Develop Reference

How to pass event parameters to AWS Lambda function using API Gateway?

I have an AWS Lambda function written in python that is initiated by a Zapier trigger that I set up. As I pass some input parameters to the function in the Zapier trigger, I can access to the input parameters in my python code by using variables such as event[parameter1]. It perfectly works.
I'm trying to access the same Lambda function in Airtable Scripting environment. In order to do it, I set up an API Gateway trigger for the Lambda function, but I can't figure out how to pass input parameters in the vanilla JS environment. Below is the code that I have, which gives me "Internal Server Error".
Your help would be definitely appreciated!
const awsUrl = "https://random-id.execute-api.us-west-2.amazonaws.com/default/lambda-function";
let event = {
"queryStringParameters": {
"gdrive_folder_id": consFolderId,
"invitee_email": email
}
};
let response = await fetch(awsUrl, {
method: "POST",
body: JSON.stringify(event),
headers: {
"Content-Type": "application/json",
}
});
console.log(await response.json());
[Edited] Plus, here's the code of the Lambda function and the latest cloudwatch log after a successful execution invoked by Zapier. It's a simple code that automates Google Drive folder sharing based on 2 inputs. (Folder ID + email address) Please bear with me for the poor code quality!
from __future__ import print_function
from googleapiclient.discovery import build
from google.oauth2 import service_account
SCOPES = ['https://www.googleapis.com/auth/drive']
SERVICE_ACCOUNT_FILE = 'service.json'
def lambda_handler(event, context):
"""Shows basic usage of the Drive v3 API.
Prints the names and ids of the first 10 files the user has access to.
"""
# 2-legged OAuth from Google service account
creds = service_account.Credentials.from_service_account_file(
SERVICE_ACCOUNT_FILE, scopes=SCOPES)
drive_service = build('drive', 'v3', credentials=creds)
# change multiple permissions with batch requests
folder_id = event['gdrive_folder_id']
email_address = event['invitee_email']
def callback(request_id, response, exception):
if exception:
# Handle error
print(exception)
else:
print("Permission Id: {}".format(response.get('id')))
batch = drive_service.new_batch_http_request(callback=callback)
user_permission = {
'type': 'user',
'role': 'writer',
'emailAddress': email_address
}
batch.add(drive_service.permissions().create(
fileId=folder_id,
body=user_permission,
fields='id',
))
batch.execute()

I'm not a Python expert and I don't know how you've setup your API Gateway integration with Lambda but I believe your code can have two issues:
1.) Internal Server Error as a response from the API Gateway endpoint also often refers to a problem in the integration between the API Gateway and your Lambda function. In this case here I can not see where you are returning a valid response back to the API Gateway. In your example the return value of batch.execute() is probably returned, right? However, by default the API Gateway expects an object that contains a statusCode and body and optionally headers. You can have a look at the AWS Lambda handler documentation for Python and their examples. Also this documentation page might be of interest for you.
2.) In your function you are accessing the event data like event['gdrive_folder_id']. However, I can not see that you are parsing the event data somewhere. Are you using a custom integration between your API Gateway? Because in case of a proxy integration the API Gateway sends an object that has a body field and from there you'd need to read the HTTP body. See examples on this documentation page.
Here are some more thing you can check on your own:
Have you also checked what you get when you just print the event data? Also, is the batch.execute() waiting for the batch processing or does it return anything? If so, what does it return?
One note here: You haven't told us anything about the integration between your API Gateway and your Lambda function. Since you can do some mapping between the API Gateway and AWS Lambda, it could be possible that you are converting the request and response outside of the Lambda function and hence, my suggestions above are wrong. Let me know if this is true or not and we can further investigate it.

How to pull data from own Flask JSON route endpoint using Axios

I would like to save JSON data into a variable using Axios in Javascript. The route that produces the JSON endpoint is my own servers route http://123.4.5.6:7890/json. This works successfully with the following function:
async function getClasses() {
const res = await axios.get('http://123.4.5.6:7890/json');
}
However, I figure this won't work with someone else's server when they pull up my project, so what line of code would go into the http:// spot? My mentor recomended using 'http://localhost:5000/json' however this error occurs when I tried this.
Here is the python code for my json route:
#app.route('/json')
def display_json():
"""view/signup for available yoga classes using API"""
serialized_classes = [c.serialize() for c in Classes.query.all()]
return jsonify(serialized_classes)
When I go to the http://123.4.5.6:7890/json route in my browser. JSON does successfully appear in the browser. Thanks, and any help is appreciated

I think it's a CORS issue, you can use the below code to solve this issue.
var config = {
headers: {'Access-Control-Allow-Origin': '*'}
};
async function getClasses() {
const res = await axios.get('http://123.4.5.6:7890/json', config);
}

on your app.py or main.py file
from flask_cors import CORS
app = Flask(__name__)
CORS(app)

