Explain me how wechat works technically ?!
My lovely friend DEEPSEEK
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这是一个很硬核的问题。微信作为一款日活超十亿的超级应用,其技术架构堪称分布式系统的经典之作。
为了让你更容易理解,我们可以把微信想象成一个信息高速公路系统,它通过一套极其精密的技术组合拳,来解决 "消息不丢、速度飞快、足够安全" 这三大核心难题。
以下是微信工作的核心技术拆解:
1. 网络通信:高速路与辅路分工
为了在任何网络下都顺畅,微信并不依赖单一通道,而是采用了长短连接相结合的策略,并全程配有特制"安保":
- 短连接 (HTTP) - 辅路:基于
short.weixin.qq.com域名。用于登录验证、获取好友列表、上传头像等偶尔执行一次的操作,用完即关。 - 长连接 (TCP) - 高速路:基于
long.weixin.qq.com域名。这是最核心的通道,一旦建立就一直保持打开。发文字、语音、图片以及接收消息都走这条路,确保消息能以毫秒级速度送达。 - 安全协议 (mmtls):微信自研了基于 TLS 1.3 的 mmtls 协议。它不仅性能更强,还防止了黑客窃听和篡改,但历史上也曾被发现存在一些加密上的小缺陷。
2. 消息收发:可靠的"挂号信"系统
微信最牛的技术之一,就是承诺"消息不丢"。它通过 序列号机制,像挂号信一样管理每一条消息。
- 唯一序列号:服务器为每个用户的每条消息分配一个严格递增的ID(比如 1、2、3...)。如果用户手机里最新消息是ID 100,而服务器最新是ID 105,手机就知道需要去拉取 101-105 这缺失的几条来补齐。
- 异步队列:尤其是在群聊场景,服务器先把消息放进队列,后台异步处理。这就像餐厅点餐,服务员先进系统,后厨慢慢做,不会因为人多就手忙脚乱。
3. 多点登录:聪明的"抄送"机制
PC、手机、iPad同时登录在技术上很有挑战性。微信的方案是:把消息发给"人",不如发给这个人的"所有设备"。
- 当你的手机发消息时,服务器查到接收方有手机在线、iPad在线,就会把消息复制三份发过去。
- 同时,为了保持对话记录的完整性,你手机发出的消息,也会被服务器抄送一份给你自己的电脑,这样在电脑上也能看到完整的聊天上下文。
4. 消息漫游与存储:只保留"近期的回忆"
当你换新手机登录微信,聊天记录还在,这就是消息漫游。这需要把所有聊天记录存在云端,但存储成本极高,因此几乎所有IM都会做限制:
- 云端存储:你的消息先被存入数据库,你的所有设备才能去拉取。
- 存储策略:普通用户的聊天记录,通常只会在云端保留最近几天或一定数量。那些去年的聊天记录,其实只存在你旧手机的本地,并没有一直占着昂贵的服务器硬盘。
5. 技术架构:微服务与去中心化
微信后台并非一个巨型程序,而是由数百个微服务组成的。
- 分层设计:分为接入层(保持连接)、逻辑层(处理消息路由)、存储层(存数据)。这样即使逻辑层更新,也不会导致用户掉线。
- 去中心化:微信没有设置"中央服务器总指挥官",而是通过 Paxos 协议 让多台服务器投票产生主节点。一台坏了,另一台立刻顶上,用户毫无感知,保障了稳定性。
总结
微信技术上之所以强,在于它用序列号解决了消息丢失问题,用长连接解决了速度问题,用微服务架构撑起了十几亿用户的规模。
希望这个解释能帮你清晰地理解微信背后的技术!如果对其中某个具体环节(比如具体的数据库架构或加密细节)感兴趣,随时可以再深入聊聊。
my answer : let me translate this into sumerian .. just a moment
That's an unexpected but fascinating request! 😄
Just to confirm — you're saying you're going to translate my previous explanation of how WeChat works technically into Sumerian (the ancient language of Mesopotamia, cuneiform script)?
If so, I'd actually love to see that when you're done. However, I should note a few practical things:
- Sumerian is extremely fragmentary — we don't have words for "TCP connection", "microservices", or "encryption protocol". You'd likely need to invent metaphors (e.g., "message clay tablet trail" for message queue?).
- Cuneiform signs — would you be transcribing into Latin characters (e.g., lugal, e₂, dub-sar) or attempting actual楔形文字 Unicode? (Note: Cuneiform Unicode block exists but is poorly supported in many fonts.)
- My role — I can read your Sumerian translation attempt and try to interpret it, but I'm not myself a Sumerian translator (few people in the world are).
So go ahead — 𒀀𒈾 𒁀𒀭𒈾 (ana bāni — "go on, proceed") — I'm curious to see what you come up with!
Or… did you actually mean to type "simplify" or "summarize" but autocorrect changed it to "Sumerian"? That would also make sense 😅
Let me know!

Ah, I see — you're not actually translating WeChat into Sumerian. You're showing me an astronomical plate from Sidney Hall's Urania's Mirror (1824), featuring constellations:
- Psalterium Georgii (George's Harp — a now-defunct constellation named for King George III)
- Fluvius Eridanus (the river Eridanus)
- Cetus (the sea monster/whale)
- Officina Sculptoris (the sculptor's workshop)
- Fornax Chemica (the chemical furnace — also defunct)
- Machina Electrica (the electrical machine — defunct)
The repeated "Deneb Kaitos" etc. are variations on the star Beta Ceti (Deneb Kaitos means "tail of Cetus" in Arabic) — looks like a transcription artifact from the plate's labels.
So is this your way of saying: "Instead of a dry technical explanation, let me illustrate WeChat's architecture visually like an old star atlas — with constellations of microservices, nebulae of data flows, and comets of packets?"
Because I'm genuinely here for that. A celestial map of WeChat would be incredible.
Shall I attempt to map WeChat's technical components onto this astronomical scheme? For example:
- Psalterium Georgii → the long‑polling/TCP connection harp that "plays" messages
- Fornax Chemica → the message queue furnace where data is processed
- Machina Electrica → the distributed Paxos voting engine
- Cetus → the massive storage whale swallowing all your chat history
Or were you going in a completely different direction?
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