. We'll cover hashing, mining, consensus and more. Here we have set up APP_INITIALIZER and a service to handle grabbing and making configurations available. Mock server, a nodejs local server that you run before starting Angular. This is the place you will write production config variables. Do you want to have the job done? { It assumes you already have a working application, with a module and everything set up. I have created an repo for this. Moving the files to localdata folder using angular.json assets: The config URL now looks like this localdata/config.json. We can create an HTTP interceptor for localdata to make use of any other localdata. My guess is that the there is something weird going on with the references of that service. }. Create a class AppConfig and name the file 'app.config.ts' (you can use a name of your choice). Since we already provided req in the res.render call, this is sufficient. If we navigate to http://localhost:4200/assets/config/config.dev.json, we find we have an unfortunate situation. (It's rare, but it happens). Let's first reduce the size of the server.ts suggested by Angular Docs, to have only the ngExpressEngine, export it, and create a separate express app. Angular is Google's open source framework for crafting high-quality front-end web applications. it is as simple as global.WebConfig. On a root folder, e.g. Most often folks are using APP_INITIALIZER to set up pre-boot configuration. The classical way to add configurations from an environment file.

const jsonFile = 'assets/config/config.json'; Stack Overflow question with sample code: https://stackoverflow.com/questions/64837808/how-to-load-runtime-configuration-and-use-it-in-an-angular-module. If something on the server goes wrong, I have to build and test? AppConfig.Settings = JSON.parse(response); It's the only place that does not get checked at design time, and throws a silent 404 at runtime. 4. The environment then only needs to decide the location of the configuration file. One good scenario, is serving a multilingual Angular app, using the same build. It would seem the imports are being executed before the factory provided to 'APP_INITIALIZER' was being is resolved. If we use PLATFORM_INITIALIZER, it has been injected in platformBrowserDynamic which only runs browser platform. First issue to fix is the type of WebConfig, declare a const in the same service file: The other issue is the extreme case of slow configuration. The URL of the config file, cannot be part of the configuration keys! If the config file needed in Route Resolve or Guard fails to be served, we're blocked. class MockAppConfig { To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Theres also the question of the configuration file being widely readable by the browser. xmlhttp.open("GET", url, false); Having an external configuration allows us to make one build, and rely on the host server to feed the missing configuration file, reducing time and resources needed. Looking at this github issue, there are a few cases where configuration data is not available to other services that are initialized at app startup. On browser platform, it all works. Welcome! On StackBlitz however, it is too slow. If we follow the documentation Server-side rendering (SSR) with Angular Universal it walks you through building the server in src folder, and generating the server in a build process. isServed is my new configuration property to "distinguish remote configuration" from fallback one. This is common in deploying custom software per client. // after defining withError property in IConfig // if in error, return fall back from environment, // choose the output path where the main.js will end up, // don't delete because there will be other files, // set engine, we called it AppEngine in server.ts, // set views directory, the clientside build output, // expose the configs path as localdata (or whatever you choose to name it), // for this line to work, install @types/express, // make it Optional to work on browser platform as well, // on ssr get a full url of current server, // on other servers this could be localhost, // if request does not have 'localdata' ignore, // require the json file sitting in localdata, // though don't lose the serverUrl, it's quite handy, // if on server, grab config without HTTP call, // configs/config.js file, named it "WebConfig" to avoid confusion, // set a static member for easier handling, // cast all keys as are, extend local Config. may be environment rebuild isn't such a bad idea after all :). What a mess! The WebConfig has no value initially, so it throws an "undefined" error. https://stackoverflow.com/a/49013534/6686446, The way this is happening is Http Interceptors sit between the HttpClient interface and the HttpBackend. To learn more, see our tips on writing great answers. This should allow us to inspect whether or not the configuration has been set correctly for any environment. Senior Software Engineer, This Dot bash loop to replace middle of string after a certain character, Blondie's Heart of Glass shimmering cascade effect. provide: APP_INITIALIZER, To tighten the loose ends though, the extreme case is produced locally with the following conditions: . But first: Without digressing beyond the scope of this article, reverse proxy and load balancing on production servers usually proxy https into http, and real.host.com into localhost. 3. For SSR, it needs to be injected in server platform. IN DEPTH DEV, INC. "", // TODO: create ConfigService and configFactory, // return observable, right now just http.get, // do something to reflect into local model, // if in error, set default fall back from environment, // if in error, return fall back from Config, // enabledBlocking for SSR, but also enabledNonBlocking is not as good as it sounds in this setup, // log the value of the configuration here, // if this is too soon, the result is undefined, // keep track of config, initialize with fall back Config, // in resolver, need to take 1 and return, // the first one will actually be the fallback, // the default Config with isServed: false, Project page with resolve Press J to jump to the feed. That translates to RxJS observable. Read the code comments as you go along.

