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// Copyright 2019 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 lsp
import (
"context"
"encoding/json"
"fmt"
"go/build"
"log"
"os"
"path"
"path/filepath"
"sort"
"strings"
"sync"
"golang.org/x/tools/gopls/internal/bug"
"golang.org/x/tools/gopls/internal/lsp/debug"
"golang.org/x/tools/gopls/internal/lsp/protocol"
"golang.org/x/tools/gopls/internal/lsp/source"
"golang.org/x/tools/gopls/internal/span"
"golang.org/x/tools/internal/event"
"golang.org/x/tools/internal/jsonrpc2"
)
func (s *Server) initialize(ctx context.Context, params *protocol.ParamInitialize) (*protocol.InitializeResult, error) {
ctx, done := event.Start(ctx, "lsp.Server.initialize")
defer done()
s.stateMu.Lock()
if s.state >= serverInitializing {
defer s.stateMu.Unlock()
return nil, fmt.Errorf("%w: initialize called while server in %v state", jsonrpc2.ErrInvalidRequest, s.state)
}
s.state = serverInitializing
s.stateMu.Unlock()
// For uniqueness, use the gopls PID rather than params.ProcessID (the client
// pid). Some clients might start multiple gopls servers, though they
// probably shouldn't.
pid := os.Getpid()
s.tempDir = filepath.Join(os.TempDir(), fmt.Sprintf("gopls-%d.%s", pid, s.session.ID()))
err := os.Mkdir(s.tempDir, 0700)
if err != nil {
// MkdirTemp could fail due to permissions issues. This is a problem with
// the user's environment, but should not block gopls otherwise behaving.
// All usage of s.tempDir should be predicated on having a non-empty
// s.tempDir.
event.Error(ctx, "creating temp dir", err)
s.tempDir = ""
}
s.progress.SetSupportsWorkDoneProgress(params.Capabilities.Window.WorkDoneProgress)
options := s.session.Options()
defer func() { s.session.SetOptions(options) }()
if err := s.handleOptionResults(ctx, source.SetOptions(options, params.InitializationOptions)); err != nil {
return nil, err
}
options.ForClientCapabilities(params.ClientInfo, params.Capabilities)
if options.ShowBugReports {
// Report the next bug that occurs on the server.
bug.Handle(func(b bug.Bug) {
msg := &protocol.ShowMessageParams{
Type: protocol.Error,
Message: fmt.Sprintf("A bug occurred on the server: %s\nLocation:%s", b.Description, b.Key),
}
go func() {
if err := s.eventuallyShowMessage(context.Background(), msg); err != nil {
log.Printf("error showing bug: %v", err)
}
}()
})
}
folders := params.WorkspaceFolders
if len(folders) == 0 {
if params.RootURI != "" {
folders = []protocol.WorkspaceFolder{{
URI: string(params.RootURI),
Name: path.Base(params.RootURI.SpanURI().Filename()),
}}
}
}
for _, folder := range folders {
uri := span.URIFromURI(folder.URI)
if !uri.IsFile() {
continue
}
s.pendingFolders = append(s.pendingFolders, folder)
}
// gopls only supports URIs with a file:// scheme, so if we have no
// workspace folders with a supported scheme, fail to initialize.
if len(folders) > 0 && len(s.pendingFolders) == 0 {
return nil, fmt.Errorf("unsupported URI schemes: %v (gopls only supports file URIs)", folders)
}
var codeActionProvider interface{} = true
if ca := params.Capabilities.TextDocument.CodeAction; len(ca.CodeActionLiteralSupport.CodeActionKind.ValueSet) > 0 {
// If the client has specified CodeActionLiteralSupport,
// send the code actions we support.
