whatcanGOwrong

This commit is contained in:
2024-09-19 21:38:24 -04:00
commit d0ae4d841d
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This starts a mock DAP server that runs indefinitely, accepts DAP
// requests and responds with dummy or error responses.
package main
import (
"flag"
"log"
)
func main() {
port := flag.String("port", "54321", "TCP port to listen on")
flag.Parse()
err := server(*port)
if err != nil {
log.Fatal("Could not start server: ", err)
}
}
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This file defines helpers and request handlers for a dummy server
// that accepts DAP requests and responds with dummy or error responses.
// Fake-supported requests:
// - initialize
// - launch
// - setBreakpoints
// - setExceptionBreakpoints
// - configurationDone
// - threads
// - stackTrace
// - scopes
// - variables
// - continue
// - disconnect
// All other requests result in ErrorResponse's.
//
// The server uses the following goroutines:
// - "main" goroutine accepts client connections one by one and
// handles them serially by reading and decoding incoming requests
// and dispatching each one to a new goroutine for further
// processing.
// - per-request goroutines process each request as if
// letting fake debugger take over. They send events and responses
// via the sender goroutine.
// - sender goroutine listens for messages to send and
// writes them to the client connection.
//
package main
import (
"bufio"
"io"
"log"
"net"
"sync"
"time"
"github.com/google/go-dap"
)
// server starts a server that listens on a specified port
// and blocks indefinitely. This server can accept multiple
// client connections at the same time.
func server(port string) error {
listener, err := net.Listen("tcp", ":"+port)
if err != nil {
return err
}
defer listener.Close()
log.Println("Started server at", listener.Addr())
for {
conn, err := listener.Accept()
if err != nil {
log.Println("Connection failed:", err)
continue
}
log.Println("Accepted connection from", conn.RemoteAddr())
// Handle multiple client connections concurrently
go handleConnection(conn)
}
}
// handleConnection handles a connection from a single client.
// It reads and decodes the incoming data and dispatches it
// to per-request processing goroutines. It also launches the
// sender goroutine to send resulting messages over the connection
// back to the client.
func handleConnection(conn net.Conn) {
debugSession := fakeDebugSession{
rw: bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn)),
sendQueue: make(chan dap.Message),
stopDebug: make(chan struct{}),
}
go debugSession.sendFromQueue()
for {
err := debugSession.handleRequest()
// TODO(polina): check for connection vs decoding error?
if err != nil {
if err == io.EOF {
log.Println("No more data to read:", err)
break
}
// There maybe more messages to process, but
// we will start with the strict behavior of only accepting
// expected inputs.
log.Fatal("Server error: ", err)
}
}
log.Println("Closing connection from", conn.RemoteAddr())
close(debugSession.stopDebug)
debugSession.sendWg.Wait()
close(debugSession.sendQueue)
conn.Close()
}
func (ds *fakeDebugSession) handleRequest() error {
log.Println("Reading request...")
request, err := dap.ReadProtocolMessage(ds.rw.Reader)
if err != nil {
return err
}
log.Printf("Received request\n\t%#v\n", request)
ds.sendWg.Add(1)
go func() {
ds.dispatchRequest(request)
ds.sendWg.Done()
}()
return nil
}
// dispatchRequest launches a new goroutine to process each request
// and send back events and responses.
