Build the session runtime from platform ports instead of DurableObjectState (COL-83) - #1715
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createSessionRuntime now takes a SessionPlatform record of ports the session owns (id, sql, transactionSync, db, alarmStore, sockets, createBackgroundTasks) instead of the Durable Object's ctx. The Cloudflare adapter, createDurableObjectSessionPlatform, maps DurableObjectState onto that record; SessionDO builds it once and passes it to initSchema and the composition root. SocketPlatform (accept, tags, all, setAutoResponse) is the host socket surface the WebSocket manager is built over; the manager's constructor takes it instead of DurableObjectState. No behavior change. Linear: COL-83 (P-1) Claude-Session: https://claude.ai/code/session_01R6uhDAxoGDWn4Y33swJk7D
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Included review availability: Your plan provides up to 8 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughThe session runtime now uses a host-provided platform abstraction. Cloudflare Durable Object state implements the abstraction. Storage, SQL, alarms, background tasks, and WebSocket operations now use platform interfaces. Session construction requires a database binding. ChangesSession platform integration
Estimated code review effort: 3 (Moderate) | ~30 minutes Merge Risk: 🔵 Low · up to The PR preserves current Cloudflare behavior and makes the shared database mandatory, but the portable runtime contract still leaves WebSocket upgrade handling tied to Cloudflare and relies on future adapters to keep session capabilities consistently owned. The change is mergeable with explicit owner awareness that alternate-host support remains incomplete. Sequence Diagram(s)sequenceDiagram
participant SessionDO
participant CloudflarePlatform
participant SessionRuntime
participant SocketHost
participant DurableObjectStorage
SessionDO->>CloudflarePlatform: create platform with state and DB
CloudflarePlatform->>DurableObjectStorage: expose storage and transactionSync
CloudflarePlatform-->>SessionDO: return SessionPlatform
SessionDO->>SessionRuntime: create runtime from platform
SessionRuntime->>SocketHost: accept and enumerate sockets
SessionRuntime->>DurableObjectStorage: initialize schema and run transactions
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Summary
PR #1715, Build the session runtime from platform ports instead of DurableObjectState (COL-83) by @ColeMurray changes 8 files (+249/-75). The refactor cleanly moves Cloudflare-specific session capabilities behind explicit platform ports while preserving the existing runtime composition and behavior.
Critical Issues
None.
Suggestions
None.
Nitpicks
None.
Positive Feedback
- The adapter keeps Cloudflare-specific APIs at the boundary and preserves transaction binding, alarm behavior, hibernatable socket tags, auto-response construction, and event-lifetime extension.
- The background-task factory correctly receives the session-scoped logger, retaining session attribution for asynchronous failures.
- The new adapter tests cover both direct delegation and the important rejected-background-task error path; focused unit and integration tests also pass.
Questions
None.
Verification
Control-plane typechecking passed. The focused unit suite passed 69 tests, and the affected integration suite passed 4 tests.
Verdict
Approve: Ready to merge.
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Actionable comments posted: 1
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Inline comments:
In `@packages/control-plane/src/session/platform.ts`:
- Line 16: Extend the SocketPlatform interface with a WebSocket-pair creation
operation, update SessionWebSocketManagerImpl.createUpgradeSockets to obtain the
pair through that port instead of constructing WebSocketPair directly, and
implement the operation in the Cloudflare adapter while keeping all
WebSocketPair usage there.
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packages/control-plane/src/cloudflare/session-platform.test.tspackages/control-plane/src/cloudflare/session-platform.tspackages/control-plane/src/session/components.tspackages/control-plane/src/session/durable-object.tspackages/control-plane/src/session/platform.tspackages/control-plane/src/session/websocket-manager.test.tspackages/control-plane/src/session/websocket-manager.tspackages/control-plane/test/integration/session-components.test.ts
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The port is the host that owns the session's accepted sockets, so name it for that role rather than for where it comes from. Its enumeration is sockets(tag?) instead of all(tag?), readable at the call site. Claude-Session: https://claude.ai/code/session_01R6uhDAxoGDWn4Y33swJk7D
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The Cloudflare delegation is well tested and CI is green, but the new cross-platform boundary still preserves two invalid states that should be removed before this becomes the contract for additional hosts. Most importantly, one atomic session-storage capability has been split into independently swappable fields, and a required global database has been widened to nullable. Those choices carry existing incidental complexity into the new architecture instead of using this refactor to make the runtime model simpler and stricter.
