How to connect to Mongo DB in Docker from Scala Play Framework? - mongodb

Question

I have a Mongo DB Docker container running on 192.168.0.229. From another computer, I can access it via:
> mongo "mongodb://192.168.0.229:27017/test"
But when I add that configuration string (host="192.168.0.229") to my Play Framework app, I get a timeout error:
[debug] application - Login Form Success: UserData(larry#gmail.com,testPW)
[error] p.a.h.DefaultHttpErrorHandler -
! #7m7kggikl - Internal server error, for (POST) [/] ->
play.api.http.HttpErrorHandlerExceptions$$anon$1: Execution exception[[TimeoutException: Future timed out after [30 seconds]]]
In the past, the connection was successful with host="localhost" and even an Atlas cluster (host="mycluster.gepld.mongodb.net") for the hostname, so there were no problems connecting previously with the same code. For some reason, Play Framework does not want to connect to this endpoint!
Could it be because the hostname is an IP address? Or, maybe Play/ Akka is doing something under the covers to stop the connection (or something to make Mongo/Docker refuse to accept it?)?
I'm using this driver:
"org.mongodb.scala" %% "mongo-scala-driver" % "4.4.0"
Perhaps I should switch to the Reactive Scala Driver? Any help would be appreciated.
Clarifications:
The Mongo DB Docker container is running on a linux machine on my local network. This container is reachable from within my local network at 192.168.0.229. The goal is to set my Play Framework app configuration to point to the DB at this address, so that as long as the Docker container is running, I can develop from any computer on my local network. Currently, I am able to access the container through the mongo shell on any computer:
> mongo "mongodb://192.168.0.229:27017/test"
I have a Play Framework app with the following in the Application.conf:
datastore {
# Dev
host: "192.168.0.229"
port: 27017
dbname: "test"
user: ""
password: ""
}
This data is used in a connection helper file called DataStore.scala:
package model.db.mongo
import org.mongodb.scala._
import utils.config.AppConfiguration
trait DataStore extends AppConfiguration {
lazy val dbHost = config.getString("datastore.host")
lazy val dbPort = config.getInt("datastore.port")
lazy val dbUser = getConfigString("datastore.user", "")
lazy val dbName = getConfigString("datastore.dbname", "")
lazy val dbPasswd = getConfigString("datastore.password", "")
//MongoDB Atlas Method (Localhost if DB User is empty)
val uri: String = s"mongodb+srv://$dbUser:$dbPasswd#$dbHost/$dbName?retryWrites=true&w=majority"
//val uri: String = "mongodb+svr://192.168.0.229:27017/?compressors=disabled&gssapiServiceName=mongodb"
System.setProperty("org.mongodb.async.type", "netty")
val mongoClient: MongoClient = if (getConfigString("datastore.user", "").isEmpty()) MongoClient() else MongoClient(uri)
print(mongoClient.toString)
print(mongoClient.listDatabaseNames())
val database: MongoDatabase = mongoClient.getDatabase(dbName)
def close = mongoClient.close() //Do this when logging out
}
When you start the app, you open localhost:9000 which is simply a login form. When you fill out the data that corresponds with the data in the users collection, the Play app times out:
[error] p.a.h.DefaultHttpErrorHandler -
! #7m884abc4 - Internal server error, for (POST) [/] ->
play.api.http.HttpErrorHandlerExceptions$$anon$1: Execution exception[[TimeoutException: Future timed out after [30 seconds]]]
at play.api.http.HttpErrorHandlerExceptions$.$anonfun$convertToPlayException$2(HttpErrorHandler.scala:381)
at scala.Option.map(Option.scala:242)
at play.api.http.HttpErrorHandlerExceptions$.convertToPlayException(HttpErrorHandler.scala:380)
at play.api.http.HttpErrorHandlerExceptions$.throwableToUsefulException(HttpErrorHandler.scala:373)
at play.api.http.DefaultHttpErrorHandler.onServerError(HttpErrorHandler.scala:264)
at play.core.server.AkkaHttpServer$$anonfun$2.applyOrElse(AkkaHttpServer.scala:430)
at play.core.server.AkkaHttpServer$$anonfun$2.applyOrElse(AkkaHttpServer.scala:422)
at scala.concurrent.impl.Promise$Transformation.run(Promise.scala:454)
at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:63)
at akka.dispatch.BatchingExecutor$BlockableBatch.$anonfun$run$1(BatchingExecutor.scala:100)
Caused by: java.util.concurrent.TimeoutException: Future timed out after [30 seconds]
at scala.concurrent.impl.Promise$DefaultPromise.tryAwait0(Promise.scala:212)
at scala.concurrent.impl.Promise$DefaultPromise.result(Promise.scala:225)
at scala.concurrent.Await$.$anonfun$result$1(package.scala:201)
at akka.dispatch.MonitorableThreadFactory$AkkaForkJoinWorkerThread$$anon$3.block(ThreadPoolBuilder.scala:174)
at java.base/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3118)
at akka.dispatch.MonitorableThreadFactory$AkkaForkJoinWorkerThread.blockOn(ThreadPoolBuilder.scala:172)
at akka.dispatch.BatchingExecutor$BlockableBatch.blockOn(BatchingExecutor.scala:116)
at scala.concurrent.Await$.result(package.scala:124)
at model.db.mongo.DataHelpers$ImplicitObservable.headResult(DataHelpers.scala:27)
at model.db.mongo.DataHelpers$ImplicitObservable.headResult$(DataHelpers.scala:27)
The call to the Users collection is defined in UserAccounts.scala:
case class UserAccount(_id: String, fullname: String, username: String, password: String)
object UserAccount extends DataStore {
val logger: Logger = Logger("database")
//Required for using Case Classes
val codecRegistry = fromRegistries(fromProviders(classOf[UserAccount]), DEFAULT_CODEC_REGISTRY)
//Using Case Class to get a collection
val coll: MongoCollection[UserAccount] = database.withCodecRegistry(codecRegistry).getCollection("users")
//Using Document to get a collection
val listings: MongoCollection[Document] = database.getCollection("users")
def isValidLogin(username: String, password: String): Boolean = {
findUser(username) match {
case Some(u: UserAccount) => if(password.equals(u.password)) { true } else {false }
case None => false
}
}

Answer 1

Just an FYI if anyone runs into this problem. I had a bad line in my DataStore.scala file:
val mongoClient: MongoClient = if (getConfigString("datastore.user", "").isEmpty()) MongoClient() else MongoClient(uri)
Since I was trying to connect without a username (there's no auth on my test db), the above line was saying, "If there's no username, you must be trying to connect to the default MongoClient() location, which is localhost". My mistake.
I simply changed the above line to this:
val mongoClient: MongoClient = MongoClient(uri)