func readStatusCodeAndSessionId(dbc *DBClient) error {
status, err := rw.ReadByte(dbc.conx)
if err != nil {
return oerror.NewTrace(err)
}
sessionId, err := rw.ReadInt(dbc.conx)
if err != nil {
return oerror.NewTrace(err)
}
if sessionId != dbc.sessionId {
// FIXME: use of fmt.Errorf is an anti-pattern
return fmt.Errorf("sessionId from server (%v) does not match client sessionId (%v)",
sessionId, dbc.sessionId)
}
if status == RESPONSE_STATUS_ERROR {
serverException, err := rw.ReadErrorResponse(dbc.conx)
if err != nil {
return oerror.NewTrace(err)
}
return serverException
}
return nil
}
//
// NewDBClient creates a new DBClient after contacting the OrientDB server
// specified in the ClientOptions and validating that the server and client
// speak the same binary protocol version.
// The DBClient returned is ready to make calls to the OrientDB but has not
// yet established a database session or a session with the OrientDB server.
// After this, the user needs to call either OpenDatabase or CreateServerSession.
//
func NewDBClient(opts ClientOptions) (*DBClient, error) {
// binary port range is: 2424-2430
if opts.ServerHost == "" {
opts.ServerHost = "127.0.0.1"
}
if opts.ServerPort == "" {
opts.ServerPort = "2424"
}
hostport := fmt.Sprintf("%s:%s", opts.ServerHost, opts.ServerPort)
conx, err := net.Dial("tcp", hostport)
if err != nil {
fmt.Fprintf(os.Stderr, "WARN: %v\n", err)
return nil, oerror.NewTrace(err)
}
// after connecting the OrientDB server sends back 2 bytes - its binary protocol version
readbuf := make([]byte, 2)
n, err := conx.Read(readbuf)
if err != nil {
return nil, oerror.NewTrace(err)
}
buf := new(bytes.Buffer)
_, err = buf.Write(readbuf[0:n])
if err != nil {
return nil, oerror.NewTrace(err)
}
var (
svrProtocolNum int16
serdeV0 ORecordSerializer
serializerType string
)
binary.Read(buf, binary.BigEndian, &svrProtocolNum)
if svrProtocolNum < MinSupportedBinaryProtocolVersion {
return nil, ErrUnsupportedVersion{serverVersion: svrProtocolNum}
} else if svrProtocolNum > MaxSupportedBinaryProtocolVersion {
return nil, ErrUnsupportedVersion{serverVersion: svrProtocolNum}
}
serializerType = BinarySerialization
serdeV0 = &ORecordSerializerV0{}
if svrProtocolNum < MinBinarySerializerVersion {
serializerType = CsvSerialization
panic(fmt.Sprintf("Server Binary Protocol Version (%v) is less than the Min Binary Serializer Version supported by this driver (%v)",
svrProtocolNum, MinBinarySerializerVersion))
}
dbc := &DBClient{
conx: conx,
buf: new(bytes.Buffer),
serializationType: serializerType,
binaryProtocolVersion: svrProtocolNum,
serializationVersion: byte(0), // default is 0 // TODO: need to detect if server is using a higher version
sessionId: NoSessionID,
RecordSerDes: []ORecordSerializer{serdeV0},
}
return dbc, nil
}
//
// Returns map of string keys to *oschema.OLink
//
func (serde ORecordSerializerV0) readLinkMap(buf io.Reader) (map[string]*oschema.OLink, error) {
nentries, err := varint.ReadVarIntAndDecode32(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
linkMap := make(map[string]*oschema.OLink)
for i := 0; i < int(nentries); i++ {
/* ---[ read map key ]--- */
datatype, err := rw.ReadByte(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
if datatype != byte(oschema.STRING) {
// FIXME: even though all keys are currently strings, it would be easy to allow other types
// using serde.readDataValue(dbc, buf, serde)
return nil, fmt.Errorf("readLinkMap: datatype for key is NOT string but type: %v", datatype)
}
mapkey, err := varint.ReadString(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
/* ---[ read map value (always a RID) ]--- */
mapval, err := serde.readLink(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
linkMap[mapkey] = mapval
}
return linkMap, nil
}
//
// Serialize takes an ODocument and serializes it to bytes in accordance
// with the OrientDB binary serialization spec and writes them to the
// bytes.Buffer passed in.
