From 03c62f7c9f54664e47f2f5018d63f2e54d719da0 Mon Sep 17 00:00:00 2001
From: Ethan <leonsch98@tutamail.com>
Date: Sat, 22 Aug 2026 11:34:31 +0100
Subject: [PATCH 1/2] Fix event polling to fetch and emit new events

## Description
### Problem

`packages/interfold-sdk/src/events/event-listener.ts` had a bug in `pollForEvents():` it only advanced `lastBlockNumber` without fetching or emitting logs. As a result, `startEventPolling()` could never trigger event callbacks.

This contradicts the documented behavior in `docs/pages/sdk.mdx`, which states that `sdk.startEventPolling()` can be used to poll logs over HTTP when WebSockets are unavailable.

### Fix
- Fetch historical events for each subscribed event type between the last and current block.
- Emit fetched logs through the existing `emit()` pipeline.
- Extract `buildEvent()` to share event construction between polling and WebSocket watchers.
- Advance `lastBlockNumber` only after successful event processing.

The existing event tests in `packages/interfold-sdk/tests/events.test.ts` confirm that emitted events are delivered to registered callbacks.
---
 .../src/events/event-listener.ts              | 44 ++++++++++++-------
 1 file changed, 28 insertions(+), 16 deletions(-)

diff --git a/packages/interfold-sdk/src/events/event-listener.ts b/packages/interfold-sdk/src/events/event-listener.ts
index dfaf651c58..b2651afc89 100644
--- a/packages/interfold-sdk/src/events/event-listener.ts
+++ b/packages/interfold-sdk/src/events/event-listener.ts
@@ -105,19 +105,7 @@ export class EventListener implements SDKEventEmitter {
             for (let i = 0; i < logs.length; i++) {
               const log = logs[i]
               if (!log) break
-              const event: InterfoldEvent<T> = {
-                type: eventType,
-                data: (log as unknown as { args: unknown }).args as T extends InterfoldEventTypeT
-                  ? InterfoldEventData[T]
-                  : T extends RegistryEventTypeT
-                    ? RegistryEventData[T]
-                    : unknown,
-                log,
-                timestamp: new Date(),
-                blockNumber: log.blockNumber ?? BigInt(0),
-                transactionHash: log.transactionHash ?? '0x',
-              }
-              emitter.emit(event)
+              emitter.emit(emitter.buildEvent(eventType, log))
             }
           },
         })
@@ -129,6 +117,21 @@ export class EventListener implements SDKEventEmitter {
     }
   }
 
+  private buildEvent<T extends AllEventTypes>(eventType: T, log: Log): InterfoldEvent<T> {
+    return {
+      type: eventType,
+      data: (log as unknown as { args: unknown }).args as T extends InterfoldEventTypeT
+        ? InterfoldEventData[T]
+        : T extends RegistryEventTypeT
+          ? RegistryEventData[T]
+          : unknown,
+      log,
+      timestamp: new Date(),
+      blockNumber: log.blockNumber ?? BigInt(0),
+      transactionHash: log.transactionHash ?? '0x',
+    }
+  }
+
   public async watchLogs(address: `0x${string}`, callback: (log: Log) => void): Promise<void> {
     const watcherKey = `logs:${address}`
 
@@ -249,11 +252,21 @@ export class EventListener implements SDKEventEmitter {
     while (this.isPolling) {
       try {
         const currentBlock = await this.publicClient.getBlockNumber()
-
+  
         if (currentBlock > this.lastBlockNumber) {
+          const fromBlock = this.lastBlockNumber + BigInt(1)
+  
+          for (const eventType of this.listeners.keys()) {
+            const logs = await this.getHistoricalEvents(eventType, fromBlock, currentBlock)
+  
+            for (const log of logs) {
+              this.emit(this.buildEvent(eventType, log))
+            }
+          }
+  
           this.lastBlockNumber = currentBlock
         }
-
+  
         await sleep(this.config.pollingInterval || 5000)
       } catch (error) {
         console.error('Error during polling:', error)
@@ -261,4 +274,3 @@ export class EventListener implements SDKEventEmitter {
       }
     }
   }
-}

From bf209261373d451f82cce55a78551b85f8238d02 Mon Sep 17 00:00:00 2001
From: Ethan <leonsch98@tutamail.com>
Date: Wed, 26 Aug 2026 07:24:45 +0100
Subject: [PATCH 2/2] Add missing newline at end of event-listener.ts

---
 packages/interfold-sdk/src/events/event-listener.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/interfold-sdk/src/events/event-listener.ts b/packages/interfold-sdk/src/events/event-listener.ts
index b2651afc89..bd4f482b3a 100644
--- a/packages/interfold-sdk/src/events/event-listener.ts
+++ b/packages/interfold-sdk/src/events/event-listener.ts
@@ -274,3 +274,4 @@ export class EventListener implements SDKEventEmitter {
       }
     }
   }
+}