Blockchain updates for L2 extension #1430
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| package blockchaininfo | ||
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| import ( | ||
| "bytes" | ||
| "encoding/binary" | ||
| "strconv" | ||
| "strings" | ||
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| "github.com/pkg/errors" | ||
| "github.com/wavesplatform/gowaves/pkg/proto" | ||
| ) | ||
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| const EpochKeyPrefix = "epoch_" | ||
| const blockMeta0xKeyPrefix = "block_0x" | ||
|
Comment on lines
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There was a problem hiding this comment. Can be package private. There was a problem hiding this comment. What is package private? |
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| // Helper function to read uint64 from bytes. | ||
| func readInt64(data *bytes.Reader) (int64, error) { | ||
| var num int64 | ||
| err := binary.Read(data, binary.BigEndian, &num) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| return num, nil | ||
| } | ||
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| // Decode base64 and extract blockHeight and height. | ||
| func extractEpochFromBlockMeta(blockMetaValue []byte) (int64, error) { | ||
| var blockMeta BlockMeta | ||
| err := blockMeta.UnmarshalBinary(blockMetaValue) | ||
| if err != nil { | ||
| return 0, errors.Errorf("failed to unmarshal blockMeta, %v", err) | ||
| } | ||
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| return blockMeta.BlockEpoch, nil | ||
| } | ||
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| func filterEpochEntry(entry proto.DataEntry, beforeHeight uint64) ([]proto.DataEntry, error) { | ||
| key := entry.GetKey() | ||
| // Extract the part after "epoch_" | ||
| epochStr := key[len(EpochKeyPrefix):] | ||
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| epochNumber, err := strconv.ParseUint(epochStr, 10, 64) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| // Return this entry only if epochNumber is greater than beforeHeight | ||
| if epochNumber > beforeHeight { | ||
| return []proto.DataEntry{entry}, nil | ||
| } | ||
| return nil, nil | ||
| } | ||
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| func filterBlock0xEntry(entry proto.DataEntry, beforeHeight uint64) ([]proto.DataEntry, error) { | ||
| // Extract blockHeight and height from base64. | ||
| binaryEntry, ok := entry.(*proto.BinaryDataEntry) | ||
| if !ok { | ||
| return nil, errors.New("failed to convert block meta key to binary data entry") | ||
| } | ||
| epoch, err := extractEpochFromBlockMeta(binaryEntry.Value) | ||
| if err != nil { | ||
| return nil, errors.Errorf("failed to filter data entries, %v", err) | ||
| } | ||
|
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| if epoch < 0 { | ||
| return nil, errors.New("epoch is less than 0") | ||
| } | ||
| // Return this entry only if epochNumber is greater than beforeHeight | ||
| if uint64(epoch) > beforeHeight { | ||
| return []proto.DataEntry{entry}, nil | ||
| } | ||
| return nil, nil | ||
| } | ||
|
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| func filterDataEntries(beforeHeight uint64, dataEntries []proto.DataEntry) ([]proto.DataEntry, error) { | ||
| var filteredDataEntries []proto.DataEntry | ||
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| for _, entry := range dataEntries { | ||
| key := entry.GetKey() | ||
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| switch { | ||
| // Filter "epoch_" prefixed keys. | ||
| case strings.HasPrefix(key, EpochKeyPrefix): | ||
| entryOrNil, err := filterEpochEntry(entry, beforeHeight) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| filteredDataEntries = append(filteredDataEntries, entryOrNil...) | ||
|
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| // Filter block_0x binary entries. | ||
| case strings.HasPrefix(key, blockMeta0xKeyPrefix): | ||
| entryOrNil, err := filterBlock0xEntry(entry, beforeHeight) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| filteredDataEntries = append(filteredDataEntries, entryOrNil...) | ||
|
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| // Default case to handle non-epoch and non-base64 entries. | ||
| default: | ||
| filteredDataEntries = append(filteredDataEntries, entry) | ||
| } | ||
| } | ||
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| return filteredDataEntries, nil | ||
| } | ||
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What if I want to receive updates from two or more chain contracts?
Maybe add
TODOabout it?