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Sketchviz [1] runs almost entirely in free tiers from Cloudflare and AWS: - Cloudflare to avoid big bandwidth bills from AWS for the wasm-compiled graphviz tha

Sketchviz [1] runs almost entirely in free tiers from Cloudflare and AWS: - Cloudflare to avoid big bandwidth bills from AWS for the wasm-compiled graphviz that is on every page - AWS Lambda's 1M free requests and 400,000 GB-seconds for expressjs (web serving) and graphviz (rendering hostable .png images) - API Gateway's 1M free requests for routing HTTP -> AWS Lambda (for the app) or S3 (for hosted PNGs) - S3's 20K GET requests/mo (for hosted PNGs) The only one I exceed is S3, but it's dirt cheap. [1]: https://sketchviz.com/new https://sketchviz.com/new

coopreme 5y ago
Bravo. Very cool leveraging services this way, I like your idea of architecting to optimize free tier svcs.
zoover2020 5y ago
Cool stuff! Inspiring :)
watermelon0 5y ago
Nice. I assume you are hosting PNGs for 'get embed code' feature? Could you instead store diagram definition in DynamoDB free tier, and create PNGs on the fly?
- cldellow 5y ago
  Yeah, it's for get embed code. Could definitely have used Dynamo as a persistent layer, but the PNGs are transient - the definition is stored in a GitHub gist owned by the user (another free tier! :). But generating the PNGs is expensive, so they get cached in S3. An S3 lifecycle rule automatically prunes PNGs older than a month, and they'll get regenerated from the gist if needed.
  - orf 5y ago
    A month seems like a long time, I’d have assumed you could probably delete 95% of the images within 3 days. Out of interest is the month long expire rule a guesstimate or something based on actual numbers?
    - cldellow 5y ago
      It's just a number, I haven't looked at any request logs to see what hit rates are like. From a money perspective, expiring them never would be fine, and a good trade off to get better latency on subsequent loads. However, if the underlying gist is deleted, I'd like the PNG to eventually go away.
sireat 5y ago
Super cool! Curious does your implementation of DOT support embedding of images? Theoretically it should be possible: http://www.graphviz.org/doc/info/attrs.html#d:image http://www.graphviz.org/doc/info/attrs.html#d:image

coopreme 5y ago

Bravo. Very cool leveraging services this way, I like your idea of architecting to optimize free tier svcs.

zoover2020 5y ago

Cool stuff! Inspiring :)

watermelon0 5y ago

Nice. I assume you are hosting PNGs for 'get embed code' feature? Could you instead store diagram definition in DynamoDB free tier, and create PNGs on the fly?

cldellow 5y ago
Yeah, it's for get embed code. Could definitely have used Dynamo as a persistent layer, but the PNGs are transient - the definition is stored in a GitHub gist owned by the user (another free tier! :). But generating the PNGs is expensive, so they get cached in S3. An S3 lifecycle rule automatically prunes PNGs older than a month, and they'll get regenerated from the gist if needed.
- orf 5y ago
  A month seems like a long time, I’d have assumed you could probably delete 95% of the images within 3 days. Out of interest is the month long expire rule a guesstimate or something based on actual numbers?
  - cldellow 5y ago
    It's just a number, I haven't looked at any request logs to see what hit rates are like. From a money perspective, expiring them never would be fine, and a good trade off to get better latency on subsequent loads. However, if the underlying gist is deleted, I'd like the PNG to eventually go away.

sireat 5y ago

Super cool! Curious does your implementation of DOT support embedding of images? Theoretically it should be possible: http://www.graphviz.org/doc/info/attrs.html#d:image http://www.graphviz.org/doc/info/attrs.html#d:image