//
// Using CodeActionOptions is only valid if codeActionLiteralSupport is set.
codeActionProvider = &protocol.CodeActionOptions{
CodeActionKinds: s.getSupportedCodeActions(),
}
}
var renameOpts interface{} = true
if r := params.Capabilities.TextDocument.Rename; r != nil && r.PrepareSupport {
renameOpts = protocol.RenameOptions{
PrepareProvider: r.PrepareSupport,
}
}
versionInfo := debug.VersionInfo()
// golang/go#45732: Warn users who've installed sergi/go-diff@v1.2.0, since
// it will corrupt the formatting of their files.
for _, dep := range versionInfo.Deps {
if dep.Path == "github.com/sergi/go-diff" && dep.Version == "v1.2.0" {
if err := s.eventuallyShowMessage(ctx, &protocol.ShowMessageParams{
Message: `It looks like you have a bad gopls installation.
Please reinstall gopls by running 'GO111MODULE=on go install golang.org/x/tools/gopls@latest'.
See https://github.com/golang/go/issues/45732 for more information.`,
Type: protocol.Error,
}); err != nil {
return nil, err
}
}
}
goplsVersion, err := json.Marshal(versionInfo)
if err != nil {
return nil, err
}
return &protocol.InitializeResult{
Capabilities: protocol.ServerCapabilities{
CallHierarchyProvider: &protocol.Or_ServerCapabilities_callHierarchyProvider{Value: true},
CodeActionProvider: codeActionProvider,
CodeLensProvider: &protocol.CodeLensOptions{}, // must be non-nil to enable the code lens capability
CompletionProvider: &protocol.CompletionOptions{
TriggerCharacters: []string{"."},
},
DefinitionProvider: &protocol.Or_ServerCapabilities_definitionProvider{Value: true},
TypeDefinitionProvider: &protocol.Or_ServerCapabilities_typeDefinitionProvider{Value: true},
ImplementationProvider: &protocol.Or_ServerCapabilities_implementationProvider{Value: true},
DocumentFormattingProvider: &protocol.Or_ServerCapabilities_documentFormattingProvider{Value: true},
DocumentSymbolProvider: &protocol.Or_ServerCapabilities_documentSymbolProvider{Value: true},
WorkspaceSymbolProvider: &protocol.Or_ServerCapabilities_workspaceSymbolProvider{Value: true},
ExecuteCommandProvider: &protocol.ExecuteCommandOptions{
Commands: nonNilSliceString(options.SupportedCommands),
},
FoldingRangeProvider: &protocol.Or_ServerCapabilities_foldingRangeProvider{Value: true},
HoverProvider: &protocol.Or_ServerCapabilities_hoverProvider{Value: true},
DocumentHighlightProvider: &protocol.Or_ServerCapabilities_documentHighlightProvider{Value: true},
DocumentLinkProvider: &protocol.DocumentLinkOptions{},
InlayHintProvider: protocol.InlayHintOptions{},
ReferencesProvider: &protocol.Or_ServerCapabilities_referencesProvider{Value: true},
RenameProvider: renameOpts,
SelectionRangeProvider: &protocol.Or_ServerCapabilities_selectionRangeProvider{Value: true},
SemanticTokensProvider: protocol.SemanticTokensOptions{
Range: &protocol.Or_SemanticTokensOptions_range{Value: true},
Full: &protocol.Or_SemanticTokensOptions_full{Value: true},
Legend: protocol.SemanticTokensLegend{
TokenTypes: nonNilSliceString(s.session.Options().SemanticTypes),
TokenModifiers: nonNilSliceString(s.session.Options().SemanticMods),
},
},
SignatureHelpProvider: &protocol.SignatureHelpOptions{
TriggerCharacters: []string{"(", ","},
},
TextDocumentSync: &protocol.TextDocumentSyncOptions{
Change: protocol.Incremental,
OpenClose: true,
Save: &protocol.SaveOptions{
IncludeText: false,
},
},
Workspace: &protocol.Workspace6Gn{
WorkspaceFolders: &protocol.WorkspaceFolders5Gn{
Supported: true,
ChangeNotifications: "workspace/didChangeWorkspaceFolders",
},
},
},
ServerInfo: &protocol.PServerInfoMsg_initialize{
