### Redis Client Cache Tracking Example

Source: https://github.com/smallnest/resp3/blob/master/README.md

Demonstrates how to use the resp3 library to implement client-side caching with Redis 6.0's tracking feature. It shows connecting to Redis, enabling tracking, sending commands, and handling pushed invalidation messages.

```Go
package main

import (
	"net"
	"strconv"
	"testing"
	"time"
	"github.com/smallnest/resp3"
)

func TestReader_IT_Tracking(t *testing.T) {
	conn, err := net.DialTimeout("tcp", "127.0.0.1:6379", 5*time.Second)
	if err != nil {
		t.Logf("can't found one of redis 6.0 server")
		return
	}
	defer conn.Close()

	w := resp.NewWriter(conn)
	r := resp.NewReader(conn)

	w.WriteCommand("HELLO", "3")
	helloResp, _, err := r.ReadValue()
	if err != nil {
		t.Fatalf("failed to send a HELLO 3")
	}
	if helloResp.KV.Size() == 0 {
		t.Fatalf("expect some info but got %+v", helloResp)
	}
	t// t.Logf("hello response: %c, %v", helloResp.Type, helloResp.SmartResult())

	w.WriteCommand("CLIENT", "TRACKING", "on")
	resp, _, err := r.ReadValue()
	if err != nil {
		t.Fatalf("failed to TRACKING: %v", err)
	}
	// t.Logf("TRACKING result: %c, %+v", resp.Type, resp.SmartResult())

	w.WriteCommand("GET", "a")
	resp, _, err = r.ReadValue()
	if err != nil {
		t.Fatalf("failed to GET: %v", err)
	}
	// t.Logf("GET result: %c, %+v", resp.Type, resp.SmartResult())

	go func() {
		conn, err := net.DialTimeout("tcp", "127.0.0.1:9999", 5*time.Second)
		if err != nil {
			t.Logf("can't found one of redis 6.0 server")
			return
		}
		defer conn.Close()
		w := resp.NewWriter(conn)
		r := resp.NewReader(conn)

		for i := 0; i < 10; i++ {
			//PUBLISH
			w.WriteCommand("set", "a", strconv.Itoa(i))
			resp, _, err = r.ReadValue()
			if err != nil {
				t.Fatalf("failed to set: %v", err)
			}
			// t.Logf("set result: %c, %+v", resp.Type, resp.SmartResult())
			time.Sleep(200 * time.Millisecond)
		}

	}()

	for i := 0; i < 10; i++ {
		resp, _, err = r.ReadValue()
		if err != nil {
			t.Fatalf("failed to receive a message: %v", err)
		}
		if resp.Type == resp.TypePush && len(resp.Elems) >= 2 && resp.Elems[0].SmartResult().(string) == "invalidate" {
			// t.Logf("received TRACKING result: %c, %+v", resp.Type, resp.SmartResult())

			// refresh cache "a"
			w.WriteCommand("GET", "a")
			resp, _, err = r.ReadValue()
		}
	}
}

```

--------------------------------

### RESP3 Data Types Overview

Source: https://github.com/smallnest/resp3/blob/master/README.md

Lists and describes the various data types supported by the RESP3 protocol, including those inherited from RESP2 and new types introduced in RESP3. This provides a conceptual understanding of the protocol's structure.

```APIDOC
RESP3 Data Types:

Types equivalent to RESP version 2:
- Array: An ordered collection of N other types.
- Blob string: Binary safe strings.
- Simple string: A space efficient non binary safe string.
- Simple error: A space efficient non binary safe error code and message.
- Number: An integer in the signed 64 bit range.

Types introduced by RESP3:
- Null: A single null value replacing RESP v2 null values.
- Double: A floating point number.
- Boolean: True or false.
- Blob error: Binary safe error code and message.
- Verbatim string: A binary safe string intended for human display without escaping.
- Map: An ordered collection of key-value pairs, where keys and values can be any RESP3 type.
- Set: An unordered collection of N other types.
- Attribute: Similar to Map, but clients should ignore the attribute type and return it as additional information.
- Push: Out-of-band data, formatted like an Array. The first element indicates the push type, potentially triggering a callback.
- Hello: Similar to Map, sent upon connection establishment to provide server information (name, version, etc.).
- Big number: A large number not representable by the standard Number type.
```

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