restapi（4）

restapi（4）"/>

restapi（4）

   完成了一套标准的rest风格数据库CRUD操作httpserver后发现有许多不足。主要是为了追求“通用”两个字，想把所有服务接口做的更“范generic”些，结果反而限制了目标数据库的特点，最终产生了一套功能弱小的玩具。比如说吧：标准rest风格getbyId需要所有的数据表都具备id这个字段，有点傻。然后get返回的结果集又没有什么灵活的控制方法如返回数量、字段、排序等。特别对MongoDB这样的在查询操作方面接近关系式数据库的分布式数据库：上篇提到过，它的query能力强大，条件组合灵活，如果不能在网络服务api中体现出来就太可惜了。所以，这篇博文会讨论一套专门针对MongoDB的rest-server。我想达到的目的是：后台数据库是MongoDB，通过httpserver提供对MongoDB的CRUD操作，客户端通过http调用CRUD服务。后台开发对每一个数据库表单使用统一的标准增添一套新的CRUD服务。希望如此能够提高开发效率，减少代码出错机会。

MongoDB是一种文件类型数据库，数据格式更加多样化。在这次示范里希望能把MongoDB有特点的数据类型以及它们的处理方法都介绍了，包括：日期类型，二进制类型blob（图片）等。顺便提一下：普通大型文本文件也可以用二进制blob方式存入MongoDB，因为文件在http传输过程中必须以byte方式进行，所以后台httpserver接收的文件格式是一串byte，不用任何格式转换就可以直接存入MongoDB blob字段。客户端从后台下载时就需要把bytes转换成UTF8字符就可以恢复文件内容了。

首先，我们先从Model开始，在scala里用case class来表示。Model是MongoDB Document的对应。在scala编程里我们是用case class 当作Document来操作的。我们设计的Model都会继承一个ModelBase trait：

trait ModelBase[E] {def to: E
}case class Person(userid: String = "",name: String = "",age: Option[Int] = None,dob: Option[MGODate] = None,   //生日address: Option[String] = None) extends ModelBase[Document] {import org.mongodb.scala.bson._override def to: Document = {var doc = Document("userid" -> this.userid,"name" -> this.name)if (this.age != None)doc = doc + ("age" -> this.age.get)if (this.dob != None)doc = doc + ("dob" -> this.dob.get)if (this.address != None)doc = doc + ("address" -> this.address.getOrElse(""))doc}}object Person {val fromDocument: Document => Person = doc => {val keyset = doc.keySetPerson(userid = doc.getString("userid"),name = doc.getString("name"),age = mgoGetIntOrNone(doc,"age").asInstanceOf[Option[Int]],dob =  {if (keyset.contains("dob"))Some(doc.getDate("dob"))else None },address =  mgoGetStringOrNone(doc,"address"))}}

在上面例子里Person对应MongoDB里一个Document。除了注意对应类型属性与表字段类型外，还提供了to,fromDecument两个转换函数。其中to函数是继承ModelBase的，代表所有MongoDB Model都必须具备to这个函数。这点很重要，因为在从json构建成Model时，如果属于ModelBase则肯定可以调用一个to函数：

 class MongoRoute[M <: ModelBase[Document]](val pathName: String)(repository: MongoRepo[M])(
...post {entity(as[String]) { json =>val extractedEntity: M = fromJson[M](json)val doc: Document = extractedEntity.toval futmsg = repository.insert(doc).value.value.runToFuture.map {eoc =>eoc match {case Right(oc) => oc match {case Some(c) => c.toString()case None => "insert may not complete!"}case Left(err) => err.getMessage}}

注意这个extractedEntity：我们现在还不能确定它的具体类型，是Person,Animal,Machine? 但我们确定它是M类型，而M<:ModalBase[Document]，所以M是MongoDB Model。可以调用extractedEntity.to获取一个Document。

仔细看，Person里并不包括blob类型字段。因为到现在我还没有想到办法在一个httprequest里把多个字段和图片一次性发出来，必须分两个request才能完成一个Document的上传。httpserver收到两个requests后还要进行requests的匹配对应管理，十分的复杂。所以含blob类型的Document只能把blob分拆到另一个Document里，然后用这个Document唯一一个id字段来链接：

  case class Photo (id: String,photo: Option[MGOBlob]) extends ModelBase[Document] {override def to: Document = {var doc = Document("id" -> this.id)if (photo != None)doc = doc + ("photo" -> this.photo)doc}}object Photo {def fromDocument: Document => Photo = doc => {val keyset = doc.keySetPhoto(id = doc.getString("id"),photo = mgoGetBlobOrNone(doc, "photo"))}}

