Make remote and log resource ownership explicit

devs.md

@@ -277,6 +277,8 @@ The scenario uses only fixed in-memory inputs. It does not read or write the Vau
 - Dev mode creates `ls-debug/` folder in `.obsidian/` for debug outputs (e.g., missing translations)
     - This causes pretty significant performance overhead.
 
+`ModuleLog` owns an `OwnedResource<LogFunction>` for its `API.addLog.setHandler` registration and keeps service log input in a per-instance buffer. The host wraps the complete asynchronous `control.onUnload()` in `withOwnedResource`. On successful shutdown, the handler and its global and per-instance observers remain registered through the final database close and final unload log. If `control.onUnload()` rejects, `withOwnedResource` releases them when the operation settles. Do not release it from an `onBeforeUnload` or module `onUnload` handler; both run before the host's complete unload finishes. The import-time global `Logger` bridge and display and report histories remain shared, while service log calls stay with their owning instance.
+
 #### Diagnostic and notice ownership
 
 - A Commonlib or service operation should normally record detailed diagnostics at `LOG_LEVEL_VERBOSE` and return a typed result which lets its caller distinguish complete, partial, and failed outcomes. Do not make callers infer an outcome by parsing log text.

package.json

@@ -100,6 +100,7 @@
         "test:e2e:obsidian:customisation-sync": "tsx test/e2e-obsidian/scripts/customisation-sync.ts",
         "test:e2e:obsidian:customisation-catalogue-reload": "tsx test/e2e-obsidian/scripts/customisation-catalogue-reload.ts",
         "test:e2e:obsidian:optional-file-save-completion": "tsx test/e2e-obsidian/scripts/optional-file-save-completion.ts",
+        "test:e2e:obsidian:log-lifecycle": "tsx test/e2e-obsidian/scripts/log-lifecycle.ts",
         "test:e2e:obsidian:livesync-batch": "tsx test/e2e-obsidian/scripts/issue1207-livesync-batch.ts",
         "test:e2e:obsidian:received-change-readiness": "tsx test/e2e-obsidian/scripts/received-change-readiness.ts",
         "test:e2e:obsidian:remote-feature-change": "tsx test/e2e-obsidian/scripts/remote-feature-change.ts",

src/common/ownedRemoteResource.ts

@@ -1,3 +1,5 @@
+import { withOwnedResource, type DisposableResource } from "octagonal-wheels/resource";
+
 /**
  * Run a finite operation with a flow-owned remote resource and release it
  * after either success or failure.
@@ -6,13 +8,9 @@
  * caller's ownership boundary explicit and prevents finite flows from leaking
  * a provider-owned resource when their operation rejects.
  */
-export async function withOwnedRemoteResource<TResource extends { dispose(): Promise<void> }, TResult>(
+export function withOwnedRemoteResource<TResource extends DisposableResource & { dispose(): Promise<void> }, TResult>(
     resource: TResource,
     operation: (ownedResource: TResource) => Promise<TResult>
 ): Promise<TResult> {
-    try {
-        return await operation(resource);
-    } finally {
-        await resource.dispose();
-    }
+    return withOwnedResource(resource, operation);
 }

src/common/ownedRemoteResource.unit.spec.ts

@@ -26,3 +26,47 @@ describe("flow-owned remote resources", () => {
         expect(dispose).toHaveBeenCalledOnce();
     });
 });
+
+describe("owned remote resource completion", () => {
+    it("waits for cleanup and preserves its receiver", async () => {
+        let finish!: () => void;
+        let started!: () => void;
+        const disposing = new Promise<void>((resolve) => {
+            started = resolve;
+        });
+        const cleanup = new Promise<void>((resolve) => {
+            finish = resolve;
+        });
+        const resource = {
+            dispose: vi.fn(function (this: unknown) {
+                expect(this).toBe(resource);
+                started();
+                return cleanup;
+            }),
+        };
+        let settled = false;
+        const result = withOwnedRemoteResource(resource, async () => "done");
+        void result.then(() => {
+            settled = true;
+        });
+        await disposing;
+        expect(settled).toBe(false);
+        finish();
+        await expect(result).resolves.toBe("done");
+        expect(resource.dispose).toHaveBeenCalledOnce();
+    });
+
+    it("keeps finally precedence when both the operation and cleanup fail", async () => {
+        const operationError = new Error("operation");
+        const disposalError = new Error("cleanup");
+        const dispose = vi.fn(async () => {
+            throw disposalError;
+        });
+        await expect(
+            withOwnedRemoteResource({ dispose }, async () => {
+                throw operationError;
+            })
+        ).rejects.toBe(disposalError);
+        expect(dispose).toHaveBeenCalledOnce();
+    });
+});

src/common/replicatorProviders.ts

@@ -73,7 +73,7 @@ async function runOneShotWithOutcome(
 
 // Manual and unattended wrappers share the provider transfer operation, but
 // keep interaction authority and result presentation explicit at this boundary.
-const couchDBUserInitiatedOneShot: UserInitiatedOneShotRunner = async (instance, setting, request) => {
+const userInitiatedOneShot: UserInitiatedOneShotRunner = async (instance, setting, request) => {
     return await runOneShotWithOutcome(
         instance,
         setting,
@@ -81,20 +81,7 @@ const couchDBUserInitiatedOneShot: UserInitiatedOneShotRunner = async (instance,
     );
 };
 
-const couchDBUnattendedOneShot: UnattendedOneShotRunner = async (instance, setting, request) => {
-    if (request.interaction.kind !== NO_INTERACTION.kind) return replicationBlocked("interaction-required");
-    return await runOneShotWithOutcome(instance, setting, false);
-};
-
-const objectStorageUserInitiatedOneShot: UserInitiatedOneShotRunner = async (instance, setting, request) => {
-    return await runOneShotWithOutcome(
-        instance,
-        setting,
-        request.progressPresentation === REPLICATION_PROGRESS_PRESENTATIONS.NOTICE
-    );
-};
-
-const objectStorageUnattendedOneShot: UnattendedOneShotRunner = async (instance, setting, request) => {
+const unattendedOneShot: UnattendedOneShotRunner = async (instance, setting, request) => {
     if (request.interaction.kind !== NO_INTERACTION.kind) return replicationBlocked("interaction-required");
     return await runOneShotWithOutcome(instance, setting, false);
 };
@@ -136,8 +123,8 @@ export function createCentralReplicatorProviderDefinitions(
                 ),
             },
             centralRemoteAdministration: COUCHDB_CENTRAL_REMOTE_ADMINISTRATION_CAPABILITY,
-            userInitiatedOneShot: supportedCapability(couchDBUserInitiatedOneShot),
-            unattendedOneShot: supportedCapability(couchDBUnattendedOneShot),
+            userInitiatedOneShot: supportedCapability(userInitiatedOneShot),
+            unattendedOneShot: supportedCapability(unattendedOneShot),
             continuous: supportedOpenReplicationContinuous(),
             stopActiveTransfer: supportedStopActiveTransfer(),
         },
@@ -166,8 +153,8 @@ export function createCentralReplicatorProviderDefinitions(
                 [REMOTE_RESOURCE_KINDS.INITIAL_FETCH_FAST_FORWARD]: CAPABILITY_NOT_APPLICABLE,
             },
             centralRemoteAdministration: OBJECT_STORAGE_CENTRAL_REMOTE_ADMINISTRATION_CAPABILITY,
-            userInitiatedOneShot: supportedCapability(objectStorageUserInitiatedOneShot),
-            unattendedOneShot: supportedCapability(objectStorageUnattendedOneShot),
+            userInitiatedOneShot: supportedCapability(userInitiatedOneShot),
+            unattendedOneShot: supportedCapability(unattendedOneShot),
             continuous: CAPABILITY_NOT_APPLICABLE,
             stopActiveTransfer: supportedStopActiveTransfer(),
         },

src/common/replicatorProviders.unit.spec.ts

@@ -209,6 +209,37 @@ describe("central Replicator provider definitions", () => {
         expect(openOneShotReplicationWithOutcome).toHaveBeenNthCalledWith(2, setting, true);
     });
 
