mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-20 19:43:27 +02:00
* change to new code location * vendor * tagged version v0.2.0 * gitea-vet v0.2.1 Co-authored-by: techknowlogick <techknowlogick@gitea.io>
664 lines
18 KiB
Go
Vendored
664 lines
18 KiB
Go
Vendored
package imports
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"path"
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"path/filepath"
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"regexp"
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"sort"
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"strconv"
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"strings"
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"golang.org/x/mod/module"
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"golang.org/x/tools/internal/gocommand"
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"golang.org/x/tools/internal/gopathwalk"
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)
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// ModuleResolver implements resolver for modules using the go command as little
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// as feasible.
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type ModuleResolver struct {
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env *ProcessEnv
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moduleCacheDir string
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dummyVendorMod *gocommand.ModuleJSON // If vendoring is enabled, the pseudo-module that represents the /vendor directory.
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roots []gopathwalk.Root
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scanSema chan struct{} // scanSema prevents concurrent scans and guards scannedRoots.
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scannedRoots map[gopathwalk.Root]bool
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initialized bool
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main *gocommand.ModuleJSON
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modsByModPath []*gocommand.ModuleJSON // All modules, ordered by # of path components in module Path...
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modsByDir []*gocommand.ModuleJSON // ...or Dir.
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// moduleCacheCache stores information about the module cache.
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moduleCacheCache *dirInfoCache
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otherCache *dirInfoCache
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}
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func newModuleResolver(e *ProcessEnv) *ModuleResolver {
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r := &ModuleResolver{
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env: e,
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scanSema: make(chan struct{}, 1),
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}
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r.scanSema <- struct{}{}
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return r
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}
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func (r *ModuleResolver) init() error {
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if r.initialized {
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return nil
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}
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goenv, err := r.env.goEnv()
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if err != nil {
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return err
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}
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inv := gocommand.Invocation{
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BuildFlags: r.env.BuildFlags,
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Env: r.env.env(),
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Logf: r.env.Logf,
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WorkingDir: r.env.WorkingDir,
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}
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mainMod, vendorEnabled, err := gocommand.VendorEnabled(context.TODO(), inv, r.env.GocmdRunner)
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if err != nil {
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return err
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}
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if mainMod != nil && vendorEnabled {
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// Vendor mode is on, so all the non-Main modules are irrelevant,
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// and we need to search /vendor for everything.
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r.main = mainMod
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r.dummyVendorMod = &gocommand.ModuleJSON{
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Path: "",
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Dir: filepath.Join(mainMod.Dir, "vendor"),
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}
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r.modsByModPath = []*gocommand.ModuleJSON{mainMod, r.dummyVendorMod}
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r.modsByDir = []*gocommand.ModuleJSON{mainMod, r.dummyVendorMod}
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} else {
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// Vendor mode is off, so run go list -m ... to find everything.
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r.initAllMods()
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}
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if gmc := r.env.Env["GOMODCACHE"]; gmc != "" {
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r.moduleCacheDir = gmc
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} else {
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r.moduleCacheDir = filepath.Join(filepath.SplitList(goenv["GOPATH"])[0], "/pkg/mod")
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}
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sort.Slice(r.modsByModPath, func(i, j int) bool {
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count := func(x int) int {
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return strings.Count(r.modsByModPath[x].Path, "/")
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}
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return count(j) < count(i) // descending order
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})
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sort.Slice(r.modsByDir, func(i, j int) bool {
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count := func(x int) int {
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return strings.Count(r.modsByDir[x].Dir, "/")
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}
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return count(j) < count(i) // descending order
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})
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r.roots = []gopathwalk.Root{
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{filepath.Join(goenv["GOROOT"], "/src"), gopathwalk.RootGOROOT},
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}
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if r.main != nil {
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r.roots = append(r.roots, gopathwalk.Root{r.main.Dir, gopathwalk.RootCurrentModule})
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}
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if vendorEnabled {
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r.roots = append(r.roots, gopathwalk.Root{r.dummyVendorMod.Dir, gopathwalk.RootOther})
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} else {
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addDep := func(mod *gocommand.ModuleJSON) {
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if mod.Replace == nil {
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// This is redundant with the cache, but we'll skip it cheaply enough.
