forked from omniscale/imposm3
/
tx.go
199 lines (170 loc) · 3.51 KB
/
tx.go
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package postgis
import (
"database/sql"
"fmt"
"sync"
"github.com/omniscale/imposm3/log"
)
type TableTx interface {
Begin(*sql.Tx) error
Insert(row []interface{}) error
Delete(id int64) error
End()
Commit() error
Rollback()
}
type bulkTableTx struct {
Pg *PostGIS
Tx *sql.Tx
Table string
Spec *TableSpec
InsertStmt *sql.Stmt
InsertSQL string
wg *sync.WaitGroup
rows chan []interface{}
}
func NewBulkTableTx(pg *PostGIS, spec *TableSpec) TableTx {
tt := &bulkTableTx{
Pg: pg,
Table: spec.FullName,
Spec: spec,
wg: &sync.WaitGroup{},
rows: make(chan []interface{}, 64),
}
tt.wg.Add(1)
go tt.loop()
return tt
}
func (tt *bulkTableTx) Begin(tx *sql.Tx) error {
var err error
if tx == nil {
tx, err = tt.Pg.Db.Begin()
if err != nil {
return err
}
}
tt.Tx = tx
_, err = tx.Exec(fmt.Sprintf(`TRUNCATE TABLE "%s"."%s" RESTART IDENTITY`, tt.Pg.Config.ImportSchema, tt.Table))
if err != nil {
return err
}
tt.InsertSQL = tt.Spec.CopySQL()
stmt, err := tt.Tx.Prepare(tt.InsertSQL)
if err != nil {
return &SQLError{tt.InsertSQL, err}
}
tt.InsertStmt = stmt
return nil
}
func (tt *bulkTableTx) Insert(row []interface{}) error {
tt.rows <- row
return nil
}
func (tt *bulkTableTx) loop() {
for row := range tt.rows {
_, err := tt.InsertStmt.Exec(row...)
if err != nil {
// InsertStmt uses COPY so the error may not be related to this row.
// Abort the import as the whole transaction is lost anyway.
log.Fatalf("[fatal] bulk insert into %q: %s", tt.Table, &SQLError{tt.InsertSQL, err})
}
}
tt.wg.Done()
}
func (tt *bulkTableTx) Delete(id int64) error {
panic("unable to delete in bulkImport mode")
}
func (tt *bulkTableTx) End() {
close(tt.rows)
tt.wg.Wait()
}
func (tt *bulkTableTx) Commit() error {
tt.End()
if tt.InsertStmt != nil {
_, err := tt.InsertStmt.Exec()
if err != nil {
return err
}
}
err := tt.Tx.Commit()
if err != nil {
return err
}
tt.Tx = nil
return nil
}
func (tt *bulkTableTx) Rollback() {
rollbackIfTx(&tt.Tx)
}
type syncTableTx struct {
Pg *PostGIS
Tx *sql.Tx
Table string
Spec tableSpec
InsertStmt *sql.Stmt
DeleteStmt *sql.Stmt
InsertSQL string
DeleteSQL string
}
type tableSpec interface {
InsertSQL() string
DeleteSQL() string
}
func NewSynchronousTableTx(pg *PostGIS, tableName string, spec tableSpec) TableTx {
tt := &syncTableTx{
Pg: pg,
Table: tableName,
Spec: spec,
}
return tt
}
func (tt *syncTableTx) Begin(tx *sql.Tx) error {
var err error
if tx == nil {
tx, err = tt.Pg.Db.Begin()
if err != nil {
return err
}
}
tt.Tx = tx
tt.InsertSQL = tt.Spec.InsertSQL()
stmt, err := tt.Tx.Prepare(tt.InsertSQL)
if err != nil {
return &SQLError{tt.InsertSQL, err}
}
tt.InsertStmt = stmt
tt.DeleteSQL = tt.Spec.DeleteSQL()
stmt, err = tt.Tx.Prepare(tt.DeleteSQL)
if err != nil {
return &SQLError{tt.DeleteSQL, err}
}
tt.DeleteStmt = stmt
return nil
}
func (tt *syncTableTx) Insert(row []interface{}) error {
_, err := tt.InsertStmt.Exec(row...)
if err != nil {
return &SQLInsertError{SQLError{tt.InsertSQL, err}, row}
}
return nil
}
func (tt *syncTableTx) Delete(id int64) error {
_, err := tt.DeleteStmt.Exec(id)
if err != nil {
return &SQLInsertError{SQLError{tt.DeleteSQL, err}, id}
}
return nil
}
func (tt *syncTableTx) End() {
}
func (tt *syncTableTx) Commit() error {
err := tt.Tx.Commit()
if err != nil {
return err
}
tt.Tx = nil
return nil
}
func (tt *syncTableTx) Rollback() {
rollbackIfTx(&tt.Tx)
}