//
func (serde ORecordSerializerV0) Serialize(dbc *DBClient, doc *oschema.ODocument) ([]byte, error) {
// temporarily set state for the duration of this Serialize call
// dbc is allowed to be nil for reentrant (recursive) calls -- in which
// case serde.dbc should already be set (not-nil)
if dbc != nil {
if serde.dbc != nil {
return nil, errors.New("Attempted to set dbc again in Serialize when it is already set")
}
serde.dbc = dbc
defer func() {
serde.dbc = nil
}()
} else if serde.dbc == nil {
return nil, errors.New("dbc *DBClient passed into Serialize was null and dbc had not already been set in Serializer state")
}
// need to create a new buffer for the serialized record for ptr value calculations,
// since the incoming buffer (`buf`) already has a lot of stuff written to it (session-id, etc)
// that are NOT part of the serialized record
serdebuf := obuf.NewWriteBuffer(80) // holds only the serialized value
// write the serialization version in so that the buffer size math works
err := rw.WriteByte(serdebuf, 0)
if err != nil {
return nil, oerror.NewTrace(err)
}
err = serde.serializeDocument(serdebuf, doc)
if err != nil {
return nil, oerror.NewTrace(err)
}
return serdebuf.Bytes(), nil
}
func getLongFromDB(dbc *DBClient, cmd byte) (int64, error) {
dbc.buf.Reset()
err := writeCommandAndSessionId(dbc, cmd)
if err != nil {
return int64(-1), oerror.NewTrace(err)
}
// send to the OrientDB server
_, err = dbc.conx.Write(dbc.buf.Bytes())
if err != nil {
return int64(-1), oerror.NewTrace(err)
}
/* ---[ Read Response ]--- */
err = readStatusCodeAndSessionId(dbc)
if err != nil {
return int64(-1), oerror.NewTrace(err)
}
// the answer to the query
longFromDB, err := rw.ReadLong(dbc.conx)
if err != nil {
return int64(-1), oerror.NewTrace(err)
}
return longFromDB, nil
}
//
// The link map allow to have as key the types:
// STRING,SHORT,INTEGER,LONG,BYTE,DATE,DECIMAL,DATETIME,DATA,FLOAT,DOUBLE
// the serialization of the linkmap is a list of entry
//
// +----------------------------+
// | values:link_map_entry[] |
// +----------------------------+
//
// link_map_entry structure
//
// +--------------+------------------+------------+
// | keyType:byte | keyValue:byte[] | link:LINK |
// +--------------+------------------+------------+
//
// keyType - is the type of the key, can be only one of the listed type.
// keyValue - the value of the key serialized with the serializer of the type
// link - the link value stored with the formant of a LINK
//
// TODO: right now only supporting string keys, but need to support the
// datatypes listed above (also for EmbeddedMaps)
//
func (serde ORecordSerializerV0) writeLinkMap(buf *obuf.WriteBuf, m map[string]*oschema.OLink) error {
// number of entries in the map
err := varint.EncodeAndWriteVarInt32(buf, int32(len(m)))
if err != nil {
return oerror.NewTrace(err)
}
for k, v := range m {
// keyType
err = rw.WriteByte(buf, byte(oschema.STRING))
if err != nil {
return oerror.NewTrace(err)
}
// keyValue
err = varint.WriteString(buf, k)
if err != nil {
return oerror.NewTrace(err)
}
// link
err = serde.writeLink(buf, v)
if err != nil {
return oerror.NewTrace(err)
}
}
return nil
}
func readClassname(buf io.Reader) (string, error) {
var (
cnameLen int32
cnameBytes []byte
err error
)
cnameLen, err = varint.ReadVarIntAndDecode32(buf)
if err != nil {
return "", oerror.NewTrace(err)
}
if cnameLen < 0 {
return "", oerror.NewTrace(
fmt.Errorf("Varint for classname len in binary serialization was negative: %d", cnameLen))
}
cnameBytes = make([]byte, int(cnameLen))
n, err := buf.Read(cnameBytes)
if err != nil {
return "", oerror.NewTrace(err)
}
if n != int(cnameLen) {
return "",
fmt.Errorf("Could not read expected number of bytes for className. Expected %d; Read: %d",
cnameLen, len(cnameBytes))
}
return string(cnameBytes), nil
}
//
// readSingleDocument is called by readSingleRecord when it has determined that the server
// has sent a docuemnt ('d'), not flat data ('f') or raw bytes ('b').
