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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package jsonrpc2_test
import (
"context"
"encoding/json"
"flag"
"fmt"
"io"
"path"
"reflect"
"testing"
"golang.org/x/tools/internal/jsonrpc2"
)
var logRPC = flag.Bool("logrpc", false, "Enable jsonrpc2 communication logging")
type callTest struct {
method string
params interface{}
expect interface{}
}
var callTests = []callTest{
{"no_args", nil, true},
{"one_string", "fish", "got:fish"},
{"one_number", 10, "got:10"},
{"join", []string{"a", "b", "c"}, "a/b/c"},
//TODO: expand the test cases
}
func (test *callTest) newResults() interface{} {
switch e := test.expect.(type) {
case []interface{}:
var r []interface{}
for _, v := range e {
r = append(r, reflect.New(reflect.TypeOf(v)).Interface())
}
return r
case nil:
return nil
default:
return reflect.New(reflect.TypeOf(test.expect)).Interface()
}
}
func (test *callTest) verifyResults(t *testing.T, results interface{}) {
if results == nil {
return
}
val := reflect.Indirect(reflect.ValueOf(results)).Interface()
if !reflect.DeepEqual(val, test.expect) {
t.Errorf("%v:Results are incorrect, got %+v expect %+v", test.method, val, test.expect)
}
}
func TestPlainCall(t *testing.T) {
ctx := context.Background()
a, b := prepare(ctx, t, false)
for _, test := range callTests {
results := test.newResults()
if err := a.Call(ctx, test.method, test.params, results); err != nil {
t.Fatalf("%v:Call failed: %v", test.method, err)
}
test.verifyResults(t, results)
if err := b.Call(ctx, test.method, test.params, results); err != nil {
t.Fatalf("%v:Call failed: %v", test.method, err)
}
test.verifyResults(t, results)
}
}
func TestHeaderCall(t *testing.T) {
ctx := context.Background()
a, b := prepare(ctx, t, true)
for _, test := range callTests {
results := test.newResults()
if err := a.Call(ctx, test.method, test.params, results); err != nil {
t.Fatalf("%v:Call failed: %v", test.method, err)
}
test.verifyResults(t, results)
if err := b.Call(ctx, test.method, test.params, results); err != nil {
t.Fatalf("%v:Call failed: %v", test.method, err)
}
test.verifyResults(t, results)
}
}
func prepare(ctx context.Context, t *testing.T, withHeaders bool) (*testHandler, *testHandler) {
a := &testHandler{t: t}
b := &testHandler{t: t}
a.reader, b.writer = io.Pipe()
b.reader, a.writer = io.Pipe()
for _, h := range []*testHandler{a, b} {
h := h
if withHeaders {
h.stream = jsonrpc2.NewHeaderStream(h.reader, h.writer)
} else {
h.stream = jsonrpc2.NewStream(h.reader, h.writer)
}
args := []interface{}{jsonrpc2.Handler(handle)}
if *logRPC {
args = append(args, jsonrpc2.Log)
}
h.Conn = jsonrpc2.NewConn(ctx, h.stream, args...)
go func() {
defer func() {
h.reader.Close()
h.writer.Close()
}()
if err := h.Conn.Wait(ctx); err != nil {
t.Fatalf("Stream failed: %v", err)
}
}()
}
return a, b
}
type testHandler struct {
t *testing.T
reader *io.PipeReader
writer *io.PipeWriter
stream jsonrpc2.Stream
*jsonrpc2.Conn
}
func handle(ctx context.Context, c *jsonrpc2.Conn, r *jsonrpc2.Request) {
switch r.Method {
case "no_args":
if r.Params != nil {
c.Reply(ctx, r, nil, jsonrpc2.NewErrorf(jsonrpc2.CodeInvalidParams, "Expected no params"))
return
}
c.Reply(ctx, r, true, nil)
case "one_string":
var v string
if err := json.Unmarshal(*r.Params, &v); err != nil {
c.Reply(ctx, r, nil, jsonrpc2.NewErrorf(jsonrpc2.CodeParseError, "%v", err.Error()))
return
}
c.Reply(ctx, r, "got:"+v, nil)
case "one_number":
var v int
if err := json.Unmarshal(*r.Params, &v); err != nil {
c.Reply(ctx, r, nil, jsonrpc2.NewErrorf(jsonrpc2.CodeParseError, "%v", err.Error()))
return
}
c.Reply(ctx, r, fmt.Sprintf("got:%d", v), nil)
case "join":
var v []string
if err := json.Unmarshal(*r.Params, &v); err != nil {
c.Reply(ctx, r, nil, jsonrpc2.NewErrorf(jsonrpc2.CodeParseError, "%v", err.Error()))
return
}
c.Reply(ctx, r, path.Join(v...), nil)
default:
c.Reply(ctx, r, nil, jsonrpc2.NewErrorf(jsonrpc2.CodeMethodNotFound, "method %q not found", r.Method))
}
}
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