Name: "gopls",
Version: string(goplsVersion),
},
}, nil
}
func (s *Server) initialized(ctx context.Context, params *protocol.InitializedParams) error {
ctx, done := event.Start(ctx, "lsp.Server.initialized")
defer done()
s.stateMu.Lock()
if s.state >= serverInitialized {
defer s.stateMu.Unlock()
return fmt.Errorf("%w: initialized called while server in %v state", jsonrpc2.ErrInvalidRequest, s.state)
}
s.state = serverInitialized
s.stateMu.Unlock()
for _, not := range s.notifications {
s.client.ShowMessage(ctx, not)
}
s.notifications = nil
options := s.session.Options()
defer func() { s.session.SetOptions(options) }()
if err := s.addFolders(ctx, s.pendingFolders); err != nil {
return err
}
s.pendingFolders = nil
s.checkViewGoVersions()
var registrations []protocol.Registration
if options.ConfigurationSupported && options.DynamicConfigurationSupported {
registrations = append(registrations, protocol.Registration{
ID: "workspace/didChangeConfiguration",
Method: "workspace/didChangeConfiguration",
})
}
if len(registrations) > 0 {
if err := s.client.RegisterCapability(ctx, &protocol.RegistrationParams{
Registrations: registrations,
}); err != nil {
return err
}
}
return nil
}
// GoVersionTable maps Go versions to the gopls version in which support will
// be deprecated, and the final gopls version supporting them without warnings.
// Keep this in sync with gopls/README.md.
//
// Must be sorted in ascending order of Go version.
//
// Mutable for testing.
var GoVersionTable = []GoVersionSupport{
{12, "", "v0.7.5"},
{15, "", "v0.9.5"},
{16, "v0.13.0", "v0.11.0"},
{17, "v0.13.0", "v0.11.0"},
}
// GoVersionSupport holds information about end-of-life Go version support.
type GoVersionSupport struct {
GoVersion int
DeprecatedVersion string // if unset, the version is already deprecated
InstallGoplsVersion string
}
// OldestSupportedGoVersion is the last X in Go 1.X that this version of gopls
// supports.
func OldestSupportedGoVersion() int {
return GoVersionTable[len(GoVersionTable)-1].GoVersion + 1
}
// versionMessage returns the warning/error message to display if the user has
// the given Go version, if any. The goVersion variable is the X in Go 1.X. If
// fromBuild is set, the Go version is the version used to build gopls.
// Otherwise, it is the go command version.
//
// If goVersion is invalid (< 0), it returns "", 0.
func versionMessage(goVersion int, fromBuild bool) (string, protocol.MessageType) {
if goVersion < 0 {
return "", 0
}
for _, v := range GoVersionTable {
if goVersion <= v.GoVersion {
var msgBuilder strings.Builder
mType := protocol.Error
if fromBuild {
fmt.Fprintf(&msgBuilder, "Gopls was built with Go version 1.%d", goVersion)
} else {
fmt.Fprintf(&msgBuilder, "Found Go version 1.%d", goVersion)
}
if v.DeprecatedVersion != "" {
// not deprecated yet, just a warning
fmt.Fprintf(&msgBuilder, ", which will be unsupported by gopls %s. ", v.DeprecatedVersion)
mType = protocol.Warning
} else {
fmt.Fprint(&msgBuilder, ", which is not supported by this version of gopls. ")
}
fmt.Fprintf(&msgBuilder, "Please upgrade to Go 1.%d or later and reinstall gopls. ", OldestSupportedGoVersion())
fmt.Fprintf(&msgBuilder, "If you can't upgrade and want this message to go away, please install gopls %s. ", v.InstallGoplsVersion)
fmt.Fprint(&msgBuilder, "See https://go.dev/s/gopls-support-policy for more details.")
return msgBuilder.String(), mType
}
}
return "", 0
}
// checkViewGoVersions checks whether any Go version used by a view is too old,
// raising a showMessage notification if so.
