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/gomod.go

@@ -0,0 +1,47 @@
+package ctx
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+
+	"github.com/tal-tech/go-zero/core/jsonx"
+	"github.com/tal-tech/go-zero/tools/goctl/rpc/execx"
+)
+
+type Module struct {
+	Path      string
+	Main      bool
+	Dir       string
+	GoMod     string
+	GoVersion string
+}
+
+// projectFromGoMod is used to find the go module and project file path
+// the workDir flag specifies which folder we need to detect based on
+// only valid for go mod project
+func projectFromGoMod(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
+	}
+
+	data, err := execx.Run("go list -json -m", workDir)
+	if err != nil {
+		return nil, err
+	}
+
+	var m Module
+	err = jsonx.Unmarshal([]byte(data), &m)
+	if err != nil {
+		return nil, err
+	}
+	var ret ProjectContext
+	ret.WorkDir = workDir
+	ret.Name = filepath.Base(m.Dir)
+	ret.Dir = m.Dir
+	ret.Path = m.Path
+	return &ret, nil
+}