+    it.each([REMOTE_COUCHDB, REMOTE_MINIO] as const)(
+        "keeps unattended %s work quiet and rejects interaction before opening replication",
+        async (remoteType) => {
+            const definition = createCentralReplicatorProviderDefinitions({} as never).get(remoteType)!;
+            if (definition.unattendedOneShot.kind !== CAPABILITY_SUPPORT_KINDS.SUPPORTED) {
+                throw new Error("Unattended OneShot is unavailable");
+            }
+            const setting = Object.assign(createNewVaultSettings(), { remoteType });
+            const instance = {
+                initializeDatabaseForReplication: vi.fn(async () => true),
+                openReplication: vi.fn(async () => true),
+                terminateSync: vi.fn(),
+                closeReplication: vi.fn(),
+                openOneShotReplicationWithOutcome: vi.fn(async () => REPLICATION_COMPLETED),
+            };
+            const blocked = await definition.unattendedOneShot.run(instance, setting, {
+                trigger: "resume",
+                interaction: USER_INITIATED_REPLICATION_AUTHORITY,
+            } as never);
+            expect(blocked).toEqual({ status: "blocked", reason: "interaction-required" });
+            expect(instance.openOneShotReplicationWithOutcome).not.toHaveBeenCalled();
+            await expect(
+                definition.unattendedOneShot.run(instance, setting, {
+                    trigger: "resume",
+                    interaction: NO_INTERACTION,
+                })
+            ).resolves.toBe(REPLICATION_COMPLETED);
+            expect(instance.openOneShotReplicationWithOutcome).toHaveBeenCalledExactlyOnceWith(setting, false);
+        }
+    );
+
     it("dispatches central finite work through the declared operation rather than constructor identity", async () => {
         const definitions = createCentralReplicatorProviderDefinitions({} as never);
         const couchDB = definitions.get(REMOTE_COUCHDB)!;

src/common/replicatorResources/shared.ts

@@ -1,3 +1,4 @@
+import { createOwnedResource } from "octagonal-wheels/resource";
 import type { RemoteDBSettings } from "@vrtmrz/livesync-commonlib/compat/common/types";
 
 /**
@@ -13,13 +14,8 @@ export interface ResourceReplicator {
 
 /** Create one idempotent asynchronous disposer for a private Replicator. */
 export function createReplicatorDisposer(replicator: ResourceReplicator): () => Promise<void> {
-    let disposal: Promise<void> | undefined;
-    return () => {
-        if (disposal === undefined) {
-            disposal = Promise.resolve().then(() => replicator.closeReplication());
-        }
-        return disposal;
-    };
+    const resource = createOwnedResource(replicator, (owned) => Promise.resolve().then(() => owned.closeReplication()));
+    return () => Promise.resolve(resource.dispose());
 }
 
 /** Fence a finite resource from later edits to its source settings object. */

src/common/replicatorResources/shared.unit.spec.ts

@@ -0,0 +1,42 @@
+import { describe, expect, it, vi } from "vitest";
+import { createReplicatorDisposer } from "./shared";
+
+describe("Replicator disposal", () => {
+    it("defers closing, preserves the receiver, and retains one completion promise", async () => {
+        let finish!: () => void;
+        const closed = new Promise<void>((resolve) => {
+            finish = resolve;
+        });
+        const replicator = {
+            closeReplication: vi.fn(function (this: unknown) {
+                expect(this).toBe(replicator);
+                return closed;
+            }),
+        };
+        const dispose = createReplicatorDisposer(replicator);
+        const pending = dispose();
+        expect(replicator.closeReplication).not.toHaveBeenCalled();
+        expect(dispose()).toBe(pending);
+        await Promise.resolve();
+        expect(replicator.closeReplication).toHaveBeenCalledOnce();
+        finish();
+        await pending;
+        expect(dispose()).toBe(pending);
+        expect(replicator.closeReplication).toHaveBeenCalledOnce();
+    });
+
+    it("retains synchronous closing failures as one rejected promise", async () => {
+        const error = new Error("close");
+        const replicator = {
+            closeReplication: vi.fn(() => {
+                throw error;
+            }),
+        };
+        const dispose = createReplicatorDisposer(replicator);
+        const pending = dispose();
+        await expect(pending).rejects.toBe(error);
+        expect(dispose()).toBe(pending);
+        await expect(dispose()).rejects.toBe(error);
+        expect(replicator.closeReplication).toHaveBeenCalledOnce();
+    });
+});

