trino.go•4.47 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 trino
import (
"context"
"database/sql"
"fmt"
"net/url"
"time"
"github.com/goccy/go-yaml"
"github.com/googleapis/genai-toolbox/internal/sources"
_ "github.com/trinodb/trino-go-client/trino"
"go.opentelemetry.io/otel/trace"
)
const SourceKind string = "trino"
// 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 {
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"`
Password string `yaml:"password"`
Catalog string `yaml:"catalog" validate:"required"`
Schema string `yaml:"schema" validate:"required"`
QueryTimeout string `yaml:"queryTimeout"`
AccessToken string `yaml:"accessToken"`
KerberosEnabled bool `yaml:"kerberosEnabled"`
SSLEnabled bool `yaml:"sslEnabled"`
}
func (r Config) SourceConfigKind() string {
return SourceKind
}
func (r Config) Initialize(ctx context.Context, tracer trace.Tracer) (sources.Source, error) {
pool, err := initTrinoConnectionPool(ctx, tracer, r.Name, r.Host, r.Port, r.User, r.Password, r.Catalog, r.Schema, r.QueryTimeout, r.AccessToken, r.KerberosEnabled, r.SSLEnabled)
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) TrinoDB() *sql.DB {
return s.Pool
}
func initTrinoConnectionPool(ctx context.Context, tracer trace.Tracer, name, host, port, user, password, catalog, schema, queryTimeout, accessToken string, kerberosEnabled, sslEnabled bool) (*sql.DB, error) {
//nolint:all // Reassigned ctx
ctx, span := sources.InitConnectionSpan(ctx, tracer, SourceKind, name)
defer span.End()
// Build Trino DSN
dsn, err := buildTrinoDSN(host, port, user, password, catalog, schema, queryTimeout, accessToken, kerberosEnabled, sslEnabled)
if err != nil {
return nil, fmt.Errorf("failed to build DSN: %w", err)
}
db, err := sql.Open("trino", dsn)
if err != nil {
return nil, fmt.Errorf("failed to open connection: %w", err)
}
// Configure connection pool
db.SetMaxOpenConns(10)
db.SetMaxIdleConns(5)
db.SetConnMaxLifetime(time.Hour)
return db, nil
}
func buildTrinoDSN(host, port, user, password, catalog, schema, queryTimeout, accessToken string, kerberosEnabled, sslEnabled bool) (string, error) {
// Build query parameters
query := url.Values{}
query.Set("catalog", catalog)
query.Set("schema", schema)
if queryTimeout != "" {
query.Set("queryTimeout", queryTimeout)
}
if accessToken != "" {
query.Set("accessToken", accessToken)
}
if kerberosEnabled {
query.Set("KerberosEnabled", "true")
}
// Build URL
scheme := "http"
if sslEnabled {
scheme = "https"
}
u := &url.URL{
Scheme: scheme,
Host: fmt.Sprintf("%s:%s", host, port),
RawQuery: query.Encode(),
}
// Only set user and password if not empty
if user != "" && password != "" {
u.User = url.UserPassword(user, password)
} else if user != "" {
u.User = url.User(user)
}
return u.String(), nil
}