Adding a working example of Lambda function in Python that uses Google Cloud Vision API

Author: caiosba

python-lambda-example/.gitignore

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+credentials.json
+package
+package.zip

python-lambda-example/README.md

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+This is an example of a Python lambda function that uses Google Cloud Vision API.
+
+* Compile the code: `$ ./bundle.sh`
+* Upload `package.zip` to AWS Lambda
+* If you need to install a dependency: `pip install --target ./package <package name>`
+
+Reference: https://docs.aws.amazon.com/lambda/latest/dg/python-package.html#python-package-create-package-with-dependency

python-lambda-example/bundle.sh

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+#!/bin/bash
+rm -f package.zip
+rm -rf package
+pip install --target ./package requests
+pip install --target ./package google-cloud-vision
+cd package
+zip -r ../package.zip .
+cd ..
+zip -g package.zip lambda_function.py
+zip -g package.zip credentials.json
+echo 'Now upload package.zip to AWS Lambda (please make sure that the Lambda function timeout configuration is enough)'

python-lambda-example/credentials.json.example

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+{
+  "type": "service_account",
+  "project_id": "",
+  "private_key_id": "",
+  "private_key": ""
+  "client_email": "",
+  "client_id": "",
+  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
+  "token_uri": "https://oauth2.googleapis.com/token",
+  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
+  "client_x509_cert_url": ""
+}

python-lambda-example/lambda_function.py

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+from google.cloud import vision
+import os
+os.environ['GOOGLE_APPLICATION_CREDENTIALS'] = "credentials.json"
+def lambda_handler(event, context):
+    client = vision.ImageAnnotatorClient()
+    print(client)