Refactor: use InstanceManager for managing ds instances

pkg/datasource/datasource_cache.go

@@ -3,11 +3,9 @@ package datasource
 import (
 	"crypto/sha1"
 	"encoding/hex"
-	"encoding/json"
 	"time"
 
 	"github.com/alexanderzobnin/grafana-zabbix/pkg/cache"
-	"github.com/grafana/grafana-plugin-sdk-go/backend"
 )
 
 // DatasourceCache is a cache for datasource instance.
@@ -40,12 +38,3 @@ func HashString(text string) string {
 	hash.Write([]byte(text))
 	return hex.EncodeToString(hash.Sum(nil))
 }
-
-// HashDatasourceInfo converts the given datasource info to hash string
-func HashDatasourceInfo(dsInfo *backend.DataSourceInstanceSettings) string {
-	digester := sha1.New()
-	if err := json.NewEncoder(digester).Encode(dsInfo); err != nil {
-		panic(err) // This shouldn't be possible but just in case DatasourceInfo changes
-	}
-	return hex.EncodeToString(digester.Sum(nil))
-}