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f0911765af
In this commit, we migrate all the code in `channeldb` to only reference the new `kvdb` package rather than `bbolt` directly. In many instances, we need to add two version to fetch a bucket as both read and write when needed. As an example, we add a new `fetchChanBucketRw` function. This function is identical to `fetchChanBucket`, but it will be used to fetch the main channel bucket for all _write_ transactions. We need a new method as you can pass a write transaction where a read is accepted, but not the other way around due to the stronger typing of the new `kvdb` package.
40 lines
1.0 KiB
Go
40 lines
1.0 KiB
Go
package migration_01_to_11
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import (
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"github.com/lightningnetwork/lnd/channeldb/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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