从另一个角度来讲，把blob和正常字段分开来存储也有一定的优势，最多也就是需要两次query罢了。

第二部分是repository：数据库操作函数：

   class MongoRepo[R](db:String, coll: String, converter: Option[Document => R])(implicit client: MongoClient) {def getAll(next:Option[String],sort:Option[String],fields:Option[String],top:Option[Int]): DBOResult[Seq[R]] = {var res = Seq[ResultOptions]()next.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_FILTER,Some(Document(b)))}sort.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_SORT,Some(Document(b)))}fields.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_PROJECTION,Some(Document(b)))}top.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_LIMIT,None,b)}val ctxFind = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_QUERY).setCommand(Find(andThen = res))mgoQuery[Seq[R]](ctxFind,converter)}def query(filtr: Bson, next:Option[String],sort:Option[String],fields:Option[String],top:Option[Int]): DBOResult[Seq[R]] = {var res = Seq[ResultOptions]()next.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_FILTER,Some(Document(b)))}sort.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_SORT,Some(Document(b)))}fields.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_PROJECTION,Some(Document(b)))}top.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_LIMIT,None,b)}val ctxFind = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_QUERY).setCommand(Find(filter = Some(filtr),andThen = res))mgoQuery[Seq[R]](ctxFind,converter)}def getOneDocument(filtr: Bson): DBOResult[Document] = {val ctxFind = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_QUERY).setCommand(Find(filter = Some(filtr),firstOnly = true))mgoQuery[Document](ctxFind,converter)}def insert(doc: Document): DBOResult[Completed] = {val ctxInsert = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_UPDATE).setCommand(Insert(Seq(doc)))mgoUpdate[Completed](ctxInsert)}def delete(filter: Bson): DBOResult[DeleteResult] = {val ctxDelete = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_UPDATE).setCommand(Delete(filter))mgoUpdate[DeleteResult](ctxDelete)}def update(filter: Bson, update: Bson, many: Boolean): DBOResult[UpdateResult] = {val ctxUpdate = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_UPDATE).setCommand(Update(filter,update,None,!many))mgoUpdate[UpdateResult](ctxUpdate)}def replace(filter: Bson, row: Document): DBOResult[UpdateResult] = {val ctxUpdate = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_UPDATE).setCommand(Replace(filter,row))mgoUpdate[UpdateResult](ctxUpdate)}}

这部分上篇博文讨论过。最后是akka-http的核心部分：Route。MongoDB CRUD服务对外的api：

      (get & parameters('filter.?,'fields.?,'sort.?,'top.as[Int].?,'next.?)) {(filter,fields,sort,top,next) => {dbor = {filter match {case Some(fltr) => repository.query(Document(fltr),next,sort,fields,top)case None => repository.getAll(next,sort,fields,top)}}val futRows = dbor.value.value.runToFuture.map {eolr =>eolr match {case Right(olr) => olr match {case Some(lr) => lrcase None => Seq[M]()}case Left(_) => Seq[M]()}}complete(futureToJson(futRows))}} ~ post {entity(as[String]) { json =>val extractedEntity: M = fromJson[M](json)val doc: Document = extractedEntity.toval futmsg = repository.insert(doc).value.value.runToFuture.map {eoc =>eoc match {case Right(oc) => oc match {case Some(c) => c.toString()case None => "insert may not complete!"}case Left(err) => err.getMessage}}complete(futmsg)}} ~ (put & parameter('filter,'set.?, 'many.as[Boolean].?)) { (filter, set, many) =>val bson = Document(filter)if (set == None) {entity(as[String]) { json =>val extractedEntity: M = fromJson[M](json)val doc: Document = extractedEntity.toval futmsg = repository.replace(bson, doc).value.value.runToFuture.map {eoc =>eoc match {case Right(oc) => oc match {case Some(d) => s"${d.getMatchedCount} matched rows, ${d.getModifiedCount} rows updated."case None => "update may not complete!"}case Left(err) => err.getMessage}}complete(futureToJson(futmsg))}} else {set match {case Some(u) =>val ubson = Document(u)dbou = repository.update(bson, ubson, many.getOrElse(true))case None =>dbou = Left(new IllegalArgumentException("missing set statement for update!"))}val futmsg = dbou.value.value.runToFuture.map {eoc =>eoc match {case Right(oc) => oc match {case Some(d) => s"${d.getMatchedCount} matched rows, ${d.getModifiedCount} rows updated."case None => "update may not complete!"}case Left(err) => err.getMessage}}complete(futureToJson(futmsg))}} ~ (delete & parameters('filter, 'many.as[Boolean].?)) { (filter,many) =>val bson = Document(filter)val futmsg = repository.delete(bson).value.value.runToFuture.map {eoc =>eoc match {case Right(oc) => oc match {case Some(d) => s"${d.getDeletedCount} rows deleted."case None => "delete may not complete!"}case Left(err) => err.getMessage}}complete(futureToJson(futmsg))}}

