Resolve "Feat(SSE): Add msgpackr parser for SSE Client"

packages/stack/src/utils/sse-client-msgpackr.ts

@@ -0,0 +1,54 @@
+import { SSEClient, SSEClientOptions, SSEvent } from './sse-client';
+
+import { unpackMultiple } from 'msgpackr';
+
+/**
+ * SSEClientMsgpackr is a subclass of SSEClient that uses msgpackr to parse the events.
+ */
+export class SSEClientMsgpackr extends SSEClient {
+
+    /**
+   * Creates a new SSEClientMsgpackr instance.
+   * @param {string} url The URL to connect to
+   * @param {SSEClientOptions} options The options for the SSEClient
+   * @returns {SSEClientMsgpackr} A new SSEClientMsgpackr instance
+   */
+  public static async from(url: string, options: SSEClientOptions) {
+    const client = new SSEClientMsgpackr(url, options);
+    await client.connect();
+    return client;
+  }
+
+  /**
+   * Parses the events from the msgpackr message buffer.
+   * @param {Uint8Array} chunk The chunk to parse
+   * @returns {SSEvent[]} The parsed events
+   */
+  protected parseEvents(chunk: Uint8Array): SSEvent[] {
+    // Append new chunk to existing buffer
+    this.messageBuffer = new Uint8Array([...this.messageBuffer, ...chunk]);
+
+    // Create an array to store the parsed events
+    const events: SSEvent[] = [];
+
+    try {
+      // Try to decode the entire buffer as msgPackr messages
+      unpackMultiple(this.messageBuffer, (value, start, end) => {
+        // Remove the event from the buffer
+        this.messageBuffer = this.messageBuffer.slice(end);
+
+        // Add the event to the events array
+        events.push(value);
+      });
+    } catch (error) {
+      // If we can't decode the buffer, it might be incomplete
+      // Keep the entire buffer for next time
+    } finally {
+      // Update buffer with any remaining unprocessed content
+      this.messageBuffer = new Uint8Array(this.messageBuffer);
+
+      // Return the events
+      return events;
+    }
+  }
+}