[英]How to collapse of Spray Directives
How can one collapse these directives as much as possible? 一个人如何尽可能地使这些指令崩溃?
I was able to collapse three directives into mainHeader but how can include authenticate and responseWithMediaType as well? 我能够将三个指令折叠到mainHeader中,但是又如何包括authenticate和responseWithMediaType?
val mainHeaders = cors & headerValueByName("Access_Token") & headerValueByName("Tenant_Name")
override def getLayer = path("api" / Segment / "model" / "layers") { modeledSystemName =>
mainHeaders { (accessToken, tenantName) =>
authenticate(validate(accessToken)) { authInfo =>
respondWithMediaType(`application/json`) {
get {
onComplete(service.getlayers(modeledSystemName, tenantName)) {
case Success(layers) => complete(layers)
//case Success(None) => complete(NotFound, "Release version not found")
case Failure(ex) => complete(InternalServerError, s"An error occurred: ${ex.getMessage}")
}
}
}
}
}
}
Spray routes are super compossible so you can do whatever you want. 喷涂路线非常复杂,因此您可以做任何想做的事情。 For example I would write this route like this: 例如,我将这样写这条路线:
val authWithHeader = headerValueByName("Access_Token")
.flatMap(accessToken => authenticate(validate(accessToken)))
val authenticatedJsonRoute = cors &
authWithHeader &
headerValueByName("Tenant_Name") &
respondWithMediaType(MediaTypes.`application/json`)
override val getLayer =
(get & path("api" / Segment / "model" / "layers")) { modeledSystemName =>
authenticatedJsonRoute { (authInfo, tenantName) =>
onComplete(service.getlayers(modeledSystemName, tenantName)) {
case Success(layers) => complete(layers)
//case Success(None) => complete(NotFound, "Release version not found")
case Failure(ex) => complete(InternalServerError, s"An error occurred: ${ex.getMessage}")
}
}
}
Let me explain this code. 让我解释一下这段代码。 First, I created the directive authWithHeader
that reads header value and then do authentication with this value. 首先,我创建了指令authWithHeader
,该指令读取标头值,然后使用该值进行身份验证。 It is super simple and all magic done by flatMap
. 它非常简单,并且所有的魔术都由flatMap
完成。
Then, I created authenticatedJsonRoute
which is just a composition of other simple directives. 然后,我创建了authenticatedJsonRoute
,它只是其他简单指令的组合。 Composition magic is done with &
operator (I pronounce it as "and then" in this context) and those directives will be executed in order. 合成魔术是通过&
运算符完成的(在这种情况下,我将其发音为“然后是”),并且这些指令将按顺序执行。
Lastly, I used my composed directive, authenticatedJsonRoute
, in a complete route getLayer
. 最后,我在完整的路由getLayer
使用了我的组合指令authenticatedJsonRoute
。
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