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402 lines
8.9 KiB
402 lines
8.9 KiB
// Package keymigrate translates all legacy formatted keys to their
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// new components.
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//
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// The key migration operation as implemented provides a potential
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// model for database migration operations. Crucially, the migration
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// as implemented does not depend on any tendermint code.
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package keymigrate
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import (
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"bytes"
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"context"
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"encoding/binary"
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"encoding/hex"
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"fmt"
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"math/rand"
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"runtime"
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"strconv"
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"sync"
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"github.com/google/orderedcode"
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"github.com/pkg/errors"
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dbm "github.com/tendermint/tm-db"
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)
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type (
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keyID []byte
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migrateFunc func(keyID) (keyID, error)
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)
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func getAllLegacyKeys(db dbm.DB) ([]keyID, error) {
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out := []keyID{}
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iter, err := db.Iterator(nil, nil)
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if err != nil {
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return nil, err
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}
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for ; iter.Valid(); iter.Next() {
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k := iter.Key()
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// make sure it's a key with a legacy format, and skip
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// all other keys, to make it safe to resume the migration.
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if !keyIsLegacy(k) {
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continue
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}
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// there's inconsistency around tm-db's handling of
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// key copies.
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nk := make([]byte, len(k))
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copy(nk, k)
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out = append(out, nk)
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}
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if err = iter.Error(); err != nil {
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return nil, err
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}
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if err = iter.Close(); err != nil {
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return nil, err
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}
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return out, nil
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}
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func makeKeyChan(keys []keyID) <-chan keyID {
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out := make(chan keyID, len(keys))
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defer close(out)
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for _, key := range keys {
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out <- key
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}
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return out
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}
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func keyIsLegacy(key keyID) bool {
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for _, prefix := range []keyID{
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// core "store"
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keyID("consensusParamsKey:"),
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keyID("abciResponsesKey:"),
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keyID("validatorsKey:"),
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keyID("stateKey"),
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keyID("H:"),
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keyID("P:"),
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keyID("C:"),
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keyID("SC:"),
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keyID("BH:"),
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// light
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keyID("size"),
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keyID("lb/"),
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// evidence
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keyID([]byte{0x00}),
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keyID([]byte{0x01}),
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// tx index
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keyID("tx.height/"),
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keyID("tx.hash/"),
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} {
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if bytes.HasPrefix(key, prefix) {
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return true
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}
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}
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// this means it's a tx index...
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if bytes.Count(key, []byte("/")) >= 3 {
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return true
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}
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return keyIsHash(key)
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}
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func keyIsHash(key keyID) bool {
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return len(key) == 32 && !bytes.Contains(key, []byte("/"))
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}
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func migarateKey(key keyID) (keyID, error) {
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switch {
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case bytes.HasPrefix(key, keyID("H:")):
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val, err := strconv.Atoi(string(key[2:]))
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if err != nil {
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return nil, err
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}
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return orderedcode.Append(nil, int64(0), int64(val))
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case bytes.HasPrefix(key, keyID("P:")):
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parts := bytes.Split(key[2:], []byte(":"))
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if len(parts) != 2 {
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return nil, fmt.Errorf("block parts key has %d rather than 2 components",
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len(parts))
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}
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valOne, err := strconv.Atoi(string(parts[0]))
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if err != nil {
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return nil, err
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}
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valTwo, err := strconv.Atoi(string(parts[1]))
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if err != nil {
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return nil, err
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}
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return orderedcode.Append(nil, int64(1), int64(valOne), int64(valTwo))
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case bytes.HasPrefix(key, keyID("C:")):
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val, err := strconv.Atoi(string(key[2:]))
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if err != nil {
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return nil, err
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}
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return orderedcode.Append(nil, int64(2), int64(val))
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case bytes.HasPrefix(key, keyID("SC:")):
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val, err := strconv.Atoi(string(key[3:]))
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if err != nil {
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return nil, err
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}
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return orderedcode.Append(nil, int64(3), int64(val))
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case bytes.HasPrefix(key, keyID("BH:")):
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val, err := strconv.Atoi(string(key[3:]))
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if err != nil {
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return nil, err
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}
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return orderedcode.Append(nil, int64(4), int64(val))
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case bytes.HasPrefix(key, keyID("validatorsKey:")):
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val, err := strconv.Atoi(string(key[14:]))
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if err != nil {
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return nil, err
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}
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return orderedcode.Append(nil, int64(5), int64(val))
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case bytes.HasPrefix(key, keyID("consensusParamsKey:")):
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val, err := strconv.Atoi(string(key[19:]))
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if err != nil {
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return nil, err
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}
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return orderedcode.Append(nil, int64(6), int64(val))
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case bytes.HasPrefix(key, keyID("abciResponsesKey:")):
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val, err := strconv.Atoi(string(key[17:]))
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if err != nil {
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return nil, err
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}
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return orderedcode.Append(nil, int64(7), int64(val))
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case bytes.HasPrefix(key, keyID("stateKey")):
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return orderedcode.Append(nil, int64(8))
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case bytes.HasPrefix(key, []byte{0x00}): // committed evidence
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return convertEvidence(key, 9)
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case bytes.HasPrefix(key, []byte{0x01}): // pending evidence
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return convertEvidence(key, 10)
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case bytes.HasPrefix(key, keyID("lb/")):
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if len(key) < 24 {
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return nil, fmt.Errorf("light block evidence %q in invalid format", string(key))
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}
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val, err := strconv.Atoi(string(key[len(key)-20:]))
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if err != nil {
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return nil, err
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}
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return orderedcode.Append(nil, int64(11), int64(val))
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case bytes.HasPrefix(key, keyID("size")):
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return orderedcode.Append(nil, int64(12))
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case bytes.HasPrefix(key, keyID("tx.height")):
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parts := bytes.Split(key, []byte("/"))
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if len(parts) != 4 {
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return nil, fmt.Errorf("key has %d parts rather than 4", len(parts))
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}
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parts = parts[1:] // drop prefix
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elems := make([]interface{}, 0, len(parts)+1)
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elems = append(elems, "tx.height")
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for idx, pt := range parts {
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val, err := strconv.Atoi(string(pt))
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if err != nil {
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return nil, err
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}
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if idx == 0 {
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elems = append(elems, fmt.Sprintf("%d", val))
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} else {
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elems = append(elems, int64(val))
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}
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}
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return orderedcode.Append(nil, elems...)