func (ds *fakeDebugSession) dispatchRequest(request dap.Message) {
switch request := request.(type) {
case *dap.InitializeRequest:
ds.onInitializeRequest(request)
case *dap.LaunchRequest:
ds.onLaunchRequest(request)
case *dap.AttachRequest:
ds.onAttachRequest(request)
case *dap.DisconnectRequest:
ds.onDisconnectRequest(request)
case *dap.TerminateRequest:
ds.onTerminateRequest(request)
case *dap.RestartRequest:
ds.onRestartRequest(request)
case *dap.SetBreakpointsRequest:
ds.onSetBreakpointsRequest(request)
case *dap.SetFunctionBreakpointsRequest:
ds.onSetFunctionBreakpointsRequest(request)
case *dap.SetExceptionBreakpointsRequest:
ds.onSetExceptionBreakpointsRequest(request)
case *dap.ConfigurationDoneRequest:
ds.onConfigurationDoneRequest(request)
case *dap.ContinueRequest:
ds.onContinueRequest(request)
case *dap.NextRequest:
ds.onNextRequest(request)
case *dap.StepInRequest:
ds.onStepInRequest(request)
case *dap.StepOutRequest:
ds.onStepOutRequest(request)
case *dap.StepBackRequest:
ds.onStepBackRequest(request)
case *dap.ReverseContinueRequest:
ds.onReverseContinueRequest(request)
case *dap.RestartFrameRequest:
ds.onRestartFrameRequest(request)
case *dap.GotoRequest:
ds.onGotoRequest(request)
case *dap.PauseRequest:
ds.onPauseRequest(request)
case *dap.StackTraceRequest:
ds.onStackTraceRequest(request)
case *dap.ScopesRequest:
ds.onScopesRequest(request)
case *dap.VariablesRequest:
ds.onVariablesRequest(request)
case *dap.SetVariableRequest:
ds.onSetVariableRequest(request)
case *dap.SetExpressionRequest:
ds.onSetExpressionRequest(request)
case *dap.SourceRequest:
ds.onSourceRequest(request)
case *dap.ThreadsRequest:
ds.onThreadsRequest(request)
case *dap.TerminateThreadsRequest:
ds.onTerminateThreadsRequest(request)
case *dap.EvaluateRequest:
ds.onEvaluateRequest(request)
case *dap.StepInTargetsRequest:
ds.onStepInTargetsRequest(request)
case *dap.GotoTargetsRequest:
ds.onGotoTargetsRequest(request)
case *dap.CompletionsRequest:
ds.onCompletionsRequest(request)
case *dap.ExceptionInfoRequest:
ds.onExceptionInfoRequest(request)
case *dap.LoadedSourcesRequest:
ds.onLoadedSourcesRequest(request)
case *dap.DataBreakpointInfoRequest:
ds.onDataBreakpointInfoRequest(request)
case *dap.SetDataBreakpointsRequest:
ds.onSetDataBreakpointsRequest(request)
case *dap.ReadMemoryRequest:
ds.onReadMemoryRequest(request)
case *dap.DisassembleRequest:
ds.onDisassembleRequest(request)
case *dap.CancelRequest:
ds.onCancelRequest(request)
case *dap.BreakpointLocationsRequest:
ds.onBreakpointLocationsRequest(request)
default:
log.Fatalf("Unable to process %#v", request)
}
}
// send lets the sender goroutine know via a channel that there is
// a message to be sent to client. This is called by per-request
// goroutines to send events and responses for each request and
// to notify of events triggered by the fake debugger.
func (ds *fakeDebugSession) send(message dap.Message) {
ds.sendQueue <- message
}
// sendFromQueue is to be run in a separate goroutine to listen on a
// channel for messages to send back to the client. It will
// return once the channel is closed.
func (ds *fakeDebugSession) sendFromQueue() {
for message := range ds.sendQueue {
dap.WriteProtocolMessage(ds.rw.Writer, message)
log.Printf("Message sent\n\t%#v\n", message)
ds.rw.Flush()
}
}
// -----------------------------------------------------------------------
// Very Fake Debugger
//
// The debugging session will keep track of how many breakpoints
// have been set. Once start-up is done (i.e. configurationDone
// request is processed), it will "stop" at each breakpoint one by
// one, and once there are no more, it will trigger a terminated event.
type fakeDebugSession struct {
// rw is used to read requests and write events/responses
rw *bufio.ReadWriter
// sendQueue is used to capture messages from multiple request
// processing goroutines while writing them to the client connection
// from a single goroutine via sendFromQueue. We must keep track of
// the multiple channel senders with a wait group to make sure we do
// not close this channel prematurely. Closing this channel will signal
// the sendFromQueue goroutine that it can exit.
sendQueue chan dap.Message
sendWg sync.WaitGroup
// stopDebug is used to notify long-running handlers to stop processing.
stopDebug chan struct{}
// bpSet is a counter of the remaining breakpoints that the debug
// session is yet to stop at before the program terminates.
bpSet int
bpSetMux sync.Mutex
}
// doContinue allows fake program execution to continue when the program
// is started or unpaused. It simulates events from the debug session
// by "stopping" on a breakpoint or terminating if there are no more
// breakpoints. Safe to use concurrently.
func (ds *fakeDebugSession) doContinue() {
var e dap.Message
ds.bpSetMux.Lock()
if ds.bpSet == 0 {
// Pretend that the program is running.
