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39 lines
1.0 KiB
39 lines
1.0 KiB
package migration_01_to_11 |
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import ( |
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"github.com/lightningnetwork/lnd/kvdb" |
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) |
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var ( |
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// metaBucket stores all the meta information concerning the state of |
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// the database. |
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metaBucket = []byte("metadata") |
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// dbVersionKey is a boltdb key and it's used for storing/retrieving |
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// current database version. |
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dbVersionKey = []byte("dbp") |
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) |
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// Meta structure holds the database meta information. |
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type Meta struct { |
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// DbVersionNumber is the current schema version of the database. |
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DbVersionNumber uint32 |
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} |
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// putMeta is an internal helper function used in order to allow callers to |
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// re-use a database transaction. See the publicly exported PutMeta method for |
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// more information. |
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func putMeta(meta *Meta, tx kvdb.RwTx) error { |
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metaBucket, err := tx.CreateTopLevelBucket(metaBucket) |
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if err != nil { |
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return err |
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} |
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return putDbVersion(metaBucket, meta) |
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} |
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func putDbVersion(metaBucket kvdb.RwBucket, meta *Meta) error { |
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scratch := make([]byte, 4) |
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byteOrder.PutUint32(scratch, meta.DbVersionNumber) |
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return metaBucket.Put(dbVersionKey, scratch) |
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}
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