/
sql_query.go
198 lines (170 loc) · 4.81 KB
/
sql_query.go
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/*
Maddy Mail Server - Composable all-in-one email server.
Copyright © 2019-2020 Max Mazurov <fox.cpp@disroot.org>, Maddy Mail Server contributors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package table
import (
"database/sql"
"fmt"
"strings"
"github.com/foxcpp/maddy/framework/config"
"github.com/foxcpp/maddy/framework/module"
_ "github.com/lib/pq"
)
type SQL struct {
modName string
instName string
db *sql.DB
lookup *sql.Stmt
add *sql.Stmt
list *sql.Stmt
set *sql.Stmt
del *sql.Stmt
}
func NewSQL(modName, instName string, _, _ []string) (module.Module, error) {
return &SQL{
modName: modName,
instName: instName,
}, nil
}
func (s *SQL) Name() string {
return s.modName
}
func (s *SQL) InstanceName() string {
return s.instName
}
func (s *SQL) Init(cfg *config.Map) error {
var (
driver string
initQueries []string
dsnParts []string
lookupQuery string
addQuery string
listQuery string
removeQuery string
setQuery string
)
cfg.StringList("init", false, false, nil, &initQueries)
cfg.String("driver", false, true, "", &driver)
cfg.StringList("dsn", false, true, nil, &dsnParts)
cfg.String("lookup", false, true, "", &lookupQuery)
cfg.String("add", false, false, "", &addQuery)
cfg.String("list", false, false, "", &listQuery)
cfg.String("del", false, false, "", &removeQuery)
cfg.String("set", false, false, "", &setQuery)
if _, err := cfg.Process(); err != nil {
return err
}
db, err := sql.Open(driver, strings.Join(dsnParts, " "))
if err != nil {
return config.NodeErr(cfg.Block, "failed to open db: %v", err)
}
s.db = db
for _, init := range initQueries {
if _, err := db.Exec(init); err != nil {
return config.NodeErr(cfg.Block, "init query failed: %v", err)
}
}
s.lookup, err = db.Prepare(lookupQuery)
if err != nil {
return config.NodeErr(cfg.Block, "failed to prepare lookup query: %v", err)
}
if addQuery != "" {
s.add, err = db.Prepare(addQuery)
if err != nil {
return config.NodeErr(cfg.Block, "failed to prepare add query: %v", err)
}
}
if listQuery != "" {
s.list, err = db.Prepare(listQuery)
if err != nil {
return config.NodeErr(cfg.Block, "failed to prepare list query: %v", err)
}
}
if setQuery != "" {
s.set, err = db.Prepare(setQuery)
if err != nil {
return config.NodeErr(cfg.Block, "failed to prepare set query: %v", err)
}
}
if removeQuery != "" {
s.del, err = db.Prepare(removeQuery)
if err != nil {
return config.NodeErr(cfg.Block, "failed to prepare del query: %v", err)
}
}
return nil
}
func (s *SQL) Close() error {
s.lookup.Close()
return s.db.Close()
}
func (s *SQL) Lookup(val string) (string, bool, error) {
var repl string
row := s.lookup.QueryRow(val)
if err := row.Scan(&repl); err != nil {
if err == sql.ErrNoRows {
return "", false, nil
}
return "", false, fmt.Errorf("%s: lookup %s: %w", s.modName, val, err)
}
return repl, true, nil
}
func (s *SQL) Keys() ([]string, error) {
if s.list == nil {
return nil, fmt.Errorf("%s: table is not mutable (no 'list' query)", s.modName)
}
rows, err := s.list.Query()
if err != nil {
return nil, fmt.Errorf("%s: list: %w", s.modName, err)
}
defer rows.Close()
var list []string
for rows.Next() {
var key string
if err := rows.Scan(&key); err != nil {
return nil, fmt.Errorf("%s: list: %w", s.modName, err)
}
list = append(list, key)
}
return list, nil
}
func (s *SQL) RemoveKey(k string) error {
if s.del == nil {
return fmt.Errorf("%s: table is not mutable (no 'del' query)", s.modName)
}
_, err := s.del.Exec(sql.Named("key", k))
if err != nil {
return fmt.Errorf("%s: del %s: %w", s.modName, k, err)
}
return nil
}
func (s *SQL) SetKey(k, v string) error {
if s.set == nil {
return fmt.Errorf("%s: table is not mutable (no 'set' query)", s.modName)
}
if s.add == nil {
return fmt.Errorf("%s: table is not mutable (no 'add' query)", s.modName)
}
if _, err := s.add.Exec(sql.Named("key", k), sql.Named("value", v)); err != nil {
if _, err := s.set.Exec(sql.Named("key", k), sql.Named("value", v)); err != nil {
return fmt.Errorf("%s: add %s: %w", s.modName, k, err)
}
return nil
}
return nil
}
func init() {
module.RegisterDeprecated("sql_query", "table.sql_query", NewSQL)
module.Register("table.sql_query", NewSQL)
}