// The delay will allow for all in-flight responses
// to be sent before termination.
time.Sleep(1000 * time.Millisecond)
e = &dap.TerminatedEvent{
Event: *newEvent("terminated"),
}
} else {
e = &dap.StoppedEvent{
Event: *newEvent("stopped"),
Body: dap.StoppedEventBody{Reason: "breakpoint", ThreadId: 1, AllThreadsStopped: true},
}
ds.bpSet--
}
ds.bpSetMux.Unlock()
ds.send(e)
}
// -----------------------------------------------------------------------
// Request Handlers
//
// Below is a dummy implementation of the request handlers.
// They take no action, but just return dummy responses.
// A real debug adaptor would call the debugger methods here
// and use their results to populate each response.
func (ds *fakeDebugSession) onInitializeRequest(request *dap.InitializeRequest) {
response := &dap.InitializeResponse{}
response.Response = *newResponse(request.Seq, request.Command)
response.Body.SupportsConfigurationDoneRequest = true
response.Body.SupportsFunctionBreakpoints = false
response.Body.SupportsConditionalBreakpoints = false
response.Body.SupportsHitConditionalBreakpoints = false
response.Body.SupportsEvaluateForHovers = false
response.Body.ExceptionBreakpointFilters = []dap.ExceptionBreakpointsFilter{}
response.Body.SupportsStepBack = false
response.Body.SupportsSetVariable = false
response.Body.SupportsRestartFrame = false
response.Body.SupportsGotoTargetsRequest = false
response.Body.SupportsStepInTargetsRequest = false
response.Body.SupportsCompletionsRequest = false
response.Body.CompletionTriggerCharacters = []string{}
response.Body.SupportsModulesRequest = false
response.Body.AdditionalModuleColumns = []dap.ColumnDescriptor{}
response.Body.SupportedChecksumAlgorithms = []dap.ChecksumAlgorithm{}
response.Body.SupportsRestartRequest = false
response.Body.SupportsExceptionOptions = false
response.Body.SupportsValueFormattingOptions = false
response.Body.SupportsExceptionInfoRequest = false
response.Body.SupportTerminateDebuggee = false
response.Body.SupportsDelayedStackTraceLoading = false
response.Body.SupportsLoadedSourcesRequest = false
response.Body.SupportsLogPoints = false
response.Body.SupportsTerminateThreadsRequest = false
response.Body.SupportsSetExpression = false
response.Body.SupportsTerminateRequest = false
response.Body.SupportsDataBreakpoints = false
response.Body.SupportsReadMemoryRequest = false
response.Body.SupportsDisassembleRequest = false
response.Body.SupportsCancelRequest = false
response.Body.SupportsBreakpointLocationsRequest = false
// This is a fake set up, so we can start "accepting" configuration
// requests for setting breakpoints, etc from the client at any time.
// Notify the client with an 'initialized' event. The client will end
// the configuration sequence with 'configurationDone' request.
e := &dap.InitializedEvent{Event: *newEvent("initialized")}
ds.send(e)
ds.send(response)
}
func (ds *fakeDebugSession) onLaunchRequest(request *dap.LaunchRequest) {
// This is where a real debug adaptor would check the soundness of the
// arguments (e.g. program from launch.json) and then use them to launch the
// debugger and attach to the program.
