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package jsonrpc
import (
"encoding/json"
"fmt"
"net"
"testing"
"time"
"github.com/cenkalti/rpc2"
)
const (
network = "tcp4"
addr = "127.0.0.1:5001"
)
func TestJSONRPC(t *testing.T) {
type Args struct{ A, B int }
type Reply int
lis, err := net.Listen(network, addr)
if err != nil {
t.Fatal(err)
}
srv := rpc2.NewServer()
srv.Handle("add", func(client *rpc2.Client, args *Args, reply *Reply) error {
*reply = Reply(args.A + args.B)
var rep Reply
err := client.Call("mult", Args{2, 3}, &rep)
if err != nil {
t.Fatal(err)
}
if rep != 6 {
t.Fatalf("not expected: %d", rep)
}
return nil
})
srv.Handle("addPos", func(client *rpc2.Client, args []interface{}, result *float64) error {
*result = args[0].(float64) + args[1].(float64)
return nil
})
srv.Handle("rawArgs", func(client *rpc2.Client, args []json.RawMessage, reply *[]string) error {
for _, p := range args {
var str string
json.Unmarshal(p, &str)
*reply = append(*reply, str)
}
return nil
})
srv.Handle("typedArgs", func(client *rpc2.Client, args []int, reply *[]string) error {
for _, p := range args {
*reply = append(*reply, fmt.Sprintf("%d", p))
}
return nil
})
srv.Handle("nilArgs", func(client *rpc2.Client, args []interface{}, reply *[]string) error {
for _, v := range args {
if v == nil {
*reply = append(*reply, "nil")
}
}
return nil
})
number := make(chan int, 1)
srv.Handle("set", func(client *rpc2.Client, i int, _ *struct{}) error {
number <- i
return nil
})
go func() {
conn, err := lis.Accept()
if err != nil {
t.Fatal(err)
}
srv.ServeCodec(NewJSONCodec(conn))
}()
conn, err := net.Dial(network, addr)
if err != nil {
t.Fatal(err)
}
clt := rpc2.NewClientWithCodec(NewJSONCodec(conn))
clt.Handle("mult", func(client *rpc2.Client, args *Args, reply *Reply) error {
*reply = Reply(args.A * args.B)
return nil
})
go clt.Run()
// Test Call.
var rep Reply
err = clt.Call("add", Args{1, 2}, &rep)
if err != nil {
t.Fatal(err)
}
if rep != 3 {
t.Fatalf("not expected: %d", rep)
}
// Test notification.
err = clt.Notify("set", 6)
if err != nil {
t.Fatal(err)
}
select {
case i := <-number:
if i != 6 {
t.Fatalf("unexpected number: %d", i)
}
case <-time.After(time.Second):
t.Fatal("did not get notification")
}
// Test undefined method.
err = clt.Call("foo", 1, &rep)
if err.Error() != "rpc2: can't find method foo" {
t.Fatal(err)
}
// Test Positional arguments.
var result float64
err = clt.Call("addPos", []interface{}{1, 2}, &result)
if err != nil {
t.Fatal(err)
}
if result != 3 {
t.Fatalf("not expected: %f", result)
}
testArgs := func(expected, reply []string) error {
if len(reply) != len(expected) {
return fmt.Errorf("incorrect reply length: %d", len(reply))
}
for i := range expected {
if reply[i] != expected[i] {
return fmt.Errorf("not expected reply[%d]: %s", i, reply[i])
}
}
return nil
}
// Test raw arguments (partial unmarshal)
var reply []string
var expected []string = []string{"arg1", "arg2"}
rawArgs := json.RawMessage(`["arg1", "arg2"]`)
err = clt.Call("rawArgs", rawArgs, &reply)
if err != nil {
t.Fatal(err)
}
if err = testArgs(expected, reply); err != nil {
t.Fatal(err)
}
// Test typed arguments
reply = []string{}
expected = []string{"1", "2"}
typedArgs := []int{1, 2}
err = clt.Call("typedArgs", typedArgs, &reply)
if err != nil {
t.Fatal(err)
}
if err = testArgs(expected, reply); err != nil {
t.Fatal(err)
}
// Test nil args
reply = []string{}
expected = []string{"nil"}
err = clt.Call("nilArgs", nil, &reply)
if err != nil {
t.Fatal(err)
}
if err = testArgs(expected, reply); err != nil {
t.Fatal(err)
}
}
|