src/main.onunload.unit.spec.ts

@@ -0,0 +1,114 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { createOwnedResource } from "octagonal-wheels/resource";
+import { LOG_LEVEL_URGENT } from "octagonal-wheels/common/logger";
+import { bindableFunction } from "@vrtmrz/livesync-commonlib/compat/services/lib/HandlerUtils";
+
+const unusedStartupDependencies: readonly [string, readonly string[]][] = [
+    ["@/serviceFeatures/useP2PSettingsPreparation", ["useP2PSettingsPreparation"]],
+    ["@vrtmrz/livesync-commonlib/compat/common/coreEnvFunctions", ["setGetLanguage"]],
+    ["./features/LiveSyncCommands.ts", ["LiveSyncCommands"]],
+    ["./features/HiddenFileSync/CmdHiddenFileSync.ts", ["HiddenFileSync"]],
+    ["./features/ConfigSync/CmdConfigSync.ts", ["ConfigSync"]],
+    ["./modules/features/ModuleLog.ts", ["ModuleLog"]],
+    ["./modules/essentialObsidian/ModuleObsidianEvents.ts", ["ModuleObsidianEvents"]],
+    ["./modules/features/ModuleObsidianSettingTab.ts", ["ModuleObsidianSettingDialogue"]],
+    ["./modules/features/ModuleObsidianDocumentHistory.ts", ["ModuleObsidianDocumentHistory"]],
+    ["./modules/features/ModuleGlobalHistory.ts", ["ModuleObsidianGlobalHistory"]],
+    ["./features/LocalDatabaseMainte/CmdLocalDatabaseMainte.ts", ["LocalDatabaseMaintenance"]],
+    ["./modules/services/ObsidianServiceHub.ts", ["ObsidianServiceHub"]],
+    ["@vrtmrz/livesync-commonlib/compat/serviceModules/Rebuilder", ["ServiceRebuilder"]],
+    ["@/serviceModules/DatabaseFileAccess.ts", ["ServiceDatabaseFileAccess"]],
+    ["@/serviceModules/ServiceFileAccessImpl.ts", ["ServiceFileAccessObsidian"]],
+    ["@vrtmrz/livesync-commonlib/compat/managers/StorageProcessingManager", ["StorageAccessManager"]],
+    ["./serviceModules/FileHandler.ts", ["ServiceFileHandler"]],
+    ["./serviceModules/FileAccessObsidian.ts", ["FileAccessObsidian"]],
+    ["./managers/StorageEventManagerObsidian.ts", ["StorageEventManagerObsidian"]],
+    ["@vrtmrz/livesync-commonlib/compat/mock_and_interop/wrapper", ["setNoticeClass"]],
+    ["./LiveSyncBaseCore.ts", ["LiveSyncBaseCore"]],
+    ["./modules/features/ModuleObsidianSettingAsMarkdown.ts", ["ModuleObsidianSettingsAsMarkdown"]],
+    ["./modules/features/SetupManager.ts", ["SetupManager"]],
+    ["./serviceFeatures/onLayoutReady/enablei18n.ts", ["enableI18nFeature"]],
+    ["@vrtmrz/livesync-commonlib/compat/serviceFeatures/offlineScanner", ["useOfflineScanner"]],
+    ["@vrtmrz/livesync-commonlib/compat/serviceFeatures/remoteConfig", ["useRemoteConfiguration"]],
+    ["@vrtmrz/livesync-commonlib/compat/serviceFeatures/checkRemoteSize", ["useCheckRemoteSize"]],
+    ["./serviceFeatures/redFlag.ts", ["useRedFlagFeatures"]],
+    ["./serviceFeatures/setupObsidian/setupProtocol.ts", ["useSetupProtocolFeature"]],
+    ["@/serviceFeatures/setupObsidian/qrCode", ["useSetupQRCodeFeature"]],
+    ["@/serviceFeatures/setupObsidian/setupUri", ["useSetupURIFeature"]],
+    [
+        "./serviceFeatures/setupObsidian/setupManagerHandlers.ts",
+        ["showOnboardingInvitation", "useSetupManagerHandlersFeature"],
+    ],
+    ["@vrtmrz/livesync-commonlib/p2p", ["useP2PReplicatorCommands", "useP2PReplicatorFeature"]],
+    ["./serviceFeatures/useP2PReplicatorUI.ts", ["useP2PReplicatorUI"]],
+    ["./serviceFeatures/useReviewHarness.ts", ["useReviewHarness"]],
+    ["./features/P2PSync/P2PReplicator/P2PReplicationUI.ts", ["createOpenReplicationUI", "createOpenRebuildUI"]],
+    ["./serviceFeatures/compatibilityReview.ts", ["useCompatibilityReview"]],
+    ["./serviceFeatures/compatibilityReviewObsidian.ts", ["createObsidianCompatibilityReviewUi"]],
+    ["./serviceModules/FileReflectionProvenance.ts", ["createFileReflectionProvenance"]],
+    ["./serviceFeatures/interactiveConflictResolution", ["useInteractiveConflictResolutionFeature"]],
+    ["./modules/features/InteractiveConflictResolving/ConflictResolveModal.ts", ["ConflictResolveModal"]],
+    ["./serviceFeatures/obsidianReplicationRibbon.ts", ["useObsidianReplicationRibbonFeature"]],
+    ["./serviceFeatures/startupLifecycle", ["useStartupLifecycleFeature"]],
+    ["./serviceFeatures/useJoinedDevices", ["useJoinedDevicesFeature"]],
+    ["./serviceFeatures/useDatabaseDiagnostics", ["useDatabaseDiagnosticsFeature"]],
+];
+
+beforeEach(() => {
+    vi.resetModules();
+    vi.doMock("./deps", () => ({ Plugin: class {}, Notice: class {}, getLanguage: () => "en" }));
+    for (const [specifier, names] of unusedStartupDependencies) {
+        vi.doMock(specifier, () => Object.fromEntries(names.map((name) => [name, vi.fn()])));
+    }
+});
+
+describe("Obsidian plug-in unload logging", () => {
+    it.each(["complete", "fail"] as const)(
+        "retains its log connection through shutdown and retires it afterwards: %s",
+        async (outcome) => {
+            const { default: LiveSyncPlugin } = await import("./main.ts");
+            const events: string[] = [];
+            const sink = vi.fn((message: unknown) => events.push(String(message)));
+            const addLog = bindableFunction<(message: unknown, level?: number, key?: string) => void>("unload log");
+            const unregister = addLog.setHandler(sink);
+            const dispose = vi.fn(() => {
+                unregister();
+                events.push("disposed");
+            });
+            const logResource = createOwnedResource(sink, dispose);
+            let finish!: () => void;
+            let fail!: (reason: Error) => void;
+            const shutdown = new Promise<void>((resolve, reject) => {
+                finish = resolve;
+                fail = reject;
+            });
+            const onUnload = vi.fn(() => shutdown);
+            const core = {
+                getModule: vi.fn(() => ({ logResource })),
+                services: { API: { addLog }, control: { onUnload } },
+            };
+
+            expect(LiveSyncPlugin.prototype.onunload.call({ core } as never)).toBeUndefined();
+            expect(onUnload).toHaveBeenCalledTimes(1);
+            expect(dispose).not.toHaveBeenCalled();
+            addLog("during shutdown");
+
+            const failure = new Error("database close failed");
+            if (outcome === "fail") {
+                fail(failure);
+            } else {
+                finish();
+            }
+            await vi.waitFor(() => expect(dispose).toHaveBeenCalledTimes(1));
+
+            if (outcome === "fail") {
+                const message = "Failed to unload Self-hosted LiveSync: " + String(failure);
+                expect(sink).toHaveBeenCalledWith(message, LOG_LEVEL_URGENT, "shutdown");
+                expect(events).toEqual(["during shutdown", message, "disposed"]);
+            } else {
+                expect(events).toEqual(["during shutdown", "disposed"]);
+            }
+            expect(() => addLog("after shutdown")).toThrow("not assigned");
+        }
+    );
+});

src/main.ts

@@ -9,6 +9,7 @@ import { ConfigSync } from "./features/ConfigSync/CmdConfigSync.ts";
 // import { ModuleDev } from "./modules/extras/ModuleDev.ts";
 
 import { ModuleLog } from "./modules/features/ModuleLog.ts";
+import { withOwnedResource } from "octagonal-wheels/resource";
 import { ModuleObsidianEvents } from "./modules/essentialObsidian/ModuleObsidianEvents.ts";
 import { ModuleObsidianSettingDialogue } from "./modules/features/ModuleObsidianSettingTab.ts";
 import { ModuleObsidianDocumentHistory } from "./modules/features/ModuleObsidianDocumentHistory.ts";
@@ -234,12 +235,14 @@ export default class ObsidianLiveSyncPlugin extends Plugin {
         void this._startUp();
     }
     override onunload(): void {
-        void this.core.services.control.onUnload().catch((error) => {
+        void withOwnedResource(this.core.getModule(ModuleLog).logResource, () =>
+            this.core.services.control.onUnload().catch((error) => {
                 this.core.services.API.addLog(
                     "Failed to unload Self-hosted LiveSync: " + String(error),
                     LOG_LEVEL_URGENT,
                     "shutdown"
                 );
-        });
+            })
+        );
     }
 }

