Formatting SQL in the Browser Using PEG
Blog post from Sentry
In 2023, Sentry's Performance team developed a custom SQL formatter as part of their "Queries" feature to enhance database monitoring. This new tool addresses the unique challenges faced by Sentry's database operations, such as handling invalid SQL frequently generated by the system and supporting JSX output for interactive formatting. The formatter was designed to parse SQL strings, which often include placeholders and truncated elements, by using a simple grammar that can accommodate invalid syntax and special Sentry-specific characteristics. The formatter outputs both plain strings and JSX nodes, allowing for highlighted and styled display of queries. The team employed a Parsing Expression Grammar (PEG) approach due to its flexibility and already existing use within the app, and further refined the formatter through telemetry data to ensure efficient performance in production environments. The project's success demonstrates the team's ability to innovate by treating parsing and formatting as a problem-solving exercise tailored to Sentry's specific needs.
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