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// Copyright 2024 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 modindex
import (
"fmt"
"log"
"os"
"path/filepath"
"regexp"
"strings"
"sync"
"time"
"golang.org/x/mod/semver"
"golang.org/x/tools/internal/gopathwalk"
)
type directory struct {
path string // relative to GOMODCACHE
importPath string
version string // semantic version
}
// bestDirByImportPath returns the best directory for each import
// path, where "best" means most recent semantic version. These import
// paths are inferred from the GOMODCACHE-relative dir names in dirs.
func bestDirByImportPath(dirs []string) (map[string]directory, error) {
dirsByPath := make(map[string]directory)
for _, dir := range dirs {
importPath, version, err := dirToImportPathVersion(dir)
if err != nil {
return nil, err
}
new := directory{
path: dir,
importPath: importPath,
version: version,
}
if old, ok := dirsByPath[importPath]; !ok || compareDirectory(new, old) < 0 {
dirsByPath[importPath] = new
}
}
return dirsByPath, nil
}
// compareDirectory defines an ordering of path@version directories,
// by descending version, then by ascending path.
func compareDirectory(x, y directory) int {
if sign := -semver.Compare(x.version, y.version); sign != 0 {
return sign // latest first
}
return strings.Compare(string(x.path), string(y.path))
}
// modCacheRegexp splits a relpathpath into module, module version, and package.
var modCacheRegexp = regexp.MustCompile(`(.*)@([^/\\]*)(.*)`)
// dirToImportPathVersion computes import path and semantic version
// from a GOMODCACHE-relative directory name.
func dirToImportPathVersion(dir string) (string, string, error) {
m := modCacheRegexp.FindStringSubmatch(string(dir))
// m[1] is the module path
// m[2] is the version major.minor.patch(-<pre release identifier)
// m[3] is the rest of the package path
if len(m) != 4 {
return "", "", fmt.Errorf("bad dir %s", dir)
}
if !semver.IsValid(m[2]) {
return "", "", fmt.Errorf("bad semantic version %s", m[2])
}
// ToSlash is required to convert Windows file paths
// into Go package import paths.
return filepath.ToSlash(m[1] + m[3]), m[2], nil
}
// findDirs returns an unordered list of relevant package directories,
// relative to the specified module cache root. The result includes only
// module dirs whose mtime is within (start, end).
func findDirs(root string, start, end time.Time) []string {
var (
resMu sync.Mutex
res []string
)
addDir := func(root gopathwalk.Root, dir string) {
// TODO(pjw): do we need to check times?
resMu.Lock()
defer resMu.Unlock()
res = append(res, relative(root.Path, dir))
}
skipDir := func(_ gopathwalk.Root, dir string) bool {
// The cache directory is already ignored in gopathwalk.
if filepath.Base(dir) == "internal" {
return true
}
// Skip toolchains.
if strings.Contains(dir, "toolchain@") {
return true
}
// Don't look inside @ directories that are too old/new.
if strings.Contains(filepath.Base(dir), "@") {
st, err := os.Stat(dir)
if err != nil {
log.Printf("can't stat dir %s %v", dir, err)
return true
}
mtime := st.ModTime()
return mtime.Before(start) || mtime.After(end)
}
return false
}
// TODO(adonovan): parallelize this. Even with a hot buffer cache,
// find $(go env GOMODCACHE) -type d
// can easily take up a minute.
roots := []gopathwalk.Root{{Path: root, Type: gopathwalk.RootModuleCache}}
gopathwalk.WalkSkip(roots, addDir, skipDir, gopathwalk.Options{
ModulesEnabled: true,
Concurrency: 1, // TODO(pjw): adjust concurrency
// Logf: log.Printf,
})
return res
}
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