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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 lsp
import (
"context"
"crypto/sha256"
"fmt"
"os"
"path/filepath"
"strings"
"sync"
"time"
"golang.org/x/tools/internal/event"
"golang.org/x/tools/internal/lsp/debug/log"
"golang.org/x/tools/internal/lsp/debug/tag"
"golang.org/x/tools/internal/lsp/mod"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/lsp/source"
"golang.org/x/tools/internal/lsp/template"
"golang.org/x/tools/internal/span"
"golang.org/x/tools/internal/xcontext"
errors "golang.org/x/xerrors"
)
// diagnosticSource differentiates different sources of diagnostics.
type diagnosticSource int
const (
modSource diagnosticSource = iota
gcDetailsSource
analysisSource
typeCheckSource
orphanedSource
)
// A diagnosticReport holds results for a single diagnostic source.
type diagnosticReport struct {
snapshotID uint64
publishedHash string
diags map[string]*source.Diagnostic
}
// fileReports holds a collection of diagnostic reports for a single file, as
// well as the hash of the last published set of diagnostics.
type fileReports struct {
snapshotID uint64
publishedHash string
reports map[diagnosticSource]diagnosticReport
}
func (d diagnosticSource) String() string {
switch d {
case modSource:
return "FromSource"
case gcDetailsSource:
return "FromGCDetails"
case analysisSource:
return "FromAnalysis"
case typeCheckSource:
return "FromTypeChecking"
case orphanedSource:
return "FromOrphans"
default:
return fmt.Sprintf("From?%d?", d)
}
}
// hashDiagnostics computes a hash to identify diags.
func hashDiagnostics(diags ...*source.Diagnostic) string {
source.SortDiagnostics(diags)
h := sha256.New()
for _, d := range diags {
for _, t := range d.Tags {
fmt.Fprintf(h, "%s", t)
}
for _, r := range d.Related {
fmt.Fprintf(h, "%s%s%s", r.URI, r.Message, r.Range)
}
fmt.Fprintf(h, "%s%s%s%s", d.Message, d.Range, d.Severity, d.Source)
}
return fmt.Sprintf("%x", h.Sum(nil))
}
func (s *Server) diagnoseDetached(snapshot source.Snapshot) {
ctx := snapshot.BackgroundContext()
ctx = xcontext.Detach(ctx)
s.diagnose(ctx, snapshot, false)
s.publishDiagnostics(ctx, true, snapshot)
}
func (s *Server) diagnoseSnapshots(snapshots map[source.Snapshot][]span.URI, onDisk bool) {
var diagnosticWG sync.WaitGroup
for snapshot, uris := range snapshots {
diagnosticWG.Add(1)
go func(snapshot source.Snapshot, uris []span.URI) {
defer diagnosticWG.Done()
s.diagnoseSnapshot(snapshot, uris, onDisk)
}(snapshot, uris)
}
diagnosticWG.Wait()
}
func (s *Server) diagnoseSnapshot(snapshot source.Snapshot, changedURIs []span.URI, onDisk bool) {
ctx := snapshot.BackgroundContext()
ctx, done := event.Start(ctx, "Server.diagnoseSnapshot", tag.Snapshot.Of(snapshot.ID()))
defer done()
delay := snapshot.View().Options().DiagnosticsDelay
if delay > 0 {
// 2-phase diagnostics.
//
// The first phase just parses and checks packages that have been
// affected by file modifications (no analysis).
//
// The second phase does everything, and is debounced by the configured
// delay.
s.diagnoseChangedFiles(ctx, snapshot, changedURIs, onDisk)
s.publishDiagnostics(ctx, false, snapshot)
if ok := <-s.diagDebouncer.debounce(snapshot.View().Name(), snapshot.ID(), time.After(delay)); ok {
s.diagnose(ctx, snapshot, false)
s.publishDiagnostics(ctx, true, snapshot)
}
return
}
// Ignore possible workspace configuration warnings in the normal flow.
s.diagnose(ctx, snapshot, false)
s.publishDiagnostics(ctx, true, snapshot)
}
func (s *Server) diagnoseChangedFiles(ctx context.Context, snapshot source.Snapshot, uris []span.URI, onDisk bool) {
ctx, done := event.Start(ctx, "Server.diagnoseChangedFiles", tag.Snapshot.Of(snapshot.ID()))
defer done()
packages := make(map[source.Package]struct{})
for _, uri := range uris {
// If the change is only on-disk and the file is not open, don't
// directly request its package. It may not be a workspace package.
