github.com/m3db/m3@v1.5.0/src/dbnode/x/m3em/node/node.go (about)

     1  // Copyright (c) 2017 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package m3db
    22  
    23  import (
    24  	"fmt"
    25  	"sync"
    26  
    27  	m3dbrpc "github.com/m3db/m3/src/dbnode/generated/thrift/rpc"
    28  	m3dbchannel "github.com/m3db/m3/src/dbnode/network/server/tchannelthrift/node/channel"
    29  	"github.com/m3db/m3/src/m3em/node"
    30  
    31  	tchannel "github.com/uber/tchannel-go"
    32  	"github.com/uber/tchannel-go/thrift"
    33  )
    34  
    35  type m3emNode struct {
    36  	sync.Mutex
    37  	node.ServiceNode
    38  
    39  	opts      Options
    40  	rpcClient m3dbrpc.TChanNode
    41  }
    42  
    43  // New constructs a new m3emNode
    44  func New(svcNode node.ServiceNode, opts Options) (Node, error) {
    45  	if err := opts.Validate(); err != nil {
    46  		return nil, err
    47  	}
    48  	return &m3emNode{
    49  		ServiceNode: svcNode,
    50  		opts:        opts,
    51  	}, nil
    52  }
    53  
    54  func (n *m3emNode) client() (m3dbrpc.TChanNode, error) {
    55  	n.Lock()
    56  	defer n.Unlock()
    57  	if n.rpcClient != nil {
    58  		return n.rpcClient, nil
    59  	}
    60  	channel, err := tchannel.NewChannel("Client", nil)
    61  	if err != nil {
    62  		return nil, fmt.Errorf("could not create new tchannel channel: %v", err)
    63  	}
    64  	endpoint := &thrift.ClientOptions{HostPort: n.Endpoint()}
    65  	thriftClient := thrift.NewClient(channel, m3dbchannel.ChannelName, endpoint)
    66  	client := m3dbrpc.NewTChanNodeClient(thriftClient)
    67  	n.rpcClient = client
    68  	return n.rpcClient, nil
    69  }
    70  
    71  func (n *m3emNode) Health() (NodeHealth, error) {
    72  	healthResult := NodeHealth{}
    73  
    74  	client, err := n.client()
    75  	if err != nil {
    76  		return healthResult, err
    77  	}
    78  
    79  	attemptFn := func() error {
    80  		tctx, _ := thrift.NewContext(n.opts.NodeOptions().OperationTimeout())
    81  		result, err := client.Health(tctx)
    82  		if err != nil {
    83  			return err
    84  		}
    85  		healthResult.Bootstrapped = result.GetBootstrapped()
    86  		healthResult.OK = result.GetOk()
    87  		healthResult.Status = result.GetStatus()
    88  		return nil
    89  	}
    90  
    91  	retrier := n.opts.NodeOptions().Retrier()
    92  	err = retrier.Attempt(attemptFn)
    93  	return healthResult, err
    94  }
    95  
    96  func (n *m3emNode) Bootstrapped() bool {
    97  	health, err := n.Health()
    98  	if err != nil {
    99  		return false
   100  	}
   101  	return health.Bootstrapped
   102  }