I'm trying to develop an ab-test plugin, how to implement it?

[membphis]

Hi, I'm trying to develop an ab-test plugin and it will be used for the backend API's URI or params control. The configuration below is my simple design. I'm not sure whether it is a generic feature. Looking forward to your suggestion.

{
    "ab-test-rewrite": {
        "enabled": true,
        "default": {
            "uri": "/test/home.html",
            "scheme": "http",
            "host": "iresty.com",
            "headers": {
                "X-Api-Version": "v1",
                "X-Api-Engine": "apisix",
                "X-Api-useless": ""
            }
        },
        "tests": [
            {
                "condition": [
                    {
                        "proccessor": "mod|7",
                        "field": "userid",
                        "range": "0,4"
                    }
                ],
                "rewrite": {
                    "uri": "/test?group_id=234"
                }
            },
            {
                "condition": [
                    {
                        "proccessor": "mod|7",
                        "field": "userid",
                        "range": "5,6"
                    }
                ],
                "rewrite": {
                    "uri": "/test?group_id=83838"
                }
            }
        ]
    }
}

[membphis]

You can make a try with this way:

curl -i http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -d '
{
    "uri": "/index.html",
    "filter_func": "function(vars) return vars.arg_id and (vars.arg_id % 7 <= 4) end",
    "plugins": {
        "redirect": {
            "uri": "/test?group_id=234"
        }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "39.97.63.215:80": 1
        }
    }
}'


curl -i http://127.0.0.1:9080/apisix/admin/routes/2 -X PUT -d '
{
    "uri": "/index.html",
    "filter_func": "function(vars) return vars.arg_id and (vars.arg_id % 7 > 4) end",
    "plugins": {
        "redirect": {
            "uri": "/test?group_id=83838"
        }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "39.97.63.215:80": 1
        }
    }
}'

[membphis]

Better way: we can support more operator like mod for lua-resty-radixtree.

Here is the operator list of current:
https://github.com/iresty/lua-resty-radixtree#operator-list

It may be like this:

curl -i http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -d '
{
    "uri": "/index.html",
    "vars": [
        {"arg_id", "%", "7", "<=", 4}
    ]
    "plugins": {
        "redirect": {
            "uri": "/test?group_id=234"
        }
    }
}'

[Beckjiang]

This way basically can solve my problem and is graceful. I will think about it.

[membphis]

feel happy to help you.

[soulsoul]

i think we should implement a rule engine .we can compute by the express. like >, <, mod etc.

[membphis]

i think we should implement a rule engine .we can compute by the express. like >, <, mod etc.

#841 (comment)

how about this way?

[moonming]

we can add doc and examples for the powerful route

[soulsoul]

i think we should implement a rule engine .we can compute by the express. like >, <, mod etc.

#841 (comment)

how about this way?

i like this, but is the support limited?

[membphis]

i like this, but is the support limited?

"vars": [
        {"arg_id", "%", "7", "<=", 4}
    ]

it means: ngx.var.arg_id % 7 <= 4. I create a new issue: api7/lua-resty-radixtree#32 , lua-resty-radixtree not support operator % now.

[moonming]

I think we should write this into doc.

[membphis]

I think we should write this into doc.

This is still a todo thing.