//
// It should be called after views change.
func (s *Server) checkViewGoVersions() {
oldestVersion, fromBuild := go1Point(), true
for _, view := range s.session.Views() {
viewVersion := view.GoVersion()
if oldestVersion == -1 || viewVersion < oldestVersion {
oldestVersion, fromBuild = viewVersion, false
}
}
if msg, mType := versionMessage(oldestVersion, fromBuild); msg != "" {
s.eventuallyShowMessage(context.Background(), &protocol.ShowMessageParams{
Type: mType,
Message: msg,
})
}
}
// go1Point returns the x in Go 1.x. If an error occurs extracting the go
// version, it returns -1.
//
// Copied from the testenv package.
func go1Point() int {
for i := len(build.Default.ReleaseTags) - 1; i >= 0; i-- {
var version int
if _, err := fmt.Sscanf(build.Default.ReleaseTags[i], "go1.%d", &version); err != nil {
continue
}
return version
}
return -1
}
func (s *Server) addFolders(ctx context.Context, folders []protocol.WorkspaceFolder) error {
originalViews := len(s.session.Views())
viewErrors := make(map[span.URI]error)
var ndiagnose sync.WaitGroup // number of unfinished diagnose calls
if s.session.Options().VerboseWorkDoneProgress {
work := s.progress.Start(ctx, DiagnosticWorkTitle(FromInitialWorkspaceLoad), "Calculating diagnostics for initial workspace load...", nil, nil)
defer func() {
go func() {
ndiagnose.Wait()
work.End(ctx, "Done.")
}()
}()
}
// Only one view gets to have a workspace.
var nsnapshots sync.WaitGroup // number of unfinished snapshot initializations
for _, folder := range folders {
uri := span.URIFromURI(folder.URI)
// Ignore non-file URIs.
if !uri.IsFile() {
continue
}
work := s.progress.Start(ctx, "Setting up workspace", "Loading packages...", nil, nil)
snapshot, release, err := s.addView(ctx, folder.Name, uri)
if err != nil {
if err == source.ErrViewExists {
continue
}
viewErrors[uri] = err
work.End(ctx, fmt.Sprintf("Error loading packages: %s", err))
continue
}
// Inv: release() must be called once.
// Initialize snapshot asynchronously.
initialized := make(chan struct{})
nsnapshots.Add(1)
go func() {
snapshot.AwaitInitialized(ctx)
work.End(ctx, "Finished loading packages.")
nsnapshots.Done()
close(initialized) // signal
}()
// Diagnose the newly created view asynchronously.
ndiagnose.Add(1)
go func() {
s.diagnoseSnapshot(snapshot, nil, false, 0)
<-initialized
release()
ndiagnose.Done()
}()
}
// Wait for snapshots to be initialized so that all files are known.
// (We don't need to wait for diagnosis to finish.)
nsnapshots.Wait()
// Register for file watching notifications, if they are supported.
if err := s.updateWatchedDirectories(ctx); err != nil {
event.Error(ctx, "failed to register for file watching notifications", err)
}
if len(viewErrors) > 0 {
errMsg := fmt.Sprintf("Error loading workspace folders (expected %v, got %v)\n", len(folders), len(s.session.Views())-originalViews)
for uri, err := range viewErrors {
errMsg += fmt.Sprintf("failed to load view for %s: %v\n", uri, err)
}
return s.client.ShowMessage(ctx, &protocol.ShowMessageParams{
Type: protocol.Error,
Message: errMsg,
})
}
return nil
}
// updateWatchedDirectories compares the current set of directories to watch
// with the previously registered set of directories. If the set of directories
// has changed, we unregister and re-register for file watching notifications.
