Submitting multipart/form-data in ScalaWS - scala

Question

I'm trying to create a post with 2 parts: the first part is a json text and the second, is the binary audio content.
The code to send the post is actually:
val ref = UUID.randomUUID()
val requestJobData = s"""
{
"reference": "$ref",
"operating_mode": "accurate",
"callback_url": "http://localhost:8100/",
"model": { "name": "por-bra" },
"channels": {
"firstChannelLabel": {
"result_format": "transcript",
"format":"audio/x-wav",
"num_speakers":2,
}
}
}
"""
val jsonPart = DataPart("json", requestJobData)
val filePart = FilePart("firstChannelLabel", "audio(1).wav", Some("audio/x-wav"), FileIO.fromPath(Paths.get("C:\\Input\\_pending\\audio(1).wav")))
val body = Source(filePart :: jsonPart :: List())
val response =
client.url(s"$baseUrl")
.post(body)
.map {response => response.body[String]}
When I try this code I get these errors:
Error:(73, 14) Cannot find an instance of akka.stream.scaladsl.Source[Product with Serializable with play.api.mvc.MultipartFormData.Part[akka.stream.scaladsl.Source[akka.util.ByteString,scala.concurrent.Future[akka.stream.IOResult]]],akka.NotUsed] to WSBody. Define a BodyWritable[akka.stream.scaladsl.Source[Product with Serializable with play.api.mvc.MultipartFormData.Part[akka.stream.scaladsl.Source[akka.util.ByteString,scala.concurrent.Future[akka.stream.IOResult]]],akka.NotUsed]] or extend play.api.libs.ws.ahc.DefaultBodyWritables
.post(body)
Error:(73, 14) not enough arguments for method post: (implicit evidence$3: play.api.libs.ws.BodyWritable[akka.stream.scaladsl.Source[Product with Serializable with play.api.mvc.MultipartFormData.Part[akka.stream.scaladsl.Source[akka.util.ByteString,scala.concurrent.Future[akka.stream.IOResult]]],akka.NotUsed]])scala.concurrent.Future[play.api.libs.ws.StandaloneWSRequest#Response].
Unspecified value parameter evidence$3.
.post(body)
My dependencies are:
scalaVersion := "2.12.1"
libraryDependencies += "org.scalatestplus.play" %% "scalatestplus-play" % "3.1.0" % Test
libraryDependencies += ws
libraryDependencies += guice
libraryDependencies += "com.typesafe" % "config" % "1.3.1"
libraryDependencies ++= Seq(
"com.typesafe.akka" %% "akka-actor" % "2.5.3",
"com.typesafe.akka" %% "akka-testkit" % "2.5.3" % Test
)
libraryDependencies += "com.typesafe.play" %% "play-ahc-ws-standalone" % "1.0.0"
libraryDependencies += "com.typesafe.play" %% "play-ws-standalone-json" % "1.0.0"
libraryDependencies ++= Seq(
"com.github.pureconfig" %% "pureconfig" % "0.7.2"
)
Can anyone help with this? Thanks in advance!

Answer 1

As I needed to accomplish this task faster, for this specific part I had to switch to another library called apache.http (http://hc.apache.org/httpcomponents-client-ga/)
These are my current settings:
build.sbt
libraryDependencies ++= Seq(
"org.apache.httpcomponents" % "httpclient" % "4.3.1",
"org.apache.httpcomponents" % "httpmime" % "4.3.1"
)
Complete POST example:
import org.apache.http.client.methods.{HttpGet, HttpPost}
import org.apache.http.entity.ContentType
import org.apache.http.entity.mime.MultipartEntityBuilder
import org.apache.http.impl.client.HttpClients
import org.apache.http.util.EntityUtils
val ref = UUID.randomUUID()
val requestJobData =
s"""
{
"reference": "$ref",
"operating_mode": "accurate",
"model": { "name": "por-bra" },
"channels": {
"firstChannelLabel": {
"result_format": "lattice",
"format":"audio/x-wav",
"num_speakers":2
}
}
}
"""
val entity = MultipartEntityBuilder.create()
entity.addTextBody("json", requestJobData, ContentType.APPLICATION_JSON)
val path = Paths.get(audioPath)
val fileName = path.getFileName().toString()
val fileStream = new FileInputStream(audioPath)
entity.addBinaryBody("firstChannelLabel", fileStream, ContentType.create("audio/x-wav"), fileName)
val client = HttpClients.createDefault()
try {
val post = new HttpPost(baseUrl)
post.setEntity(entity.build())
val response = client.execute(post)
}
catch {
case e: Throwable =>
log.error("erro ao agendar job: " + e.toString())
}
finally {
client.close()
}
It's really working. I omitted some parts of the code regarding communication with actors and other logging, but I hope this helps anyone.