blog_backend_api/db/elasticEngine.go

package db

import (

	"github.com/pkg/errors"
	"gopkg.in/olivere/elastic.v3"
	"qiniupkg.com/x/log.v7"
	"reflect"
)
const(
	ERROR_PTR = "nullpointer error"
	INPUT_TYPE_ERROR = "wrong input parameter"
	CREATED_ERROR = "create error"
	DELETE_ERROR = "delete error"

)
type  ElkEngine struct {
	cli *elastic.Client
}



func (p *ElkEngine)Create(index string,types string,id string,data interface{}) (error)  {
	if nil != p{
		if (reflect.TypeOf(data).Kind() == reflect.String)  || (reflect.TypeOf(data).Kind() == reflect.Struct){
			resp, err := p.cli.Index().
				Index(index).
				Type(types).
				BodyJson(data).
				Do()
			if !resp.Created{
				return errors.New(CREATED_ERROR)
			}
			if err != nil {
				log.Print(err)
				return err
			}
		}else{
			log.Print(reflect.TypeOf(data).Kind())
			return errors.New(INPUT_TYPE_ERROR)
		}
	}else{
		return errors.New(ERROR_PTR)
	}
	return nil
}

func (p *ElkEngine)Delete(index string,types string,id string) error{
	if nil != p{
		res, err := p.cli.Delete().Index(index).
			Type(types).
			Id(id).
			Do()
		if err != nil {
			print(err)
			return  err
		}
		if !res.Found{
			return errors.New(DELETE_ERROR)
		}
	}else{
		return errors.New(ERROR_PTR)
	}
	return nil
}
/*

*/
func (p *ElkEngine)Query(index string,types string,query elastic.Query,data interface{}) ([]interface{},error) {
	if nil != p{
		res, err := p.cli.
			Search(index).
			Type(types).
			Query(query).
			Do()
		if err != nil {
			print(err)
			return  nil,err
		}
		//var typ Employee
		typ := reflect.TypeOf(data)
		return  res.Each(typ),nil
	}else{
		return nil,errors.New(ERROR_PTR)
	}
}

func (p *ElkEngine)Update(index string,types string,id string,data map[string]interface{}) error {
	if nil != p {
		_, err := p.cli.Update().
			Index(index).
			Type(types).
			Id(id).
			Doc(data).
			Do()
		if err != nil {
			println(err.Error())
			return err
		}
	}
	return errors.New(ERROR_PTR)
}

// 创建 elasticSearch 的 Mapping
func (p *ElkEngine)InitMapping(esIndexName string, esTypeName string, typeMapping string) error{
	var err error
	exists, err := p.cli.IndexExists(esIndexName).Do()
	if err != nil {
		log.Println("IndexExists" + err.Error())
		return err
	}
	//log.Println("es index: " + esIndexName)
	//log.Println("es type: " + esTypeName)
	//log.Println("es index mapping: " + indexMapping)
	//log.Println("es type mapping: " + typeMapping)
	if !exists {
		log.Println("es index not exists: " + esIndexName)
		// Create a new index.
		createIndex, err := p.cli.CreateIndex(esIndexName).Body(typeMapping).Do()
		if err != nil {
			log.Println("CreateIndex" + err.Error())
			return err
		}
		if !createIndex.Acknowledged {
			// Not acknowledged
			return errors.New("create index:" + esIndexName + ", not Ack nowledged")
		}
	}
	/**
	  * 判断 type 是否存在
	     exists, err = client.TypeExists().Index(esIndexName).Type(esTypeName).Do(ctx)
	     if err != nil {
	         return err
	     }
	     if !exists {

	     }
	*/
	// PutMapping() *IndicesPutMappingService

	putresp, err := p.cli.PutMapping().Index(esIndexName).Type(esTypeName).BodyString(typeMapping).Do()
	// 新建 mapping
	//indicesCreateResult, err := elastic.NewIndicesCreateService(client).Index(esIndexName).BodyString(mapping).Do(ctx)
	if err != nil {
		log.Println("NewIndicesCreateService" + err.Error())
		return err
	}
	if !putresp.Acknowledged {
		// Not acknowledged
		return errors.New("create mapping fail, esIndexName:" + esIndexName + ", esTypeName:" + esTypeName + ", not Ack nowledged")
	}


	return err
}