feat: add redis cache and fanout support

server/store/config_cache.go

@@ -0,0 +1,85 @@
+package store
+
+import (
+	"sort"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/tinode/chat/server/store/types"
+)
+
+const configCacheTTL = time.Minute
+
+type configCacheEntry[T any] struct {
+	value     T
+	expiresAt time.Time
+}
+
+type configCache[T any] struct {
+	mu    sync.RWMutex
+	items map[string]configCacheEntry[T]
+}
+
+func newConfigCache[T any]() *configCache[T] {
+	return &configCache[T]{items: make(map[string]configCacheEntry[T])}
+}
+
+func (c *configCache[T]) get(key string) (T, bool) {
+	var zero T
+	c.mu.RLock()
+	entry, ok := c.items[key]
+	c.mu.RUnlock()
+	if !ok || time.Now().After(entry.expiresAt) {
+		return zero, false
+	}
+	return entry.value, true
+}
+
+func (c *configCache[T]) set(key string, value T) {
+	c.mu.Lock()
+	c.items[key] = configCacheEntry[T]{value: value, expiresAt: time.Now().Add(configCacheTTL)}
+	c.mu.Unlock()
+}
+
+var (
+	tenantByCodeCache       = newConfigCache[*types.Tenant]()
+	tenantByIDCache         = newConfigCache[*types.Tenant]()
+	registrationSMSCache    = newConfigCache[bool]()
+	thirdPartyConfigCache   = newConfigCache[map[string]string]()
+	thirdPartyConfigAllKeys = "*"
+)
+
+func cloneTenant(t *types.Tenant) *types.Tenant {
+	if t == nil {
+		return nil
+	}
+	cp := *t
+	return &cp
+}
+
+func cloneStringMap(src map[string]string) map[string]string {
+	if src == nil {
+		return nil
+	}
+	dst := make(map[string]string, len(src))
+	for k, v := range src {
+		dst[k] = v
+	}
+	return dst
+}
+
+func thirdPartyCacheKey(group string, keys ...string) string {
+	group = strings.TrimSpace(group)
+	if len(keys) == 0 {
+		return group + ":" + thirdPartyConfigAllKeys
+	}
+	normalized := make([]string, 0, len(keys))
+	for _, key := range keys {
+		if key = strings.TrimSpace(key); key != "" {
+			normalized = append(normalized, key)
+		}
+	}
+	sort.Strings(normalized)
+	return group + ":" + strings.Join(normalized, ",")
+}