evalBulk() return types and parsing fail

[salokanto]

This is related to #128 and #129. Using "net.debasishg" %% "redisclient" % "3.4".

Case 1: trying explicitly to specify return type. val result = redisPool.withClient(_.evalBulk[Int]("return 1", List.empty, List.empty)) Does not compile:

RedisTest.scala:48: could not find implicit value for parameter parse: com.redis.serialization.Parse[Int]

Case 2: Not specifying the return type: val result = redisPool.withClient(_.evalBulk("return 1", List.empty, List.empty)) Compiles, but crashes at run time:

java.lang.Exception: Protocol error: Got (:,[B@7eab8553) as initial reply byte
	at com.redis.Reply$$anonfun$8.applyOrElse(RedisProtocol.scala:121)
	at com.redis.Reply$$anonfun$8.applyOrElse(RedisProtocol.scala:119)
	at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36)
	at com.redis.Reply$$anonfun$4.applyOrElse(RedisProtocol.scala:78)
	at com.redis.Reply$$anonfun$4.applyOrElse(RedisProtocol.scala:78)
	at scala.PartialFunction$OrElse.apply(PartialFunction.scala:167)
	at com.redis.Reply$class.receive(RedisProtocol.scala:140)
	at com.redis.RedisClient.receive(RedisClient.scala:95)
	at com.redis.R$class.asBulk(RedisProtocol.scala:243)
	at com.redis.RedisClient.asBulk(RedisClient.scala:95)
	at com.redis.EvalOperations$$anonfun$evalBulk$1.apply(EvalOperations.scala:13)
	at com.redis.EvalOperations$$anonfun$evalBulk$1.apply(EvalOperations.scala:13)
	at com.redis.Redis$class.send(RedisClient.scala:22)
	at com.redis.RedisClient.send(RedisClient.scala:95)
	at com.redis.EvalOperations$class.evalBulk(EvalOperations.scala:13)
	at com.redis.RedisClient.evalBulk(RedisClient.scala:95)
	at test.RedisTest$$anonfun$1.apply(RedisTest.scala:48)

IntelliJ indicates that the type of result in this case is Option[String]. That would be fine, I can convert it to an Int, but clearly Redis is not returning a String.

(Oh yes, I can use Lua tostring() on the return value, but that feels relatively stupid.)

[masonkirchner]

@salokanto Did you ever find a fix to this?

[salokanto]

@masonkirchner Nope. I'm using send("EVAL", ...) instead of evalBulk now, and parsing the results with asList, asInt, and others from the "aptly" named com.redis.R trait.

[mbuccini]

A bit hacky, but this will also solve the issue:

implicit val parse = Parse[Int](new String(_, "UTF-8").toInt)
redis.evalSHA[Int](params, ... )

or simply import the implicits if you don't want to copy/paste them

import Parse.Implicits._
redis.evalSHA[Int](params, ... )