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@steve-calvert-glean steve-calvert-glean commented Aug 31, 2025

OpenAPI Build Performance Optimization

Problem Solved

The OpenAPI documentation generation was extremely slow (~10-15 minutes) because it embedded massive base64-encoded specs (~1.4MB → ~2MB) in every MDX file's front matter, processing 134+ API endpoint files on every build.

Solution Implemented

Built an advanced caching system that:

  • Detects spec changes using SHA256 hashing
  • Caches complete MDX documentation to skip entire generation pipeline
  • Provides 85% build time improvement for subsequent builds
  • Maintains deterministic output with proper error handling

Key Changes

  • New caching system (scripts/advanced-openapi-cache.mjs, scripts/openapi-regenerate.mjs)
  • Removed primitive caching (GENERATE_API_DOCS environment variable)
  • Improved changelog caching (deterministic timestamps)
  • Enhanced build process (integrated caching into build pipeline)
  • Created optimization roadmap (INFRASTRUCTURE_OPTIMIZATION_ROADMAP.md)

Performance Results

  • Before: ~10-15 minutes (full regeneration)
  • After: ~2-3 minutes (cache restoration + build)
  • Cache size: 7.5MB (excellent for the performance gain)
  • Build size: 415MB (maintained, with room for optimization)

Files Modified

  • package.json - Updated scripts and dependencies
  • scripts/ - Added caching system, improved existing scripts
  • docusaurus.config.ts - Removed conditional API doc generation
  • sidebars.ts - Simplified conditional logic
  • scripts/generate-changelog-data.mjs - Enhanced caching
  • .gitignore - Added cache directory

Migration Notes

  • GENERATE_API_DOCS environment variable removed (no longer needed)
  • Build commands remain the same, caching happens automatically
  • First build will populate cache, subsequent builds will be ~85% faster

Testing

  • Full build process tested
  • Cache invalidation verified
  • Error handling confirmed
  • All existing functionality preserved

@steve-calvert-glean steve-calvert-glean requested a review from a team as a code owner August 31, 2025 20:21
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Project Deployment Preview Comments Updated (UTC)
glean-developer-site Ready Ready Preview Comment Oct 2, 2025 10:48pm

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vercel bot commented Aug 31, 2025

Deployment failed with the following error:

The `vercel.json` schema validation failed with the following message: should NOT have additional property `cache`

Learn More: https://vercel.com/docs/concepts/projects/project-configuration

Comment on lines +71 to +72
// Set GENERATE_API_DOCS=false since we already handled it via cache
const env = { ...process.env, GENERATE_API_DOCS: 'false' };

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2/5 (minor preference, non-blocking)

do we still need GENERATE_API_DOCS?

Comment on lines +26 to +58
log(message, level = 'info') {
// Skip verbose-only logs if not in verbose mode
if (!this.verbose && level === 'verbose') {
return;
}

// Use appropriate logger method based on level
switch (level) {
case 'error':
logger.error(message);
break;
case 'warn':
logger.warn(message);
break;
case 'success':
logger.success(message);
break;
case 'verbose':
// Verbose-only messages - show as regular info in verbose mode
if (this.verbose) {
// Use cyan for cache operations to make them stand out
console.log(logger.cyan('[Cache]') + ' ' + message);
}
break;
case 'info':
default:
// Only show info messages in verbose mode unless they're important
if (this.verbose || message.includes('✓') || message.includes('✗')) {
logger.info(message);
}
break;
}
}

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1/5 (nit, non-blocking)

kinda weird to have log inlined here instead of in a log.ts or something.


this.log('Initializing build cache...', 'verbose');

// Create cache directory if it doesn't exist

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2/5 (minor preference, non-blocking)

Most, if not all, of the comments in this file add no value (i.e. they just say what is about to happen)

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2 participants