feat: improve perf by caching proxy and layers locally

internal/proxy/director/director.go

@@ -7,6 +7,7 @@ import (
 
 	"forge.cadoles.com/Cadoles/go-proxy"
 	"forge.cadoles.com/Cadoles/go-proxy/wildcard"
+	"forge.cadoles.com/cadoles/bouncer/internal/cache"
 	"forge.cadoles.com/cadoles/bouncer/internal/store"
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
@@ -17,6 +18,9 @@ type Director struct {
 	proxyRepository store.ProxyRepository
 	layerRepository store.LayerRepository
 	layerRegistry   *LayerRegistry
+
+	proxyCache cache.Cache[string, []*store.Proxy]
+	layerCache cache.Cache[string, []*store.Layer]
 }
 
 func (d *Director) rewriteRequest(r *http.Request) (*http.Request, error) {
@@ -88,7 +92,14 @@ MAIN:
 	return r, nil
 }
 
+const proxiesCacheKey = "proxies"
+
 func (d *Director) getProxies(ctx context.Context) ([]*store.Proxy, error) {
+	proxies, exists := d.proxyCache.Get(proxiesCacheKey)
+	if exists {
+		return proxies, nil
+	}
+
 	headers, err := d.proxyRepository.QueryProxy(ctx, store.WithProxyQueryEnabled(true))
 	if err != nil {
 		return nil, errors.WithStack(err)
@@ -96,7 +107,7 @@ func (d *Director) getProxies(ctx context.Context) ([]*store.Proxy, error) {
 
 	sort.Sort(store.ByProxyWeight(headers))
 
-	proxies := make([]*store.Proxy, 0, len(headers))
+	proxies = make([]*store.Proxy, 0, len(headers))
 
 	for _, h := range headers {
 		if !h.Enabled {
@@ -111,10 +122,19 @@ func (d *Director) getProxies(ctx context.Context) ([]*store.Proxy, error) {
 		proxies = append(proxies, proxy)
 	}
 
+	d.proxyCache.Set(proxiesCacheKey, proxies)
+
 	return proxies, nil
 }
 
 func (d *Director) getLayers(ctx context.Context, proxyName store.ProxyName) ([]*store.Layer, error) {
+	cacheKey := "layers-" + string(proxyName)
+
+	layers, exists := d.layerCache.Get(cacheKey)
+	if exists {
+		return layers, nil
+	}
+
 	headers, err := d.layerRepository.QueryLayers(ctx, proxyName, store.WithLayerQueryEnabled(true))
 	if err != nil {
 		return nil, errors.WithStack(err)
@@ -122,7 +142,7 @@ func (d *Director) getLayers(ctx context.Context, proxyName store.ProxyName) ([]
 
 	sort.Sort(store.ByLayerWeight(headers))
 
-	layers := make([]*store.Layer, 0, len(headers))
+	layers = make([]*store.Layer, 0, len(headers))
 
 	for _, h := range headers {
 		if !h.Enabled {
@@ -137,6 +157,8 @@ func (d *Director) getLayers(ctx context.Context, proxyName store.ProxyName) ([]
 		layers = append(layers, layer)
 	}
 
+	d.layerCache.Set(cacheKey, layers)
+
 	return layers, nil
 }
 
@@ -240,8 +262,16 @@ func (d *Director) Middleware() proxy.Middleware {
 	}
 }
 
-func New(proxyRepository store.ProxyRepository, layerRepository store.LayerRepository, layers ...Layer) *Director {
-	registry := NewLayerRegistry(layers...)
+func New(proxyRepository store.ProxyRepository, layerRepository store.LayerRepository, funcs ...OptionFunc) *Director {
+	opts := NewOptions(funcs...)
 
-	return &Director{proxyRepository, layerRepository, registry}
+	registry := NewLayerRegistry(opts.Layers...)
+
+	return &Director{
+		proxyRepository: proxyRepository,
+		layerRepository: layerRepository,
+		layerRegistry:   registry,
+		proxyCache:      opts.ProxyCache,
+		layerCache:      opts.LayerCache,
+	}
 }