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sql.go
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sql.go
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package storage
import (
"context"
"database/sql"
"encoding/base64"
// We include the postresql driver in our implementation, so users can pick "postgres" via configuration.
_ "github.com/lib/pq"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
func init() {
if err := RegisterStorage(new(SQLDB)); err != nil {
panic(err)
}
}
const (
SQLConnectionString OptionKey = "sql-connection-string-option"
SQLDriverName OptionKey = "sql-driver-name-option"
)
type SQLDB struct {
db *sql.DB
connectionString string
}
func (s *SQLDB) Init(opts ...Option) error {
connString, sqlDriverName, err := processSQLOptions(opts...)
if err != nil {
return err
}
s.connectionString = connString
db, err := sql.Open(sqlDriverName, connString)
if err != nil {
return err
}
_, err = db.Exec(`CREATE TABLE IF NOT EXISTS key_values (
key varchar,
value varchar
);`)
if err != nil {
return err
}
_, err = db.Exec(`CREATE INDEX idx_key_values ON key_values USING hash (key);`)
if err != nil {
return err
}
_, err = db.Exec(`CREATE TABLE IF NOT EXISTS namespaces (
namespace varchar
);`)
if err != nil {
return err
}
_, err = db.Exec(`CREATE INDEX idx_namespaces ON namespaces USING hash (namespace);`)
if err != nil {
return err
}
s.db = db
return nil
}
func processSQLOptions(opts ...Option) (connString string, sqlDriverName string, err error) {
if len(opts) != 2 {
return "", "", errors.New("sql options must contain connection string and driver name")
}
for _, opt := range opts {
switch opt.ID {
case SQLConnectionString:
maybeConnString, ok := opt.Option.(string)
if !ok {
err = errors.New("sql connection string must be a string")
return
}
if len(maybeConnString) == 0 {
err = errors.New("sql connection string must not be empty")
return
}
connString = maybeConnString
case SQLDriverName:
maybeDriverName, ok := opt.Option.(string)
if !ok {
err = errors.New("sql driver name must be a string")
return
}
if len(maybeDriverName) == 0 {
err = errors.New("sql driver name must not be empty")
return
}
sqlDriverName = maybeDriverName
}
}
if len(connString) == 0 || len(sqlDriverName) == 0 {
err = errors.New("sql connection string and driver name must not be empty")
return
}
return connString, sqlDriverName, nil
}
func (s *SQLDB) Type() Type {
return DatabaseSQL
}
func (s *SQLDB) URI() string {
return s.connectionString
}
func (s *SQLDB) IsOpen() bool {
err := s.db.Ping()
if err != nil {
logrus.WithError(err).Error("pinging db")
return false
}
return true
}
func (s *SQLDB) Close() error {
return s.db.Close()
}
func (s *SQLDB) Write(ctx context.Context, namespace, key string, value []byte) error {
tx, err := s.db.BeginTx(ctx, nil)
if err != nil {
return err
}
defer func(tx *sql.Tx) {
err := tx.Rollback()
if err != nil {
logrus.WithError(err).Error("unable to rollback")
}
}(tx)
if err := write(ctx, tx, namespace, key, value); err != nil {
return err
}
if err := tx.Commit(); err != nil {
return errors.Wrap(err, "committing transaction")
}
return nil
}
type ExecContext interface {
ExecContext(ctx context.Context, query string, args ...any) (sql.Result, error)
}
func write(ctx context.Context, db ExecContext, namespace, key string, value []byte) error {
_, err := db.ExecContext(ctx, "INSERT INTO namespaces (namespace) VALUES ($1) EXCEPT SELECT namespace FROM namespaces WHERE namespace = $2", namespace, namespace)
if err != nil {
return err
}
_, err = db.ExecContext(ctx, "INSERT INTO key_values (key, value) VALUES ($1, $2)", Join(namespace, key), base64.RawStdEncoding.EncodeToString(value))
return err
}
func (s *SQLDB) WriteMany(ctx context.Context, namespaces, keys []string, values [][]byte) error {
stmt, err := s.db.Prepare("INSERT INTO key_values (key, value) VALUES ($1, $2)")
if err != nil {
return err
