[Go] Add Go API client generator

bin/go-petstore.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+
+SCRIPT="$0"
+
+while [ -h "$SCRIPT" ] ; do
+  ls=`ls -ld "$SCRIPT"`
+  link=`expr "$ls" : '.*-> \(.*\)$'`
+  if expr "$link" : '/.*' > /dev/null; then
+    SCRIPT="$link"
+  else
+    SCRIPT=`dirname "$SCRIPT"`/"$link"
+  fi
+done
+
+if [ ! -d "${APP_DIR}" ]; then
+  APP_DIR=`dirname "$SCRIPT"`/..
+  APP_DIR=`cd "${APP_DIR}"; pwd`
+fi
+
+executable="./modules/swagger-codegen-cli/target/swagger-codegen-cli.jar"
+
+if [ ! -f "$executable" ]
+then
+  mvn clean package
+fi
+
+# if you've executed sbt assembly previously it will use that instead.
+export JAVA_OPTS="${JAVA_OPTS} -XX:MaxPermSize=256M -Xmx1024M -DloggerPath=conf/log4j.properties"
+ags="$@ generate -t modules/swagger-codegen/src/main/resources/go -i modules/swagger-codegen/src/test/resources/2_0/petstore.json -l go -o samples/client/petstore/go"
+
+java $JAVA_OPTS -jar $executable $ags

bin/windows/go-petstore.bat

@@ -0,0 +1,10 @@
+set executable=.\modules\swagger-codegen-cli\target\swagger-codegen-cli.jar
+
+If Not Exist %executable% (
+  mvn clean package
+)
+
+set JAVA_OPTS=%JAVA_OPTS% -XX:MaxPermSize=256M -Xmx1024M -DloggerPath=conf/log4j.properties
+set ags=generate -t modules\swagger-codegen\src\main\resources\go -i modules\swagger-codegen\src\test\resources\2_0\petstore.json -l go -o samples\client\petstore\go
+
+java %JAVA_OPTS% -jar %executable% %ags%

