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wire_update.go
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wire_update.go
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package mongowire
import (
"bytes"
"errors"
"github.com/tychoish/birch"
)
func NewUpdate(ns string, flags int32, filter, update *birch.Document) Message {
return &updateMessage{
header: MessageHeader{
RequestID: 19,
OpCode: OP_UPDATE,
},
Namespace: ns,
Flags: flags,
Filter: filter,
Update: update,
}
}
func (m *updateMessage) HasResponse() bool { return false }
func (m *updateMessage) Header() MessageHeader { return m.header }
func (m *updateMessage) Scope() *OpScope {
return &OpScope{Type: m.header.OpCode, Context: m.Namespace}
}
func (m *updateMessage) Serialize() []byte {
size := 16 /* header */ + 8 /* update header */
size += len(m.Namespace) + 1
size += getDocSize(m.Filter)
size += getDocSize(m.Update)
m.header.Size = int32(size)
buf := bytes.NewBuffer(make([]byte, 0, size))
m.header.WriteTo(buf)
writeInt32(0, buf)
writeCString(m.Namespace, buf)
writeInt32(m.Flags, buf)
m.Filter.WriteTo(buf)
m.Update.WriteTo(buf)
return buf.Bytes()
}
func (h *MessageHeader) parseUpdateMessage(buf []byte) (Message, error) {
var (
err error
loc int
)
if len(buf) < 4 {
return nil, errors.New("invalid update message -- message must have length of at least 4 bytes")
}
m := &updateMessage{
header: *h,
}
m.Reserved = readInt32(buf[loc:])
loc += 4
m.Namespace, err = readCString(buf[loc:])
if err != nil {
return nil, err
}
loc += len(m.Namespace) + 1
if len(buf) < (loc + 4) {
return nil, errors.New("invalid update message -- message length is too short")
}
m.Flags = readInt32(buf[loc:])
loc += 4
m.Filter, err = birch.ReadDocument(buf[loc:])
if err != nil {
return nil, err
}
loc += getDocSize(m.Filter)
if len(buf) < loc {
return m, errors.New("invalid update message -- message length is too short")
}
m.Update, err = birch.ReadDocument(buf[loc:])
if err != nil {
return nil, err
}
loc += getDocSize(m.Update) // nolint
return m, nil
}