JarCastingakka-http-scalapb
akka-http protobuf and json marshalling/unmarshalling for ScalaPB messages
Versions
| Version | Release date | Akka Http version | ScalaPB version | Scala versions |
|---|---|---|---|---|
0.2.3 |
2020-09-18 | 10.2.0 |
0.10.8 (0.10.1 json4s) |
2.13.3, 2.12.12 |
0.2.2 |
2020-05-10 | 10.1.11 |
0.10.3 (0.10.1 json4s) |
2.13.2, 2.12.11 |
0.2.1 |
2019-07-13 | 10.1.8 |
0.9.0 (0.9.2 json4s) |
2.13.0, 2.12.8, 2.11.12 |
0.2.0 |
2019-06-22 | 10.1.8 |
0.9.0 (0.9.2 json4s) |
2.13.0, 2.12.8, 2.11.12 |
0.1.0 |
2019-01-27 | 10.1.7 |
0.8.4 (0.7.2 json4s) |
2.12.8, 2.11.12 |
The complete list can be found in the CHANGELOG file.
Getting akka-http-scalapb
Libraries are published to Maven Central. Add to your build.sbt:
libraryDependencies += "fr.davit" %% "akka-http-scalapb" % <version> // binary & json support
Quick start
For the examples, we are using the following proto domain model
message Item {
string name = 1;
int64 id = 2;
}
message Order {
reapeated Item items = 1;
}
The implicit marshallers and unmarshallers for your generated proto classes are defined in ScalaPBSupport. You simply need to have them in scope.
import akka.http.scaladsl.server.Directives._
import fr.davit.akka.http.scaladsl.marshallers.scalapb.ScalaPBSupport._
object MyProtoService {
val route =
get {
pathSingleSlash {
complete(Item("thing", 42))
}
} ~ post {
entity(as[Order]) { order =>
val itemsCount = order.items.size
val itemNames = order.items.map(_.name).mkString(", ")
complete(s"Ordered $itemsCount items: $itemNames")
}
}
}
Marshalling/Unmarshalling of the generated classes depends on the Accept/Content-Type header sent by the client:
Content-Type: application/json: jsonContent-Type: application/x-protobuf: binaryContent-Type: application/x-protobuffer: binaryContent-Type: application/protobuf: binaryContent-Type: application/vnd.google.protobuf: binary
No Accept header or matching several (eg Accept: application/*) will take the 1st matching type from the above list.
Json only
If you are using scalaPB for json (un)marshalling only, you can use ScalaPBJsonSupport from the sub module
libraryDependencies += "fr.davit" %% "akka-http-scalapb-json4s" % <version> // json support only
Binary only
If you are using scalaPB for binary (un)marshalling only, you can use ScalaPBBinarySupport form the sub module
libraryDependencies += "fr.davit" %% "akka-http-scalapb-binary" % <version> // binary support only
Limitation
Only json (un)marshallers are able to support collections of proto messages as root object.
Entity streaming (http chunked transfer) is at the moment not supported by the library.