scala application conf environment variables

How to get return value? Can some please explain how environment variables work in Scala and explain how to refernce the environement variables from application.conf. For AWS deployment, the particulars of how you inject environment variables into the container will depend on how you're running the container. I named my project configuration. scala typesafe config - How to load conf file from classpath not from top level resources, How to read a JSON file into a Map, using Scala. I wasn't happy with how Daniel Cukiers solution did not allow defaults and overrides, so I changed it around to make full use of those. In the above file, you bucket the configurations related to spark/mysql under the respective headers to improve the readability. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. How do you manage your own comments on a foreign codebase? How to declare and access local variables in scala template in play framework? New to Scala so apologies for such trivial questions. Play will automatically convert this into a JDBC URL for you if you are using one of the built in database connection pools. Change). 586), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Testing native, sponsored banner ads on Stack Overflow (starting July 6), Temporary policy: Generative AI (e.g., ChatGPT) is banned. We and our partners use cookies to Store and/or access information on a device. How to use environment variables and application.conf in Scala? How to calculate the reverberation time RT60 given dimensions of a room? What is a good way to set up a project in Scala which uses different configuration depending on environments. @ozeebee for some reason this is not working. Go to the Clever Cloud console, and find the app you want to fine tune under its organization. Using Case Classes to Structure YourData, And the Oscar for best deb scalero goesto, Background Processing with Akka Cluster: ClusterSingletonManager. config/HOCON.md at main lightbend/config GitHub It will become hidden in your post, but will still be visible via the comment's permalink. User Guide. Play will automatically convert this into a JDBC URL for you if you are using one of the built in database connection pools. How to define and use custom annotations in Scala. Environment Variables. Do large language models know what they are talking about? How to use java8 lambda and function in scala, How to properly use Scala Play Anorm and Option[String] to insert NULL SQL, How to reaload scala application after code change using actors and sbt, How to use monocle to modify a nested map and another field in scala. How can we compare expressive power between two Turing-complete languages? Developers use AI tools, they just dont trust them (Ep. The following guide explains how to set up your application to run on Clever Cloud. 1. secret02 { Still, if you consider that these configs should be allowed to be overridden by environment variables, you would in practice end up with: And then you would also need a file full of environment variables somewhere, possibly in an Ansible template or a Helm chart YAML file, to actually inject the values. as a set of properties. Feel free to clone and experiment. Assuming that you're using ConfigFactory.load (or having Akka load the configuration for you), the environment variables will "just work", assuming that the JVM process is actually running with the environment variables set. When running via sbt run, the environment is set by the shell in which you're running sbt. Assuming that you're using ConfigFactory.load (or having Akka load the configuration for you), the environment variables will "just work", assuming that the JVM process is actually running with the environment variables set.. To get the value of e.g., db-config.url, you should just be able to do val config = ConfigFactory.load() // or if in an actor, context.system.config val dbUrl = config . Not the answer you're looking for? You may run into this error during deployments: By default, Play! value = super-secret02 Find centralized, trusted content and collaborate around the technologies you use most. Certain Spark settings can be configured through environment variables, which are read from the conf/spark-env.sh script in the directory where Spark is installed (or conf/spark-env.cmd on Windows). Step 1: Verify Your Java Installation First of all, you need to have Java Software Development Kit (SDK) installed on your system. spark-on-k8s-operator/docs/user-guide.md at master - GitHub You have two options to fix this problem: The two solutions do the job, you can pick your favorite. How to use Environment Variables and application.conf files in Scala? To run a script at the end of your deployment? If you dont want to use the default conf/application.conf configuration file, you can use the SBT_DEPLOY_GOAL environment variable SBT_DEPLOY_GOAL=-Dconfig.resource=clevercloud.conf. value = super-secret But, you say, I need a file format that non-developers can reasonably understand and edit. In the final act, how to drop clues without causing players to feel "cheated" they didn't find them sooner? code of conduct because it is harassing, offensive or spammy. So to get a multiplatform evil hack I combined them: This Works like a charm. Why do most languages use the same token for `EndIf`, `EndWhile`, `EndFunction` and `EndStructure`? That means it's looking for some username in that application.conf file and not finding it. Indeed, in this case I would say the direct approach I show above is not a good fit because the entire point of the separate config file format is having a separate config file format. specific config by environment in Scala - Stack Overflow Use typesafe Config. Does the DM need to declare a Natural 20? People usually have two objections to this: Helper libraries should never log. The default is development. For instance, one method takes a File for the directory parameter, and another method takes an Option[File] for that parameter. It will change the environment variables throughout the JVM (so make sure you reset any changes after your test), but will not alter your system environment. But I would also askare you sure the non-developers should be editing a config file? