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77 lines
1.7 KiB
Markdown
77 lines
1.7 KiB
Markdown
# libradixtree
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### what's libradixtree?
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[libradixtree](https://github.com/iresty/lua-resty-radixtree), adaptive radix trees implemented in Lua for OpenResty.
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APISIX using libradixtree as route dispatching library.
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### How to use libradixtree in APISIX?
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This is Lua-Openresty implementation library base on FFI for [rax](https://github.com/antirez/rax).
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Let's take a look at a few examples and have an intuitive understanding.
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#### 1. Full match
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```
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/blog/foo
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```
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It will only match `/blog/foo`.
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#### 2. Prefix matching
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```
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/blog/bar*
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```
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It will match the path with the prefix `/blog/bar`, eg: `/blog/bar/a`,
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`/blog/bar/b`, `/blog/bar/c/d/e`, `/blog/bar` etc.
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#### 3. Match priority
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Full match -> Deep prefix matching.
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Here are the rules:
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```
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/blog/foo/*
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/blog/foo/a/*
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/blog/foo/c/*
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/blog/foo/bar
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```
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| path | Match result |
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|------|--------------|
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|/blog/foo/bar | `/blog/foo/bar` |
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|/blog/foo/a/b/c | `/blog/foo/a/*` |
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|/blog/foo/c/d | `/blog/foo/c/*` |
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|/blog/foo/gloo | `/blog/foo/*` |
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|/blog/bar | not match |
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### How to filter route by Nginx builtin variable
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Please take a look at [radixtree-new](https://github.com/iresty/lua-resty-radixtree#new),
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here is an simple example:
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```shell
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$ curl http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -i -d '
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{
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"uri": "/index.html",
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"vars": [
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["http_host", "iresty.com"],
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["cookie__device_id", "a66f0cdc4ba2df8c096f74c9110163a9"],
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["arg_name", "jack"]
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],
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"upstream": {
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"type": "roundrobin",
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"nodes": {
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"39.97.63.215:80": 1
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}
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}
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}'
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```
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This route will require the request header `host` equal `iresty.com`, request cookie key `_device_id` equal `a66f0cdc4ba2df8c096f74c9110163a9` etc.
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