}
defer func(stmt *sql.Stmt) {
_ = stmt.Close()
}(stmt)
for i, k := range keys {
_, err = stmt.ExecContext(ctx, Join(namespaces[i], k), base64.RawStdEncoding.EncodeToString(values[i]))
if err != nil {
return err
}
}
return err
}
func (s *SQLDB) Read(ctx context.Context, namespace, key string) ([]byte, error) {
return read(ctx, s.db, namespace, key)
}
type QueryRow interface {
QueryRowContext(ctx context.Context, query string, args ...any) *sql.Row
}
func read(ctx context.Context, db QueryRow, namespace, key string) ([]byte, error) {
r := db.QueryRowContext(ctx, "SELECT value FROM key_values WHERE key = $1", Join(namespace, key))
var value string
err := r.Scan(&value)
if err != nil {
if errors.Is(err, sql.ErrNoRows) {
return nil, nil
}
return nil, err
}
decoded, err := base64.RawStdEncoding.DecodeString(value)
if err != nil {
return nil, err
}
return decoded, nil
}
func (s *SQLDB) Exists(ctx context.Context, namespace, key string) (bool, error) {
query := `
SELECT EXISTS (
SELECT 1
FROM key_values
WHERE key = $1
LIMIT 1
)
`
// Execute the query and retrieve the result
var exists bool
err := s.db.QueryRowContext(ctx, query, Join(namespace, key)).Scan(&exists)
if err != nil {
return false, err
}
return exists, nil
}
func (s *SQLDB) ReadAll(ctx context.Context, namespace string) (map[string][]byte, error) {
rows, err := s.db.QueryContext(ctx, "SELECT key, value FROM key_values WHERE key LIKE $1", Join(namespace, "%"))
if err != nil {
return nil, err
}
defer func(rows *sql.Rows) {
err := rows.Close()
if err != nil {
logrus.WithError(err).Error("closing rows")
}
}(rows)
allValues, _, err := readRowsAsMap(rows, namespace)
return allValues, err
}
func readRowsAsMap(rows *sql.Rows, namespace string) (map[string][]byte, string, error) {
allValues := make(map[string][]byte)
var mapKey string
for rows.Next() {
var key string
var value string
if err := rows.Scan(&key, &value); err != nil {
return nil, "", err
}
mapKey = key[len(namespace)+1:]
decoded, err := base64.RawStdEncoding.DecodeString(value)
if err != nil {
return nil, "", err
}
allValues[mapKey] = decoded
}
if err := rows.Err(); err != nil {
return nil, "", err
}
return allValues, mapKey, nil
}
func (s *SQLDB) ReadPage(ctx context.Context, namespace string, pageToken string, pageSize int) (results map[string][]byte, nextPageToken string, err error) {
var rows *sql.Rows
if pageSize == -1 {
rows, err = s.db.QueryContext(ctx, "SELECT * FROM key_values WHERE key LIKE $1 AND key >= $2 ORDER BY key", Join(namespace, "%"), pageToken)
} else {
rows, err = s.db.QueryContext(ctx, "SELECT * FROM key_values WHERE key LIKE $1 AND key >= $2 ORDER BY key LIMIT $3", Join(namespace, "%"), pageToken, pageSize+1)
}
if err != nil {
if errors.Is(err, sql.ErrNoRows) {
return nil, "", nil
}
return nil, "", err
}
pageValues, lastMapKey, err := readRowsAsMap(rows, namespace)
if err != nil {
return nil, "", err
}
if pageSize == -1 {
nextPageToken = ""
} else {
if len(pageValues) <= pageSize {
nextPageToken = ""
} else {
nextPageToken = Join(namespace, lastMapKey)
delete(pageValues, lastMapKey)
}
}
return pageValues, nextPageToken, nil
}
func (s *SQLDB) ReadPrefix(ctx context.Context, namespace, prefix string) (map[string][]byte, error) {
rows, err := s.db.QueryContext(ctx, "SELECT key, value FROM key_values WHERE key LIKE $1", Join(namespace, prefix)+"%")
if err != nil {
return nil, err
}
defer func(rows *sql.Rows) {
err := rows.Close()
if err != nil {
logrus.WithError(err).Error("closing rows")
}
}(rows)
allValues, _, err := readRowsAsMap(rows, namespace)
return allValues, err
}
func (s *SQLDB) ReadAllKeys(ctx context.Context, namespace string) ([]string, error) {
rows, err := s.db.QueryContext(ctx, "SELECT key FROM key_values WHERE key LIKE $1", Join(namespace, "%"))
if err != nil {
return nil, err
}
defer func(rows *sql.Rows) {
err := rows.Close()
if err != nil {