与上篇最大的区别就是这次的Route支持MongoDB特性的query string，bson类型的参数。如：

http://192.168.0.189:50081/private/crud/person
http://192.168.0.189:50081/private/crud/person?filter={"userid":"c001"}
http://192.168.0.189:50081/private/crud/person?sort={"userid":-1}
http://192.168.0.189:50081/private/crud/person?filter={"userid":{$gt:"c000"}}&sort={"userid":-1}&top=3

可惜的是bson表达式中有些字符是url禁止的，所以必须预先处理一下。可以用公网的UrlEncoder在线转换：

   {"userid":"c001"} -> %7B%22userid%22%3A%22c001%22%7D

在程序里可以用软件工具："com.github.tasubo" % "jurl-tools" % "0.6"  URLEncode.encode(xyz)

   val sort ="""|{userid:-1}""".stripMarginval getAllRequest = HttpRequest(HttpMethods.GET,uri = "http://192.168.0.189:50081/public/crud/person?sort="+URLEncode.encode(sort),).addHeader(authentication)

blob服务的api Route：

      pathPrefix("blob") {(get & path(Remaining)) { id =>val filtr = equal("id", id)val futOptPic: CancelableFuture[Option[MGOBlob]] = repository.getOneDocument(filtr).value.value.runToFuture.map {eodoc =>eodoc match {case Right(odoc) => odoc match {case Some(doc) =>if (doc == null) Noneelse mgoGetBlobOrNone(doc, "photo")case None => None}case Left(_) => None}}onComplete(futOptPic) {case Success(optBlob) => optBlob match {case Some(blob) =>withoutSizeLimit {encodeResponseWith(Gzip) {complete(HttpEntity(ContentTypes.`application/octet-stream`,ByteArrayToSource(blob.getData)))}}case None => complete(StatusCodes.NotFound)}case Failure(err) => complete(err)}} ~(post &  parameter('id)) { id =>withoutSizeLimit {decodeRequest {extractDataBytes { bytes =>val fut = bytes.runFold(ByteString()) { case (hd, bs) =>hd ++ bs}onComplete(fut) {case Success(b) =>val doc = Document("id" -> id, "photo" -> b.toArray)val futmsg = repository.insert(doc).value.value.runToFuture.map {eoc =>eoc match {case Right(oc) => oc match {case Some(c) => c.toString()case None => "insert may not complete!"}case Left(err) => err.getMessage}}complete(futmsg)case Failure(err) => complete(err)}}}}}} 

注意：MongoRoute[M]是个范类型。我希望对任何Model的Route只需要指定M即可，如：

  implicit val personDao = new MongoRepo[Person]("testdb","person", Some(Person.fromDocument))implicit val picDao = new MongoRepo[Photo]("testdb","photo", None)...  pathPrefix("public") {(pathPrefix("crud")) {new MongoRoute[Person]("person")(personDao).route ~new MongoRoute[Photo]("photo")(picDao).route}}

是否省力多了？但是，回到原来问题：blob类型在整个移动过程中都不需要进行格式转换。所以id字段名称是指定的，这点在设计表结构时要注意。

如何测试一个httpserver还是比较头痛的。用浏览器只能测试GET，其它POST,PUT,DELETE应该怎么测试？其实可以用curl：

curl -i -X GET 
curl -i -X GET 
curl -i -X DELETE 
curl -i -X POST -H 'Content-Type: application/json' -d '{"name": "New item", "year": "2009"}' 
curl -i -X PUT -H 'Content-Type: application/json' -d '{"name": "Updated item", "year": "2010"}' 