if onDisk && !snapshot.IsOpen(uri) {
continue
}
// If the file is not known to the snapshot (e.g., if it was deleted),
// don't diagnose it.
if snapshot.FindFile(uri) == nil {
continue
}
// Don't call PackagesForFile for builtin.go, as it results in a
// command-line-arguments load.
if snapshot.IsBuiltin(ctx, uri) {
continue
}
pkgs, err := snapshot.PackagesForFile(ctx, uri, source.TypecheckFull, false)
if err != nil {
// TODO (findleyr): we should probably do something with the error here,
// but as of now this can fail repeatedly if load fails, so can be too
// noisy to log (and we'll handle things later in the slow pass).
continue
}
for _, pkg := range pkgs {
packages[pkg] = struct{}{}
}
}
var wg sync.WaitGroup
for pkg := range packages {
wg.Add(1)
go func(pkg source.Package) {
defer wg.Done()
s.diagnosePkg(ctx, snapshot, pkg, false)
}(pkg)
}
wg.Wait()
}
// diagnose is a helper function for running diagnostics with a given context.
// Do not call it directly. forceAnalysis is only true for testing purposes.
func (s *Server) diagnose(ctx context.Context, snapshot source.Snapshot, forceAnalysis bool) {
ctx, done := event.Start(ctx, "Server.diagnose", tag.Snapshot.Of(snapshot.ID()))
defer done()
// Wait for a free diagnostics slot.
select {
case <-ctx.Done():
return
case s.diagnosticsSema <- struct{}{}:
}
defer func() {
<-s.diagnosticsSema
}()
// First, diagnose the go.mod file.
modReports, modErr := mod.Diagnostics(ctx, snapshot)
if ctx.Err() != nil {
log.Trace.Log(ctx, "diagnose cancelled")
return
}
if modErr != nil {
event.Error(ctx, "warning: diagnose go.mod", modErr, tag.Directory.Of(snapshot.View().Folder().Filename()), tag.Snapshot.Of(snapshot.ID()))
}
for id, diags := range modReports {
if id.URI == "" {
event.Error(ctx, "missing URI for module diagnostics", fmt.Errorf("empty URI"), tag.Directory.Of(snapshot.View().Folder().Filename()))
continue
}
s.storeDiagnostics(snapshot, id.URI, modSource, diags)
}
// Diagnose all of the packages in the workspace.
wsPkgs, err := snapshot.ActivePackages(ctx)
if s.shouldIgnoreError(ctx, snapshot, err) {
return
}
criticalErr := snapshot.GetCriticalError(ctx)
// Show the error as a progress error report so that it appears in the
// status bar. If a client doesn't support progress reports, the error
// will still be shown as a ShowMessage. If there is no error, any running
// error progress reports will be closed.
s.showCriticalErrorStatus(ctx, snapshot, criticalErr)
// There may be .tmpl files.
for _, f := range snapshot.Templates() {
diags := template.Diagnose(f)
s.storeDiagnostics(snapshot, f.URI(), typeCheckSource, diags)
}
// If there are no workspace packages, there is nothing to diagnose and
// there are no orphaned files.
if len(wsPkgs) == 0 {
return
}
var (
wg sync.WaitGroup
seen = map[span.URI]struct{}{}
)
for _, pkg := range wsPkgs {
wg.Add(1)
for _, pgf := range pkg.CompiledGoFiles() {
seen[pgf.URI] = struct{}{}
}
go func(pkg source.Package) {
defer wg.Done()
s.diagnosePkg(ctx, snapshot, pkg, forceAnalysis)
}(pkg)
}
wg.Wait()
// Confirm that every opened file belongs to a package (if any exist in
// the workspace). Otherwise, add a diagnostic to the file.