// updatedSnapshots is the set of snapshots that have been updated.
func (s *Server) updateWatchedDirectories(ctx context.Context) error {
patterns := s.session.FileWatchingGlobPatterns(ctx)
s.watchedGlobPatternsMu.Lock()
defer s.watchedGlobPatternsMu.Unlock()
// Nothing to do if the set of workspace directories is unchanged.
if equalURISet(s.watchedGlobPatterns, patterns) {
return nil
}
// If the set of directories to watch has changed, register the updates and
// unregister the previously watched directories. This ordering avoids a
// period where no files are being watched. Still, if a user makes on-disk
// changes before these updates are complete, we may miss them for the new
// directories.
prevID := s.watchRegistrationCount - 1
if err := s.registerWatchedDirectoriesLocked(ctx, patterns); err != nil {
return err
}
if prevID >= 0 {
return s.client.UnregisterCapability(ctx, &protocol.UnregistrationParams{
Unregisterations: []protocol.Unregistration{{
ID: watchedFilesCapabilityID(prevID),
Method: "workspace/didChangeWatchedFiles",
}},
})
}
return nil
}
func watchedFilesCapabilityID(id int) string {
return fmt.Sprintf("workspace/didChangeWatchedFiles-%d", id)
}
func equalURISet(m1, m2 map[string]struct{}) bool {
if len(m1) != len(m2) {
return false
}
for k := range m1 {
_, ok := m2[k]
if !ok {
return false
}
}
return true
}
// registerWatchedDirectoriesLocked sends the workspace/didChangeWatchedFiles
// registrations to the client and updates s.watchedDirectories.
// The caller must not subsequently mutate patterns.
func (s *Server) registerWatchedDirectoriesLocked(ctx context.Context, patterns map[string]struct{}) error {
if !s.session.Options().DynamicWatchedFilesSupported {
return nil
}
s.watchedGlobPatterns = patterns
watchers := make([]protocol.FileSystemWatcher, 0, len(patterns)) // must be a slice
val := protocol.WatchChange | protocol.WatchDelete | protocol.WatchCreate
for pattern := range patterns {
watchers = append(watchers, protocol.FileSystemWatcher{
GlobPattern: pattern,
Kind: &val,
})
}
if err := s.client.RegisterCapability(ctx, &protocol.RegistrationParams{
Registrations: []protocol.Registration{{
ID: watchedFilesCapabilityID(s.watchRegistrationCount),
Method: "workspace/didChangeWatchedFiles",
RegisterOptions: protocol.DidChangeWatchedFilesRegistrationOptions{
Watchers: watchers,
},
}},
}); err != nil {
return err
}
s.watchRegistrationCount++
return nil
}
func (s *Server) fetchConfig(ctx context.Context, name string, folder span.URI, o *source.Options) error {
if !s.session.Options().ConfigurationSupported {
return nil
}
configs, err := s.client.Configuration(ctx, &protocol.ParamConfiguration{
Items: []protocol.ConfigurationItem{{
ScopeURI: string(folder),
Section: "gopls",
}},
},
)
if err != nil {
return fmt.Errorf("failed to get workspace configuration from client (%s): %v", folder, err)
}
for _, config := range configs {
if err := s.handleOptionResults(ctx, source.SetOptions(o, config)); err != nil {
return err
}
}
return nil
}
func (s *Server) eventuallyShowMessage(ctx context.Context, msg *protocol.ShowMessageParams) error {
s.stateMu.Lock()
defer s.stateMu.Unlock()
if s.state == serverInitialized {
return s.client.ShowMessage(ctx, msg)
}
s.notifications = append(s.notifications, msg)
return nil
}
func (s *Server) handleOptionResults(ctx context.Context, results source.OptionResults) error {
var warnings, errors []string
for _, result := range results {
switch result.Error.(type) {
case nil:
// nothing to do
case *source.SoftError:
warnings = append(warnings, result.Error.Error())
default:
errors = append(errors, result.Error.Error())
}
}
// Sort messages, but put errors first.
