github.com/erda-project/erda-infra@v1.0.9/providers/cassandra/session.go (about)

     1  // Copyright (c) 2021 Terminus, Inc.
     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 cassandra
    16  
    17  import (
    18  	"sync"
    19  	"time"
    20  
    21  	"github.com/erda-project/erda-infra/base/logs"
    22  	"github.com/gocql/gocql"
    23  )
    24  
    25  // ReconnectionConfig .
    26  type ReconnectionConfig struct {
    27  	Enable        bool          `file:"enable" default:"true"`
    28  	CheckInterval time.Duration `file:"check_interval" default:"10m"`
    29  	CheckTimeout  time.Duration `file:"check_timeout" default:"60s"`
    30  }
    31  
    32  // Session manager of gocql.Session.
    33  type Session struct {
    34  	session *gocql.Session
    35  	mu      sync.RWMutex
    36  	log     logs.Logger
    37  	done    chan struct{}
    38  }
    39  
    40  // Session get gocql.Session.
    41  func (s *Session) Session() *gocql.Session {
    42  	s.mu.RLock()
    43  	defer s.mu.RUnlock()
    44  	return s.session
    45  }
    46  
    47  // Close .
    48  func (s *Session) Close() {
    49  	close(s.done)
    50  }
    51  
    52  func (s *Session) updateSession(gs *gocql.Session) {
    53  	s.mu.Lock()
    54  	defer s.mu.Unlock()
    55  	s.session = gs
    56  }
    57  
    58  func (s *Session) checkAndReconnect(p *provider, cfg *SessionConfig) {
    59  	log := s.log.Sub("reconnection")
    60  	log.Infof("start to check connection every %s, timeout %s", cfg.Reconnection.CheckInterval, cfg.Reconnection.CheckTimeout)
    61  	ticker := time.NewTicker(cfg.Reconnection.CheckInterval)
    62  	defer ticker.Stop()
    63  
    64  	for {
    65  		if s.Session().Closed() {
    66  			break
    67  		}
    68  		select {
    69  		case <-s.done:
    70  			s.log.Infof("done signal trigger")
    71  			return
    72  		case <-ticker.C:
    73  			err := s.Session().Query("SELECT cql_version FROM system.local").Exec()
    74  			if err != nil {
    75  				newSession, err := p.newSession(cfg.Keyspace.Name, cfg.Consistency)
    76  				if err != nil {
    77  					log.Errorf("new session failed: %s", err)
    78  					continue
    79  				}
    80  				s.updateSession(newSession)
    81  			}
    82  		}
    83  	}
    84  }