// It should be called *after* the single byte below on the first line has been already
// read and determined to be 'd'. The rest the stream (NOT including the EOT byte) will
// be read. The serialized document will be turned into an oschema.ODocument.
//
// Writing byte (1 byte): 100 [OChannelBinaryServer] <- 'd'=document ('f'=flat data, 'b'=raw bytes)
// Writing short (2 bytes): 11 [OChannelBinaryServer] <- cluster-id (RID part 1)
// Writing long (8 bytes): 0 [OChannelBinaryServer] <- cluster-pos (RID part 2)
// Writing int (4 bytes): 1 [OChannelBinaryServer] <- version
// Writing bytes (4+26=30 bytes): [0, 14, 80, 97, 116, ... , 110, 107, 1] <- serialized record
//
func readSingleDocument(dbc *DBClient) (*oschema.ODocument, error) {
clusterId, err := rw.ReadShort(dbc.conx)
if err != nil {
return nil, oerror.NewTrace(err)
}
clusterPos, err := rw.ReadLong(dbc.conx)
if err != nil {
return nil, oerror.NewTrace(err)
}
recVersion, err := rw.ReadInt(dbc.conx)
if err != nil {
return nil, oerror.NewTrace(err)
}
recBytes, err := rw.ReadBytes(dbc.conx)
if err != nil {
return nil, oerror.NewTrace(err)
}
rid := oschema.ORID{ClusterID: clusterId, ClusterPos: clusterPos}
doc, err := createDocumentFromBytes(rid, recVersion, recBytes, dbc)
ogl.Debugf("::single record doc:::::: %v\n", doc)
return doc, err
}
//
// Example data section for tree-based LinkBag
//
// ( --------------------- collectionPointer ----------------------- ) (---size:int--) (-changes-)
// (----- fileId:long ----) ( ---pageIndex:long--- ) (pageOffset:int)
// TREEBASED 30 0 2048 -1 0
// 0, 0, 0, 0, 0, 0, 0, 0, 30, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, -1, -1, -1, -1, 0, 0, 0, 0,
//
func readTreeBasedLinkBag(buf io.Reader) (*oschema.OLinkBag, error) {
fileID, err := rw.ReadLong(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
pageIdx, err := rw.ReadLong(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
pageOffset, err := rw.ReadInt(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
// TODO: need to know how to handle the size and changes stuff => advanced feature not needed yet
size, err := rw.ReadInt(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
_, err = rw.ReadInt(buf) // changes // TODO: is changes always an int32?
if err != nil {
return nil, oerror.NewTrace(err)
}
return oschema.NewTreeOLinkBag(fileID, pageIdx, pageOffset, size), nil
}
func readEmbeddedLinkBag(rdr io.Reader) (*oschema.OLinkBag, error) {
bs := make([]byte, 1)
n, err := rdr.Read(bs)
if err != nil {
return nil, oerror.NewTrace(err)
}
if n != 1 {
return nil, oerror.IncorrectNetworkRead{Expected: 1, Actual: n}
}
if bs[0] == 1 {
uuid, err := readLinkBagUUID(rdr)
if err != nil {
return nil, oerror.NewTrace(err)
}
ogl.Debugf("read uuid %v - now what?\n", uuid)
} else {
// if b wasn't zero, then there's no UUID and b was the first byte of an int32
// specifying the size of the embedded bag collection
// TODO: I'm not sure this is the right thing - the OrientDB is pretty hazy on how this works
switch rdr.(type) {
case *bytes.Buffer:
buf := rdr.(*bytes.Buffer)
buf.UnreadByte()
case *obuf.ReadBuf:
buf := rdr.(*obuf.ReadBuf)
buf.UnreadByte()
default:
panic("Unknown type of buffer in binserde#readEmbeddedLinkBag")
}
}
bagsz, err := rw.ReadInt(rdr)
if err != nil {
return nil, oerror.NewTrace(err)
}
links := make([]*oschema.OLink, bagsz)
for i := int32(0); i < bagsz; i++ {
clusterID, err := rw.ReadShort(rdr)
if err != nil {
return nil, oerror.NewTrace(err)
}
clusterPos, err := rw.ReadLong(rdr)
if err != nil {
return nil, oerror.NewTrace(err)
}
orid := oschema.ORID{ClusterID: clusterID, ClusterPos: clusterPos}
links[i] = &oschema.OLink{RID: orid}
}
return oschema.NewOLinkBag(links), nil
}
//
// readSingleRecord should be called to read a single record from the DBClient connection
// stream (from a db query/command). In particular, this function should be called
// after the resultType has been read from the stream and resultType == 'r' (byte 114).
