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
|
package controlplane
import (
"context"
"encoding/json"
"log/slog"
"sync"
"sync/atomic"
"time"
"aigw/internal/auth"
"aigw/internal/catalog"
)
const broadcastQueueSize = 128
type managerStore interface {
LoadSnapshot(context.Context) (Snapshot, error)
DatabaseGeneration(context.Context) (int64, error)
PublishChange(context.Context, ChangeEvent) error
Subscribe(context.Context) (<-chan ChangeMessage, func() error, error)
RedisEnabled() bool
}
type Manager struct {
store managerStore
catalog *catalog.Catalog
authenticator *auth.StaticAuthenticator
logger *slog.Logger
pollInterval time.Duration
generation atomic.Int64
redisConnected atomic.Bool
reloadMu sync.Mutex
broadcasts chan ChangeEvent
}
func NewManager(store managerStore, modelCatalog *catalog.Catalog, authenticator *auth.StaticAuthenticator, logger *slog.Logger, pollInterval time.Duration) *Manager {
if pollInterval <= 0 {
pollInterval = 30 * time.Second
}
return &Manager{
store: store, catalog: modelCatalog, authenticator: authenticator,
logger: logger, pollInterval: pollInterval, broadcasts: make(chan ChangeEvent, broadcastQueueSize),
}
}
func (m *Manager) Reload(ctx context.Context) (int64, error) {
m.reloadMu.Lock()
defer m.reloadMu.Unlock()
snapshot, err := m.store.LoadSnapshot(ctx)
if err != nil {
return m.generation.Load(), err
}
m.catalog.Replace(snapshot.Models)
m.authenticator.ReplaceHashed(snapshot.APIKeys)
m.generation.Store(snapshot.Generation)
m.logger.Info("control_plane_reloaded", "generation", snapshot.Generation, "models", len(snapshot.Models), "api_keys", len(snapshot.APIKeys))
return snapshot.Generation, nil
}
func (m *Manager) AfterMutation(ctx context.Context, generation int64, resource, id string) error {
loadedGeneration, err := m.Reload(ctx)
if err != nil {
return err
}
if !m.store.RedisEnabled() {
return nil
}
if loadedGeneration > generation {
generation = loadedGeneration
}
event := newChange(generation, resource, id)
select {
case m.broadcasts <- event:
default:
m.logger.Warn("control_plane_publish_dropped", "generation", generation, "resource", resource, "id", id, "error", "broadcast queue is full")
}
return nil
}
func (m *Manager) Generation() int64 {
return m.generation.Load()
}
func (m *Manager) RedisConfigured() bool {
return m.store.RedisEnabled()
}
func (m *Manager) RedisConnected() bool {
return m.redisConnected.Load()
}
func (m *Manager) Run(ctx context.Context) {
var workers sync.WaitGroup
if m.store.RedisEnabled() {
workers.Add(2)
go func() {
defer workers.Done()
m.runSubscriptions(ctx)
}()
go func() {
defer workers.Done()
m.runBroadcasts(ctx)
}()
} else {
m.logger.Info("control_plane_redis_disabled", "fallback", "postgres_polling")
}
m.runPolling(ctx)
workers.Wait()
}
func (m *Manager) runPolling(ctx context.Context) {
ticker := time.NewTicker(m.pollInterval)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
generation, err := m.store.DatabaseGeneration(ctx)
if err != nil {
m.logger.Warn("control_plane_generation_check_failed", "error", err)
continue
}
if generation > m.generation.Load() {
if _, err := m.Reload(ctx); err != nil {
m.logger.Error("control_plane_reload_failed", "source", "postgres", "error", err)
}
}
}
}
}
func (m *Manager) runSubscriptions(ctx context.Context) {
retryDelay := m.pollInterval
if retryDelay > time.Second {
retryDelay = time.Second
}
if retryDelay <= 0 {
retryDelay = time.Second
}
for ctx.Err() == nil {
messages, closeSubscription, err := m.store.Subscribe(ctx)
if err != nil {
m.redisConnected.Store(false)
m.logger.Warn("control_plane_subscription_failed", "error", err)
if !waitForRetry(ctx, retryDelay) {
return
}
continue
}
m.redisConnected.Store(true)
m.logger.Info("control_plane_subscription_connected")
closed := false
for !closed {
select {
case <-ctx.Done():
closed = true
case message, ok := <-messages:
if !ok {
closed = true
continue
}
var event ChangeEvent
if json.Unmarshal([]byte(message.Payload), &event) != nil || event.Generation <= m.generation.Load() {
continue
}
if _, err := m.Reload(ctx); err != nil {
m.logger.Error("control_plane_reload_failed", "source", "redis", "error", err)
}
}
}
m.redisConnected.Store(false)
if closeSubscription != nil {
_ = closeSubscription()
}
if ctx.Err() == nil {
m.logger.Warn("control_plane_subscription_disconnected")
if !waitForRetry(ctx, retryDelay) {
return
}
}
}
}
func (m *Manager) runBroadcasts(ctx context.Context) {
for {
select {
case <-ctx.Done():
return
case event := <-m.broadcasts:
publishContext, cancel := context.WithTimeout(ctx, 2*time.Second)
err := m.store.PublishChange(publishContext, event)
cancel()
if err != nil {
m.logger.Warn("control_plane_publish_failed", "generation", event.Generation, "resource", event.Resource, "id", event.ID, "error", err)
}
}
}
}
func waitForRetry(ctx context.Context, delay time.Duration) bool {
timer := time.NewTimer(delay)
defer timer.Stop()
select {
case <-ctx.Done():
return false
case <-timer.C:
return true
}
}
|
