wvlet.airframe.http.RPCEncoding.scala Maven / Gradle / Ivy

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REST and RPC Framework

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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package wvlet.airframe.http

import wvlet.airframe.codec.MessageCodec
import wvlet.airframe.codec.PrimitiveCodec.ValueCodec
import wvlet.airframe.msgpack.spi.Value

import java.nio.charset.StandardCharsets

/**
  */
sealed trait RPCEncoding {
  def applicationType: String
  def encodeWithCodec[A](v: A, codec: MessageCodec[A]): Array[Byte]
  def unpackValue(bytes: Array[Byte]): Value
}

object RPCEncoding {
  // Note on why we use appliaction/msgpack https://github.com/msgpack/msgpack/issues/194
  val ApplicationMsgPack = "application/msgpack"
  val ApplicationJson    = "application/json"

  case object MsgPack extends RPCEncoding {
    override def applicationType: String = ApplicationMsgPack
    override def encodeWithCodec[A](v: A, codec: MessageCodec[A]): Array[Byte] = {
      codec.toMsgPack(v)
    }
    override def unpackValue(bytes: Array[Byte]): Value = {
      ValueCodec.unpack(bytes)
    }
  }

  case object JSON extends RPCEncoding {
    override def applicationType: String = ApplicationJson
    override def encodeWithCodec[A](v: A, codec: MessageCodec[A]): Array[Byte] = {
      codec.toJson(v).getBytes(StandardCharsets.UTF_8)
    }
    override def unpackValue(bytes: Array[Byte]): Value = {
      ValueCodec.fromJson(new String(bytes, StandardCharsets.UTF_8))
    }
  }

  private[http] def isJsonObjectMessage(bytes: Array[Byte]): Boolean = {
    bytes.length >= 2 && bytes.head == '{' && bytes.last == '}'
  }
}