423 lines
11 KiB
Go
423 lines
11 KiB
Go
package main
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import (
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"bytes"
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"flag"
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"fmt"
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"go/build"
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"go/parser"
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"go/token"
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"runtime"
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"strings"
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"testing"
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)
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// Set --regenerate to regenerate the golden files.
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var regenerate = flag.Bool("regenerate", false, "regenerate golden files")
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// When the environment variable RUN_AS_PROTOC_GEN_GO is set, we skip running
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// tests and instead act as protoc-gen-go. This allows the test binary to
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// pass itself to protoc.
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func init() {
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if os.Getenv("RUN_AS_PROTOC_GEN_GO") != "" {
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main()
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os.Exit(0)
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}
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}
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func TestGolden(t *testing.T) {
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workdir, err := ioutil.TempDir("", "proto-test")
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if err != nil {
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t.Fatal(err)
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}
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defer os.RemoveAll(workdir)
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// Find all the proto files we need to compile. We assume that each directory
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// contains the files for a single package.
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supportTypeAliases := hasReleaseTag("go1.9")
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packages := map[string][]string{}
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err = filepath.Walk("testdata", func(path string, info os.FileInfo, err error) error {
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if filepath.Base(path) == "import_public" && !supportTypeAliases {
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// Public imports require type alias support.
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return filepath.SkipDir
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}
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if !strings.HasSuffix(path, ".proto") {
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return nil
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}
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dir := filepath.Dir(path)
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packages[dir] = append(packages[dir], path)
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return nil
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})
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if err != nil {
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t.Fatal(err)
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}
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// Compile each package, using this binary as protoc-gen-go.
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for _, sources := range packages {
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args := []string{"-Itestdata", "--go_out=plugins=grpc,paths=source_relative:" + workdir}
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args = append(args, sources...)
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protoc(t, args)
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}
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// Compare each generated file to the golden version.
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filepath.Walk(workdir, func(genPath string, info os.FileInfo, _ error) error {
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if info.IsDir() {
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return nil
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}
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// For each generated file, figure out the path to the corresponding
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// golden file in the testdata directory.
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relPath, err := filepath.Rel(workdir, genPath)
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if err != nil {
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t.Errorf("filepath.Rel(%q, %q): %v", workdir, genPath, err)
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return nil
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}
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if filepath.SplitList(relPath)[0] == ".." {
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t.Errorf("generated file %q is not relative to %q", genPath, workdir)
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}
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goldenPath := filepath.Join("testdata", relPath)
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got, err := ioutil.ReadFile(genPath)
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if err != nil {
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t.Error(err)
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return nil
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}
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if *regenerate {
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// If --regenerate set, just rewrite the golden files.
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err := ioutil.WriteFile(goldenPath, got, 0666)
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if err != nil {
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t.Error(err)
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}
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return nil
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}
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want, err := ioutil.ReadFile(goldenPath)
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if err != nil {
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t.Error(err)
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return nil
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}
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want = fdescRE.ReplaceAll(want, nil)
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got = fdescRE.ReplaceAll(got, nil)
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if bytes.Equal(got, want) {
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return nil
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}
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cmd := exec.Command("diff", "-u", goldenPath, genPath)
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out, _ := cmd.CombinedOutput()
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t.Errorf("golden file differs: %v\n%v", relPath, string(out))
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return nil
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})
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}
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var fdescRE = regexp.MustCompile(`(?ms)^var fileDescriptor.*}`)
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// Source files used by TestParameters.
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const (
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aProto = `
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syntax = "proto3";
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package test.alpha;
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option go_package = "package/alpha";
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import "beta/b.proto";
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message M { test.beta.M field = 1; }`
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bProto = `
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syntax = "proto3";
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package test.beta;
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// no go_package option
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message M {}`
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)
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func TestParameters(t *testing.T) {
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for _, test := range []struct {
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parameters string
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wantFiles map[string]bool
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wantImportsA map[string]bool
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wantPackageA string
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wantPackageB string
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}{{
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parameters: "",
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wantFiles: map[string]bool{
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"package/alpha/a.pb.go": true,
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"beta/b.pb.go": true,
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},
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wantPackageA: "alpha",
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wantPackageB: "test_beta",
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wantImportsA: map[string]bool{
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"github.com/golang/protobuf/proto": true,
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"beta": true,
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},
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}, {
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parameters: "import_prefix=prefix",
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wantFiles: map[string]bool{
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"package/alpha/a.pb.go": true,
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"beta/b.pb.go": true,
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},
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wantPackageA: "alpha",
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wantPackageB: "test_beta",
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wantImportsA: map[string]bool{
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// This really doesn't seem like useful behavior.
