[英]akka-http and JsonEntityStreamingSupport
I'm currently doing some experiment with akka and its persistency stack, wrapped with akka-http stack. 我目前正在对akka及其持久性堆栈(用akka-http堆栈包装)进行一些实验。
Note: For persistency, i'm using non-official plugin to persist Akka FSM to mongodb. 注意:为了保持持久性,我正在使用非官方插件将Akka FSM持久化到mongodb。
But my problem is using JsonEntityStreamingSupport
, recommended by akka to serve Source
as json . 但是我的问题是使用JsonEntityStreamingSupport
推荐的JsonEntityStreamingSupport来将Source
用作json 。
In my case, i have this piece of code 就我而言,我有这段代码
implicit val jsonEntityStreamingSupport: JsonEntityStreamingSupport = EntityStreamingSupport.json()
val readJournal = PersistenceQuery(system).readJournalFor[ScalaDslMongoReadJournal](MongoReadJournal.Identifier)
val route =
path("workflows") {
get {
complete(readJournal.currentPersistenceIds())
}
}
Http().bindAndHandle(route, "localhost", 8081)
But unfortunately, I came with this error: 但是不幸的是,我遇到了这个错误:
$ curl localhost:8081/workflows
curl: (56) Recv failure: Connection reset by peer
I do not see any errors or logs which could lead to information about why server is closing connection. 我没有看到任何错误或日志,这些错误或日志可能会导致有关服务器为何关闭连接的信息。
Does anyone already done this kind of experiment ? 有没有人做过这种实验?
I'm testing it with akka 2.4.16 and akka-http 10.0.5 我正在用akka 2.4.16和akka-http 10.0.5进行测试
Ok, I figured it out. 好的,我知道了。
readJournal.currentPersistenceIds()
gives me a Source[String, NotUsed]
. readJournal.currentPersistenceIds()
给我一个Source[String, NotUsed]
。
But, as it is specified in akka-http specs , 但是,正如akka-http规范中指定的那样 ,
This is wrong since we try to render JSON, but String is not a valid top level element we need to provide an explicit Marshaller[String, ByteString] if we really want to render a list of strings. 这是错误的,因为我们尝试呈现JSON,但是String不是有效的顶级元素,如果我们确实要呈现字符串列表,则需要提供显式的Marshaller [String,ByteString]。
So I have to provide a Marshaller
for it. 因此,我必须为此提供一名Marshaller
。 For example, as giving by those same tests : 例如,通过这些相同的测试给出:
implicit val stringFormat = Marshaller[String, ByteString] { ec ⇒ s ⇒
Future.successful {
List(Marshalling.WithFixedContentType(ContentTypes.`application/json`, () ⇒
ByteString("\"" + s + "\"")) // "raw string" to be rendered as json element in our stream must be enclosed by ""
)
}
}
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