下面写两个客户端分别测试crud和blob：

TestCrudClient.scala

import akka.actor._
import akka.http.scaladsl.model.headers._import scala.concurrent._
import scala.concurrent.duration._
import akka.http.scaladsl.Http
import akka.http.scaladsl.marshalling._
import akka.http.scaladsl.model._
import akka.stream.ActorMaterializer
import com.github.tasubo.jurl.URLEncode
import com.datatech.rest.mongo.MongoModels.Person
import de.heikoseeberger.akkahttpjson4s.Json4sSupport
import org.json4s.jackson
import com.datatech.sdp.mongo.engine.MGOClasses._trait JsonCodec extends Json4sSupport {import org.json4s.DefaultFormatsimport org.json4s.ext.JodaTimeSerializersimplicit val serilizer = jackson.Serializationimplicit val formats = DefaultFormats ++ JodaTimeSerializers.all
}
object JsConverters extends JsonCodecobject TestCrudClient {type UserInfo = Map[String,Any]def main(args: Array[String]): Unit = {import JsConverters._implicit val system = ActorSystem()implicit val materializer = ActorMaterializer()// needed for the future flatMap/onComplete in the endimplicit val executionContext = system.dispatcherval authorization = headers.Authorization(BasicHttpCredentials("johnny", "p4ssw0rd"))val authRequest = HttpRequest(HttpMethods.POST,uri = "http://192.168.0.189:50081/auth",headers = List(authorization))val futToken: Future[HttpResponse] = Http().singleRequest(authRequest)val respToken = for {resp <- futTokenjstr <- resp.entity.dataBytes.runFold("") {(s,b) => s + b.utf8String}} yield jstrval jstr =  Await.result[String](respToken,2 seconds)println(jstr)scala.io.StdIn.readLine()val authentication = headers.Authorization(OAuth2BearerToken(jstr))val sort ="""|{userid:-1}""".stripMarginval getAllRequest = HttpRequest(HttpMethods.GET,uri = "http://192.168.0.189:50081/public/crud/person?sort="+URLEncode.encode(sort),).addHeader(authentication)val futGetAll: Future[HttpResponse] = Http().singleRequest(getAllRequest)println(Await.result(futGetAll,2 seconds))scala.io.StdIn.readLine()var bf ="""|{"userid":"c888"}""".stripMarginprintln(URLEncode.encode(bf))val delRequest = HttpRequest(HttpMethods.DELETE,uri = "http://192.168.0.189:50081/public/crud/person?filter="+URLEncode.encode(bf)).addHeader(authentication)val futDel: Future[HttpResponse] = Http().singleRequest(delRequest)println(Await.result(futDel,2 seconds))scala.io.StdIn.readLine()bf ="""|{"userid":"c001"}""".stripMarginval getRequest = HttpRequest(HttpMethods.GET,uri = "http://192.168.0.189:50081/public/crud/person?filter="+URLEncode.encode(bf),).addHeader(authentication)val futGet: Future[HttpResponse] = Http().singleRequest(getRequest)println(Await.result(futGet,2 seconds))scala.io.StdIn.readLine()val tiger = Person("c001","tiger chan",Some(56))val john = Person("c002", "johnny dep", Some(60))val peter = Person("c003", "pete brad", Some(58))val susan = Person("c004", "susan boyr", Some(68),Some(mgoDate(1950,11,5)) )val ns = Person("c004", "susan boyr", Some(68),Some(mgoDate(1950,11,5)) )val saveRequest = HttpRequest(HttpMethods.POST,uri = "http://192.168.0.189:50081/public/crud/person").addHeader(authentication)val futPost: Future[HttpResponse] =for {reqEntity <- Marshal(peter).to[RequestEntity]response <- Http().singleRequest(saveRequest.copy(entity=reqEntity))} yield responseprintln(Await.result(futPost,2 seconds))scala.io.StdIn.readLine()var set ="""| {$set:|   {|    name:"tiger the king",|    age:18|   }| }""".stripMarginval updateRequest = HttpRequest(HttpMethods.PUT,uri = "http://192.168.0.189:50081/public/crud/person?filter="+URLEncode.encode(bf)+"&set="+URLEncode.encode(set)+"&many=true").addHeader(authentication)val futUpdate: Future[HttpResponse] = Http().singleRequest(updateRequest)println(Await.result(futUpdate,2 seconds))scala.io.StdIn.readLine()val repRequest = HttpRequest(HttpMethods.PUT,uri = "http://192.168.0.189:50081/public/crud/person?filter="+URLEncode.encode(bf)).addHeader(authentication)val futReplace: Future[HttpResponse] =for {reqEntity <- Marshal(susan).to[RequestEntity]response <- Http().singleRequest(updateRequest.copy(entity=reqEntity))} yield responseprintln(Await.result(futReplace,2 seconds))scala.io.StdIn.readLine()system.terminate()}}

