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server.go
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server.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 main
import (
"errors"
"flag"
"fmt"
"log"
"net/http"
_ "net/http/pprof"
"runtime"
"sync"
"github.com/uber/tchannel-go"
"github.com/uber/tchannel-go/raw"
"golang.org/x/net/context"
)
var (
flagHost = flag.String("host", "localhost", "The hostname to listen on")
flagPort = flag.Int("port", 12345, "The base port to listen on")
flagInstances = flag.Int("instances", 1, "The number of instances to start")
flagOSThreads = flag.Int("numThreads", 1, "The number of OS threads to use (sets GOMAXPROCS)")
)
func main() {
flag.Parse()
runtime.GOMAXPROCS(*flagOSThreads)
// Sets up a listener for pprof.
go func() {
log.Printf("server pprof endpoint failed: %v", http.ListenAndServe("localhost:6060", nil))
}()
for i := 0; i < *flagInstances; i++ {
if err := setupServer(*flagHost, *flagPort, i); err != nil {
log.Fatalf("setupServer %v failed: %v", i, err)
}
}
log.Printf("server config: %v threads listening on %v:%v", *flagOSThreads, *flagHost, *flagPort)
// Listen indefinitely.
select {}
}
func setupServer(host string, basePort, instanceNum int) error {
hostPort := fmt.Sprintf("%s:%v", host, basePort+instanceNum)
ch, err := tchannel.NewChannel("benchmark", &tchannel.ChannelOptions{
ProcessName: fmt.Sprintf("benchmark-%v", instanceNum),
})
if err != nil {
return fmt.Errorf("NewChannel failed: %v", err)
}
handler := raw.Wrap(&kvHandler{vals: make(map[string]string)})
ch.Register(handler, "ping")
ch.Register(handler, "get")
ch.Register(handler, "set")
if err := ch.ListenAndServe(hostPort); err != nil {
return fmt.Errorf("ListenAndServe failed: %v", err)
}
return nil
}
type kvHandler struct {
sync.RWMutex
vals map[string]string
}
func (h *kvHandler) WithLock(write bool, f func()) {
if write {
h.Lock()
} else {
h.RLock()
}
f()
if write {
h.Unlock()
} else {
h.RUnlock()
}
}
func (h *kvHandler) Ping(ctx context.Context, args *raw.Args) (*raw.Res, error) {
return &raw.Res{
Arg2: []byte("pong"),
}, nil
}
func (h *kvHandler) Get(ctx context.Context, args *raw.Args) (*raw.Res, error) {
var arg3 []byte
h.WithLock(false /* write */, func() {
arg3 = []byte(h.vals[string(args.Arg2)])
})
return &raw.Res{
Arg2: []byte(fmt.Sprint(len(arg3))),
Arg3: arg3,
}, nil
}
func (h *kvHandler) Set(ctx context.Context, args *raw.Args) (*raw.Res, error) {
h.WithLock(true /* write */, func() {
h.vals[string(args.Arg2)] = string(args.Arg3)
})
return &raw.Res{
Arg2: []byte("ok"),
Arg3: []byte("really ok"),
}, nil
}
func (h *kvHandler) Handle(ctx context.Context, args *raw.Args) (*raw.Res, error) {
switch args.Method {
case "ping":
return h.Ping(ctx, args)
case "get":
return h.Get(ctx, args)
case "put":
return h.Set(ctx, args)
default:
return nil, errors.New("unknown method")
}
}
func (h *kvHandler) OnError(ctx context.Context, err error) {
log.Fatalf("OnError %v", err)
}