/
database_migrate.go
95 lines (79 loc) · 2.03 KB
/
database_migrate.go
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package main
import (
"io/ioutil"
"os"
"strings"
)
var goMigrations = map[string](func() error){
"20190213033530-email-notifications.sql": migrateEmails,
}
func migrate() error {
return migrateFromDir(os.Getenv("STATIC") + "/db")
}
func migrateFromDir(dir string) error {
files, err := ioutil.ReadDir(dir)
if err != nil {
logger.Errorf("cannot read directory for migrations: %v", err)
return err
}
statement := `
SELECT filename
FROM migrations;
`
rows, err := db.Query(statement)
if err != nil {
logger.Errorf("cannot query migrations: %v", err)
return err
}
defer rows.Close()
filenames := make(map[string]bool)
for rows.Next() {
var filename string
if err = rows.Scan(&filename); err != nil {
logger.Errorf("cannot scan filename: %v", err)
return err
}
filenames[filename] = true
}
logger.Infof("%d migrations already installed, looking for more", len(filenames))
completed := 0
for _, file := range files {
if strings.HasSuffix(file.Name(), ".sql") {
if !filenames[file.Name()] {
f := dir + string(os.PathSeparator) + file.Name()
contents, err := ioutil.ReadFile(f)
if err != nil {
logger.Errorf("cannot read file %s: %v", file.Name(), err)
return err
}
if _, err = db.Exec(string(contents)); err != nil {
logger.Errorf("cannot execute the SQL in %s: %v", f, err)
return err
}
statement = `
INSERT INTO
migrations (filename)
VALUES ($1 );
`
_, err = db.Exec(statement, file.Name())
if err != nil {
logger.Errorf("cannot insert filename into the migrations table: %v", err)
return err
}
if fn, ok := goMigrations[file.Name()]; ok {
if err = fn(); err != nil {
logger.Errorf("cannot execute Go migration associated with SQL %s: %v", f, err)
return err
}
}
completed++
}
}
}
if completed > 0 {
logger.Infof("%d new migrations completed (%d total)", completed, len(filenames)+completed)
} else {
logger.Infof("none found")
}
return nil
}