/
peer.go
109 lines (92 loc) · 2.97 KB
/
peer.go
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// Copyright (c) 2019 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 grpc
import (
"context"
"go.uber.org/yarpc/api/peer"
"go.uber.org/yarpc/peer/hostport"
"google.golang.org/grpc"
"google.golang.org/grpc/connectivity"
)
type grpcPeer struct {
*hostport.Peer
t *Transport
ctx context.Context
cancel context.CancelFunc
clientConn *grpc.ClientConn
stoppedC chan struct{}
}
func (t *Transport) newPeer(address string, options *dialOptions) (*grpcPeer, error) {
dialOptions := append([]grpc.DialOption{
grpc.WithUserAgent(UserAgent),
grpc.WithDefaultCallOptions(
grpc.CallCustomCodec(customCodec{}),
grpc.MaxCallRecvMsgSize(t.options.clientMaxRecvMsgSize),
grpc.MaxCallSendMsgSize(t.options.clientMaxSendMsgSize),
),
}, options.grpcOptions()...)
clientConn, err := grpc.Dial(address, dialOptions...)
if err != nil {
return nil, err
}
ctx, cancel := context.WithCancel(context.Background())
grpcPeer := &grpcPeer{
Peer: hostport.NewPeer(hostport.PeerIdentifier(address), t),
t: t,
ctx: ctx,
cancel: cancel,
clientConn: clientConn,
stoppedC: make(chan struct{}),
}
go grpcPeer.monitor()
return grpcPeer, nil
}
func (p *grpcPeer) monitor() {
p.Peer.SetStatus(peer.Unavailable)
var grpcStatus connectivity.State
for {
grpcStatus = p.clientConn.GetState()
yarpcStatus := grpcStatusToYARPCStatus(grpcStatus)
p.Peer.SetStatus(yarpcStatus)
if !p.clientConn.WaitForStateChange(p.ctx, grpcStatus) {
break
}
}
p.Peer.SetStatus(peer.Unavailable)
// Close always returns an error.
_ = p.clientConn.Close()
close(p.stoppedC)
}
func (p *grpcPeer) stop() {
p.cancel()
}
func (p *grpcPeer) wait() {
<-p.stoppedC
}
func grpcStatusToYARPCStatus(grpcStatus connectivity.State) peer.ConnectionStatus {
switch grpcStatus {
case connectivity.Ready:
return peer.Available
case connectivity.Connecting:
return peer.Connecting
default:
return peer.Unavailable
}
}