Add Redis Serialization Protocol support (#290)

* Bring in the files

* Add request-response pair matcher for Redis

* Implement the `Represent` method

* Update `representGeneric` method signature

* Don't export `IntToByteArr`

* Remove unused `newRedisInputStream` method

* Return the errors as string

* Adapt to the latest change in the `develop`

tap/extensions/redis/helpers.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"encoding/json"
+
+	"github.com/up9inc/mizu/tap/api"
+)
+
+type RedisPayload struct {
+	Data interface{}
+}
+
+type RedisPayloader interface {
+	MarshalJSON() ([]byte, error)
+}
+
+func (h RedisPayload) MarshalJSON() ([]byte, error) {
+	return json.Marshal(h.Data)
+}
+
+type RedisWrapper struct {
+	Method  string      `json:"method"`
+	Url     string      `json:"url"`
+	Details interface{} `json:"details"`
+}
+
+func representGeneric(generic map[string]string) (representation []interface{}) {
+	details, _ := json.Marshal([]map[string]string{
+		{
+			"name":  "Type",
+			"value": generic["type"],
+		},
+		{
+			"name":  "Command",
+			"value": generic["command"],
+		},
+		{
+			"name":  "Key",
+			"value": generic["key"],
+		},
+		{
+			"name":  "Value",
+			"value": generic["value"],
+		},
+		{
+			"name":  "Keyword",
+			"value": generic["keyword"],
+		},
+	})
+	representation = append(representation, map[string]string{
+		"type":  api.TABLE,
+		"title": "Details",
+		"data":  string(details),
+	})
+
+	return
+}