Dolphin - Start secure, global instant messaging today. Private chat, group chat, low-latency audio and video calls.

The development of the IM system is a big challenge, such as Fan-in and Fan-out issues, how to obtain new messages, how to ensure the real-time performance of messages, how to ensure the timing of messages, and multi-terminal synchronization and other pain points.

This is an IM system developed internally for the client group company. Under the premise of limited manpower, material resources, and time resources, it usually needs to make a lot of trade-offs. At this time, an IM system that can support rapid iteration and easy expansion is the optimal solution. , for security reasons, we have carried out cloud privatization deployment.

Here is an example of how we solve pain points and difficulties:

In order to optimize the experience, for read diffusion, the synchronization of messages is mainly based on the push mode. The message ID of a single session increases sequentially. If the front-end receives the pushed message and finds that the message ID is not continuous, it requests the back-end to re-acquire the message.

In addition, our IM system adopts an asynchronous transmission confirmation mechanism, that is, as long as the message reaches the server, and then the server sends it to MQ, it will be considered successful. If the sending fails due to permissions and other issues, the backend will push a notification.