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node.go
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node.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package m3db
import (
"fmt"
"sync"
m3dbrpc "github.com/m3db/m3/src/dbnode/generated/thrift/rpc"
m3dbchannel "github.com/m3db/m3/src/dbnode/network/server/tchannelthrift/node/channel"
"github.com/m3db/m3/src/m3em/node"
tchannel "github.com/uber/tchannel-go"
"github.com/uber/tchannel-go/thrift"
)
type m3emNode struct {
sync.Mutex
node.ServiceNode
opts Options
rpcClient m3dbrpc.TChanNode
}
// New constructs a new m3emNode
func New(svcNode node.ServiceNode, opts Options) (Node, error) {
if err := opts.Validate(); err != nil {
return nil, err
}
return &m3emNode{
ServiceNode: svcNode,
opts: opts,
}, nil
}
func (n *m3emNode) client() (m3dbrpc.TChanNode, error) {
n.Lock()
defer n.Unlock()
if n.rpcClient != nil {
return n.rpcClient, nil
}
channel, err := tchannel.NewChannel("Client", nil)
if err != nil {
return nil, fmt.Errorf("could not create new tchannel channel: %v", err)
}
endpoint := &thrift.ClientOptions{HostPort: n.Endpoint()}
thriftClient := thrift.NewClient(channel, m3dbchannel.ChannelName, endpoint)
client := m3dbrpc.NewTChanNodeClient(thriftClient)
n.rpcClient = client
return n.rpcClient, nil
}
func (n *m3emNode) Health() (NodeHealth, error) {
healthResult := NodeHealth{}
client, err := n.client()
if err != nil {
return healthResult, err
}
attemptFn := func() error {
tctx, _ := thrift.NewContext(n.opts.NodeOptions().OperationTimeout())
result, err := client.Health(tctx)
if err != nil {
return err
}
healthResult.Bootstrapped = result.GetBootstrapped()
healthResult.OK = result.GetOk()
healthResult.Status = result.GetStatus()
return nil
}
retrier := n.opts.NodeOptions().Retrier()
err = retrier.Attempt(attemptFn)
return healthResult, err
}
func (n *m3emNode) Bootstrapped() bool {
health, err := n.Health()
if err != nil {
return false
}
return health.Bootstrapped
}