Added support to skip creation of go.mod and go.sum in the Go client generator (#16766)

This adds support to avoid generating go.mod and go.sum for Go client.

By default it is set to true to keep compatibility with previous version
of the tool.

It can be set to false using --additional-properties=withGoMod=false

docs/generators/go.md

@@ -29,6 +29,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 |structPrefix|whether to prefix struct with the class name. e.g. DeletePetOpts => PetApiDeletePetOpts| |false|
 |useOneOfDiscriminatorLookup|Use the discriminator's mapping in oneOf to speed up the model lookup. IMPORTANT: Validation (e.g. one and only one match in oneOf's schemas) will be skipped.| |false|
 |withAWSV4Signature|whether to include AWS v4 signature support| |false|
+|withGoMod|Generate go.mod and go.sum| |true|
 |withXml|whether to include support for application/xml content type and include XML annotations in the model (works with libraries that provide support for JSON and XML)| |false|
 
 ## IMPORT MAPPING

modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenConstants.java

@@ -429,4 +429,6 @@ public class CodegenConstants {
                     "<li>setting additionalProperties: false in your schemas</li></ul>";
 
     public static final String FASTAPI_IMPLEMENTATION_PACKAGE = "fastapiImplementationPackage";
+
+    public static final String WITH_GO_MOD = "withGoMod";
 }

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractGoCodegen.java

@@ -49,6 +49,7 @@ public abstract class AbstractGoCodegen extends DefaultCodegen implements Codege
     protected boolean enumClassPrefix = false;
     protected boolean structPrefix = false;
     protected boolean generateInterfaces = false;
+    protected boolean withGoMod = false;
 
     protected String packageName = "openapi";
     protected Set<String> numberTypes;
@@ -804,6 +805,10 @@ public abstract class AbstractGoCodegen extends DefaultCodegen implements Codege
         this.generateInterfaces = generateInterfaces;
     }
 
+    public void setWithGoMod(boolean withGoMod) {
+        this.withGoMod = withGoMod;
+    }
+
     @Override
     public String toDefaultValue(Schema schema) {
         schema = unaliasSchema(schema);

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/GoClientCodegen.java

@@ -56,6 +56,7 @@ public class GoClientCodegen extends AbstractGoCodegen {
     public static final String WITH_AWSV4_SIGNATURE = "withAWSV4Signature";
     public static final String GENERATE_INTERFACES = "generateInterfaces";
     public static final String MODEL_FILE_FOLDER = "modelFileFolder";
+    public static final String WITH_GO_MOD = "withGoMod";
     protected String goImportAlias = "openapiclient";
     protected boolean isGoSubmodule = false;
     protected boolean useOneOfDiscriminatorLookup = false; // use oneOf discriminator's mapping for model lookup
@@ -137,6 +138,8 @@ public class GoClientCodegen extends AbstractGoCodegen {
         disallowAdditionalPropertiesIfNotPresentOpt.setEnum(disallowAdditionalPropertiesIfNotPresentOpts);
         cliOptions.add(disallowAdditionalPropertiesIfNotPresentOpt);
         this.setDisallowAdditionalPropertiesIfNotPresent(true);
+        cliOptions.add(CliOption.newBoolean(WITH_GO_MOD, "Generate go.mod and go.sum", true));
+        this.setWithGoMod(true);
     }
 
     /**
@@ -262,6 +265,13 @@ public class GoClientCodegen extends AbstractGoCodegen {
             modelFileFolder = additionalProperties.get(MODEL_FILE_FOLDER).toString();
         }
 
+        if (additionalProperties.containsKey(WITH_GO_MOD)) {
+            setWithGoMod(Boolean.parseBoolean(additionalProperties.get(WITH_GO_MOD).toString()));
+            additionalProperties.put(WITH_GO_MOD, withGoMod);
+        } else {
+            additionalProperties.put(WITH_GO_MOD, true);
+        }
+
         // add lambda for mustache templates to handle oneOf/anyOf naming
         // e.g. []string => ArrayOfString
         additionalProperties.put("lambda.type-to-name", (Mustache.Lambda) (fragment, writer) -> writer.write(typeToName(fragment.execute())));
@@ -273,8 +283,10 @@ public class GoClientCodegen extends AbstractGoCodegen {
         supportingFiles.add(new SupportingFile("configuration.mustache", "", "configuration.go"));
         supportingFiles.add(new SupportingFile("client.mustache", "", "client.go"));
         supportingFiles.add(new SupportingFile("response.mustache", "", "response.go"));
-        supportingFiles.add(new SupportingFile("go.mod.mustache", "", "go.mod"));
+        if ((boolean)additionalProperties.get(WITH_GO_MOD)) {
-        supportingFiles.add(new SupportingFile("go.sum.mustache", "", "go.sum"));
+            supportingFiles.add(new SupportingFile("go.mod.mustache", "", "go.mod"));
+            supportingFiles.add(new SupportingFile("go.sum.mustache", "", "go.sum"));
+        }
         supportingFiles.add(new SupportingFile(".travis.yml", "", ".travis.yml"));
         supportingFiles.add(new SupportingFile("utils.mustache", "", "utils.go"));
     }

modules/openapi-generator/src/test/java/org/openapitools/codegen/go/GoClientCodegenTest.java