//
// Having stable content for the message allows clients to de-duplicate. This
// matters because we may send duplicate warnings for clients that support
// dynamic configuration: one for the initial settings, and then more for the
// individual view settings.
var msgs []string
msgType := protocol.Warning
if len(errors) > 0 {
msgType = protocol.Error
sort.Strings(errors)
msgs = append(msgs, errors...)
}
if len(warnings) > 0 {
sort.Strings(warnings)
msgs = append(msgs, warnings...)
}
if len(msgs) > 0 {
// Settings
combined := "Invalid settings: " + strings.Join(msgs, "; ")
params := &protocol.ShowMessageParams{
Type: msgType,
Message: combined,
}
return s.eventuallyShowMessage(ctx, params)
}
return nil
}
// beginFileRequest checks preconditions for a file-oriented request and routes
// it to a snapshot.
// We don't want to return errors for benign conditions like wrong file type,
// so callers should do if !ok { return err } rather than if err != nil.
// The returned cleanup function is non-nil even in case of false/error result.
func (s *Server) beginFileRequest(ctx context.Context, pURI protocol.DocumentURI, expectKind source.FileKind) (source.Snapshot, source.FileHandle, bool, func(), error) {
uri := pURI.SpanURI()
if !uri.IsFile() {
// Not a file URI. Stop processing the request, but don't return an error.
return nil, nil, false, func() {}, nil
}
view, err := s.session.ViewOf(uri)
if err != nil {
return nil, nil, false, func() {}, err
}
snapshot, release, err := view.Snapshot()
if err != nil {
return nil, nil, false, func() {}, err
}
fh, err := snapshot.ReadFile(ctx, uri)
if err != nil {
release()
return nil, nil, false, func() {}, err
}
if expectKind != source.UnknownKind && view.FileKind(fh) != expectKind {
// Wrong kind of file. Nothing to do.
release()
return nil, nil, false, func() {}, nil
}
return snapshot, fh, true, release, nil
}
// shutdown implements the 'shutdown' LSP handler. It releases resources
// associated with the server and waits for all ongoing work to complete.
func (s *Server) shutdown(ctx context.Context) error {
ctx, done := event.Start(ctx, "lsp.Server.shutdown")
defer done()
s.stateMu.Lock()
defer s.stateMu.Unlock()
if s.state < serverInitialized {
event.Log(ctx, "server shutdown without initialization")
}
if s.state != serverShutDown {
// drop all the active views
s.session.Shutdown(ctx)
s.state = serverShutDown
if s.tempDir != "" {
if err := os.RemoveAll(s.tempDir); err != nil {
event.Error(ctx, "removing temp dir", err)
}
}
}
return nil
}
func (s *Server) exit(ctx context.Context) error {
ctx, done := event.Start(ctx, "lsp.Server.exit")
defer done()
s.stateMu.Lock()
defer s.stateMu.Unlock()
s.client.Close()
if s.state != serverShutDown {
// TODO: We should be able to do better than this.
os.Exit(1)
}
// We don't terminate the process on a normal exit, we just allow it to
// close naturally if needed after the connection is closed.
return nil
}
// TODO: when we can assume go1.18, replace with generic
// (after retiring support for go1.17)
func nonNilSliceString(x []string) []string {
if x == nil {
return []string{}
}
return x
}
func nonNilSliceTextEdit(x []protocol.TextEdit) []protocol.TextEdit {
if x == nil {
return []protocol.TextEdit{}
}
return x
}
func nonNilSliceCompletionItemTag(x []protocol.CompletionItemTag) []protocol.CompletionItemTag {
if x == nil {
return []protocol.CompletionItemTag{}
}
return x
}
func emptySliceDiagnosticTag(x []protocol.DiagnosticTag) []protocol.DiagnosticTag {
if x == nil {
return []protocol.DiagnosticTag{}
}
return x
}