fix: BinaryEncoding did not encode/decode the Clear message type (#38)

Author: gkachru

packages/bentocache/src/bus/encoders/binary_encoder.ts

@@ -30,6 +30,18 @@ export class BinaryEncoder implements TransportEncoder {
     this.#busIdLength = busIdLength
   }
 
+  protected busMessageTypeToNum(type: CacheBusMessageType): number {
+    if (type === CacheBusMessageType.Set) return 0x01
+    if (type === CacheBusMessageType.Clear) return 0x02
+    return 0x03
+  }
+
+  protected numToBusMessageType(num: number): CacheBusMessageType {
+    if (num === 0x01) return CacheBusMessageType.Set
+    if (num === 0x02) return CacheBusMessageType.Clear
+    return CacheBusMessageType.Delete
+  }
+
   /**
    * Encode the given message into a Buffer
    */
@@ -59,7 +71,7 @@ export class BinaryEncoder implements TransportEncoder {
     /**
      * 2. write the message type. 0x01 for 'Set' message, and 0x02 for a 'Delete' message
      */
-    buffer.writeUInt8(payload.type === CacheBusMessageType.Set ? 0x01 : 0x02, this.#busIdLength)
+    buffer.writeUInt8(this.busMessageTypeToNum(payload.type), this.#busIdLength)
 
     /**
      * 3. Write the keys
@@ -100,7 +112,7 @@ export class BinaryEncoder implements TransportEncoder {
      * Then comes the message type as a single byte
      */
     const typeValue = buffer.readUInt8(offset++)
-    const type = typeValue === 0x01 ? CacheBusMessageType.Set : CacheBusMessageType.Delete
+    const type = this.numToBusMessageType(typeValue)
 
     /**
      * Finally, the keys

packages/bentocache/tests/bus/bus.spec.ts

@@ -269,6 +269,37 @@ test.group('Bus synchronization', () => {
   })
     .waitForDone()
     .disableTimeout()
+  
+  test('binary encoding/decoding using Clear should be fine', async ({ assert, cleanup }, done) => {
+    const bus1 = redisBusDriver({ connection: REDIS_CREDENTIALS })
+      .factory(null as any)
+      .setId('foo')
+
+    const bus2 = redisBusDriver({ connection: REDIS_CREDENTIALS })
+      .factory(null as any)
+      .setId('bar')
+
+    cleanup(async () => {
+      await bus1.disconnect()
+      await bus2.disconnect()
+    })
+
+    const data = {
+      keys: [],
+      type: CacheBusMessageType.Clear,
+    }
+
+    bus1.subscribe('foo', (message: any) => {
+      assert.deepInclude(message, data)
+      done()
+    })
+
+    await setTimeout(200)
+
+    await bus2.publish('foo', data)
+  })
+    .waitForDone()
+    .disableTimeout()
 
   test('works with utf8 characters', async ({ assert }, done) => {
     const bus1 = redisBusDriver({ connection: REDIS_CREDENTIALS })