TestFileClient.scala

import akka.stream._
import java.nio.file._
import java.io._
import akka.http.scaladsl.model.headers._
import scala.concurrent._
import com.datatech.rest.mongo.FileStreaming._
import scala.concurrent.duration._
import akka.actor.ActorSystem
import akka.http.scaladsl.marshalling.Marshal
import akka.http.scaladsl.model._
import akka.http.scaladsl.Http
import akka.stream.scaladsl.{FileIO, Source}
import scala.util._case class FileUtil(implicit sys: ActorSystem) {import sys.dispatcherimplicit val mat = ActorMaterializer()def createEntity(file: File): RequestEntity = {require(file.exists())val formData =Multipart.FormData(Source.single(Multipart.FormData.BodyPart("test",HttpEntity(MediaTypes.`application/octet-stream`, file.length(), FileIO.fromPath(file.toPath, chunkSize = 100000)), // the chunk size here is currently critical for performanceMap("filename" -> file.getName))))Await.result(Marshal(formData).to[RequestEntity], 3 seconds)}def uploadFile(request: HttpRequest, dataEntity: RequestEntity) = {implicit val mat = ActorMaterializer()import sys.dispatcherval futResp = Http(sys).singleRequest(//   Gzip.encodeMessage(request.copy(entity = dataEntity)   //.addHeader(`Content-Encoding`(HttpEncodings.gzip))//   ))futResp.andThen {case Success(r@HttpResponse(StatusCodes.OK, _, entity, _)) =>entity.dataBytes.map(_.utf8String).runForeach(println)case Success(r@HttpResponse(code, _, _, _)) =>println(s"Upload request failed, response code: $code")r.discardEntityBytes()case Success(_) => println("Unable to Upload file!")case Failure(err) => println(s"Upload failed: ${err.getMessage}")}}def downloadFileTo(request: HttpRequest, destPath: String) = {//  val req = request.addHeader(`Content-Encoding`(HttpEncodings.gzip))val futResp = Http(sys).singleRequest(request)  //.map(Gzip.decodeMessage(_))futResp.andThen {case Success(r@HttpResponse(StatusCodes.OK, _, entity, _)) =>entity.withoutSizeLimit().dataBytes.runWith(FileIO.toPath(Paths.get(destPath))).onComplete { case _ => println(s"Download file saved to: $destPath") }case Success(r@HttpResponse(code, _, _, _)) =>println(s"Download request failed, response code: $code")r.discardEntityBytes()case Success(_) => println("Unable to download file!")case Failure(err) => println(s"Download failed: ${err.getMessage}")}}}object TestFileClient  {type UserInfo = Map[String,Any]def main(args: Array[String]): Unit = {implicit val system = ActorSystem()implicit val materializer = ActorMaterializer()// needed for the future flatMap/onComplete in the endimplicit val executionContext = system.dispatcherval helloRequest = HttpRequest(uri = "http://192.168.0.189:50081/")val authorization = headers.Authorization(BasicHttpCredentials("johnny", "p4ssw0rd"))val authRequest = HttpRequest(HttpMethods.POST,uri = "http://192.168.0.189:50081/auth",headers = List(authorization))val futToken: Future[HttpResponse] = Http().singleRequest(authRequest)val respToken = for {resp <- futTokenjstr <- resp.entity.dataBytes.runFold("") {(s,b) => s + b.utf8String}} yield jstrval jstr =  Await.result[String](respToken,2 seconds)println(jstr)scala.io.StdIn.readLine()val authentication = headers.Authorization(OAuth2BearerToken(jstr))val entity = HttpEntity(ContentTypes.`application/octet-stream`,fileStreamSource("/Users/tiger/pictures/MeTiger.png",1024))//val chunked = HttpEntity.Chunked.fromData(ContentTypes.`application/octet-stream`,fileStreamSource("/Users/tiger/pictures/MeTiger.png",1024))val uploadRequest = HttpRequest(HttpMethods.POST,
//      uri = "http://192.168.0.189:50081/private/file?filename=tiger.jpg",uri = "http://192.168.0.189:50081/public/crud/photo/blob?id=tiger.jpg",).addHeader(authentication)//upload fileAwait.ready(FileUtil().uploadFile(uploadRequest,entity),2 seconds)//Await.ready(FileUtil().uploadFile(uploadRequest,chunked),2 seconds)val dlRequest = HttpRequest(HttpMethods.GET,
//      uri = "http://192.168.0.189:50081/api/file/mypic.jpg",uri = "http://192.168.0.189:50081/public/crud/photo/blob/tiger.jpg",).addHeader(authentication)FileUtil().downloadFileTo(dlRequest, "/users/tiger-macpro/cert3/mypic.jpg")scala.io.StdIn.readLine()system.terminate()}}

