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/context.go

@@ -0,0 +1,53 @@
+package ctx
+
+import (
+	"errors"
+	"path/filepath"
+
+	"github.com/tal-tech/go-zero/tools/goctl/rpc/execx"
+)
+
+var moduleCheckErr = errors.New("the work directory must be found in the go mod or the $GOPATH")
+
+type (
+	ProjectContext struct {
+		WorkDir string
+		// Name is the root name of the project
+		// eg: go-zero、greet
+		Name string
+		// Path identifies which module a project belongs to, which is module value if it's a go mod project,
+		// or else it is the root name of the project, eg: github.com/tal-tech/go-zero、greet
+		Path string
+		// Dir is the path of the project, eg: /Users/keson/goland/go/go-zero、/Users/keson/go/src/greet
+		Dir string
+	}
+)
+
+// Prepare checks the project which module belongs to,and returns the path and module.
+// workDir parameter is the directory of the source of generating code,
+// where can be found the project path and the project module,
+func Prepare(workDir string) (*ProjectContext, error) {
+	ctx, err := background(workDir)
+	if err == nil {
+		return ctx, nil
+	}
+
+	name := filepath.Base(workDir)
+	_, err = execx.Run("go mod init "+name, workDir)
+	if err != nil {
+		return nil, err
+	}
+	return background(workDir)
+}
+
+func background(workDir string) (*ProjectContext, error) {
+	isGoMod, err := IsGoMod(workDir)
+	if err != nil {
+		return nil, err
+	}
+
+	if isGoMod {
+		return projectFromGoMod(workDir)
+	}
+	return projectFromGoPath(workDir)
+}