github.com/matrixorigin/matrixone@v1.2.0/pkg/util/uuidutil.go (about)

     1  // Copyright 2022 Matrix Origin
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  // http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package util
    16  
    17  import (
    18  	"bytes"
    19  	"context"
    20  	"encoding/binary"
    21  	"hash/fnv"
    22  	"net"
    23  
    24  	"github.com/google/uuid"
    25  	"github.com/matrixorigin/matrixone/pkg/common/moerr"
    26  )
    27  
    28  // getDefaultHardwareAddr returns hardware address(like mac addr), like the first valid val.
    29  var getDefaultHardwareAddr = func(ctx context.Context) (net.HardwareAddr, error) {
    30  	ifaces, err := net.Interfaces()
    31  	if err != nil {
    32  		return []byte{}, err
    33  	}
    34  	for _, iface := range ifaces {
    35  		if len(iface.HardwareAddr) >= 6 {
    36  			return iface.HardwareAddr, nil
    37  		}
    38  	}
    39  	return []byte{}, moerr.NewInternalError(ctx, "uuid: no Hardware address found")
    40  }
    41  
    42  // docker mac addr range: [02:42:ac:11:00:00, 02:42:ac:11:ff:ff]
    43  var dockerMacPrefix = []byte{0x02, 0x42, 0xac}
    44  
    45  // SetUUIDNodeID set all uuid generator's node_id
    46  func SetUUIDNodeID(ctx context.Context, nodeUuid []byte) error {
    47  	var err error
    48  	var hwAddr []byte
    49  	// situation 1: set by mac addr
    50  	hwAddr, err = getDefaultHardwareAddr(ctx)
    51  	if err == nil && !bytes.Equal(hwAddr[:len(dockerMacPrefix)], dockerMacPrefix) && uuid.SetNodeID(hwAddr) {
    52  		return nil
    53  	}
    54  	// case 2: set by nodeUuid prefix
    55  	if len(nodeUuid) > 6 && uuid.SetNodeID(nodeUuid) {
    56  		return nil
    57  	}
    58  	// case 3: set by md5sum{hwAddr + nodeUuid, randomUint64}
    59  	var num [8]byte
    60  	binary.BigEndian.PutUint64(num[:], Fastrand64())
    61  	hasher := fnv.New128()
    62  	if _, err = hasher.Write(hwAddr); err != nil {
    63  		return err
    64  	} else if _, err := hasher.Write(nodeUuid); err != nil {
    65  		return err
    66  	} else if _, err := hasher.Write(num[:]); err != nil {
    67  		return err
    68  	}
    69  	var hash = make([]byte, 0, 16)
    70  	hash = hasher.Sum(hash[:])
    71  	if !uuid.SetNodeID(hash[:]) {
    72  		return moerr.NewInternalError(ctx, "uuid: nodeID too short")
    73  	}
    74  	return nil
    75  }