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chore: remove dead code from previous #815 fix attempts (#841)

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PR #840 fixed issue #815 in the Electron main process via
will-prevent-unload + preventDefault. The renderer-side workarounds
introduced by previous fix attempts (#642, #648) are no longer needed
and never had effect for their stated purpose.

Removed:
- configuration={ confirmExit: false } in DrawIoEmbed
  confirmExit is not a recognized draw.io config key (zero matches in
  jgraph/drawio source). This was always dead code.

- modified=0 / keepmodified=0 URL parameters
  Per drawio source (app.min.js:14898), these only suppress the
  post-save modified-flag clearing — they do not prevent edits from
  setting editor.modified=true. They were ineffective for blocking
  beforeunload prompts and actually prevented draw.io from clearing
  its modified flag after save.

- canPersist / canPersistChecked state and isIndexedDBUsable() probe
  Their only purpose was gating the dead config above. Removing them
  also removes a startup delay before the iframe renders.

- handleDrawioAutoSave wrapper
  After PR #780 stripped its body, it was a pure passthrough useCallback.
  Now passes handleDiagramAutoSave directly to onAutoSave.

- withDB / isClosingError / resetDBPromise / onversionchange / onclose
  / terminated handlers in lib/session-storage.ts and lib/template-storage.ts
  PR #648 added these to recover from 'IDBDatabase: connection is closing'
  errors that PR #642's first land caused via db.close() on the shared
  singleton. That bug was already fixed in c5de1a1 (re-land of #642),
  three minutes before PR #648 commits started. The retry handlers
  defend against multi-tab / version-change scenarios that cannot occur
  in this single-instance Electron app (requestSingleInstanceLock).
  template-storage.ts copied the same pattern when introduced by #773.

Verified:
- npx tsc --noEmit passes
- Manual test in dev mode: session save/load works, template create works,
  diagram-only persistence works.
This commit is contained in:
Dayuan Jiang
2026-05-21 08:37:14 +09:00
committed by GitHub
parent 5406778dd6
commit 2f2d75961d
3 changed files with 94 additions and 235 deletions
Download Patch File Download Diff File Expand all files Collapse all files

