Refactor: zabbix client

pkg/zabbix/cache.go

@@ -0,0 +1,55 @@
+package zabbix
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"time"
+
+	"github.com/alexanderzobnin/grafana-zabbix/pkg/cache"
+)
+
+var cachedMethods = map[string]bool{
+	"hostgroup.get":   true,
+	"host.get":        true,
+	"application.get": true,
+	"item.get":        true,
+	"service.get":     true,
+	"usermacro.get":   true,
+	"proxy.get":       true,
+}
+
+func IsCachedRequest(method string) bool {
+	_, ok := cachedMethods[method]
+	return ok
+}
+
+// ZabbixCache is a cache for datasource instance.
+type ZabbixCache struct {
+	cache *cache.Cache
+}
+
+// NewZabbixCache creates a DatasourceCache with expiration(ttl) time and cleanupInterval.
+func NewZabbixCache(ttl time.Duration, cleanupInterval time.Duration) *ZabbixCache {
+	return &ZabbixCache{
+		cache.NewCache(ttl, cleanupInterval),
+	}
+}
+
+// GetAPIRequest gets request response from cache
+func (c *ZabbixCache) GetAPIRequest(request *ZabbixAPIRequest) (interface{}, bool) {
+	requestHash := HashString(request.String())
+	return c.cache.Get(requestHash)
+}
+
+// SetAPIRequest writes request response to cache
+func (c *ZabbixCache) SetAPIRequest(request *ZabbixAPIRequest, response interface{}) {
+	requestHash := HashString(request.String())
+	c.cache.Set(requestHash, response)
+}
+
+// HashString converts the given text string to hash string
+func HashString(text string) string {
+	hash := sha1.New()
+	hash.Write([]byte(text))
+	return hex.EncodeToString(hash.Sum(nil))
+}