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"prefixgithub.com/golang/protobuf/proto": true,
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"prefixbeta": true,
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},
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}, {
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// import_path only affects the 'package' line.
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parameters: "import_path=import/path/of/pkg",
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wantPackageA: "alpha",
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wantPackageB: "pkg",
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wantFiles: map[string]bool{
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"package/alpha/a.pb.go": true,
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"beta/b.pb.go": true,
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},
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}, {
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parameters: "Mbeta/b.proto=package/gamma",
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wantFiles: map[string]bool{
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"package/alpha/a.pb.go": true,
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"beta/b.pb.go": true,
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},
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wantPackageA: "alpha",
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wantPackageB: "test_beta",
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wantImportsA: map[string]bool{
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"github.com/golang/protobuf/proto": true,
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// Rewritten by the M parameter.
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"package/gamma": true,
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},
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}, {
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parameters: "import_prefix=prefix,Mbeta/b.proto=package/gamma",
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wantFiles: map[string]bool{
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"package/alpha/a.pb.go": true,
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"beta/b.pb.go": true,
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},
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wantPackageA: "alpha",
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wantPackageB: "test_beta",
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wantImportsA: map[string]bool{
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// import_prefix applies after M.
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"prefixpackage/gamma": true,
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},
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}, {
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parameters: "paths=source_relative",
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wantFiles: map[string]bool{
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"alpha/a.pb.go": true,
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"beta/b.pb.go": true,
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},
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wantPackageA: "alpha",
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wantPackageB: "test_beta",
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}, {
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parameters: "paths=source_relative,import_prefix=prefix",
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wantFiles: map[string]bool{
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// import_prefix doesn't affect filenames.
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"alpha/a.pb.go": true,
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"beta/b.pb.go": true,
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},
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wantPackageA: "alpha",
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wantPackageB: "test_beta",
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}} {
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name := test.parameters
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if name == "" {
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name = "defaults"
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}
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// TODO: Switch to t.Run when we no longer support Go 1.6.
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t.Logf("TEST: %v", name)
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workdir, err := ioutil.TempDir("", "proto-test")
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if err != nil {
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t.Fatal(err)
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}
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defer os.RemoveAll(workdir)
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for _, dir := range []string{"alpha", "beta", "out"} {
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if err := os.MkdirAll(filepath.Join(workdir, dir), 0777); err != nil {
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t.Fatal(err)
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}
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}
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if err := ioutil.WriteFile(filepath.Join(workdir, "alpha", "a.proto"), []byte(aProto), 0666); err != nil {
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t.Fatal(err)
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}
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if err := ioutil.WriteFile(filepath.Join(workdir, "beta", "b.proto"), []byte(bProto), 0666); err != nil {
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t.Fatal(err)
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}
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protoc(t, []string{
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"-I" + workdir,
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"--go_out=" + test.parameters + ":" + filepath.Join(workdir, "out"),
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filepath.Join(workdir, "alpha", "a.proto"),
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})
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protoc(t, []string{
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"-I" + workdir,
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"--go_out=" + test.parameters + ":" + filepath.Join(workdir, "out"),
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filepath.Join(workdir, "beta", "b.proto"),
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})
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contents := make(map[string]string)
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gotFiles := make(map[string]bool)
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outdir := filepath.Join(workdir, "out")
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filepath.Walk(outdir, func(p string, info os.FileInfo, _ error) error {
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if info.IsDir() {
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return nil
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}
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base := filepath.Base(p)
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if base == "a.pb.go" || base == "b.pb.go" {
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b, err := ioutil.ReadFile(p)
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if err != nil {
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t.Fatal(err)
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}
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contents[base] = string(b)
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}
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relPath, _ := filepath.Rel(outdir, p)
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gotFiles[relPath] = true
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return nil
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})
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for got := range gotFiles {
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if runtime.GOOS == "windows" {
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got = filepath.ToSlash(got)
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}
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if !test.wantFiles[got] {
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t.Errorf("unexpected output file: %v", got)
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}
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}
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for want := range test.wantFiles {
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if runtime.GOOS == "windows" {
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want = filepath.FromSlash(want)
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}
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if !gotFiles[want] {
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t.Errorf("missing output file: %v", want)
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}
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}
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gotPackageA, gotImports, err := parseFile(contents["a.pb.go"])
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if err != nil {
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t.Fatal(err)