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Click to email a link to a friend (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on Reddit (Opens in new window), Click to share on Pocket (Opens in new window), https://github.com/DanielaSfregola/quiz-management-service/tree/master/akka-http-crud. For example: To emulate this in environment variables, you would typically have something like: This is, while arguable flatter and simpler in structure, also not as nice as the nested HOCON format. Decoding into strings, integers, and booleans is by contrast a no-brainer. Logging can be configured through log4j.properties. secret { Having a clear separation between configurations and code allow us to customise its execution to the environment where it runs in. Why not just get the configuration directly from environment variables? Why should I use object vs trait Dependencies and import it vs mixin to build definition? Redefining configurations as part of the command line parameters works in most of the cases, but it can be tedious when we have a lot of parameters to change. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Heres a little Scala application that prints all the environment variables and properties. The ability to specify multiple environment variables when calling a Process factory method works because the apply methods accept a varargs argument of the type (String, String)* for their last argument. For example if bash is your shell (this is worth trying in other Bourne-compatible shells), prefixing the environment variables with export, e.g. Refer to environment variables reference for more details on available environment variables on Clever Cloud. Loading a configuration in Scala - Jasper van Zandbeek's blog Create a Config object like this: Then create the application.conf file in src/main/resources folder: Now from anywhere in your application, you can access configuration: Config().getString("your_app.databaseUrl"), If you have your environment set up (e.g. How to read from textfile(String type data) map and load data into parquet format(multiple columns with different datatype) in Spark scala dynamically. secret02 { By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How to use Environment Variables in build.sbt? How can I fix missing conf files when using shadowJar and Scala dependencies? The following example shows how to run a shell script in a directory named /home/al/bin while also setting the PATH environment variable: To set multiple environment variables at one time, keep adding them at the end of the Process constructor: These examples work because of the overloaded apply methods in the Process object. Is Linux swap still needed with Ubuntu 22.04. The error occurs when we cannot find a bin to execute your project. To learn more, see our tips on writing great answers. Log the loaded config to easily understand what's going on when the application starts (masking secrets). 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Lottery Analysis (Python Crash Course, exercise 9-15), Name of a movie where a guy is committed to a hospital because he sees patterns in everything and has to make gestures so that the world doesn't end, international train travel in Europe for European citizens. How can I avoid mutable variables in Scala when using ZipInputStreams and ZipOutpuStreams? Some of our partners may process your data as a part of their legitimate business interest without asking for consent. scala - How to read array environment variable in application.conf Fail-fast, most configuration models should be loaded eagerly when the application starts, a wrong configuration would prevent the application from starting. This is an excerpt from the Scala Cookbook (partially modified for the internet). stage/dev/prod). The config bootstrap code doesn't test anything. It is basicaly used to define environment variables and helps in deploying same code in different environment. To add your private SSH key to access private dependencies? How to get Java/Scala system environment variables and properties | alvinalexander.com creating javabeans importing java code multiple constructors named and default parameters calling methods class casting equivalent of java .class rename classes on import private primary constructor try, catch, and finally syntax Using the same object for ObjectType and InputObjectType, Scalamock: Unable to mock function with typed parameter and multiple implicit variables, Wicket - get the value of a textbox filled using scala. Substitution fallback to environment variables Developers use AI tools, they just dont trust them (Ep. }, Hi srinivas, I am passing the parameter from command line, and it is also defined in the config file. A typical project will have the configuration file in src/main/resources/application.conf. Environment variables Clever Cloud allows you to define environment variables that will be injected in your application's environment. CC_SBT_TARGET_DIR=play environment variable. Using directly a default with getOrElse over the sys.env Map ( val myenv: Map [String, String] = sys.env ): sys.env.getOrElse (envVariable, defaultValue) You get the content of the envVariable or, if it does not exist, the defaultValue. value = super-secret How to build spark application using Scala IDE and Maven? Do large language models know what they are talking about? Environment variables that are set in spark-env.sh will not be reflected in the YARN Application Master process in cluster mode. Thank you! Calculation on consecutive array elements, Play Framework - Upgrade to Web socket manually. Scalamock 3. 