https://jonnie.github.io/tags/go/Recent content in Go on Jonathan FranklinHugoenFri, 19 Feb 2021 00:00:00 +0000https://jonnie.github.io/work/merchant-image-proxy/Fri, 19 Feb 2021 00:00:00 +0000https://jonnie.github.io/work/merchant-image-proxy/<h2 id="problem">Problem</h2> <p>Pricesearcher displayed product images hosted by merchants, with differing URL formats and image-serving behaviour. The site needed a common endpoint for image requests, resizing and caching.</p> <h2 id="architecture">Architecture</h2> <p>The service was the company&rsquo;s fork of <a href="https://github.com/willnorris/imageproxy">willnorris/imageproxy</a>, exposed as a signed company-domain endpoint and deployed on AWS Lambda behind API Gateway. Terraform managed separate staging and production environments.</p> <h2 id="what-i-built">What I built</h2> <ul> <li>Maintained and customised the existing Go fork.</li> <li>Added options to pass through the original image or return no image when processing failed, instead of always using the default placeholder.</li> <li>Fixed decoding and encoding behaviour that corrupted proxied URLs containing special characters.</li> <li>Aligned the Terraform version with the deployments&rsquo; remote state.</li> </ul> <h2 id="engineering-decisions">Engineering decisions</h2> <ul> <li>The implementation extended the upstream proxy rather than replacing its existing resizing and caching behaviour.</li> <li>Fallback behaviour was configurable between the original image, no image and the upstream default placeholder.</li> </ul> <h2 id="technologies">Technologies</h2> <p>Go, AWS Lambda, API Gateway, Terraform, Docker, Jenkins.</p>