src/modules/features/ModuleLog.ts

@@ -1,4 +1,10 @@
-import { computed, reactive, reactiveSource, type ReactiveValue } from "octagonal-wheels/dataobject/reactive";
+import {
+    computed,
+    reactive,
+    reactiveSource,
+    type ReactiveSource,
+    type ReactiveValue,
+} from "octagonal-wheels/dataobject/reactive";
 import {
     LOG_LEVEL_DEBUG,
     LOG_LEVEL_INFO,
@@ -7,6 +13,7 @@ import {
     type LOG_LEVEL,
 } from "@vrtmrz/livesync-commonlib/compat/common/types";
 import { scheduleTask } from "octagonal-wheels/concurrency/task";
+import { createOwnedResource, type OwnedResource } from "octagonal-wheels/resource";
 import { fireAndForget, isDirty, throttle } from "@vrtmrz/livesync-commonlib/compat/common/utils";
 import {
     chunkFetchCounts,
@@ -46,7 +53,11 @@ import {
     isValidFilenameInDarwin,
     isValidFilenameInWidows,
 } from "@vrtmrz/livesync-commonlib/compat/string_and_binary/path";
-import { MARK_LOG_NETWORK_ERROR, MARK_LOG_SEPARATOR } from "@vrtmrz/livesync-commonlib/compat/services/lib/logUtils";
+import {
+    MARK_LOG_NETWORK_ERROR,
+    MARK_LOG_SEPARATOR,
+    type LogFunction,
+} from "@vrtmrz/livesync-commonlib/compat/services/lib/logUtils";
 import { NetworkWarningStyles } from "@vrtmrz/livesync-commonlib/compat/common/models/setting.const";
 import { compatGlobal } from "@vrtmrz/livesync-commonlib/compat/common/coreEnvFunctions";
 import { generateReport } from "@/common/reportTool.ts";
@@ -57,9 +68,8 @@ import {
 
 // This module cannot be a core module because it depends on the Obsidian UI.
 
-// DI the log again.
-const recentLogEntries = reactiveSource<LogEntry[]>([]);
-const globalLogFunction = (message: unknown, level?: number, key?: string) => {
+function createBufferedLog(entries: ReactiveSource<LogEntry[]>) {
+    return (message: unknown, level?: number, key?: string) => {
         const messageX =
             message instanceof Error
                 ? new LiveSyncError("[Error Logged]: " + message.message, { cause: message })
@@ -67,10 +77,13 @@ const globalLogFunction = (message: unknown, level?: number, key?: string) => {
                   ? message
                   : JSON.stringify(message);
         const entry = { message: messageX, level, key } as LogEntry;
-    recentLogEntries.value = [...recentLogEntries.value, entry];
-};
+        entries.value = [...entries.value, entry];
+    };
+}
 
-setGlobalLogFunction(globalLogFunction);
+// Legacy Logger calls use this shared buffer; service logs use their owner's buffer.
+const recentGlobalLogEntries = reactiveSource<LogEntry[]>([]);
+setGlobalLogFunction(createBufferedLog(recentGlobalLogEntries));
 // Keep the recent logs in memory for display, but also keep a longer history in logForDump for when the user wants to see more logs.
 // logForDump is not reactive and is only used for dumping logs when requested, while recentLogs is reactive and is used for displaying logs in the UI.
 const logForDump = [] as string[];
@@ -113,6 +126,16 @@ function redactLog(log: string) {
 const showDebugLog = false;
 export const MARK_DONE = "\u{2009}\u{2009}";
 export class ModuleLog extends AbstractObsidianModule {
+    /** The host releases this connection after the complete asynchronous unload. */
+    logResource!: OwnedResource<LogFunction>;
+    private readonly recentLogEntries = reactiveSource<LogEntry[]>([]);
+    private readonly displayLogEntries = () => {
+        if (this.recentLogEntries.value.length === 0) return;
+        const entries = [...this.recentLogEntries.value];
+        this.recentLogEntries.value = [];
+        entries.forEach((entry) => this.__addLog(entry.message, entry.level, entry.key));
+    };
+
     statusBar?: HTMLElement;
 
     statusDiv?: HTMLElement;
@@ -460,12 +483,7 @@ ${stringifyYaml(info)}
         return Promise.resolve(true);
     }
     private _everyOnloadAfterLoadSettings(): Promise<boolean> {
-        recentLogEntries.onChanged((entries) => {
-            if (entries.value.length === 0) return;
-            const newEntries = [...entries.value];
-            recentLogEntries.value = [];
-            newEntries.forEach((e) => this.__addLog(e.message, e.level, e.key));
-        });
+        this.recentLogEntries.onChanged(this.displayLogEntries);
         eventHub.onEvent(EVENT_FILE_RENAMED, (data) => {
             void this.setFileStatus();
         });
@@ -597,7 +615,22 @@ ${stringifyYaml(info)}
         }
     }
     override onBindFunction(core: LiveSyncCore, services: typeof core.services): void {
-        services.API.addLog.setHandler(globalLogFunction);
+        const log = createBufferedLog(this.recentLogEntries);
+        const unregisterLog = services.API.addLog.setHandler(log);
+        const collectGlobalLogs = () => {
+            const entries = recentGlobalLogEntries.value;
+            if (entries.length === 0) return;
+            recentGlobalLogEntries.value = [];
+            this.recentLogEntries.value = [...this.recentLogEntries.value, ...entries];
+        };
+        this.logResource = createOwnedResource(log, () => {
+            unregisterLog();
+            recentGlobalLogEntries.offChanged(collectGlobalLogs);
+            this.recentLogEntries.offChanged(this.displayLogEntries);
+            this.recentLogEntries.value = [];
+        });
+        recentGlobalLogEntries.onChanged(collectGlobalLogs);
+        collectGlobalLogs();
         services.appLifecycle.onInitialise.addHandler(this._everyOnloadStart.bind(this));
         services.appLifecycle.onSettingLoaded.addHandler(this._everyOnloadAfterLoadSettings.bind(this));
         services.appLifecycle.onLoaded.addHandler(this._everyOnload.bind(this));

