1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
package controlplane
import (
"context"
"crypto/sha256"
_ "embed"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"strings"
"time"
"aigw/internal/security"
"github.com/jackc/pgx/v5"
"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")
const (
migrationVersion int64 = 2026080610
migrationLockID int64 = 0x41494757 // "AIGW"; stable across migration versions.
)
type Options struct {
DatabaseURL string
RedisURL string
CredentialKey string
PreviousCredentialKeys []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.NewCredentialKeyring(options.CredentialKey, options.PreviousCredentialKeys)
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) PingRedis(ctx context.Context) error {
if s.redis == nil {
return ErrRedisDisabled
}
return s.redis.Ping(ctx).Err()
}
func (s *Store) Ping(ctx context.Context) error { return s.db.Ping(ctx) }
func (s *Store) Migrate(ctx context.Context) error {
return applySchema(ctx, s.db)
}
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()
return applySchema(ctx, db)
}
func MigrationStatusDatabase(ctx context.Context, databaseURL string) (MigrationStatus, error) {
db, err := pgxpool.New(ctx, databaseURL)
if err != nil {
return MigrationStatus{}, fmt.Errorf("configure PostgreSQL: %w", err)
}
defer db.Close()
var result MigrationStatus
err = db.QueryRow(ctx, `SELECT version,name,checksum,applied_at FROM schema_migrations ORDER BY version DESC LIMIT 1`).Scan(&result.Version, &result.Name, &result.Checksum, &result.AppliedAt)
if err != nil {
return MigrationStatus{}, fmt.Errorf("read migration status: %w", err)
}
return result, nil
}
func applySchema(ctx context.Context, db *pgxpool.Pool) error {
hash := sha256.Sum256([]byte(schemaSQL))
checksum := hex.EncodeToString(hash[:])
tx, err := db.Begin(ctx)
if err != nil {
return fmt.Errorf("begin migration: %w", err)
}
defer tx.Rollback(ctx)
if _, err := tx.Exec(ctx, `SELECT pg_advisory_xact_lock($1)`, migrationLockID); err != nil {
return err
}
var migrationsExist bool
if err := tx.QueryRow(ctx, `SELECT to_regclass('schema_migrations') IS NOT NULL`).Scan(&migrationsExist); err != nil {
return fmt.Errorf("inspect migration table: %w", err)
}
if migrationsExist {
var existing string
err = tx.QueryRow(ctx, `SELECT checksum FROM schema_migrations WHERE version=$1`, migrationVersion).Scan(&existing)
if err == nil {
if existing != checksum {
return fmt.Errorf("migration %d checksum changed; deploy an explicit new migration version", migrationVersion)
}
if err := tx.Commit(ctx); err != nil {
return fmt.Errorf("commit migration check: %w", err)
}
return nil
}
if !errors.Is(err, pgx.ErrNoRows) {
return fmt.Errorf("read migration checksum: %w", err)
}
}
if _, err := tx.Exec(ctx, schemaSQL); err != nil {
return fmt.Errorf("apply control-plane schema: %w", err)
}
if _, err := tx.Exec(ctx, `INSERT INTO schema_migrations(version,name,checksum) VALUES ($1,$2,$3) ON CONFLICT DO NOTHING`, migrationVersion, "tenant-spend-alert-preferences", checksum); err != nil {
return err
}
if err := tx.Commit(ctx); err != nil {
return fmt.Errorf("commit migration: %w", err)
}
return nil
}
type MigrationStatus struct {
Version int64 `json:"version"`
Name string `json:"name"`
Checksum string `json:"checksum"`
AppliedAt time.Time `json:"applied_at"`
}
func (s *Store) MigrationStatus(ctx context.Context) (MigrationStatus, error) {
var result MigrationStatus
err := s.db.QueryRow(ctx, `SELECT version,name,checksum,applied_at FROM schema_migrations ORDER BY version DESC LIMIT 1`).Scan(&result.Version, &result.Name, &result.Checksum, &result.AppliedAt)
return result, err
}
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)}
}
|
