feat: add dashdot integration (#1541)

packages/redis/src/lib/channel.ts

@@ -187,6 +187,67 @@ export const createItemChannel = <TData>(itemId: string) => {
   return createChannelWithLatestAndEvents<TData>(`item:${itemId}`);
 };
 
+export const createChannelEventHistory = <TData>(channelName: string, maxElements = 15) => {
+  const popElementsOverMaxAsync = async () => {
+    const length = await getSetClient.llen(channelName);
+    if (length <= maxElements) {
+      return;
+    }
+    await getSetClient.ltrim(channelName, length - maxElements, length);
+  };
+
+  return {
+    subscribe: (callback: (data: TData) => void) => {
+      return ChannelSubscriptionTracker.subscribe(channelName, (message) => {
+        callback(superjson.parse(message));
+      });
+    },
+    publishAndPushAsync: async (data: TData) => {
+      await publisher.publish(channelName, superjson.stringify(data));
+      await getSetClient.lpush(channelName, superjson.stringify({ data, timestamp: new Date() }));
+      await popElementsOverMaxAsync();
+    },
+    pushAsync: async (data: TData) => {
+      await getSetClient.lpush(channelName, superjson.stringify({ data, timestamp: new Date() }));
+      await popElementsOverMaxAsync();
+    },
+    clearAsync: async () => {
+      await getSetClient.del(channelName);
+    },
+    getLastAsync: async () => {
+      const length = await getSetClient.llen(channelName);
+      const data = await getSetClient.lrange(channelName, length - 1, length);
+      if (data.length !== 1) return null;
+
+      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      return superjson.parse<{ data: TData; timestamp: Date }>(data[0]!);
+    },
+    getSliceAsync: async (startIndex: number, endIndex: number) => {
+      const range = await getSetClient.lrange(channelName, startIndex, endIndex);
+      return range.map((item) => superjson.parse<{ data: TData; timestamp: Date }>(item));
+    },
+    getSliceUntilTimeAsync: async (time: Date) => {
+      const length = await getSetClient.llen(channelName);
+      const items: TData[] = [];
+      const itemsInCollection = await getSetClient.lrange(channelName, 0, length - 1);
+
+      for (let i = 0; i < length - 1; i++) {
+        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+        const deserializedItem = superjson.parse<{ data: TData; timestamp: Date }>(itemsInCollection[i]!);
+        if (deserializedItem.timestamp < time) {
+          continue;
+        }
+        items.push(deserializedItem.data);
+      }
+      return items;
+    },
+    getLengthAsync: async () => {
+      return await getSetClient.llen(channelName);
+    },
+    name: channelName,
+  };
+};
+
 export const createChannelWithLatestAndEvents = <TData>(channelName: string) => {
   return {
     subscribe: (callback: (data: TData) => void) => {