/
db.go
172 lines (144 loc) · 3.02 KB
/
db.go
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package anthropoi
import (
"database/sql"
"strings"
"github.com/Urethramancer/signor/stringer"
)
// DBM is a DB manager for user accounts and groups.
type DBM struct {
*sql.DB
host string
port string
user string
password string
name string
mode string
cs *stringer.Stringer
}
// New DBM setup.
func New(host, port, user, password, mode string) *DBM {
dbm := &DBM{
host: host,
port: port,
user: user,
password: password,
mode: mode,
cs: stringer.New(),
}
if host == "" {
dbm.host = "localhost"
}
if port == "" {
dbm.port = "5432"
}
if user == "" {
dbm.user = "postgres"
}
if mode == "" {
dbm.mode = "disable"
}
return dbm
}
// OpenDB and set the pointer in the DBM struct.
func (db *DBM) Connect(name string) error {
var err error
db.name = name
db.DB, err = sql.Open("postgres", db.ConnectionString())
if err != nil {
return err
}
return nil
}
func (db *DBM) ConnectionString() string {
db.cs.Reset()
db.cs.WriteStrings(
"host=", db.host, " ",
"port=", db.port, " ",
"user=", db.user, " ",
)
if db.password != "" {
db.cs.WriteStrings("password=", db.password, " ")
}
if db.name != "" {
db.cs.WriteStrings("dbname=", db.name, " ")
}
if db.mode == "enable" {
db.cs.WriteString("sslmode=enable")
} else {
db.cs.WriteString("sslmode=disable")
}
return db.cs.String()
}
// Create the database and retain the name.
func (db *DBM) Create(name string) error {
if name == "" {
name = DefaultName
}
q := strings.Replace(databaseDefinitions, "{NAME}", name, 1)
_, err := db.Exec(q)
if err == nil {
db.name = name
}
return err
}
// InitDatabase creates the tables, functions and triggers required for the full account system.
func (db *DBM) InitDatabase() error {
var err error
if db.DB != nil {
err = db.Close()
if err != nil {
return err
}
}
db.DB, err = sql.Open("postgres", db.ConnectionString())
if err != nil {
return err
}
_, err = db.Exec(databaseTriggers)
if err != nil {
return err
}
_, err = db.Exec(varTables)
if err != nil {
return err
}
_, err = db.Exec(flagTables)
if err != nil {
return err
}
_, err = db.Exec(userTable)
if err != nil {
return err
}
_, err = db.Exec(groupTables)
return err
}
// InitMailTables for mail mode.
func (db *DBM) InitMailTables() error {
_, err := db.Exec(aliasesTable)
return err
}
// DatabaseExists checks for the existence of the actual database.
func (db *DBM) DatabaseExists(name string) bool {
q := `SELECT EXISTS(SELECT datname FROM pg_catalog.pg_database WHERE datname = '` + name + `');`
row := db.QueryRow(q)
var exists bool
err := row.Scan(&exists)
if err != nil {
return false
}
return exists
}
// Drop a named database.
func (db *DBM) Drop(name string) error {
var err error
q := `SELECT pid, pg_terminate_backend(pid)
FROM pg_stat_activity
WHERE datname = '` + name + `' AND pid <> pg_backend_pid();`
_, err = db.Exec(q)
if err != nil {
return err
}
_, err = db.Exec("DROP DATABASE IF EXISTS " + name + ";")
return err
}