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granian,一个强悍的 Python 库

  • 2026-03-27 18:00:15
granian,一个强悍的 Python 库

大家好,我是木木。

今天给大家分享一个【强悍】的 Python 库,granian

granian 是一个用 Rust 编写的 Python HTTP 服务器,基于 Hyper 和 Tokio 构建。它用单一依赖替代了传统的 Gunicorn + Uvicorn + http-tools 组合,同时支持 ASGI、RSGI、WSGI 三种应用接口,并原生支持 HTTP/2 和 WebSocket。

对于追求高性能和高并发的 Python Web 应用来说,granian 是一个值得关注的部署选择。

项目地址:https://github.com/emmett-framework/granian

特点一:三位一体的接口支持

granian 最大的亮点是同时支持 ASGI、RSGI 和 WSGI 三种协议,开发者无需更换应用层代码,只需切换启动参数即可切换协议。以下示例展示同一个简单应用如何分别以 ASGI 和 RSGI 接口启动:

# app.pyasyncdefapp(scope,receive,send):assertscope['type']=='http'awaitsend({'type':'http.response.start','status':200,'headers':[[b'content-type',b'text/plain']],})awaitsend({'type':'http.response.body','body':b'Hello from granian!',})

ASGI 接口启动命令如下,RSGI 接口只需换参数即可无缝切换:

granian--interfaceasgiapp:app--host0.0.0.0--port8000

WSGI 应用(同步 Flask/Django)同样一行切换,无需额外中间件组合:

granian--interfacewsgimyflaskapp:app

这种灵活性在迁移或对比测试不同协议时非常有用,不需要拆掉一套服务器再搭另一套。

特点二:Rust 引擎带来的性能优势

granian 的核心 HTTP 处理全部在 Rust 层完成,利用 Tokio 异步运行时处理高并发 I/O。granian 的并发控制通过 backpressure 机制实现,在 accept loop 层面限制每个 worker 的最大并发连接数,防止后端过载:

granian--backpressure512myapp:app

backpressure 值需要根据应用特性调优:I/O 密集型应用(如调用外部 API、数据库查询)可以设置较高值;而 CPU 密集型应用由于 GIL 限制,高并发反而可能降低吞吐量,应设置较低值以获得更好的实际吞吐。

特点三:开箱即用的 HTTP/2 和 WebSocket

granian 原生支持 HTTP/2,启用方式极为简单:

granian--http2myasgiapp:app

对于需要长连接和双向通信的场景,WebSocket 支持也已内置,默认开启。HTTP/2 的多路复用特性特别适合微服务架构中的内部通信场景,相比 HTTP/1.1 的序列化管理可以显著降低连接开销。

最佳实践

安装方式

pipinstallgranian

根据需要安装额外依赖:

pipinstallgranian[pname]# 支持进程命名pipinstallgranian[reload]# 开发环境自动重载pipinstallgranian[uvloop]# Linux/macOS 加速

基础 ASGI 服务

以下示例展示用 FastAPI 构建一个简单的 REST 接口,并通过 granian 高性能部署:

# main.pyfromfastapiimportFastAPIapp=FastAPI()@app.get("/hello/{name}")defhello(name:str):return{"message":f"Hello, {name}!"}@app.get("/health")defhealth():return{"status":"ok"}
granian--interfaceasgimain:app--host0.0.0.0--port8000--workers4

静态文件服务

granian 支持直接托管静态文件,无需额外中间件:

granian\--static-path-route/static\--static-path-mount./assets/static\--static-path-expires3600\myapp:app

高级功能:Prometheus 监控指标

granian 内置 Prometheus 格式的运行时指标导出,方便接入现有监控体系:

granian--metrics--metrics-port9090myapp:app

主要可用指标包括:

  • granian_workers_spawns:worker 启动次数
  • granian_connections_active:当前活跃连接数
  • granian_connections_handled:已处理的连接总数
  • granian_blocking_threads:当前阻塞线程池大小
  • granian_py_wait_cumulative:Python GIL 等待累计时间(free-threaded 构建恒为 0)

通过 Grafana 配合 Prometheus 抓取这些指标,可以直观掌握服务吞吐瓶颈和资源使用情况。

环境与版本信息

  • Python:3.8 及以上
  • Granian:2.7.2(当前安装版本)
  • 操作系统:Linux(推荐)、macOS、Windows
  • Rust:granian 内置 Rust 运行时,无需单独安装
  • 关键依赖:Hyper(Rust HTTP 库)、Tokio(Rust 异步运行时)

适用

  • 需要高性能 HTTP/2 服务的 Python Web 应用
  • 想用单一依赖替代 Gunicorn + Uvicorn + http-tools 组合
  • 对并发连接数有精确控制需求的生产环境
  • 微服务架构中需要统一通信层的企业场景

不适用

  • 需要纯 Python 实现的场景(granian 核心为 Rust)
  • 依赖 trio 或 gevent 的异步框架
  • 需要高级调试工具(如 Django Debug Toolbar)的开发阶段
  • ASGI 扩展尚未完全覆盖的高级功能场景

上线检查

  1. 确认应用在目标协议(ASGI/WSGI/RSGI)下通过功能测试
  2. 使用 ab 或 wrk 进行基准压测,验证 backpressure 值是否需要调优
  3. 确认 Prometheus 指标能正常抓取,核心指标无异常峰值

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  1. 请求信息 : 2026-03-28 02:23:56 HTTP/2.0 GET : https://f.mffb.com.cn/a/483384.html
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  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=c530715a351861c70011cff32d0176ce
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  1. CONNECT:[ UseTime:0.000569s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000720s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000312s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000302s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000520s ]
  6. SELECT * FROM `set` [ RunTime:0.000244s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000567s ]
  8. SELECT * FROM `article` WHERE `id` = 483384 LIMIT 1 [ RunTime:0.004880s ]
  9. UPDATE `article` SET `lasttime` = 1774635836 WHERE `id` = 483384 [ RunTime:0.013054s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000288s ]
  11. SELECT * FROM `article` WHERE `id` < 483384 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000475s ]
  12. SELECT * FROM `article` WHERE `id` > 483384 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000533s ]
  13. SELECT * FROM `article` WHERE `id` < 483384 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003700s ]
  14. SELECT * FROM `article` WHERE `id` < 483384 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001090s ]
  15. SELECT * FROM `article` WHERE `id` < 483384 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001651s ]
0.095365s