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import type { Logger } from "pino";
import { tokens } from "../../registry/tokens.js";
import { Result } from "../../tr8-script/domain/utils/types.js";
import { DBSyncSignalStore } from "../store/DB-sync-signal-dlq.store.js";
import { SyncSignalEventDlq } from "../../sync-engine/domain/sync-events.js";
import { LarkNotificationService } from "../../commons/services/lark-notification.service.js";
@singleton()
@autoInjectable()
class SyncSignalEventDlqHandler {
constructor(
private readonly dbSyncSignalStore: DBSyncSignalStore,
@inject(tokens.Logger) private readonly logger: Logger,
private readonly larkNotification: LarkNotificationService,
) {}
async handle(event: SyncSignalEventDlq): Promise<Result<true, Error>> {
const getResult = await this.dbSyncSignalStore.get(
event.scriptId,
event.scriptType,
);
if (!getResult.ok) {
this.logger.error(
{ err: getResult.error },
"[SyncSignalDLQHandler] Failed to fetch existing DLQ record",
);
return { ok: false, error: getResult.error };
}
const existing = getResult.value;
const parsedError = new Error(event.error);
const isRetryable = this.isTransientError(parsedError);
let processedSuccessfully = false;
if (existing !== null) {
const retries = (existing.retries ?? 1) + 1;
const maxRetriesExceeded = retries > 5;
// Send Lark notification only once when max retries exceeded (retries exactly equals 6)
if (maxRetriesExceeded && retries === 6) {
this.logger.error(
`[SyncSignalDLQHandler] Max retries exceeded for script ID: ${event.scriptId}`,
{
scriptId: event.scriptId,
scriptType: event.scriptType,
retries,
error: event.error,
isRetryable,
},
);
// Send Lark alert (non-blocking)
await this.larkNotification.sendDLQMaxRetriesAlert({
service: "SyncSignal",
eventId: event.scriptId,
eventType: event.scriptType,
retries,
error: event.error,
bookId: event.bookId,
});
}
const updateResult = await this.dbSyncSignalStore.update(
existing.scriptId,
{
retries,
statusDlq: maxRetriesExceeded
? "FAILED"
: isRetryable
? "RETRYING"
: "FAILED",
nextRetryAt:
isRetryable && !maxRetriesExceeded
? new Date(Date.now() + 5 * 60 * 1000)
: undefined,
error: event.error,
},
);
if (!updateResult.ok) {
this.logger.error(
{ err: updateResult.error },
"[SyncSignalDLQHandler] Failed to update DLQ record",
);
return { ok: false, error: updateResult.error };
}
this.logger.warn(
`[SyncSignalDLQHandler] Updated DLQ event: scriptId=${
event.scriptId
}, retries=${retries}, status=${
maxRetriesExceeded
? "FAILED (MAX_RETRIES)"
: isRetryable
? "RETRYING"
: "FAILED"
}`,
);
processedSuccessfully = true;
} else {
// Send Lark notification for new permanent errors
if (!isRetryable) {
this.logger.error(
`[SyncSignalDLQHandler] Permanent failure detected for new script ID: ${event.scriptId}`,
{
scriptId: event.scriptId,
scriptType: event.scriptType,
retries: 0,
error: event.error,
isRetryable,
},
);
// Send Lark alert (non-blocking)
await this.larkNotification.sendDLQMaxRetriesAlert({
service: "SyncSignal",
eventId: event.scriptId,
eventType: event.scriptType,
retries: 0,
error: event.error,
bookId: event.bookId,
});
}
const saveResult = await this.dbSyncSignalStore.save({
...event,
statusDlq: isRetryable ? "RETRYING" : "FAILED",
retries: 0,
nextRetryAt: isRetryable
? new Date(Date.now() + 5 * 60 * 1000)
: undefined,
});
if (!saveResult.ok) {
this.logger.error(
{ err: saveResult.error },
"[SyncSignalDLQHandler] Failed to save new DLQ record",
);
return { ok: false, error: saveResult.error };
}
this.logger.info(
`[SyncSignalDLQHandler] Saved new DLQ event: scriptId=${
event.scriptId
}, status=${isRetryable ? "RETRYING" : "FAILED"}`,
);
processedSuccessfully = true;
}
// Throw error for permanent failures after all processing is complete
if (processedSuccessfully && !isRetryable) {
throw new Error(
`Permanent failure for SyncSignalEvent ${event.scriptId}: ${event.error}`,
);
}
return { ok: true, value: true };
}
private isTransientError(error: Error): boolean {
const transientPatterns = [
"ECONNRESET",
"timeout",
"ETIMEDOUT",
"ENOTFOUND",
];
return transientPatterns.some((pattern) => error.message.includes(pattern));
}
}
export { SyncSignalEventDlqHandler };
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