Type conversion like Redis rust

[ymwjbxxq]

Hello,

If I use Redis this is the syntax:

let value: Option<String> = cache_client.get(&key).await.ok();
if let Some(value) = value {
   let item = serde_json::from_str::<Item>(&value).unwrap();
   items.lock().unwrap().push(item);
} else {
  warning!("MISSING CACHE KEY: {}", key);
}

Using Momento:

let get_response = cache_client
   .get("cache_name", key)
   .await
   .map_err(|e| error!("ERROR - Momento - get_object {:?}", e))
   .ok();

if let Some(get_response) = get_response {
   let value: Option<String> = match get_response {
      Get::Hit { value } => value.try_into().ok(),
      Get::Miss => None,
   };

   if let Some(value) = value {
      let item = serde_json::from_str::<MyItem>(&value)?;
      items.push(item);
   } else {
      warning!("MISSING CACHE KEY: {}", key);
   }
} else {
   error!("MOMENTO get is null: {}", key);
}

Is there a way to convert types quickly? https://docs.rs/redis/latest/redis/#type-conversions

Thank you so much for your help.

[kvcache]

Hi @ymwjbxxq, thanks for this issue. We don’t have a way right now to do the succinct type conversion. I agree with you that it would be a better experience.

By the way, I think you can get rid of your intermediate String in the redis path by implementing https://docs.rs/redis/latest/redis/trait.FromRedisValue.html for Item which will let you directly receive Option

[kvcache]

@cprice404 we should think about whether we would be best served by integrating with serde or using a separate trait (like the redis crate) or both.