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134 lines
3.0 KiB
134 lines
3.0 KiB
package blocks
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import (
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"bytes"
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"errors"
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"sync"
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)
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// Helper for keeping track of block parts.
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type BlockPartSet struct {
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mtx sync.Mutex
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signer *Account
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height uint32
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round uint16 // Not used
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total uint16
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numParts uint16
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parts []*BlockPart
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_block *Block // cache
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}
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var (
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ErrInvalidBlockPartSignature = errors.New("Invalid block part signature") // Peer gave us a fake part
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ErrInvalidBlockPartConflict = errors.New("Invalid block part conflict") // Signer signed conflicting parts
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)
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// Signer may be nil if signer is unknown beforehand.
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func NewBlockPartSet(height uint32, round uint16, signer *Account) *BlockPartSet {
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return &BlockPartSet{
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signer: signer,
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height: height,
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round: round,
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}
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}
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// In the case where the signer wasn't known prior to NewBlockPartSet(),
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// user should call SetSigner() prior to AddBlockPart().
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func (bps *BlockPartSet) SetSigner(signer *Account) {
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bps.mtx.Lock()
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defer bps.mtx.Unlock()
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if bps.signer != nil {
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panic("BlockPartSet signer already set.")
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}
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bps.signer = signer
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}
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func (bps *BlockPartSet) BlockParts() []*BlockPart {
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bps.mtx.Lock()
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defer bps.mtx.Unlock()
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return bps.parts
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}
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func (bps *BlockPartSet) BitArray() []byte {
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bps.mtx.Lock()
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defer bps.mtx.Unlock()
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if bps.parts == nil {
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return nil
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}
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bitArray := make([]byte, (len(bps.parts)+7)/8)
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for i, part := range bps.parts {
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if part != nil {
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bitArray[i/8] |= 1 << uint(i%8)
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}
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}
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return bitArray
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}
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// If the part isn't valid, returns an error.
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// err can be ErrInvalidBlockPart[Conflict|Signature]
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func (bps *BlockPartSet) AddBlockPart(part *BlockPart) (added bool, err error) {
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bps.mtx.Lock()
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defer bps.mtx.Unlock()
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// If part is invalid, return an error.
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err = part.ValidateWithSigner(bps.signer)
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if err != nil {
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return false, err
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}
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if bps.parts == nil {
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// First received part for this round.
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bps.parts = make([]*BlockPart, part.Total)
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bps.total = uint16(part.Total)
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bps.parts[int(part.Index)] = part
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bps.numParts++
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return true, nil
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} else {
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// Check part.Index and part.Total
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if uint16(part.Index) >= bps.total {
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return false, ErrInvalidBlockPartConflict
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}
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if uint16(part.Total) != bps.total {
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return false, ErrInvalidBlockPartConflict
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}
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// Check for existing parts.
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existing := bps.parts[part.Index]
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if existing != nil {
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if existing.Bytes.Equals(part.Bytes) {
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// Ignore duplicate
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return false, nil
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} else {
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return false, ErrInvalidBlockPartConflict
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}
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} else {
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bps.parts[int(part.Index)] = part
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bps.numParts++
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return true, nil
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}
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}
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}
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func (bps *BlockPartSet) IsComplete() bool {
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bps.mtx.Lock()
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defer bps.mtx.Unlock()
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return bps.total > 0 && bps.total == bps.numParts
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}
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func (bps *BlockPartSet) Block() *Block {
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if !bps.IsComplete() {
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return nil
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}
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bps.mtx.Lock()
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defer bps.mtx.Unlock()
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if bps._block == nil {
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blockBytes := []byte{}
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for _, part := range bps.parts {
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blockBytes = append(blockBytes, part.Bytes...)
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}
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block := ReadBlock(bytes.NewReader(blockBytes))
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bps._block = block
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}
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return bps._block
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}
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