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cfunctions

Project description

CFunctions

CFunctions (cloud functions, compute functions, construct functions) are a building block of the [constructs programming model] which can be used to package JavaScript code and run it on a cloud system.

Let's take a look at a simple CFunction:

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
{ CFunction } = require("cfunctions")

cfunc = CFunction(
    capture=["x", "y"],
    code="x + y"
)

print("outfile:", cfunc.outfile)
print("env:", cfunc.env)

The output will look like this:

outfile: /tmp/.cf.out.TAJEO8/cf.js
env: { __CF__x__: '100', __CF__y__: '200' }

The cf.js file is a a self-contained JavaScript module which can be loaded through a require() statement and returns an async function that executes the code after binding it from a set of environment variables.

Let's execute our cfunction:

$ export __CF__x__=123
$ export __CF__y__=10
$ node -e "require('/tmp/.cf.out.TAJEO8/cf.js')().then(result => console.log(result))"
12310

The CFunction.exec() static method can also be used to execute the function:

const result = CFunction.exec('/tmp/.cf.out.TAJEO8/cf.js', {
  env: {
    __CF__x__: 123,
    __CF__y__: 10
  }
});

console.log(result);

License

Licensed under the Apache 2.0 license.

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