@@ -291,4 +291,46 @@ public class GoClientCodegenTest {
                 "httpRes, err := apiClient.PetAPI.PetDelete(context.Background()).Execute()");
     }
 
+    @Test
+    public void testAdditionalPropertiesWithGoMod() throws Exception {
+        File output = Files.createTempDirectory("test").toFile();
+        output.deleteOnExit();
+
+        final CodegenConfigurator configurator = new CodegenConfigurator()
+                .setGeneratorName("go")
+                .setInputSpec("src/test/resources/3_0/petstore_oas3_test.yaml")
+                .setOutputDir(output.getAbsolutePath().replace("\\", "/"));
+
+        DefaultGenerator generator = new DefaultGenerator();
+        List<File> files = generator.opts(configurator.toClientOptInput()).generate();
+        System.out.println(files);
+        files.forEach(File::deleteOnExit);
+
+        Path goModFile = Paths.get(output + "/go.mod");
+        TestUtils.assertFileExists(goModFile);
+        Path goSumFile = Paths.get(output + "/go.sum");
+        TestUtils.assertFileExists(goSumFile);
+    }
+
+    @Test
+    public void testAdditionalPropertiesWithoutGoMod() throws Exception {
+        File output = Files.createTempDirectory("test").toFile();
+        output.deleteOnExit();
+
+        final CodegenConfigurator configurator = new CodegenConfigurator()
+                .setGeneratorName("go")
+                .setInputSpec("src/test/resources/3_0/petstore_oas3_test.yaml")
+                .setOutputDir(output.getAbsolutePath().replace("\\", "/"))
+                .addAdditionalProperty(GoClientCodegen.WITH_GO_MOD, false);
+
+        DefaultGenerator generator = new DefaultGenerator();
+        List<File> files = generator.opts(configurator.toClientOptInput()).generate();
+        System.out.println(files);
+        files.forEach(File::deleteOnExit);
+
+        Path goModFile = Paths.get(output + "/go.mod");
+        TestUtils.assertFileNotExists(goModFile);
+        Path goSumFile = Paths.get(output + "/go.sum");
+        TestUtils.assertFileNotExists(goSumFile);
+    }
 }

modules/openapi-generator/src/test/java/org/openapitools/codegen/go/GoClientOptionsTest.java

@@ -51,5 +51,6 @@ public class GoClientOptionsTest extends AbstractOptionsTest {
         verify(clientCodegen).setStructPrefix(GoClientOptionsProvider.STRUCT_PREFIX_VALUE);
         verify(clientCodegen).setWithAWSV4Signature(GoClientOptionsProvider.WITH_AWSV4_SIGNATURE);
         verify(clientCodegen).setUseOneOfDiscriminatorLookup(GoClientOptionsProvider.USE_ONE_OF_DISCRIMINATOR_LOOKUP_VALUE);
+        verify(clientCodegen).setWithGoMod(GoClientOptionsProvider.WITH_GO_MOD_VALUE);
     }
 }

modules/openapi-generator/src/test/java/org/openapitools/codegen/options/GoClientOptionsProvider.java

@@ -36,6 +36,7 @@ public class GoClientOptionsProvider implements OptionsProvider {
     public static final boolean GENERATE_INTERFACES_VALUE = true;
     public static final boolean DISALLOW_ADDITIONAL_PROPERTIES_IF_NOT_PRESENT_VALUE = true;
     public static final boolean USE_ONE_OF_DISCRIMINATOR_LOOKUP_VALUE = true;
+    public static final boolean WITH_GO_MOD_VALUE = true;
 
     @Override
     public String getLanguage() {
@@ -56,6 +57,7 @@ public class GoClientOptionsProvider implements OptionsProvider {
                 .put(CodegenConstants.WITH_AWSV4_SIGNATURE_COMMENT, "true")
                 .put(CodegenConstants.DISALLOW_ADDITIONAL_PROPERTIES_IF_NOT_PRESENT, "true")
                 .put(CodegenConstants.USE_ONEOF_DISCRIMINATOR_LOOKUP, "true")
+                .put(CodegenConstants.WITH_GO_MOD, "true")
                 .put("generateInterfaces", "true")
                 .put("structPrefix", "true")
                 .build();