// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main_test
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import (
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"archive/zip"
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"bytes"
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"encoding/json"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"net"
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"net/http"
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"os"
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"path/filepath"
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"strings"
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"sync"
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"testing"
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"cmd/go/internal/modfetch"
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"cmd/go/internal/modfetch/codehost"
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"cmd/go/internal/module"
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"cmd/go/internal/par"
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"cmd/go/internal/semver"
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"cmd/go/internal/txtar"
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)
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var (
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proxyAddr = flag.String("proxy", "", "run proxy on this network address instead of running any tests")
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proxyURL string
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)
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var proxyOnce sync.Once
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// StartProxy starts the Go module proxy running on *proxyAddr (like "localhost:1234")
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// and sets proxyURL to the GOPROXY setting to use to access the proxy.
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// Subsequent calls are no-ops.
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//
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// The proxy serves from testdata/mod. See testdata/mod/README.
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func StartProxy() {
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proxyOnce.Do(func() {
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fmt.Fprintf(os.Stderr, "go test proxy starting\n")
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readModList()
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addr := *proxyAddr
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if addr == "" {
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addr = "localhost:0"
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}
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l, err := net.Listen("tcp", addr)
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if err != nil {
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log.Fatal(err)
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}
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*proxyAddr = l.Addr().String()
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proxyURL = "http://" + *proxyAddr + "/mod"
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fmt.Fprintf(os.Stderr, "go test proxy running at GOPROXY=%s\n", proxyURL)
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go func() {
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log.Fatalf("go proxy: http.Serve: %v", http.Serve(l, http.HandlerFunc(proxyHandler)))
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}()
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})
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}
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var modList []module.Version
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func readModList() {
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infos, err := ioutil.ReadDir("testdata/mod")
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if err != nil {
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log.Fatal(err)
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}
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for _, info := range infos {
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name := info.Name()
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if !strings.HasSuffix(name, ".txt") {
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continue
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}
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name = strings.TrimSuffix(name, ".txt")
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i := strings.LastIndex(name, "_v")
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if i < 0 {
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continue
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}
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encPath := strings.ReplaceAll(name[:i], "_", "/")
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path, err := module.DecodePath(encPath)
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if err != nil {
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fmt.Fprintf(os.Stderr, "go proxy_test: %v\n", err)
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continue
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}
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encVers := name[i+1:]
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vers, err := module.DecodeVersion(encVers)
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if err != nil {
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fmt.Fprintf(os.Stderr, "go proxy_test: %v\n", err)
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continue
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}
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modList = append(modList, module.Version{Path: path, Version: vers})
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}
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}
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var zipCache par.Cache
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// proxyHandler serves the Go module proxy protocol.
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// See the proxy section of https://research.swtch.com/vgo-module.
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func proxyHandler(w http.ResponseWriter, r *http.Request) {
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if !strings.HasPrefix(r.URL.Path, "/mod/") {
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http.NotFound(w, r)
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return
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}
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path := strings.TrimPrefix(r.URL.Path, "/mod/")
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i := strings.Index(path, "/@v/")
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if i < 0 {
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http.NotFound(w, r)
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return
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}
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enc, file := path[:i], path[i+len("/@v/"):]
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path, err := module.DecodePath(enc)
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if err != nil {
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fmt.Fprintf(os.Stderr, "go proxy_test: %v\n", err)
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http.NotFound(w, r)
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return
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}
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if file == "list" {
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n := 0
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for _, m := range modList {
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if m.Path == path && !modfetch.IsPseudoVersion(m.Version) {
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if err := module.Check(m.Path, m.Version); err == nil {
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fmt.Fprintf(w, "%s\n", m.Version)
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n++
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}
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}
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}
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if n == 0 {
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http.NotFound(w, r)
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}
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return
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}
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i = strings.LastIndex(file, ".")
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if i < 0 {
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http.NotFound(w, r)
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return
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}
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encVers, ext := file[:i], file[i+1:]
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vers, err := module.DecodeVersion(encVers)
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if err != nil {
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fmt.Fprintf(os.Stderr, "go proxy_test: %v\n", err)
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http.NotFound(w, r)
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return
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}
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if codehost.AllHex(vers) {
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var best string
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// Convert commit hash (only) to known version.
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// Use latest version in semver priority, to match similar logic
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// in the repo-based module server (see modfetch.(*codeRepo).convert).
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for _, m := range modList {
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if m.Path == path && semver.Compare(best, m.Version) < 0 {
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var hash string
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if modfetch.IsPseudoVersion(m.Version) {
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hash = m.Version[strings.LastIndex(m.Version, "-")+1:]
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} else {
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hash = findHash(m)
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}
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if strings.HasPrefix(hash, vers) || strings.HasPrefix(vers, hash) {
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best = m.Version
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}
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}
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}
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if best != "" {
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vers = best
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}
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}
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a := readArchive(path, vers)
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if a == nil {
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fmt.Fprintf(os.Stderr, "go proxy: no archive %s %s\n", path, vers)
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http.Error(w, "cannot load archive", 500)
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return
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}
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switch ext {
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case "info", "mod":
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want := "." + ext
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for _, f := range a.Files {
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if f.Name == want {
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w.Write(f.Data)
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return
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}
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}
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case "zip":
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type cached struct {
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zip []byte
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err error
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}
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c := zipCache.Do(a, func() interface{} {
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var buf bytes.Buffer
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z := zip.NewWriter(&buf)
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for _, f := range a.Files {
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if strings.HasPrefix(f.Name, ".") {
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continue
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}
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var zipName string
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if strings.HasPrefix(f.Name, "/") {
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zipName = f.Name[1:]
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} else {
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zipName = path + "@" + vers + "/" + f.Name
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}
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zf, err := z.Create(zipName)
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if err != nil {
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return cached{nil, err}
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}
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if _, err := zf.Write(f.Data); err != nil {
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return cached{nil, err}
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}
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}
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if err := z.Close(); err != nil {
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return cached{nil, err}
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}
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return cached{buf.Bytes(), nil}
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}).(cached)
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if c.err != nil {
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fmt.Fprintf(os.Stderr, "go proxy: %v\n", c.err)
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http.Error(w, c.err.Error(), 500)
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return
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}
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w.Write(c.zip)
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return
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}
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http.NotFound(w, r)
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}
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func findHash(m module.Version) string {
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a := readArchive(m.Path, m.Version)
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if a == nil {
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return ""
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}
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var data []byte
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for _, f := range a.Files {
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if f.Name == ".info" {
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data = f.Data
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break
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}
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}
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var info struct{ Short string }
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json.Unmarshal(data, &info)
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return info.Short
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}
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var archiveCache par.Cache
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var cmdGoDir, _ = os.Getwd()
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func readArchive(path, vers string) *txtar.Archive {
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enc, err := module.EncodePath(path)
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if err != nil {
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fmt.Fprintf(os.Stderr, "go proxy: %v\n", err)
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return nil
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}
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encVers, err := module.EncodeVersion(vers)
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if err != nil {
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fmt.Fprintf(os.Stderr, "go proxy: %v\n", err)
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return nil
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}
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prefix := strings.ReplaceAll(enc, "/", "_")
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name := filepath.Join(cmdGoDir, "testdata/mod", prefix+"_"+encVers+".txt")
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a := archiveCache.Do(name, func() interface{} {
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a, err := txtar.ParseFile(name)
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if err != nil {
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if testing.Verbose() || !os.IsNotExist(err) {
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fmt.Fprintf(os.Stderr, "go proxy: %v\n", err)
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}
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a = nil
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}
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return a
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}).(*txtar.Archive)
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return a
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}
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