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2f43c6d1a2
go/internal/lsp/server.go
Ian Cottrell 2f43c6d1a2 internal/span: change to private fields 
Change span to hide its fields and have validating accessors
This catches the cases where either the offset or the position is being used
when it was not set.
It also normalizes the forms as the API now controls them, and allows us to
simplify some of the logic.
The converters are now allowed to return an error, which lets us cleanly
propagate bad cases.
The lsp was then converted to the new format, and also had some error checking
of its own added on the top.
All this allowed me to find and fix a few issues, most notably a case where the
wrong column mapper was being used during the conversion of definition results.

Change-Id: Iebdf8901e8269b28aaef60caf76574baa25c46d4
Reviewed-on: https://go-review.googlesource.com/c/tools/+/167858
Run-TryBot: Ian Cottrell <iancottrell@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
2019-03-15 18:05:47 +00:00

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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 (
"bytes"
"context"
"fmt"
"go/ast"
"go/parser"
"go/token"
"net"
"os"
"sync"
"golang.org/x/tools/go/packages"
"golang.org/x/tools/internal/jsonrpc2"
"golang.org/x/tools/internal/lsp/cache"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/lsp/source"
"golang.org/x/tools/internal/span"
)
// RunServer starts an LSP server on the supplied stream, and waits until the
// stream is closed.
func RunServer(ctx context.Context, stream jsonrpc2.Stream, opts ...interface{}) error {
s := &server{}
conn, client := protocol.RunServer(ctx, stream, s, opts...)
s.client = client
return conn.Wait(ctx)
}
// RunServerOnPort starts an LSP server on the given port and does not exit.
// This function exists for debugging purposes.
func RunServerOnPort(ctx context.Context, port int, opts ...interface{}) error {
return RunServerOnAddress(ctx, fmt.Sprintf(":%v", port))
}
// RunServerOnPort starts an LSP server on the given port and does not exit.
// This function exists for debugging purposes.
func RunServerOnAddress(ctx context.Context, addr string, opts ...interface{}) error {
s := &server{}
ln, err := net.Listen("tcp", addr)
if err != nil {
return err
}
for {
conn, err := ln.Accept()
if err != nil {
return err
}
stream := jsonrpc2.NewHeaderStream(conn, conn)
go func() {
conn, client := protocol.RunServer(ctx, stream, s, opts...)
s.client = client
conn.Wait(ctx)
}()
}
}
type server struct {
client protocol.Client
initializedMu sync.Mutex
initialized bool // set once the server has received "initialize" request
signatureHelpEnabled bool
snippetsSupported bool
textDocumentSyncKind protocol.TextDocumentSyncKind
viewMu sync.Mutex
view *cache.View
}
func (s *server) Initialize(ctx context.Context, params *protocol.InitializeParams) (*protocol.InitializeResult, error) {
s.initializedMu.Lock()
defer s.initializedMu.Unlock()
if s.initialized {
return nil, jsonrpc2.NewErrorf(jsonrpc2.CodeInvalidRequest, "server already initialized")
}
s.initialized = true // mark server as initialized now
// Check if the client supports snippets in completion items.
capText := params.Capabilities.InnerClientCapabilities.TextDocument
if capText != nil && capText.Completion != nil && capText.Completion.CompletionItem != nil {
s.snippetsSupported = capText.Completion.CompletionItem.SnippetSupport
}
s.signatureHelpEnabled = true
var rootURI span.URI
if params.RootURI != "" {
rootURI = span.URI(params.RootURI)
}
rootPath, err := rootURI.Filename()
if err != nil {
return nil, err
}
// TODO(rstambler): Change this default to protocol.Incremental (or add a
// flag). Disabled for now to simplify debugging.
