Every request went through the module-level requests.get/put/post/delete
helpers, so each one paid a fresh DNS+TCP+TLS handshake. Measured today
against the real backends that is 95ms/req to api.github.com and 52ms to
Realtime Database -- on a 27-request diet-guard tick, most of the wall clock.
Each transport module now binds a pooling requests.Session to the name
`requests`. A Session is a drop-in for those helpers, so all 9 call sites and
all 16 tests that patch `<module>.requests.<verb>` are untouched; the real
module stays available as `_requests` for the RequestException/Response
references. Sessions are per-module rather than shared because the tests use
sequence-consuming side_effect lists, where one module could otherwise eat
another's queued response.
Transient failures now retry, restricted to GET: a PUT here carries a
Contents-API sha, and replaying one whose response was merely lost would
write against a stale precondition on a remote the phone also reads.
Also thread timeout_seconds through firebase_client_for, which accepted none,
so a caller's tighter budget silently reached the GitHub backend only.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VCucBhUkHBBHHbsY7bSdGV
Everything an app needs to move from GitHub to Firebase without each one
reinventing the wiring.
Python:
- _config.py: FirebaseConfig.load() + firebase_client_for(app) +
mirror_client_for(app, github). One config file, read in one place.
Credential caches stay per-app (~/.config/<app>/firebase_auth.json) --
one file written by several processes is a corruption waiting to happen.
- tool/preflight_firebase.py: validates the config before any data moves.
Catches a wrong-region databaseUrl (which answers 404 with a correctUrl
body rather than an error, so it would otherwise pass every check and
break mid-migration) and confirms the uid in the ID token matches the uid
the rules pin -- sign_in() returns None and discards localId, so the uid
is decoded from the JWT.
- tool/interop_seed.py: the missing Python half of the cross-language
check. interop_check.dart asserts it can see a record written by Python,
but nothing ever wrote one, so it could only ever fail.
Dart:
- firebase_config.dart: the same config shape, kept free of dart:io so it
works on web and Android, where the file does not exist at all and
credentials belong in flutter_secure_storage.
- PersistedSyncStateStore: the revision cache, persisted. Without it a
phone forgets every peer revision on each cold start and re-downloads
everything -- the exact traffic the revision scheme exists to avoid, and
what the free-tier headroom depends on.
Verified live against the real database: preflight passes all five checks,
the Dart smoke test passes end to end, and Python <-> Dart interop is OK.
Python 226 tests at 100% branch coverage; Dart 218 tests, both new files
at 100% line coverage.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SJ9sxEw3ymzXNjL7SHNpJc