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r.roots = append(r.roots, gopathwalk.Root{mod.Dir, gopathwalk.RootModuleCache})
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} else {
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r.roots = append(r.roots, gopathwalk.Root{mod.Dir, gopathwalk.RootOther})
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}
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}
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// Walk dependent modules before scanning the full mod cache, direct deps first.
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for _, mod := range r.modsByModPath {
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if !mod.Indirect && !mod.Main {
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addDep(mod)
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}
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}
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for _, mod := range r.modsByModPath {
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if mod.Indirect && !mod.Main {
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addDep(mod)
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}
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}
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r.roots = append(r.roots, gopathwalk.Root{r.moduleCacheDir, gopathwalk.RootModuleCache})
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}
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r.scannedRoots = map[gopathwalk.Root]bool{}
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if r.moduleCacheCache == nil {
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r.moduleCacheCache = &dirInfoCache{
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dirs: map[string]*directoryPackageInfo{},
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listeners: map[*int]cacheListener{},
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}
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}
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if r.otherCache == nil {
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r.otherCache = &dirInfoCache{
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dirs: map[string]*directoryPackageInfo{},
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listeners: map[*int]cacheListener{},
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}
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}
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r.initialized = true
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return nil
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}
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func (r *ModuleResolver) initAllMods() error {
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stdout, err := r.env.invokeGo(context.TODO(), "list", "-m", "-json", "...")
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if err != nil {
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return err
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}
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for dec := json.NewDecoder(stdout); dec.More(); {
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mod := &gocommand.ModuleJSON{}
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if err := dec.Decode(mod); err != nil {
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return err
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}
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if mod.Dir == "" {
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if r.env.Logf != nil {
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r.env.Logf("module %v has not been downloaded and will be ignored", mod.Path)
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}
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// Can't do anything with a module that's not downloaded.
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continue
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}
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// golang/go#36193: the go command doesn't always clean paths.
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mod.Dir = filepath.Clean(mod.Dir)
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r.modsByModPath = append(r.modsByModPath, mod)
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r.modsByDir = append(r.modsByDir, mod)
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if mod.Main {
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r.main = mod
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}
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}
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return nil
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}
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func (r *ModuleResolver) ClearForNewScan() {
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<-r.scanSema
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r.scannedRoots = map[gopathwalk.Root]bool{}
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r.otherCache = &dirInfoCache{
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dirs: map[string]*directoryPackageInfo{},
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listeners: map[*int]cacheListener{},
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}
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r.scanSema <- struct{}{}
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}
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func (r *ModuleResolver) ClearForNewMod() {
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<-r.scanSema
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*r = ModuleResolver{
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env: r.env,
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moduleCacheCache: r.moduleCacheCache,
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otherCache: r.otherCache,
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scanSema: r.scanSema,
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}
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r.init()
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r.scanSema <- struct{}{}
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}
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// findPackage returns the module and directory that contains the package at
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// the given import path, or returns nil, "" if no module is in scope.
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func (r *ModuleResolver) findPackage(importPath string) (*gocommand.ModuleJSON, string) {
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// This can't find packages in the stdlib, but that's harmless for all
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// the existing code paths.
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for _, m := range r.modsByModPath {
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if !strings.HasPrefix(importPath, m.Path) {
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continue
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}
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pathInModule := importPath[len(m.Path):]
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pkgDir := filepath.Join(m.Dir, pathInModule)
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if r.dirIsNestedModule(pkgDir, m) {
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continue
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}
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if info, ok := r.cacheLoad(pkgDir); ok {
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if loaded, err := info.reachedStatus(nameLoaded); loaded {
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if err != nil {
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continue // No package in this dir.
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}
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return m, pkgDir
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}
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if scanned, err := info.reachedStatus(directoryScanned); scanned && err != nil {
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continue // Dir is unreadable, etc.
