feat: Add response-cache plugin (#3061)

Co-authored-by: mirror58229 <674958229@qq.com>

plugins/wasm-go/extensions/response-cache/config/config.go

@@ -0,0 +1,89 @@
+package config
+
+import (
+	"fmt"
+	"strconv"
+
+	"github.com/alibaba/higress/plugins/wasm-go/extensions/response-cache/cache"
+	"github.com/higress-group/wasm-go/pkg/log"
+	"github.com/tidwall/gjson"
+)
+
+type PluginConfig struct {
+	cacheProvider       cache.Provider
+	cacheProviderConfig cache.ProviderConfig
+
+	CacheKeyFromHeader string
+	CacheKeyFromBody   string
+
+	CacheValueFromBodyType string
+	CacheValueFromBody     string
+
+	CacheResponseCode []int32
+}
+
+func (c *PluginConfig) FromJson(json gjson.Result) {
+	c.cacheProviderConfig.FromJson(json.Get("cache"))
+	c.CacheKeyFromHeader = json.Get("cacheKeyFromHeader").String()
+	c.CacheKeyFromBody = json.Get("cacheKeyFromBody").String()
+
+	c.CacheValueFromBodyType = json.Get("cacheValueFromBodyType").String()
+	if c.CacheValueFromBodyType == "" {
+		c.CacheValueFromBodyType = "application/json"
+	}
+
+	c.CacheValueFromBody = json.Get("cacheValueFromBody").String()
+
+	cacheResponseCode := json.Get("cacheResponseCode").Array()
+	c.CacheResponseCode = make([]int32, 0, len(cacheResponseCode))
+	for _, v := range cacheResponseCode {
+		responseCode, err := strconv.Atoi(v.String())
+		if err != nil || responseCode < 100 || responseCode > 999 {
+			log.Errorf("Skip invalid response_code value: %s", v.String())
+			return
+		}
+		c.CacheResponseCode = append(c.CacheResponseCode, int32(responseCode))
+	}
+
+	if len(c.CacheResponseCode) == 0 {
+		c.CacheResponseCode = []int32{200}
+	}
+}
+
+func (c *PluginConfig) Validate() error {
+	// cache cannot be empty
+	if c.cacheProviderConfig.GetProviderType() == "" {
+		return fmt.Errorf("cache provider cannot be empty")
+	}
+
+	// if cache provider is configured, validate it
+	if c.cacheProviderConfig.GetProviderType() != "" {
+		if err := c.cacheProviderConfig.Validate(); err != nil {
+			return err
+		}
+	}
+
+	// cache key cannot be all set
+	if c.CacheKeyFromHeader != "" && c.CacheKeyFromBody != "" {
+		return fmt.Errorf("cacheKeyFromHeader and cacheKeyFromBody cannot be all set")
+	}
+	return nil
+}
+func (c *PluginConfig) Complete() error {
+	var err error
+	if c.cacheProviderConfig.GetProviderType() != "" {
+		log.Debugf("cache provider is set to %s", c.cacheProviderConfig.GetProviderType())
+		c.cacheProvider, err = cache.CreateProvider(c.cacheProviderConfig)
+		if err != nil {
+			return err
+		}
+	} else {
+		log.Info("cache provider is not configured")
+		c.cacheProvider = nil
+	}
+	return nil
+}
+
+func (c *PluginConfig) GetCacheProvider() cache.Provider {
+	return c.cacheProvider
+}