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package pgx
import (
"database/sql/driver"
"fmt"
"math"
"reflect"
"time"
"github.com/jackc/pgio"
"github.com/jackc/pgtype"
)
// PostgreSQL format codes
const (
TextFormatCode = 0
BinaryFormatCode = 1
)
// SerializationError occurs on failure to encode or decode a value
type SerializationError string
func (e SerializationError) Error() string {
return string(e)
}
func convertSimpleArgument(ci *pgtype.ConnInfo, arg interface{}) (interface{}, error) {
if arg == nil {
return nil, nil
}
refVal := reflect.ValueOf(arg)
if refVal.Kind() == reflect.Ptr && refVal.IsNil() {
return nil, nil
}
switch arg := arg.(type) {
// https://github.com/jackc/pgx/issues/409 Changed JSON and JSONB to surface
// []byte to database/sql instead of string. But that caused problems with the
// simple protocol because the driver.Valuer case got taken before the
// pgtype.TextEncoder case. And driver.Valuer needed to be first in the usual
// case because of https://github.com/jackc/pgx/issues/339. So instead we
// special case JSON and JSONB.
case *pgtype.JSON:
buf, err := arg.EncodeText(ci, nil)
if err != nil {
return nil, err
}
if buf == nil {
return nil, nil
}
return string(buf), nil
case *pgtype.JSONB:
buf, err := arg.EncodeText(ci, nil)
if err != nil {
return nil, err
}
if buf == nil {
return nil, nil
}
return string(buf), nil
case driver.Valuer:
return callValuerValue(arg)
case pgtype.TextEncoder:
buf, err := arg.EncodeText(ci, nil)
if err != nil {
return nil, err
}
if buf == nil {
return nil, nil
}
return string(buf), nil
case float32:
return float64(arg), nil
case float64:
return arg, nil
case bool:
return arg, nil
case time.Duration:
return fmt.Sprintf("%d microsecond", int64(arg)/1000), nil
case time.Time:
return arg, nil
case string:
return arg, nil
case []byte:
return arg, nil
case int8:
return int64(arg), nil
case int16:
return int64(arg), nil
case int32:
return int64(arg), nil
case int64:
return arg, nil
case int:
return int64(arg), nil
case uint8:
return int64(arg), nil
case uint16:
return int64(arg), nil
case uint32:
return int64(arg), nil
case uint64:
if arg > math.MaxInt64 {
return nil, fmt.Errorf("arg too big for int64: %v", arg)
}
return int64(arg), nil
case uint:
if uint64(arg) > math.MaxInt64 {
return nil, fmt.Errorf("arg too big for int64: %v", arg)
}
return int64(arg), nil
}
if dt, found := ci.DataTypeForValue(arg); found {
v := dt.Value
err := v.Set(arg)
if err != nil {
return nil, err
}
buf, err := v.(pgtype.TextEncoder).EncodeText(ci, nil)
if err != nil {
return nil, err
}
if buf == nil {
return nil, nil
}
return string(buf), nil
}
if refVal.Kind() == reflect.Ptr {
arg = refVal.Elem().Interface()
return convertSimpleArgument(ci, arg)
}
if strippedArg, ok := stripNamedType(&refVal); ok {
return convertSimpleArgument(ci, strippedArg)
}
return nil, SerializationError(fmt.Sprintf("Cannot encode %T in simple protocol - %T must implement driver.Valuer, pgtype.TextEncoder, or be a native type", arg, arg))
}
func encodePreparedStatementArgument(ci *pgtype.ConnInfo, buf []byte, oid uint32, arg interface{}) ([]byte, error) {
if arg == nil {
return pgio.AppendInt32(buf, -1), nil
}
switch arg := arg.(type) {
case pgtype.BinaryEncoder:
sp := len(buf)
buf = pgio.AppendInt32(buf, -1)
argBuf, err := arg.EncodeBinary(ci, buf)
if err != nil {
return nil, err
}
if argBuf != nil {
buf = argBuf
pgio.SetInt32(buf[sp:], int32(len(buf[sp:])-4))
}
return buf, nil
case pgtype.TextEncoder:
sp := len(buf)
buf = pgio.AppendInt32(buf, -1)
argBuf, err := arg.EncodeText(ci, buf)
if err != nil {
return nil, err
}
if argBuf != nil {
buf = argBuf
pgio.SetInt32(buf[sp:], int32(len(buf[sp:])-4))
}
return buf, nil
case string:
buf = pgio.AppendInt32(buf, int32(len(arg)))
buf = append(buf, arg...)