s.textDocumentSyncKind = protocol.Full
s.view = cache.NewView(&packages.Config{
Context: ctx,
Dir: rootPath,
Mode: packages.LoadImports,
Fset: token.NewFileSet(),
Overlay: make(map[string][]byte),
ParseFile: func(fset *token.FileSet, filename string, src []byte) (*ast.File, error) {
return parser.ParseFile(fset, filename, src, parser.AllErrors|parser.ParseComments)
},
Tests: true,
})
return &protocol.InitializeResult{
Capabilities: protocol.ServerCapabilities{
InnerServerCapabilities: protocol.InnerServerCapabilities{
CodeActionProvider: true,
CompletionProvider: &protocol.CompletionOptions{
TriggerCharacters: []string{"."},
},
DefinitionProvider: true,
DocumentFormattingProvider: true,
DocumentRangeFormattingProvider: true,
HoverProvider: true,
SignatureHelpProvider: &protocol.SignatureHelpOptions{
TriggerCharacters: []string{"(", ","},
},
TextDocumentSync: &protocol.TextDocumentSyncOptions{
Change: s.textDocumentSyncKind,
OpenClose: true,
},
},
TypeDefinitionServerCapabilities: protocol.TypeDefinitionServerCapabilities{
TypeDefinitionProvider: true,
},
},
}, nil
}
func (s *server) Initialized(context.Context, *protocol.InitializedParams) error {
return nil // ignore
}
func (s *server) Shutdown(context.Context) error {
s.initializedMu.Lock()
defer s.initializedMu.Unlock()
if !s.initialized {
return jsonrpc2.NewErrorf(jsonrpc2.CodeInvalidRequest, "server not initialized")
}
s.initialized = false
return nil
}
func (s *server) Exit(ctx context.Context) error {
if s.initialized {
os.Exit(1)
}
os.Exit(0)
return nil
}
func (s *server) DidChangeWorkspaceFolders(context.Context, *protocol.DidChangeWorkspaceFoldersParams) error {
return notImplemented("DidChangeWorkspaceFolders")
}
func (s *server) DidChangeConfiguration(context.Context, *protocol.DidChangeConfigurationParams) error {
return notImplemented("DidChangeConfiguration")
}
func (s *server) DidChangeWatchedFiles(context.Context, *protocol.DidChangeWatchedFilesParams) error {
return notImplemented("DidChangeWatchedFiles")
}
func (s *server) Symbols(context.Context, *protocol.WorkspaceSymbolParams) ([]protocol.SymbolInformation, error) {
return nil, notImplemented("Symbols")
}
func (s *server) ExecuteCommand(context.Context, *protocol.ExecuteCommandParams) (interface{}, error) {
return nil, notImplemented("ExecuteCommand")
}
func (s *server) DidOpen(ctx context.Context, params *protocol.DidOpenTextDocumentParams) error {
return s.cacheAndDiagnose(ctx, span.URI(params.TextDocument.URI), params.TextDocument.Text)
}
func (s *server) applyChanges(ctx context.Context, params *protocol.DidChangeTextDocumentParams) (string, error) {
if len(params.ContentChanges) == 1 && params.ContentChanges[0].Range == nil {
// If range is empty, we expect the full content of file, i.e. a single change with no range.
change := params.ContentChanges[0]
if change.RangeLength != 0 {
return "", jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "unexpected change range provided")
}
return change.Text, nil
}
file, m, err := newColumnMap(ctx, s.view, span.URI(params.TextDocument.URI))
if err != nil {
return "", jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "file not found")
}
content := file.GetContent(ctx)
for _, change := range params.ContentChanges {
spn, err := m.RangeSpan(*change.Range)
if err != nil {
return "", err
}
if !spn.HasOffset() {
return "", jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "invalid range for content change")
}
start, end := spn.Start().Offset(), spn.End().Offset()
if end <= start {
return "", jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "invalid range for content change")
}
var buf bytes.Buffer
buf.Write(content[:start])
buf.WriteString(change.Text)
buf.Write(content[end:])
content = buf.Bytes()
}
return string(content), nil
}
func (s *server) DidChange(ctx context.Context, params *protocol.DidChangeTextDocumentParams) error {
if len(params.ContentChanges) < 1 {
return jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "no content changes provided")
}
var text string
switch s.textDocumentSyncKind {
case protocol.Incremental:
var err error
text, err = s.applyChanges(ctx, params)
if err != nil {
return err
}
case protocol.Full:
// We expect the full content of file, i.e. a single change with no range.
