forked from cerc-io/plugeth
53 lines
1.6 KiB
Go
53 lines
1.6 KiB
Go
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package localstore
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import (
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"github.com/ethereum/go-ethereum/swarm/log"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/opt"
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)
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// The DB schema we want to use. The actual/current DB schema might differ
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// until migrations are run.
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const CurrentDbSchema = DbSchemaSanctuary
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// There was a time when we had no schema at all.
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const DbSchemaNone = ""
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// "purity" is the first formal schema of LevelDB we release together with Swarm 0.3.5
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const DbSchemaPurity = "purity"
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// "halloween" is here because we had a screw in the garbage collector index.
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// Because of that we had to rebuild the GC index to get rid of erroneous
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// entries and that takes a long time. This schema is used for bookkeeping,
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// so rebuild index will run just once.
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const DbSchemaHalloween = "halloween"
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const DbSchemaSanctuary = "sanctuary"
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// returns true if legacy database is in the datadir
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func IsLegacyDatabase(datadir string) bool {
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var (
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legacyDbSchemaKey = []byte{8}
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)
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db, err := leveldb.OpenFile(datadir, &opt.Options{OpenFilesCacheCapacity: 128})
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if err != nil {
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log.Error("got an error while trying to open leveldb path", "path", datadir, "err", err)
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return false
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}
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defer db.Close()
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data, err := db.Get(legacyDbSchemaKey, nil)
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if err != nil {
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if err == leveldb.ErrNotFound {
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// if we haven't found anything under the legacy db schema key- we are not on legacy
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return false
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}
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log.Error("got an unexpected error fetching legacy name from the database", "err", err)
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}
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log.Trace("checking if database scheme is legacy", "schema name", string(data))
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return string(data) == DbSchemaHalloween || string(data) == DbSchemaPurity
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}
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