thermograph/frontend/server/internal/content
Emi Griffith 2f0bda1e28
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frontend: fetch City() concurrently with the page's primary API call
MonthPage and RecordsPage each made two backend calls sequentially
(CityMonth/CityRecords, then City) where the second never depended on the
first's result -- both are independent single-slug lookups. Waiting for
one full round trip before even starting the other was pure latency with
nothing to show for it.

fetchWithCity launches both concurrently via goroutines and a WaitGroup.
Verified live against a stub with an injected 400ms delay on both
endpoints: city page (1 call) and month/records pages (2 calls each) all
cost ~0.404s now, not ~0.404s vs ~0.8s -- the two-call pages no longer pay
double.

Error priority is preserved exactly: if the primary call fails, its error
wins even when City also fails or hasn't finished, matching the old
sequential code (which never called City() once primary had already
failed). The one real trade-off, called out in the comment: City() is now
always launched even on a request that's about to 404 from primary, so an
invalid slug costs one extra (wasted, cheap) backend lookup it previously
skipped -- worth it since a bad slug is the rare path and a good one is
the common path this speeds up.

Tests: happy path; primary-error-wins and city-error-surfaces (both single
and combined failure); and a deterministic concurrency proof via
rendezvous channels rather than timing (the old sequential code would
deadlock this test, not just run it slower). Full suite green under
`-race -count=2`. Docker build (which runs `go test` inside the image)
passes.
2026-07-23 23:04:17 -07:00
..
content.go frontend: rewrite the SSR content service in Go (#28) 2026-07-24 00:53:48 +00:00
content_test.go frontend: fetch City() concurrently with the page's primary API call 2026-07-23 23:04:17 -07:00
funcmap.go frontend: rewrite the SSR content service in Go (#28) 2026-07-24 00:53:48 +00:00
pages.go frontend: fetch City() concurrently with the page's primary API call 2026-07-23 23:04:17 -07:00
seo.go frontend: rewrite the SSR content service in Go (#28) 2026-07-24 00:53:48 +00:00