/
real_relay.go
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/
real_relay.go
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// Copyright (c) 2015 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 benchmark
import (
"errors"
"os"
"github.com/uber/tchannel-go"
"github.com/uber/tchannel-go/relay"
"github.com/uber/tchannel-go/relay/relaytest"
"go.uber.org/atomic"
)
type fixedHosts struct {
hosts map[string][]string
appends []relay.KeyVal
pickI atomic.Int32
}
func (fh *fixedHosts) Get(cf relay.CallFrame, _ *relay.Conn) (string, error) {
peers := fh.hosts[string(cf.Service())]
if len(peers) == 0 {
return "", errors.New("no peers")
}
for _, kv := range fh.appends {
cf.Arg2Append(kv.Key, kv.Val)
}
pickI := int(fh.pickI.Inc()-1) % len(peers)
return peers[pickI], nil
}
type realRelay struct {
ch *tchannel.Channel
hosts *fixedHosts
}
// NewRealRelay creates a TChannel relay.
func NewRealRelay(services map[string][]string, appends []relay.KeyVal) (Relay, error) {
hosts := &fixedHosts{
hosts: services,
appends: appends,
}
ch, err := tchannel.NewChannel("relay", &tchannel.ChannelOptions{
RelayHost: relaytest.HostFunc(hosts.Get),
Logger: tchannel.NewLevelLogger(tchannel.NewLogger(os.Stderr), tchannel.LogLevelWarn),
})
if err != nil {
return nil, err
}
if err := ch.ListenAndServe("127.0.0.1:0"); err != nil {
return nil, err
}
return &realRelay{
ch: ch,
hosts: hosts,
}, nil
}
func (r *realRelay) HostPort() string {
return r.ch.PeerInfo().HostPort
}
func (r *realRelay) Close() {
r.ch.Close()
}