for _, o := range s.session.Overlays() {
if _, ok := seen[o.URI()]; ok {
continue
}
diagnostic := s.checkForOrphanedFile(ctx, snapshot, o)
if diagnostic == nil {
continue
}
s.storeDiagnostics(snapshot, o.URI(), orphanedSource, []*source.Diagnostic{diagnostic})
}
}
func (s *Server) diagnosePkg(ctx context.Context, snapshot source.Snapshot, pkg source.Package, alwaysAnalyze bool) {
ctx, done := event.Start(ctx, "Server.diagnosePkg", tag.Snapshot.Of(snapshot.ID()), tag.Package.Of(pkg.ID()))
defer done()
enableDiagnostics := false
includeAnalysis := alwaysAnalyze // only run analyses for packages with open files
for _, pgf := range pkg.CompiledGoFiles() {
enableDiagnostics = enableDiagnostics || !snapshot.IgnoredFile(pgf.URI)
includeAnalysis = includeAnalysis || snapshot.IsOpen(pgf.URI)
}
// Don't show any diagnostics on ignored files.
if !enableDiagnostics {
return
}
pkgDiagnostics, err := snapshot.DiagnosePackage(ctx, pkg)
if err != nil {
event.Error(ctx, "warning: diagnosing package", err, tag.Snapshot.Of(snapshot.ID()), tag.Package.Of(pkg.ID()))
return
}
for _, cgf := range pkg.CompiledGoFiles() {
s.storeDiagnostics(snapshot, cgf.URI, typeCheckSource, pkgDiagnostics[cgf.URI])
}
if includeAnalysis && !pkg.HasListOrParseErrors() {
reports, err := source.Analyze(ctx, snapshot, pkg, false)
if err != nil {
event.Error(ctx, "warning: analyzing package", err, tag.Snapshot.Of(snapshot.ID()), tag.Package.Of(pkg.ID()))
return
}
for _, cgf := range pkg.CompiledGoFiles() {
s.storeDiagnostics(snapshot, cgf.URI, analysisSource, reports[cgf.URI])
}
}
// If gc optimization details are requested, add them to the
// diagnostic reports.
s.gcOptimizationDetailsMu.Lock()
_, enableGCDetails := s.gcOptimizationDetails[pkg.ID()]
s.gcOptimizationDetailsMu.Unlock()
if enableGCDetails {
gcReports, err := source.GCOptimizationDetails(ctx, snapshot, pkg)
if err != nil {
event.Error(ctx, "warning: gc details", err, tag.Snapshot.Of(snapshot.ID()), tag.Package.Of(pkg.ID()))
}
s.gcOptimizationDetailsMu.Lock()
_, enableGCDetails := s.gcOptimizationDetails[pkg.ID()]
// NOTE(golang/go#44826): hold the gcOptimizationDetails lock, and re-check
// whether gc optimization details are enabled, while storing gc_details
// results. This ensures that the toggling of GC details and clearing of
// diagnostics does not race with storing the results here.
if enableGCDetails {
for id, diags := range gcReports {
fh := snapshot.FindFile(id.URI)
// Don't publish gc details for unsaved buffers, since the underlying
// logic operates on the file on disk.
if fh == nil || !fh.Saved() {
continue
}
s.storeDiagnostics(snapshot, id.URI, gcDetailsSource, diags)
}
}
s.gcOptimizationDetailsMu.Unlock()
}
}
// storeDiagnostics stores results from a single diagnostic source. If merge is
// true, it merges results into any existing results for this snapshot.
func (s *Server) storeDiagnostics(snapshot source.Snapshot, uri span.URI, dsource diagnosticSource, diags []*source.Diagnostic) {
// Safeguard: ensure that the file actually exists in the snapshot
// (see golang.org/issues/38602).
fh := snapshot.FindFile(uri)
if fh == nil {
return
}
s.diagnosticsMu.Lock()
defer s.diagnosticsMu.Unlock()
if s.diagnostics[uri] == nil {
s.diagnostics[uri] = &fileReports{
publishedHash: hashDiagnostics(), // Hash for 0 diagnostics.
reports: map[diagnosticSource]diagnosticReport{},
}
}
report := s.diagnostics[uri].reports[dsource]
// Don't set obsolete diagnostics.
if report.snapshotID > snapshot.ID() {
return
}
if report.diags == nil || report.snapshotID != snapshot.ID() {
report.diags = map[string]*source.Diagnostic{}
}
report.snapshotID = snapshot.ID()
for _, d := range diags {
report.diags[hashDiagnostics(d)] = d
}
s.diagnostics[uri].reports[dsource] = report
}
// clearDiagnosticSource clears all diagnostics for a given source type. It is
// necessary for cases where diagnostics have been invalidated by something
// other than a snapshot change, for example when gc_details is toggled.
func (s *Server) clearDiagnosticSource(dsource diagnosticSource) {
s.diagnosticsMu.Lock()
defer s.diagnosticsMu.Unlock()
for _, reports := range s.diagnostics {
delete(reports.reports, dsource)
}
}
const WorkspaceLoadFailure = "Error loading workspace"
// showCriticalErrorStatus shows the error as a progress report.