1) in the example you provided, 3 different configurations would be detected and identified by the following paths: my.secret.value, my.secret01.value, my.secret02.value. Conventional override by system properties. Why is Scala's syntax for tuples so unusual? Next, to create a new environment variable, click New. Lets start with the basic case scenario: given a file, we want to read it and parse its values to use them in our code. We just removed a special hidden, easy-to-forget configuration flag, a separately maintained configuration file, and an entire library from our project. Configuration - Spark 2.4.0 Documentation - Apache Spark Why do most languages use the same token for `EndIf`, `EndWhile`, `EndFunction` and `EndStructure`? 2) I have personally never used a conf file in a json format, but according to the typesafe config library, it is indeed supported so you should be able to make it work. Once suspended, yawaramin will not be able to comment or publish posts until their suspension is removed. Assuming the enviroment variables Heroku passes you are REDIS_HOST and REDIS_PORT, then in your application.conf you can do the following: secret { I've done extensive research and if you want to set variables that are available in all GUI applications, your only option is /etc/launchd.conf. What is a good way to set up a project in Scala which uses different configuration depending on environments. Why are lights very bright in most passenger trains, especially at night? Refer to git deployments for more details. (throw NotImplementedError) if a certain environment variable we require is undefined. See where the error says application.conf: Key not found: 'username'? If you have a single repository with multiple modules, then you can specify which module to run with CC_SBT_TARGET_DIR environment variable. Scala app configuration with environment variables # scala SCALA applications have historically used the Typesafe/ Lightbend Config HOCON format as configuration files. value = super-secret02 How can I avoid mutable variables in Scala when using ZipInputStreams and ZipOutpuStreams? Solution Specify the environment variables when calling a Process factory method (an apply method in the Process object). In the future, I'll want to deploy to AWS in docker container. The basic idea is to use Java's System.getenv to read environment variable values, handle missing values, and parse them into strong types. But other database libraries and frameworks, such as Slick or Hibernate, may not support this format natively. This loads the default values from the reference.conf file so you only need to override values when the default values aren't appropriate. Environment variables | Clever Cloud Documentation Copyright 2023 www.appsloveworld.com. Please note that environment.plist does not work for applications launched via Spotlight. Files can look like: The file is loaded by passing in its path as a JVM property: And parsed at application startup using the accompanying library. To integrate scala into java using maven, how do compare available plugins? international train travel in Europe for European citizens. : another.conf ), we just need to indicate a different file name and path to load (e.g. }. application you have to set a secret in your conf/application.conf the environment variable name depends on your Play2! Heroku Scala Support | Heroku Dev Center We can now parse the file and use the obtained configuration in our script: By default, the ConfigFactory looks for a configuration file called application.conf. How do I create an sbt task to generate code, then include these generated managed sources in my root project? Dont forget to Update Changes at the end of the menu. Let's say my DEV conf application.conf looks like this: Then for the PROD, I could have another file called prod.conf: Note that I override only the settings that change in the PROD environment (some-other-setting is thus the same as in DEV). Go ahead and click Generate the application. Add a comment. what would be the folder structure in the project as in where the conf file etc needs to put? Config is the most widely used configuration library in Scala. If you look at your application.conf file yourself, you can see that indeed there is no setting in there called username. I've created a simple project to demonstrate this technique. We're a place where coders share, stay up-to-date and grow their careers. Reading configurations in Scala There are multiple ways to read the configuration files in Scala but here are two of my most preferred approaches depending on the structure of the. { What is the purpose of installing cargo-contract and using it to create Ink! To get the value of e.g., db-config.url, you should just be able to do. You need to set one or more environment variables when running an external command in a Scala application. } Environment variables can be used to set per-machine settings, such as the IP address, through the conf/spark-env.sh script on each node. I found that a combination of the two dirty