feat(internal/gapicgen): change versionClient for gapics

internal/gapicgen/generator/_version.go.txt

@@ -0,0 +1,23 @@
+// Copyright {{.Year}} Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by gapicgen. DO NOT EDIT.
+
+package {{.Package}}
+
+import "{{.ModuleRootInternal}}"
+
+func init() {
+    versionClient = internal.Version
+}

internal/gapicgen/generator/gapics.go

@@ -24,6 +24,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"cloud.google.com/go/internal/gapicgen/execv"
 	"cloud.google.com/go/internal/gapicgen/execv/gocmd"
@@ -37,6 +38,8 @@ var (
 	changesTmpl string
 	//go:embed _README.md.txt
 	readmeTmpl string
+	//go:embed _version.go.txt
+	versionTmpl string
 )
 
 // GapicGenerator is used to regenerate gapic libraries.
@@ -106,6 +109,9 @@ func (g *GapicGenerator) Regen(ctx context.Context) error {
 				return nil
 			}
 		}
+		if err := g.genVersionFile(c); err != nil {
+			return err
+		}
 	}
 
 	if err := g.copyMicrogenFiles(); err != nil {
@@ -117,10 +123,6 @@ func (g *GapicGenerator) Regen(ctx context.Context) error {
 		return err
 	}
 
-	if err := g.resetUnknownVersion(); err != nil {
-		return err
-	}
-
 	if g.regenOnly {
 		return nil
 	}
@@ -254,39 +256,6 @@ go mod edit -dropreplace "google.golang.org/genproto"
 	return c.Run()
 }
 
-// resetUnknownVersion resets doc.go files that have only had their version
-// changed to UNKNOWN by the generator.
-func (g *GapicGenerator) resetUnknownVersion() error {
-	files, err := git.FindModifiedFiles(g.googleCloudDir)
-	if err != nil {
-		return err
-	}
-
-	for _, file := range files {
-		if !strings.HasSuffix(file, "doc.go") {
-			continue
-		}
-		diff, err := git.FileDiff(g.googleCloudDir, file)
-		if err != nil {
-			return err
-		}
-		// More than one diff, don't reset.
-		if strings.Count(diff, "@@") != 2 {
-			log.Println(diff)
-			continue
-		}
-		// Not related to version, don't reset.
-		if !strings.Contains(diff, "+const versionClient = \"UNKNOWN\"") {
-			continue
-		}
-
-		if err := git.ResetFile(g.googleCloudDir, file); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
 // setVersion updates the versionClient constant in all .go files. It may create
 // .backup files on certain systems (darwin), and so should be followed by a
 // clean-up of .backup files.
@@ -359,6 +328,33 @@ func (g *GapicGenerator) microgen(conf *microgenConfig) error {
 	return c.Run()
 }
 
+func (g *GapicGenerator) genVersionFile(conf *microgenConfig) error {
+	relDir := strings.TrimPrefix(conf.importPath, "cloud.google.com/go/")
+	rootPackage := strings.Split(relDir, "/")[0]
+	rootModInternal := fmt.Sprintf("cloud.google.com/go/%s/internal", rootPackage)
+
+	f, err := os.Create(filepath.Join(g.googleCloudDir, relDir, "version.go"))
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	t := template.Must(template.New("version").Parse(versionTmpl))
+	versionData := struct {
+		Year               int
+		Package            string
+		ModuleRootInternal string
+	}{
+		Year:               time.Now().Year(),
+		Package:            conf.pkg,
+		ModuleRootInternal: rootModInternal,
+	}
+	if err := t.Execute(f, versionData); err != nil {
+		return err
+	}
+	return nil
+}
+
 // manifestEntry is used for JSON marshaling in manifest.
 type manifestEntry struct {
 	DistributionName  string      `json:"distribution_name"`

internal/gapicgen/go.mod

@@ -1,14 +1,12 @@
 module cloud.google.com/go/internal/gapicgen
 
-go 1.16
+go 1.17
 
 require (
 	cloud.google.com/go v0.100.2
 	cloud.google.com/go/internal/godocfx v0.0.0-20220124075323-fc08c49fc013
 	github.com/google/go-github/v35 v35.3.0
 	github.com/shurcooL/githubv4 v0.0.0-20220115235240-a14260e6f8a2
-	github.com/shurcooL/graphql v0.0.0-20200928012149-18c5c3165e3a // indirect
-	github.com/stretchr/testify v1.7.0 // indirect
 	golang.org/x/oauth2 v0.0.0-20211104180415-d3ed0bb246c8
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 	golang.org/x/sys v0.0.0-20220114195835-da31bd327af9
@@ -17,3 +15,25 @@ require (
 	gopkg.in/src-d/go-git.v4 v4.13.1
 	gopkg.in/yaml.v2 v2.4.0
 )
+
+require (
+	github.com/emirpasic/gods v1.12.0 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/go-querystring v1.0.0 // indirect
+	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
+	github.com/kevinburke/ssh_config v0.0.0-20190725054713-01f96b0aa0cd // indirect
+	github.com/mitchellh/go-homedir v1.1.0 // indirect
+	github.com/sergi/go-diff v1.0.0 // indirect
+	github.com/shurcooL/graphql v0.0.0-20200928012149-18c5c3165e3a // indirect
+	github.com/src-d/gcfg v1.4.0 // indirect
+	github.com/stretchr/testify v1.7.0 // indirect
+	github.com/xanzy/ssh-agent v0.2.1 // indirect
+	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 // indirect
+	golang.org/x/mod v0.5.1 // indirect
+	golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f // indirect
+	golang.org/x/tools v0.1.8 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	gopkg.in/src-d/go-billy.v4 v4.3.2 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
+)