swarm: schemas and migrations (#17813)

swarm/storage/database.go

@@ -20,8 +20,6 @@ package storage
 // no need for queueing/caching
 
 import (
-	"fmt"
-
 	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/syndtr/goleveldb/leveldb"
 	"github.com/syndtr/goleveldb/leveldb/iterator"
@@ -46,13 +44,10 @@ func NewLDBDatabase(file string) (*LDBDatabase, error) {
 	return database, nil
 }
 
-func (db *LDBDatabase) Put(key []byte, value []byte) {
+func (db *LDBDatabase) Put(key []byte, value []byte) error {
 	metrics.GetOrRegisterCounter("ldbdatabase.put", nil).Inc(1)
 
-	err := db.db.Put(key, value, nil)
-	if err != nil {
-		fmt.Println("Error put", err)
-	}
+	return db.db.Put(key, value, nil)
 }
 
 func (db *LDBDatabase) Get(key []byte) ([]byte, error) {

swarm/storage/ldbstore.go

@@ -37,7 +37,6 @@ import (
 
 	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/ethereum/go-ethereum/rlp"
-	ch "github.com/ethereum/go-ethereum/swarm/chunk"
 	"github.com/ethereum/go-ethereum/swarm/log"
 	"github.com/ethereum/go-ethereum/swarm/storage/mock"
 	"github.com/syndtr/goleveldb/leveldb"
@@ -61,6 +60,7 @@ var (
 	keyDataIdx     = []byte{4}
 	keyData        = byte(6)
 	keyDistanceCnt = byte(7)
+	keySchema      = []byte{8}
 )
 
 var (
@@ -418,8 +418,8 @@ func (s *LDBStore) Import(in io.Reader) (int64, error) {
 	}
 }
 
-func (s *LDBStore) Cleanup() {
-	//Iterates over the database and checks that there are no chunks bigger than 4kb
+//Cleanup iterates over the database and deletes chunks if they pass the `f` condition
+func (s *LDBStore) Cleanup(f func(*chunk) bool) {
 	var errorsFound, removed, total int
 
 	it := s.db.NewIterator()
@@ -471,7 +471,8 @@ func (s *LDBStore) Cleanup() {
 		cs := int64(binary.LittleEndian.Uint64(c.sdata[:8]))
 		log.Trace("chunk", "key", fmt.Sprintf("%x", key), "ck", fmt.Sprintf("%x", ck), "dkey", fmt.Sprintf("%x", datakey), "dataidx", index.Idx, "po", po, "len data", len(data), "len sdata", len(c.sdata), "size", cs)
 
-		if len(c.sdata) > ch.DefaultSize+8 {
+		// if chunk is to be removed
+		if f(c) {
 			log.Warn("chunk for cleanup", "key", fmt.Sprintf("%x", key), "ck", fmt.Sprintf("%x", ck), "dkey", fmt.Sprintf("%x", datakey), "dataidx", index.Idx, "po", po, "len data", len(data), "len sdata", len(c.sdata), "size", cs)
 			s.delete(index.Idx, getIndexKey(key[1:]), po)
 			removed++
@@ -730,6 +731,30 @@ func (s *LDBStore) tryAccessIdx(ikey []byte, index *dpaDBIndex) bool {
 	return true
 }
 
+// GetSchema is returning the current named schema of the datastore as read from LevelDB
+func (s *LDBStore) GetSchema() (string, error) {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	data, err := s.db.Get(keySchema)
+	if err != nil {
+		if err == leveldb.ErrNotFound {
+			return "", nil
+		}
+		return "", err
+	}
+
+	return string(data), nil
+}
+
+// PutSchema is saving a named schema to the LevelDB datastore
+func (s *LDBStore) PutSchema(schema string) error {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	return s.db.Put(keySchema, []byte(schema))
+}
+
 func (s *LDBStore) Get(_ context.Context, addr Address) (chunk Chunk, err error) {
 	metrics.GetOrRegisterCounter("ldbstore.get", nil).Inc(1)
 	log.Trace("ldbstore.get", "key", addr)

swarm/storage/localstore.go

@@ -184,3 +184,42 @@ func (ls *LocalStore) Iterator(from uint64, to uint64, po uint8, f func(Address,
 func (ls *LocalStore) Close() {
 	ls.DbStore.Close()
 }
+
+// Migrate checks the datastore schema vs the runtime schema, and runs migrations if they don't match
+func (ls *LocalStore) Migrate() error {
+	schema, err := ls.DbStore.GetSchema()
+	if err != nil {
+		log.Error(err.Error())
+		return err
+	}
+
+	log.Debug("found schema", "schema", schema, "runtime-schema", CurrentDbSchema)
+	if schema != CurrentDbSchema {
+		// run migrations
+
+		if schema == "" {
+			log.Debug("running migrations for", "schema", schema, "runtime-schema", CurrentDbSchema)
+
+			cleanupFunc := func(c *chunk) bool {
+				// if one of the ls.Validators passes, it means a chunk is of particular type and it is valid
+				valid := false
+				for _, v := range ls.Validators {
+					if valid = v.Validate(c.Address(), c.Data()); valid {
+						break
+					}
+				}
+				return valid
+			}
+
+			ls.DbStore.Cleanup(cleanupFunc)
+
+			err := ls.DbStore.PutSchema(DbSchemaPurity)
+			if err != nil {
+				log.Error(err.Error())
+				return err
+			}
+		}
+	}
+
+	return nil
+}

swarm/storage/schema.go

@@ -0,0 +1,6 @@
+package storage
+
+// "purity" is the first formal schema of LevelDB we release together with Swarm 0.3.5
+const DbSchemaPurity = "purity"
+
+const CurrentDbSchema = DbSchemaPurity