Golang - Ristretto Cache returning base 64 - json

Question

I am encountering a problem while using ristretto cache. Indeed, i have a little api that should return me a value stored in my ristretto cache as json.
The problem is that when i call my function, the return is the json encoded in base64 and i just can't find the way to decode it.
Here is the code i have:
Part 1: the code for initializing my ristretto cache:
func InitCache() {
var err error
ristrettoCache, err = ristretto.NewCache(&ristretto.Config{
NumCounters: 3000,
MaxCost: 1e6,
BufferItems: 64,
})
if err != nil {
panic(err)
}
}
Part 2: Putting my values in cache:
for _, t := range listTokensFromDB {
b, err := json.Marshal(t)
if err != nil {
fmt.Println(err)
}
ristrettoCache.Set(t.Symbol, b, 1)
}
Part 3: getting the value from cache
func getTokenInfo(w http.ResponseWriter, r *http.Request){
vars := mux.Vars(r)
key := vars["chain"]+vars["symbol"]
value, found := ristrettoCache.Get(key)
if !found {
return
}
json.NewEncoder(w).Encode(value)
}
The result i have when i make a call to my api is:
"eyJTeW1ib2wiOiJic2NDUllQVE8iLCJBZGRyIjoiMHgyQmNBMUFlM0U1MjQ0NzMyM0IzRWE0NzA4QTNkMTg1ODRDYWY4NWE3IiwiTHBzIjpbeyJTeW1ib2xUb2tlbiI6IkZFRyIsIlRva2VuQWRkciI6IjB4YWNGQzk1NTg1RDgwQWI2MmY2N0ExNEM1NjZDMWI3YTQ5RmU5MTE2NyIsIkxwQWRkciI6IjB4NDU5ZTJlMjQ4NGNlMDU2MWRmNTJiYzFlNjkxMzkyNDA2M2JhZDM5MCJ9LHsiU3ltYm9sVG9rZW4iOiJmQk5CIiwiVG9rZW5BZGRyIjoiMHg4N2IxQWNjRTZhMTk1OEU1MjIyMzNBNzM3MzEzQzA4NjU1MWE1Yzc2IiwiTHBBZGRyIjoiMHg3OGM2NzkzZGMxMDY1OWZlN2U0YWJhMTQwMmI5M2Y2ODljOGY0YzI3In1dfQ=="
But i want the base64 decoded version...
If I change the value b to be string when i insert it in cache like so:
for _, t := range listTokensFromDB {
b, err := json.Marshal(t)
if err != nil {
fmt.Println(err)
}
ristrettoCache.Set(t.Symbol, string(b), 1)
}
When i get the response, i get the stringified json like this:
"{"Symbol":"bscCRYPTO","Addr":"0x2BcA1Ae3E52447323B..."
And i can't find a way to get out of this string :/
Anyone would know how i could get the real json please?
Thank you in advance and i wish u a good day!

Answer 1

From my comments, I meant, in this line, value is most likely of type []byte (or []uint8 - which is the same thing)
value, found := ristrettoCache.Get(key)
JSON encoding a []byte will implicitly base64 the output - since JSON is text-based.
json.NewEncoder(w).Encode(value) // <- value is of type []byte
Inspecting the base64 you posted (https://play.golang.org/p/NAVS4qRfDM2) the underlying binary-bytes are already encoded in JSON - so no extra json.Encode is needed.
Just output the raw-bytes in your handler - and set the content-type to application/json:
func getTokenInfo(w http.ResponseWriter, r *http.Request){
vars := mux.Vars(r)
key := vars["chain"]+vars["symbol"]
value, found := ristrettoCache.Get(key)
if !found {
return
}
// json.NewEncoder(w).Encode(value) // not this
w.Header().Set("Content-Type", "application/json")
if bs, ok := value.([]byte); ok {
_, err := w.Write(bs) //raw bytes (already encoded in JSON)
// check 'err'
} else {
// error unexpected type behind interface{}
}
}