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}
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gotPackageB, _, err := parseFile(contents["b.pb.go"])
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if err != nil {
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t.Fatal(err)
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}
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if got, want := gotPackageA, test.wantPackageA; want != got {
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t.Errorf("output file a.pb.go is package %q, want %q", got, want)
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}
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if got, want := gotPackageB, test.wantPackageB; want != got {
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t.Errorf("output file b.pb.go is package %q, want %q", got, want)
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}
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missingImport := false
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WantImport:
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for want := range test.wantImportsA {
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for _, imp := range gotImports {
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if `"`+want+`"` == imp {
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continue WantImport
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}
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}
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t.Errorf("output file a.pb.go does not contain expected import %q", want)
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missingImport = true
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}
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if missingImport {
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t.Error("got imports:")
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for _, imp := range gotImports {
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t.Errorf(" %v", imp)
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}
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}
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}
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}
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func TestPackageComment(t *testing.T) {
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workdir, err := ioutil.TempDir("", "proto-test")
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if err != nil {
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t.Fatal(err)
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}
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defer os.RemoveAll(workdir)
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var packageRE = regexp.MustCompile(`(?m)^package .*`)
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for i, test := range []struct {
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goPackageOption string
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wantPackage string
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}{{
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goPackageOption: ``,
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wantPackage: `package proto_package`,
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}, {
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goPackageOption: `option go_package = "go_package";`,
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wantPackage: `package go_package`,
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}, {
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goPackageOption: `option go_package = "import/path/of/go_package";`,
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wantPackage: `package go_package // import "import/path/of/go_package"`,
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}, {
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goPackageOption: `option go_package = "import/path/of/something;go_package";`,
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wantPackage: `package go_package // import "import/path/of/something"`,
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}, {
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goPackageOption: `option go_package = "import_path;go_package";`,
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wantPackage: `package go_package // import "import_path"`,
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}} {
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srcName := filepath.Join(workdir, fmt.Sprintf("%d.proto", i))
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tgtName := filepath.Join(workdir, fmt.Sprintf("%d.pb.go", i))
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buf := &bytes.Buffer{}
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fmt.Fprintln(buf, `syntax = "proto3";`)
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fmt.Fprintln(buf, `package proto_package;`)
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fmt.Fprintln(buf, test.goPackageOption)
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if err := ioutil.WriteFile(srcName, buf.Bytes(), 0666); err != nil {
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t.Fatal(err)
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}
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protoc(t, []string{"-I" + workdir, "--go_out=paths=source_relative:" + workdir, srcName})
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out, err := ioutil.ReadFile(tgtName)
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if err != nil {
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t.Fatal(err)
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}
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pkg := packageRE.Find(out)
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if pkg == nil {
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t.Errorf("generated .pb.go contains no package line\n\nsource:\n%v\n\noutput:\n%v", buf.String(), string(out))
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continue
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}
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if got, want := string(pkg), test.wantPackage; got != want {
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t.Errorf("unexpected package statement with go_package = %q\n got: %v\nwant: %v", test.goPackageOption, got, want)
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}
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}
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}
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// parseFile returns a file's package name and a list of all packages it imports.
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func parseFile(source string) (packageName string, imports []string, err error) {
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fset := token.NewFileSet()
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f, err := parser.ParseFile(fset, "<source>", source, parser.ImportsOnly)
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if err != nil {
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return "", nil, err
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}
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for _, imp := range f.Imports {
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imports = append(imports, imp.Path.Value)
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}
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return f.Name.Name, imports, nil
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}
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func protoc(t *testing.T, args []string) {
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cmd := exec.Command("protoc", "--plugin=protoc-gen-go="+os.Args[0])
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cmd.Args = append(cmd.Args, args...)
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// We set the RUN_AS_PROTOC_GEN_GO environment variable to indicate that
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// the subprocess should act as a proto compiler rather than a test.
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cmd.Env = append(os.Environ(), "RUN_AS_PROTOC_GEN_GO=1")
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out, err := cmd.CombinedOutput()
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if len(out) > 0 || err != nil {
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t.Log("RUNNING: ", strings.Join(cmd.Args, " "))
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}
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if len(out) > 0 {
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t.Log(string(out))
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}
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if err != nil {
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t.Fatalf("protoc: %v", err)
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}
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}
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func hasReleaseTag(want string) bool {
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for _, tag := range build.Default.ReleaseTags {
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if tag == want {
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return true
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}
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}
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return false
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}
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