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package limit
import (
"context"
"database/sql"
"errors"
"github.com/target/goalert/permission"
"github.com/target/goalert/util"
"github.com/target/goalert/validation/validate"
)
// A Store allows getting and setting system limits.
type Store struct {
update *sql.Stmt
findAll *sql.Stmt
findOne *sql.Stmt
setOne *sql.Stmt
resetAll *sql.Stmt
}
// NewStore creates a new DB and prepares all necessary SQL statements.
func NewStore(ctx context.Context, db *sql.DB) (*Store, error) {
p := &util.Prepare{DB: db, Ctx: ctx}
return &Store{
update: p.P(`update config_limits set max = $2 where id = $1`),
findAll: p.P(`select id, max from config_limits`),
findOne: p.P(`select max from config_limits where id = $1`),
setOne: p.P(`
insert into config_limits (id, max)
values ($1, $2)
on conflict (id) do update
set max = $2
`),
resetAll: p.P(`delete from config_limits`),
}, p.Err
}
// UpdateLimitsTx updates all configurable limits.
func (s *Store) UpdateLimitsTx(ctx context.Context, tx *sql.Tx, id string, max int) error {
err := permission.LimitCheckAny(ctx, permission.System, permission.Admin)
if err != nil {
return err
}
stmt := s.update
if tx != nil {
stmt = tx.Stmt(stmt)
}
_, err = stmt.ExecContext(ctx, id, max)
if err != nil {
return err
}
return err
}
// ResetAll will reset all configurable limits to the default (no-limit).
func (s *Store) ResetAll(ctx context.Context) error {
err := permission.LimitCheckAny(ctx, permission.Admin)
if err != nil {
return err
}
_, err = s.resetAll.ExecContext(ctx)
return err
}
// Max will return the current max value for the given limit.
func (s *Store) Max(ctx context.Context, id ID) (int, error) {
err := permission.LimitCheckAny(ctx, permission.Admin)
if err != nil {
return 0, err
}
err = id.Valid()
if err != nil {
return 0, err
}
var max int
err = s.findOne.QueryRowContext(ctx, id).Scan(&max)
if errors.Is(err, sql.ErrNoRows) {
return -1, nil
}
if err != nil {
return 0, err
}
return max, nil
}
// All will get the current value of all limits.
func (s *Store) All(ctx context.Context) (Limits, error) {
err := permission.LimitCheckAny(ctx, permission.System, permission.Admin)
if err != nil {
return nil, err
}
rows, err := s.findAll.QueryContext(ctx)
if err != nil {
return nil, err
}
defer rows.Close()
var id string
var max int
l := make(Limits, 8)
for rows.Next() {
err = rows.Scan(&id, &max)
if err != nil {
return nil, err
}
l[ID(id)] = max
}
return l, nil
}
// SetMax allows setting the max value for a limit.
func (s *Store) SetMax(ctx context.Context, id ID, max int) error {
err := permission.LimitCheckAny(ctx, permission.Admin)
if err != nil {
return err
}
err = validate.Many(id.Valid(), validate.Range("Max", max, -1, 9000))
if err != nil {
return err
}
_, err = s.setOne.ExecContext(ctx, id, max)
return err
}
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