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Copy pathmessages.go
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213 lines (185 loc) · 5.42 KB
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Copy pathmessages.go
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213 lines (185 loc) · 5.42 KB
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package pgx
import (
"math"
"reflect"
"time"
"github.com/jackc/pgx/pgio"
"github.com/jackc/pgx/pgtype"
)
const (
copyData = 'd'
copyFail = 'f'
copyDone = 'c'
varHeaderSize = 4
)
type FieldDescription struct {
Name string
Table pgtype.OID
AttributeNumber uint16
DataType pgtype.OID
DataTypeSize int16
DataTypeName string
Modifier uint32
FormatCode int16
}
func (fd FieldDescription) Length() (int64, bool) {
switch fd.DataType {
case pgtype.TextOID, pgtype.ByteaOID:
return math.MaxInt64, true
case pgtype.VarcharOID, pgtype.BPCharArrayOID:
return int64(fd.Modifier - varHeaderSize), true
default:
return 0, false
}
}
func (fd FieldDescription) PrecisionScale() (precision, scale int64, ok bool) {
switch fd.DataType {
case pgtype.NumericOID:
mod := fd.Modifier - varHeaderSize
precision = int64((mod >> 16) & 0xffff)
scale = int64(mod & 0xffff)
return precision, scale, true
default:
return 0, 0, false
}
}
func (fd FieldDescription) Type() reflect.Type {
switch fd.DataType {
case pgtype.Int8OID:
return reflect.TypeOf(int64(0))
case pgtype.Int4OID:
return reflect.TypeOf(int32(0))
case pgtype.Int2OID:
return reflect.TypeOf(int16(0))
case pgtype.VarcharOID, pgtype.BPCharArrayOID, pgtype.TextOID:
return reflect.TypeOf("")
case pgtype.BoolOID:
return reflect.TypeOf(false)
case pgtype.NumericOID:
return reflect.TypeOf(float64(0))
case pgtype.DateOID, pgtype.TimestampOID, pgtype.TimestamptzOID:
return reflect.TypeOf(time.Time{})
case pgtype.ByteaOID:
return reflect.TypeOf([]byte(nil))
default:
return reflect.TypeOf(new(interface{})).Elem()
}
}
// PgError represents an error reported by the PostgreSQL server. See
// http://www.postgresql.org/docs/9.3/static/protocol-error-fields.html for
// detailed field description.
type PgError struct {
Severity string
Code string
Message string
Detail string
Hint string
Position int32
InternalPosition int32
InternalQuery string
Where string
SchemaName string
TableName string
ColumnName string
DataTypeName string
ConstraintName string
File string
Line int32
Routine string
}
func (pe PgError) Error() string {
return pe.Severity + ": " + pe.Message + " (SQLSTATE " + pe.Code + ")"
}
// Notice represents a notice response message reported by the PostgreSQL
// server. Be aware that this is distinct from LISTEN/NOTIFY notification.
type Notice PgError
// appendParse appends a PostgreSQL wire protocol parse message to buf and returns it.
func appendParse(buf []byte, name string, query string, parameterOIDs []pgtype.OID) []byte {
buf = append(buf, 'P')
sp := len(buf)
buf = pgio.AppendInt32(buf, -1)
buf = append(buf, name...)
buf = append(buf, 0)
buf = append(buf, query...)
buf = append(buf, 0)
buf = pgio.AppendInt16(buf, int16(len(parameterOIDs)))
for _, oid := range parameterOIDs {
buf = pgio.AppendUint32(buf, uint32(oid))
}
pgio.SetInt32(buf[sp:], int32(len(buf[sp:])))
return buf
}
// appendDescribe appends a PostgreSQL wire protocol describe message to buf and returns it.
func appendDescribe(buf []byte, objectType byte, name string) []byte {
buf = append(buf, 'D')
sp := len(buf)
buf = pgio.AppendInt32(buf, -1)
buf = append(buf, objectType)
buf = append(buf, name...)
buf = append(buf, 0)
pgio.SetInt32(buf[sp:], int32(len(buf[sp:])))
return buf
}
// appendSync appends a PostgreSQL wire protocol sync message to buf and returns it.
func appendSync(buf []byte) []byte {
buf = append(buf, 'S')
buf = pgio.AppendInt32(buf, 4)
return buf
}
// appendBind appends a PostgreSQL wire protocol bind message to buf and returns it.
func appendBind(
buf []byte,
destinationPortal,
preparedStatement string,
connInfo *pgtype.ConnInfo,
parameterOIDs []pgtype.OID,
arguments []interface{},
resultFormatCodes []int16,
) ([]byte, error) {
buf = append(buf, 'B')
sp := len(buf)
buf = pgio.AppendInt32(buf, -1)
buf = append(buf, destinationPortal...)
buf = append(buf, 0)
buf = append(buf, preparedStatement...)
buf = append(buf, 0)
buf = pgio.AppendInt16(buf, int16(len(parameterOIDs)))
for i, oid := range parameterOIDs {
buf = pgio.AppendInt16(buf, chooseParameterFormatCode(connInfo, oid, arguments[i]))
}
buf = pgio.AppendInt16(buf, int16(len(arguments)))
for i, oid := range parameterOIDs {
var err error
buf, err = encodePreparedStatementArgument(connInfo, buf, oid, arguments[i])
if err != nil {
return nil, err
}
}
buf = pgio.AppendInt16(buf, int16(len(resultFormatCodes)))
for _, fc := range resultFormatCodes {
buf = pgio.AppendInt16(buf, fc)
}
pgio.SetInt32(buf[sp:], int32(len(buf[sp:])))
return buf, nil
}
// appendExecute appends a PostgreSQL wire protocol execute message to buf and returns it.
func appendExecute(buf []byte, portal string, maxRows uint32) []byte {
buf = append(buf, 'E')
sp := len(buf)
buf = pgio.AppendInt32(buf, -1)
buf = append(buf, portal...)
buf = append(buf, 0)
buf = pgio.AppendUint32(buf, maxRows)
pgio.SetInt32(buf[sp:], int32(len(buf[sp:])))
return buf
}
// appendQuery appends a PostgreSQL wire protocol query message to buf and returns it.
func appendQuery(buf []byte, query string) []byte {
buf = append(buf, 'Q')
sp := len(buf)
buf = pgio.AppendInt32(buf, -1)
buf = append(buf, query...)
buf = append(buf, 0)
pgio.SetInt32(buf[sp:], int32(len(buf[sp:])))
return buf
}