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121 lines
2.3 KiB
121 lines
2.3 KiB
package ipc
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import (
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"encoding/json"
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"errors"
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"fmt"
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"reflect"
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"syscall"
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)
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func NewMsgFactory(msgTypes ...interface{}) MsgFactory {
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mf := (MsgFactory)(make(map[string]func() interface{}))
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for _, mt := range msgTypes {
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if err := mf.register(mt); err != nil {
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defaultLog.Fatalf("failed adding (%T) in NewMsgFactory: %v", mt, err)
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return nil
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}
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}
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return mf
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}
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type MsgFactory map[string](func() interface{})
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func (mf MsgFactory) create(msgType string) (interface{}, error) {
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f, ok := mf[msgType]
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if !ok {
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return nil, fmt.Errorf("cannot create msg type: %s", msgType)
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}
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return f(), nil
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}
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func (mf MsgFactory) register(mt interface{}) error {
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t := reflect.TypeOf(mt)
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if t.Kind() == reflect.Ptr {
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t = t.Elem()
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}
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if t.Kind() != reflect.Struct {
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return errors.New("not a structure")
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}
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if t.NumField() == 0 || len(t.Field(0).Tag) == 0 {
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return errors.New("no tag on first field of structure")
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}
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tag := string(t.Field(0).Tag)
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mf[tag] = func() interface{} {
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v := reflect.New(t)
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return v.Interface()
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}
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return nil
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}
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type Message struct {
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Type string
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MsgID int
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Body interface{}
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Ucred *syscall.Ucred
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Fds []int
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mconn *MsgConn
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}
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type BaseMsg struct {
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Type string
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MsgID int
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IsResponse bool
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Body json.RawMessage
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}
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func (mc *MsgConn) parseMessage(data []byte) (*Message, error) {
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var base BaseMsg
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if err := json.Unmarshal(data, &base); err != nil {
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return nil, err
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}
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body, err := mc.factory.create(base.Type)
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if err != nil {
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return nil, err
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}
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if err := json.Unmarshal(base.Body, body); err != nil {
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return nil, err
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}
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m := new(Message)
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m.Type = base.Type
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m.MsgID = base.MsgID
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m.Body = body
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return m, nil
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}
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func (m *Message) Free() {
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for _, fd := range m.Fds {
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syscall.Close(fd)
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}
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m.Fds = nil
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}
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func (m *Message) parseControlData(data []byte) error {
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cmsgs, err := syscall.ParseSocketControlMessage(data)
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if err != nil {
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return err
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}
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for _, cmsg := range cmsgs {
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switch cmsg.Header.Type {
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case syscall.SCM_CREDENTIALS:
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cred, err := syscall.ParseUnixCredentials(&cmsg)
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if err != nil {
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return err
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}
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m.Ucred = cred
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case syscall.SCM_RIGHTS:
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fds, err := syscall.ParseUnixRights(&cmsg)
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if err != nil {
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return err
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}
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m.Fds = fds
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}
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}
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return nil
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}
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func (m *Message) Respond(msg interface{}, fds ...int) error {
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return m.mconn.sendMessage(msg, m.MsgID, fds...)
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}
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