feat(apisix): add Cloudron package

- Implements Apache APISIX packaging for Cloudron platform.
- Includes Dockerfile, CloudronManifest.json, and start.sh.
- Configured to use Cloudron's etcd addon.

🤖 Generated with Gemini CLI
Co-Authored-By: Gemini <noreply@google.com>
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---
Title: Router Radixtree
---
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### What is Libradixtree?
[Libradixtree](https://github.com/api7/lua-resty-radixtree) is an adaptive radix tree that is implemented in Lua for OpenResty and it is based on FFI for [rax](https://github.com/antirez/rax). APISIX uses libradixtree as a route dispatching library.
### How to use Libradixtree in APISIX?
There are several ways to use Libradixtree in APISIX. Let's take a look at a few examples and have an intuitive understanding.
#### 1. Full match
```
/blog/foo
```
It will only match the full path `/blog/foo`.
#### 2. Prefix matching
```
/blog/bar*
```
It will match the path with the prefix `/blog/bar`. For example, `/blog/bar/a`,
`/blog/bar/b`, `/blog/bar/c/d/e`, `/blog/bar` etc.
#### 3. Match priority
Full match has a higher priority than deep prefix matching.
Here are the rules:
```
/blog/foo/*
/blog/foo/a/*
/blog/foo/c/*
/blog/foo/bar
```
| path | Match result |
|------|--------------|
|/blog/foo/bar | `/blog/foo/bar` |
|/blog/foo/a/b/c | `/blog/foo/a/*` |
|/blog/foo/c/d | `/blog/foo/c/*` |
|/blog/foo/gloo | `/blog/foo/*` |
|/blog/bar | not match |
#### 4. Different routes have the same `uri`
When different routes have the same `uri`, you can set the priority field of the route to determine which route to match first, or add other matching rules to distinguish different routes.
Note: In the matching rules, the `priority` field takes precedence over other rules except `uri`.
1. Different routes have the same `uri` but different `priority` field
Create two routes with different `priority` values (the larger the value, the higher the priority).
:::note
You can fetch the `admin_key` from `config.yaml` and save to an environment variable with the following command:
```bash
admin_key=$(yq '.deployment.admin.admin_key[0].key' conf/config.yaml | sed 's/"//g')
```
:::
```shell
$ curl http://127.0.0.1:9180/apisix/admin/routes/1 -H "X-API-KEY: $admin_key" -X PUT -d '
{
"upstream": {
"nodes": {
"127.0.0.1:1980": 1
},
"type": "roundrobin"
},
"priority": 3,
"uri": "/hello"
}'
```
```shell
$ curl http://127.0.0.1:9180/apisix/admin/routes/2 -H "X-API-KEY: $admin_key" -X PUT -d '
{
"upstream": {
"nodes": {
"127.0.0.1:1981": 1
},
"type": "roundrobin"
},
"priority": 2,
"uri": "/hello"
}'
```
Test:
```shell
curl http://127.0.0.1:1980/hello
1980
```
All requests will only hit the route of port `1980` because it has a priority of 3 while the route with the port of `1981` has a priority of 2.
2. Different routes have the same `uri` but different matching conditions
To understand this, look at the example of setting host matching rules:
```shell
$ curl http://127.0.0.1:9180/apisix/admin/routes/1 -H "X-API-KEY: $admin_key" -X PUT -d '
{
"upstream": {
"nodes": {
"127.0.0.1:1980": 1
},
"type": "roundrobin"
},
"hosts": ["localhost.com"],
"uri": "/hello"
}'
```
```shell
$ curl http://127.0.0.1:9180/apisix/admin/routes/2 -H "X-API-KEY: $admin_key" -X PUT -d '
{
"upstream": {
"nodes": {
"127.0.0.1:1981": 1
},
"type": "roundrobin"
},
"hosts": ["test.com"],
"uri": "/hello"
}'
```
Test:
```shell
$ curl http://127.0.0.1:9080/hello -H 'host: localhost.com'
1980
```
```shell
$ curl http://127.0.0.1:9080/hello -H 'host: test.com'
1981
```
```shell
$ curl http://127.0.0.1:9080/hello
{"error_msg":"404 Route Not Found"}
```
If the `host` rule matches, the request hits the corresponding upstream, and if the `host` does not match, the request returns a 404 message.
#### 5. Parameter match
When `radixtree_uri_with_parameter` is used, we can match routes with parameters.
For example, with configuration:
```yaml
apisix:
router:
http: 'radixtree_uri_with_parameter'
```
route like
```
/blog/:name
```
will match both `/blog/dog` and `/blog/cat`.
For more details, see https://github.com/api7/lua-resty-radixtree/#parameters-in-path.