GraphQL not making request to WP API

Thanks in advance!
I'm pulling data from a WP Rest API and when spin up the wordpress site on my local machine with the address http://localhost:8000 and got to the graphqli playground on http://localhost:3000/api/graphql and i enter a query i get the expected results and i can consume the data happily in react but once i change the WP rest API address to http://example.com/cms i get back an error. The only thing that changes is the URL so i'm guessing it has to do with CORS.
Inspecting the browser window there is no CORS errors so i can rule out CORS being an issue. The strange thing is that when i make the api call via postman i get the response i expect, when i type in the endpoint in a browser i get the results i expect when i use the endpoint to resolve the query request i get an error, so i started to look at the headers as thats the only thing i can see that changes between a postman request and a normal browser request. for the local wp installation # localhost:8000 looking at the logs i can see the request being made from postman and the browser and axios(used in the query resolver) on the flipside the wp installation thats live on the web the logs show the request from postman and from the browser to the api endpoint but not from the graphql resolver. how do i fix this issue with the resolver not making the request?
this is my resolver for the query
const resolvers = {
Query: {
pages: (_parent, _args, _context) => {
return axios.get(`${wpURL}/wp-json/wp/v2/pages`)
.then(res => res.data)
.catch(error => {
console.log("Response Status:", error.response.status);
console.log("Response Headers:", error.response.headers);
console.log("Response Data:", error.response.data);
});
}
}
}
graphqlserver:
import {ApolloServer} from 'apollo-server-micro'
import Cors from 'micro-cors'
import {schema} from './schema'
const cors = Cors()
const server = new ApolloServer({schema})
const handler = server.createHandler({path: '/api/graphql'})
export const config = {
api: {
bodyParser: false,
}
}
export default cors(handler)
terminal:
> next dev
ready - started server on http://localhost:3000
event - compiled successfully
event - build page: /api/graphql
wait - compiling...
event - build page: /api/graphql
event - compiled successfully
page:
What am i doing wrong?

i figured it out it looks like if the endpoint graphql is fetching data from is not secured via SSL it wont even bother asking for data

JS access to mongoengine backend

I have a model created with Mongoengine and Python but need to access this data from JS for visualization on a Flask web app. What's the best way to do this?
I know of Python Eve and eve-mongoengine but it feels like creating a rest interface just for JS access is a bit too heavy. Any other suggestions?

You don't have to make a full rest api. Just create a route that will return a JSON. Use Flask's jsonify and GET the JSON using axios, fetch, jQueryor whatever you like.
Example using axios:
# app.py
# import jsonify from Flask
...
#app.route('/data')
def return_json():
# query = you query
return jsonify(query)
Remember to add axios to you static files or use a CDN.
// main.js
var axios = require('axios');
axios.get('/data')
.then(function (response) {
// do something with your data
})
.catch(function (error) {
// handle errors, like console.log(error);
});

Sending data from JavaScript to Python function locally with AJAX

I am trying to build a website where a user can enter text, which will be picked up via javascript, and sent to a python function where it will be posted to twitter. For the time being, the python function is being stored locally, along with the rest of the site. However, my AJAX isn't too great and I'm having a few issues.
I have written AJAX code which sends a POST request to the python function with the tweet, and the response is the entire python script. No connection is made to the socket my script is listening to. Below is the AJAX function and the python script. Any ideas what's going on?
Thanks in advance for any help!
$(function(){
$('#PostTweet').on('click', function(e) {
var tweet = document.getElementById("theTweet").value;
var len = tweet.length;
if(len > 140){
window.alert("Tweet too long. Please remove some characters");
}else{
callPython(tweet);
}
});
});
function callPython(tweet){
window.alert("sending");
$.ajax({
type: "POST",
url: "tweet.py",
data: tweet,
success: function(response){
window.alert(response);
}
})
}
And the Python Script:
from OAuthSettings import settings
import twitter
from socket import *
consumer_key = settings['consumer_key']
consumer_secret = settings['consumer_secret']
access_token_key = settings['access_token_key']
access_token_secret = settings['access_token_secret']
s = socket()
s.bind(('', 9999))
s.listen(4)
(ns, na) = s.accept()
def PostToTwits(data):
try:
api = twitter.Api(
consumer_key = consumer_key,
consumer_secret = consumer_secret,
access_token_key = access_token_key,
access_token_secret = access_token_secret)
api.PostUpdate(data)
makeConnection(s)
except twitter.TwitterError:
print 'Post Unsuccessful. Error Occurred'
def makeConnection(s):
while True:
print "connected with: " + str(na)
try:
data = ns.recv(4096)
print data
PostToTwits(data)
except:
ns.close()
s.close()
break
makeConnection(s)

Your problem is that you are working with pure sockets which know nothing about HTTP protocol. Take a look at Flask or Bottle web micro frameworks to see how to turn python script or function into web endpoint.

you need a webserver so that your can make request via web browser.
you can web framework like flask or django or you can use webpy.
A simple example using webpy from their website
import web
urls = (
'/(.*)', 'hello'
)
app = web.application(urls, globals())
class hello:
def GET(self, name):
if not name:
name = 'World'
return 'Hello, ' + name + '!'
if __name__ == "__main__":
app.run()
then you call url(your python function) from javascript.

You can totally write a simple web server using sockets, and indeed you've done so. But this approach will quickly get tedious for anything beyond a simple exercise.
For example, your code is restricted to handling a single request handler, which goes to the heart of your problem.
The url on the post request is wrong. In your setup there is no notion of a url "tweet.py". That url would actually work if you were also serving the web page where the jquery lives from the same server (but you can't be).
You have to post to "http://localhost:9999" and you can have any path you want after:"http://localhost:9999/foo", "http://localhost:9999/boo". Just make sure you run the python script from the command line first, so the server is listening.
Also the difference between a get and a post request is part of the HTTP protocol which your simple server doesn't know anything about. This mainly means that it doesn't matter what verb you use on the ajax request. Your server listens for all HTTP verb types.
Lastly, I'm not seeing any data being returned to the client. You need to do something like ns.sendall("Some response"). Tutorials for building a simple http server abound and show different ways of sending responses.