An Apex Lambda function built using aws codebuild, running native phantom js taking html css and returns a signed AWS s3 url link for the user to download the files
Install NPM dependencies:
$ yarn && cd functions/convert && yarn && ../..
Setup Apex, see https://github.com/apex/apex/tree/master/_examples/babel-webpack2
Deploy the functions:
$ apex deploy
Supported Apis
http://phantomjs.org/api/webpage/
Try it out
curl -H "Content-Type: application/json" -H "Accept: application/pdf" -X POST -d '{ "html": "<p>Hello World</p>", "css": "* { color: orange; }", "pageConfig": { "paperSize" : { "format": "A4", "orientation": "landscape" } } }' https://4bsdjq15h1.execute-api.us-east-1.amazonaws.com/prodExample payload
{
"html": "<p>Hello World</p>",
"css": "* { color: orange; }",
"pageConfig": {
"paperSize" : {
"format": "A4",
"orientation": "landscape"
}
}
}Limitations
- http://docs.aws.amazon.com/lambda/latest/dg/limits.html
- 2 dashboard charts is around 0.8mb, limit for payload is is 6mb, so theoretically we could print a dashboard with 13-20 dashboards depending on type (excluding images), if we really really wanted to, we could gzip -> base64 encode the content to send more.
- current implementation which is to transfer html + css to render, bypassing login auth etc. We can easily render more images if we made a webpage for lambda to view.
- delete requests on s3 are free, so implementing a TTL (time to live) lambda that triggers every day / minute / second to delete files will cost pretty much nothing https://aws.amazon.com/s3/pricing/ 1 million free (lambda calls) / month
- because this is lambda, we can also pretty much handle all pdf generation in excess of 2000 / second.