reactor rpc (#179)

* reactor rpc generation

* update flag

* update command

* update command

* update unit test

* delete test file

* optimize code

* update doc

* update gen pb

* rename target dir

* update mysql data type convert rule

* add done flag

* optimize req/reply parameter

* optimize req/reply parameter

* remove waste code

* remove duplicate parameter

* format code

* format code

* optimize naming

* reactor rpcv2 to rpc

* remove new line

* format code

* rename underline to snake

* reactor getParentPackage

* remove debug log

* reactor background

tools/goctl/util/ctx/gopath.go

@@ -0,0 +1,47 @@
+package ctx
+
+import (
+	"errors"
+	"go/build"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/tal-tech/go-zero/tools/goctl/util"
+)
+
+// projectFromGoPath is used to find the main module and project file path
+// the workDir flag specifies which folder we need to detect based on
+// only valid for go mod project
+func projectFromGoPath(workDir string) (*ProjectContext, error) {
+	if len(workDir) == 0 {
+		return nil, errors.New("the work directory is not found")
+	}
+	if _, err := os.Stat(workDir); err != nil {
+		return nil, err
+	}
+
+	buildContext := build.Default
+	goPath := buildContext.GOPATH
+	goSrc := filepath.Join(goPath, "src")
+	if !util.FileExists(goSrc) {
+		return nil, moduleCheckErr
+	}
+
+	wd, err := filepath.Abs(workDir)
+	if err != nil {
+		return nil, err
+	}
+
+	if !strings.HasPrefix(wd, goSrc) {
+		return nil, moduleCheckErr
+	}
+
+	projectName := strings.TrimPrefix(wd, goSrc+string(filepath.Separator))
+	return &ProjectContext{
+		WorkDir: workDir,
+		Name:    projectName,
+		Path:    projectName,
+		Dir:     filepath.Join(goSrc, projectName),
+	}, nil
+}