response := &dap.LaunchResponse{}
response.Response = *newResponse(request.Seq, request.Command)
ds.send(response)
}
func (ds *fakeDebugSession) onAttachRequest(request *dap.AttachRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "AttachRequest is not yet supported"))
}
func (ds *fakeDebugSession) onDisconnectRequest(request *dap.DisconnectRequest) {
response := &dap.DisconnectResponse{}
response.Response = *newResponse(request.Seq, request.Command)
ds.send(response)
}
func (ds *fakeDebugSession) onTerminateRequest(request *dap.TerminateRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "TerminateRequest is not yet supported"))
}
func (ds *fakeDebugSession) onRestartRequest(request *dap.RestartRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "RestartRequest is not yet supported"))
}
func (ds *fakeDebugSession) onSetBreakpointsRequest(request *dap.SetBreakpointsRequest) {
response := &dap.SetBreakpointsResponse{}
response.Response = *newResponse(request.Seq, request.Command)
response.Body.Breakpoints = make([]dap.Breakpoint, len(request.Arguments.Breakpoints))
for i, b := range request.Arguments.Breakpoints {
response.Body.Breakpoints[i].Line = b.Line
response.Body.Breakpoints[i].Verified = true
ds.bpSetMux.Lock()
ds.bpSet++
ds.bpSetMux.Unlock()
}
ds.send(response)
}
func (ds *fakeDebugSession) onSetFunctionBreakpointsRequest(request *dap.SetFunctionBreakpointsRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "SetFunctionBreakpointsRequest is not yet supported"))
}
func (ds *fakeDebugSession) onSetExceptionBreakpointsRequest(request *dap.SetExceptionBreakpointsRequest) {
response := &dap.SetExceptionBreakpointsResponse{}
response.Response = *newResponse(request.Seq, request.Command)
ds.send(response)
}
func (ds *fakeDebugSession) onConfigurationDoneRequest(request *dap.ConfigurationDoneRequest) {
// This would be the place to check if the session was configured to
// stop on entry and if that is the case, to issue a
// stopped-on-breakpoint event. This being a mock implementation,
// we "let" the program continue after sending a successful response.
e := &dap.ThreadEvent{Event: *newEvent("thread"), Body: dap.ThreadEventBody{Reason: "started", ThreadId: 1}}
ds.send(e)
response := &dap.ConfigurationDoneResponse{}
response.Response = *newResponse(request.Seq, request.Command)
ds.send(response)
ds.doContinue()
}
func (ds *fakeDebugSession) onContinueRequest(request *dap.ContinueRequest) {
response := &dap.ContinueResponse{}
response.Response = *newResponse(request.Seq, request.Command)
ds.send(response)
ds.doContinue()
}
func (ds *fakeDebugSession) onNextRequest(request *dap.NextRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "NextRequest is not yet supported"))
}
func (ds *fakeDebugSession) onStepInRequest(request *dap.StepInRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "StepInRequest is not yet supported"))
}
func (ds *fakeDebugSession) onStepOutRequest(request *dap.StepOutRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "StepOutRequest is not yet supported"))
}
func (ds *fakeDebugSession) onStepBackRequest(request *dap.StepBackRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "StepBackRequest is not yet supported"))
}
func (ds *fakeDebugSession) onReverseContinueRequest(request *dap.ReverseContinueRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "ReverseContinueRequest is not yet supported"))
}
func (ds *fakeDebugSession) onRestartFrameRequest(request *dap.RestartFrameRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "RestartFrameRequest is not yet supported"))
}
func (ds *fakeDebugSession) onGotoRequest(request *dap.GotoRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "GotoRequest is not yet supported"))
}
func (ds *fakeDebugSession) onPauseRequest(request *dap.PauseRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "PauseRequest is not yet supported"))
}
