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serverless.md

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Summary

Name

There are two plug-ins for serverless, namely serverless-pre-function and serverless-post-function.

The former runs at the beginning of the specified phase, while the latter runs at the end of the specified phase.

Both plug-ins receive the same parameters.

Attributes

Name Type Requirement Default Valid Description
phase string optional ["access"] ["rewrite", "access", "header_filter", "body_filter", "log", "balancer"]
functions array[string] required A list of functions that are specified to run is an array type, which can contain either one function or multiple functions, executed sequentially.

Note that only function is accepted here, not other types of Lua code. For example, anonymous functions are legal:

return function()
    ngx.log(ngx.ERR, 'one')
end

Closure is also legal:

local count = 1
return function()
    count = count + 1
    ngx.say(count)
end

But code that is not a function type is illegal:

local count = 1
ngx.say(count)

How To Enable

Here's an example, enable the serverless plugin on the specified route:

curl -i http://127.0.0.1:9080/apisix/admin/routes/1  -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "uri": "/index.html",
    "plugins": {
        "serverless-pre-function": {
            "phase": "rewrite",
            "functions" : ["return function() ngx.log(ngx.ERR, \"serverless pre function\"); end"]
        }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "39.97.63.215:80": 1
        }
    }
}'

Test Plugin

Use curl to access:

curl -i http://127.0.0.1:9080/index.html

Then you will find the message 'serverless pre-function' in the error.log, which indicates that the specified function is in effect.

Disable Plugin

When you want to disable the serverless plugin, it is very simple, you can delete the corresponding json configuration in the plugin configuration, no need to restart the service, it will take effect immediately:

curl http://127.0.0.1:9080/apisix/admin/routes/1  -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "methods": ["GET"],
    "uri": "/index.html",
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "39.97.63.215:80": 1
        }
    }
}'

The serverless plugin has been disabled now. It works for other plugins.