logrus.WithError(err).Error("closing rows")
}
}(rows)
var keys []string
for rows.Next() {
var key string
if err := rows.Scan(&key); err != nil {
return nil, err
}
keys = append(keys, key[len(namespace)+1:])
}
if err := rows.Err(); err != nil {
return nil, err
}
return keys, err
}
func (s *SQLDB) Delete(ctx context.Context, namespace, key string) error {
row := s.db.QueryRowContext(ctx, "SELECT * FROM namespaces WHERE namespace = $1", namespace)
var gotNamespace string
if err := row.Scan(&gotNamespace); err != nil {
if errors.Is(err, sql.ErrNoRows) {
return errors.Errorf("namespace<%s> does not exist", namespace)
}
return err
}
_, err := s.db.ExecContext(ctx, "DELETE FROM key_values WHERE key = $1", Join(namespace, key))
if err != nil {
return err
}
return nil
}
func (s *SQLDB) DeleteNamespace(ctx context.Context, namespace string) error {
row := s.db.QueryRowContext(ctx, "DELETE FROM namespaces WHERE namespace = $1 RETURNING *", namespace)
var namespaceRemoved string
if err := row.Scan(&namespaceRemoved); err != nil {
return errors.Wrap(err, "could not delete namespace<bad>")
}
_, err := s.db.ExecContext(ctx, "DELETE FROM key_values WHERE key LIKE $1", Join(namespace, "%"))
if err != nil {
return err
}
return nil
}
func (s *SQLDB) Update(ctx context.Context, namespace string, key string, values map[string]any) ([]byte, error) {
tx, err := s.db.BeginTx(ctx, nil)
if err != nil {
return nil, err
}
defer func(tx *sql.Tx) {
err := tx.Rollback()
if err != nil {
logrus.WithError(err).Error("unable to rollback")
}
}(tx)
updater := NewUpdater(values)
updatedValue, err := updateValue(ctx, namespace, key, updater, tx)
if err != nil {
return nil, err
}
if err := tx.Commit(); err != nil {
return nil, err
}
return updatedValue, nil
}
func (s *SQLDB) UpdateValueAndOperation(ctx context.Context, namespace, key string, updater Updater, opNamespace, opKey string, opUpdater ResponseSettingUpdater) (first, op []byte, err error) {
tx, err := s.db.BeginTx(ctx, nil)
if err != nil {
return nil, nil, err
}
defer func(tx *sql.Tx) {
err := tx.Rollback()
if err != nil {
logrus.WithError(err).Error("unable to rollback")
}
}(tx)
updatedValue, err := updateValue(ctx, namespace, key, updater, tx)
if err != nil {
return nil, nil, err
}
opUpdater.SetUpdatedResponse(updatedValue)
updatedOpValue, err := updateValue(ctx, opNamespace, opKey, opUpdater, tx)
if err := tx.Commit(); err != nil {
return nil, nil, err
}
return updatedValue, updatedOpValue, err
}
func updateValue(ctx context.Context, namespace string, key string, updater Updater, tx *sql.Tx) ([]byte, error) {
currentValue, err := read(ctx, tx, namespace, key)
if err != nil {
return nil, err
}
if err := updater.Validate(currentValue); err != nil {
return nil, errors.Wrap(err, "validating update")
}
updatedValue, err := updater.Update(currentValue)
if err != nil {
return nil, err
}
encodedUpdatedValue := base64.RawStdEncoding.EncodeToString(updatedValue)
_, err = tx.ExecContext(ctx, "UPDATE key_values SET value = $1 WHERE key = $2", encodedUpdatedValue, Join(namespace, key))
if err != nil {
return nil, err
}
return updatedValue, nil
}
type sqlTx struct {
tx *sql.Tx
}
func (s *sqlTx) Write(ctx context.Context, namespace, key string, value []byte) error {
return write(ctx, s.tx, namespace, key, value)
}
func (s *SQLDB) Execute(ctx context.Context, businessLogicFunc BusinessLogicFunc, _ []WatchKey) (any, error) {
tx, err := s.db.BeginTx(ctx, nil)
if err != nil {
return nil, err
}
defer func(tx *sql.Tx) {
err := tx.Rollback()
if err != nil {
logrus.Errorf("problem rolling back %s", err)
}
}(tx)
bTx := sqlTx{tx: tx}
result, err := businessLogicFunc(ctx, &bTx)
if err != nil {
return nil, errors.Wrap(err, "executing business logic func")
}
if err := tx.Commit(); err != nil {
return nil, errors.Wrap(err, "committing transaction")
}
return result, nil
}
var _ Tx = (*sqlTx)(nil)
var _ ServiceStorage = (*SQLDB)(nil)