下面是本次示范中的源代码：

build.sbt

name := "rest-mongo"version := "0.1"scalaVersion := "2.12.8"scalacOptions += "-Ypartial-unification"
val akkaVersion = "2.5.23"
val akkaHttpVersion = "10.1.8"libraryDependencies ++= Seq("com.typesafe.akka" %% "akka-http"   % "10.1.8","com.typesafe.akka" %% "akka-stream" % "2.5.23","com.pauldijou" %% "jwt-core" % "3.0.1","de.heikoseeberger" %% "akka-http-json4s" % "1.22.0","org.json4s" %% "json4s-native" % "3.6.1","com.typesafe.akka" %% "akka-http-spray-json" % "10.1.8","com.typesafe.scala-logging" %% "scala-logging" % "3.9.0","org.slf4j" % "slf4j-simple" % "1.7.25","org.json4s" %% "json4s-jackson" % "3.6.7","org.json4s" %% "json4s-ext" % "3.6.7",// for scalikejdbc"org.scalikejdbc" %% "scalikejdbc"       % "3.2.1","org.scalikejdbc" %% "scalikejdbc-test"   % "3.2.1"   % "test","org.scalikejdbc" %% "scalikejdbc-config"  % "3.2.1","org.scalikejdbc" %% "scalikejdbc-streams" % "3.2.1","org.scalikejdbc" %% "scalikejdbc-joda-time" % "3.2.1","com.h2database"  %  "h2" % "1.4.199","com.zaxxer" % "HikariCP" % "2.7.4","com.jolbox" % "bonecp" % "0.8.0.RELEASE","com.typesafe.slick" %% "slick" % "3.3.2",//for cassandra 3.6.0"com.datastax.cassandra" % "cassandra-driver-core" % "3.6.0","com.datastax.cassandra" % "cassandra-driver-extras" % "3.6.0","com.lightbend.akka" %% "akka-stream-alpakka-cassandra" % "1.1.0",//for mongodb 4.0"org.mongodb.scala" %% "mongo-scala-driver" % "2.6.0","com.lightbend.akka" %% "akka-stream-alpakka-mongodb" % "1.1.0","ch.qos.logback"  %  "logback-classic"   % "1.2.3","io.monix" %% "monix" % "3.0.0-RC3","org.typelevel" %% "cats-core" % "2.0.0-M4","com.github.tasubo" % "jurl-tools" % "0.6"
)

MongoHttpServer.scala

package com.datatech.rest.mongoimport akka.actor._
import akka.stream._
import akka.http.scaladsl.Http
import akka.http.scaladsl.server.Directives._
import pdi.jwt._
import AuthBase._
import MockUserAuthService._
import org.mongodb.scala._import scala.collection.JavaConverters._
import MongoModels._
import MongoRepo._
import MongoRoute._object MongoHttpServer extends App {implicit val httpSys = ActorSystem("httpSystem")implicit val httpMat = ActorMaterializer()implicit val httpEC = httpSys.dispatcherval settings: MongoClientSettings = MongoClientSettings.builder().applyToClusterSettings(b => b.hosts(List(new ServerAddress("localhost")).asJava)).build()implicit val client: MongoClient = MongoClient(settings)implicit val personDao = new MongoRepo[Person]("testdb","person", Some(Person.fromDocument))implicit val picDao = new MongoRepo[Photo]("testdb","photo", None)implicit val authenticator = new AuthBase().withAlgorithm(JwtAlgorithm.HS256).withSecretKey("OpenSesame").withUserFunc(getValidUser)val route =path("auth") {authenticateBasic(realm = "auth", authenticator.getUserInfo) { userinfo =>post { complete(authenticator.issueJwt(userinfo))}}} ~pathPrefix("private") {authenticateOAuth2(realm = "private", authenticator.authenticateToken) { validToken =>FileRoute(validToken).route// ~ ...}} ~pathPrefix("public") {(pathPrefix("crud")) {new MongoRoute[Person]("person")(personDao).route ~new MongoRoute[Photo]("photo")(picDao).route}}val (port, host) = (50081,"192.168.0.189")val bindingFuture = Http().bindAndHandle(route,host,port)println(s"Server running at $host $port. Press any key to exit ...")scala.io.StdIn.readLine()bindingFuture.flatMap(_.unbind()).onComplete(_ => httpSys.terminate())}