func (ds *fakeDebugSession) onStackTraceRequest(request *dap.StackTraceRequest) {
response := &dap.StackTraceResponse{}
response.Response = *newResponse(request.Seq, request.Command)
response.Body = dap.StackTraceResponseBody{
StackFrames: []dap.StackFrame{
{
Id: 1000,
Source: &dap.Source{Name: "hello.go", Path: "/Users/foo/go/src/hello/hello.go", SourceReference: 0},
Line: 5,
Column: 0,
Name: "main.main",
},
},
TotalFrames: 1,
}
ds.send(response)
}
func (ds *fakeDebugSession) onScopesRequest(request *dap.ScopesRequest) {
response := &dap.ScopesResponse{}
response.Response = *newResponse(request.Seq, request.Command)
response.Body = dap.ScopesResponseBody{
Scopes: []dap.Scope{
{Name: "Local", VariablesReference: 1000, Expensive: false},
{Name: "Global", VariablesReference: 1001, Expensive: true},
},
}
ds.send(response)
}
func (ds *fakeDebugSession) onVariablesRequest(request *dap.VariablesRequest) {
select {
case <-ds.stopDebug:
return
// simulate long-running processing to make this handler
// respond to this request after the next request is received
case <-time.After(100 * time.Millisecond):
response := &dap.VariablesResponse{}
response.Response = *newResponse(request.Seq, request.Command)
response.Body = dap.VariablesResponseBody{
Variables: []dap.Variable{{Name: "i", Value: "18434528", EvaluateName: "i", VariablesReference: 0}},
}
ds.send(response)
}
}
func (ds *fakeDebugSession) onSetVariableRequest(request *dap.SetVariableRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "setVariableRequest is not yet supported"))
}
func (ds *fakeDebugSession) onSetExpressionRequest(request *dap.SetExpressionRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "SetExpressionRequest is not yet supported"))
}
func (ds *fakeDebugSession) onSourceRequest(request *dap.SourceRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "SourceRequest is not yet supported"))
}
func (ds *fakeDebugSession) onThreadsRequest(request *dap.ThreadsRequest) {
response := &dap.ThreadsResponse{}
response.Response = *newResponse(request.Seq, request.Command)
response.Body = dap.ThreadsResponseBody{Threads: []dap.Thread{{Id: 1, Name: "main"}}}
ds.send(response)
}
func (ds *fakeDebugSession) onTerminateThreadsRequest(request *dap.TerminateThreadsRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "TerminateRequest is not yet supported"))
}
func (ds *fakeDebugSession) onEvaluateRequest(request *dap.EvaluateRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "EvaluateRequest is not yet supported"))
}
func (ds *fakeDebugSession) onStepInTargetsRequest(request *dap.StepInTargetsRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "StepInTargetRequest is not yet supported"))
}
func (ds *fakeDebugSession) onGotoTargetsRequest(request *dap.GotoTargetsRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "GotoTargetRequest is not yet supported"))
}
func (ds *fakeDebugSession) onCompletionsRequest(request *dap.CompletionsRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "CompletionRequest is not yet supported"))
}
func (ds *fakeDebugSession) onExceptionInfoRequest(request *dap.ExceptionInfoRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "ExceptionRequest is not yet supported"))
}
func (ds *fakeDebugSession) onLoadedSourcesRequest(request *dap.LoadedSourcesRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "LoadedRequest is not yet supported"))
}
func (ds *fakeDebugSession) onDataBreakpointInfoRequest(request *dap.DataBreakpointInfoRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "DataBreakpointInfoRequest is not yet supported"))
}
func (ds *fakeDebugSession) onSetDataBreakpointsRequest(request *dap.SetDataBreakpointsRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "SetDataBreakpointsRequest is not yet supported"))
}
func (ds *fakeDebugSession) onReadMemoryRequest(request *dap.ReadMemoryRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "ReadMemoryRequest is not yet supported"))