src/modules/features/ModuleLog.unit.spec.ts

@@ -0,0 +1,228 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+vi.mock("@/deps.ts", () => ({
+    addIcon: vi.fn(),
+    debounce: (callback: () => void) => callback,
+    normalizePath: (path: string) => path,
+    Notice: class {},
+    stringifyYaml: vi.fn(),
+}));
+vi.mock("./Log/LogPaneView.ts", () => ({ LogPaneView: class {}, VIEW_TYPE_LOG: "log" }));
+vi.mock("@/common/reportTool.ts", () => ({ generateReport: vi.fn() }));
+vi.mock("@/common/utils.ts", () => ({ isValidPath: () => true }));
+vi.mock("@/common/translation", () => ({ $msg: (key: string) => key }));
+vi.mock("@/common/events.ts", () => ({
+    EVENT_FILE_RENAMED: "renamed",
+    EVENT_LAYOUT_READY: "ready",
+    EVENT_LEAF_ACTIVE_CHANGED: "active",
+    EVENT_ON_UNRESOLVED_ERROR: "error",
+    eventHub: { onEvent: vi.fn() },
+}));
+vi.mock("@vrtmrz/livesync-commonlib/compat/replication/trystero/P2PLogCollector", () => ({
+    P2PLogCollector: class {},
+}));
+
+async function createHarness() {
+    const { ModuleLog } = await import("./ModuleLog.ts");
+    const { bindableFunction, allFunction } =
+        await import("@vrtmrz/livesync-commonlib/compat/services/lib/HandlerUtils");
+    const services = {
+        API: {
+            addLog: bindableFunction<(message: unknown, level?: number, key?: string) => void>("log"),
+            addCommand: vi.fn(),
+            registerWindow: vi.fn(),
+            addRibbonIcon: vi.fn(),
+            registerProtocolHandler: vi.fn(),
+        },
+        context: { events: {}, notices: { hide: vi.fn() } },
+        appLifecycle: {
+            onInitialise: allFunction<() => Promise<boolean>>(),
+            onSettingLoaded: allFunction<() => Promise<boolean>>(),
+            onLoaded: allFunction<() => Promise<boolean>>(),
+            onBeforeUnload: allFunction<() => Promise<boolean>>(),
+        },
+    };
+    const core = { services, settings: {} };
+    const module = new ModuleLog({ app: {} } as never, core as never);
+    const sink = vi.spyOn(module, "__addLog").mockImplementation(() => undefined);
+    vi.spyOn(module, "observeForLogs").mockImplementation(() => undefined);
+    vi.spyOn(module, "adjustStatusDivPosition").mockImplementation(() => undefined);
+    module.onBindFunction(core as never, services as never);
+    const { Logger } = await import("octagonal-wheels/common/logger");
+    return { module, services, sink, Logger };
+}
+
+describe("ModuleLog service connection", () => {
+    beforeEach(() => {
+        vi.resetModules();
+        vi.stubGlobal("document", { querySelectorAll: () => [] });
+    });
+    afterEach(() => {
+        vi.unstubAllGlobals();
+    });
+
+    it("buffers startup logs and preserves global and service call order", async () => {
+        const { services, sink, Logger } = await createHarness();
+        Logger("before-global");
+        services.API.addLog("before-service", 32, "startup");
+        Logger("between-global");
+        expect(sink).not.toHaveBeenCalled();
+        await services.appLifecycle.onSettingLoaded();
+        const messages = sink.mock.calls.map(([message]) => message);
+        expect(messages.filter((message) => typeof message === "string" && /^(before|between)-/.test(message))).toEqual(
+            ["before-global", "before-service", "between-global"]
+        );
+        expect(sink).toHaveBeenCalledWith("before-service", 32, "startup");
+    });
+
+    it("delivers service logs only to their own module", async () => {
+        const first = await createHarness();
+        const second = await createHarness();
+        await first.services.appLifecycle.onSettingLoaded();
+        await second.services.appLifecycle.onSettingLoaded();
+        first.sink.mockClear();
+        second.sink.mockClear();
+
+        first.services.API.addLog("first", 32, "first-key");
+        second.services.API.addLog("second", 64, "second-key");
+        expect(first.sink.mock.calls).toEqual([["first", 32, "first-key"]]);
+        expect(second.sink.mock.calls).toEqual([["second", 64, "second-key"]]);
+    });
+
+    it("preserves message conversion, levels, keys, and error causes", async () => {
+        const { services, sink } = await createHarness();
+        await services.appLifecycle.onSettingLoaded();
+        sink.mockClear();
+        const error = new Error("failed");
+        services.API.addLog(error, 128, "failure");
+        services.API.addLog({ result: "value" }, 32, "object");
+        services.API.addLog("plain");
+        const converted = sink.mock.calls[0][0] as Error & { cause: unknown };
+        expect(converted.message).toBe("[Error Logged]: failed");
+        expect(converted.cause).toBe(error);
+        expect(sink.mock.calls[0].slice(1)).toEqual([128, "failure"]);
+        expect(sink.mock.calls.slice(1)).toEqual([
+            ['{"result":"value"}', 32, "object"],
+            ["plain", undefined, undefined],
+        ]);
+    });
+
+    it("detaches both service registration and legacy subscription on disposal", async () => {
+        const first = await createHarness();
+        const second = await createHarness();
+        await first.services.appLifecycle.onSettingLoaded();
+        await second.services.appLifecycle.onSettingLoaded();
+        first.sink.mockClear();
+        second.sink.mockClear();
+
+        await first.module.logResource.dispose();
+        await first.module.logResource.dispose();
+        expect(() => first.services.API.addLog("retired")).toThrow("not assigned");
+        second.services.API.addLog("active", 32, "service");
+        first.Logger("legacy-after-retirement", 32, "legacy");
+        expect(first.sink).not.toHaveBeenCalled();
+        expect(second.sink.mock.calls).toEqual([
+            ["active", 32, "service"],
+            ["legacy-after-retirement", 32, "legacy"],
+        ]);
+        await second.module.logResource.dispose();
+    });
+
+    it("leaves a replacement service handler registered when the old owner is disposed", async () => {
+        const { services, module, sink, Logger } = await createHarness();
+        await services.appLifecycle.onSettingLoaded();
+        const replacement = vi.fn();
+        services.API.addLog.setHandler(replacement, true);
+        sink.mockClear();
+
+        await module.logResource.dispose();
+        await module.logResource.dispose();
+        services.API.addLog("replacement", 32, "key");
+        Logger("detached-legacy");
+        expect(replacement).toHaveBeenCalledExactlyOnceWith("replacement", 32, "key");
+        expect(sink).not.toHaveBeenCalled();
+    });
+
+    it("releases a connection which never reached the settings-loaded phase", async () => {
+        const { services, module, sink, Logger } = await createHarness();
+        services.API.addLog("pending");
+        await module.logResource.dispose();
+        Logger("after-disposal");
+        expect(sink).not.toHaveBeenCalled();
+        expect(() => services.API.addLog("retired")).toThrow("not assigned");
+
+        const replacement = await createHarness();
+        await replacement.services.appLifecycle.onSettingLoaded();
+        const messages = replacement.sink.mock.calls.map(([message]) => message);
+        expect(messages).toContain("after-disposal");
+        expect(messages).not.toContain("pending");
+        await replacement.module.logResource.dispose();
+    });
+
+    it.each(["complete", "fail"] as const)(
+        "keeps logging through asynchronous database shutdown and releases after it: %s",
+        async (outcome) => {
+            const { services, module, sink, Logger } = await createHarness();
+            await services.appLifecycle.onSettingLoaded();
+            sink.mockClear();
+            const { ControlService } = await import("@vrtmrz/livesync-commonlib/compat/services/base/ControlService");
+            const { ServiceContext } = await import("@vrtmrz/livesync-commonlib/context");
+            const { withOwnedResource } = await import("octagonal-wheels/resource");
+            let finish!: () => void;
+            let fail!: (reason: Error) => void;
+            let started!: () => void;
+            const closing = new Promise<void>((resolve) => {
+                started = resolve;
+            });
+            const closed = new Promise<void>((resolve, reject) => {
+                finish = resolve;
+                fail = reject;
+            });
+            const control = new ControlService(new ServiceContext({ translate: (key) => key }), {
+                appLifecycleService: {
+                    ...services.appLifecycle,
+                    onAppUnload: vi.fn(async () => []),
+                    onUnload: vi.fn(async () => {
+                        services.API.addLog("lifecycle-unload");
+                        return true;
+                    }),
+                },
+                APIService: services.API,
+                databaseService: {
+                    localDatabaseDirect: {
+                        onunload: vi.fn(() => services.API.addLog("database-unload")),
+                        close: vi.fn(() => {
+                            started();
+                            return closed;
+                        }),
+                    },
+                },
+            } as never);
+
+            const unloading = withOwnedResource(module.logResource, () => control.onUnload());
+            await closing;
+            services.API.addLog("during-close");
+            expect(sink.mock.calls.map(([message]) => message)).toEqual([
+                "lifecycle-unload",
+                "database-unload",
+                "during-close",
+            ]);
+            if (outcome === "fail") {
+                const failure = new Error("database close failed");
+                const rejected = expect(unloading).rejects.toBe(failure);
+                fail(failure);
+                await rejected;
+            } else {
+                finish();
+                await unloading;
+                expect(sink.mock.calls[sink.mock.calls.length - 1][0]).toContain(
+                    "moduleLiveSyncMain.logUnloadingPlugin"
+                );
+            }
+            expect(() => services.API.addLog("retired")).toThrow("not assigned");
+            sink.mockClear();
+            Logger("after-unload");
+            expect(sink).not.toHaveBeenCalled();
+        }
+    );
+});

