github.com/matrixorigin/matrixone@v1.2.0/pkg/tnservice/replica.go (about)

     1  // Copyright 2021 - 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 tnservice
    16  
    17  import (
    18  	"context"
    19  	"sync"
    20  
    21  	"github.com/matrixorigin/matrixone/pkg/common/log"
    22  	"github.com/matrixorigin/matrixone/pkg/common/moerr"
    23  	"github.com/matrixorigin/matrixone/pkg/common/runtime"
    24  	"github.com/matrixorigin/matrixone/pkg/pb/metadata"
    25  	"github.com/matrixorigin/matrixone/pkg/pb/txn"
    26  	"github.com/matrixorigin/matrixone/pkg/txn/service"
    27  	"github.com/matrixorigin/matrixone/pkg/txn/util"
    28  )
    29  
    30  // replica tn shard replica.
    31  type replica struct {
    32  	rt       runtime.Runtime
    33  	logger   *log.MOLogger
    34  	shard    metadata.TNShard
    35  	service  service.TxnService
    36  	startedC chan struct{}
    37  
    38  	mu struct {
    39  		sync.RWMutex
    40  		starting bool
    41  	}
    42  }
    43  
    44  func newReplica(shard metadata.TNShard, rt runtime.Runtime) *replica {
    45  	return &replica{
    46  		rt:       rt,
    47  		shard:    shard,
    48  		logger:   rt.Logger().With(util.TxnTNShardField(shard)),
    49  		startedC: make(chan struct{}),
    50  	}
    51  }
    52  
    53  func (r *replica) start(txnService service.TxnService) error {
    54  	r.mu.Lock()
    55  	if r.mu.starting {
    56  		r.mu.Unlock()
    57  		return nil
    58  	}
    59  	r.mu.starting = true
    60  	r.mu.Unlock()
    61  
    62  	defer close(r.startedC)
    63  	r.service = txnService
    64  	return r.service.Start()
    65  }
    66  
    67  func (r *replica) close(destroy bool) error {
    68  	r.mu.RLock()
    69  	defer r.mu.RUnlock()
    70  	if !r.mu.starting {
    71  		return nil
    72  	}
    73  	r.waitStarted()
    74  	return r.service.Close(destroy)
    75  }
    76  
    77  func (r *replica) handleLocalRequest(ctx context.Context, request *txn.TxnRequest, response *txn.TxnResponse) error {
    78  	r.waitStarted()
    79  	prepareResponse(request, response)
    80  
    81  	switch request.Method {
    82  	case txn.TxnMethod_GetStatus:
    83  		return r.service.GetStatus(ctx, request, response)
    84  	case txn.TxnMethod_Prepare:
    85  		return r.service.Prepare(ctx, request, response)
    86  	case txn.TxnMethod_CommitTNShard:
    87  		return r.service.CommitTNShard(ctx, request, response)
    88  	case txn.TxnMethod_RollbackTNShard:
    89  		return r.service.RollbackTNShard(ctx, request, response)
    90  	default:
    91  		return moerr.NewNotSupported(ctx, "unknown txn request method: %s", request.Method.String())
    92  	}
    93  }
    94  
    95  func (r *replica) waitStarted() {
    96  	<-r.startedC
    97  }