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Abstract

This code snippet fetches a currency conversion rate.

Logic

Initialize a new HTTPBuilder, use the common request types and get snippet is a specialization of the Code snippet to make an HTTP call and request data. It accesses a REST API, and thus requests JSON data and returns the parsed data through a Groovy script written in the Groovy editor of the add-on.

Logic

• Import the HTTPBuilder, GET request methods and the JSON content type method.
• Access the REST API by creating a new HTTP instance.
• Request the JSON data passing the method as GET, the content type as JSON, and the request configuration closure to the request method.
• Return the parsed JSON data from the response.

Snippet 

import groovyx.net.http.HTTPBuilder
import static groovyx.net.http.Method.GET
import static groovyx.net.http.ContentType.JSON
 
// initialize a new builder and give a default URL
def http = new HTTPBuilder("<URL>")
 
def data = http.request(GET,JSON) { req ->
 
  response.success = { resp, readerjsonData ->
    assert resp.status == 200
	return jsonData
  reader.<id>.val
  }
 
  // called only for a 404 (not found) status code:
  response.'"404'" = { resp ->
    println 'log.error ("Not found'")
    return null
  }
}

if (data) {
  // do something with the returned data
}

Placeholders

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Example

The outcome of the code snippet is a BigDecimalJSON data. You You could use this code, for example, to convert currency from one to another.get a specific currency conversion rate.

import groovyx.net.http.HTTPBuilder
import static groovyx.net.http.Method.GET
import static groovyx.net.http.ContentType.JSON
 
// initialize a new builder and give a default URL
def http = new HTTPBuilder("http://free.currencyconverterapi.com/api/v5/convert?q=EUR_USD&compact=y")
 
return http.request(GET,JSON) { req ->
 
  response.success = { resp, jsonData ->
    assert resp.status == 200
    if(jsonData){
      return jsonData.get("EUR_USD").val
    }
    else{
      log.warn("No data returned")
      return null
    }
  }
 
  // called only for a 404 (not found) status code:
  response."404" = { resp ->
    log.error ("Not found")
	return null

  }
}

Reference

• HTTPBuilder
• Groovy Documentation

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