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}
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// This is slightly wrong: a directory doesn't have to have an
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// importable package to count as a package for package-to-module
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// resolution. package main or _test files should count but
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// don't.
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// TODO(heschi): fix this.
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if _, err := r.cachePackageName(info); err == nil {
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return m, pkgDir
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}
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}
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// Not cached. Read the filesystem.
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pkgFiles, err := ioutil.ReadDir(pkgDir)
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if err != nil {
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continue
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}
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// A module only contains a package if it has buildable go
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// files in that directory. If not, it could be provided by an
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// outer module. See #29736.
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for _, fi := range pkgFiles {
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if ok, _ := r.env.matchFile(pkgDir, fi.Name()); ok {
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return m, pkgDir
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}
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}
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}
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return nil, ""
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}
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func (r *ModuleResolver) cacheLoad(dir string) (directoryPackageInfo, bool) {
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if info, ok := r.moduleCacheCache.Load(dir); ok {
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return info, ok
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}
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return r.otherCache.Load(dir)
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}
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func (r *ModuleResolver) cacheStore(info directoryPackageInfo) {
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if info.rootType == gopathwalk.RootModuleCache {
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r.moduleCacheCache.Store(info.dir, info)
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} else {
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r.otherCache.Store(info.dir, info)
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}
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}
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func (r *ModuleResolver) cacheKeys() []string {
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return append(r.moduleCacheCache.Keys(), r.otherCache.Keys()...)
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}
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// cachePackageName caches the package name for a dir already in the cache.
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func (r *ModuleResolver) cachePackageName(info directoryPackageInfo) (string, error) {
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if info.rootType == gopathwalk.RootModuleCache {
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return r.moduleCacheCache.CachePackageName(info)
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}
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return r.otherCache.CachePackageName(info)
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}
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func (r *ModuleResolver) cacheExports(ctx context.Context, env *ProcessEnv, info directoryPackageInfo) (string, []string, error) {
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if info.rootType == gopathwalk.RootModuleCache {
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return r.moduleCacheCache.CacheExports(ctx, env, info)
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}
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return r.otherCache.CacheExports(ctx, env, info)
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}
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// findModuleByDir returns the module that contains dir, or nil if no such
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// module is in scope.
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func (r *ModuleResolver) findModuleByDir(dir string) *gocommand.ModuleJSON {
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// This is quite tricky and may not be correct. dir could be:
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// - a package in the main module.
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// - a replace target underneath the main module's directory.
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// - a nested module in the above.
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// - a replace target somewhere totally random.
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// - a nested module in the above.
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// - in the mod cache.
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// - in /vendor/ in -mod=vendor mode.
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// - nested module? Dunno.
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// Rumor has it that replace targets cannot contain other replace targets.
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for _, m := range r.modsByDir {
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if !strings.HasPrefix(dir, m.Dir) {
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continue
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}
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if r.dirIsNestedModule(dir, m) {
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continue
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}
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return m
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}
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return nil
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}
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// dirIsNestedModule reports if dir is contained in a nested module underneath
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// mod, not actually in mod.
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func (r *ModuleResolver) dirIsNestedModule(dir string, mod *gocommand.ModuleJSON) bool {
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if !strings.HasPrefix(dir, mod.Dir) {
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return false
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}
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if r.dirInModuleCache(dir) {
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// Nested modules in the module cache are pruned,
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// so it cannot be a nested module.
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return false
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}
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if mod != nil && mod == r.dummyVendorMod {
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// The /vendor pseudomodule is flattened and doesn't actually count.
