Add option to edit fullPackageName for hashing in protoc-gen-ext (#568)

* add option to edit fullPackageName for hashing in protoc-gen-ext

* generate code

* add changelog

* replace go.mod reference with actual lib version

changelog/v0.40.3/replace-package-name-for-hashing.yaml

@@ -0,0 +1,7 @@
+changelog:
+  - type: NEW_FEATURE
+    issueLink: https://github.com/solo-io/gloo-mesh-enterprise/issues/17070
+    resolvesIssue: false
+    description: >
+      Add option to find and replace portion of the package name of a proto as it is used in the hash function.
+      It is used to provide an option for users to maintain the hashing logic when the package name of a proto changes.

codegen/collector/compiler.go

@@ -56,6 +56,10 @@ type ProtocOptions struct {
 
 	// Extra flags to provide to invocations of protoc
 	ProtocExtraFlags []string
+
+	// When set, it will replace the value before the "=" with the value after it in the hash function of the generated code.
+	// This is use to maintain backward compatibility of the hash function in the case where the package name changes.
+	TransformPackageForHash string
 }
 
 type protoCompiler struct {
@@ -198,9 +202,13 @@ func (p *protoCompiler) writeDescriptors(protoFile, toFile string, imports []str
 	gogoArgs := append(defaultGogoArgs, p.customArgs...)
 
 	if compileProtos {
+		extArgs := gogoArgs
+		if p.protocOptions.TransformPackageForHash != "" {
+			extArgs = append(extArgs, fmt.Sprintf("transform_package_for_hash=%s", p.protocOptions.TransformPackageForHash))
+		}
 		cmd.Args = append(cmd.Args,
 			"--go_out="+strings.Join(gogoArgs, ",")+":"+p.descriptorOutDir,
-			"--ext_out="+strings.Join(gogoArgs, ",")+":"+p.descriptorOutDir,
+			"--ext_out="+strings.Join(extArgs, ",")+":"+p.descriptorOutDir,
 		)
 
 		// Externally specify mappings between proto files and generated Go code, for proto source files that do not specify `go_package`

go.mod

@@ -43,7 +43,7 @@ require (
 	github.com/solo-io/go-list-licenses v0.0.4
 	github.com/solo-io/go-utils v0.21.4
 	github.com/solo-io/k8s-utils v0.0.1
-	github.com/solo-io/protoc-gen-ext v0.0.18
+	github.com/solo-io/protoc-gen-ext v0.0.20
 	github.com/solo-io/protoc-gen-openapi v0.2.4
 	github.com/spf13/pflag v1.0.5
 	go.uber.org/zap v1.26.0

go.sum

@@ -814,8 +814,8 @@ github.com/solo-io/go-utils v0.21.4 h1:BUOrGNV+zQGIEKTS02SyPqevmkyG+AMl+0+czBg9a
 github.com/solo-io/go-utils v0.21.4/go.mod h1:6e8K1spnMWwlnJRSNp/J84GEyJbrcK4Gm7i+ehzCi8c=
 github.com/solo-io/k8s-utils v0.0.1 h1:e2alFsqTT7GU10d6cFDX2y+86J142DrsRwy5itvvZOI=
 github.com/solo-io/k8s-utils v0.0.1/go.mod h1:53N9+9Gl2MwqIZJ7/ocA9gKvWt+6z7MPD2qKQix7oFE=
-github.com/solo-io/protoc-gen-ext v0.0.18 h1:zSAL8NzWpJUGYoA5IyjHiKASNyHjR0uxBQ7eQS94i3A=
-github.com/solo-io/protoc-gen-ext v0.0.18/go.mod h1:iGyCvmKmhJNXs5MgBcYFBF0om7LDnCVD2WwhOZGnqeA=
+github.com/solo-io/protoc-gen-ext v0.0.20 h1:0cE+DvIp7G97/xlETL3didPQ1s5SHav5mkebljXk/Ws=
+github.com/solo-io/protoc-gen-ext v0.0.20/go.mod h1:iGyCvmKmhJNXs5MgBcYFBF0om7LDnCVD2WwhOZGnqeA=
 github.com/solo-io/protoc-gen-openapi v0.2.4 h1:9tqGhCAq83IRSzHhKDzpWnPlbPPORTM2izVxjLk0Ftw=
 github.com/solo-io/protoc-gen-openapi v0.2.4/go.mod h1:osEjRl1miHqlq4Wl/8SEqHFoyydptPL1EzEdM9c4vfE=
 github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=