The existing review thread about WebSocketPair is also material: a Node host still cannot construct the runtime without a Cloudflare global. I have not duplicated that inline comment.
components.ts decreases from 988 to 985 lines, so this PR does not cross the 1k threshold. All reported GitHub checks pass.
| */ | ||
| id: string; | ||
| /** The session's own SQLite store. */ | ||
| sql: SqlStorage; |
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[deep review] This splits one atomic storage capability into independently constructible sql, transactionSync, and alarmStore fields. A host can now satisfy SessionPlatform while repositories write through one connection, transactions protect another, and alarms persist against a third; the type's comment claims an invariant the type does not enforce. This is exactly the boundary where we should delete that invalid state rather than reproduce the shape of DurableObjectState. Please model one session-storage port that owns exec, transactionSync, and the alarm methods, then pass its narrowed views to consumers. The Cloudflare adapter becomes a single storage: ctx.storage assignment, and every future host is forced to preserve the load-bearing transaction/storage relationship.
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Done in a06e9b9 for the transactional half: sql and transactionSync are now one storage: SessionStorage port, so a host cannot supply a transaction primitive for a different connection than the statements it protects. The Cloudflare adapter is the single storage: ctx.storage assignment, and the Node adapter (N-1) returns the same shape. I kept alarmStore separate on purpose. Alarms are not part of the atomic capability: on Cloudflare transactionSync admits only synchronous sql.exec calls and the alarm methods are async, so there is no transaction/alarm relationship to protect, and on Node the wake-up registration is a host-level deadline index (so the host can find the earliest deadline without opening every session file), which is a separate object from the session's storage by design. Merging them would make every host build a facade over two unrelated things.
| /** Run `closure` atomically against `sql`. */ | ||
| transactionSync: TransactionSync; | ||
| /** The global store, or null when the deployment has none bound. */ | ||
| db: SqlDatabase | null; |
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[deep review] Env.DB is required, but the new host contract widens it to nullable and the Cloudflare root uses env.DB ?? null. That formalizes a partially functional runtime as a supported platform state, then forces the composition root to carry null branches, optional collaborators, and later non-null assertions. This refactor is the opportunity for the code-judo move: require SqlDatabase at the platform boundary and fail platform construction if a host cannot supply it. That makes every downstream global-store capability unconditional and removes an entire mode from the runtime instead of exporting legacy defensive optionality to every future host.
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Done in a06e9b9 at the boundary and in the composition root: SessionPlatform.db is SqlDatabase, the Durable Object refuses to construct without the binding (the same stance router.ts:881 already takes for HTTP), and the root no longer has a null mode: the index, pull-request and SCM-token stores, the scheduler, the authorization lookup, the lifecycle lookups and the token-refresh services are unconditional, and SandboxHandler lost its managedSecretsConfigured flag (it was only ever Boolean(db)). The collaborators that still accept SqlDatabase | null or SessionIndexStore | null in their own constructors keep those signatures in this PR; they are only handed non-null values now, and narrowing them is a mechanical follow-up tracked in COL-127 (https://linear.app/colemurray/issue/COL-127) so this PR stays reviewable.
SessionPlatform.storage carries the session's SQL store and the transaction primitive together, so a host cannot supply a transaction for a different connection than the statements it protects; the Cloudflare adapter is the single storage: ctx.storage assignment. The global store is required at the boundary. SessionDO refuses to construct without the DB binding, matching the router's 503, and the composition root no longer has a null-store mode: the index, pull-request and SCM-token stores, the scheduler, the authorization lookup, the lifecycle lookups and the token-refresh services are built unconditionally. SandboxHandler loses its managedSecretsConfigured flag, which was only ever Boolean(db). Collaborators that still accept nullable stores keep their signatures; narrowing them is COL-127. Claude-Session: https://claude.ai/code/session_01R6uhDAxoGDWn4Y33swJk7D
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Reviewed and verified against a local merge with main (Hono migration included): control-plane typecheck clean, 3,471 unit and 1,128 integration tests passing, eslint and prettier clean. Both blocking threads from the earlier round are addressed in a06e9b9. Ready to merge.
Non-blocking: the body's router.ts:881 reference is now routing/hono-app.ts:128 after #1716, and the fake-host comment in websocket-manager.test.ts still says DurableObjectState.
