github.com/matrixorigin/matrixone@v1.2.0/pkg/util/cn_address_func.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  	"context"
    19  	"math/rand"
    20  	"time"
    21  
    22  	"github.com/matrixorigin/matrixone/pkg/clusterservice"
    23  	"github.com/matrixorigin/matrixone/pkg/common/moerr"
    24  	"github.com/matrixorigin/matrixone/pkg/common/runtime"
    25  	pb "github.com/matrixorigin/matrixone/pkg/pb/logservice"
    26  	"github.com/matrixorigin/matrixone/pkg/pb/metadata"
    27  )
    28  
    29  // HAKeeperClient is an interface which is mainly used to avoid cycle import.
    30  type HAKeeperClient interface {
    31  	// GetClusterDetails queries the HAKeeper and return CN and TN nodes that are
    32  	// known to the HAKeeper.
    33  	GetClusterDetails(ctx context.Context) (pb.ClusterDetails, error)
    34  }
    35  
    36  func AddressFunc(getClient func() HAKeeperClient) func(context.Context, bool) (string, error) {
    37  	return func(ctx context.Context, random bool) (string, error) {
    38  		if getClient == nil || getClient() == nil {
    39  			return "", moerr.NewNoHAKeeper(ctx)
    40  		}
    41  		ctx, cancel := context.WithTimeout(ctx, time.Second*5)
    42  		defer cancel()
    43  		selector := clusterservice.NewSelector().SelectByLabel(nil, clusterservice.EQ)
    44  		if s, exist := runtime.ProcessLevelRuntime().GetGlobalVariables(runtime.BackgroundCNSelector); exist {
    45  			selector = s.(clusterservice.Selector)
    46  		}
    47  		details, err := getClient().GetClusterDetails(ctx)
    48  		if err != nil {
    49  			return "", err
    50  		}
    51  		cns := make([]pb.CNStore, 0, len(details.CNStores))
    52  		labeled_cns := make([]pb.CNStore, 0, len(details.CNStores))
    53  		for _, cn := range details.CNStores {
    54  			if cn.WorkState == metadata.WorkState_Working {
    55  				cns = append(cns, cn)
    56  				// get logging cn label name
    57  				if cn.Labels != nil && selector.Match(cn.Labels) {
    58  					labeled_cns = append(labeled_cns, cn)
    59  				}
    60  			}
    61  		}
    62  		if len(cns) == 0 {
    63  			return "", moerr.NewInvalidState(ctx, "no CN in the cluster")
    64  		}
    65  		var selectedCNs []pb.CNStore // Replace CNType with the actual type of your CNs
    66  		if len(labeled_cns) > 0 {
    67  			selectedCNs = labeled_cns
    68  		} else {
    69  			selectedCNs = cns
    70  		}
    71  
    72  		var n int
    73  		if random {
    74  			n = rand.Intn(len(selectedCNs))
    75  		} else {
    76  			n = len(selectedCNs) - 1
    77  		}
    78  
    79  		return selectedCNs[n].SQLAddress, nil
    80  
    81  	}
    82  }