}
func (ds *fakeDebugSession) onDisassembleRequest(request *dap.DisassembleRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "DisassembleRequest is not yet supported"))
}
func (ds *fakeDebugSession) onCancelRequest(request *dap.CancelRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "CancelRequest is not yet supported"))
}
func (ds *fakeDebugSession) onBreakpointLocationsRequest(request *dap.BreakpointLocationsRequest) {
ds.send(newErrorResponse(request.Seq, request.Command, "BreakpointLocationsRequest is not yet supported"))
}
func newEvent(event string) *dap.Event {
return &dap.Event{
ProtocolMessage: dap.ProtocolMessage{
Seq: 0,
Type: "event",
},
Event: event,
}
}
func newResponse(requestSeq int, command string) *dap.Response {
return &dap.Response{
ProtocolMessage: dap.ProtocolMessage{
Seq: 0,
Type: "response",
},
Command: command,
RequestSeq: requestSeq,
Success: true,
}
}
func newErrorResponse(requestSeq int, command string, message string) *dap.ErrorResponse {
er := &dap.ErrorResponse{}
er.Response = *newResponse(requestSeq, command)
er.Success = false
er.Message = "unsupported"
er.Body.Error.Format = message
er.Body.Error.Id = 12345
return er
}
@@ -0,0 +1,156 @@
// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"bufio"
"bytes"
"io/ioutil"
"log"
"net"
"sync"
"testing"
"time"
"github.com/google/go-dap"
)
var initializeRequest = []byte(`{"seq":1,"type":"request","command":"initialize","arguments":{"clientID":"vscode","clientName":"Visual Studio Code","adapterID":"go","pathFormat":"path","linesStartAt1":true,"columnsStartAt1":true,"supportsVariableType":true,"supportsVariablePaging":true,"supportsRunInTerminalRequest":true,"locale":"en-us"}}`)
var initializedEvent = []byte(`{"seq":0,"type":"event","event":"initialized"}`)
var initializeResponse = []byte(`{"seq":0,"type":"response","request_seq":1,"success":true,"command":"initialize","body":{"supportsConfigurationDoneRequest":true}}`)
var launchRequest = []byte(`{"seq":2,"type":"request","command":"launch","arguments":{"noDebug": true,"name":"Launch","type":"go","request":"launch","mode":"debug","program":"/Users/foo/go/src/hello","__sessionId":"4c88179f-1202-4f75-9e67-5bf535cde30a","args":["somearg"],"env":{"GOPATH":"/Users/foo/go","HOME":"/Users/foo","SHELL":"/bin/bash"}}}`)
var launchResponse = []byte(`{"seq":0,"type":"response","request_seq":2,"success":true,"command":"launch"}`)
var setBreakpointsRequest = []byte(`{"seq":3,"type":"request","command":"setBreakpoints","arguments":{"source":{"name":"hello.go","path":"/Users/foo/go/src/hello/hello.go"},"lines":[7],"breakpoints":[{"line":7}],"sourceModified":false}}`)
var setBreakpointsResponse = []byte(`{"seq":0,"type":"response","request_seq":3,"success":true,"command":"setBreakpoints","body":{"breakpoints":[{"verified":true,"line":7}]}}`)
var setExceptionBreakpointsRequest = []byte(`{"seq":4,"type":"request","command":"setExceptionBreakpoints","arguments":{"filters":[]}}`)
var setExceptionBreakpointsResponse = []byte(`{"seq":0,"type":"response","request_seq":4,"success":true,"command":"setExceptionBreakpoints","body":{}}`)
var configurationDoneRequest = []byte(`{"seq":5,"type":"request","command":"configurationDone"}`)
var threadEvent = []byte(`{"seq":0,"type":"event","event":"thread","body":{"reason":"started","threadId":1}}`)
var configurationDoneResponse = []byte(`{"seq":0,"type":"response","request_seq":5,"success":true,"command":"configurationDone"}`)
var stoppedEvent = []byte(`{"seq":0,"type":"event","event":"stopped","body":{"reason":"breakpoint","threadId":1,"allThreadsStopped":true}}`)
var threadsRequest = []byte(`{"seq":6,"type":"request","command":"threads"}`)
var threadsResponse = []byte(`{"seq":0,"type":"response","request_seq":6,"success":true,"command":"threads","body":{"threads":[{"id":1,"name":"main"}]}}`)
var stackTraceRequest = []byte(`{"seq":7,"type":"request","command":"stackTrace","arguments":{"threadId":1,"startFrame":0,"levels":20}}`)