src/serviceFeatures/useJoinedDevices.ts

@@ -9,6 +9,7 @@ import {
 import { REMOTE_RESOURCE_KINDS, type JoinedDevicesSnapshot } from "@vrtmrz/livesync-commonlib/replication";
 import type { ObsidianNoticeGroups } from "@/modules/services/ObsidianNoticeGroups";
 import JoinedDevicesDialog from "@/modules/services/LiveSyncUI/dialogues/JoinedDevicesDialog.svelte";
+import { withOwnedRemoteResource } from "@/common/ownedRemoteResource";
 import {
     getCouchDBReplicatorConfigurationIdentity,
     getObjectStorageReplicatorConfigurationIdentity,
@@ -119,9 +120,9 @@ export function useJoinedDevicesFeature(host: JoinedDevicesHost, notices: Obsidi
                     settings
                 );
                 if (!resource) throw new Error("Joined devices are unavailable");
-                try {
+                return withOwnedRemoteResource(resource, async (ownedResource) => {
                     assertCurrent();
-                    const snapshot = await resource.read();
+                    const snapshot = await ownedResource.read();
                     assertCurrent();
                     notify(snapshot, id, identity!);
                     return joinedDevicesView(snapshot, {
@@ -130,9 +131,7 @@ export function useJoinedDevicesFeature(host: JoinedDevicesHost, notices: Obsidi
                         pluginVersion: services.API.getPluginVersion(),
                         appVersion: services.API.getAppVersion(),
                     });
-                } finally {
-                    await resource.dispose();
-                }
+                });
             },
             forget: async (id) => {
                 if (id === (await ownId())) throw new Error("This device cannot be forgotten");
@@ -141,14 +140,12 @@ export function useJoinedDevicesFeature(host: JoinedDevicesHost, notices: Obsidi
                     settings
                 );
                 if (!resource) throw new Error("Joined devices are unavailable");
-                try {
+                return withOwnedRemoteResource(resource, async (ownedResource) => {
                     assertCurrent();
-                    const result = await resource.forget(id);
+                    const result = await ownedResource.forget(id);
                     assertCurrent();
                     return result;
-                } finally {
-                    await resource.dispose();
-                }
+                });
             },
             cancel: () => controller.abort(),
         };

src/serviceFeatures/useJoinedDevices.unit.spec.ts

@@ -110,6 +110,67 @@ describe("joined devices service feature", () => {
         expect(await pending).toEqual({ status: "handled", value: "closed" });
         await expect(options.refresh()).rejects.toThrow();
     });
+    it("propagates a failed refresh after releasing its resource", async () => {
+        const data = fixture();
+        const failure = new Error("joined devices read failed");
+        data.read.mockRejectedValueOnce(failure);
+        const { options, pending } = await open(data);
+
+        await expect(options.refresh()).rejects.toBe(failure);
+        expect(data.dispose).toHaveBeenCalledOnce();
+        data.close();
+        await pending;
+    });
+    it.each(["refresh", "forget"] as const)(
+        "waits for resource disposal after %s",
+        async (operationName) => {
+            const data = fixture();
+            let finishDisposal!: () => void;
+            data.dispose.mockImplementationOnce(
+                () =>
+                    new Promise<void>((resolve) => {
+                        finishDisposal = resolve;
+                    })
+            );
+            const { options, pending } = await open(data);
+            const operation = operationName === "refresh" ? options.refresh() : options.forget("other");
+            let settled = false;
+            void operation.then(
+                () => {
+                    settled = true;
+                },
+                () => {
+                    settled = true;
+                }
+            );
+
+            await vi.waitFor(() => expect(data.dispose).toHaveBeenCalledOnce());
+            expect(settled).toBe(false);
+            finishDisposal();
+            await expect(operation).resolves.toBeDefined();
+            expect(settled).toBe(true);
+            data.close();
+            await pending;
+        }
+    );
+    it.each(["refresh", "forget"] as const)(
+        "uses disposal failure precedence when %s also fails",
+        async (operationName) => {
+            const data = fixture();
+            const operationFailure = new Error("joined devices operation failed");
+            const disposalFailure = new Error("joined devices disposal failed");
+            if (operationName === "refresh") data.read.mockRejectedValueOnce(operationFailure);
+            else data.forget.mockRejectedValueOnce(operationFailure);
+            data.dispose.mockRejectedValueOnce(disposalFailure);
+            const { options, pending } = await open(data);
+            const operation = operationName === "refresh" ? options.refresh() : options.forget("other");
+
+            await expect(operation).rejects.toBe(disposalFailure);
+            expect(data.dispose).toHaveBeenCalledOnce();
+            data.close();
+            await pending;
+        }
+    );
     it("prevents self removal and fences an old dialogue after a remote switch", async () => {
         const data = fixture();
         const { options, pending } = await open(data);