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/GoClientCodegen.java

@@ -0,0 +1,283 @@
+package io.swagger.codegen.languages;
+
+import io.swagger.codegen.*;
+import io.swagger.models.properties.ArrayProperty;
+import io.swagger.models.properties.MapProperty;
+import io.swagger.models.properties.Property;
+
+import java.io.File;
+import java.util.*;
+
+import org.apache.commons.lang.StringUtils;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class GoClientCodegen extends DefaultCodegen implements CodegenConfig {
+    static Logger LOGGER = LoggerFactory.getLogger(GoClientCodegen.class);
+
+    protected String packageName = "swagger";
+    protected String packageVersion = "1.0.0";
+
+    public CodegenType getTag() {
+        return CodegenType.CLIENT;
+    }
+
+    public String getName() {
+        return "go";
+    }
+
+    public String getHelp() {
+        return "Generates a Go client library (beta).";
+    }
+
+    public GoClientCodegen() {
+        super();
+        outputFolder = "generated-code/go";
+        modelTemplateFiles.put("model.mustache", ".go");
+        apiTemplateFiles.put("api.mustache", ".go");
+        templateDir = "go";
+
+        reservedWords = new HashSet<String> (
+            Arrays.asList(
+                "break", "default", "func", "interface", "select",
+                "case", "defer", "go", "map", "struct",
+                "chan", "else", "goto", "package", "switch",
+                "const", "fallthrough", "if", "range", "type",
+                "continue", "for", "import", "return", "var")
+        );
+
+        defaultIncludes = new HashSet<String>(
+                Arrays.asList(
+                    "map",
+                    "array")
+                );
+
+        languageSpecificPrimitives = new HashSet<String>(
+            Arrays.asList(
+                "string",
+                "bool",
+                "uint",
+                "uint32",
+                "uint64",
+                "int",
+                "int32",
+                "int64",
+                "float32",
+                "float64",
+                "complex64",
+                "complex128",
+                "rune",
+                "byte")
+            );
+
+        instantiationTypes.clear();
+        /*instantiationTypes.put("array", "GoArray");
+        instantiationTypes.put("map", "GoMap");*/
+
+        typeMapping.clear();
+        typeMapping.put("integer", "int32");
+        typeMapping.put("long", "int64");
+        typeMapping.put("float", "float32");
+        typeMapping.put("double", "float64");
+        typeMapping.put("boolean", "bool");
+        typeMapping.put("string", "string");
+        typeMapping.put("Date", "time.Time");
+        typeMapping.put("DateTime", "time.Time");
+        typeMapping.put("password", "string");
+        typeMapping.put("File", "*os.File");
+        typeMapping.put("file", "*os.File");
+        // map binary to string as a workaround
+        // the correct solution is to use []byte
+        typeMapping.put("binary", "string");
+
+        importMapping = new HashMap<String, String>();
+        importMapping.put("time.Time", "time");
+        importMapping.put("*os.File", "os");
+
+        cliOptions.clear();
+        cliOptions.add(new CliOption(CodegenConstants.PACKAGE_NAME, "Go package name (convention: lowercase).")
+                .defaultValue("swagger"));
+        cliOptions.add(new CliOption(CodegenConstants.PACKAGE_VERSION, "Go package version.")
+                .defaultValue("1.0.0"));
+
+    }
+
+    @Override
+    public void processOpts() {
+        //super.processOpts();
+
+        if (additionalProperties.containsKey(CodegenConstants.PACKAGE_NAME)) {
+            setPackageName((String) additionalProperties.get(CodegenConstants.PACKAGE_NAME));
+        }
+        else {
+            setPackageName("swagger");
+        }
+
+        if (additionalProperties.containsKey(CodegenConstants.PACKAGE_VERSION)) {
+            setPackageVersion((String) additionalProperties.get(CodegenConstants.PACKAGE_VERSION));
+        }
+        else {
+            setPackageVersion("1.0.0");
+        }
+
+        additionalProperties.put(CodegenConstants.PACKAGE_NAME, packageName);
+        additionalProperties.put(CodegenConstants.PACKAGE_VERSION, packageVersion);
+
+        modelPackage = packageName;
+        apiPackage = packageName;
+
+        supportingFiles.add(new SupportingFile("README.mustache", "", "README.md"));
+    }    
+
+    @Override
+    public String escapeReservedWord(String name) {
+        return "_" + name;
+    }
+
+    @Override
+    public String apiFileFolder() {
+        return outputFolder + File.separator + packageName;
+    }
+
+    public String modelFileFolder() {
+        return outputFolder + File.separator + packageName;
+    }
+
+    @Override
+    public String toVarName(String name) {
+        // replace - with _ e.g. created-at => created_at
+        name = name.replaceAll("-", "_");
+
+        // if it's all uppper case, do nothing
+        if (name.matches("^[A-Z_]*$"))
+            return name;
+
+        // camelize (lower first character) the variable name
+        // pet_id => PetId
+        name = camelize(name);
+
+        // for reserved word or word starting with number, append _
