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snapshotdb.go
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snapshotdb.go
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package snapshotdb
import (
"bufio"
"encoding/hex"
"errors"
"fmt"
"os"
"sort"
cometbftdb "github.com/cometbft/cometbft-db"
"github.com/cosmos/iavl"
"github.com/gogo/protobuf/jsonpb"
pb "github.com/gogo/protobuf/proto"
"github.com/syndtr/goleveldb/leveldb/opt"
"google.golang.org/protobuf/proto"
"code.vegaprotocol.io/vega/core/types"
snapshot "code.vegaprotocol.io/vega/protos/vega/snapshot/v1"
)
// Data is a representation of the information we scrape from the avl tree.
type Data struct {
Height uint64 `json:"height,omitempty"`
Version int64 `json:"version"`
Size int64 `json:"size"`
Hash string `json:"hash"`
}
type Database interface {
cometbftdb.DB
Clear() error
}
func initialiseTree(dbPath string) (*cometbftdb.GoLevelDB, *iavl.MutableTree, error) {
conn, err := cometbftdb.NewGoLevelDBWithOpts(
"snapshot",
dbPath,
&opt.Options{
ErrorIfMissing: true,
})
if err != nil {
return nil, nil, fmt.Errorf("failed to open database located at %s : %w", dbPath, err)
}
tree, err := iavl.NewMutableTree(conn, 0, false)
if err != nil {
return nil, nil, err
}
if _, err = tree.Load(); err != nil {
return nil, nil, err
}
return conn, tree, nil
}
// SnapshotData returns an overview of each snapshot saved to disk, namely the height and its hash.
func SnapshotData(dbPath string, heightToOutput uint64) ([]Data, []Data, error) {
conn, tree, err := initialiseTree(dbPath)
defer func() {
if conn != nil {
conn.Close()
}
}()
if err != nil {
return nil, nil, err
}
versions := tree.AvailableVersions()
trees := make([]Data, 0, len(versions))
invalidVersions := make([]Data, 0)
for _, version := range versions {
v, err := tree.LazyLoadVersion(int64(version))
if err != nil {
return nil, nil, err
}
snapshotHash, _ := tree.Hash()
app, err := types.AppStateFromTree(tree.ImmutableTree)
if err != nil {
invalidVersions = append(invalidVersions, Data{
Version: v,
Hash: hex.EncodeToString(snapshotHash),
})
continue
}
data := Data{
Version: v,
Height: app.AppState.Height,
Hash: hex.EncodeToString(snapshotHash),
Size: tree.Size(),
}
if heightToOutput > 0 {
if app.AppState.Height == heightToOutput {
return []Data{data}, nil, nil
}
}
trees = append(trees, data)
}
sort.SliceStable(trees, func(i, j int) bool {
return trees[i].Height > trees[j].Height
})
return trees, invalidVersions, nil
}
// SavePayloadsToFile given a block height and file path writes all the payloads for that snapshot height
// to the file in json format.
func SavePayloadsToFile(dbPath string, outputPath string, heightToOutput uint64) error {
conn, tree, err := initialiseTree(dbPath)
defer func() {
if conn != nil {
conn.Close()
}
}()
if err != nil {
return err
}
versions := tree.AvailableVersions()
for i := len(versions) - 1; i > -1; i-- {
_, err := tree.LazyLoadVersion(int64(versions[i]))
if err != nil {
return err
}
// looking up the appstate directly by its key first then unmarshalling all payloads
// is quicker
app, err := types.AppStateFromTree(tree.ImmutableTree)
if err != nil {
return err
}
if app.AppState.Height != heightToOutput {
continue
}
payloads, _, _ := getAllPayloads(tree)
return writePayloads(payloads, outputPath)
}
return errors.New("failed to find snapshot for block-height")
}
func writePayloads(payloads []*snapshot.Payload, outputPath string) error {
f, err := os.Create(outputPath)
if err != nil {
return err
}
defer func() { _ = f.Close() }()
w := bufio.NewWriter(f)
m := jsonpb.Marshaler{Indent: " "}
payloadData := struct {
Data []*snapshot.Payload `json:"data,omitempty" protobuf:"bytes,1,rep,name=data"`
pb.Message
}{
Data: payloads,
}
s, err := m.MarshalToString(&payloadData)
if err != nil {
return err
}
if _, err = w.WriteString(s); err != nil {
return err
}
if err = w.Flush(); err != nil {
return err
}
return nil
}
func getAllPayloads(tree *iavl.MutableTree) (payloads []*snapshot.Payload, blockHeight uint64, err error) {
_, err = tree.Iterate(func(key []byte, val []byte) bool {
p := new(snapshot.Payload)
if err = proto.Unmarshal(val, p); err != nil {
return true
}
if appState := p.GetAppState(); appState != nil {
blockHeight = appState.GetHeight()
}
payloads = append(payloads, p)
return false
})
if err != nil {
return
}
return payloads, blockHeight, err
}