ModalBase.scala

package com.datatech.rest.mongotrait ModelBase[E] {def to: E
}

MongoModel.scala

package com.datatech.rest.mongo
import org.mongodb.scala._
import com.datatech.sdp.mongo.engine._
import MGOClasses._object MongoModels {case class Person(userid: String = "",name: String = "",age: Option[Int] = None,dob: Option[MGODate] = None,address: Option[String] = None) extends ModelBase[Document] {import org.mongodb.scala.bson._override def to: Document = {var doc = Document("userid" -> this.userid,"name" -> this.name)if (this.age != None)doc = doc + ("age" -> this.age.get)if (this.dob != None)doc = doc + ("dob" -> this.dob.get)if (this.address != None)doc = doc + ("address" -> this.address.getOrElse(""))doc}}object Person {val fromDocument: Document => Person = doc => {val keyset = doc.keySetPerson(userid = doc.getString("userid"),name = doc.getString("name"),age = mgoGetIntOrNone(doc,"age").asInstanceOf[Option[Int]],dob =  {if (keyset.contains("dob"))Some(doc.getDate("dob"))else None },address =  mgoGetStringOrNone(doc,"address"))}}case class Photo (id: String,photo: Option[MGOBlob]) extends ModelBase[Document] {override def to: Document = {var doc = Document("id" -> this.id)if (photo != None)doc = doc + ("photo" -> this.photo)doc}}object Photo {def fromDocument: Document => Photo = doc => {val keyset = doc.keySetPhoto(id = doc.getString("id"),photo = mgoGetBlobOrNone(doc, "photo"))}}}

MongoRepo.scala

package com.datatech.rest.mongo
import org.mongodb.scala._
import org.bson.conversions.Bson
import org.mongodb.scala.result._
import com.datatech.sdp.mongo.engine._
import MGOClasses._
import MGOEngine._
import MGOCommands._
import com.datatech.sdp.result.DBOResult.DBOResult
import MongoModels._object MongoRepo {class MongoRepo[R](db:String, coll: String, converter: Option[Document => R])(implicit client: MongoClient) {def getAll(next:Option[String],sort:Option[String],fields:Option[String],top:Option[Int]): DBOResult[Seq[R]] = {var res = Seq[ResultOptions]()next.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_FILTER,Some(Document(b)))}sort.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_SORT,Some(Document(b)))}fields.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_PROJECTION,Some(Document(b)))}top.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_LIMIT,None,b)}val ctxFind = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_QUERY).setCommand(Find(andThen = res))mgoQuery[Seq[R]](ctxFind,converter)}def query(filtr: Bson, next:Option[String],sort:Option[String],fields:Option[String],top:Option[Int]): DBOResult[Seq[R]] = {var res = Seq[ResultOptions]()next.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_FILTER,Some(Document(b)))}sort.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_SORT,Some(Document(b)))}fields.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_PROJECTION,Some(Document(b)))}top.foreach {b => res = res :+ ResultOptions(FOD_TYPE.FOD_LIMIT,None,b)}val ctxFind = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_QUERY).setCommand(Find(filter = Some(filtr),andThen = res))mgoQuery[Seq[R]](ctxFind,converter)}def getOneDocument(filtr: Bson): DBOResult[Document] = {val ctxFind = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_QUERY).setCommand(Find(filter = Some(filtr),firstOnly = true))mgoQuery[Document](ctxFind,converter)}def insert(doc: Document): DBOResult[Completed] = {val ctxInsert = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_UPDATE).setCommand(Insert(Seq(doc)))mgoUpdate[Completed](ctxInsert)}def delete(filter: Bson): DBOResult[DeleteResult] = {val ctxDelete = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_UPDATE).setCommand(Delete(filter))mgoUpdate[DeleteResult](ctxDelete)}def update(filter: Bson, update: Bson, many: Boolean): DBOResult[UpdateResult] = {val ctxUpdate = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_UPDATE).setCommand(Update(filter,update,None,!many))mgoUpdate[UpdateResult](ctxUpdate)}def replace(filter: Bson, row: Document): DBOResult[UpdateResult] = {val ctxUpdate = MGOContext(dbName = db,collName=coll).setActionType(MGO_ACTION_TYPE.MGO_UPDATE).setCommand(Replace(filter,row))mgoUpdate[UpdateResult](ctxUpdate)}}}