+        if(reservedWords.contains(name) || name.matches("^\\d.*"))
+            name = escapeReservedWord(name);
+
+        return name;
+    }
+
+    @Override
+    public String toParamName(String name) {
+        // should be the same as variable name
+        return toVarName(name);
+    }
+
+    @Override
+    public String toModelName(String name) {
+        // model name cannot use reserved keyword, e.g. return
+        if(reservedWords.contains(name))
+            throw new RuntimeException(name + " (reserved word) cannot be used as a model name");
+
+        // camelize the model name
+        // phone_number => PhoneNumber
+        return camelize(name);
+    }
+
+    @Override
+    public String toModelFilename(String name) {
+        // should be the same as the model name
+        return toModelName(name);
+    }
+
+    @Override
+    public String getTypeDeclaration(Property p) {
+        if(p instanceof ArrayProperty) {
+            ArrayProperty ap = (ArrayProperty) p;
+            Property inner = ap.getItems();
+            return "[]" + getTypeDeclaration(inner);
+        }
+        else if (p instanceof MapProperty) {
+            MapProperty mp = (MapProperty) p;
+            Property inner = mp.getAdditionalProperties();
+
+            return getSwaggerType(p) + "[string]" + getTypeDeclaration(inner);
+        }
+        return super.getTypeDeclaration(p);
+    }
+
+    @Override
+    public String getSwaggerType(Property p) {
+        String swaggerType = super.getSwaggerType(p);
+        String type = null;
+        if(typeMapping.containsKey(swaggerType)) {
+            type = typeMapping.get(swaggerType);
+            if(languageSpecificPrimitives.contains(type))
+                return (type);
+        }
+        else
+            type = swaggerType;
+        return type;
+    }
+
+    @Override
+    public String toOperationId(String operationId) {
+        // method name cannot use reserved keyword, e.g. return
+        if(reservedWords.contains(operationId))
+            throw new RuntimeException(operationId + " (reserved word) cannot be used as method name");
+
+        return camelize(operationId);
+    }
+
+    @Override
+    public Map<String, Object> postProcessOperations(Map<String, Object> objs) {
+        @SuppressWarnings("unchecked")
+        Map<String, Object> objectMap = (Map<String, Object>) objs.get("operations");
+        @SuppressWarnings("unchecked")
+        List<CodegenOperation> operations = (List<CodegenOperation>) objectMap.get("operation");
+        for (CodegenOperation operation : operations) {
+            // http method verb conversion (e.g. PUT => Put)
+            operation.httpMethod = camelize(operation.httpMethod.toLowerCase());
+        }
+
+        // remove model imports to avoid error
+        List<Map<String, String>> imports = (List<Map<String, String>>) objs.get("imports");
+        if (imports == null)
+            return objs;
+
+        Iterator<Map<String, String>> iterator = imports.iterator();
+        while (iterator.hasNext()) {
+            String _import = iterator.next().get("import");
+            if (_import.startsWith(apiPackage()))
+                iterator.remove();
+        }
+
+        return objs;
+    }
+
+    @Override
+    public Map<String, Object> postProcessModels(Map<String, Object> objs) {
+        // remove model imports to avoid error
+        List<Map<String, String>> imports = (List<Map<String, String>>) objs.get("imports");
+        final String prefix = modelPackage();
+        Iterator<Map<String, String>> iterator = imports.iterator();
+        while (iterator.hasNext()) {
+            String _import = iterator.next().get("import");
+            if (_import.startsWith(prefix))
+                iterator.remove();
+        }
+        return objs;
+    }
+
+    @Override
+    protected boolean needToImport(String type) {
+        return !defaultIncludes.contains(type)
+            && !languageSpecificPrimitives.contains(type);
+    }
+
+    public void setPackageName(String packageName) {
+        this.packageName = packageName;
+    }
+
+    public void setPackageVersion(String packageVersion) {
+        this.packageVersion = packageVersion;
+    }
+
+}

modules/swagger-codegen/src/main/resources/META-INF/services/io.swagger.codegen.CodegenConfig

@@ -4,6 +4,7 @@ io.swagger.codegen.languages.CSharpClientCodegen
 io.swagger.codegen.languages.DartClientCodegen
 io.swagger.codegen.languages.FlashClientCodegen
 io.swagger.codegen.languages.FlaskConnexionCodegen
+io.swagger.codegen.languages.GoClientCodegen
 io.swagger.codegen.languages.JavaClientCodegen
 io.swagger.codegen.languages.JavascriptClientCodegen
 io.swagger.codegen.languages.JaxRSServerCodegen

modules/swagger-codegen/src/main/resources/go/README.mustache

@@ -0,0 +1,12 @@
+# Go API client for {{packageName}}
+
+## Overview
+This API client was generated by the [swagger-codegen](https://github.com/swagger-api/swagger-codegen) project.  By using the [swagger-spec](https://github.com/swagger-api/swagger-spec) from a remote server, you can easily generate an API client.
+
+
+## Installation
+Put the package under your project folder and add the following in import:
+```
+    "./{{packageName}}"
+```
+