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parser.go
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parser.go
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package voyager
import (
"errors"
"regexp"
"strconv"
"strings"
"code.cloudfoundry.org/lager"
)
var noTxPrefix = regexp.MustCompile(`^\s*--\s+(NO_TRANSACTION)`)
var migrationDirection = regexp.MustCompile(`\.(up|down)\.`)
var goMigrationFuncName = regexp.MustCompile(`(Up|Down)_[0-9]*`)
var ErrCouldNotParseDirection = errors.New("could not parse direction for migration")
type parser struct {
source Source
}
func NewParser(source Source) *parser {
return &parser{
source: source,
}
}
func (p *parser) ParseMigrationFilename(logger lager.Logger, fileName string) (Migration, error) {
var (
migration Migration
err error
)
logger.WithData(lager.Data{
"fileName": fileName,
})
migration.Direction, err = determineDirection(fileName)
if err != nil {
logger.Error("failed-to-parse-migration-direction", err)
return migration, err
}
migration.Version, err = schemaVersion(fileName)
if err != nil {
logger.Error("failed-to-parse-migration-version", err)
return migration, err
}
return migration, nil
}
func (p *parser) ParseFileToMigration(logger lager.Logger, migrationName string) (Migration, error) {
var migrationContents string
migration, err := p.ParseMigrationFilename(logger, migrationName)
if err != nil {
return migration, err
}
migrationBytes, err := p.source.Asset(migrationName)
if err != nil {
return migration, err
}
migrationContents = string(migrationBytes)
migration.Strategy = determineMigrationStrategy(migrationName, migrationContents)
switch migration.Strategy {
case GoMigration:
migration.Name = goMigrationFuncName.FindString(migrationContents)
case SQLNoTransaction:
migration.Statements = splitStatements(migrationContents)
migration.Name = migrationName
case SQLTransaction:
migration.Statements = splitStatements(migrationContents)
migration.Name = migrationName
}
return migration, nil
}
func schemaVersion(assetName string) (int, error) {
regex := regexp.MustCompile(`(\d+)`)
match := regex.FindStringSubmatch(assetName)
return strconv.Atoi(match[1])
}
func determineDirection(migrationName string) (string, error) {
matches := migrationDirection.FindStringSubmatch(migrationName)
if len(matches) < 2 {
return "", ErrCouldNotParseDirection
}
return matches[1], nil
}
func determineMigrationStrategy(migrationName string, migrationContents string) Strategy {
if strings.HasSuffix(migrationName, ".go") {
return GoMigration
} else {
if noTxPrefix.MatchString(migrationContents) {
return SQLNoTransaction
}
}
return SQLTransaction
}
func splitStatements(migrationContents string) []string {
var (
fileStatements []string
migrationStatements []string
)
fileStatements = append(fileStatements, strings.Split(migrationContents, ";")...)
// last string is empty
if strings.TrimSpace(fileStatements[len(fileStatements)-1]) == "" {
fileStatements = fileStatements[:len(fileStatements)-1]
}
var isSqlStatement bool = false
var sqlStatement string
for _, statement := range fileStatements {
statement = strings.TrimSpace(statement)
if statement == "BEGIN" || statement == "COMMIT" {
continue
}
if strings.Contains(statement, "BEGIN") {
isSqlStatement = true
sqlStatement = statement + ";"
} else {
if isSqlStatement {
sqlStatement = strings.Join([]string{sqlStatement, statement, ";"}, "")
if strings.HasPrefix(statement, "$$") {
migrationStatements = append(migrationStatements, sqlStatement)
isSqlStatement = false
}
} else {
migrationStatements = append(migrationStatements, statement)
}
}
}
return migrationStatements
}