OpenResty and API Gateway Learning Guide

Discussion topics include machines, languages, and architectures such as reactor, coroutine, and cache.

Learning Guide #1

Reactor – http://blog.csdn.net/u013074465/article/details/46276967

Coroutine – http://blog.csdn.net/wyx819/article/details/45420017

Tornado IOLoop code reading notes – http://t.cn/R5XxpMM

Synchronous Programming

Multithreading, user‑mode/kernel‑mode switching

Blocking leads to thread switching

Asynchronous Programming

Event‑driven model

Callbacks

Coroutines

OpenResty

Nginx

lua‑nginx‑module

lua resty libraries – https://github.com/iresty/nginx-lua-module-zh-wiki#description

ngx_lua module principles

Each worker creates a Lua VM; all coroutines in the worker share the VM.

Nginx I/O primitives are wrapped and injected into the Lua VM, allowing direct Lua access.

Each external request is handled by a Lua coroutine, providing data isolation between coroutines.

When Lua code calls asynchronous I/O, the current coroutine is suspended without blocking the worker.

Upon I/O completion, the coroutine context is restored and execution resumes.

Learning Guide #2

OpenResty series course – http://www.stuq.org/course/1015

Agentzh Nginx tutorial – https://openresty.org/download/agentzh-nginx-tutorials-zhcn.html

OpenResty best practices – https://moonbingbing.gitbooks.io/openresty-best-practices/content/

nginx‑lua‑module‑zh‑wiki – https://github.com/iresty/nginx-lua-module-zh-wiki

API Gateway

Microservices

Entry point

Authorization, monitoring, load balancing, caching, request sharding, static response handling

Learning Guide #3

Microservices – http://blog.csdn.net/wurenhai/article/details/37659335/

API Gateway – http://dockone.io/article/482

Kong

Based on OpenResty

Provides a rich plugin ecosystem

Highly customizable plugins

Learning Guide #4

Kong source analysis – http://cyukang.com/2017/07/02/kong-intro.html

Deep dive into orange – https://github.com/linger1216/understanding-orange

Custom Requirements

eebo auth – independent auth module, flexible API auth configuration, Python services need not handle authentication details.

eebo limiting – built‑in rate limiting with company_id/user_id dimensions.

eebo balancer – private service provision with powerful distributed distribution.

Built‑in Plugins

CORS – handles cross‑origin requests.

IP Restriction – IP whitelist/blacklist.

Correlation ID – generates a unique request ID for each request, aiding tracing and logging.

Syslog – forwards logs to Syslog.

Source: https://zhu327.github.io/2017/11/27/openresty%E4%B8%8Eapi-gateway/

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