Golang Msg.Data方法代码示例

func (t *Transformer) toMsg(incoming interface{}, msg *message.Msg) error {

	switch newMsg := incoming.(type) {
	case map[string]interface{}: // we're a proper message.Msg, so copy the data over
		msg.Op = message.OpTypeFromString(newMsg["op"].(string))
		msg.Timestamp = newMsg["ts"].(int64)
		msg.Namespace = newMsg["ns"].(string)

		switch data := newMsg["data"].(type) {
		case otto.Value:
			exported, err := data.Export()
			if err != nil {
				t.pipe.Err <- t.transformerError(ERROR, err, msg)
				return nil
			}
			d, err := mejson.Unmarshal(exported.(map[string]interface{}))
			if err != nil {
				t.pipe.Err <- t.transformerError(ERROR, err, msg)
				return nil
			}
			msg.Data = map[string]interface{}(d)
		case map[string]interface{}:
			d, err := mejson.Unmarshal(data)
			if err != nil {
				t.pipe.Err <- t.transformerError(ERROR, err, msg)
				return nil
			}
			msg.Data = map[string]interface{}(d)
		default:
			msg.Data = data
		}
	case bool: // skip this doc if we're a bool and we're false
		if !newMsg {
			msg.Op = message.Noop
			return nil
		}
	default: // something went wrong
		return fmt.Errorf("returned doc was not a map[string]interface{}")
	}

	return nil
}

func (e *Elasticsearch) applyOp(msg *message.Msg) (*message.Msg, error) {
	if msg.Op == message.Command {
		err := e.runCommand(msg)
		if err != nil {
			e.pipe.Err <- NewError(ERROR, e.path, fmt.Sprintf("elasticsearch error (%s)", err), msg.Data)
		}
		return msg, nil
	}

	// TODO there might be some inconsistency here.  elasticsearch uses the _id field for an primary index,
	//  and we're just mapping it to a string here.
	id, err := msg.IDString("_id")
	if err != nil {
		id = ""
	}

	// Possible fix for #151 issue: code added to make it working with elastic 2 and mongo (now it's possible to use _id)
	if len(id) > 0 {
		var message = msg.Map()
		delete(message, "_id")
		msg.Data = message
	}

	_, _type, err := msg.SplitNamespace()
	if err != nil {
		e.pipe.Err <- NewError(ERROR, e.path, fmt.Sprintf("unable to determine type from msg.Namespace (%s)", msg.Namespace), msg)
		return msg, nil
	}
	switch msg.Op {
	case message.Delete:
		e.indexer.Delete(e.index, _type, id)
		err = nil
	default:
		err = e.indexer.Index(e.index, _type, id, "", "", nil, msg.Data)
	}
	if err != nil {
		e.pipe.Err <- NewError(ERROR, e.path, fmt.Sprintf("elasticsearch error (%s)", err), msg.Data)
	}
	return msg, nil
}

func (t *Transformer) transformOne(msg *message.Msg) (*message.Msg, error) {

	var (
		doc    interface{}
		value  otto.Value
		outDoc otto.Value
		result interface{}
		err    error
	)

	// short circuit for deletes and commands
	if msg.Op == message.Delete || msg.Op == message.Command {
		return msg, nil
	}

	now := time.Now().Nanosecond()
	if msg.IsMap() {
		if doc, err = mejson.Marshal(msg.Data); err != nil {
			t.pipe.Err <- t.transformerError(ERROR, err, msg)
			return msg, nil
		}
	} else {
		doc = msg.Data
	}

	if value, err = t.vm.ToValue(doc); err != nil {
		t.pipe.Err <- t.transformerError(ERROR, err, msg)
		return msg, nil
	}

