mssql.go•3.69 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 mssql
import (
"context"
"database/sql"
"fmt"
"net/url"
"github.com/goccy/go-yaml"
"github.com/googleapis/genai-toolbox/internal/sources"
"github.com/googleapis/genai-toolbox/internal/util"
_ "github.com/microsoft/go-mssqldb"
"go.opentelemetry.io/otel/trace"
)
const SourceKind string = "mssql"
// 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
}
return actual, nil
}
type Config struct {
// Cloud SQL MSSQL configs
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"`
Encrypt string `yaml:"encrypt"`
}
func (r Config) SourceConfigKind() string {
// Returns Cloud SQL MSSQL source kind
return SourceKind
}
func (r Config) Initialize(ctx context.Context, tracer trace.Tracer) (sources.Source, error) {
// Initializes a MSSQL source
db, err := initMssqlConnection(ctx, tracer, r.Name, r.Host, r.Port, r.User, r.Password, r.Database, r.Encrypt)
if err != nil {
return nil, fmt.Errorf("unable to create db connection: %w", err)
}
// Verify db connection
err = db.PingContext(ctx)
if err != nil {
return nil, fmt.Errorf("unable to connect successfully: %w", err)
}
s := &Source{
Name: r.Name,
Kind: SourceKind,
Db: db,
}
return s, nil
}
var _ sources.Source = &Source{}
type Source struct {
// Cloud SQL MSSQL struct with connection pool
Name string `yaml:"name"`
Kind string `yaml:"kind"`
Db *sql.DB
}
func (s *Source) SourceKind() string {
// Returns Cloud SQL MSSQL source kind
return SourceKind
}
func (s *Source) MSSQLDB() *sql.DB {
// Returns a Cloud SQL MSSQL database connection pool
return s.Db
}
func initMssqlConnection(
ctx context.Context,
tracer trace.Tracer,
name, host, port, user, pass, dbname, encrypt string,
) (
*sql.DB,
error,
) {
//nolint:all // Reassigned ctx
ctx, span := sources.InitConnectionSpan(ctx, tracer, SourceKind, name)
defer span.End()
userAgent, err := util.UserAgentFromContext(ctx)
if err != nil {
userAgent = "genai-toolbox"
}
// Create dsn
query := url.Values{}
query.Add("app name", userAgent)
query.Add("database", dbname)
if encrypt != "" {
query.Add("encrypt", encrypt)
}
url := &url.URL{
Scheme: "sqlserver",
User: url.UserPassword(user, pass),
Host: fmt.Sprintf("%s:%s", host, port),
RawQuery: query.Encode(),
}
// Open database connection
db, err := sql.Open("sqlserver", url.String())
if err != nil {
return nil, fmt.Errorf("sql.Open: %w", err)
}
return db, nil
}