// When this is called the 'r' byte shown below should have already been read. This
// function will then read everything else shown here - including the serialized record,
// but *NOT* including the byte after the serialized record (which is 0 to indicate
// End of Transmission).
//
// Writing byte (1 byte): 114 [OChannelBinaryServer] <- 'r' (type=single-record)
// Writing short (2 bytes): 0 [OChannelBinaryServer] <- 0=full record (-2=null, -3=RID only)
// Writing byte (1 byte): 100 [OChannelBinaryServer] <- 'd'=document ('f'=flat data, 'b'=raw bytes)
// Writing short (2 bytes): 11 [OChannelBinaryServer] <- cluster-id (RID part 1)
// Writing long (8 bytes): 0 [OChannelBinaryServer] <- cluster-pos (RID part 2)
// Writing int (4 bytes): 1 [OChannelBinaryServer] <- version
// Writing bytes (4+26=30 bytes): [0, 14, 80, 97, 116, ... , 110, 107, 1] <- serialized record
//
// A new single ODocument pointer is returned.
//
// TODO: this method needs to determine how to handle 'f' (flat data) and 'b' (raw bytes)
//
func readSingleRecord(dbc *DBClient) (*oschema.ODocument, error) {
var doc *oschema.ODocument
resultType, err := rw.ReadShort(dbc.conx)
if err != nil {
return nil, oerror.NewTrace(err)
}
if resultType == RecordNull { // null record
// do nothing - return the zero values of the return types
return nil, nil
} else if resultType == RecordRID {
orid, err := readRID(dbc)
if err != nil {
return nil, oerror.NewTrace(err)
}
doc = oschema.NewDocument("")
doc.RID = orid
ogl.Warn(fmt.Sprintf("readSingleRecord :: Code path not seen before!!: SQLCommand resulted in RID: %s\n", orid))
// TODO: would now load that record from the DB if the user (Go SQL API) wants it
return doc, nil
} else if resultType != int16(0) {
_, file, line, _ := runtime.Caller(0)
return nil, fmt.Errorf("Unexpected resultType in SQLCommand (file: %s; line %d): %d",
file, line+1, resultType)
}
// if get here then have a full record, which can be in one of three formats:
// - "flat data"
// - "raw bytes"
// - "document"
recType, err := rw.ReadByte(dbc.conx)
if err != nil {
return nil, oerror.NewTrace(err)
}
if recType == byte('d') {
return readSingleDocument(dbc)
} else if recType == byte('f') {
return readFlatDataRecord(dbc) // ???
} else if recType == byte('b') {
return readRawBytesRecord(dbc) // ???
} else {
_, file, line, _ := runtime.Caller(0)
return nil, fmt.Errorf("Unexpected record type. Expected 'd', 'f' or 'b', but was %v (file: %s; line %d)",
recType, file, line+1)
}
}
//
// +-----------------+-----------------+
// |clusterId:varint | recordId:varInt |
// +-----------------+-----------------+
//
func (serde ORecordSerializerV0) writeLink(buf *obuf.WriteBuf, lnk *oschema.OLink) error {
err := varint.EncodeAndWriteVarInt32(buf, int32(lnk.RID.ClusterID))
if err != nil {
return oerror.NewTrace(err)
}
err = varint.EncodeAndWriteVarInt64(buf, lnk.RID.ClusterPos)
if err != nil {
return oerror.NewTrace(err)
}
return nil
}
//
// readLink reads a two int64's - the cluster and record.
// We translate it here to a string RID (cluster:record) and return it.
