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client.go
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client.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 (
"bufio"
"fmt"
"log"
"os"
"strings"
"time"
"github.com/uber/tchannel-go"
"github.com/uber/tchannel-go/examples/keyvalue/gen-go/keyvalue"
"github.com/uber/tchannel-go/hyperbahn"
"github.com/uber/tchannel-go/thrift"
)
var curUser = "anonymous"
func printHelp() {
fmt.Println("Usage:\n get [key]\n set [key] [value]")
fmt.Println(" user [newUser]\n clearAll")
}
func main() {
// Create a TChannel.
ch, err := tchannel.NewChannel("keyvalue-client", nil)
if err != nil {
log.Fatalf("Failed to create tchannel: %v", err)
}
// Set up Hyperbahn client.
config := hyperbahn.Configuration{InitialNodes: os.Args[1:]}
if len(config.InitialNodes) == 0 {
log.Fatalf("No Autobahn nodes to connect to given")
}
hyperbahn.NewClient(ch, config, nil)
thriftClient := thrift.NewClient(ch, "keyvalue", nil)
client := keyvalue.NewTChanKeyValueClient(thriftClient)
adminClient := keyvalue.NewTChanAdminClient(thriftClient)
// Read commands from the command line and execute them.
scanner := bufio.NewScanner(os.Stdin)
printHelp()
fmt.Printf("> ")
for scanner.Scan() {
parts := strings.Split(scanner.Text(), " ")
if parts[0] == "" {
continue
}
switch parts[0] {
case "help":
printHelp()
case "get":
if len(parts) < 2 {
printHelp()
break
}
get(client, parts[1])
case "set":
if len(parts) < 3 {
printHelp()
break
}
set(client, parts[1], parts[2])
case "user":
if len(parts) < 2 {
printHelp()
break
}
curUser = parts[1]
case "clearAll":
clear(adminClient)
default:
log.Printf("Unsupported command %q\n", parts[0])
}
fmt.Print("> ")
}
scanner.Text()
}
func get(client keyvalue.TChanKeyValue, key string) {
ctx, cancel := createContext()
defer cancel()
val, err := client.Get(ctx, key)
if err != nil {
switch err := err.(type) {
case *keyvalue.InvalidKey:
log.Printf("Get %v failed: invalid key", key)
case *keyvalue.KeyNotFound:
log.Printf("Get %v failed: key not found", key)
default:
log.Printf("Get %v failed unexpectedly: %v", key, err)
}
return
}
log.Printf("Get %v: %v", key, val)
}
func set(client keyvalue.TChanKeyValue, key, value string) {
ctx, cancel := createContext()
defer cancel()
if err := client.Set(ctx, key, value); err != nil {
switch err := err.(type) {
case *keyvalue.InvalidKey:
log.Printf("Set %v failed: invalid key", key)
default:
log.Printf("Set %v:%v failed unexpectedly: %#v", key, value, err)
}
return
}
log.Printf("Set %v:%v succeeded with headers: %v", key, value, ctx.ResponseHeaders())
}
func clear(adminClient keyvalue.TChanAdmin) {
ctx, cancel := createContext()
defer cancel()
if err := adminClient.ClearAll(ctx); err != nil {
switch err := err.(type) {
case *keyvalue.NotAuthorized:
log.Printf("You are not authorized to perform this method")
default:
log.Printf("ClearAll failed unexpectedly: %v", err)
}
return
}
log.Printf("ClearAll completed, all keys cleared")
}
func createContext() (thrift.Context, func()) {
ctx, cancel := thrift.NewContext(time.Second)
ctx = thrift.WithHeaders(ctx, map[string]string{"user": curUser})
return ctx, cancel
}