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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 cache
import (
"context"
"fmt"
"go/types"
"io/ioutil"
"os"
"path/filepath"
"sort"
"strings"
"time"
"golang.org/x/tools/go/packages"
"golang.org/x/tools/internal/event"
"golang.org/x/tools/internal/gocommand"
"golang.org/x/tools/internal/lsp/debug/tag"
"golang.org/x/tools/internal/lsp/source"
"golang.org/x/tools/internal/memoize"
"golang.org/x/tools/internal/packagesinternal"
"golang.org/x/tools/internal/span"
errors "golang.org/x/xerrors"
)
// metadata holds package metadata extracted from a call to packages.Load.
type metadata struct {
id packageID
pkgPath packagePath
name packageName
goFiles []span.URI
compiledGoFiles []span.URI
forTest packagePath
typesSizes types.Sizes
errors []packages.Error
deps []packageID
missingDeps map[packagePath]struct{}
module *packages.Module
// config is the *packages.Config associated with the loaded package.
config *packages.Config
}
// load calls packages.Load for the given scopes, updating package metadata,
// import graph, and mapped files with the result.
func (s *snapshot) load(ctx context.Context, scopes ...interface{}) error {
var query []string
var containsDir bool // for logging
for _, scope := range scopes {
switch scope := scope.(type) {
case packagePath:
if scope == "command-line-arguments" {
panic("attempted to load command-line-arguments")
}
// The only time we pass package paths is when we're doing a
// partial workspace load. In those cases, the paths came back from
// go list and should already be GOPATH-vendorized when appropriate.
query = append(query, string(scope))
case fileURI:
uri := span.URI(scope)
// Don't try to load a file that doesn't exist.
fh := s.FindFile(uri)
if fh == nil || fh.Kind() != source.Go {
continue
}
query = append(query, fmt.Sprintf("file=%s", uri.Filename()))
case moduleLoadScope:
query = append(query, fmt.Sprintf("%s/...", scope))
case viewLoadScope:
// If we are outside of GOPATH, a module, or some other known
// build system, don't load subdirectories.
if !s.ValidBuildConfiguration() {
query = append(query, "./")
} else {
query = append(query, "./...")
}
default:
panic(fmt.Sprintf("unknown scope type %T", scope))
}
switch scope.(type) {
case viewLoadScope, moduleLoadScope:
containsDir = true
}
}
if len(query) == 0 {
return nil
}
sort.Strings(query) // for determinism
ctx, done := event.Start(ctx, "cache.view.load", tag.Query.Of(query))
defer done()
_, inv, cleanup, err := s.goCommandInvocation(ctx, source.LoadWorkspace, &gocommand.Invocation{
WorkingDir: s.view.rootURI.Filename(),
})
if err != nil {
return err
}
// Set a last resort deadline on packages.Load since it calls the go
// command, which may hang indefinitely if it has a bug. golang/go#42132
// and golang/go#42255 have more context.
ctx, cancel := context.WithTimeout(ctx, 15*time.Minute)
defer cancel()
cfg := s.config(ctx, inv)
pkgs, err := packages.Load(cfg, query...)
cleanup()
// If the context was canceled, return early. Otherwise, we might be
// type-checking an incomplete result. Check the context directly,
// because go/packages adds extra information to the error.
if ctx.Err() != nil {
return ctx.Err()
}
if err != nil {
event.Error(ctx, "go/packages.Load", err, tag.Snapshot.Of(s.ID()), tag.Directory.Of(cfg.Dir), tag.Query.Of(query), tag.PackageCount.Of(len(pkgs)))
} else {
event.Log(ctx, "go/packages.Load", tag.Snapshot.Of(s.ID()), tag.Directory.Of(cfg.Dir), tag.Query.Of(query), tag.PackageCount.Of(len(pkgs)))
}
if len(pkgs) == 0 {
if err != nil {
// Try to extract the error into a diagnostic.
if srcErrs := s.parseLoadError(ctx, err); srcErrs != nil {
return srcErrs
}
} else {
err = fmt.Errorf("no packages returned")
}
return errors.Errorf("%v: %w", err, source.PackagesLoadError)
}
for _, pkg := range pkgs {
if !containsDir || s.view.Options().VerboseOutput {
event.Log(ctx, "go/packages.Load", tag.Snapshot.Of(s.ID()), tag.PackagePath.Of(pkg.PkgPath), tag.Files.Of(pkg.CompiledGoFiles))
}
// Ignore packages with no sources, since we will never be able to
// correctly invalidate that metadata.
if len(pkg.GoFiles) == 0 && len(pkg.CompiledGoFiles) == 0 {
continue
}
// Special case for the builtin package, as it has no dependencies.
if pkg.PkgPath == "builtin" {
if err := s.buildBuiltinPackage(ctx, pkg.GoFiles); err != nil {
return err
}
continue
}
// Skip test main packages.
if isTestMain(pkg, s.view.gocache) {
continue
}
// Set the metadata for this package.
m, err := s.setMetadata(ctx, packagePath(pkg.PkgPath), pkg, cfg, map[packageID]struct{}{})
if err != nil {
return err
}
if _, err := s.buildPackageHandle(ctx, m.id, s.workspaceParseMode(m.id)); err != nil {
return err
}
}
// Rebuild the import graph when the metadata is updated.
s.clearAndRebuildImportGraph()
return nil
}
func (s *snapshot) parseLoadError(ctx context.Context, loadErr error) source.ErrorList {
var srcErrs source.ErrorList
for _, uri := range s.ModFiles() {
fh, err := s.GetFile(ctx, uri)
if err != nil {
continue
}
srcErr := extractGoCommandError(ctx, s, fh, loadErr)
if srcErr == nil {
continue
}
if srcErrs == nil {
srcErrs = source.ErrorList{}
}
srcErrs = append(srcErrs, srcErr)
}
return srcErrs
}
type workspaceDirKey string
type workspaceDirData struct {
dir string
err error
}
// getWorkspaceDir gets the URI for the workspace directory associated with
// this snapshot. The workspace directory is a temp directory containing the
// go.mod file computed from all active modules.