return buf, nil
}
refVal := reflect.ValueOf(arg)
if refVal.Kind() == reflect.Ptr {
if refVal.IsNil() {
return pgio.AppendInt32(buf, -1), nil
}
arg = refVal.Elem().Interface()
return encodePreparedStatementArgument(ci, buf, oid, arg)
}
if dt, ok := ci.DataTypeForOID(oid); ok {
value := dt.Value
err := value.Set(arg)
if err != nil {
{
if arg, ok := arg.(driver.Valuer); ok {
v, err := callValuerValue(arg)
if err != nil {
return nil, err
}
return encodePreparedStatementArgument(ci, buf, oid, v)
}
}
return nil, err
}
sp := len(buf)
buf = pgio.AppendInt32(buf, -1)
argBuf, err := value.(pgtype.BinaryEncoder).EncodeBinary(ci, buf)
if err != nil {
return nil, err
}
if argBuf != nil {
buf = argBuf
pgio.SetInt32(buf[sp:], int32(len(buf[sp:])-4))
}
return buf, nil
}
if strippedArg, ok := stripNamedType(&refVal); ok {
return encodePreparedStatementArgument(ci, buf, oid, strippedArg)
}
return nil, SerializationError(fmt.Sprintf("Cannot encode %T into oid %v - %T must implement Encoder or be converted to a string", arg, oid, arg))
}
// chooseParameterFormatCode determines the correct format code for an
// argument to a prepared statement. It defaults to TextFormatCode if no
// determination can be made.
func chooseParameterFormatCode(ci *pgtype.ConnInfo, oid uint32, arg interface{}) int16 {
switch arg := arg.(type) {
case pgtype.ParamFormatPreferrer:
return arg.PreferredParamFormat()
case pgtype.BinaryEncoder:
return BinaryFormatCode
case string, *string, pgtype.TextEncoder:
return TextFormatCode
}
return ci.ParamFormatCodeForOID(oid)
}
func stripNamedType(val *reflect.Value) (interface{}, bool) {
switch val.Kind() {
case reflect.Int:
convVal := int(val.Int())
return convVal, reflect.TypeOf(convVal) != val.Type()
case reflect.Int8:
convVal := int8(val.Int())
return convVal, reflect.TypeOf(convVal) != val.Type()
case reflect.Int16:
convVal := int16(val.Int())
return convVal, reflect.TypeOf(convVal) != val.Type()
case reflect.Int32:
convVal := int32(val.Int())
return convVal, reflect.TypeOf(convVal) != val.Type()
case reflect.Int64:
convVal := int64(val.Int())
return convVal, reflect.TypeOf(convVal) != val.Type()
case reflect.Uint:
convVal := uint(val.Uint())
return convVal, reflect.TypeOf(convVal) != val.Type()
case reflect.Uint8:
convVal := uint8(val.Uint())
return convVal, reflect.TypeOf(convVal) != val.Type()
case reflect.Uint16:
convVal := uint16(val.Uint())
return convVal, reflect.TypeOf(convVal) != val.Type()
case reflect.Uint32:
convVal := uint32(val.Uint())
return convVal, reflect.TypeOf(convVal) != val.Type()
case reflect.Uint64:
convVal := uint64(val.Uint())
return convVal, reflect.TypeOf(convVal) != val.Type()
case reflect.String:
convVal := val.String()
return convVal, reflect.TypeOf(convVal) != val.Type()
}
return nil, false
}
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