PulseTrade.Comm.Spa.Dynamic.Interactive.Client 0.1.74

PulseTrade.Comm.Spa.Dynamic.Interactive.Client

Interactive notebook iframe 的 WebSharper browser client。它只處理三件事：接收 authoritative RuntimeFrame、以 shared reducer 更新 SDUI、透過 correlated action channel 將使用者 mutation 送回 host。

NuGet package自0.1.0-alpha3起在contentFiles/any/any/ptcs-dynamic-interactive/攜帶可直接serve的client.js、client.min.js、WebSharper.Core.JavaScript/Runtime.js與bundle.manifest.json。Application module已包含Contracts/Renderer/UI/FSharp邏輯，唯一external import是同目錄樹內的Runtime；host不需建立assembly resource/module graph server。

Action wire

Browser 送出：

{ Protocol = "ptcs-dynamic-action.v1"
  Kind = "action-request"
  Request =
    { RequestId = "<canvas>:ui:<sequence>"
      ExpectedDocumentRevision = Some revision
      Action = action } }

Host 必須回傳同一個 RequestId 的 DynamicActionServerFrame，其 result 為 Accepted、Rejected 或 RevisionConflict。Accepted 不可直接修改document/data；真正的 mutation仍必須由host發布RuntimeFrame。Renderer唯一的presentation例外是accepted ChangeTaQuery：在callback已合併同批frames後，依current temporal axis選local viewport，不改authoritative state。

Client 同時間只保留一個 pending request。socket 未開啟、30 秒 timeout、disconnect、send failure 或 correlation mismatch 都會回傳 DynamicHostError 並 fail closed。既有 RuntimeClientFrame 的 mounted/unmounted/resync path 保持相容。

Application lifecycle

SPA entry point會呼叫Client.Application.start()。Host需要自行管理生命週期時可使用相同single-instance API：

let handle =
    Client.Application.startWithOptions
        { Client.defaultOptions with
            RootElementId = "app"
            StatusElementId = "sdui-runtime-status" }

// idempotent；不會建立第二條WebSocket
handle.Start()

let latest = handle.GetLastProjectionCommit()
let unsubscribe = handle.SubscribeProjectionCommitted(fun receipt -> consume receipt)

// terminal；送Unmounted、取消timer、關閉transport且不再重連
handle.Dispose()

每次current projection完成時，client同時更新application root的data-ptcs-runtime-commit-*level watermark，並dispatch bubbling ptcs-dynamic-runtime-committed-v1edge event；兩者內容同源。晚加入的consumer讀level，已先訂閱者讀edge或typed subscription。application重建／dispose不沿用舊canvas watermark，consumer必須以identity及DataRevision >= expected判斷完成。

client只從目前page的/view/推導same-origin/frames/ WebSocket，不接受remote URL、header或credential。transport close會保留原RuntimeState與renderer，以1秒起、30秒封頂的bounded backoff重連。replacement transport有既有runtime identity時只送一次Mounted與RequestFullSnapshot；valid Snapshot前畫面維持last-good。snapshot逾時會淘汰該socket generation並重連；舊generation callback不得排第二個timer或覆蓋新state。

Host integration

Host WebSocket receive loop 應先嘗試：

match BrowserRuntimeCodec.decodeActionRequest text with
| Ok request ->
    let! result = executeAgainstAuthoritativeState request
    socket.Send(BrowserRuntimeCodec.encodeActionResult result)
| Error _ ->
    match BrowserRuntimeCodec.decodeClient text with
    | Ok legacyFrame -> handleLegacyFrame legacyFrame
    | Error message -> rejectMalformedFrame message

Host 不得只收到 request 就回 Accepted。它必須先檢查 ExpectedDocumentRevision、完成 provider/resource prepare 與 authoritative swap，再回結果並發布新 revision。

authoritative document必須同時帶Rows與EditorSchemas。可修改row帶ptcs.dynamic.editor.binding.v1；client由document catalog生成Add/Edit表單，不接受host另外維護一份renderer-local schema registry。Edit request保留stable RowId，Host完成原位resource transition後以同一份new document revision發布row與binding。

Large initial frame batches

HTTP/Notebook host一次收到多個encoded RuntimeFrame時，不應在同一browser callback內同步decode、reduce、cache projection與write。使用frame pump先建立完整candidate，完成前不發布partial state：

let generation = currentGeneration

BrowserRuntimeFramePump.reduceIsolatedEncodedFrames
    response.Frames
    (fun () -> generation = currentGeneration)
    (function
        | BrowserRuntimeFramePumpOutcome.Applied candidate ->
            runtimeState.Value <- candidate

            BrowserRuntimeCache.writeAcceptedStatePhased
                cacheIdentity
                candidate
                (fun () -> generation = currentGeneration)
                ignore
        | BrowserRuntimeFramePumpOutcome.Rejected failure ->
            report failure.Code failure.Message
        | BrowserRuntimeFramePumpOutcome.Superseded -> ())

reduceFromEncodedFrames用於已有authoritative state的batch；reduceIsolatedEncodedFrames用於新run。每個frame的decode與reduce分屬不同animation-frame task，全部成功才回Applied。generation失效回Superseded；decode、resync或structured reducer denial回Rejected且保留last-good。writeAcceptedStatePhased再把finalized projection與IndexedDB encode/write分成兩個task，並於write開始前再驗generation。既有同步writeAcceptedState保留相容性，不適合大型initial state。

Production WebSocket OnMessage只enqueue；單一requestAnimationFrame pump依socket generation處理legacy frame或chunked start / item / commit。chunk framing與ordered batch transition由Contracts的RuntimeSnapshotTransportAssembler唯一決定；Interactive.Client只保留requestAnimationFrame分段SduiValue decode、canonical reducer與commit後publish，避免browser與machine consumer分叉協議。initial與reconnect producer都應先以RuntimeSnapshotTransportCodec.encodeFrames展開再flatten；invalid、stale或中斷batch保留last-good並只要求authoritative resync，不建立第二個pump。

Current owner candidate：PulseTrade.Comm.Spa.Dynamic.Interactive.Client 0.1.73，exact依賴Contracts [0.1.30]、Renderer [0.1.82]與FSharp.Core [10.1.400]；bundle manifest版本須與nuspec一致。此bundle包含RFC-0030 row-local single-line controls，並保留RFC-0029 marker/cursor/trace lifecycle。runtime frame仍沿用同一reducer/renderer，unknown kind/version與invalid candidate fail closed並保留last-good；authoritative remove由host RuntimeFrame提交。SPAA與DIB共用此bundle，不另做consumer overlay；真SPAA gate與public push pending。

RFC-0028 release為Interactive.Client 0.1.67，exact依賴Contracts [0.1.29]與Renderer [0.1.76]。bundle包含typed dark plot／Histogram polarity、fresh visibleBars initial viewport、固定24px marker OFI band、direct marker exact-slot precedence及overview淺灰／亮綠2px presentation。consumer只需升Contracts與Interactive.Client direct references，不新增Renderer direct reference。

RFC-0030 candidate為Interactive.Client 0.1.73，exact依賴Contracts [0.1.30]與Renderer [0.1.82]。Consumer只需升exact package graph，不應自行重排row controls或建立private CSS workaround。