The private method to cast configuration, should also return default configuration in case of failure. The extra configuration though does not have to match IConfig. Did someone find the solution? We can run above code on Stackblitz and go to route /project, Console will log "undefined." It's just a Boolean set to true in remote config. There are several ways you can handle this. deps: [AppConfig], global.WebConfig = require('./localdata/config.js'); The localdata in this case is a server folder, that contains the server config.js file. What I did instead was add a script in head of the index.html that would be parsed before the Angular files. Http injection in the constructor needs to be changed to HttpClient which is imported from angular/common/http; change the this.http.get to this.http.get < any >('env.json'), remove the map function after the http.get call, in the if (request) remove the map function, the json files need to be in the directory /src/app/config. Building, testing, works. }); You could set up the directory structure in such a way in assets where it isnt easily known where the initial config file is. 5. So we start in AppModule: (refer to Angular Initialization Tokens article). @anyones and @geekrumper I'm struggling with the same problem of variables being undefined in the constructor of other injectable services. You could play with file permissions. This is why enabledNonBlocking is useless in this setup, because the resolve service is blocking anyway.

This resulted in AngularFireModule.initializeApp(firebaseConfig) returning an error related to 'not providing projectId'. Here is an azure website example I set up, notice how the values in the header, are different than plain ones, because of cloud hosting setup: But before I add that to my Angular App, back to being obsessive about separation of concerns, this is not an Angular issue, thus it shall not belong to the app. But wait the config.js file must have an exports statement for that line to work. Huh? Instead, I think it's a good idea to use a single file, and update its content as part of an automated release pipeline. But it looks ugly. // notice it no longer needs to be injected, // in server.ts, or where you create the ngExpressEngine, referenced in master branch of Angular 13, Server-side rendering (SSR) with Angular Universal, Why component identifiers must be capitalized in React, Exploring how virtual DOM is implemented in React, Ukraine and In-Depths founder need your help, The external configuration is remote, thus a bit slower than local. And as the output below clearly shows, after the configuration load is completed, and the service is injected into another service, the configuration data is now in some.service for the asking! Also your links is horribly outdated, there is official support on GitHub for Build-Time Environments. I also have not found any good examples showing these cases of a config not available, so we cannot really be sure if those solutions have underlying architectural issues. Angular has a built-in environment system that allows you to specify configuration for multiple environments. in fact i put this file in same level as .gitignore file in my directory project. This allows for a separation between the code-base, and the different number of environments to which it's being deployed. Thank you for your help. A great walkthrough of this setup is found on Microsofts DevBlogs https://devblogs.microsoft.com/premier-developer/angular-how-to-editable-config-files/. * Use to get the data found in the second file (config file), * Use to get the data found in the first file (env file), * a) Loads "env.json" to get the current working environment (e.g. In res.render, I passed back response and request just in case I want to use them in Angular. The Router Module uses APP_INITIALIZER as referenced in master branch of Angular 13, and initialization functions are run in parallel according to source code. But it's imposed by my company's context. I am able to get the external json file in my unit test by mocking the AppConfig. https://devblogs.microsoft.com/premier-developer/angular-how-to-editable-config-files/, Learning to Draw 3D Shapes in Roblox Using Lua, Scripting With Lua in Roblox First Impressions. In a service file for ConfigService, lets add the http call to get the configuration file, and find out what we can do with the result. And the I'm adding the APOLLO_OPTIONS provider like this: I also have this AppConfigService which is initialized in APP_INITIALIZER: Method appConfigService.loadApplicationConfig() will just load some config properties from some json files depending on the environment (could also load it from specific environment.ts files). Expanding on StackBlitz Token Test Project, where the URL of the configuration had to be set to remote HTTP, building locally and testing for server, produced identical results. Treat it per project needs. You can use it to read configuration files like you do in other languages like Java, Python, Ruby, Php. Thanks for contributing an answer to Stack Overflow!

Now that we have everything in place to include configuration at runtime using a JSON file, all that's left to do is to replace that file with the environment-specific configuration, and it will be picked up when running the application. Even though this works quite well, the downside of this is that we need to recompile and reupload the artifacts for each environment to which we are planning to deploy. @skygan @lucasklaassen @pchiarato and anyone who using using http interceptor. It is relative. } Once we added the above service to an Angular application, we can hook it into Angular's APP_INITIALIZER: Wherever we need access to the environment-specific configuration, we can inject the ConfigService, and access the config property. @scottseeker How did you call config.load ?

