I wish to create s3 event from nodejs lambda function to to call another lambda function.
for example-> I have a lambda function test1 that creates s3 bucket and attaches the event to the bucket such that on the occurence of the event it call some different lambda function.
Problem -> I can create the lambda function to create an s3 bucket but I am not able to find create event method in AWS S3 documentation to implement this.
It is called BucketNotificationConfiguration in s3.
Refer
http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#putBucketNotificationConfiguration-property
http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketPUTnotification.html
http://docs.aws.amazon.com/lambda/latest/dg/with-s3.html
Related
I am working in node js. I want to execute the trigger when user upload the files to s3. So I created the script in node js which will upload the file to s3 bucket. But s3 event is not fired, however whenever I upload the file to s3 manually then trigger fires.
Please help
Since in your questions some things are unclear i.e. which method you are using in node js to upload file and what is your configuration in AWS Lambda to trigger the event.
I would recommend If you are using s3.upload() then try to use s3.putObject({}) to upload file in S3.
Check the trigger configuration is rightly created in AWS Lambda, Make sure the Event type as PUT is selected.
Check for IAM policy for the lambda function. It should have the below permission:
S3:PutBucketNotification
I saw different questions/answers but I could not find the one that worked for me. Hence, I am really new to AWS, I need your help. I am trying to download gzip file and load it to the json file then upload it to the S3 bucket using Lambda function. I wrote the code to download the file and convert it to json but having problem while uploading it to the s3 bucket. Assume that file is ready as x.json. What should I do then?
I know it is really basic question but still help needed :)
This code will upload to Amazon S3:
import boto3
s3_client = boto3.client('s3', region_name='us-west-2') # Change as appropriate
s3._client.upload_file('/tmp/foo.json', 'my-bucket', 'folder/foo.json')
Some tips:
In Lambda functions you can only write to /tmp/
There is a limit of 512MB
At the end of your function, delete the files (zip, json, etc) because the container can be reused and you don't want to run out of disk space
If your lambda has proper permission to write a file into S3, then simply use boto3 package which is an AWS SDK for python.
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/s3.html
Be aware that if the lambda locates inside of VPC then lambda cannot access to the public internet, and also boto3 API endpoint. Thus, you may require a NAT gateway to proxy lambda to the public.
The context here is simple, there's a lambda (lambda1) that creates a file asynchronously and then uploads it to S3.
Then, another lambda (lambda2) receives the soon-to-exist file name and needs to keep checking S3 until the file exists.
I don't think S3 triggers will work because lambda2 is invoked by a client request
1) Do I get charged for this kind of request between lambda and S3? I will be polling it until the object exists
2) What other way could I achieve this that doesn't incur charges?
3) What method do I use to check if a file exists in S3? (just try to get it and check status code?)
This looks like you should be using an S3 objectCreated trigger on the Lambda. That way, whenever an object gets created, it will trigger your Lambda function automatically with the file metadata.
See here for information on configuring an S3 event trigger
Let me make sure I understand correctly.
Client calls Lambda1. Lambda1 creates a file async and uploads to S3
the call to lambda one returns as soon as lambda1 has started it's async processing.
Client calls lambda2, to pull the file from s3 that lambda1 is going to push there.
Why not just wait for Lambda one to create the file and return it to client? Otherwise this is going to be an expensive file exchange.
I am working on a project which uses the zoom functionality for images. In few images, zoom is not working. I need to know few things:
1) How AWS Lambda function helps me in this?? As the images are stored in the s3 bucket.
2) How to implement Lambda function on my local.
Can I use lambda to compress images under a bucket?
I can get the images under a particular bucket visa listObject. How do you compress these returns and write it in another bucket?
Yes, you can absolutely use lambda. Try this library: aws-lambda-image-compressor
AWS lambda function to compress and resize images
This is a Lambda Function which resizes/reduces images automatically. When an image is put on some AWS S3 bucket, this function will resize/reduce it and save it into a new bucket. I have used it in the past and I loved it.
Usage
edit lambda-config.js file and assign name, description, memory size, timeout of your lambda function.
edit .env file with your AWS access data
npm install
gulp deploy
You can also try this other library which is more popular in the crowd - aws-lambda-image
If you really want to create something of your own and want a good start.
I would recommend these 2 articles that explain it very well -
Image conversion using Amazon Lambda and S3 in Node.js
Automating Image Compression Using S3 & Lambda
If you are fine to use Amazon API Gateway then u can follow this AWS Compute Blog -
Resize Images on the Fly with Amazon S3, AWS Lambda, and Amazon API Gateway
Hope this was useful.