test/e2e-obsidian/scripts/log-lifecycle.ts

@@ -0,0 +1,373 @@
+import { createHash, randomUUID } from "node:crypto";
+import { readFile, writeFile } from "node:fs/promises";
+import { join } from "node:path";
+import { LOG_LEVEL_URGENT } from "octagonal-wheels/common/logger";
+import { evalObsidianJson } from "../runner/cli.ts";
+import { requireObsidianBinary, requireObsidianCli } from "../runner/environment.ts";
+import {
+    createE2eCouchDbPluginData,
+    createE2eObsidianDeviceLocalState,
+    waitForLiveSyncCoreReady,
+} from "../runner/liveSyncWorkflow.ts";
+import { startObsidianLiveSyncSession, type ObsidianLiveSyncSession } from "../runner/session.ts";
+import { createTemporaryVault, type TemporaryVault } from "../runner/vault.ts";
+
+process.env.E2E_OBSIDIAN_CLI_TIMEOUT_MS ??= "60000";
+
+type FixtureLog = {
+    message: string;
+    level?: number;
+    key?: string;
+};
+
+type ShutdownObservation = {
+    closeCalls: number;
+    disposeCalls: number;
+    disposeCompleted: boolean;
+    fixtureLogs: FixtureLog[];
+    events: string[];
+};
+
+async function evaluate<T>(cliBinary: string, session: ObsidianLiveSyncSession, body: string): Promise<T> {
+    return await evalObsidianJson<T>(
+        cliBinary,
+        `(async()=>{
+            const require=(condition,message)=>{if(!condition)throw new Error(message);};
+            const waitFor=async(predicate,message)=>{
+                const until=Date.now()+15000;
+                while(!predicate()) {
+                    if(Date.now()>until)throw new Error(message);
+                    await new Promise(resolve=>setTimeout(resolve,20));
+                }
+            };
+            ${body}
+        })()`,
+        session.cliEnv
+    );
+}
+
+function createPluginData(dbName: string): Record<string, unknown> {
+    return createE2eCouchDbPluginData(
+        { uri: "http://127.0.0.1:1", username: "unused", password: "unused", dbName },
+        {
+            syncInternalFiles: true,
+            usePluginSync: true,
+            usePluginSyncV2: true,
+            deviceAndVaultName: "log-lifecycle-device",
+            autoSweepPlugins: false,
+            autoSweepPluginsPeriodic: false,
+            syncInternalFilesInterval: 0,
+            liveSync: false,
+            periodicReplication: false,
+            syncOnStart: false,
+            syncOnSave: false,
+            syncOnFileOpen: false,
+            syncOnEditorSave: false,
+            syncAfterMerge: false,
+            showVerboseLog: true,
+        }
+    );
+}
+
+async function startSession(
+    binary: string,
+    cliBinary: string,
+    vault: TemporaryVault
+): Promise<ObsidianLiveSyncSession> {
+    const session = await startObsidianLiveSyncSession({
+        binary,
+        cliBinary,
+        vault,
+        pluginData: createPluginData(`log-lifecycle-${vault.name}`),
+        localStorageEntries: createE2eObsidianDeviceLocalState(vault.name),
+        lifecycle: {
+            beforeLaunch: async () => {
+                const registryPath = join(vault.userDataPath, "obsidian.json");
+                const registry = JSON.parse(await readFile(registryPath, "utf8"));
+                registry.updateDisabled = true;
+                await writeFile(registryPath, JSON.stringify(registry));
+            },
+        },
+    });
+    return session;
+}
+
+function createShutdownScript(options: {
+    duringMarker: string;
+    failureMarker: string;
+    reloadMarker: string;
+    injectFailure: boolean;
+    urgentLevel: number;
+}): string {
+    const fixtures = JSON.stringify(options);
+    return `
+        const fixtures=${fixtures};
+        const plugin=app.plugins.plugins["obsidian-livesync"];
+        const core=plugin?.core;
+        require(core,"The LiveSync plug-in did not expose its core");
+        const module=core.modules.find(candidate=>candidate.constructor.name==="ModuleLog");
+        require(module,"The loaded core did not contain ModuleLog");
+        const api=core.services.API;
+        const database=core.services.database.localDatabaseDirect;
+        require(database,"The loaded core did not expose its local database");
+
+        let releaseCloseGate;
+        const closeGate=new Promise(resolve=>{releaseCloseGate=resolve;});
+        const state={
+            core,
+            api,
+            module,
+            fixtureLogs:[],
+            events:[],
+            closeStarted:false,
+            closeCalls:0,
+            disposeCalls:0,
+            disposeCompleted:false,
+            closeGateReleased:false,
+            disableError:"",
+        };
+        app.__livesyncLogLifecycleState=state;
+
+        const originalAddLog=module.__addLog;
+        module.__addLog=function(message,level,key) {
+            if(typeof message==="string" && [
+                fixtures.duringMarker,
+                fixtures.failureMarker,
+                fixtures.reloadMarker
+            ].some(marker=>marker && message.includes(marker))) {
+                state.fixtureLogs.push({message,level,key});
+                const marker=[fixtures.duringMarker,fixtures.failureMarker,fixtures.reloadMarker]
+                    .find(candidate=>candidate && message.includes(candidate));
+                state.events.push("log:"+marker);
+            }
+            return originalAddLog.apply(this,arguments);
+        };
+
+        const resource=module.logResource;
+        const originalDispose=resource.dispose;
+        resource.dispose=async function() {
+            state.disposeCalls++;
+            state.events.push("dispose-start");
+            try {
+                return await originalDispose.apply(this,arguments);
+            } finally {
+                state.disposeCompleted=true;
+                state.events.push("dispose-complete");
+            }
+        };
+
+        const originalClose=database.close;
+        database.close=async function() {
+            state.closeCalls++;
+            if(state.closeCalls===1) {
+                state.closeStarted=true;
+                state.events.push("close-start");
+                await closeGate;
+            }
+            const result=await originalClose.apply(this,arguments);
+            if(state.closeCalls===1) {
+                state.events.push("close-finished");
+                if(fixtures.injectFailure) {
+                    state.events.push("close-failure-injected");
+                    throw new Error(fixtures.failureMarker);
+                }
+            }
+            return result;
+        };
+
+        state.restore=()=>{
+            module.__addLog=originalAddLog;
+            resource.dispose=originalDispose;
+            database.close=originalClose;
+        };
+
+        const run=async()=>{
+            state.disablePromise=app.plugins.disablePlugin("obsidian-livesync");
+            state.disablePromise.catch(error=>{state.disableError=String(error);});
+            await waitFor(()=>state.closeStarted,"The real local database close did not start");
+            require(state.disposeCalls===0 && !state.disposeCompleted,
+                "The log resource was released before database shutdown completed");
+            api.addLog(fixtures.duringMarker,undefined,"e2e-log-lifecycle-during-close");
+            await waitFor(
+                ()=>state.fixtureLogs.some(entry=>entry.message.includes(fixtures.duringMarker)),
+                "ModuleLog did not receive the during-close log"
+            );
+            require(state.disposeCalls===0,"The log resource was released while database close was gated");
+            releaseCloseGate();
+            state.closeGateReleased=true;
+            await waitFor(()=>state.disposeCompleted,"The log resource was not released after database close");
+
+            require(state.closeCalls===1,"The local database close was not observed exactly once");
+            require(state.disposeCalls===1,"The log resource was not disposed exactly once");
+            require(state.events.indexOf("close-finished")>=0 &&
+                state.events.indexOf("close-finished")<state.events.indexOf("dispose-start"),
+                "The log resource was disposed before the local database close completed");
+
+            const failedLog=fixtures.failureMarker
+                ? state.fixtureLogs.find(entry=>entry.message.includes(fixtures.failureMarker))
