tzssangglass / lua-resty-radixtree

Adaptive Radix Trees implemented in Lua / LuaJIT

Table of Contents

• Table of Contents
  • Name
  • Synopsis
  • Methods
    • new
    • Path
      • Full path match
      • Prefix match
      • Parameters in path
    • match
    • dispatch
  • Install
    • Compile and install
  • DEV ENV
    • Install Dependencies
  • Benchmark

Name

This is Lua implementation library base on FFI for rax.

This project depends on lua-resty-ipmatcher and lua-resty-expr.

This project has been working in microservices API gateway Apache APISIX.

The project is open sourced by Shenzhen ZhiLiu Technology Co., Ltd.

In addition to this open source version, our company also provides a more powerful and performing commercial version, and provides technical support. If you are interested in our commercial version, please contact us.

Synopsis

 location / {
     content_by_lua_block {
        local radix = require("resty.radixtree")
        local rx = radix.new({
            {
                paths = {"/aa", "/bb*", "/name/:name/*other"},
                hosts = {"*.bar.com", "foo.com"},
                methods = {"GET", "POST", "PUT"},
                remote_addrs = {"127.0.0.1","192.168.0.0/16",
                                "::1", "fe80::/32"},
                vars = {
                    {"arg_name", "==", "json"},
                    {"arg_weight", ">", 10},
                },
                filter_fun = function(vars, opts)
                    return vars["arg_name"] == "json"
                end,

                metadata = "metadata /bb",
            }
        })

        -- try to match
        local opts = {
            host = "foo.com",
            method = "GET",
            remote_addr = "127.0.0.1",
            vars = ngx.var,
        }
        ngx.say(rx:match("/aa", opts))

        -- try to match and store the cached value
        local opts = {
            host = "foo.com",
            method = "GET",
            remote_addr = "127.0.0.1",
            vars = ngx.var,
            matched = {}
        }
        ngx.say(rx:match("/name/json/foo/bar/gloo", opts))
        ngx.say("name: ", opts.matched.name, " other: ", opts.matched.other)
     }
 }

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Methods

new

syntax: rx, err = radix.new(routes, opts)

The routes is an array table, like { {...}, {...}, {...} }, Each element in the array is a route, which is a hash table.

The attributes of each element may contain these:

name	option	description	example
paths	required	A list of client request path. The default is a full match, but if the end of the path is *, it means that this is a prefix path. For example /foo*, it'll match /foo/bar or /foo/glo/grey etc.	{"/", "/aa", "/bb"}
hosts	option	A list of client request host, not only supports normal domain name, but also supports wildcard name.	{"foo.com", "*.bar.com"}
remote_addrs	option	A list of client remote address(IPv4 and IPv6), and we can use CIDR format, eg 192.168.1.0/24.	{"127.0.0.1", "192.0.0.0/8", "::1", "fe80::/32"}
methods	option	A list of method name. Here is full valid method list: "GET", "POST", "PUT", "DELETE", "PATCH", "HEAD", "OPTIONS", "CONNECT" and "TRACE".	{"GET", "POST"}
vars	option	A DSL to evaluate with the given opts.vars or ngx.var. See https://github.com/api7/lua-resty-expr#new	{{"arg_name", "==", "json"}, {"arg_age", ">", 18}}
filter_fun	option	User defined filter function, We can use it to achieve matching logic for special scenes. radixtree will pass vars and other arguments when matching route.	function(vars) return vars["arg_name"] == "json" end
priority	option	Routing priority, default is 0.	priority = 100
metadata	option	Will return this field if using rx:match to match route.
handler	option	Will call this function using rx:dispatch to match route.

The opts is an optional configuration controls the behavior of match. Fields below are supported:

name	description	default
no_param_match	disable Parameters in path	false

Path

Full path match

local rx = radix.new({
    {
        paths = {"/aa", "/bb/cc", "/dd/ee/index.html"},
        metadata = "metadata /aa",
    },
    {
        paths = {"/gg"},
        metadata = "metadata /gg",
    },
    {
        paths = {"/index.html"},
        metadata = "metadata /index.html",
    },
})

Full path matching, allowing multiple paths to be specified at the same time.

Prefix match

local rx = radix.new({
    {
        paths = {"/aa/*", "/bb/cc/*"},
        metadata = "metadata /aa",
    },
    {
        paths = {"/gg/*"},
        metadata = "metadata /gg",
    },
})

Path prefix matching, allowing multiple paths to be specified at the same time.

Parameters in path

local rx = radix.new({
    {
        -- This handler will match /user/john but will not match /user/ or /user
        paths = {"/user/:user"},
        metadata = "metadata /user",
    },
    {
        -- However, this one will match /user/john/ and also /user/john/send/data
        paths = {"/user/:user/*action"},
        metadata = "metadata action",
    },
})

match

syntax: metadata = rx:match(path, opts)

• path: client request path.
• opts: a Lua table (optional).
  • method: optional, method name of client request.
  • host: optional, client request host.
  • remote_addr: optional, client remote address like 192.168.1.100.
  • paths: optional, a list of client request path.
  • vars: optional, a Lua table to fetch variable, default value is ngx.var to fetch Nginx builtin variable.

Matches the route by method, path and host etc, and return metadata if successful.

local metadata = rx:match(ngx.var.uri, {...})

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dispatch

syntax: ok = rx:dispatch(path, opts, ...)

• path: client request path.
• opts: a Lua table (optional).
  • method: optional, method name of client request.
  • host: optional, client request host.
  • remote_addr: optional, client remote address like 192.168.1.100.
  • vars: optional, a Lua table to fetch variable, default value is ngx.var to fetch Nginx builtin variable.

Matches the route by method, path and host etc, and call handler function if successful.

local ok = rx:dispatch(ngx.var.uri, {...})

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Install

Compile and install

make install

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DEV ENV

Install Dependencies

make deps

Benchmark

We wrote some simple benchmark scripts. Machine environment: MacBook Pro (16-inch, 2019), CPU 2.3 GHz Intel Core i9.

$ make
cc -O2 -g -Wall -fpic -std=c99 -Wno-pointer-to-int-cast -Wno-int-to-pointer-cast -DBUILDING_SO -c src/rax.c -o src/rax.o
cc -O2 -g -Wall -fpic -std=c99 -Wno-pointer-to-int-cast -Wno-int-to-pointer-cast -DBUILDING_SO -c src/easy_rax.c -o src/easy_rax.o
cc -shared -fvisibility=hidden src/rax.o src/easy_rax.o -o librestyradixtree.so

$ make bench
resty -I=./lib -I=./deps/share/lua/5.1 benchmark/match-parameter.lua
matched res: 1
route count: 100000
match times: 10000000
time used  : 3.1400001049042 sec
QPS        : 3184713
each time  : 0.31400001049042 ns

resty -I=./lib -I=./deps/share/lua/5.1 benchmark/match-prefix.lua
matched res: 500
route count: 100000
match times: 1000000
time used  : 0.42700004577637 sec
QPS        : 2341920

resty -I=./lib -I=./deps/share/lua/5.1 benchmark/match-static.lua
matched res: 500
route count: 100000
match times: 10000000
time used  : 0.95000004768372 sec
QPS        : 10526315

resty -I=./lib -I=./deps/share/lua/5.1 benchmark/match-hosts.lua
matched res: 500
route count: 1000
match times: 100000
time used  : 0.60199999809265 sec
QPS        : 166112

resty -I=./lib -I=./deps/share/lua/5.1 benchmark/match-wildcard-hosts.lua
matched res: 500
route count: 1000
match times: 50000
time used  : 0.47900009155273 sec
QPS        : 104384

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