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- Add 5 new slide pages: eino-deep-dive, ratelimit-overview, ratelimit-lua, async-deep-dive, harness - Add 4 new drawio SVGs: pipeline-detail, ratelimit, async-task, harness - Update all existing slides with v-clicks progressive reveal - Add presenter notes and interactive prompts - Expand slides.md to register all new pages (16 → 25+ slides) - Fix text overflow by trimming content per Item block - Add Eino Graph deep dive: WithGenLocalState, Pre/Post Handler, branch routing - Add rate limiting section: algorithm comparison, Lua script, Gin middleware - Add async task deep dive: TaskQueue FIFO, context progress injection - Add consistency section: style/pipeline/data/deployment 4-layer guarantees
61 lines
1.5 KiB
Markdown
61 lines
1.5 KiB
Markdown
# 令牌桶 — Redis Lua 脚本
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原子操作，单次 Redis 往返
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<div class="mt-2">
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```lua {1-2|4-8|10-14|all}
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local data = redis.call('HMGET', key, 'tokens', 'ts')
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local tokens = tonumber(data[1])
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local last_ts = tonumber(data[2])
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-- 首次访问，初始化满桶
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if tokens == nil then
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tokens = burst
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last_ts = now
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end
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-- 计算时间差，补充令牌
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local delta = now - last_ts
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if delta > 0 then
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local refill = (delta * rate) / 1000
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tokens = math.min(burst, tokens + refill)
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end
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```
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</div>
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<v-clicks>
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<Item title="为什么用 Lua 脚本？">
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整个令牌桶逻辑（读取 → 计算 → 扣减 → 写回）在 Redis 服务端原子执行，避免竞态条件。单次网络往返，性能最优。
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</Item>
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<Item title="关键逻辑">
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**初始化**：首次访问设满桶令牌。**补充**：按时间差 × 速率补充，上限为 burst。**扣减**：请求到达时 tokens - 1，不足则拒绝。
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</Item>
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</v-clicks>
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---
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# 限流中间件集成
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Gin 中间件 + 统一错误格式
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<Item title="中间件签名">
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`func RateLimit(limiter Limiter, keyFunc func(c *gin.Context) string) gin.HandlerFunc` — 可配置的 key 提取函数，支持按用户ID、IP、端点等维度限流。
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</Item>
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<Item title="注册方式">
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- **用户级**：auth 路由组，key = userID，保护个人配额
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- **全局级**：`/generate` 端点，key = endpoint，保护总容量
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</Item>
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<Item title="响应规范">
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- 通过：设置 `X-RateLimit-Remaining` 头
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- 拒绝：HTTP 429 + `Retry-After` 头 + 统一 JSON 错误体
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</Item>
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