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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"
"net"
"path"
"reflect"
"testing"
"golang.org/x/tools/internal/event/export/eventtest"
"golang.org/x/tools/internal/jsonrpc2"
"golang.org/x/tools/internal/stack/stacktest"
)
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 TestCall(t *testing.T) {
stacktest.NoLeak(t)
ctx := eventtest.NewContext(context.Background(), t)
for _, headers := range []bool{false, true} {
name := "Plain"
if headers {
name = "Headers"
}
t.Run(name, func(t *testing.T) {
ctx := eventtest.NewContext(ctx, t)
a, b, done := prepare(ctx, t, headers)
defer done()
for _, test := range callTests {
t.Run(test.method, func(t *testing.T) {
ctx := eventtest.NewContext(ctx, t)
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) (jsonrpc2.Conn, jsonrpc2.Conn, func()) {
// make a wait group that can be used to wait for the system to shut down
aPipe, bPipe := net.Pipe()
a := run(ctx, withHeaders, aPipe)
b := run(ctx, withHeaders, bPipe)
return a, b, func() {
a.Close()
b.Close()
<-a.Done()
<-b.Done()
}
}
func run(ctx context.Context, withHeaders bool, nc net.Conn) jsonrpc2.Conn {
var stream jsonrpc2.Stream
if withHeaders {
stream = jsonrpc2.NewHeaderStream(nc)
} else {
stream = jsonrpc2.NewRawStream(nc)
}
conn := jsonrpc2.NewConn(stream)
conn.Go(ctx, testHandler(*logRPC))
return conn
}
func testHandler(log bool) jsonrpc2.Handler {
return func(ctx context.Context, reply jsonrpc2.Replier, req jsonrpc2.Request) error {
switch req.Method() {
case "no_args":
if len(req.Params()) > 0 {
return reply(ctx, nil, fmt.Errorf("%w: expected no params", jsonrpc2.ErrInvalidParams))
}
return reply(ctx, true, nil)
case "one_string":
var v string
if err := json.Unmarshal(req.Params(), &v); err != nil {
return reply(ctx, nil, fmt.Errorf("%w: %s", jsonrpc2.ErrParse, err))
}
return reply(ctx, "got:"+v, nil)
case "one_number":
var v int
if err := json.Unmarshal(req.Params(), &v); err != nil {
return reply(ctx, nil, fmt.Errorf("%w: %s", jsonrpc2.ErrParse, err))
}
return reply(ctx, fmt.Sprintf("got:%d", v), nil)
case "join":
var v []string
if err := json.Unmarshal(req.Params(), &v); err != nil {
return reply(ctx, nil, fmt.Errorf("%w: %s", jsonrpc2.ErrParse, err))
}
return reply(ctx, path.Join(v...), nil)
default:
return jsonrpc2.MethodNotFound(ctx, reply, req)
}
}
}
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