PLT-5308 Caching layer part 2 (#6973)

* Adding Reaction store cache layer example

* Implementing reaction store in new caching system.

* Redis for reaction store

* Adding redis library

* Adding invalidation for DeleteAllWithEmojiName and other minor enhancements

vendor/github.com/go-redis/redis/command_test.go

@@ -0,0 +1,60 @@
+package redis_test
+
+import (
+	"github.com/go-redis/redis"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Cmd", func() {
+	var client *redis.Client
+
+	BeforeEach(func() {
+		client = redis.NewClient(redisOptions())
+		Expect(client.FlushDB().Err()).NotTo(HaveOccurred())
+	})
+
+	AfterEach(func() {
+		Expect(client.Close()).NotTo(HaveOccurred())
+	})
+
+	It("implements Stringer", func() {
+		set := client.Set("foo", "bar", 0)
+		Expect(set.String()).To(Equal("set foo bar: OK"))
+
+		get := client.Get("foo")
+		Expect(get.String()).To(Equal("get foo: bar"))
+	})
+
+	It("has val/err", func() {
+		set := client.Set("key", "hello", 0)
+		Expect(set.Err()).NotTo(HaveOccurred())
+		Expect(set.Val()).To(Equal("OK"))
+
+		get := client.Get("key")
+		Expect(get.Err()).NotTo(HaveOccurred())
+		Expect(get.Val()).To(Equal("hello"))
+
+		Expect(set.Err()).NotTo(HaveOccurred())
+		Expect(set.Val()).To(Equal("OK"))
+	})
+
+	It("has helpers", func() {
+		set := client.Set("key", "10", 0)
+		Expect(set.Err()).NotTo(HaveOccurred())
+
+		n, err := client.Get("key").Int64()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(n).To(Equal(int64(10)))
+
+		un, err := client.Get("key").Uint64()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(un).To(Equal(uint64(10)))
+
+		f, err := client.Get("key").Float64()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(f).To(Equal(float64(10)))
+	})
+
+})