如何在 Grails 3 中使用外部 .groovy 配置文件

Question

Externalized Configuration 中的第 24.3 节表示 .properties 或 .yml 文件可用于外部配置，但我希望我的外部配置是 .groovy 文件，就像我拥有的​​ application.groovy 文件一样已从.yml 转换。我怎样才能做到这一点？

Grails 版本 3.2.0.M2

更新：

我能够根据@Michal_Szulc 提供的答案完成这项工作

请注意，ConfigSlurper 需要当前环境才能正常工作。另请注意，这些更改将针对my_grails_app/grails-app/init/my_grails_app/Application.groovy 文件进行，而不是my_grails_app/grails-app/conf/application.groovy 文件，如果您从.yml 配置转换为.groovy 配置，您可能拥有的文件。

package my_grails_app

import grails.boot.GrailsApp
import grails.boot.config.GrailsAutoConfiguration
import org.springframework.context.EnvironmentAware
import org.springframework.core.env.Environment
import org.springframework.core.env.MapPropertySource

class Application extends GrailsAutoConfiguration implements EnvironmentAware {
    static void main( String[] args ) {
        GrailsApp.run( Application, args )
    }

    @Override
    void setEnvironment( Environment environment ) {
        def appName = grails.util.Metadata.current.getApplicationName()

        // The value of this environment variable should be the absolute path to an external .groovy config file like /opt/my_grails_app/my_grails_app-config.groovy.
        def envVarName = "MY_GRAILS_APP_CONFIG"

        // If you don't want to use an environment variable you can specify your external .groovy config file here, but the environment variable will still be checked first.
        def dfltAppConfigFileName = "/opt/${ appName }/${ appName }-config.groovy"
        def appConfigFile = null
        def loadDfltConfig = false

        // Try to load config specified by the environment variable first
        println "Checking the environment variable ${ envVarName } for the configuration file location..."
        def envVarVal = System.getenv( envVarName ) ?: System.getProperty( envVarName )
        if( envVarVal ) {
            appConfigFile = new File( envVarVal )
            if( !appConfigFile.exists() ) {
                println "The configuration file ${ appConfigFile } specified by the environment variable ${ envVarName } does not exist.  Checking for the default configuration file ${ dfltAppConfigFileName } instead..."
                appConfigFile = null
                loadDfltConfig = true
            }
        } else {
            println "The environment variable ${ envVarName } which specifies the configuration file to be loaded does not exist.  Checking for the default configuration file ${ dfltAppConfigFileName } instead..."
            appConfigFile = null
            loadDfltConfig = true
        }

        // Try loading the default config file since we couldn't find one specified by the environment variable
        if( loadDfltConfig ) {
            appConfigFile = new File( dfltAppConfigFileName )
            if( !appConfigFile.exists() ) {
                println "The default configuration file ${ dfltAppConfigFileName } does not exist."
                appConfigFile = null
            }
        }

        // Load the config file if it exists, otherwise exit
        if( appConfigFile ) {
            println "Loading configuration file ${ appConfigFile }"
            def config = new ConfigSlurper( environment.activeProfiles.first() ).parse( appConfigFile.toURI().toURL() )
            environment.propertySources.addFirst( new MapPropertySource( "${ appName }-config", config ) )
        } else {
            println "No configuration file found.  Exiting."
            System.exit( 1 )
        }

Answer 1

我找到了this thread 和 Graeme Rocher 的引用：

Grails 3 使用 Spring 的属性源概念，所以它会解决 来自系统、环境和最后的属性 application.yml/application.groovy

Clyde Balneaves的代码：

class Application extends GrailsAutoConfiguration implements EnvironmentAware {
    static void main(String[] args) {
    GrailsApp.run(Application)
    }

    @Override
    void setEnvironment(Environment environment) {
    //Set up Configuration directory
    def krakenHome = System.getenv('KRAKEN_HOME') ?: System.getProperty('KRAKEN_HOME') ?: "/opt/kraken"

    println ""
    println "Loading configuration from ${krakenHome}"
    def appConfigured = new File(krakenHome, 'KrakenConfig.groovy').exists()
    println "Loading configuration file ${new File(krakenHome, 'KrakenConfig.groovy')}"
    println "Config file found : " + appConfigured

    if (appConfigured) {
        def config = new ConfigSlurper().parse(new File(krakenHome, 'KrakenConfig.groovy').toURL())
        environment.propertySources.addFirst(new MapPropertySource("KrakenConfig", config))
    }
    }
}

Answer 2

也许你也可以尝试这种方式（覆盖运行方法）

import grails.boot.GrailsApp
import grails.boot.config.GrailsAutoConfiguration
import grails.util.Environment
import grails.util.Holders
import org.springframework.boot.CommandLineRunner

class Application extends GrailsAutoConfiguration implements CommandLineRunner {

    static void main(String[] args) {
        GrailsApp.run(Application, args)
    }

    @Override
    void run(final String... args) throws Exception {
        println "Running in ${Environment.current.name}"

        // Get configuration from Holders.
        def config = Holders.getConfig()
        def locations = config.grails.config.locations
        locations.each {
            String configFileName = it.split("file:")[1]
            File configFile = new File(configFileName)
            if (configFile.exists()) {
                config.merge(new ConfigSlurper(Environment.current.name).parse(configFile.text))
            }
        }
    }
}

Answer 3

我认为您正在寻找的（并且更容易/更清洁）是Grails External Config plugin。