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Airframe MessagePack-based codec
/*
* 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.codec
import wvlet.airframe.msgpack.spi.{Packer, Unpacker, ValueType}
import wvlet.airframe.surface.*
import wvlet.log.LogSupport
import wvlet.airframe.json.JSONParseException
import scala.util.{Failure, Success, Try}
trait PackAsMapSupport[A] { self: MessageCodec[A] =>
def packAsMap(p: Packer, v: A): Unit
}
/**
* A generic codec for parameter lists:
* - array form: [v1, v2, ...]
* - map form: {k1:v1, k2:v2, ..}
*
* @param name
* @param params
* @param paramCodec
* @param methodOwner
*/
class ParamListCodec(
name: String,
params: IndexedSeq[Parameter],
paramCodec: Seq[MessageCodec[_]],
methodOwner: Option[Any] = None
) extends MessageCodec[Seq[Any]]
with LogSupport {
private lazy val codecTable =
params
.zip(paramCodec)
.map { case (p, c) => CName.toCanonicalName(p.name) -> c }
.toMap[String, MessageCodec[_]]
override def pack(p: Packer, v: Seq[Any]): Unit = {
packAsArray(p, v)
}
def packAsArray(p: Packer, paramValueList: Seq[Any]): Unit = {
val numParams = params.length
// Use array format [p1, p2, ....]
p.packArrayHeader(numParams)
for ((paramValue, codec) <- paramValueList.zip(paramCodec)) {
if (paramValue == null) {
p.packNil
} else {
codec.asInstanceOf[MessageCodec[Any]].pack(p, paramValue)
}
}
}
def packAsMap(p: Packer, obj: Any): Unit = {
def hasValue(param: Parameter): Boolean = {
if (!param.surface.isOption) {
true
} else {
param.get(obj) match {
case None => false
case _ => true
}
}
}
// Count the number of non-None values
val numParams = params.count(hasValue)
// Use map format {k1:p1, k2:p2, ....}
p.packMapHeader(numParams)
for ((param, codec) <- params.zip(paramCodec)) {
// If the parameter value is None of Option type, we can suppress its key-value output.
if (hasValue(param)) {
val paramValue = param.get(obj)
p.packString(param.name)
codec.asInstanceOf[MessageCodec[Any]].pack(p, paramValue)
}
}
}
private def getParamDefaultValue(p: Parameter): Any = {
def returnZero: Any = {
if (p.isRequired) {
// If the parameter has @required annotation, we can't use the Zero value
throw new MessageCodecException(
MISSING_PARAMETER,
this,
s"Parameter ${name}.${p.name} is missing in the input"
)
} else {
Zero.zeroOf(p.surface)
}
}
p match {
case m: MethodParameter =>
methodOwner
.flatMap { owner =>
// If the method owner instance is provided, we can resolve method arg default values
m.getMethodArgDefaultValue(owner)
}
.orElse(p.getDefaultValue)
.getOrElse(returnZero)
case other =>
p.getDefaultValue.getOrElse(returnZero)
}
}
override def unpack(u: Unpacker, v: MessageContext): Unit = {
val numParams = params.length
u.getNextFormat.getValueType match {
case ValueType.ARRAY =>
val numElems = u.unpackArrayHeader
var index = 0
val b = Seq.newBuilder[Any]
while (index < numElems && index < numParams) {
val p = params(index)
paramCodec(index).unpack(u, v)
val arg = if (v.isNull) {
trace(v.getError)
getParamDefaultValue(p)
} else {
v.getLastValue
}
b += arg
index += 1
}
// Populate args with the default or zero value
while (index < numParams) {
val p = params(index)
val v = getParamDefaultValue(p)
b += v
index += 1
}
// Ignore additional args
while (index < numElems) {
u.skipValue
index += 1
}
v.setObject(b.result())
case ValueType.MAP =>
val m = Map.newBuilder[String, Any]
// { key:value, ...} -> record
val mapSize = u.unpackMapHeader
for (i <- 0 until mapSize) {
// Read key
val keyValue = u.unpackValue
val keyString = keyValue.toString
// Use CName for parameter names
val cKey = CName.toCanonicalName(keyString)
// Read value
codecTable.get(cKey) match {
case Some(codec) =>
codec.unpack(u, v)
if (!v.isNull) {
m += (cKey -> v.getLastValue)
}
case None =>
// unknown parameter
u.skipValue
}
}
val map = m.result()
val args = for (i <- 0 until numParams) yield {
val p = params(i)
val paramName = CName.toCanonicalName(p.name)
map
.get(paramName)
.getOrElse(getParamDefaultValue(p))
}
trace(s"map:${map.mkString(",")}, args:${args.mkString(", ")}")
v.setObject(args)
case ValueType.STRING =>
// Assume it's a JSON input
val json = u.unpackString
try {
val msgpack = JSONCodec.toMsgPack(json)
this.unpackMsgPack(msgpack).map { x => v.setObject(x) }
} catch {
case e: JSONParseException =>
v.setError(e)
}
case other =>
u.skipValue
v.setIncompatibleFormatException(this, s"Expected ARRAY or MAP type input for ${name}")
}
}
}
sealed trait ObjectCodecBase {
def paramCodec: Seq[MessageCodec[_]]
}
/**
*/
case class ObjectCodec[A](surface: Surface, paramCodec: Seq[MessageCodec[_]])
extends MessageCodec[A]
with ObjectCodecBase
with PackAsMapSupport[A]
with LogSupport {
private val paramListCodec = new ParamListCodec(surface.name, surface.params.toIndexedSeq, paramCodec)
override def pack(p: Packer, v: A): Unit = {
val paramValues = surface.params.map(p => p.get(v))
paramListCodec.packAsArray(p, paramValues)
}
def packAsMap(p: Packer, v: A): Unit = {
paramListCodec.packAsMap(p, v)
}
override def unpack(u: Unpacker, v: MessageContext): Unit = {
paramListCodec.unpack(u, v)
if (!v.isNull) {
val args = v.getLastValue.asInstanceOf[Seq[Any]]
surface.objectFactory match {
case Some(c) =>
Try(c.newInstance(args)) match {
case Success(x) => v.setObject(x)
case Failure(e) => v.setError(e)
}
case None =>
warn(s"No factory is found for ${surface}")
v.setNull
}
}
}
}
/**
* ObjectCodec for generating map values. This is suited to JSON object generation
*
* @param surface
* @param paramCodec
* @tparam A
*/
case class ObjectMapCodec[A](surface: Surface, paramCodec: Seq[MessageCodec[_]])
extends MessageCodec[A]
with ObjectCodecBase
with PackAsMapSupport[A]
with LogSupport {
private val paramListCodec = new ParamListCodec(surface.name, surface.params.toIndexedSeq, paramCodec)
override def pack(p: Packer, v: A): Unit = {
paramListCodec.packAsMap(p, v)
}
override def packAsMap(p: Packer, v: A): Unit = pack(p, v)
override def unpack(u: Unpacker, v: MessageContext): Unit = {
paramListCodec.unpack(u, v)
if (!v.isNull) {
val args = v.getLastValue.asInstanceOf[Seq[Any]]
surface.objectFactory match {
case Some(c) =>
Try(c.newInstance(args)) match {
case Success(x) => v.setObject(x)
case Failure(e) => v.setError(e)
}
case None =>
warn(s"No factory is found for ${surface}")
v.setNull
}
}
}
}