change := params.ContentChanges[0]
if change.RangeLength != 0 {
return jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "unexpected change range provided")
}
text = change.Text
}
return s.cacheAndDiagnose(ctx, span.URI(params.TextDocument.URI), text)
}
func (s *server) WillSave(context.Context, *protocol.WillSaveTextDocumentParams) error {
return notImplemented("WillSave")
}
func (s *server) WillSaveWaitUntil(context.Context, *protocol.WillSaveTextDocumentParams) ([]protocol.TextEdit, error) {
return nil, notImplemented("WillSaveWaitUntil")
}
func (s *server) DidSave(context.Context, *protocol.DidSaveTextDocumentParams) error {
return nil // ignore
}
func (s *server) DidClose(ctx context.Context, params *protocol.DidCloseTextDocumentParams) error {
s.setContent(ctx, span.URI(params.TextDocument.URI), nil)
return nil
}
func (s *server) Completion(ctx context.Context, params *protocol.CompletionParams) (*protocol.CompletionList, error) {
f, m, err := newColumnMap(ctx, s.view, span.URI(params.TextDocument.URI))
if err != nil {
return nil, err
}
spn, err := m.PointSpan(params.Position)
if err != nil {
return nil, err
}
rng, err := spn.Range(m.Converter)
if err != nil {
return nil, err
}
items, prefix, err := source.Completion(ctx, f, rng.Start)
if err != nil {
return nil, err
}
return &protocol.CompletionList{
IsIncomplete: false,
Items: toProtocolCompletionItems(items, prefix, params.Position, s.snippetsSupported, s.signatureHelpEnabled),
}, nil
}
func (s *server) CompletionResolve(context.Context, *protocol.CompletionItem) (*protocol.CompletionItem, error) {
return nil, notImplemented("CompletionResolve")
}
func (s *server) Hover(ctx context.Context, params *protocol.TextDocumentPositionParams) (*protocol.Hover, error) {
f, m, err := newColumnMap(ctx, s.view, span.URI(params.TextDocument.URI))
if err != nil {
return nil, err
}
spn, err := m.PointSpan(params.Position)
if err != nil {
return nil, err
}
identRange, err := spn.Range(m.Converter)
if err != nil {
return nil, err
}
ident, err := source.Identifier(ctx, s.view, f, identRange.Start)
if err != nil {
return nil, err
}
content, err := ident.Hover(ctx, nil)
if err != nil {
return nil, err
}
markdown := "```go\n" + content + "\n```"
identSpan, err := ident.Range.Span()
if err != nil {
return nil, err
}
rng, err := m.Range(identSpan)
if err != nil {
return nil, err
}
return &protocol.Hover{
Contents: protocol.MarkupContent{
Kind: protocol.Markdown,
Value: markdown,
},
Range: &rng,
}, nil
}
func (s *server) SignatureHelp(ctx context.Context, params *protocol.TextDocumentPositionParams) (*protocol.SignatureHelp, error) {
f, m, err := newColumnMap(ctx, s.view, span.URI(params.TextDocument.URI))
if err != nil {
return nil, err
}
spn, err := m.PointSpan(params.Position)
if err != nil {
return nil, err
}
rng, err := spn.Range(m.Converter)
if err != nil {
return nil, err
}
info, err := source.SignatureHelp(ctx, f, rng.Start)
if err != nil {
return nil, err
}
return toProtocolSignatureHelp(info), nil
}
func (s *server) Definition(ctx context.Context, params *protocol.TextDocumentPositionParams) ([]protocol.Location, error) {
f, m, err := newColumnMap(ctx, s.view, span.URI(params.TextDocument.URI))
if err != nil {
return nil, err
}
spn, err := m.PointSpan(params.Position)
if err != nil {
return nil, err
}
rng, err := spn.Range(m.Converter)
if err != nil {
return nil, err
}
ident, err := source.Identifier(ctx, s.view, f, rng.Start)
if err != nil {
return nil, err
}
decSpan, err := ident.Declaration.Range.Span()
if err != nil {
return nil, err
}
_, decM, err := newColumnMap(ctx, s.view, decSpan.URI())
if err != nil {
return nil, err
}
loc, err := decM.Location(decSpan)
if err != nil {
return nil, err
}
return []protocol.Location{loc}, nil
}
func (s *server) TypeDefinition(ctx context.Context, params *protocol.TextDocumentPositionParams) ([]protocol.Location, error) {
f, m, err := newColumnMap(ctx, s.view, span.URI(params.TextDocument.URI))
if err != nil {
