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A simple yarn ","image":{"id":"cjfwjtmf1177g01692ug3tzwl","url":"static/cjeqgftvknnr30199dvw266qh/aws-lambda.jpg"},"posts_tags":[{"tag":{"id":"3pl7ejawubufz70vjnad","name":"AWS"}},{"tag":{"id":"2spo553zykbgxgq4vkk3","name":"Javascript"}}],"date":"December 31, 2019","html":"
Using node-canvas on AWS Lambda can be a pain because node-canvas has dependencies. A simple yarn add or npm install will not suffice.
\n\nAutomattic's node-canvas extends the familiar canvas API in the browser to Node. With node-canvas you can draw shapes, apply text and overlay images. The data types node-canvas interfaces with are interchangeable. For example, you can apply text and images to a canvas and stream the canvas PDF, png, jpg, array buffer, and so forth.
\nAWS Lambda is runs on Amazon's special flavor of linux.
\nNode-canvas requires a few packages like Cairo and Pango to function. To get Node-canvas up and running on AWS lambda, you need to compile native libraries in an identical EC2 instance. Next, copy the binaries from the server to your local machine and include them in your package that you upload to AWS lambda.
\nThe quick and dirty solution is to git clone this repo: https://github.com/unshift/canvas-lambda.git
\nThe lib directory includes the .so files and a latest, precompiled version of canvas (v1.6.7 - the latest as of this writing).
\nThe trick to getting AWS lambda to recognize the path to the native modules is to modify the environmental variables PATH, LD_LIBRARY_PATH, PKG_CONFIG_PATH.
\nprocess.env['PATH'] = process.env['PATH'] + ':' + process.env['LAMBDA_TASK_ROOT'] + '/lib';\nprocess.env['LD_LIBRARY_PATH'] = process.env['LAMBDA_TASK_ROOT'] + '/lib';\nprocess.env['PKG_CONFIG_PATH'] = process.env['LAMBDA_TASK_ROOT'] + '/lib';
\nNext, drop the binaries in the lib directory of the root of your lambda function, e.g.:
\nUse this bash script to install dependencies: https://gist.github.com/unshift/cdebd9a1da98816514789b62cbe7797d
\ninstall_node_canvas_binaries.sh installs the following at /canvas/:
\nNext it copies the native modules to /var/task/lib.
\n/var/task is where Lambda functions live.
\nThe last step is to npm install canvas (discussed below).
\nsudo su -.
sudo yum install nodejs npm --enablerepo=epel
cd /tmp\nwget https://gist.githubusercontent.com/unshift/cdebd9a1da98816514789b62cbe7797d/raw/57a11195bb6ab9aae13dc4f97eec8ce2b0b5a771/install_node_canvas_binaries.sh\nsh install_node_canvas_binaries.sh\ncd /var/task/lib\nnpm install canvas\ncd node_modules/canvas\nnode-gyp rebuild
\n