E("Chain.ValidateHeader", "validate: genesis block has non-zero prev_id", nil)
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}
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return nil
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}
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// Non-genesis: prev_id must match top block hash.
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_, topMeta, err := c.TopBlock()
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if err != nil {
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return coreerr.E("Chain.ValidateHeader", "validate: get top block", err)
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}
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if b.PrevID != topMeta.Hash {
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return coreerr.E("Chain.ValidateHeader", core.Sprintf("validate: prev_id %s does not match top block %s", b.PrevID, topMeta.Hash), nil)
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}
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// Block size check.
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var buf bytes.Buffer
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enc := wire.NewEncoder(&buf)
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wire.EncodeBlock(enc, b)
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if enc.Err() == nil && uint64(buf.Len()) > config.MaxBlockSize {
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return coreerr.E("Chain.ValidateHeader", core.Sprintf("validate: block size %d exceeds max %d", buf.Len(), config.MaxBlockSize), nil)
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}
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return nil
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}
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