[WIP] logging refactor (#1794)

* refactor logging

Signed-off-by: huanggze <loganhuang@yunify.com>

* refactor logging

Signed-off-by: huanggze <loganhuang@yunify.com>

pkg/simple/client/logging/elasticsearch/versions/v6/v6.go

@@ -0,0 +1,88 @@
+package v6
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"github.com/elastic/go-elasticsearch/v6"
+	"github.com/elastic/go-elasticsearch/v6/esapi"
+	"io/ioutil"
+	"k8s.io/klog"
+	"time"
+)
+
+type Elastic struct {
+	Client *elasticsearch.Client
+	index  string
+}
+
+func New(address string, index string) *Elastic {
+	client, err := elasticsearch.NewClient(elasticsearch.Config{
+		Addresses: []string{address},
+	})
+	if err != nil {
+		klog.Error(err)
+		return nil
+	}
+
+	return &Elastic{Client: client, index: index}
+}
+
+func (e *Elastic) Search(body []byte) ([]byte, error) {
+	response, err := e.Client.Search(
+		e.Client.Search.WithContext(context.Background()),
+		e.Client.Search.WithIndex(fmt.Sprintf("%s*", e.index)),
+		e.Client.Search.WithBody(bytes.NewBuffer(body)),
+		e.Client.Search.WithScroll(time.Minute))
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	if response.IsError() {
+		return nil, parseError(response)
+	}
+
+	return ioutil.ReadAll(response.Body)
+}
+
+func (e *Elastic) Scroll(id string) ([]byte, error) {
+	response, err := e.Client.Scroll(
+		e.Client.Scroll.WithContext(context.Background()),
+		e.Client.Scroll.WithScrollID(id),
+		e.Client.Scroll.WithScroll(time.Minute))
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	if response.IsError() {
+		return nil, parseError(response)
+	}
+
+	return ioutil.ReadAll(response.Body)
+}
+
+func (e *Elastic) ClearScroll(scrollId string) {
+	response, _ := e.Client.ClearScroll(
+		e.Client.ClearScroll.WithContext(context.Background()),
+		e.Client.ClearScroll.WithScrollID(scrollId))
+	defer response.Body.Close()
+}
+
+func (e *Elastic) GetTotalHitCount(v interface{}) int64 {
+	f, _ := v.(float64)
+	return int64(f)
+}
+
+func parseError(response *esapi.Response) error {
+	var e map[string]interface{}
+	if err := json.NewDecoder(response.Body).Decode(&e); err != nil {
+		return err
+	} else {
+		// Print the response status and error information.
+		e, _ := e["error"].(map[string]interface{})
+		return fmt.Errorf("type: %v, reason: %v", e["type"], e["reason"])
+	}
+}