//
func (serde ORecordSerializerV0) readLink(buf io.Reader) (*oschema.OLink, error) {
clusterID, err := varint.ReadVarIntAndDecode64(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
clusterPos, err := varint.ReadVarIntAndDecode64(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
orid := oschema.ORID{ClusterID: int16(clusterID), ClusterPos: clusterPos}
return &oschema.OLink{RID: orid}, nil
}
func (ols OLinkSerializer) Deserialize(buf *bytes.Buffer) (interface{}, error) {
clusterID, err := rw.ReadShort(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
clusterPos, err := rw.ReadLong(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
rid := oschema.ORID{ClusterID: clusterID, ClusterPos: clusterPos}
return &oschema.OLink{RID: rid}, nil
}
//
// readRID should be called when a single record (as opposed to a collection of
// records) is returned from a db query/command (REQUEST_COMMAND only ???).
// That is when the server sends back:
// 1) Writing byte (1 byte): 0 [OChannelBinaryServer] -> SUCCESS
// 2) Writing int (4 bytes): 192 [OChannelBinaryServer] -> session-id
// 3) Writing byte (1 byte): 114 [OChannelBinaryServer] -> 'r' (single record)
// 4) Writing short (2 bytes): 0 [OChannelBinaryServer] -> full record (not null, not RID only)
// Line 3 can be 'l' or possibly other things. For 'l' call readResultSet.
// Line 4 can be 0=full-record, -2=null, -3=RID only. For -3, call readRID. For 0, call this readSingleDocument.
//
func readRID(dbc *DBClient) (oschema.ORID, error) {
// svr response: (-3:short)(cluster-id:short)(cluster-position:long)
// TODO: impl me -> in the future this may need to call loadRecord for the RID and return the ODocument
clusterID, err := rw.ReadShort(dbc.conx)
if err != nil {
return oschema.NewORID(), oerror.NewTrace(err)
}
clusterPos, err := rw.ReadLong(dbc.conx)
if err != nil {
return oschema.NewORID(), oerror.NewTrace(err)
}
return oschema.ORID{ClusterID: clusterID, ClusterPos: clusterPos}, nil
}
func writeLinkBagCollectionPointer(buf *bytes.Buffer, linkBag *oschema.OLinkBag) error {
// (treePointer:collectionPointer)(changes)
// where collectionPtr = (fileId:long)(pageIndex:long)(pageOffset:int)
err := rw.WriteLong(buf, linkBag.GetFileID())
if err != nil {
return oerror.NewTrace(err)
}
err = rw.WriteLong(buf, linkBag.GetPageIndex())
if err != nil {
return oerror.NewTrace(err)
}
return rw.WriteInt(buf, linkBag.GetPageOffset())
}
//
// varint.ReadBytes, like rw.ReadBytes, first reads a length from the
// input buffer and then that number of bytes into a []byte from the
// input buffer. The difference is that the integer indicating the length
// of the byte array to follow is a zigzag encoded varint.
//
func ReadBytes(buf io.Reader) ([]byte, error) {
// an encoded varint give the length of the remaining byte array
// TODO: might be better to have a ReadVarIntAndDecode that chooses whether to do
// int32 or int64 based on the size of the varint and then returns interface{} ?
lenbytes, err := ReadVarIntAndDecode64(buf)
if err != nil {
return nil, err
}
if lenbytes == 0 {
return nil, nil
}
if lenbytes < 0 {
return nil, fmt.Errorf("Error in varint.ReadBytes: size of bytes was less than zero: %v", lenbytes)
}
size := int(lenbytes)
data := make([]byte, size)
n, err := buf.Read(data)
if err != nil {
return nil, oerror.NewTrace(err)
}
if n != size {
return nil, oerror.IncorrectNetworkRead{Expected: size, Actual: n}
}
return data, nil
}
//
// varint.ReadString, like rw.ReadString, first reads a length from the
// input buffer and then that number of bytes (of ASCII chars) into a string
// from the input buffer. The difference is that the integer indicating the
// length of the byte array to follow is a zigzag encoded varint.
//
func ReadString(buf io.Reader) (string, error) {
bs, err := ReadBytes(buf)
if err != nil {
return "", oerror.NewTrace(err)
}
return string(bs), nil
}
//
// +-------------+-------------------+
// | size:varint | collection:LINK[] |
// +-------------+-------------------+
//
func (serde ORecordSerializerV0) writeLinkList(buf *obuf.WriteBuf, lnks []*oschema.OLink) error {
// number of entries in the list
err := varint.EncodeAndWriteVarInt32(buf, int32(len(lnks)))
if err != nil {
return oerror.NewTrace(err)
}
for _, lnk := range lnks {
err = serde.writeLink(buf, lnk)
if err != nil {
return oerror.NewTrace(err)
}
}
return nil
}
//
// writeDateTime takes an interface{} value that must be of type:
// - time.Time
// - int or int64, representing milliseconds since Epoch
//
// NOTE: format for OrientDB DATETIME:
// Golang formatted date: 2006-01-02 03:04:05
// Example: 2014-11-25 09:14:54
//
// OrientDB server converts a DATETIME type to millisecond unix epoch and
// stores it as the type LONG. It is written as a varint long to the
// obuf.WriteBuf passed in.
