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import { LedgerEventDlq } from "../../tr8-script/domain/ledger-event.js";
import { DBLedgerDlqStore } from "../store/DB-ledger-event-dlq.store.js";
import type { Logger } from "pino";
import { tokens } from "../../registry/tokens.js";
import { Result } from "../../tr8-script/domain/utils/types.js";
import { LarkNotificationService } from "../../commons/services/lark-notification.service.js";
@singleton()
@autoInjectable()
class LedgerEventDlqHandler {
constructor(
private readonly DBLedgerDlqStore: DBLedgerDlqStore,
@inject(tokens.Logger) private readonly logger: Logger,
private readonly larkNotification: LarkNotificationService,
) {}
async handle(ledgerEvent: LedgerEventDlq): Promise<Result<true, Error>> {
const getResult = await this.DBLedgerDlqStore.get(
ledgerEvent.scriptId,
ledgerEvent.subId,
ledgerEvent.type,
);
if (!getResult.ok) {
this.logger.error(
{ err: getResult.error },
"[LedgerEventDLQHandler] Failed to fetch existing DLQ record",
);
return { ok: false, error: getResult.error };
}
const existing = getResult.value;
const parsedError = new Error(ledgerEvent.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(
`[LedgerEventDLQHandler] Max retries exceeded for script ID: ${ledgerEvent.scriptId}`,
{
scriptId: ledgerEvent.scriptId,
subId: ledgerEvent.subId,
eventType: ledgerEvent.type,
retries,
error: ledgerEvent.error,
isRetryable,
},
);
// Send Lark alert (non-blocking)
await this.larkNotification.sendDLQMaxRetriesAlert({
service: "LedgerEvent",
eventId: ledgerEvent.scriptId,
eventType: ledgerEvent.type,
retries,
error: ledgerEvent.error,
});
}
const updateResult = await this.DBLedgerDlqStore.update(existing.id, {
retries,
status: maxRetriesExceeded
? "FAILED"
: isRetryable
? "RETRYING"
: "FAILED",
nextRetryAt:
isRetryable && !maxRetriesExceeded
? new Date(Date.now() + 5 * 60 * 1000)
: undefined,
error: ledgerEvent.error,
});
if (!updateResult.ok) {
this.logger.error(
{ err: updateResult.error },
"[LedgerEventDLQHandler] Failed to update DLQ record",
);
return { ok: false, error: updateResult.error };
}
this.logger.warn(
`[LedgerEventDLQHandler] Updated existing DLQ event: scriptId=${
ledgerEvent.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(
`[LedgerEventDLQHandler] Permanent failure detected for new script ID: ${ledgerEvent.scriptId}`,
{
scriptId: ledgerEvent.scriptId,
subId: ledgerEvent.subId,
eventType: ledgerEvent.type,
retries: 0,
error: ledgerEvent.error,
isRetryable,
},
);
// Send Lark alert (non-blocking)
await this.larkNotification.sendDLQMaxRetriesAlert({
service: "LedgerEvent",
eventId: ledgerEvent.scriptId,
eventType: ledgerEvent.type,
retries: 0,
error: ledgerEvent.error,
});
}
// no existing record: create new
const saveResult = await this.DBLedgerDlqStore.save({
...ledgerEvent,
status: isRetryable ? "RETRYING" : "FAILED",
retries: 0,
nextRetryAt: isRetryable
? new Date(Date.now() + 5 * 60 * 1000)
: undefined,
});
if (!saveResult.ok) {
this.logger.error(
{ err: saveResult.error },
"[LedgerEventDLQHandler] Failed to save new DLQ record",
);
return { ok: false, error: saveResult.error };
}
this.logger.info(
`[LedgerEventDLQHandler] Saved new DLQ event: scriptId=${
ledgerEvent.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 LedgerEvent ${ledgerEvent.scriptId}: ${ledgerEvent.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 { LedgerEventDlqHandler };
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