The function throws an error based on a % chance provided by an environment variable.
This snippet creates a Lambda function in Node.js that has a percentage chance of throwing an error. The code uses a Lambda environment variable called CHANCE_OF_FAILURE, which is a value between 0 and 100. If this environment variable is not present, it defaults to 50 (a 50% chance of throwing an error).
This function can be useful for testing failure modes and retry behaviors when consuming events from upstream services.
Copy the code into Lambda
exports.handler = async (event) => {
const coinToss = Math.random()*100
const failureRate = process.env.CHANCE_OF_FAILURE || 50
console.log({coinToss, failureRate})
if ( coinToss < failureRate) {
console.error('Error')
throw Error("There was an error")
} else {
return {
statusCode: 200,
body: JSON.stringify('Hello from Lambda!'),
}
}
}
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