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// Copyright 2023 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 cache
import (
// A CriticalError is a workspace-wide error that generally prevents gopls from
// functioning correctly. In the presence of critical errors, other diagnostics
// in the workspace may not make sense.
type CriticalError struct {
// MainError is the primary error. Must be non-nil.
MainError error
// Diagnostics contains any supplemental (structured) diagnostics.
Diagnostics map[protocol.DocumentURI][]*Diagnostic
func byURI(d *Diagnostic) protocol.DocumentURI { return d.URI } // For use in maps.Group.
// An Diagnostic corresponds to an LSP Diagnostic.
type Diagnostic struct {
URI protocol.DocumentURI // of diagnosed file (not diagnostic documentation)
Range protocol.Range
Severity protocol.DiagnosticSeverity
Code string
CodeHref string
// Source is a human-readable description of the source of the error.
// Diagnostics generated by an analysis.Analyzer set it to Analyzer.Name.
Source DiagnosticSource
Message string
Tags []protocol.DiagnosticTag
Related []protocol.DiagnosticRelatedInformation
// Fields below are used internally to generate quick fixes. They aren't
// part of the LSP spec and historically didn't leave the server.
// Update(2023-05): version 3.16 of the LSP spec included support for the
// field, which holds arbitrary data preserved in the
// diagnostic for codeAction requests. This field allows bundling additional
// information for quick-fixes, and gopls can (and should) use this
// information to avoid re-evaluating diagnostics in code-action handlers.
// In order to stage this transition incrementally, the 'BundledFixes' field
// may store a 'bundled' (=json-serialized) form of the associated
// SuggestedFixes. Not all diagnostics have their fixes bundled.
BundledFixes *json.RawMessage
SuggestedFixes []SuggestedFix
func (d *Diagnostic) String() string {
return fmt.Sprintf("%v: %s", d.Range, d.Message)
type DiagnosticSource string
const (
UnknownError DiagnosticSource = "<Unknown source>"
ListError DiagnosticSource = "go list"
ParseError DiagnosticSource = "syntax"
TypeError DiagnosticSource = "compiler"
ModTidyError DiagnosticSource = "go mod tidy"
OptimizationDetailsError DiagnosticSource = "optimizer details"
UpgradeNotification DiagnosticSource = "upgrade available"
Vulncheck DiagnosticSource = "vulncheck imports"
Govulncheck DiagnosticSource = "govulncheck"
TemplateError DiagnosticSource = "template"
WorkFileError DiagnosticSource = " file"
ConsistencyInfo DiagnosticSource = "consistency"
type SuggestedFix struct {
Title string
Edits map[protocol.DocumentURI][]protocol.TextEdit
Command *protocol.Command
ActionKind protocol.CodeActionKind
// SuggestedFixFromCommand returns a suggested fix to run the given command.
func SuggestedFixFromCommand(cmd protocol.Command, kind protocol.CodeActionKind) SuggestedFix {
return SuggestedFix{
Title: cmd.Title,
Command: &cmd,
ActionKind: kind,
// quickFixesJSON is a JSON-serializable list of quick fixes
// to be saved in the protocol.Diagnostic.Data field.
type quickFixesJSON struct {
// TODO(rfindley): pack some sort of identifier here for later
// lookup/validation?
Fixes []protocol.CodeAction
// BundleQuickFixes attempts to bundle sd.SuggestedFixes into the
// sd.BundledFixes field, so that it can be round-tripped through the client.
// It returns false if the quick-fixes cannot be bundled.
func BundleQuickFixes(sd *Diagnostic) bool {
if len(sd.SuggestedFixes) == 0 {
return true
var actions []protocol.CodeAction
for _, fix := range sd.SuggestedFixes {
if fix.Edits != nil {
// For now, we only support bundled code actions that execute commands.
// In order to cleanly support bundled edits, we'd have to guarantee that
// the edits were generated on the current snapshot. But this naively
// implies that every fix would have to include a snapshot ID, which
// would require us to republish all diagnostics on each new snapshot.
// TODO(rfindley): in order to avoid this additional chatter, we'd need
// to build some sort of registry or other mechanism on the snapshot to
// check whether a diagnostic is still valid.
return false
action := protocol.CodeAction{
Title: fix.Title,
Kind: fix.ActionKind,
Command: fix.Command,
actions = append(actions, action)
fixes := quickFixesJSON{
Fixes: actions,
data, err := json.Marshal(fixes)
if err != nil {
bug.Reportf("marshalling quick fixes: %v", err)
return false
msg := json.RawMessage(data)
sd.BundledFixes = &msg
return true
// BundledQuickFixes extracts any bundled codeActions from the
// diag.Data field.
func BundledQuickFixes(diag protocol.Diagnostic) []protocol.CodeAction {
if diag.Data == nil {
return nil
var fix quickFixesJSON
if err := json.Unmarshal(*diag.Data, &fix); err != nil {
bug.Reportf("unmarshalling quick fix: %v", err)
return nil
var actions []protocol.CodeAction
for _, action := range fix.Fixes {
// See BundleQuickFixes: for now we only support bundling commands.
if action.Edit != nil {
bug.Reportf("bundled fix %q includes workspace edits", action.Title)
// associate the action with the incoming diagnostic
// (Note that this does not mutate the fix.Fixes slice).
action.Diagnostics = []protocol.Diagnostic{diag}
actions = append(actions, action)
return actions