tidb.go•3.57 kB
// Copyright 2025 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tidb
import (
"context"
"database/sql"
"fmt"
"regexp"
_ "github.com/go-sql-driver/mysql"
"github.com/goccy/go-yaml"
"github.com/googleapis/genai-toolbox/internal/sources"
"go.opentelemetry.io/otel/trace"
)
const SourceKind string = "tidb"
const TiDBCloudHostPattern string = `gateway\d{2}\.(.+)\.(prod|dev|staging)\.(.+)\.tidbcloud\.com`
// validate interface
var _ sources.SourceConfig = Config{}
func init() {
if !sources.Register(SourceKind, newConfig) {
panic(fmt.Sprintf("source kind %q already registered", SourceKind))
}
}
func newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (sources.SourceConfig, error) {
actual := Config{Name: name}
if err := decoder.DecodeContext(ctx, &actual); err != nil {
return nil, err
}
// If the host is a TiDB Cloud instance, force to use SSL
if IsTiDBCloudHost(actual.Host) {
actual.UseSSL = true
}
return actual, nil
}
type Config struct {
Name string `yaml:"name" validate:"required"`
Kind string `yaml:"kind" validate:"required"`
Host string `yaml:"host" validate:"required"`
Port string `yaml:"port" validate:"required"`
User string `yaml:"user" validate:"required"`
Password string `yaml:"password" validate:"required"`
Database string `yaml:"database" validate:"required"`
UseSSL bool `yaml:"ssl"`
}
func (r Config) SourceConfigKind() string {
return SourceKind
}
func (r Config) Initialize(ctx context.Context, tracer trace.Tracer) (sources.Source, error) {
pool, err := initTiDBConnectionPool(ctx, tracer, r.Name, r.Host, r.Port, r.User, r.Password, r.Database, r.UseSSL)
if err != nil {
return nil, fmt.Errorf("unable to create pool: %w", err)
}
err = pool.PingContext(ctx)
if err != nil {
return nil, fmt.Errorf("unable to connect successfully: %w", err)
}
s := &Source{
Name: r.Name,
Kind: SourceKind,
Pool: pool,
}
return s, nil
}
var _ sources.Source = &Source{}
type Source struct {
Name string `yaml:"name"`
Kind string `yaml:"kind"`
Pool *sql.DB
}
func (s *Source) SourceKind() string {
return SourceKind
}
func (s *Source) TiDBPool() *sql.DB {
return s.Pool
}
func IsTiDBCloudHost(host string) bool {
pattern := `gateway\d{2}\.(.+)\.(prod|dev|staging)\.(.+)\.tidbcloud\.com`
match, err := regexp.MatchString(pattern, host)
if err != nil {
return false
}
return match
}
func initTiDBConnectionPool(ctx context.Context, tracer trace.Tracer, name, host, port, user, pass, dbname string, useSSL bool) (*sql.DB, error) {
//nolint:all // Reassigned ctx
ctx, span := sources.InitConnectionSpan(ctx, tracer, SourceKind, name)
defer span.End()
// Configure the driver to connect to the database
dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?parseTime=true&charset=utf8mb4&tls=%t", user, pass, host, port, dbname, useSSL)
// Interact with the driver directly as you normally would
pool, err := sql.Open("mysql", dsn)
if err != nil {
return nil, fmt.Errorf("sql.Open: %w", err)
}
return pool, nil
}