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Summary
First step on the critical path for running the control plane on AWS while staying multi-cloud (Linear COL-83, roadmap item P-1).
createSessionRuntime(platform, env)is the composition root for one session's runtime. Itsplatforminput was{ ctx: DurableObjectState; sql; db }, and thatctxwas the last place the session runtime reached into Cloudflare directly: the object id,storage.transactionSync, the alarm API, hibernatable-socket calls,setWebSocketAutoResponse, andwaitUntil. This PR replaces it with a record of ports the session owns, so a Node host can build the same runtime from its own adapters.What changed
session/platform.ts(new) definesSessionPlatform:id,storage(SessionStorage),db(the global store, required),alarmStore(AlarmScheduleStore),sockets(SocketHost), andcreateBackgroundTasks(log). The background-tasks port is a factory because the session-scoped logger is created inside the composition root; holding a logger in the platform record would losesession_idon background-failure logs.SessionStoragecarries the session's SQL store and the transaction primitive together ({ sql; transactionSync }), so a host cannot supply a transaction for a different connection than the statements it protects. The Cloudflare adapter is the singlestorage: ctx.storageassignment, and the Node adapter (N-1) returns the same shape.alarmStorestays a separate port: alarms are not insidetransactionSyncon Cloudflare (only synchronous SQL is), and on Node the wake-up registration is a host-level deadline index (N-7).SocketHostis the host that owns the session's accepted sockets, the surface the registry needs today:accept(ws, tags),tags(ws),sockets(tag?),setAutoResponse(request, response). The shape follows what P-3 (COL-50) planned, withsockets(tag?)in place ofall(). The optional tag is there because prod's copy of the manager already filters by"sandbox".dbis required at the boundary.Env.DBis already required and the HTTP router already refuses to serve without it (router.ts:881).SessionDOnow reads the binding once and refuses to construct without it, and the composition root no longer has a null-store mode: the session index, pull-request and SCM-token stores, the scheduler, the authorization lookup, the lifecycle lookups, and the token-refresh services are built unconditionally.SandboxHandlerloses itsmanagedSecretsConfiguredflag, which was only everBoolean(db), along with its two "Secrets not configured" branches and their tests.cloudflare/session-platform.ts(new) is the Cloudflare adapter:createDurableObjectSessionPlatform(ctx, db)maps aDurableObjectStateonto the record, including theWebSocketRequestResponsePairconstruction for the auto-response andcreateCloudflareBackgroundTasks(ctx, log).session/components.tsdestructures the ports instead ofctx. It no longer referencesDurableObjectState,WebSocketRequestResponsePair, or the CloudflareSqlStorageglobal.session/websocket-manager.tstakesSocketHostinstead ofDurableObjectState; the ninectx.*calls becomehost.accept/tags/sockets.session/durable-object.tsbuilds the platform once in the constructor and passes it toinitSchemaandcreateSessionRuntime. Still an adapter, 109 lines.SocketHostinstead ofDurableObjectState; a newcloudflare/session-platform.test.tspins the adapter's delegation (id, storage, alarm store, tag pass-through, auto-response pair, background-task failure logging); the integration test builds its doctored runtime through the adapter against the test environment's realDBbinding.What did not change
waitUntillifetime extension go through the same runtime calls as before. The one observable difference is a deployment with noDBbinding: the Durable Object now fails construction instead of running a degraded session, which HTTP already refused with a 503.ensureInitializedstill publishes the runtime last, so a throw during graph build retries on the next event.WebSocketPair(createUpgradeSockets) and theWebSocket.OPENchecks remain in the manager. The pair exists only to satisfy Cloudflare's 101webSocket:response; moving the upgrade behind a decision object is P-2 (COL-84), and finishing the manager's port is P-3 (COL-50).SqlDatabase | nullorSessionIndexStore | nullin their own constructors keep those signatures; they are only handed non-null values now, and narrowing them is COL-127.DurableObjectStatenow appears insrc/session/only indurable-object.ts, the Cloudflare adapter.Verification
Prod sync note
Prod's
websocket-manager.tscarries a local change inacceptAndSetSandboxSocketthat callsthis.ctx.getWebSockets("sandbox"). On sync that hunk becomesthis.host.sockets("sandbox"); the port already accepts the tag.https://claude.ai/code/session_01R6uhDAxoGDWn4Y33swJk7D
Summary by CodeRabbit
Refactor
Tests