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return false
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}
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modDir, _ := r.modInfo(dir)
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if modDir == "" {
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return false
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}
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return modDir != mod.Dir
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}
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func (r *ModuleResolver) modInfo(dir string) (modDir string, modName string) {
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readModName := func(modFile string) string {
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modBytes, err := ioutil.ReadFile(modFile)
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if err != nil {
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return ""
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}
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return modulePath(modBytes)
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}
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if r.dirInModuleCache(dir) {
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matches := modCacheRegexp.FindStringSubmatch(dir)
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index := strings.Index(dir, matches[1]+"@"+matches[2])
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modDir := filepath.Join(dir[:index], matches[1]+"@"+matches[2])
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return modDir, readModName(filepath.Join(modDir, "go.mod"))
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}
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for {
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if info, ok := r.cacheLoad(dir); ok {
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return info.moduleDir, info.moduleName
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}
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f := filepath.Join(dir, "go.mod")
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info, err := os.Stat(f)
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if err == nil && !info.IsDir() {
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return dir, readModName(f)
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}
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d := filepath.Dir(dir)
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if len(d) >= len(dir) {
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return "", "" // reached top of file system, no go.mod
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}
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dir = d
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}
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}
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func (r *ModuleResolver) dirInModuleCache(dir string) bool {
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if r.moduleCacheDir == "" {
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return false
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}
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return strings.HasPrefix(dir, r.moduleCacheDir)
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}
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func (r *ModuleResolver) loadPackageNames(importPaths []string, srcDir string) (map[string]string, error) {
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if err := r.init(); err != nil {
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return nil, err
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}
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names := map[string]string{}
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for _, path := range importPaths {
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_, packageDir := r.findPackage(path)
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if packageDir == "" {
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continue
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}
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name, err := packageDirToName(packageDir)
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if err != nil {
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continue
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}
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names[path] = name
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}
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return names, nil
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}
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func (r *ModuleResolver) scan(ctx context.Context, callback *scanCallback) error {
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if err := r.init(); err != nil {
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return err
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}
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processDir := func(info directoryPackageInfo) {
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// Skip this directory if we were not able to get the package information successfully.
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if scanned, err := info.reachedStatus(directoryScanned); !scanned || err != nil {
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return
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}
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pkg, err := r.canonicalize(info)
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if err != nil {
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return
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}
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|
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if !callback.dirFound(pkg) {
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return
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}
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pkg.packageName, err = r.cachePackageName(info)
|
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if err != nil {
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return
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}
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|
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if !callback.packageNameLoaded(pkg) {
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return
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}
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_, exports, err := r.loadExports(ctx, pkg, false)
|
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if err != nil {
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return
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}
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callback.exportsLoaded(pkg, exports)
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}
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|
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// Start processing everything in the cache, and listen for the new stuff
|
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// we discover in the walk below.
|
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stop1 := r.moduleCacheCache.ScanAndListen(ctx, processDir)
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defer stop1()
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stop2 := r.otherCache.ScanAndListen(ctx, processDir)
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defer stop2()
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|
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// We assume cached directories are fully cached, including all their
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// children, and have not changed. We can skip them.
|
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skip := func(root gopathwalk.Root, dir string) bool {
|
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info, ok := r.cacheLoad(dir)
|
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if !ok {
|
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return false
|
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}
|
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// This directory can be skipped as long as we have already scanned it.
|
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// Packages with errors will continue to have errors, so there is no need
|
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// to rescan them.
|
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packageScanned, _ := info.reachedStatus(directoryScanned)
|
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return packageScanned
|
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}
|
|
|
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// Add anything new to the cache, and process it if we're still listening.
|
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add := func(root gopathwalk.Root, dir string) {
|
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r.cacheStore(r.scanDirForPackage(root, dir))
|
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}
|
|
|
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// r.roots and the callback are not necessarily safe to use in the
|
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// goroutine below. Process them eagerly.
|
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roots := filterRoots(r.roots, callback.rootFound)
|
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// We can't cancel walks, because we need them to finish to have a usable
|
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// cache. Instead, run them in a separate goroutine and detach.
|
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scanDone := make(chan struct{})
|
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go func() {
|
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select {
|
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case <-ctx.Done():
|
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return
|
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case <-r.scanSema:
|
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}
|
|
defer func() { r.scanSema <- struct{}{} }()
|
|
// We have the lock on r.scannedRoots, and no other scans can run.
