What is wrong in the following Lambda code that throws up module error? - json

Question

Using the following code to use make an API that connects to Amazon AWS. This is the AMazon Lambda code that I use-
import boto3
import json
import requests
from requests_aws4auth import AWS4Auth
region = 'us-east-1'
service = 'es'
credentials = boto3.Session().get_credentials()
awsauth = AWS4Auth(credentials.access_key, credentials.secret_key, region,
service, session_token=credentials.token)
host = 'XXX.com'
index = 'items'
url = 'https://' + host + '/' + index + '/_search'
# Lambda execution starts here
def handler(event, context):
# Put the user query into the query DSL for more accurate search results.
# Note that certain fields are boosted (^).
query = {
"query": {
"multi_match": {
"query": event['queryStringParameters']['q'],
}
}
}
# ES 6.x requires an explicit Content-Type header
headers = { "Content-Type": "application/json" }
# Make the signed HTTP request
r = requests.get(url, auth=awsauth, headers=headers,
data=json.dumps(query))
# Create the response and add some extra content to support CORS
response = {
"statusCode": 200,
"headers": {
"Access-Control-Allow-Origin": '*'
},
"isBase64Encoded": False
}
# Add the search results to the response
response['body'] = r.text
return response
This should connect to an AWS ES cluster with endpoint XXX.com
Getting output when trying to test -
START RequestId: f640016e-e4d6-469f-b74d-838b9402968b Version: $LATEST
Unable to import module 'index': Error
at Function.Module._resolveFilename (module.js:547:15)
at Function.Module._load (module.js:474:25)
at Module.require (module.js:596:17)
at require (internal/module.js:11:18)
END RequestId: f640016e-e4d6-469f-b74d-838b9402968b
REPORT RequestId: f640016e-e4d6-469f-b74d-838b9402968b Duration:
44.49 ms Billed Duration: 100 ms Memory Size: 128 MB Max
Memory Used: 58 MB

Answer 1

While creating a Lambda function, we need to specify a handler, which is a function in your code, that the AWS Lambda service can invoke when the given Lambda function is executed.
By default, a Python Lambda function is created with handler as lambda_function.lambda_handler which signifies that the service must invoke lambda_handler function contained inside lambda_function module.
From the error you're receiving, it seems that the handler is incorrectly configured to something like index.<something>, and since there's no Python module called index in your deployment package, Lambda is unable to import the same in order to start the execution.

Answer 2

If i am getting things correctly to connect to a AWS ES cluster you need something of this sort
import gitlab
import logging
from elasticsearch import Elasticsearch, RequestsHttpConnection
from requests_aws4auth import AWS4Auth
import boto3
#from aws_requests_auth.aws_auth import AWSRequestsAuth
LOGGER = logging.getLogger()
ES_HOST = {'host':'search-testelasticsearch-xxxxxxxxxx.eu-west-2.es.amazonaws.com', 'port': 443}
def lambda_handler(event, context):
LOGGER.info('started')
dump2={
'number': 9
}
service = 'es'
credentials = boto3.Session().get_credentials()
print('-------------------------------------------')
print(credentials.access_key)
print(credentials.secret_key)
print('--------------------------------------------------------')
awsauth = AWS4Auth(credentials.access_key, credentials.secret_key, "eu-west-2", service, session_token=credentials.token)
es = Elasticsearch(hosts=[ES_HOST], http_auth = awsauth, use_ssl = True, verify_certs = True, connection_class = RequestsHttpConnection)
DAVID_INDEX = 'test_index'
response = es.index(index=DAVID_INDEX, doc_type='is_this_important?', body=dump2, id='4')