### How to filter route by Nginx built-in variable?
Nginx provides a variety of built-in variables that can be used to filter routes based on certain criteria. Here is an example of how to filter routes by Nginx built-in variables:
```shell
$ curl http://127.0.0.1:9180/apisix/admin/routes/1 -H "X-API-KEY: $admin_key" -X PUT -i -d '
{
"uri": "/index.html",
"vars": [
["http_host", "==", "iresty.com"],
["cookie_device_id", "==", "a66f0cdc4ba2df8c096f74c9110163a9"],
["arg_name", "==", "json"],
["arg_age", ">", "18"],
["arg_address", "~~", "China.*"]
],
"upstream": {
"type": "roundrobin",
"nodes": {
"127.0.0.1:1980": 1
}
}
}'
```
This route will require the request header `host` equal `iresty.com`, request cookie key `_device_id` equal `a66f0cdc4ba2df8c096f74c9110163a9` etc. You can learn more at [radixtree-new](https://github.com/api7/lua-resty-radixtree#new).
### How to filter route by POST form attributes?
APISIX supports filtering route by POST form attributes with `Content-Type` = `application/x-www-form-urlencoded`.
We can define the following route:
```shell
$ curl http://127.0.0.1:9180/apisix/admin/routes/1 -H "X-API-KEY: $admin_key" -X PUT -i -d '
{
"methods": ["POST", "GET"],
"uri": "/_post",
"vars": [
["post_arg_name", "==", "json"]
],
"upstream": {
"type": "roundrobin",
"nodes": {
"127.0.0.1:1980": 1
}
}
}'
```
The route will be matched when the POST form contains `name=json`.
### How to filter route by GraphQL attributes?
APISIX can handle HTTP GET and POST methods. At the same time, the request body can be a GraphQL query string or JSON-formatted content.
APISIX supports filtering routes by some attributes of GraphQL. Currently, we support:
* graphql_operation
* graphql_name
* graphql_root_fields
For instance, with GraphQL like this:
```graphql
query getRepo {
owner {
name
}
repo {
created
}
}
```
Where
* The `graphql_operation` is `query`
* The `graphql_name` is `getRepo`,
* The `graphql_root_fields` is `["owner", "repo"]`
We can filter such route with:
```shell
$ curl http://127.0.0.1:9180/apisix/admin/routes/1 -H "X-API-KEY: $admin_key" -X PUT -i -d '
{
"methods": ["POST", "GET"],
"uri": "/graphql",
"vars": [
["graphql_operation", "==", "query"],
["graphql_name", "==", "getRepo"],
["graphql_root_fields", "has", "owner"]
],
"upstream": {
"type": "roundrobin",
"nodes": {
"127.0.0.1:1980": 1
}
}
}'
```
We can verify GraphQL matches in the following three ways:
1. GraphQL query strings
```shell
$ curl -H 'content-type: application/graphql' -X POST http://127.0.0.1:9080/graphql -d '
query getRepo {
owner {
name
}
repo {
created
}
}'
```
2. JSON format
```shell
$ curl -H 'content-type: application/json' -X POST \
http://127.0.0.1:9080/graphql --data '{"query": "query getRepo { owner {name } repo {created}}"}'
```
3. Try `GET` request match
```shell
$ curl -H 'content-type: application/graphql' -X GET \
"http://127.0.0.1:9080/graphql?query=query getRepo { owner {name } repo {created}}" -g
```
To prevent spending too much time reading invalid GraphQL request body, we only read the first 1 MiB
data from the request body. This limitation is configured via:
```yaml
graphql:
max_size: 1048576
```
If you need to pass a GraphQL body which is larger than the limitation, you can increase the value in `conf/config.yaml`.
### How to filter route by POST request JSON body?
APISIX supports filtering route by POST form attributes with `Content-Type` = `application/json`.
We can define the following route:
```shell
$ curl http://127.0.0.1:9180/apisix/admin/routes/1 -H "X-API-KEY: $admin_key" -X PUT -i -d '
{
"methods": ["POST"],
"uri": "/_post",
"vars": [
["post_arg.name", "==", "xyz"]
],
"upstream": {
"type": "roundrobin",
"nodes": {
"127.0.0.1:1980": 1
}
}
}'
```
It will match the following POST request
```shell
curl -X POST http://127.0.0.1:9180/_post \
-H "Content-Type: application/json" \
-d '{"name":"xyz"}'
```
We can also filter by complex queries like the example below:
```shell
$ curl http://127.0.0.1:9180/apisix/admin/routes/1 -H "X-API-KEY: $admin_key" -X PUT -i -d '
{
"methods": ["POST"],
"uri": "/_post",
"vars": [
["post_arg.messages[*].content[*].type","has","image_url"]
],
"upstream": {
"type": "roundrobin",
"nodes": {
"127.0.0.1:1980": 1
}
}
}'
```
It will match the following POST request
```shell
curl -X POST http://127.0.0.1:9180/_post \
-H "Content-Type: application/json" \
-d '{
"model": "deepseek",
"messages": [
{
"role": "system",
"content": [
{
"text": "You are a mathematician",
"type": "text"
},
{
"text": "You are a mathematician",
"type": "image_url"
}
]
}
]
}'
```