//
func writeDateTime(buf *obuf.WriteBuf, value interface{}) error {
var millisEpoch int64
switch value.(type) {
case int:
millisEpoch = int64(value.(int))
case int64:
millisEpoch = value.(int64)
case time.Time:
// UnixNano returns t as a Unix time, the number of nanoseconds elapsed
// since January 1, 1970 UTC.
tm := value.(time.Time)
tt := tm.Round(time.Millisecond)
millisEpoch = tt.UnixNano() / (1000 * 1000)
default:
return oerror.ErrDataTypeMismatch{
ExpectedDataType: oschema.DATETIME,
ExpectedGoType: "time.Time | int64 | int",
ActualValue: value,
}
}
err := varint.EncodeAndWriteVarInt64(buf, millisEpoch)
if err != nil {
return oerror.NewTrace(err)
}
return nil
}
//
// ReadVarIntAndDecode64 reads a varint from r to a uint64
// and then zigzag decodes it to an int64 value.
//
func ReadVarIntAndDecode64(r io.Reader) (int64, error) {
encodedLen, err := ReadVarIntToUint(r)
if err != nil {
return 0, oerror.NewTrace(err)
}
return ZigzagDecodeInt64(encodedLen), nil
}
//
// DropCluster drops a cluster to the current database. It is a
// database-level operation, so OpenDatabase must have already
// been called first in order to start a session with the database.
// If nil is returned, then the action succeeded.
//
func DropCluster(dbc *DBClient, clusterName string) error {
dbc.buf.Reset()
clusterID := findClusterWithName(dbc.currDB.Clusters, strings.ToLower(clusterName))
if clusterID < 0 {
// TODO: This is problematic - someone else may add the cluster not through this
// driver session and then this would fail - so options:
// 1) do a lookup of all clusters on the DB
// 2) provide a DropClusterById(dbc, clusterID)
return fmt.Errorf("No cluster with name %s is known in database %s\n", clusterName, dbc.currDB.Name)
}
err := writeCommandAndSessionId(dbc, REQUEST_DATACLUSTER_DROP)
if err != nil {
return oerror.NewTrace(err)
}
err = rw.WriteShort(dbc.buf, clusterID)
if err != nil {
return oerror.NewTrace(err)
}
// send to the OrientDB server
_, err = dbc.conx.Write(dbc.buf.Bytes())
if err != nil {
return oerror.NewTrace(err)
}
/* ---[ Read Response ]--- */
err = readStatusCodeAndSessionId(dbc)
if err != nil {
return oerror.NewTrace(err)
}
delStatus, err := rw.ReadByte(dbc.conx)
if err != nil {
return oerror.NewTrace(err)
}
if delStatus != byte(1) {
return fmt.Errorf("Drop cluster action failed. Return code from server was not '1', but %d",
delStatus)
}
return nil
}
func (serde ORecordSerializerV0) readLinkList(buf io.Reader) ([]*oschema.OLink, error) {
nrecs, err := varint.ReadVarIntAndDecode32(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
links := make([]*oschema.OLink, int(nrecs))
for i := range links {
lnk, err := serde.readLink(buf)
if err != nil {
return nil, oerror.NewTrace(err)
}
links[i] = lnk
}
return links, nil
}
func writeCommandAndSessionId(dbc *DBClient, cmd byte) error {
if dbc.sessionId == NoSessionID {
return oerror.SessionNotInitialized{}
}
err := rw.WriteByte(dbc.buf, cmd)
if err != nil {
return oerror.NewTrace(err)
}
err = rw.WriteInt(dbc.buf, dbc.sessionId)
if err != nil {
return oerror.NewTrace(err)
}
return nil
}
//
// EncodeAndWriteVarInt64 zigzag encodes the int64 passed in and then
// translates that number to a protobuf/OrientDB varint, writing
// the bytes of that varint to the io.Writer.