// If the error is nil, it clears any existing error progress report.
func (s *Server) showCriticalErrorStatus(ctx context.Context, snapshot source.Snapshot, err *source.CriticalError) {
s.criticalErrorStatusMu.Lock()
defer s.criticalErrorStatusMu.Unlock()
// Remove all newlines so that the error message can be formatted in a
// status bar.
var errMsg string
if err != nil {
event.Error(ctx, "errors loading workspace", err.MainError, tag.Snapshot.Of(snapshot.ID()), tag.Directory.Of(snapshot.View().Folder()))
for _, d := range err.DiagList {
s.storeDiagnostics(snapshot, d.URI, modSource, []*source.Diagnostic{d})
}
errMsg = strings.ReplaceAll(err.MainError.Error(), "\n", " ")
}
if s.criticalErrorStatus == nil {
if errMsg != "" {
s.criticalErrorStatus = s.progress.Start(ctx, WorkspaceLoadFailure, errMsg, nil, nil)
}
return
}
// If an error is already shown to the user, update it or mark it as
// resolved.
if errMsg == "" {
s.criticalErrorStatus.End("Done.")
s.criticalErrorStatus = nil
} else {
s.criticalErrorStatus.Report(errMsg, 0)
}
}
// checkForOrphanedFile checks that the given URIs can be mapped to packages.
// If they cannot and the workspace is not otherwise unloaded, it also surfaces
// a warning, suggesting that the user check the file for build tags.
func (s *Server) checkForOrphanedFile(ctx context.Context, snapshot source.Snapshot, fh source.VersionedFileHandle) *source.Diagnostic {
if fh.Kind() != source.Go {
return nil
}
// builtin files won't have a package, but they are never orphaned.
if snapshot.IsBuiltin(ctx, fh.URI()) {
return nil
}
pkgs, err := snapshot.PackagesForFile(ctx, fh.URI(), source.TypecheckWorkspace, false)
if len(pkgs) > 0 || err == nil {
return nil
}
pgf, err := snapshot.ParseGo(ctx, fh, source.ParseHeader)
if err != nil {
return nil
}
spn, err := span.NewRange(snapshot.FileSet(), pgf.File.Name.Pos(), pgf.File.Name.End()).Span()
if err != nil {
return nil
}
rng, err := pgf.Mapper.Range(spn)
if err != nil {
return nil
}
// TODO(rstambler): We should be able to parse the build tags in the
// file and show a more specific error message. For now, put the diagnostic
// on the package declaration.
return &source.Diagnostic{
URI: fh.URI(),
Range: rng,
Severity: protocol.SeverityWarning,
Source: source.ListError,
Message: fmt.Sprintf(`No packages found for open file %s: %v.
If this file contains build tags, try adding "-tags=<build tag>" to your gopls "buildFlags" configuration (see (https://github.com/golang/tools/blob/master/gopls/doc/settings.md#buildflags-string).
Otherwise, see the troubleshooting guidelines for help investigating (https://github.com/golang/tools/blob/master/gopls/doc/troubleshooting.md).
`, fh.URI().Filename(), err),
}
}
// publishDiagnostics collects and publishes any unpublished diagnostic reports.
func (s *Server) publishDiagnostics(ctx context.Context, final bool, snapshot source.Snapshot) {
ctx, done := event.Start(ctx, "Server.publishDiagnostics", tag.Snapshot.Of(snapshot.ID()))
defer done()
s.diagnosticsMu.Lock()
defer s.diagnosticsMu.Unlock()
published := 0
defer func() {
log.Trace.Logf(ctx, "published %d diagnostics", published)
}()
for uri, r := range s.diagnostics {
// Snapshot IDs are always increasing, so we use them instead of file
// versions to create the correct order for diagnostics.