func (s *snapshot) getWorkspaceDir(ctx context.Context) (span.URI, error) {
s.mu.Lock()
h := s.workspaceDirHandle
s.mu.Unlock()
if h != nil {
return getWorkspaceDir(ctx, h, s.generation)
}
file, err := s.workspace.modFile(ctx, s)
if err != nil {
return "", err
}
content, err := file.Format()
if err != nil {
return "", err
}
key := workspaceDirKey(hashContents(content))
s.mu.Lock()
s.workspaceDirHandle = s.generation.Bind(key, func(context.Context, memoize.Arg) interface{} {
tmpdir, err := ioutil.TempDir("", "gopls-workspace-mod")
if err != nil {
return &workspaceDirData{err: err}
}
filename := filepath.Join(tmpdir, "go.mod")
if err := ioutil.WriteFile(filename, content, 0644); err != nil {
os.RemoveAll(tmpdir)
return &workspaceDirData{err: err}
}
return &workspaceDirData{dir: tmpdir}
}, func(v interface{}) {
d := v.(*workspaceDirData)
if d.dir != "" {
if err := os.RemoveAll(d.dir); err != nil {
event.Error(context.Background(), "cleaning workspace dir", err)
}
}
})
s.mu.Unlock()
return getWorkspaceDir(ctx, s.workspaceDirHandle, s.generation)
}
func getWorkspaceDir(ctx context.Context, h *memoize.Handle, g *memoize.Generation) (span.URI, error) {
v, err := h.Get(ctx, g, nil)
if err != nil {
return "", err
}
return span.URIFromPath(v.(*workspaceDirData).dir), nil
}
// setMetadata extracts metadata from pkg and records it in s. It
// recurses through pkg.Imports to ensure that metadata exists for all
// dependencies.
func (s *snapshot) setMetadata(ctx context.Context, pkgPath packagePath, pkg *packages.Package, cfg *packages.Config, seen map[packageID]struct{}) (*metadata, error) {
id := packageID(pkg.ID)
if _, ok := seen[id]; ok {
return nil, errors.Errorf("import cycle detected: %q", id)
}
// Recreate the metadata rather than reusing it to avoid locking.
m := &metadata{
id: id,
pkgPath: pkgPath,
name: packageName(pkg.Name),
forTest: packagePath(packagesinternal.GetForTest(pkg)),
typesSizes: pkg.TypesSizes,
errors: pkg.Errors,
config: cfg,
module: pkg.Module,
}
for _, filename := range pkg.CompiledGoFiles {
uri := span.URIFromPath(filename)
m.compiledGoFiles = append(m.compiledGoFiles, uri)
s.addID(uri, m.id)
}
for _, filename := range pkg.GoFiles {
uri := span.URIFromPath(filename)
m.goFiles = append(m.goFiles, uri)
s.addID(uri, m.id)
}
// TODO(rstambler): is this still necessary?
copied := map[packageID]struct{}{
id: {},
}
for k, v := range seen {
copied[k] = v
}
for importPath, importPkg := range pkg.Imports {
importPkgPath := packagePath(importPath)
importID := packageID(importPkg.ID)
m.deps = append(m.deps, importID)
// Don't remember any imports with significant errors.
if importPkgPath != "unsafe" && len(importPkg.CompiledGoFiles) == 0 {
if m.missingDeps == nil {
m.missingDeps = make(map[packagePath]struct{})
}
m.missingDeps[importPkgPath] = struct{}{}
continue
}
if s.getMetadata(importID) == nil {
if _, err := s.setMetadata(ctx, importPkgPath, importPkg, cfg, copied); err != nil {
event.Error(ctx, "error in dependency", err)
}
}
}
// Add the metadata to the cache.
s.mu.Lock()
defer s.mu.Unlock()
// TODO: We should make sure not to set duplicate metadata,
// and instead panic here. This can be done by making sure not to
// reset metadata information for packages we've already seen.
if original, ok := s.metadata[m.id]; ok {
m = original
} else {
s.metadata[m.id] = m
}
// Set the workspace packages. If any of the package's files belong to the
// view, then the package may be a workspace package.
for _, uri := range append(m.compiledGoFiles, m.goFiles...) {
if !s.view.contains(uri) {
continue
}
// The package's files are in this view. It may be a workspace package.
if strings.Contains(string(uri), "/vendor/") {
// Vendored packages are not likely to be interesting to the user.
continue
}
switch {
case m.forTest == "":
// A normal package.
s.workspacePackages[m.id] = pkgPath
case m.forTest == m.pkgPath, m.forTest+"_test" == m.pkgPath:
// The test variant of some workspace package or its x_test.
// To load it, we need to load the non-test variant with -test.
s.workspacePackages[m.id] = m.forTest
default:
// A test variant of some intermediate package. We don't care about it.
}
}
return m, nil
}
func isTestMain(pkg *packages.Package, gocache string) bool {
// Test mains must have an import path that ends with ".test".
if !strings.HasSuffix(pkg.PkgPath, ".test") {
return false
}
// Test main packages are always named "main".
if pkg.Name != "main" {
return false
}
// Test mains always have exactly one GoFile that is in the build cache.
if len(pkg.GoFiles) > 1 {
return false
}
if !strings.HasPrefix(pkg.GoFiles[0], gocache) {
return false
}
return true
}