在Play 2.6的conf文件中Hikari，Quill和Postgres之间的冲突

Question

当我运行我的Play应用程序（这似乎是我现在的生活故事）时，我得到的似乎是一个奇怪的错误。前几天，我遇到了this issue，解决了这个问题，能够运行演变并创建表格，然后遇到以下问题：

java.lang.RuntimeException: Property driver does not exist on target class com.zaxxer.hikari.HikariConfig

这是我当前application.conf中的相关部分：

db.default {
    dataSourceClassName = org.postgresql.ds.PGSimpleDataSource
    url = "jdbc:postgresql://localhost:5432/app-users?user=root&password=root"
    driver = org.postgresql.Driver
    username = root
    password = root
    databaseName = app-users
    portNumber = 5432
    serverName = localhost
    connectionTimeout = 30000
}

我做了some digging，发现Hikari期待driverClassName（以及其他一些差异）。 Hikari docs和Quill docs说这样的东西应该在application.conf中：

dataSourceClassName=org.postgresql.ds.PGSimpleDataSource
dataSource.user=root
dataSource.password=root
dataSource.databaseName=app-users
dataSource.portNumber=5432
dataSource.serverName=localhost

但是，当我拥有它时，演变将无法进行。它们只会在我拥有它时才会运行。由于演进正在运行，似乎它正在连接到数据库。那么为什么我会收到一条消息说它不能呢？有没有办法为Hikari和Postgres / Quill提供单独的数据库配置？

完整的错误消息：

play.api.UnexpectedException: Unexpected exception[IllegalStateException: Failed to load data source for config: 'Config(SimpleConfigObject({"connectionTimeout":30000,"dataSourceClassName":"org.postgresql.ds.PGSimpleDataSource","databaseName":"mack-users","driver":"org.postgresql.Driver","password":"root","portNumber":5432,"serverName":"localhost","url":"jdbc:postgresql://localhost:5432/mack-users?user=root&password=root","username":"root"}))']
    at play.core.server.DevServerStart$$anon$1.reload(DevServerStart.scala:186)
    at play.core.server.DevServerStart$$anon$1.get(DevServerStart.scala:124)
    at play.core.server.AkkaHttpServer.modelConversion(AkkaHttpServer.scala:183)
    at play.core.server.AkkaHttpServer.handleRequest(AkkaHttpServer.scala:189)
    at play.core.server.AkkaHttpServer.$anonfun$createServerBinding$3(AkkaHttpServer.scala:106)
    at akka.stream.impl.fusing.MapAsync$$anon$24.onPush(Ops.scala:1191)
    at akka.stream.impl.fusing.GraphInterpreter.processPush(GraphInterpreter.scala:512)
    at akka.stream.impl.fusing.GraphInterpreter.processEvent(GraphInterpreter.scala:475)
    at akka.stream.impl.fusing.GraphInterpreter.execute(GraphInterpreter.scala:371)
    at akka.stream.impl.fusing.GraphInterpreterShell.runBatch(ActorGraphInterpreter.scala:584)
Caused by: java.lang.IllegalStateException: Failed to load data source for config: 'Config(SimpleConfigObject({"connectionTimeout":30000,"dataSourceClassName":"org.postgresql.ds.PGSimpleDataSource","databaseName":"mack-users","driver":"org.postgresql.Driver","password":"root","portNumber":5432,"serverName":"localhost","url":"jdbc:postgresql://localhost:5432/mack-users?user=root&password=root","username":"root"}))'
    at io.getquill.JdbcContextConfig.dataSource(JdbcContextConfig.scala:24)
    at io.getquill.PostgresJdbcContext.<init>(PostgresJdbcContext.scala:17)
    at io.getquill.PostgresJdbcContext.<init>(PostgresJdbcContext.scala:18)
    at io.getquill.PostgresJdbcContext.<init>(PostgresJdbcContext.scala:19)
    at db.db.package$DBContext.<init>(package.scala:6)
    at MyComponents.ctx$lzycompute(MyApplicationLoader.scala:25)
    at MyComponents.ctx(MyApplicationLoader.scala:25)
    at MyComponents.userService$lzycompute(MyApplicationLoader.scala:28)
    at MyComponents.userService(MyApplicationLoader.scala:28)
    at MyComponents.applicationController$lzycompute(MyApplicationLoader.scala:35)
Caused by: java.lang.RuntimeException: Property driver does not exist on target class com.zaxxer.hikari.HikariConfig
    at com.zaxxer.hikari.util.PropertyElf.setProperty(PropertyElf.java:131)
    at com.zaxxer.hikari.util.PropertyElf.lambda$setTargetFromProperties$0(PropertyElf.java:57)
    at java.util.Hashtable.forEach(Hashtable.java:879)
    at com.zaxxer.hikari.util.PropertyElf.setTargetFromProperties(PropertyElf.java:52)
    at com.zaxxer.hikari.HikariConfig.<init>(HikariConfig.java:132)
    at io.getquill.JdbcContextConfig.dataSource(JdbcContextConfig.scala:21)
    at io.getquill.PostgresJdbcContext.<init>(PostgresJdbcContext.scala:17)
    at io.getquill.PostgresJdbcContext.<init>(PostgresJdbcContext.scala:18)
    at io.getquill.PostgresJdbcContext.<init>(PostgresJdbcContext.scala:19)
    at db.db.package$DBContext.<init>(package.scala:6)