//
func EncodeAndWriteVarInt64(wtr io.Writer, n int64) error {
zze := ZigzagEncodeUInt64(n)
err := varintEncode(wtr, zze)
if err != nil {
return oerror.NewTrace(err)
}
return nil
}
//
// readDateTime reads an OrientDB DATETIME from the stream and converts it to
// a golang time.Time struct. DATETIME is precise to the second.
// The time zone of the time.Time returned should be the Local timezone.
//
// OrientDB server converts a DATETIME type to millisecond unix epoch and
// stores it as the type LONG. It is written as a varint long.
//
func (serde ORecordSerializerV0) readDateTime(r io.Reader) (time.Time, error) {
dtAsLong, err := varint.ReadVarIntAndDecode64(r)
if err != nil {
return time.Unix(0, 0), oerror.NewTrace(err)
}
dtSecs := dtAsLong / 1000
dtNanos := (dtAsLong % 1000) * 1000000
return time.Unix(dtSecs, dtNanos), nil
}
//
// FetchClusterDataRange returns the range of record ids for a cluster
//
func FetchClusterDataRange(dbc *DBClient, clusterName string) (begin, end int64, err error) {
dbc.buf.Reset()
clusterID := findClusterWithName(dbc.currDB.Clusters, strings.ToLower(clusterName))
if clusterID < 0 {
// TODO: This is problematic - someone else may add the cluster not through this
// driver session and then this would fail - so options:
// 1) do a lookup of all clusters on the DB
// 2) provide a FetchClusterRangeById(dbc, clusterID)
return begin, end,
fmt.Errorf("No cluster with name %s is known in database %s\n", clusterName, dbc.currDB.Name)
}
err = writeCommandAndSessionId(dbc, REQUEST_DATACLUSTER_DATARANGE)
if err != nil {
return begin, end, oerror.NewTrace(err)
}
err = rw.WriteShort(dbc.buf, clusterID)
if err != nil {
return begin, end, oerror.NewTrace(err)
}
// send to the OrientDB server
_, err = dbc.conx.Write(dbc.buf.Bytes())
if err != nil {
return begin, end, oerror.NewTrace(err)
}
/* ---[ Read Response ]--- */
err = readStatusCodeAndSessionId(dbc)
if err != nil {
return begin, end, oerror.NewTrace(err)
}
begin, err = rw.ReadLong(dbc.conx)
if err != nil {
return begin, end, oerror.NewTrace(err)
}
end, err = rw.ReadLong(dbc.conx)
return begin, end, err
}
//
// serializeDocument writes the classname and the serialized record
// (header and data sections) of the ODocument to the obuf.WriteBuf.
//
// Because this method writes the classname but NOT the serialization
// version, this method is safe for recursive calls for EMBEDDED types.
//
func (serde ORecordSerializerV0) serializeDocument(wbuf *obuf.WriteBuf, doc *oschema.ODocument) error {
err := varint.WriteString(wbuf, doc.Classname)
if err != nil {
return oerror.NewTrace(err)
}
ogl.Debugf("serdebuf A: %v\n", wbuf.Bytes()) // DEBUG
ogl.Debugf("doc A: %v\n", doc) // DEBUG
return serde.writeSerializedRecord(wbuf, doc)
}
//
// ReadString xxxx
// If the string size is 0 an empty string and nil error are returned
//
func ReadString(rdr io.Reader) (string, error) {
bs, err := ReadBytes(rdr)
if err != nil {
return "", oerror.NewTrace(err)
}
if bs == nil {
return "", nil
}
return string(bs), nil
}
func ReadInt(rdr io.Reader) (int32, error) {
intSz := 4
readbuf := make([]byte, intSz)
n, err := rdr.Read(readbuf)
if err != nil {
return DEFAULT_RETVAL, oerror.NewTrace(err)
}
if n != intSz {
return DEFAULT_RETVAL, oerror.IncorrectNetworkRead{Expected: intSz, Actual: n}
}
var intval int32
buf := bytes.NewBuffer(readbuf)
err = binary.Read(buf, binary.BigEndian, &intval)
if err != nil {
return DEFAULT_RETVAL, oerror.NewTrace(err)
}
return intval, nil
}