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/*
Copyright 2014 SAP SE
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package protocol
import (
"fmt"
"github.com/SAP/go-hdb/internal/protocol/encoding"
)
const (
segmentHeaderSize = 24
)
type commandOptions int8
const (
coNil commandOptions = 0x00 //nolint:deadcode
coSelfetchOff commandOptions = 0x01
coScrollableCursorOn commandOptions = 0x02
coNoResultsetCloseNeeded commandOptions = 0x04
coHoldCursorOverCommtit commandOptions = 0x08
coExecuteLocally commandOptions = 0x10
)
var commandOptionsText = map[commandOptions]string{
coSelfetchOff: "selfetchOff",
coScrollableCursorOn: "scrollabeCursorOn",
coNoResultsetCloseNeeded: "noResltsetCloseNeeded",
coHoldCursorOverCommtit: "holdCursorOverCommit",
coExecuteLocally: "executLocally",
}
func (k commandOptions) String() string {
t := make([]string, 0, len(commandOptionsText))
for option, text := range commandOptionsText {
if (k & option) != 0 {
t = append(t, text)
}
}
return fmt.Sprintf("%v", t)
}
//segment header
type segmentHeader struct {
segmentLength int32
segmentOfs int32
noOfParts int16
segmentNo int16
segmentKind segmentKind
messageType messageType
commit bool
commandOptions commandOptions
functionCode functionCode
}
func (h *segmentHeader) String() string {
switch h.segmentKind {
default: //error
return fmt.Sprintf(
"segmentLength %d segmentOfs %d noOfParts %d, segmentNo %d segmentKind %s",
h.segmentLength,
h.segmentOfs,
h.noOfParts,
h.segmentNo,
h.segmentKind,
)
case skRequest:
return fmt.Sprintf(
"segmentLength %d segmentOfs %d noOfParts %d, segmentNo %d segmentKind %s messageType %s commit %t commandOptions %s",
h.segmentLength,
h.segmentOfs,
h.noOfParts,
h.segmentNo,
h.segmentKind,
h.messageType,
h.commit,
h.commandOptions,
)
case skReply:
return fmt.Sprintf(
"segmentLength %d segmentOfs %d noOfParts %d, segmentNo %d segmentKind %s functionCode %s",
h.segmentLength,
h.segmentOfs,
h.noOfParts,
h.segmentNo,
h.segmentKind,
h.functionCode,
)
}
}
// request
func (h *segmentHeader) encode(enc *encoding.Encoder) error {
enc.Int32(h.segmentLength)
enc.Int32(h.segmentOfs)
enc.Int16(h.noOfParts)
enc.Int16(h.segmentNo)
enc.Int8(int8(h.segmentKind))
switch h.segmentKind {
default: //error
enc.Zeroes(11) //segmentHeaderLength
case skRequest:
enc.Int8(int8(h.messageType))
enc.Bool(h.commit)
enc.Int8(int8(h.commandOptions))
enc.Zeroes(8) //segmentHeaderSize
case skReply:
enc.Zeroes(1) //reserved
enc.Int16(int16(h.functionCode))
enc.Zeroes(8) //segmentHeaderSize
}
return nil
}
// reply || error
func (h *segmentHeader) decode(dec *encoding.Decoder) error {
h.segmentLength = dec.Int32()
h.segmentOfs = dec.Int32()
h.noOfParts = dec.Int16()
h.segmentNo = dec.Int16()
h.segmentKind = segmentKind(dec.Int8())
switch h.segmentKind {
default: //error
dec.Skip(11) //segmentHeaderLength
case skRequest:
h.messageType = messageType(dec.Int8())
h.commit = dec.Bool()
h.commandOptions = commandOptions(dec.Int8())
dec.Skip(8) //segmentHeaderLength
case skReply:
dec.Skip(1) //reserved
h.functionCode = functionCode(dec.Int16())
dec.Skip(8) //segmentHeaderLength
}
return dec.Error()
}
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