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/
migrator.go
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/
migrator.go
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package main
import (
"database/sql"
"errors"
"flag"
"fmt"
"os"
"path/filepath"
"time"
"bitbucket.org/liamstask/goose/lib/goose"
log "github.com/Sirupsen/logrus"
"github.com/SUSE/stratos-ui/datastore"
)
const (
TYPE_POSTGRES = "postgresql"
TYPE_MYSQL = "mysql"
DATABASE_PROVIDER = "DATABASE_PROVIDER"
DB_TYPE = "DB_TYPE"
DB_HOST = "DB_HOST"
DB_PORT = "DB_PORT"
DB_USER = "DB_USER"
DB_PASSWORD = "DB_PASSWORD"
DB_DATABASE_NAME = "DB_DATABASE_NAME"
)
// global options. available to any subcommands.
var flagPath = flag.String("path", "db", "folder containing db info")
var flagEnv = flag.String("env", "development", "which DB environment to use")
var flagPgSchema = flag.String("pgschema", "", "which postgres-schema to migrate (default = none)")
var flagCloudFoundry = flag.Bool("cf", false, "detect and parse Cloud Foundry database configuration from VCAP_SERVICES")
// helper to create a DBConf from the given flags
func dbConfFromFlags() (dbconf *goose.DBConf, err error) {
return goose.NewDBConf(*flagPath, *flagEnv, *flagPgSchema)
}
func migrateDatabase() bool {
flag.Usage = usage
flag.Parse()
args := flag.Args()
if len(args) < 1 {
return false
}
if args[0] == "-h" {
flag.Usage()
return true
}
if !parseCloudFoundry() {
return false
}
switch args[0] {
case "up":
upRun(args[1:])
case "status":
statusRun()
case "dbversion":
dbVersionRun()
default:
log.Fatal("Command not supported")
}
// This function returns true if the migrator was called, false otherwise
return true
}
func parseCloudFoundry() bool {
if *flagCloudFoundry {
dbEnv, err := parseCloudFoundryEnv()
if err != nil {
log.Fatal("Failed to parse Cloud Foundry Environment Variables")
}
flag.Set("env", dbEnv)
// If there is no dbEnv, then we are using SQLite, so don't run migrations
if len(dbEnv) == 0 {
log.Println("No DB Environment detected - skipping migrations")
return false
}
}
return true
}
// Perform the migrations
func upRun(args []string) {
conf, err := dbConfFromFlags()
if err != nil {
log.Fatal(err)
}
db, err := goose.OpenDBFromDBConf(conf)
if err != nil {
log.Fatal("Failed to open database connection")
}
defer db.Close()
datastore.ApplyMigrations(conf, db)
if err != nil {
log.Fatal("Migration failed", err)
}
}
func dbVersionRun() {
conf, err := dbConfFromFlags()
if err != nil {
log.Fatal(err)
}
current, err := goose.GetDBVersion(conf)
if err != nil {
log.Fatal(err)
}
log.Printf("goose: dbversion %v\n", current)
}
func statusRun() {
conf, err := dbConfFromFlags()
if err != nil {
log.Fatal(err)
}
// collect all migrations
min := int64(0)
max := int64((1 << 63) - 1)
migrations, e := goose.CollectMigrations(conf.MigrationsDir, min, max)
if e != nil {
log.Fatal(e)
}
db, e := goose.OpenDBFromDBConf(conf)
if e != nil {
log.Fatal("couldn't open DB:", e)
}
defer db.Close()
// must ensure that the version table exists if we're running on a pristine DB
if _, e := goose.EnsureDBVersion(conf, db); e != nil {
log.Fatal(e)
}
log.Printf("goose: status for environment '%v'\n", conf.Env)
log.Println(" Applied At Migration")
log.Println(" =======================================")
for _, m := range migrations {
printMigrationStatus(db, m.Version, filepath.Base(m.Source))
}
}
func printMigrationStatus(db *sql.DB, version int64, script string) {
var row goose.MigrationRecord
q := fmt.Sprintf("SELECT tstamp, is_applied FROM goose_db_version WHERE version_id=%d ORDER BY tstamp DESC LIMIT 1", version)
e := db.QueryRow(q).Scan(&row.TStamp, &row.IsApplied)
if e != nil && e != sql.ErrNoRows {
log.Fatal(e)
}
var appliedAt string
if row.IsApplied {
appliedAt = row.TStamp.Format(time.ANSIC)
} else {
appliedAt = "Pending"
}
log.Printf(" %-24s -- %v\n", appliedAt, script)
}
func usage() {
fmt.Print(usagePrefix)
flag.PrintDefaults()
}
var usagePrefix = `
stratos db migration cli
`
func parseCloudFoundryEnv() (string, error) {
var dbEnv string
fmt.Println("Attempting to parse VCAP_SERVICES")
var dbConfig datastore.DatabaseConfig
parsedDBConfig, err := datastore.ParseCFEnvs(&dbConfig)
if err != nil {
return "", errors.New("Could not parse Cloud Foundry Services environment")
}
if parsedDBConfig {
exportDatabaseConfig(dbConfig)
switch dbType := os.Getenv(DB_TYPE); dbType {
case TYPE_POSTGRES:
dbEnv = "cf_postgres"
fmt.Printf("Migrating postgresql instance on %s\n", os.Getenv(DB_HOST))
case TYPE_MYSQL:
dbEnv = "cf_mysql"
fmt.Printf("Migrating mysql instance on %s\n", os.Getenv(DB_HOST))
default:
// Database service not found or type not recognized
return "", nil
}
return dbEnv, nil
}
return "", nil
}
func exportDatabaseConfig(dbConfig datastore.DatabaseConfig) {
exportString(DATABASE_PROVIDER, dbConfig.DatabaseProvider)
exportString(DB_HOST, dbConfig.Host)
exportString(DB_PORT, dbConfig.Port)
exportString(DB_USER, dbConfig.Username)
exportString(DB_PASSWORD, dbConfig.Password)
exportString(DB_DATABASE_NAME, dbConfig.Database)
if dbConfig.DatabaseProvider == "psql" {
exportString(DB_TYPE, TYPE_POSTGRES)
} else if dbConfig.DatabaseProvider == "mysql" {
exportString(DB_TYPE, TYPE_MYSQL)
}
}
func exportString(name string, value interface{}) {
os.Setenv(name, fmt.Sprintf("%v", value))
}