|
|
for _, root := range roots {
|
|
if ctx.Err() != nil {
|
|
return
|
|
}
|
|
|
|
if r.scannedRoots[root] {
|
|
continue
|
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}
|
|
gopathwalk.WalkSkip([]gopathwalk.Root{root}, add, skip, gopathwalk.Options{Logf: r.env.Logf, ModulesEnabled: true})
|
|
r.scannedRoots[root] = true
|
|
}
|
|
close(scanDone)
|
|
}()
|
|
select {
|
|
case <-ctx.Done():
|
|
case <-scanDone:
|
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}
|
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return nil
|
|
}
|
|
|
|
func (r *ModuleResolver) scoreImportPath(ctx context.Context, path string) int {
|
|
if _, ok := stdlib[path]; ok {
|
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return MaxRelevance
|
|
}
|
|
mod, _ := r.findPackage(path)
|
|
return modRelevance(mod)
|
|
}
|
|
|
|
func modRelevance(mod *gocommand.ModuleJSON) int {
|
|
switch {
|
|
case mod == nil: // out of scope
|
|
return MaxRelevance - 4
|
|
case mod.Indirect:
|
|
return MaxRelevance - 3
|
|
case !mod.Main:
|
|
return MaxRelevance - 2
|
|
default:
|
|
return MaxRelevance - 1 // main module ties with stdlib
|
|
}
|
|
}
|
|
|
|
// canonicalize gets the result of canonicalizing the packages using the results
|
|
// of initializing the resolver from 'go list -m'.
|
|
func (r *ModuleResolver) canonicalize(info directoryPackageInfo) (*pkg, error) {
|
|
// Packages in GOROOT are already canonical, regardless of the std/cmd modules.
|
|
if info.rootType == gopathwalk.RootGOROOT {
|
|
return &pkg{
|
|
importPathShort: info.nonCanonicalImportPath,
|
|
dir: info.dir,
|
|
packageName: path.Base(info.nonCanonicalImportPath),
|
|
relevance: MaxRelevance,
|
|
}, nil
|
|
}
|
|
|
|
importPath := info.nonCanonicalImportPath
|
|
mod := r.findModuleByDir(info.dir)
|
|
// Check if the directory is underneath a module that's in scope.
|
|
if mod != nil {
|
|
// It is. If dir is the target of a replace directive,
|
|
// our guessed import path is wrong. Use the real one.
|
|
if mod.Dir == info.dir {
|
|
importPath = mod.Path
|
|
} else {
|
|
dirInMod := info.dir[len(mod.Dir)+len("/"):]
|
|
importPath = path.Join(mod.Path, filepath.ToSlash(dirInMod))
|
|
}
|
|
} else if !strings.HasPrefix(importPath, info.moduleName) {
|
|
// The module's name doesn't match the package's import path. It
|
|
// probably needs a replace directive we don't have.
|
|
return nil, fmt.Errorf("package in %q is not valid without a replace statement", info.dir)
|
|
}
|
|
|
|
res := &pkg{
|
|
importPathShort: importPath,
|
|
dir: info.dir,
|
|
relevance: modRelevance(mod),
|
|
}
|
|
// We may have discovered a package that has a different version
|
|
// in scope already. Canonicalize to that one if possible.
|
|
if _, canonicalDir := r.findPackage(importPath); canonicalDir != "" {
|
|
res.dir = canonicalDir
|
|
}
|
|
return res, nil
|
|
}
|
|
|
|
func (r *ModuleResolver) loadExports(ctx context.Context, pkg *pkg, includeTest bool) (string, []string, error) {
|
|
if err := r.init(); err != nil {
|
|
return "", nil, err
|
|
}
|
|
if info, ok := r.cacheLoad(pkg.dir); ok && !includeTest {
|
|
return r.cacheExports(ctx, r.env, info)
|
|
}
|
|
return loadExportsFromFiles(ctx, r.env, pkg.dir, includeTest)
|
|
}
|
|
|
|
func (r *ModuleResolver) scanDirForPackage(root gopathwalk.Root, dir string) directoryPackageInfo {
|
|
subdir := ""
|
|
if dir != root.Path {
|
|
subdir = dir[len(root.Path)+len("/"):]
|
|
}
|
|
importPath := filepath.ToSlash(subdir)
|
|
if strings.HasPrefix(importPath, "vendor/") {
|
|
// Only enter vendor directories if they're explicitly requested as a root.