MongoRoute.scala

package com.datatech.rest.mongo
import akka.http.scaladsl.server.Directivesimport scala.util._
import org.mongodb.scala._
import com.datatech.sdp.file.Streaming._
import org.mongodb.scala.result._
import MongoRepo._
import akka.stream.ActorMaterializer
import com.datatech.sdp.result.DBOResult._
import org.mongodb.scala.model.Filters._
import com.datatech.sdp.mongo.engine.MGOClasses._
import monix.execution.CancelableFuture
import akka.util._
import akka.http.scaladsl.model._
import akka.http.scaladsl.coding.Gzip
object MongoRoute {class MongoRoute[M <: ModelBase[Document]](val pathName: String)(repository: MongoRepo[M])(implicit c: MongoClient, m: Manifest[M], mat: ActorMaterializer) extends Directives with JsonConverter {import monix.execution.Scheduler.Implicits.globalvar dbor: DBOResult[Seq[M]] = _var dbou: DBOResult[UpdateResult] = _val route = pathPrefix(pathName) {pathPrefix("blob") {(get & path(Remaining)) { id =>val filtr = equal("id", id)val futOptPic: CancelableFuture[Option[MGOBlob]] = repository.getOneDocument(filtr).value.value.runToFuture.map {eodoc =>eodoc match {case Right(odoc) => odoc match {case Some(doc) =>if (doc == null) Noneelse mgoGetBlobOrNone(doc, "photo")case None => None}case Left(_) => None}}onComplete(futOptPic) {case Success(optBlob) => optBlob match {case Some(blob) =>withoutSizeLimit {encodeResponseWith(Gzip) {complete(HttpEntity(ContentTypes.`application/octet-stream`,ByteArrayToSource(blob.getData)))}}case None => complete(StatusCodes.NotFound)}case Failure(err) => complete(err)}} ~(post &  parameter('id)) { id =>withoutSizeLimit {decodeRequest {extractDataBytes { bytes =>val fut = bytes.runFold(ByteString()) { case (hd, bs) =>hd ++ bs}onComplete(fut) {case Success(b) =>val doc = Document("id" -> id, "photo" -> b.toArray)val futmsg = repository.insert(doc).value.value.runToFuture.map {eoc =>eoc match {case Right(oc) => oc match {case Some(c) => c.toString()case None => "insert may not complete!"}case Left(err) => err.getMessage}}complete(futmsg)case Failure(err) => complete(err)}}}}}} ~(get & parameters('filter.?,'fields.?,'sort.?,'top.as[Int].?,'next.?)) {(filter,fields,sort,top,next) => {dbor = {filter match {case Some(fltr) => repository.query(Document(fltr),next,sort,fields,top)case None => repository.getAll(next,sort,fields,top)}}val futRows = dbor.value.value.runToFuture.map {eolr =>eolr match {case Right(olr) => olr match {case Some(lr) => lrcase None => Seq[M]()}case Left(_) => Seq[M]()}}complete(futureToJson(futRows))}} ~ post {entity(as[String]) { json =>val extractedEntity: M = fromJson[M](json)val doc: Document = extractedEntity.toval futmsg = repository.insert(doc).value.value.runToFuture.map {eoc =>eoc match {case Right(oc) => oc match {case Some(c) => c.toString()case None => "insert may not complete!"}case Left(err) => err.getMessage}}complete(futmsg)}} ~ (put & parameter('filter,'set.?, 'many.as[Boolean].?)) { (filter, set, many) =>val bson = Document(filter)if (set == None) {entity(as[String]) { json =>val extractedEntity: M = fromJson[M](json)val doc: Document = extractedEntity.toval futmsg = repository.replace(bson, doc).value.value.runToFuture.map {eoc =>eoc match {case Right(oc) => oc match {case Some(d) => s"${d.getMatchedCount} matched rows, ${d.getModifiedCount} rows updated."case None => "update may not complete!"}case Left(err) => err.getMessage}}complete(futureToJson(futmsg))}} else {set match {case Some(u) =>val ubson = Document(u)dbou = repository.update(bson, ubson, many.getOrElse(true))case None =>dbou = Left(new IllegalArgumentException("missing set statement for update!"))}val futmsg = dbou.value.value.runToFuture.map {eoc =>eoc match {case Right(oc) => oc match {case Some(d) => s"${d.getMatchedCount} matched rows, ${d.getModifiedCount} rows updated."case None => "update may not complete!"}case Left(err) => err.getMessage}}complete(futureToJson(futmsg))}} ~ (delete & parameters('filter, 'many.as[Boolean].?)) { (filter,many) =>val bson = Document(filter)val futmsg = repository.delete(bson).value.value.runToFuture.map {eoc =>eoc match {case Right(oc) => oc match {case Some(d) => s"${d.getDeletedCount} rows deleted."case None => "delete may not complete!"}case Left(err) => err.getMessage}}complete(futureToJson(futmsg))}}}}