297 lines
6.5 KiB
Go
297 lines
6.5 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package jsonrpc
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net"
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"net/rpc"
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"strings"
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"testing"
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)
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type Args struct {
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A, B int
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}
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type Reply struct {
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C int
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}
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type Arith int
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type ArithAddResp struct {
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Id interface{} `json:"id"`
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Result Reply `json:"result"`
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Error interface{} `json:"error"`
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}
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func (t *Arith) Add(args *Args, reply *Reply) error {
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reply.C = args.A + args.B
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return nil
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}
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func (t *Arith) Mul(args *Args, reply *Reply) error {
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reply.C = args.A * args.B
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return nil
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}
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func (t *Arith) Div(args *Args, reply *Reply) error {
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if args.B == 0 {
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return errors.New("divide by zero")
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}
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reply.C = args.A / args.B
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return nil
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}
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func (t *Arith) Error(args *Args, reply *Reply) error {
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panic("ERROR")
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}
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func init() {
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rpc.Register(new(Arith))
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}
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func TestServerNoParams(t *testing.T) {
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cli, srv := net.Pipe()
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defer cli.Close()
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go ServeConn(srv)
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dec := json.NewDecoder(cli)
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fmt.Fprintf(cli, `{"method": "Arith.Add", "id": "123"}`)
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var resp ArithAddResp
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if err := dec.Decode(&resp); err != nil {
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t.Fatalf("Decode after no params: %s", err)
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}
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if resp.Error == nil {
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t.Fatalf("Expected error, got nil")
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}
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}
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func TestServerEmptyMessage(t *testing.T) {
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cli, srv := net.Pipe()
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defer cli.Close()
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go ServeConn(srv)
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dec := json.NewDecoder(cli)
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fmt.Fprintf(cli, "{}")
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var resp ArithAddResp
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if err := dec.Decode(&resp); err != nil {
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t.Fatalf("Decode after empty: %s", err)
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}
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if resp.Error == nil {
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t.Fatalf("Expected error, got nil")
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}
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}
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func TestServer(t *testing.T) {
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cli, srv := net.Pipe()
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defer cli.Close()
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go ServeConn(srv)
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dec := json.NewDecoder(cli)
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// Send hand-coded requests to server, parse responses.
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for i := 0; i < 10; i++ {
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fmt.Fprintf(cli, `{"method": "Arith.Add", "id": "\u%04d", "params": [{"A": %d, "B": %d}]}`, i, i, i+1)
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var resp ArithAddResp
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err := dec.Decode(&resp)
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if err != nil {
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t.Fatalf("Decode: %s", err)
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}
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if resp.Error != nil {
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t.Fatalf("resp.Error: %s", resp.Error)
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}
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if resp.Id.(string) != string(i) {
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t.Fatalf("resp: bad id %q want %q", resp.Id.(string), string(i))
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}
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if resp.Result.C != 2*i+1 {
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t.Fatalf("resp: bad result: %d+%d=%d", i, i+1, resp.Result.C)
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}
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}
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}
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func TestClient(t *testing.T) {
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// Assume server is okay (TestServer is above).
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// Test client against server.
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cli, srv := net.Pipe()
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go ServeConn(srv)
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client := NewClient(cli)
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defer client.Close()
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// Synchronous calls
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args := &Args{7, 8}
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reply := new(Reply)
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err := client.Call("Arith.Add", args, reply)
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if err != nil {
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t.Errorf("Add: expected no error but got string %q", err.Error())
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}
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if reply.C != args.A+args.B {
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t.Errorf("Add: got %d expected %d", reply.C, args.A+args.B)
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}
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args = &Args{7, 8}
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reply = new(Reply)
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err = client.Call("Arith.Mul", args, reply)
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if err != nil {
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t.Errorf("Mul: expected no error but got string %q", err.Error())
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}
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if reply.C != args.A*args.B {
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t.Errorf("Mul: got %d expected %d", reply.C, args.A*args.B)
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}
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// Out of order.
