Using Function Parameters

Receiving parameters in Function

Function can receive parameters and use them.

• Python
• Java

Python

You can receive parameters from main function arguments (params). The type of params is a dictionary.

def main(params):
    name = params.get('name', 'stranger')
    age = params.get('age', 0)
    return params

Java

You can receive parameters from main function arguments (params). The type of params is com.google.gson.JsonObject.

import com.google.gson.JsonObject;

public class Main {
    public static JsonObject main(JsonObject params) {
        String name = "stranger";
        int age = 0;
        if(params.has("name")) {
           name = params.getAsJsonPrimitive("name").getAsString();
        }
        if(params.has("age")) {
           age = params.getAsJsonPrimitive("age").getAsInt();
        }
        return params;
    }
}

Pass parameters to Function

There are two ways to pass parameters to Function.

1. Pass when creating Function via Meteoroid CLI
2. Pass when calling Function via RESTful API

1. Pass when creating Function via Meteoroid CLI

When creating a Function, you can pass parameters to the Function by using the -p option. This method is suitable for parameters that do not change dynamically with each request.

meteoroid function create function1 function1.py -p name FIWARE -p age 23

2. Pass when calling Function via RESTful API

Parameters can be specified even if they are not defined when creating a Function. Also, the parameters specified when creating the Function can be updated.

When using cURL, you can pass parameters as follows:

curl -X POST http://192.168.29.56:9090/api/23bc46b1-71f6-4ed5-8c54-816aa4f8c502/endpoint1/function1 \
    -d timeout=60 \
    -d age=21