return nil, err
}
spn, err := m.PointSpan(params.Position)
if err != nil {
return nil, err
}
rng, err := spn.Range(m.Converter)
if err != nil {
return nil, err
}
ident, err := source.Identifier(ctx, s.view, f, rng.Start)
if err != nil {
return nil, err
}
identSpan, err := ident.Type.Range.Span()
if err != nil {
return nil, err
}
_, identM, err := newColumnMap(ctx, s.view, identSpan.URI())
if err != nil {
return nil, err
}
loc, err := identM.Location(identSpan)
if err != nil {
return nil, err
}
return []protocol.Location{loc}, nil
}
func (s *server) Implementation(context.Context, *protocol.TextDocumentPositionParams) ([]protocol.Location, error) {
return nil, notImplemented("Implementation")
}
func (s *server) References(context.Context, *protocol.ReferenceParams) ([]protocol.Location, error) {
return nil, notImplemented("References")
}
func (s *server) DocumentHighlight(context.Context, *protocol.TextDocumentPositionParams) ([]protocol.DocumentHighlight, error) {
return nil, notImplemented("DocumentHighlight")
}
func (s *server) DocumentSymbol(context.Context, *protocol.DocumentSymbolParams) ([]protocol.DocumentSymbol, error) {
return nil, notImplemented("DocumentSymbol")
}
func (s *server) CodeAction(ctx context.Context, params *protocol.CodeActionParams) ([]protocol.CodeAction, error) {
_, m, err := newColumnMap(ctx, s.view, span.URI(params.TextDocument.URI))
if err != nil {
return nil, err
}
spn, err := m.RangeSpan(params.Range)
if err != nil {
return nil, err
}
edits, err := organizeImports(ctx, s.view, spn)
if err != nil {
return nil, err
}
return []protocol.CodeAction{
{
Title: "Organize Imports",
Kind: protocol.SourceOrganizeImports,
Edit: &protocol.WorkspaceEdit{
Changes: &map[string][]protocol.TextEdit{
params.TextDocument.URI: edits,
},
},
},
}, nil
}
func (s *server) CodeLens(context.Context, *protocol.CodeLensParams) ([]protocol.CodeLens, error) {
return nil, nil // ignore
}
func (s *server) CodeLensResolve(context.Context, *protocol.CodeLens) (*protocol.CodeLens, error) {
return nil, notImplemented("CodeLensResolve")
}
func (s *server) DocumentLink(context.Context, *protocol.DocumentLinkParams) ([]protocol.DocumentLink, error) {
return nil, nil // ignore
}
func (s *server) DocumentLinkResolve(context.Context, *protocol.DocumentLink) (*protocol.DocumentLink, error) {
return nil, notImplemented("DocumentLinkResolve")
}
func (s *server) DocumentColor(context.Context, *protocol.DocumentColorParams) ([]protocol.ColorInformation, error) {
return nil, notImplemented("DocumentColor")
}
func (s *server) ColorPresentation(context.Context, *protocol.ColorPresentationParams) ([]protocol.ColorPresentation, error) {
return nil, notImplemented("ColorPresentation")
}
func (s *server) Formatting(ctx context.Context, params *protocol.DocumentFormattingParams) ([]protocol.TextEdit, error) {
spn := span.New(span.URI(params.TextDocument.URI), span.Point{}, span.Point{})
return formatRange(ctx, s.view, spn)
}
func (s *server) RangeFormatting(ctx context.Context, params *protocol.DocumentRangeFormattingParams) ([]protocol.TextEdit, error) {
_, m, err := newColumnMap(ctx, s.view, span.URI(params.TextDocument.URI))
if err != nil {
return nil, err
}
spn, err := m.RangeSpan(params.Range)
if err != nil {
return nil, err
}
return formatRange(ctx, s.view, spn)
}
func (s *server) OnTypeFormatting(context.Context, *protocol.DocumentOnTypeFormattingParams) ([]protocol.TextEdit, error) {
return nil, notImplemented("OnTypeFormatting")
}
func (s *server) Rename(context.Context, *protocol.RenameParams) ([]protocol.WorkspaceEdit, error) {
return nil, notImplemented("Rename")
}
func (s *server) FoldingRanges(context.Context, *protocol.FoldingRangeParams) ([]protocol.FoldingRange, error) {
return nil, notImplemented("FoldingRanges")
}
func notImplemented(method string) *jsonrpc2.Error {
return jsonrpc2.NewErrorf(jsonrpc2.CodeMethodNotFound, "method %q not yet implemented", method)
}
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