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args = &Args{7, 8}
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mulReply := new(Reply)
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mulCall := client.Go("Arith.Mul", args, mulReply, nil)
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addReply := new(Reply)
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addCall := client.Go("Arith.Add", args, addReply, nil)
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addCall = <-addCall.Done
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if addCall.Error != nil {
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t.Errorf("Add: expected no error but got string %q", addCall.Error.Error())
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}
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if addReply.C != args.A+args.B {
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t.Errorf("Add: got %d expected %d", addReply.C, args.A+args.B)
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}
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mulCall = <-mulCall.Done
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if mulCall.Error != nil {
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t.Errorf("Mul: expected no error but got string %q", mulCall.Error.Error())
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}
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if mulReply.C != args.A*args.B {
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t.Errorf("Mul: got %d expected %d", mulReply.C, args.A*args.B)
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}
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// Error test
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args = &Args{7, 0}
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reply = new(Reply)
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err = client.Call("Arith.Div", args, reply)
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// expect an error: zero divide
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if err == nil {
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t.Error("Div: expected error")
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} else if err.Error() != "divide by zero" {
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t.Error("Div: expected divide by zero error; got", err)
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}
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}
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func TestMalformedInput(t *testing.T) {
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cli, srv := net.Pipe()
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go cli.Write([]byte(`{id:1}`)) // invalid json
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ServeConn(srv) // must return, not loop
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}
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func TestMalformedOutput(t *testing.T) {
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cli, srv := net.Pipe()
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go srv.Write([]byte(`{"id":0,"result":null,"error":null}`))
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go ioutil.ReadAll(srv)
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client := NewClient(cli)
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defer client.Close()
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args := &Args{7, 8}
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reply := new(Reply)
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err := client.Call("Arith.Add", args, reply)
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if err == nil {
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t.Error("expected error")
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}
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}
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func TestServerErrorHasNullResult(t *testing.T) {
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var out bytes.Buffer
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sc := NewServerCodec(struct {
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io.Reader
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io.Writer
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io.Closer
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}{
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Reader: strings.NewReader(`{"method": "Arith.Add", "id": "123", "params": []}`),
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Writer: &out,
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Closer: ioutil.NopCloser(nil),
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})
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r := new(rpc.Request)
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if err := sc.ReadRequestHeader(r); err != nil {
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t.Fatal(err)
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}
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const valueText = "the value we don't want to see"
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const errorText = "some error"
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err := sc.WriteResponse(&rpc.Response{
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ServiceMethod: "Method",
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Seq: 1,
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Error: errorText,
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}, valueText)
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if err != nil {
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t.Fatal(err)
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}
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if !strings.Contains(out.String(), errorText) {
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t.Fatalf("Response didn't contain expected error %q: %s", errorText, &out)
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}
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if strings.Contains(out.String(), valueText) {
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t.Errorf("Response contains both an error and value: %s", &out)
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}
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}
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func TestUnexpectedError(t *testing.T) {
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cli, srv := myPipe()
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go cli.PipeWriter.CloseWithError(errors.New("unexpected error!")) // reader will get this error
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ServeConn(srv) // must return, not loop
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}
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// Copied from package net.
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func myPipe() (*pipe, *pipe) {
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r1, w1 := io.Pipe()
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r2, w2 := io.Pipe()
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return &pipe{r1, w2}, &pipe{r2, w1}
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}
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type pipe struct {
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*io.PipeReader
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*io.PipeWriter
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}
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type pipeAddr int
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func (pipeAddr) Network() string {
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return "pipe"
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}
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func (pipeAddr) String() string {
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return "pipe"
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}
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func (p *pipe) Close() error {
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err := p.PipeReader.Close()
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err1 := p.PipeWriter.Close()
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if err == nil {
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err = err1
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}
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return err
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}
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func (p *pipe) LocalAddr() net.Addr {
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return pipeAddr(0)
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}
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func (p *pipe) RemoteAddr() net.Addr {
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return pipeAddr(0)
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}
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func (p *pipe) SetTimeout(nsec int64) error {
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return errors.New("net.Pipe does not support timeouts")
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}
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func (p *pipe) SetReadTimeout(nsec int64) error {
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return errors.New("net.Pipe does not support timeouts")
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}
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func (p *pipe) SetWriteTimeout(nsec int64) error {
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return errors.New("net.Pipe does not support timeouts")
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}
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