Kmongo Ktor服务器的配置问题(Kotlin server + Mongo)

Question

我在用Ktor和KMongo。当我在本地主机中启动服务器并制作一个简单的'get‘请求时，我遇到了一个问题。对于服务器上数据库的配置，引用并不是非常明确和完整的-- https://litote.org/kmongo/。有人知道如何解决这个问题吗？我认为这是一个简单的配置问题，但我不知道如何解决它。我不使用Spring.

这是连接到KmongoDB的代码：

package com.progettoetere.Routes

import io.ktor.application.
import io.ktor.response.respondText
import io.ktor.routing.*
import kotlinx.coroutines.runBlocking

import org.litote.kmongo.eq
import org.litote.kmongo.reactivestreams.*
import org.litote.kmongo.coroutine.*

fun Route.survey(){

    //ramo per i survey
    route("/survey"){

        //ritorno tutti i questionari
        get("/"){



                        val client = KMongo.createClient().coroutine //client whit Kotli coroutines
                        val database = client.getDatabase("test") //get a test database
                        val colSurvey = database.getCollection<Survey>() //get the collection of surveys

                        //start coroutine
                        runBlocking {

                            //get one survey for DEBUG with id == 1023
                            val dato: Survey? = colSurvey.findOne(Survey::id_survey eq 1023)

                            //check the survey
                            if (dato != null) {
                                call.respondText { "The survey is present" }
                            } else {
                                call.respondText { "The survey is not present" }
                            }
                        }

}

当我创建客户端实例时会发生错误：

val = KMongo.createClient().coroutine

这是堆栈错误：

2019-03-11 20:58:22.334 [main] INFO  Application - Responding at http://0.0.0.0:8080
2019-03-11 20:58:27.633 [nettyCallPool-4-1] INFO  org.mongodb.driver.cluster - Cluster created with settings {hosts=[localhost:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
2019-03-11 20:58:27.655 [nettyCallPool-4-1] DEBUG org.mongodb.driver.cluster - Updating cluster description to  {type=UNKNOWN, servers=[{address=localhost:27017, type=UNKNOWN, state=CONNECTING}]
2019-03-11 20:58:27.666 [cluster-ClusterId{value='5c86bde3cad88d4f128ae82c', description='null'}-localhost:27017] DEBUG org.mongodb.driver.connection - Closing connection connectionId{localValue:1}
2019-03-11 20:58:27.668 [cluster-ClusterId{value='5c86bde3cad88d4f128ae82c', description='null'}-localhost:27017] INFO  org.mongodb.driver.cluster - Exception in monitor thread while connecting to server localhost:27017
com.mongodb.MongoSocketOpenException: Exception opening socket
    at com.mongodb.internal.connection.AsynchronousSocketChannelStream$OpenCompletionHandler.failed(AsynchronousSocketChannelStream.java:117)
    at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:128)
    at sun.nio.ch.Invoker$2.run(Invoker.java:218)
    at sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.ConnectException: Connessione rifiutata
    at sun.nio.ch.UnixAsynchronousSocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.UnixAsynchronousSocketChannelImpl.finishConnect(UnixAsynchronousSocketChannelImpl.java:252)
    at sun.nio.ch.UnixAsynchronousSocketChannelImpl.finish(UnixAsynchronousSocketChannelImpl.java:198)
    at sun.nio.ch.UnixAsynchronousSocketChannelImpl.onEvent(UnixAsynchronousSocketChannelImpl.java:213)
    at sun.nio.ch.EPollPort$EventHandlerTask.run(EPollPort.java:293)

Answer 1

问题解决了。我确信Mongo服务器是从Ktor服务器开始的，实际上我必须手动启动Mongo服务器。一旦Mongo服务器从终端启动，Ktor服务器就能够在浏览器获取或卷曲请求期间与mongo通信。