140
lib/session-storage.ts
View File

@@ -58,33 +58,6 @@ interface ChatSessionDB extends DBSchema {
// Database singleton
let dbPromise: Promise<IDBPDatabase<ChatSessionDB>> | null = null
const resetDBPromise = () => {
dbPromise = null
}
const isClosingError = (error: unknown): boolean => {
return (
error instanceof DOMException &&
error.name === "InvalidStateError" &&
/closing/i.test(error.message)
)
}
const withDB = async <T>(
action: (db: IDBPDatabase<ChatSessionDB>) => Promise<T>,
): Promise<T> => {
try {
const db = await getDB()
return await action(db)
} catch (error) {
if (isClosingError(error)) {
resetDBPromise()
const db = await getDB()
return await action(db)
}
throw error
}
}
async function getDB(): Promise<IDBPDatabase<ChatSessionDB>> {
if (!dbPromise) {
@@ -115,23 +88,7 @@ async function getDB(): Promise<IDBPDatabase<ChatSessionDB>> {
}
}
},
terminated() {
resetDBPromise()
},
})
dbPromise
.then((db) => {
db.onversionchange = () => {
db.close()
resetDBPromise()
}
db.onclose = () => {
resetDBPromise()
}
})
.catch(() => {
resetDBPromise()
})
}
return dbPromise
}
@@ -146,46 +103,31 @@ export function isIndexedDBAvailable(): boolean {
}
}
// Check if IndexedDB is actually usable (not just present).
// Note: Do NOT close the db here - getDB() returns a shared singleton connection
// that other code depends on.
export async function isIndexedDBUsable(): Promise<boolean> {
if (!isIndexedDBAvailable()) return false
try {
await getDB()
return true
} catch {
return false
}
}
// CRUD Operations
export async function getAllSessionMetadata(): Promise<SessionMetadata[]> {
if (!isIndexedDBAvailable()) return []
try {
return await withDB(async (db) => {
const tx = db.transaction(STORE_NAME, "readonly")
const index = tx.store.index("by-updated")
const metadata: SessionMetadata[] = []
const db = await getDB()
const tx = db.transaction(STORE_NAME, "readonly")
const index = tx.store.index("by-updated")
const metadata: SessionMetadata[] = []
// Use cursor to read only metadata fields (avoids loading full messages/XML)
let cursor = await index.openCursor(null, "prev") // newest first
while (cursor) {
const s = cursor.value
metadata.push({
id: s.id,
title: s.title,
createdAt: s.createdAt,
updatedAt: s.updatedAt,
messageCount: s.messages.length,
hasDiagram:
!!s.diagramXml && s.diagramXml.trim().length > 0,
thumbnailDataUrl: s.thumbnailDataUrl,
})
cursor = await cursor.continue()
}
return metadata
})
// Use cursor to read only metadata fields (avoids loading full messages/XML)
let cursor = await index.openCursor(null, "prev") // newest first
while (cursor) {
const s = cursor.value
metadata.push({
id: s.id,
title: s.title,
createdAt: s.createdAt,
updatedAt: s.updatedAt,
messageCount: s.messages.length,
hasDiagram: !!s.diagramXml && s.diagramXml.trim().length > 0,
thumbnailDataUrl: s.thumbnailDataUrl,
})
cursor = await cursor.continue()
}
return metadata
} catch (error) {
console.error("Failed to get session metadata:", error)
return []
@@ -195,9 +137,8 @@ export async function getAllSessionMetadata(): Promise<SessionMetadata[]> {
export async function getSession(id: string): Promise<ChatSession | null> {
if (!isIndexedDBAvailable()) return null
try {
return await withDB(async (db) => {
return (await db.get(STORE_NAME, id)) || null
})
const db = await getDB()
return (await db.get(STORE_NAME, id)) || null
} catch (error) {
console.error("Failed to get session:", error)
return null
@@ -207,9 +148,8 @@ export async function getSession(id: string): Promise<ChatSession | null> {
export async function saveSession(session: ChatSession): Promise<boolean> {
if (!isIndexedDBAvailable()) return false
try {
await withDB(async (db) => {
await db.put(STORE_NAME, session)
})
const db = await getDB()
await db.put(STORE_NAME, session)
return true
} catch (error) {
// Handle quota exceeded
@@ -221,9 +161,8 @@ export async function saveSession(session: ChatSession): Promise<boolean> {
await deleteOldestSession()
// Retry once
try {
await withDB(async (db) => {
await db.put(STORE_NAME, session)
})
const db = await getDB()
await db.put(STORE_NAME, session)
return true
} catch (retryError) {
console.error(
@@ -242,9 +181,8 @@ export async function saveSession(session: ChatSession): Promise<boolean> {
export async function deleteSession(id: string): Promise<void> {
if (!isIndexedDBAvailable()) return
try {
await withDB(async (db) => {
await db.delete(STORE_NAME, id)
})
const db = await getDB()
await db.delete(STORE_NAME, id)
} catch (error) {
console.error("Failed to delete session:", error)
}
@@ -253,9 +191,8 @@ export async function deleteSession(id: string): Promise<void> {
export async function getSessionCount(): Promise<number> {
if (!isIndexedDBAvailable()) return 0
try {
return await withDB(async (db) => {
return await db.count(STORE_NAME)
})
const db = await getDB()
return await db.count(STORE_NAME)
} catch (error) {
console.error("Failed to get session count:", error)
return 0
@@ -265,15 +202,14 @@ export async function getSessionCount(): Promise<number> {
export async function deleteOldestSession(): Promise<void> {
if (!isIndexedDBAvailable()) return
try {
await withDB(async (db) => {
const tx = db.transaction(STORE_NAME, "readwrite")
const index = tx.store.index("by-updated")
const cursor = await index.openCursor()
if (cursor) {
await cursor.delete()
}
await tx.done
})
const db = await getDB()
const tx = db.transaction(STORE_NAME, "readwrite")
const index = tx.store.index("by-updated")
const cursor = await index.openCursor()
if (cursor) {
await cursor.delete()
}
await tx.done
} catch (error) {
console.error("Failed to delete oldest session:", error)
}