/
kvclientmain.go
111 lines (93 loc) · 2.68 KB
/
kvclientmain.go
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// Simple client to connect to the key-value service and exercise the
// key-value RPC API (put/get/test-set).
//
// Usage: go run kvclientmain.go [ip:port]
//
// - [ip:port] : the ip and TCP port on which the KV service is
// listening for client connections.
//
// TODOs:
// - Needs refactoring and optional support for vector-timestamps.
package main
import (
"fmt"
"net/rpc"
"os"
)
// args in get(args)
type GetArgs struct {
Key string // key to look up
}
// args in put(args)
type PutArgs struct {
Key string // key to associate value with
Val string // value
}
// args in testset(args)
type TestSetArgs struct {
Key string // key to test
TestVal string // value to test against actual value
NewVal string // value to use if testval equals to actual value
}
// Reply from service for all three API calls above.
type ValReply struct {
Val string // value; depends on the call
}
type KeyValService int
// Main server loop.
func main() {
// parse args
usage := fmt.Sprintf("Usage: %s ip:port\n", os.Args[0])
if len(os.Args) != 2 {
fmt.Printf(usage)
os.Exit(1)
}
kvAddr := os.Args[1]
// Connect to the KV-service via RPC.
kvService, err := rpc.Dial("tcp", kvAddr)
checkError(err)
// Use kvVal for all RPC replies.
var kvVal ValReply
// Get("my-key")
getArgs := GetArgs{"my-key"}
err = kvService.Call("KeyValService.Get", getArgs, &kvVal)
checkError(err)
fmt.Println("KV.get(" + getArgs.Key + ") = " + kvVal.Val)
// Put("my-key", 2016)
putArgs := PutArgs{
Key: "my-key",
Val: "party-like-its-416"}
err = kvService.Call("KeyValService.Put", putArgs, &kvVal)
checkError(err)
fmt.Println("KV.put(" + putArgs.Key + "," + putArgs.Val + ") = " + kvVal.Val)
// Get("my-key")
getArgs = GetArgs{
Key: "my-key"}
err = kvService.Call("KeyValService.Get", getArgs, &kvVal)
checkError(err)
fmt.Println("KV.get(" + getArgs.Key + ") = " + kvVal.Val)
// TestSet("my-key", "foo", "bar")
tsArgs := TestSetArgs{
Key: "my-key",
TestVal: "foo",
NewVal: "bar"}
err = kvService.Call("KeyValService.TestSet", tsArgs, &kvVal)
checkError(err)
fmt.Println("KV.get(" + tsArgs.Key + "," + tsArgs.TestVal + "," + tsArgs.NewVal + ") = " + kvVal.Val)
// TestSet("my-key", "party-like-its-416", "bar")
tsArgs = TestSetArgs{
Key: "my-key",
TestVal: "party-like-its-416",
NewVal: "bar"}
err = kvService.Call("KeyValService.Get", tsArgs, &kvVal)
checkError(err)
fmt.Println("KV.get(" + tsArgs.Key + "," + tsArgs.TestVal + "," + tsArgs.NewVal + ") = " + kvVal.Val)
fmt.Println("\nMission accomplished.")
}
// If error is non-nil, print it out and halt.
func checkError(err error) {
if err != nil {
fmt.Fprintf(os.Stderr, "Error ", err.Error())
os.Exit(1)
}
}