/
pg_redshift_translator.go
138 lines (128 loc) · 4.43 KB
/
pg_redshift_translator.go
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package rdapp
import (
"fmt"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/redshiftdata/types"
wire "github.com/jeroenrinzema/psql-wire"
"github.com/lib/pq/oid"
"go.uber.org/zap"
"strconv"
"strings"
)
type PgRedshiftTranslator interface {
TranslateToRedshiftQuery(pgQuery string) string
TranslateToRedshiftQueryParams(pgParams []string) []types.SqlParameter
TranslateColumnMetaDataToPgFormat(rdappCtx RdappContext, columnMetadata []types.ColumnMetadata) (wire.Columns, error)
TranslateRowToPgFormat(rdappCtx RdappContext, redshiftRow []types.Field) ([]any, error)
}
type pgRedshiftTranslator struct {
}
func NewPgRedshiftTranslator() PgRedshiftTranslator {
return &pgRedshiftTranslator{}
}
func (translator *pgRedshiftTranslator) TranslateToRedshiftQuery(query string) string {
newQuery := strings.ReplaceAll(query, "$", ":")
for i := 1; strings.Contains(newQuery, "?"); i++ {
newQuery = strings.Replace(newQuery, "?", fmt.Sprintf(":%d", i), 1)
}
return newQuery
}
func (translator *pgRedshiftTranslator) TranslateToRedshiftQueryParams(pgParams []string) []types.SqlParameter {
var sqlParameters []types.SqlParameter
for i, parameter := range pgParams {
sqlParameters = append(sqlParameters, types.SqlParameter{
Name: aws.String(strconv.Itoa(i + 1)),
Value: aws.String(parameter),
})
}
return sqlParameters
}
func (translator *pgRedshiftTranslator) TranslateRowToPgFormat(rdappCtx RdappContext, redshiftRow []types.Field) ([]any, error) {
var row []any
for _, recordCol := range redshiftRow {
switch t := recordCol.(type) {
case *types.FieldMemberIsNull:
row = append(row, nil)
case *types.FieldMemberBlobValue:
row = append(row, t.Value)
case *types.FieldMemberBooleanValue:
row = append(row, t.Value)
case *types.FieldMemberDoubleValue:
row = append(row, t.Value)
case *types.FieldMemberLongValue:
row = append(row, t.Value)
case *types.FieldMemberStringValue:
row = append(row, t.Value)
default:
rdappCtx.logger.Error("unknown row column format", zap.Any("recordColType", t))
return nil, fmt.Errorf("unknown row column format %v", t)
}
}
return row, nil
}
func (translator *pgRedshiftTranslator) TranslateColumnMetaDataToPgFormat(rdappCtx RdappContext, columnMetadata []types.ColumnMetadata) (wire.Columns, error) {
var wireColumns wire.Columns
for _, column := range columnMetadata {
postgresType, err := translator.convertRedshiftResultTypeToPostgresType(*column.TypeName, rdappCtx.logger)
if err != nil {
return nil, err
}
wireColumns = append(wireColumns, wire.Column{
Name: *column.Name,
Oid: postgresType,
Width: int16(column.Length),
})
}
return wireColumns, nil
}
const (
RedshiftTypeSuper = "super"
RedshiftTypeBool = "bool"
RedshiftTypeChar = "char"
RedshiftTypeVarchar = "varchar"
RedshiftTypeBpchar = "bpchar"
RedshiftTypeTimestamp = "timestamp"
RedshiftTypeTimestamptz = "timestamptz"
RedshiftTypeFloat4 = "float4"
RedshiftTypeFloat8 = "float8"
RedshiftTypeInt2 = "int2"
RedshiftTypeInt4 = "int4"
RedshiftTypeInt8 = "int8"
RedshiftTypeNumeric = "numeric"
RedshiftTypeName = "name"
RedshiftTypeOid = "oid"
RedshiftTypeAclitem = "_aclitem"
RedshiftTypeText = "_text"
)
func (translator *pgRedshiftTranslator) convertRedshiftResultTypeToPostgresType(redshiftTypeName string, loggerWithContext *zap.Logger) (oid.Oid, error) {
typeConversions := map[string]oid.Oid{
RedshiftTypeSuper: oid.T_json,
RedshiftTypeBool: oid.T_bool,
// Character types
RedshiftTypeChar: oid.T_varchar,
RedshiftTypeVarchar: oid.T_varchar,
RedshiftTypeBpchar: oid.T_bpchar,
RedshiftTypeText: oid.T_text,
// Timestamp types
RedshiftTypeTimestamp: oid.T_timestamp,
RedshiftTypeTimestamptz: oid.T_timestamptz,
// Numeric types
RedshiftTypeFloat4: oid.T_float4,
RedshiftTypeFloat8: oid.T_float8,
RedshiftTypeInt2: oid.T_int2,
RedshiftTypeInt4: oid.T_int4,
RedshiftTypeInt8: oid.T_int8,
RedshiftTypeNumeric: oid.T_numeric,
// Esoteric types
RedshiftTypeName: oid.T_name,
RedshiftTypeOid: oid.T_oid,
RedshiftTypeAclitem: oid.T_aclitem,
}
value, exists := typeConversions[redshiftTypeName]
if !exists {
loggerWithContext.Error("no convertor found for redshift type",
zap.String("redshiftTypeName", redshiftTypeName))
return 0, fmt.Errorf("no convertor found redshiftTypeName=%v", redshiftTypeName)
}
return value, nil
}