Lambda@Edge A/B testing - Viewer Request
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'use strict'; | |
const sourceCoookie = 'X-Source'; | |
const sourceMain = 'main'; | |
const sourceExperiment = 'experiment'; | |
const experimentTraffic = 0.5; | |
// Viewer request handler | |
exports.handler = (event, context, callback) => { | |
const request = event.Records[0].cf.request; | |
const headers = request.headers; | |
// Look for source cookie | |
if ( headers.cookie ) { | |
for (let i = 0; i < headers.cookie.length; i++) { | |
if (headers.cookie[i].value.indexOf(sourceCoookie) >= 0) { | |
console.log('Source cookie found. Forwarding request as-is'); | |
// Forward request as-is | |
callback(null, request); | |
return; | |
} | |
} | |
} | |
console.log('Source cookie has not been found. Throwing dice...'); | |
const source = ( Math.random() < experimentTraffic ) ? sourceExperiment : sourceMain; | |
console.log(`Source: ${source}`) | |
// Add Source cookie | |
const cookie = `${sourceCoookie}=${source}` | |
console.log(`Adding cookie header: ${cookie}`); | |
headers.cookie = headers.cookie || []; | |
headers.cookie.push({ key:'Cookie', value: cookie }); | |
// Forwarding request | |
callback(null, request); | |
}; |
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