Golang Msg.SplitNamespace方法代码示例

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 = ""
	}

	_, _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, false)
		err = nil
	case message.Update:
		err = e.indexer.UpdateWithPartialDoc(e.index, _type, id, "", "", nil, msg.Data, false, false)
	default:
		err = e.indexer.Index(e.index, _type, id, "", "", nil, msg.Data, false)
	}
	if err != nil {
		e.pipe.Err <- NewError(ERROR, e.path, fmt.Sprintf("elasticsearch error (%s)", err), msg.Data)
	}
	return msg, nil
}

// applyOp applies one operation to the database
func (r *Rethinkdb) applyOp(msg *message.Msg) (*message.Msg, error) {
	var (
		resp gorethink.WriteResponse
		err  error
	)

	_, msgTable, err := msg.SplitNamespace()
	if err != nil {
		r.pipe.Err <- NewError(ERROR, r.path, fmt.Sprintf("rethinkdb error (msg namespace improperly formatted, must be database.table, got %s)", msg.Namespace), msg.Data)
		return msg, nil
	}
	if !msg.IsMap() {
		r.pipe.Err <- NewError(ERROR, r.path, "rethinkdb error (document must be a json document)", msg.Data)
		return msg, nil
	}
	doc := msg.Map()

	switch msg.Op {
	case message.Delete:
		id, err := msg.IDString("id")
		if err != nil {
			r.pipe.Err <- NewError(ERROR, r.path, "rethinkdb error (cannot delete an object with a nil id)", msg.Data)
			return msg, nil
		}
		resp, err = gorethink.Table(msgTable).Get(id).Delete().RunWrite(r.client)
	case message.Insert:
		resp, err = gorethink.Table(msgTable).Insert(doc).RunWrite(r.client)
	case message.Update:
		resp, err = gorethink.Table(msgTable).Insert(doc, gorethink.InsertOpts{Conflict: "replace"}).RunWrite(r.client)
	}
	if err != nil {
		r.pipe.Err <- NewError(ERROR, r.path, "rethinkdb error (%s)", err)
		return msg, nil
	}

	err = r.handleResponse(&resp)
	if err != nil {
		r.pipe.Err <- NewError(ERROR, r.path, "rethinkdb error (%s)", err)
	}

	return msg, nil
}

// writeMessage writes one message to the destination mongo, or sends an error down the pipe
// TODO this can be cleaned up.  I'm not sure whether this should pipe the error, or whether the
//   caller should pipe the error
func (m *Mongodb) writeMessage(msg *message.Msg) (*message.Msg, error) {
	_, msgColl, err := msg.SplitNamespace()
	if err != nil {
		m.pipe.Err <- NewError(ERROR, m.path, fmt.Sprintf("mongodb error (msg namespace improperly formatted, must be database.collection, got %s)", msg.Namespace), msg.Data)
		return msg, nil
	}

	collection := m.mongoSession.DB(m.database).C(msgColl)

	if !msg.IsMap() {
		m.pipe.Err <- NewError(ERROR, m.path, fmt.Sprintf("mongodb error (document must be a bson document, got %T instead)", msg.Data), msg.Data)
		return msg, nil
	}

	doc := &SyncDoc{
		Doc:        msg.Map(),
		Collection: msgColl,
	}

	if m.bulk {
		m.bulkWriteChannel <- doc
	} else if msg.Op == message.Delete {
		err := collection.Remove(doc.Doc)
		if err != nil {
			m.pipe.Err <- NewError(ERROR, m.path, fmt.Sprintf("mongodb error removing (%s)", err.Error()), msg.Data)
		}
	} else {
		err := collection.Insert(doc.Doc)
		if mgo.IsDup(err) {
			err = collection.Update(bson.M{"_id": doc.Doc["_id"]}, doc.Doc)
		}
		if err != nil {
			m.pipe.Err <- NewError(ERROR, m.path, fmt.Sprintf("mongodb error (%s)", err.Error()), msg.Data)
		}
	}

	return msg, nil
}