示例#1
0
//
// 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
}
示例#2
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//
// 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
}
示例#3
0
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
}
示例#4
0
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
}
示例#5
0
//
// 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
}
示例#6
0
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
}
示例#7
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//
// 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
}
示例#8
0
//
// readResultSet should be called for collections (resultType = 'l')
// from a SQLQuery call.
//
func readResultSet(dbc *DBClient) ([]*oschema.ODocument, error) {
	// for Collection
	// next val is: (collection-size:int)
	// and then each record is serialized according to format:
	// (0:short)(record-type:byte)(cluster-id:short)(cluster-position:long)(record-version:int)(record-content:bytes)

	resultSetSize, err := rw.ReadInt(dbc.conx)
	if err != nil {
		return nil, oerror.NewTrace(err)
	}

	rsize := int(resultSetSize)
	docs := make([]*oschema.ODocument, rsize)

	for i := 0; i < rsize; i++ {
		// TODO: move code below to readRecordInResultSet
		// this apparently should always be zero for serialized records -> not sure it's meaning
		zero, err := rw.ReadShort(dbc.conx)
		if err != nil {
			return nil, oerror.NewTrace(err)
		}
		if zero != int16(0) {
			return nil, fmt.Errorf("ERROR: readResultSet: expected short value of 0 but is %d", zero)
		}

		recType, err := rw.ReadByte(dbc.conx)
		if err != nil {
			return nil, oerror.NewTrace(err)
		}

		// TODO: may need to check recType here => not sure that clusterId, clusterPos and version follow next if
		//       type is 'b' (raw bytes) or 'f' (flat record)
		//       see the readSingleDocument method (and probably call that one instead?)
		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)
		}
		if recType == byte('d') { // Document
			var doc *oschema.ODocument
			rid := oschema.ORID{ClusterID: clusterId, ClusterPos: clusterPos}
			recBytes, err := rw.ReadBytes(dbc.conx)
			if err != nil {
				return nil, oerror.NewTrace(err)
			}
			doc, err = createDocumentFromBytes(rid, recVersion, recBytes, dbc)
			if err != nil {
				return nil, oerror.NewTrace(err)
			}
			docs[i] = doc

		} else {
			_, file, line, _ := runtime.Caller(0)
			return nil, fmt.Errorf("%v: %v: Record type %v is not yet supported", file, line+1, recType)
		}
	} // end for loop

	// end, err := rw.ReadByte(dbc.conx)
	// if err != nil {
	// 	return nil, oerror.NewTrace(err)
	// }
	// if end != byte(0) {
	// 	return nil, fmt.Errorf("Final Byte read from collection result set was not 0, but was: %v", end)
	// }
	return docs, nil
}
示例#9
0
func getClusterCount(dbc *DBClient, countTombstones bool, clusterNames []string) (count int64, err error) {
	dbc.buf.Reset()

	clusterIDs := make([]int16, len(clusterNames))
	for i, name := range clusterNames {
		clusterID := findClusterWithName(dbc.currDB.Clusters, strings.ToLower(name))
		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 FetchClusterCountById(dbc, clusterID)
			return int64(0),
				fmt.Errorf("No cluster with name %s is known in database %s\n",
					name, dbc.currDB.Name)
		}
		clusterIDs[i] = clusterID
	}

	err = writeCommandAndSessionId(dbc, REQUEST_DATACLUSTER_COUNT)
	if err != nil {
		return int64(0), oerror.NewTrace(err)
	}

	// specify number of clusterIDs being sent and then write the clusterIDs
	err = rw.WriteShort(dbc.buf, int16(len(clusterIDs)))
	if err != nil {
		return int64(0), oerror.NewTrace(err)
	}

	for _, cid := range clusterIDs {
		err = rw.WriteShort(dbc.buf, cid)
		if err != nil {
			return int64(0), oerror.NewTrace(err)
		}
	}

	// count-tombstones
	var ct byte
	if countTombstones {
		ct = byte(1)
	}
	err = rw.WriteByte(dbc.buf, ct) // presuming that 0 means "false"
	if err != nil {
		return int64(0), oerror.NewTrace(err)
	}

	// send to the OrientDB server
	_, err = dbc.conx.Write(dbc.buf.Bytes())
	if err != nil {
		return int64(0), oerror.NewTrace(err)
	}

	/* ---[ Read Response ]--- */

	err = readStatusCodeAndSessionId(dbc)
	if err != nil {
		return int64(0), oerror.NewTrace(err)
	}

	nrecs, err := rw.ReadLong(dbc.conx)
	if err != nil {
		return int64(0), oerror.NewTrace(err)
	}

	return nrecs, err
}