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package controlplane
import (
"context"
_ "embed"
"encoding/json"
"errors"
"fmt"
"strings"
"time"
"aigw/internal/security"
"github.com/jackc/pgx/v5/pgxpool"
"github.com/redis/go-redis/v9"
)
//go:embed schema.sql
var schemaSQL string
var ErrRedisDisabled = errors.New("Redis propagation is disabled")
type Options struct {
DatabaseURL string
RedisURL string
CredentialKey string
RedisChannel string
VersionCacheKey string
}
type Store struct {
db *pgxpool.Pool
redis *redis.Client
cipher *security.CredentialCipher
redisChannel string
versionCacheKey string
}
func NewStore(ctx context.Context, options Options) (*Store, error) {
cipher, err := security.NewCredentialCipher(options.CredentialKey)
if err != nil {
return nil, err
}
db, err := pgxpool.New(ctx, options.DatabaseURL)
if err != nil {
return nil, fmt.Errorf("configure PostgreSQL: %w", err)
}
if err := db.Ping(ctx); err != nil {
db.Close()
return nil, fmt.Errorf("connect PostgreSQL: %w", err)
}
var redisClient *redis.Client
if strings.TrimSpace(options.RedisURL) != "" {
redisOptions, err := redis.ParseURL(options.RedisURL)
if err != nil {
db.Close()
return nil, fmt.Errorf("parse Redis URL: %w", err)
}
redisClient = redis.NewClient(redisOptions)
}
return &Store{
db: db, redis: redisClient, cipher: cipher,
redisChannel: options.RedisChannel, versionCacheKey: options.VersionCacheKey,
}, nil
}
func (s *Store) Close() error {
s.db.Close()
if s.redis == nil {
return nil
}
return s.redis.Close()
}
func (s *Store) RedisEnabled() bool {
return s.redis != nil
}
func (s *Store) Migrate(ctx context.Context) error {
if _, err := s.db.Exec(ctx, schemaSQL); err != nil {
return fmt.Errorf("apply control-plane schema: %w", err)
}
return nil
}
func MigrateDatabase(ctx context.Context, databaseURL string) error {
db, err := pgxpool.New(ctx, databaseURL)
if err != nil {
return fmt.Errorf("configure PostgreSQL: %w", err)
}
defer db.Close()
if _, err := db.Exec(ctx, schemaSQL); err != nil {
return fmt.Errorf("apply control-plane schema: %w", err)
}
return nil
}
func (s *Store) DatabaseGeneration(ctx context.Context) (int64, error) {
var generation int64
err := s.db.QueryRow(ctx, `SELECT generation FROM control_state WHERE singleton = TRUE`).Scan(&generation)
if err != nil {
return 0, fmt.Errorf("read control-plane generation: %w", err)
}
return generation, nil
}
func (s *Store) RedisGeneration(ctx context.Context) (int64, error) {
if s.redis == nil {
return 0, ErrRedisDisabled
}
generation, err := s.redis.Get(ctx, s.versionCacheKey).Int64()
if errors.Is(err, redis.Nil) {
return 0, nil
}
return generation, err
}
func (s *Store) PublishChange(ctx context.Context, event ChangeEvent) error {
if s.redis == nil {
return ErrRedisDisabled
}
payload, err := json.Marshal(event)
if err != nil {
return err
}
pipeline := s.redis.TxPipeline()
pipeline.Set(ctx, s.versionCacheKey, event.Generation, 0)
pipeline.Publish(ctx, s.redisChannel, payload)
_, err = pipeline.Exec(ctx)
if err != nil {
return fmt.Errorf("publish control-plane change: %w", err)
}
return nil
}
func (s *Store) Subscribe(ctx context.Context) (<-chan ChangeMessage, func() error, error) {
if s.redis == nil {
return nil, nil, ErrRedisDisabled
}
pubsub := s.redis.Subscribe(ctx, s.redisChannel)
if _, err := pubsub.Receive(ctx); err != nil {
_ = pubsub.Close()
return nil, nil, fmt.Errorf("subscribe control-plane changes: %w", err)
}
messages := make(chan ChangeMessage)
redisMessages := pubsub.Channel()
go func() {
defer close(messages)
for {
select {
case <-ctx.Done():
return
case message, ok := <-redisMessages:
if !ok {
return
}
select {
case messages <- ChangeMessage{Payload: message.Payload}:
case <-ctx.Done():
return
}
}
}
}()
return messages, pubsub.Close, nil
}
func newChange(generation int64, resource, id string) ChangeEvent {
return ChangeEvent{Generation: generation, Resource: resource, ID: id, ChangedAt: time.Now().UTC().Format(time.RFC3339Nano)}
}
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