hacks by Edward Campbell and anonymous works best, as one of the does not work under linux, one does not work under windows 7. Scala - Environment Setup - Online Tutorials Library Here's a little Scala application that prints all the environment variables and properties. For use in scenarios where you need to set specific environment values for unit tests, you might find the following hack useful. Why schnorr signatures uses H(R||m) instead of H(m)? Play! Why a kite flying at 1000 feet in "figure-of-eight loops" serves to "multiply the pulling effect of the airflow" on the ship to which it is attached? Bash Setting environment variables on OS X, environment.plist does not work for applications launched via Spotlight. This quick post shows what environment variables and properties are available. Does application.conf file follow a simple json structure of definition ? Setup Spark Development Environment - IntelliJ and Scala April 21, 2018 , 7:13 pm , Big Data, Data Engineering As part of this blog post we will see detailed instructions about setting up development environment for Spark and Hadoop application development using Windows. All you need to do is- bucket these configurations under different headers. So here we're using Typesafe Config's default loading mechanism to achieve this. Author of Learn Type Driven Development: https://www.packtpub.com/application-development/learn-type-driven-development, // Print out the names of the env vars we read from the system, Scala for-comprehensions for resource management. How to understand and use scala macro, and write a more complex function, Just downloaded the Scala Lift chat application and use the instructions to run it, but it fails. There are multiple ways to read the configuration files in Scala but here are two of my most preferred approaches depending on the structure of the configurations: Use this approach when you have to specify multiple interrelated configurations (wherein some of them might be related to each other). Are you sure you want to hide this comment? This means the application config can refer to the reference config in its substitutions. In this article we have described different approaches of defining specific settings. If thats the case, you may try using the dynamic JDBC_DATABASE_URL in place of DATABASE_URL in the configuration like this: reference https://www.playframework.com/documentation/2.8.x/ProductionHeroku. I need to specifically have different databases for development, test and production environment (similar to what is done in Rails). In this article we will describe different approaches to load configurations in Scala and how they can be combined together: loading configurations from a file, from command line parameters or from environment variables. Please have a look at deploy scala apps for a complete documentation on sbt deployment options. I think reading environment variables is an exception. On Heroku, you would just use config vars. 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Youll see that you can convert it to Java very easily: Heres a list of all of the environment variables on my current (old) Mac OS X system, given as output from the environmentVars print loop: Heres a list of all of the environment variables on my current Mac OS X system, given as output from the properties print loop: To get a specific Java or Scala environment variable, write code like this: To access a system property from a Java or Scala application, write code like this: If you needed information on Scala or Java system properties or environment variables, I hope this has been helpful. Note that the format that we are using here is not json, but a json superset. Does Oswald Efficiency make a significant difference on RC-aircraft? The consent submitted will only be used for data processing originating from this website. In particular, we have presented a simple script that combines all these approaches in one: the script loads configurations first from environment variables, then from command line parameters and finally from a configuration file. 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Scala - how to use variables in a multi-line string literal, How to use gcs-connector and google-cloud-storage alongside in Scala, How do I exclude values when doing json Reads and Writes in my Play2 scala application, Scala : How to use Global Config case class across application. To switch from the DEV to the PROD conf, simply pass a system property with the name of the config file to load: In DEV, no need to pass it since application.conf will be loaded by default. scala - Play framework overriding `application.conf` values based on How to maximize the monthly 1:1 meeting with my boss? How do I use scala and scalatest to see if a list contains an object with a field matching a specific value, How to merge all part files in a folder created by SPARK data frame and rename as folder name in scala, Extending generic type with Ordered trait makes sbt compiler issue 'diverging implicit expansion for type' error. Then you can either pass the new value through environment variable or -D. $ foo=baz activator run $ activator run -Dfoo=baz Option 2: In you application.conf have a placeholder to read the environment variable. Scala - specific config by environment in Scala - iTecNote For further actions, you may consider blocking this person and/or reporting abuse. 35 What is a good way to set up a project in Scala which uses different configuration depending on environments. value = super-secret01 You need Git on your computer to deploy via this tool.
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