|
|
return directoryPackageInfo{
|
|
status: directoryScanned,
|
|
err: fmt.Errorf("unwanted vendor directory"),
|
|
}
|
|
}
|
|
switch root.Type {
|
|
case gopathwalk.RootCurrentModule:
|
|
importPath = path.Join(r.main.Path, filepath.ToSlash(subdir))
|
|
case gopathwalk.RootModuleCache:
|
|
matches := modCacheRegexp.FindStringSubmatch(subdir)
|
|
if len(matches) == 0 {
|
|
return directoryPackageInfo{
|
|
status: directoryScanned,
|
|
err: fmt.Errorf("invalid module cache path: %v", subdir),
|
|
}
|
|
}
|
|
modPath, err := module.UnescapePath(filepath.ToSlash(matches[1]))
|
|
if err != nil {
|
|
if r.env.Logf != nil {
|
|
r.env.Logf("decoding module cache path %q: %v", subdir, err)
|
|
}
|
|
return directoryPackageInfo{
|
|
status: directoryScanned,
|
|
err: fmt.Errorf("decoding module cache path %q: %v", subdir, err),
|
|
}
|
|
}
|
|
importPath = path.Join(modPath, filepath.ToSlash(matches[3]))
|
|
}
|
|
|
|
modDir, modName := r.modInfo(dir)
|
|
result := directoryPackageInfo{
|
|
status: directoryScanned,
|
|
dir: dir,
|
|
rootType: root.Type,
|
|
nonCanonicalImportPath: importPath,
|
|
moduleDir: modDir,
|
|
moduleName: modName,
|
|
}
|
|
if root.Type == gopathwalk.RootGOROOT {
|
|
// stdlib packages are always in scope, despite the confusing go.mod
|
|
return result
|
|
}
|
|
return result
|
|
}
|
|
|
|
// modCacheRegexp splits a path in a module cache into module, module version, and package.
|
|
var modCacheRegexp = regexp.MustCompile(`(.*)@([^/\\]*)(.*)`)
|
|
|
|
var (
|
|
slashSlash = []byte("//")
|
|
moduleStr = []byte("module")
|
|
)
|
|
|
|
// modulePath returns the module path from the gomod file text.
|
|
// If it cannot find a module path, it returns an empty string.
|
|
// It is tolerant of unrelated problems in the go.mod file.
|
|
//
|
|
// Copied from cmd/go/internal/modfile.
|
|
func modulePath(mod []byte) string {
|
|
for len(mod) > 0 {
|
|
line := mod
|
|
mod = nil
|
|
if i := bytes.IndexByte(line, '\n'); i >= 0 {
|
|
line, mod = line[:i], line[i+1:]
|
|
}
|
|
if i := bytes.Index(line, slashSlash); i >= 0 {
|
|
line = line[:i]
|
|
}
|
|
line = bytes.TrimSpace(line)
|
|
if !bytes.HasPrefix(line, moduleStr) {
|
|
continue
|
|
}
|
|
line = line[len(moduleStr):]
|
|
n := len(line)
|
|
line = bytes.TrimSpace(line)
|
|
if len(line) == n || len(line) == 0 {
|
|
continue
|
|
}
|
|
|
|
if line[0] == '"' || line[0] == '`' {
|
|
p, err := strconv.Unquote(string(line))
|
|
if err != nil {
|
|
return "" // malformed quoted string or multiline module path
|
|
}
|
|
return p
|
|
}
|
|
|
|
return string(line)
|
|
}
|
|
return "" // missing module path
|
|
}
|