channeldb: reference migrations in package

This commit removes the migrations from channeldb and references those
in the migrations_01_to_11 package. This creates a one-way dependency on
the migrations. Future changes to channeldb won't be able to break
migrations anymore.

channeldb/migration_01_to_11/db.go

@@ -32,91 +32,6 @@ type version struct {
 }
 
 var (
-	// dbVersions is storing all versions of database. If current version
-	// of database don't match with latest version this list will be used
-	// for retrieving all migration function that are need to apply to the
-	// current db.
-	dbVersions = []version{
-		{
-			// The base DB version requires no migration.
-			number:    0,
-			migration: nil,
-		},
-		{
-			// The version of the database where two new indexes
-			// for the update time of node and channel updates were
-			// added.
-			number:    1,
-			migration: migrateNodeAndEdgeUpdateIndex,
-		},
-		{
-			// The DB version that added the invoice event time
-			// series.
-			number:    2,
-			migration: migrateInvoiceTimeSeries,
-		},
-		{
-			// The DB version that updated the embedded invoice in
-			// outgoing payments to match the new format.
-			number:    3,
-			migration: migrateInvoiceTimeSeriesOutgoingPayments,
-		},
-		{
-			// The version of the database where every channel
-			// always has two entries in the edges bucket. If
-			// a policy is unknown, this will be represented
-			// by a special byte sequence.
-			number:    4,
-			migration: migrateEdgePolicies,
-		},
-		{
-			// The DB version where we persist each attempt to send
-			// an HTLC to a payment hash, and track whether the
-			// payment is in-flight, succeeded, or failed.
-			number:    5,
-			migration: paymentStatusesMigration,
-		},
-		{
-			// The DB version that properly prunes stale entries
-			// from the edge update index.
-			number:    6,
-			migration: migratePruneEdgeUpdateIndex,
-		},
-		{
-			// The DB version that migrates the ChannelCloseSummary
-			// to a format where optional fields are indicated with
-			// boolean flags.
-			number:    7,
-			migration: migrateOptionalChannelCloseSummaryFields,
-		},
-		{
-			// The DB version that changes the gossiper's message
-			// store keys to account for the message's type and
-			// ShortChannelID.
-			number:    8,
-			migration: migrateGossipMessageStoreKeys,
-		},
-		{
-			// The DB version where the payments and payment
-			// statuses are moved to being stored in a combined
-			// bucket.
-			number:    9,
-			migration: migrateOutgoingPayments,
-		},
-		{
-			// The DB version where we started to store legacy
-			// payload information for all routes, as well as the
-			// optional TLV records.
-			number:    10,
-			migration: migrateRouteSerialization,
-		},
-		{
-			// Add invoice htlc and cltv delta fields.
-			number:    11,
-			migration: migrateInvoices,
-		},
-	}
-
 	// Big endian is the preferred byte order, due to cursor scans over
 	// integer keys iterating in order.
 	byteOrder = binary.BigEndian
@@ -169,12 +84,6 @@ func Open(dbPath string, modifiers ...OptionModifier) (*DB, error) {
 		chanDB, opts.RejectCacheSize, opts.ChannelCacheSize,
 	)
 
-	// Synchronize the version of database and apply migrations if needed.
-	if err := chanDB.syncVersions(dbVersions); err != nil {
-		bdb.Close()
-		return nil, err
-	}
-
 	return chanDB, nil
 }
 
@@ -318,7 +227,7 @@ func createChannelDB(dbPath string) error {
 		}
 
 		meta := &Meta{
-			DbVersionNumber: getLatestDBVersion(dbVersions),
+			DbVersionNumber: 0,
 		}
 		return putMeta(meta, tx)
 	})