+                : undefined;
+            if(fixtures.injectFailure) {
+                require(failedLog,"The injected post-close failure was not logged");
+                require(failedLog.key==="shutdown","The shutdown failure log used the wrong key");
+                require(failedLog.level===fixtures.urgentLevel,"The shutdown failure log was not urgent");
+                require(
+                    state.events.indexOf("close-finished")<state.events.indexOf("log:"+fixtures.failureMarker) &&
+                    state.events.indexOf("log:"+fixtures.failureMarker)<state.events.indexOf("dispose-start"),
+                    "The shutdown failure was not logged between database close and log resource disposal"
+                );
+            } else {
+                require(!failedLog,"The normal shutdown unexpectedly reported the injected failure");
+            }
+
+            let detached=false;
+            try {
+                api.addLog("e2e-log-lifecycle-after-disposal");
+            } catch(error) {
+                detached=String(error).includes("not assigned");
+            }
+            require(detached,"The old API log handler remained assigned after disposal");
+            await state.disablePromise;
+            require(!state.disableError,"Disabling the plug-in failed: "+state.disableError);
+            return JSON.stringify({
+                closeCalls:state.closeCalls,
+                disposeCalls:state.disposeCalls,
+                disposeCompleted:state.disposeCompleted,
+                fixtureLogs:state.fixtureLogs,
+                events:state.events
+            });
+        };
+
+        try {
+            return await run();
+        } finally {
+            releaseCloseGate();
+            if(state.closeStarted && !state.disposeCompleted) {
+                try {
+                    await waitFor(()=>state.disposeCompleted,"Cleanup timed out waiting for log resource disposal");
+                } catch {}
+            }
+        }
+    `;
+}
+
+async function runCase(options: {
+    binary: string;
+    cliBinary: string;
+    caseName: string;
+    injectFailure: boolean;
+}): Promise<Record<string, unknown>> {
+    const vault = await createTemporaryVault(`obsidian-log-lifecycle-${options.caseName}-`);
+    let session: ObsidianLiveSyncSession | undefined;
+    const markers = {
+        duringMarker: `log-lifecycle-${options.caseName}-during-${randomUUID()}`,
+        failureMarker: options.injectFailure
+            ? `log-lifecycle-${options.caseName}-injected-close-failure-${randomUUID()}`
+            : "",
+        reloadMarker: options.injectFailure ? "" : `log-lifecycle-${options.caseName}-reload-${randomUUID()}`,
+        injectFailure: options.injectFailure,
+        urgentLevel: LOG_LEVEL_URGENT,
+    };
+
+    try {
+        session = await startSession(options.binary, options.cliBinary, vault);
+        await waitForLiveSyncCoreReady(options.cliBinary, session.cliEnv);
+        const shutdown = await evaluate<ShutdownObservation>(options.cliBinary, session, createShutdownScript(markers));
+        if (options.injectFailure) {
+            return { caseName: options.caseName, shutdown };
+        }
+
+        await evaluate(
+            options.cliBinary,
+            session,
+            `await app.plugins.enablePlugin("obsidian-livesync"); return JSON.stringify({enabled:true});`
+        );
+        await waitForLiveSyncCoreReady(options.cliBinary, session.cliEnv);
+        const reload = await evaluate<Record<string, unknown>>(
+            options.cliBinary,
+            session,
+            `
+                const state=app.__livesyncLogLifecycleState;
+                require(state,"The old core observation was not retained across plug-in reload");
+                const plugin=app.plugins.plugins["obsidian-livesync"];
+                const core=plugin?.core;
+                require(core && core!==state.core,"Enabling the plug-in did not create a new core");
+                const module=core.modules.find(candidate=>candidate.constructor.name==="ModuleLog");
+                require(module,"The reloaded core did not contain ModuleLog");
+                const originalAddLog=module.__addLog;
+                const observed=[];
+                module.__addLog=function(message,level,key) {
+                    if(typeof message==="string" && message.includes(${JSON.stringify(markers.reloadMarker)})) {
+                        observed.push({message,level,key});
+                    }
+                    return originalAddLog.apply(this,arguments);
+                };
+                try {
+                    core.services.API.addLog(${JSON.stringify(markers.reloadMarker)},undefined,"e2e-log-lifecycle-reload");
+                    await waitFor(()=>observed.length>0,"The reloaded ModuleLog did not receive its API log");
+                    require(observed.length===1,"The reloaded ModuleLog received the fixture log more than once");
+                    require(
+                        !state.fixtureLogs.some(entry=>entry.message.includes(${JSON.stringify(markers.reloadMarker)})),
+                        "The old ModuleLog observer received the reloaded core's fixture log"
+                    );
+                    let oldHandlerDetached=false;
+                    try {
+                        state.api.addLog("e2e-log-lifecycle-reloaded-old-api");
+                    } catch(error) {
+                        oldHandlerDetached=String(error).includes("not assigned");
+                    }
+                    require(oldHandlerDetached,"The old API log handler was reassigned after reload");
+                    return JSON.stringify({
+                        coreChanged:core!==state.core,
+                        observedByNewModule:observed.length,
+                        observedByOldModule:state.fixtureLogs.filter(
+                            entry=>entry.message.includes(${JSON.stringify(markers.reloadMarker)})
+                        ).length
+                    });
+                } finally {
+                    module.__addLog=originalAddLog;
+                    state.restore();
+                    delete app.__livesyncLogLifecycleState;
+                }
+            `
+        );
+        return { caseName: options.caseName, shutdown, reload };
+    } finally {
+        if (session) {
+            try {
+                await evaluate(
+                    options.cliBinary,
+                    session,
+                    `
+                        const state=app.__livesyncLogLifecycleState;
+                        state?.restore?.();
+                        delete app.__livesyncLogLifecycleState;
+                        return JSON.stringify({cleaned:true});
+                    `
+                );
+            } catch {}
+            try {
+                await session.app.stop();
+            } finally {
+                await vault.dispose();
+            }
+        } else {
+            await vault.dispose();
+        }
+    }
+}
+
+async function main(): Promise<void> {
+    const binary = requireObsidianBinary();
+    const cliBinary = requireObsidianCli();
+    const bundleHash = createHash("sha256")
+        .update(new Uint8Array(await readFile("main.js")))
+        .digest("hex");
+
+    const observations = [
+        await runCase({ binary, cliBinary, caseName: "normal", injectFailure: false }),
+        await runCase({ binary, cliBinary, caseName: "controlled-failure", injectFailure: true }),
+    ];
+    console.log(JSON.stringify({ ok: true, bundleHash, observations }, null, 2));
+}
+
+await main();

test/e2e-obsidian/scripts/run-focused.ts

@@ -49,6 +49,7 @@ const focusedScenarios = new Set([
     "customisation-sync",
     "customisation-catalogue-reload",
     "optional-file-save-completion",
+    "log-lifecycle",
     "livesync-batch",
     "received-change-readiness",
     "internal-metadata-doctor",

updates.md

@@ -12,6 +12,11 @@ Earlier releases remain available in the 1.0 release history, the 1.0 preview hi
 
 ## Unreleased
 
+### Diagnostics
+
+- Service log calls stay with the plug-in instance that registered them. Its log connection is released after the full shutdown, so stale instances cannot receive later service messages.
+
+
 ## 1.0.42
 
 27th October, 2026