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wire_query.go
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wire_query.go
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package mongowire
import (
"bytes"
"errors"
"github.com/tychoish/birch"
)
func NewQuery(ns string, flags, skip, toReturn int32, query, project *birch.Document) Message {
return &queryMessage{
header: MessageHeader{
RequestID: 19,
OpCode: OP_QUERY,
},
Flags: flags,
Namespace: ns,
Skip: skip,
NReturn: toReturn,
Query: query,
Project: project,
}
}
func (m *queryMessage) HasResponse() bool { return true }
func (m *queryMessage) Header() MessageHeader { return m.header }
func (m *queryMessage) Scope() *OpScope { return &OpScope{Type: m.header.OpCode, Context: m.Namespace} }
func (m *queryMessage) Serialize() []byte {
size := 16 /* header */ + 12 /* query header */
size += len(m.Namespace) + 1
size += getDocSize(m.Query)
size += getDocSize(m.Project)
m.header.Size = int32(size)
buf := bytes.NewBuffer(make([]byte, 0, size))
m.header.WriteTo(buf)
writeInt32(m.Flags, buf)
writeCString(m.Namespace, buf)
writeInt32(m.Skip, buf)
writeInt32(m.NReturn, buf)
m.Query.WriteTo(buf)
m.Project.WriteTo(buf)
return buf.Bytes()
}
func (m *queryMessage) convertToCommand() *CommandMessage {
if !NamespaceIsCommand(m.Namespace) {
return nil
}
return &CommandMessage{
header: MessageHeader{
OpCode: OP_COMMAND,
RequestID: 19,
},
DB: NamespaceToDB(m.Namespace),
CmdName: m.Query.ElementAt(0).Key(),
CommandArgs: m.Query,
upconverted: true,
}
}
func (h *MessageHeader) parseQueryMessage(buf []byte) (Message, error) {
if len(buf) < 4 {
return nil, errors.New("invalid query message -- message must have length of at least 4 bytes")
}
var (
loc int
err error
)
qm := &queryMessage{
header: *h,
}
qm.Flags = readInt32(buf)
loc += 4
qm.Namespace, err = readCString(buf[loc:])
if err != nil {
return nil, err
}
loc += len(qm.Namespace) + 1
if len(buf) < loc+8 {
return qm, errors.New("invalid query message -- message length is too short")
}
qm.Skip = readInt32(buf[loc:])
loc += 4
qm.NReturn = readInt32(buf[loc:])
loc += 4
qm.Query, err = birch.ReadDocument(buf[loc:])
if err != nil {
return nil, err
}
loc += getDocSize(qm.Query)
if loc < len(buf) {
qm.Project, err = birch.ReadDocument(buf[loc:])
if err != nil {
return nil, err
}
loc += getDocSize(qm.Project) // nolint
}
if NamespaceIsCommand(qm.Namespace) {
return qm.convertToCommand(), nil
}
return qm, nil
}