How to сreate AWS Lambda Layer with Zeep Library

Python Zeep library designed to work with SOAP - services. Zeep is a pure-python module. However the lxml dependency does contain C code since it uses libxml2 and libxslt.

So the Zeep library can not be deployed into the Lambda Layer without some tricks. In one of my Serverless projects, I needed to use this library, and I found such a way to deploy it into the Layer:
First, as usual, create a directory:

mkdir -p python/lib/python3.6/site-packages/

Install Zeep via pip there:

pip install zeep --target python/lib/python3.6/site-packages/

The library with the dependencies will be installed in this directory. Go there and delete the lxml library folders:

Paste in the folder this version of the lxml library: https://github.com/BedrosovaYulia/aws-lambda-lxml/tree/master/3.8.0/py36/lxml (this version does not use libxml2 and libxslt) Now we can pack the pyton folder in a zip archive, upload it to Lambda Layer and work with SOAP. For example, we can get information about post tracking number from the Russian Post service:

	import json
	from zeep import Client
	def lambda_handler(event, context):
	url = 'https://tracking.russianpost.ru/rtm34?wsdl'
	barcode = event['barcode']
	my_login = '****************'
	my_password = '**************'
	client = Client(url)
	OperationHistoryRequest= {
	"Barcode":barcode,
	"MessageType":0,
	"Language":"RUS"
	}
	AuthorizationHeader= {
	"login":my_login,
	"password":my_password
	}
	with client.settings(strict=False):
	result = client.service.getOperationHistory(OperationHistoryRequest,AuthorizationHeader)
	info=''
	for item in result:
	try:
	info=info+str(item['OperationParameters']['OperDate'])+' '+str(item['AddressParameters']['DestinationAddress']['Index'])+' '+str(item['OperationParameters']['OperAttr']['Name'])
	info=info+'\n '
	except:
	pass
	#print(info)
	return {
	'statusCode': 200,
	'body': json.dumps(info)
	}

view raw PostTracking.py hosted with ❤ by GitHub

It works!