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postlayer.go
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postlayer.go
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package layers
import (
"context"
"database/sql"
"database/sql/driver"
"errors"
"fmt"
"github.com/mimiro-io/oracle-datalayer/internal/conf"
go_ora "github.com/sijms/go-ora/v2"
"go.uber.org/fx"
"go.uber.org/zap"
"sort"
"strings"
)
type PostLayer struct {
cmgr *conf.ConfigurationManager //
logger *zap.SugaredLogger
PostRepo *PostRepository //exported because it needs to deferred from main??
}
type PostRepository struct {
DB *sql.DB
ctx context.Context
postTableDef *conf.PostMapping
digest [16]byte
}
func NewPostLayer(lc fx.Lifecycle, cmgr *conf.ConfigurationManager, logger *zap.SugaredLogger) *PostLayer {
postLayer := &PostLayer{logger: logger.Named("layer")}
postLayer.cmgr = cmgr
postLayer.PostRepo = &PostRepository{
ctx: context.Background(),
}
lc.Append(fx.Hook{
OnStop: func(ctx context.Context) error {
if postLayer.PostRepo.DB != nil {
postLayer.PostRepo.DB.Close()
}
return nil
},
})
return postLayer
}
func (postLayer *PostLayer) connect(table *conf.PostMapping) (*sql.DB, error) {
//test with pure sql
u := postLayer.cmgr.Datalayer.GetPostUrl(table)
db, err := sql.Open("oracle", u)
if err != nil {
postLayer.logger.Warn("Error creating connection: ", err.Error())
return nil, err
}
err = db.PingContext(postLayer.PostRepo.ctx)
if err != nil {
postLayer.logger.Warn(err.Error())
return nil, err
}
return db, nil
}
func (postLayer *PostLayer) PostEntities(datasetName string, entities []*Entity) error {
postLayer.PostRepo.postTableDef = postLayer.GetTableDefinition(datasetName)
if postLayer.PostRepo.postTableDef == nil {
return errors.New(fmt.Sprintf("No configuration found for dataset: %s", datasetName))
}
connString := postLayer.getConnString(postLayer.PostRepo.postTableDef)
conn, err := go_ora.NewConnection(connString)
if err != nil {
return err
}
err = conn.Open()
if err != nil {
return err
}
defer func() {
err = conn.Close()
if err != nil {
postLayer.logger.Warnf("Unable to close connection: %s", err)
}
}()
query := postLayer.PostRepo.postTableDef.Query
if query == "" {
postLayer.logger.Errorf("Please add query in config for %s in ", datasetName)
return errors.New(fmt.Sprintf("no query found in config for dataset: %s", datasetName))
}
//postLayer.logger.Debug(query)
// requires idColumn to be the first in sortOrder
queryDel := fmt.Sprintf(`DELETE FROM %s WHERE %s = :1`, strings.ToLower(postLayer.PostRepo.postTableDef.TableName), strings.ToLower(postLayer.PostRepo.postTableDef.IdColumn))
//postLayer.logger.Debug(queryDel)
fields := postLayer.PostRepo.postTableDef.FieldMappings
if len(fields) == 0 {
postLayer.logger.Errorf("Please define all fields in config that is involved in dataset %s and query: %s", datasetName, query)
return errors.New("fields needs to be defined in the configuration")
}
//Only Sort Fields if SortOrder is set
count := 0
for _, field := range fields {
if field.SortOrder == 0 {
count++
}
}
if count >= 2 {
postLayer.logger.Warn("No sort order is defined for fields in config, this might corrupt the query")
} else {
sort.SliceStable(fields, func(i, j int) bool {
return fields[i].SortOrder < fields[j].SortOrder
})
}
//BULKINSERT
//TODO: Get proper batching in here bulkInsert seems to have som bugs as of 18/08/2022
/* rowNum := batchSize
payload := make(map[string][]driver.Value)
for _, field := range fields {
payload[field.FieldName] = make([]driver.Value, 0)
}*/
args := make([]driver.Value, len(fields))
for _, entity := range entities {
s := entity.StripProps()
//insert the values of each Field in an array in payload with the correct FieldName BULKINSERT
//TODO: Get proper batching in here bulkInsert seems to have som bugs as of 18/08/2022
/* for _, field := range fields {
// fieldName := make([]driver.Value, rowNum)
payload[field.FieldName] = append(payload[field.FieldName], s[field.FieldName])
}*/
for i, field := range fields {
args[i] = s[field.FieldName]
}
if !entity.IsDeleted { //If is deleted True --> Do not store
_, err := conn.Exec(query, args...)
if err != nil {
postLayer.logger.Error(err)
return err
}
} else { //Should be deleted if it exists
_, err := conn.Exec(queryDel, args[0])
if err != nil {
postLayer.logger.Error(err)
return err
}
}
}
return nil
}
//BULKINSERT
//TODO: Get proper batching in here bulkInsert seems to have som bugs as of 18/08/2022
/*var columns [][]driver.Value
for _, field := range fields {
columns = append(columns, payload[field.FieldName])
}
result, err := conn.BulkInsert(query, 5, columns...)
if err != nil {
return err
}
rowsAffected, _ := result.RowsAffected()
fmt.Printf("%v rows inserted\n", rowsAffected)
return nil
}*/
func (postLayer *PostLayer) getConnString(table *conf.PostMapping) string {
connString := postLayer.cmgr.Datalayer.GetPostUrl(table)
return connString
}
func (postLayer *PostLayer) GetTableDefinition(datasetName string) *conf.PostMapping {
for _, table := range postLayer.cmgr.Datalayer.PostMappings {
if table.DatasetName == datasetName {
return table
} else if table.TableName == datasetName { // fallback
return table
}
}
return nil
}