// If we've already delivered diagnostics for a future snapshot for this
// file, do not deliver them.
if r.snapshotID > snapshot.ID() {
continue
}
anyReportsChanged := false
reportHashes := map[diagnosticSource]string{}
var diags []*source.Diagnostic
for dsource, report := range r.reports {
if report.snapshotID != snapshot.ID() {
continue
}
var reportDiags []*source.Diagnostic
for _, d := range report.diags {
diags = append(diags, d)
reportDiags = append(reportDiags, d)
}
hash := hashDiagnostics(reportDiags...)
if hash != report.publishedHash {
anyReportsChanged = true
}
reportHashes[dsource] = hash
}
if !final && !anyReportsChanged {
// Don't invalidate existing reports on the client if we haven't got any
// new information.
continue
}
source.SortDiagnostics(diags)
hash := hashDiagnostics(diags...)
if hash == r.publishedHash {
// Update snapshotID to be the latest snapshot for which this diagnostic
// hash is valid.
r.snapshotID = snapshot.ID()
continue
}
var version int32
if fh := snapshot.FindFile(uri); fh != nil { // file may have been deleted
version = fh.Version()
}
if err := s.client.PublishDiagnostics(ctx, &protocol.PublishDiagnosticsParams{
Diagnostics: toProtocolDiagnostics(diags),
URI: protocol.URIFromSpanURI(uri),
Version: version,
}); err == nil {
published++
r.publishedHash = hash
r.snapshotID = snapshot.ID()
for dsource, hash := range reportHashes {
report := r.reports[dsource]
report.publishedHash = hash
r.reports[dsource] = report
}
} else {
if ctx.Err() != nil {
// Publish may have failed due to a cancelled context.
log.Trace.Log(ctx, "publish cancelled")
return
}
event.Error(ctx, "publishReports: failed to deliver diagnostic", err, tag.URI.Of(uri))
}
}
}
func toProtocolDiagnostics(diagnostics []*source.Diagnostic) []protocol.Diagnostic {
reports := []protocol.Diagnostic{}
for _, diag := range diagnostics {
related := make([]protocol.DiagnosticRelatedInformation, 0, len(diag.Related))
for _, rel := range diag.Related {
related = append(related, protocol.DiagnosticRelatedInformation{
Location: protocol.Location{
URI: protocol.URIFromSpanURI(rel.URI),
Range: rel.Range,
},
Message: rel.Message,
})
}
pdiag := protocol.Diagnostic{
// diag.Message might start with \n or \t
Message: strings.TrimSpace(diag.Message),
Range: diag.Range,
Severity: diag.Severity,
Source: string(diag.Source),
Tags: diag.Tags,
RelatedInformation: related,
}
if diag.Code != "" {
pdiag.Code = diag.Code
}
if diag.CodeHref != "" {
pdiag.CodeDescription = &protocol.CodeDescription{Href: diag.CodeHref}
}
reports = append(reports, pdiag)
}
return reports
}
func (s *Server) shouldIgnoreError(ctx context.Context, snapshot source.Snapshot, err error) bool {
if err == nil { // if there is no error at all
return false
}
if errors.Is(err, context.Canceled) {
return true
}
// If the folder has no Go code in it, we shouldn't spam the user with a warning.
var hasGo bool
_ = filepath.Walk(snapshot.View().Folder().Filename(), func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !strings.HasSuffix(info.Name(), ".go") {
return nil
}
hasGo = true
return errors.New("done")
})
return !hasGo
}
// Diagnostics formattedfor the debug server
// (all the relevant fields of Server are private)
// (The alternative is to export them)
func (s *Server) Diagnostics() map[string][]string {
ans := make(map[string][]string)
s.diagnosticsMu.Lock()
defer s.diagnosticsMu.Unlock()
for k, v := range s.diagnostics {
fn := k.Filename()
for typ, d := range v.reports {
if len(d.diags) == 0 {
continue
}
for _, dx := range d.diags {
ans[fn] = append(ans[fn], auxStr(dx, d, typ))
}
}
}
return ans
}
func auxStr(v *source.Diagnostic, d diagnosticReport, typ diagnosticSource) string {
// Tags? RelatedInformation?
msg := fmt.Sprintf("(%s)%q(source:%q,code:%q,severity:%s,snapshot:%d,type:%s)",
v.Range, v.Message, v.Source, v.Code, v.Severity, d.snapshotID, typ)
for _, r := range v.Related {
msg += fmt.Sprintf(" [%s:%s,%q]", r.URI.Filename(), r.Range, r.Message)
}
return msg
}