	// now that we have finished casting our map to a bunch of different types,
	// lets run our transformer on the document
	beforeVM := time.Now().Nanosecond()
	if outDoc, err = t.vm.Call(`module.exports`, nil, value); err != nil {
		t.pipe.Err <- t.transformerError(ERROR, err, msg)
		return msg, nil
	}

	if result, err = outDoc.Export(); err != nil {
		t.pipe.Err <- t.transformerError(ERROR, err, msg)
		return msg, nil
	}

	afterVM := time.Now().Nanosecond()

	switch r := result.(type) {
	case map[string]interface{}:
		doc, err := mejson.Unmarshal(r)
		if err != nil {
			t.pipe.Err <- t.transformerError(ERROR, err, msg)
			return msg, nil
		}
		msg.Data = map[string]interface{}(doc)
	default:
		msg.Data = r
	}

	if t.debug {
		then := time.Now().Nanosecond()
		fmt.Printf("document transformed in %dus.  %d to marshal, %d in the vm, %d to unmarshal\n", (then-now)/1000, (beforeVM-now)/1000, (afterVM-beforeVM)/1000, (then-afterVM)/1000)
	}

	return msg, nil
}

func (t *Transformer) transformOne(msg *message.Msg) (*message.Msg, error) {

	var (
		doc    interface{}
		value  otto.Value
		outDoc otto.Value
		result interface{}
		err    error
	)

	// short circuit for deletes and commands
	if msg.Op == message.Command {
		return msg, nil
	}

	now := time.Now().Nanosecond()
	fullDoc := map[string]interface{}{
		"data": msg.Data,
		"ts":   msg.Timestamp,
		"op":   msg.Op.String(),
	}
	if msg.IsMap() {
		if doc, err = mejson.Marshal(msg.Data); err != nil {
			t.pipe.Err <- t.transformerError(ERROR, err, msg)
			return msg, nil
		}
		fullDoc["data"] = doc
	}

	if value, err = t.vm.ToValue(fullDoc); err != nil {
		t.pipe.Err <- t.transformerError(ERROR, err, msg)
		return msg, nil
	}

	// now that we have finished casting our map to a bunch of different types,
	// lets run our transformer on the document
	beforeVM := time.Now().Nanosecond()
	if outDoc, err = t.vm.Call(`module.exports`, nil, value); err != nil {
		t.pipe.Err <- t.transformerError(ERROR, err, msg)
		return msg, nil
	}

	if result, err = outDoc.Export(); err != nil {
		t.pipe.Err <- t.transformerError(ERROR, err, msg)
		return msg, nil
	}

	afterVM := time.Now().Nanosecond()

	fullDoc, ok := result.(map[string]interface{})
	if !ok {
		t.pipe.Err <- t.transformerError(ERROR, fmt.Errorf("returned doc was not a map[string]interface{}"), msg)
		return msg, fmt.Errorf("returned doc was not a map[string]interface{}")
	}

	msg.Op = message.OpTypeFromString(fullDoc["op"].(string))
	msg.Timestamp = fullDoc["ts"].(int64)
	switch data := fullDoc["data"].(type) {
	case otto.Value:
		exported, err := data.Export()
		if err != nil {
			t.pipe.Err <- t.transformerError(ERROR, err, msg)
			return msg, nil
		}
		d, err := mejson.Unmarshal(exported.(map[string]interface{}))
		if err != nil {
			t.pipe.Err <- t.transformerError(ERROR, err, msg)
			return msg, nil
		}
		msg.Data = map[string]interface{}(d)
	case map[string]interface{}:
		d, err := mejson.Unmarshal(data)
		if err != nil {
			t.pipe.Err <- t.transformerError(ERROR, err, msg)
			return msg, nil
		}
		msg.Data = map[string]interface{}(d)
	default:
		msg.Data = data
	}

	if t.debug {
		then := time.Now().Nanosecond()
		fmt.Printf("document transformed in %dus.  %d to marshal, %d in the vm, %d to unmarshal\n", (then-now)/1000, (beforeVM-now)/1000, (afterVM-beforeVM)/1000, (then-afterVM)/1000)
	}

	return msg, nil
}