DB /包

import io.getquill.{PostgresJdbcContext, SnakeCase}

package object db {
  class DBContext(config: String) extends PostgresJdbcContext(SnakeCase, config)

  trait Repository {
    val ctx: DBContext
  }
}

关于什么可能导致这个的任何想法？或者我错过了什么？

使用：

• 比例2.12.4
• 羽毛笔2.3.2
• 玩2.6.6
• Postgres JDBC驱动程序42.2.1
• PostgreSQL 10.2

我把Quill / Hikari期望的错误信息：

! @776d39n6c - Internal server error, for (GET) [/] ->

play.api.Configuration$$anon$1: Configuration error[Cannot connect to database [default]]
    at play.api.Configuration$.configError(Configuration.scala:156)
    at play.api.Configuration.reportError(Configuration.scala:990)
    at play.api.db.DefaultDBApi.$anonfun$connect$1(DefaultDBApi.scala:48)
    at play.api.db.DefaultDBApi.$anonfun$connect$1$adapted(DefaultDBApi.scala:42)
    at scala.collection.immutable.List.foreach(List.scala:389)
    at play.api.db.DefaultDBApi.connect(DefaultDBApi.scala:42)
    at play.api.db.DBApiProvider.get$lzycompute(DBModule.scala:86)
    at play.api.db.DBApiProvider.get(DBModule.scala:75)
    at play.api.db.DBComponents.dbApi(DBModule.scala:49)
    at play.api.db.DBComponents.dbApi$(DBModule.scala:49)
Caused by: play.api.Configuration$$anon$1: Configuration error[dataSource or dataSourceClassName or jdbcUrl is required.]
    at play.api.Configuration$.configError(Configuration.scala:156)
    at play.api.Configuration.reportError(Configuration.scala:990)
    at play.api.db.HikariCPConnectionPool.create(HikariCPModule.scala:63)
    at play.api.db.PooledDatabase.createDataSource(Databases.scala:199)
    at play.api.db.DefaultDatabase.dataSource$lzycompute(Databases.scala:123)
    at play.api.db.DefaultDatabase.dataSource(Databases.scala:121)
    at play.api.db.DefaultDatabase.getConnection(Databases.scala:142)
    at play.api.db.DefaultDatabase.getConnection(Databases.scala:138)
    at play.api.db.DefaultDBApi.$anonfun$connect$1(DefaultDBApi.scala:44)
    at play.api.db.DefaultDBApi.$anonfun$connect$1$adapted(DefaultDBApi.scala:42)
Caused by: java.lang.IllegalArgumentException: dataSource or dataSourceClassName or jdbcUrl is required.
    at com.zaxxer.hikari.HikariConfig.validate(HikariConfig.java:997)
    at play.api.db.HikariCPConfig.toHikariConfig(HikariCPModule.scala:136)
    at play.api.db.HikariCPConnectionPool.$anonfun$create$1(HikariCPModule.scala:50)
    at scala.util.Try$.apply(Try.scala:209)
    at play.api.db.HikariCPConnectionPool.create(HikariCPModule.scala:47)
    at play.api.db.PooledDatabase.createDataSource(Databases.scala:199)
    at play.api.db.DefaultDatabase.dataSource$lzycompute(Databases.scala:123)
    at play.api.db.DefaultDatabase.dataSource(Databases.scala:121)
    at play.api.db.DefaultDatabase.getConnection(Databases.scala:142)
    at play.api.db.DefaultDatabase.getConnection(Databases.scala:138)

Answer 1

不幸的是，Hikari和Play并没有使用完全相同的命名约定来设置他们的数据源，例如Quill期望一个简单的dataSourceClassName但是Play想要它以db.default.dataSourceClassName这样的格式。据我所知，没有办法重新配置你的配置，以便它满足它们，你可能不希望出于以下原因：

Play实际上使用Hikari作为池化数据源，因此当您通过db.default创建数据库时，您实际上已经创建了一个池数据源。当您使用裸配置调用PostgresJdbcContext时，您实际上要求Quill创建一个完全独立的连接池。不确定这是否是你想要的，但我假设你只想要一个连接池。

Quill实际上暴露了一个接受DataSource的构造函数，所以你可以做的就是使用Play创建的Database并将其直接传递给Quill：

import io.getquill.{PostgresJdbcContext, SnakeCase}
import com.zaxxer.hikari.HikariDataSource
import play.api.db.Database

package object db {
    class DBContext(db: Database) extends PostgresJdbcContext(SnakeCase, db.dataSource.asInstanceOf[HikariDataSource])
}

这应该可以解决您的问题，并且只会创建一个连接池。您可以通过依赖注入获取Database对象。

你必须在这里做一个丑陋的asInstanceOf，因为PostgresJdbcContext需要dataSource来实现Closeable，这是DataSource类没有实现的。我遇到了类似的问题，并没有找到更优雅的方法来做到这一点。