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case bytes.Count(key, []byte("/")) >= 3: // tx indexer
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parts := bytes.Split(key, []byte("/"))
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elems := make([]interface{}, 0, 4)
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if len(parts) == 4 {
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elems = append(elems, string(parts[0]), string(parts[1]))
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val, err := strconv.Atoi(string(parts[2]))
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if err != nil {
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return nil, err
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}
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elems = append(elems, int64(val))
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val2, err := strconv.Atoi(string(parts[3]))
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if err != nil {
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return nil, err
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}
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elems = append(elems, int64(val2))
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} else {
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elems = append(elems, string(parts[0]))
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parts = parts[1:]
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val, err := strconv.Atoi(string(parts[len(parts)-1]))
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if err != nil {
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return nil, err
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}
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val2, err := strconv.Atoi(string(parts[len(parts)-2]))
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if err != nil {
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return nil, err
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}
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appKey := bytes.Join(parts[:len(parts)-3], []byte("/"))
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elems = append(elems, string(appKey), int64(val), int64(val2))
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}
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return orderedcode.Append(nil, elems...)
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case keyIsHash(key):
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return orderedcode.Append(nil, "tx.hash", string(key))
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default:
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return nil, fmt.Errorf("key %q is in the wrong format", string(key))
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}
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}
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func convertEvidence(key keyID, newPrefix int64) ([]byte, error) {
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parts := bytes.Split(key[1:], []byte("/"))
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if len(parts) != 2 {
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return nil, fmt.Errorf("evidence key is malformed with %d parts not 2",
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len(parts))
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}
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hb, err := hex.DecodeString(string(parts[0]))
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if err != nil {
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return nil, err
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}
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evidenceHash, err := hex.DecodeString(string(parts[1]))
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if err != nil {
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return nil, err
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}
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return orderedcode.Append(nil, newPrefix, binary.BigEndian.Uint64(hb), string(evidenceHash))
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}
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func replaceKey(db dbm.DB, key keyID, gooseFn migrateFunc) error {
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exists, err := db.Has(key)
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if err != nil {
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return err
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}
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if !exists {
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return nil
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}
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newKey, err := gooseFn(key)
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if err != nil {
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return err
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}
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val, err := db.Get(key)
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if err != nil {
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return err
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}
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batch := db.NewBatch()
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if err = batch.Set(newKey, val); err != nil {
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return err
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}
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if err = batch.Delete(key); err != nil {
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return err
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}
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// 10% of the time, force a write to disk, but mostly don't,
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// because it's faster.
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if rand.Intn(100)%10 == 0 { // nolint:gosec
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if err = batch.WriteSync(); err != nil {
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return err
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}
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} else {
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if err = batch.Write(); err != nil {
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return err
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}
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}
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if err = batch.Close(); err != nil {
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return err
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}
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return nil
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}
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// Migrate converts all legacy key formats to new key formats. The
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// operation is idempotent, so it's safe to resume a failed
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// operation. The operation is somewhat parallelized, relying on the
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// concurrency safety of the underlying databases.
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//
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// Migrate has "continue on error" semantics and will iterate through
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// all legacy keys attempt to migrate them, and will collect all
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// errors and will return only at the end of the operation.
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//
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// The context allows for a safe termination of the operation
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// (e.g connected to a singal handler,) to abort the operation
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// in-between migration operations.
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func Migrate(ctx context.Context, db dbm.DB) error {
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keys, err := getAllLegacyKeys(db)
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if err != nil {
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return err
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}
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numWorkers := runtime.NumCPU()
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wg := &sync.WaitGroup{}
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errs := make(chan error, numWorkers)
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keyCh := makeKeyChan(keys)
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// run migrations.
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for i := 0; i < numWorkers; i++ {
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wg.Add(1)
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go func() {
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defer wg.Done()
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for key := range keyCh {
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err := replaceKey(db, key, migarateKey)
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if err != nil {
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errs <- err
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}
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if ctx.Err() != nil {
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return
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}
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}
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}()
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}
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// collect and process the errors.
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errStrs := []string{}
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signal := make(chan struct{})
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go func() {
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defer close(signal)
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for err := range errs {
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if err == nil {
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continue
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}
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errStrs = append(errStrs, err.Error())
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}
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}()
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// Wait for everything to be done.
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wg.Wait()
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close(errs)
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<-signal
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// check the error results
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if len(errs) != 0 {
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return errors.Errorf("encountered errors during migration: %v", errStrs)
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}
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return nil
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}
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