var stackTraceResponse = []byte(`{"seq":0,"type":"response","request_seq":7,"success":true,"command":"stackTrace","body":{"stackFrames":[{"id":1000,"name":"main.main","source":{"name":"hello.go","path":"/Users/foo/go/src/hello/hello.go"},"line":5,"column":0}],"totalFrames":1}}`)
var scopesRequest = []byte(`{"seq":8,"type":"request","command":"scopes","arguments":{"frameId":1000}}`)
var scopesResponse = []byte(`{"seq":0,"type":"response","request_seq":8,"success":true,"command":"scopes","body":{"scopes":[{"name":"Local","variablesReference":1000,"expensive":false},{"name":"Global","variablesReference":1001,"expensive":true}]}}`)
var variablesRequest = []byte(`{"seq":9,"type":"request","command":"variables","arguments":{"variablesReference":1000}}`)
var variablesResponse = []byte(`{"seq":0,"type":"response","request_seq":9,"success":true,"command":"variables","body":{"variables":[{"name":"i","value":"18434528","evaluateName":"i","variablesReference":0}]}}`)
var continueRequest = []byte(`{"seq":10,"type":"request","command":"continue","arguments":{"threadId":1}}`)
var continueResponse = []byte(`{"seq":0,"type":"response","request_seq":10,"success":true,"command":"continue","body":{"allThreadsContinued":false}}`)
var terminatedEvent = []byte(`{"seq":0,"type":"event","event":"terminated","body":{}}`)
var disconnectRequest = []byte(`{"seq":11,"type":"request","command":"disconnect","arguments":{"restart":false}}`)
var disconnectResponse = []byte(`{"seq":0,"type":"response","request_seq":11,"success":true,"command":"disconnect"}`)
func expectMessage(t *testing.T, r *bufio.Reader, want []byte) {
got, err := dap.ReadBaseMessage(r)
if err != nil {
t.Error(err)
}
if !bytes.Equal(got, want) {
t.Errorf("\ngot %q\nwant %q", got, want)
}
}
func TestServer(t *testing.T) {
log.SetOutput(ioutil.Discard)
port := "54321"
go func() {
err := server(port)
if err != nil {
log.Fatal("Could not start server:", err)
}
}()
// Give server time to start listening before clients connect
time.Sleep(100 * time.Millisecond)
var wg sync.WaitGroup
wg.Add(2)
go client(t, port, &wg)
go client(t, port, &wg)
wg.Wait()
}
func client(t *testing.T, port string, wg *sync.WaitGroup) {
defer wg.Done()
conn, err := net.Dial("tcp", ":"+port)
if err != nil {
log.Fatal("Could not connect to server:", err)
}
defer func() {
t.Log("Closing connection to server at", conn.RemoteAddr())
conn.Close()
}()
t.Log("Connected to server at", conn.RemoteAddr())
r := bufio.NewReader(conn)
// Start up
dap.WriteBaseMessage(conn, initializeRequest)
expectMessage(t, r, initializedEvent)
expectMessage(t, r, initializeResponse)
dap.WriteBaseMessage(conn, launchRequest)
expectMessage(t, r, launchResponse)
dap.WriteBaseMessage(conn, setBreakpointsRequest)
expectMessage(t, r, setBreakpointsResponse)
dap.WriteBaseMessage(conn, setExceptionBreakpointsRequest)
expectMessage(t, r, setExceptionBreakpointsResponse)
dap.WriteBaseMessage(conn, configurationDoneRequest)
expectMessage(t, r, threadEvent)
expectMessage(t, r, configurationDoneResponse)
// Stop on preconfigured breakpoint & Continue
expectMessage(t, r, stoppedEvent)
dap.WriteBaseMessage(conn, threadsRequest)
expectMessage(t, r, threadsResponse)
dap.WriteBaseMessage(conn, stackTraceRequest)
expectMessage(t, r, stackTraceResponse)
dap.WriteBaseMessage(conn, scopesRequest)
expectMessage(t, r, scopesResponse)
// Processing of this request will be slow due to a fake delay.
// Send the next request right away and confirm that processing
// happens concurrently and the two responses are received
// out of order.
dap.WriteBaseMessage(conn, variablesRequest)
dap.WriteBaseMessage(conn, continueRequest)
expectMessage(t, r, continueResponse)
expectMessage(t, r, variablesResponse)
// Shut down
expectMessage(t, r, terminatedEvent)
dap.WriteBaseMessage(conn, disconnectRequest)
expectMessage(t, r, disconnectResponse)
}