feat(version): migrate version to semver [EE-3756] (#7693)

redisigned version bucket and migration code

api/datastore/migrate_legacyversion.go

@@ -0,0 +1,114 @@
+package datastore
+
+import (
+	portaineree "github.com/portainer/portainer/api"
+	"github.com/portainer/portainer/api/database/models"
+	"github.com/portainer/portainer/api/dataservices"
+)
+
+const (
+	bucketName         = "version"
+	legacyDBVersionKey = "DB_VERSION"
+	legacyInstanceKey  = "INSTANCE_ID"
+	legacyEditionKey   = "EDITION"
+)
+
+var dbVerToSemVerMap = map[int]string{
+	18: "1.21",
+	19: "1.22",
+	20: "1.22.1",
+	21: "1.22.2",
+	22: "1.23",
+	23: "1.24",
+	24: "1.24.1",
+	25: "2.0",
+	26: "2.1",
+	27: "2.2",
+	28: "2.4",
+	29: "2.4",
+	30: "2.6",
+	31: "2.7",
+	32: "2.9",
+	33: "2.9.1",
+	34: "2.10",
+	35: "2.9.3",
+	36: "2.11",
+	40: "2.13",
+	50: "2.14",
+	51: "2.14.1",
+	52: "2.14.2",
+	60: "2.15",
+	61: "2.15.1",
+	70: "2.16",
+}
+
+func dbVersionToSemanticVersion(dbVersion int) string {
+	if dbVersion < 18 {
+		return "1.0.0"
+	}
+
+	ver, ok := dbVerToSemVerMap[dbVersion]
+	if ok {
+		return ver
+	}
+
+	// We should always return something sensible
+	switch {
+	case dbVersion < 40:
+		return "2.11"
+	case dbVersion < 50:
+		return "2.13"
+	case dbVersion < 60:
+		return "2.14.2"
+	case dbVersion < 70:
+		return "2.15.1"
+	}
+
+	return "2.16.0"
+}
+
+// getOrMigrateLegacyVersion to new Version struct
+func (store *Store) getOrMigrateLegacyVersion() (*models.Version, error) {
+	// Very old versions of portainer did not have a version bucket, lets set some defaults
+	dbVersion := 24
+	edition := int(portaineree.PortainerCE)
+	instanceId := ""
+
+	// If we already have a version key, we don't need to migrate
+	v, err := store.VersionService.Version()
+	if err == nil || !dataservices.IsErrObjectNotFound(err) {
+		return v, err
+	}
+
+	err = store.connection.GetObject(bucketName, []byte(legacyDBVersionKey), &dbVersion)
+	if err != nil && !dataservices.IsErrObjectNotFound(err) {
+		return nil, err
+	}
+
+	err = store.connection.GetObject(bucketName, []byte(legacyEditionKey), &edition)
+	if err != nil && !dataservices.IsErrObjectNotFound(err) {
+		return nil, err
+	}
+
+	err = store.connection.GetObject(bucketName, []byte(legacyInstanceKey), &instanceId)
+	if err != nil && !dataservices.IsErrObjectNotFound(err) {
+		return nil, err
+	}
+
+	return &models.Version{
+		SchemaVersion: dbVersionToSemanticVersion(dbVersion),
+		Edition:       edition,
+		InstanceID:    string(instanceId),
+	}, nil
+}
+
+// finishMigrateLegacyVersion writes the new version to the DB and removes the old version keys from the DB
+func (store *Store) finishMigrateLegacyVersion(versionToWrite *models.Version) error {
+	err := store.VersionService.UpdateVersion(versionToWrite)
+
+	// Remove legacy keys if present
+	store.connection.DeleteObject(bucketName, []byte(legacyDBVersionKey))
+	store.connection.DeleteObject(bucketName, []byte(legacyEditionKey))
+	store.connection.DeleteObject(bucketName, []byte(legacyInstanceKey))
+	return err
+}