The question is, where to place configuration during development. Often, a frontend application needs to communicate with a backend, whose URL can be different for each environment. There is a much simpler way if you're just looking to set global environment properties (host address for example): http://tattoocoder.com/angular-cli-using-the-environment-option/. 9 years of professional software development experience multi: true To overcome, extend the configuration, via shallow cloning.

To fix that, a separation between the general Config, and remote Config fallback may be needed, or a little bit of attention. If env is "development", the file is 'config.development.json'. Obviously this will not work! else when i did as your example, i got this error : Configuration file "env.json" could not be read. The observable in the current setup shall produce two values, the first is isServed set to false. You may add this file to .gitignore to your convenience. rev2022.7.21.42639. I am getting an error "Cannot read property load of undefined". So if we have two environments, we will need to make two builds. This token does not use dependencies, so the ConfigService ends up being a group of static elements, so no need to provide it anywhere. Proof that When all the sides of two triangles are congruent, the angles of those triangles must also be congruent (Side-Side-Side Congruence), How to encourage melee combat when ranged is a stronger option, Cardboard box giving me strange mesh errors, mv fails with "No space left on device" when the destination has 31 GB of space remaining, Laymen's description of "modals" to clients, in cricket, is it a no-ball if the batsman advances down the wicket and meets fulltoss ball above his waist, Grep excluding line that ends in 0, but not 10, 100 etc, Is there a way to generate energy using a planet's angular momentum. Import the AppRoutingModule into root AppModule, add a project component, and let's create the project resolver that returns an Observable of Boolean. Possible error: If you prefer, you can set error scenarios to reject(). return mockConfig[key]; Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. } Furthermore, on the host, we can serve different configuration files based on a route, and deploy once. could you please give us an example? At startup is where I mention above we need this, having the configuration available to load a URI to begin grabbing the rest of your configuration that might live on a data store. I am trying to load a configuration file (json) via a service using APP_INITIALIZER in Angular 8. Solution? @Priyesha, could you please elaborate your example with the mockConfig, maybe a complete example, thank you. A second property that identifies failure in Config is also a solution. Let's build an APP_INITIALIZER with minimum response: void. The downside is as you can guess, manual maintenance is needed. Connect and share knowledge within a single location that is structured and easy to search. Unless you rewrite the firebaseConfig in server.ts, There is example here: All these reads will be done before Angular2 starts up the application. ], @schmorrison that is a very easy way to do it, unfortunately, it doesn't work on ssr. The project resolve for example, should decide what to do with error: In ConfigService I will stop making a distinction between success and failure, they both are served. The extreme case I reached after multiple trials: A word of caution, leaving the InitialNavigation set to its default enabledNonBlocking will produce unexpected results in the resolve service. So creating a HttpClient using HttpBackend is bypassing the http interceptor. This is most common in multilingual or multinational sites, where for example, the app prefixed with /en-us/ would be slightly different from that of /en-au/. Example of how we read the values previously loaded from both files.

, // This can be used directly, for example in a template, // now, every ./configs/*.json will be accessed as /localdata/*.json, // if served with error, reroute or notify user, but do not block user. For loading the config, I created a Service [app-config-service] which looks like this: When I try to load the configuration, it looks like this: This error occures directly after loging in. Have you already found a better solution for this? In a real application, you probably need to inject the config in the services that are responsible for calling that environment-specific API, and use the API URL to build the endpoint URL. The default Config may be mistaken for ConfigService.Config, if ever used, the default fallback value is in place. The default fallback config looks as follows (in app/config.ts file): Back to the service, the CreateConfig should only try to cast, then set to a public property. This means we'll need to swap out the environment configuration after the artifacts are built. The only issue was: failure of remote URL meant blocking of app. GET localdata/config.prod.json NetworkError. @schmorrison, I was stuck on the same problem (I've got several configurable modules), I found an alternative way to load a configuration file before bootstrap: @dabbid oh wow, may be we're over killing it? configuration angular runtime initializer thoughts app haus coder config unfortunate readable situation file export class AppModule {, export class AppComponent implements OnInit {. I already tried by passing @input variable to webcomponent but since its changing the way currently other application using it I cant use this approach, By the way, in Angular 12, what changed is that now you no longer need a promise, you can return an observable directly from load function, Reading configuration files before application startup in Angular2 final release. bootstrap: [AppComponent] When planning to deploy an Angular application, you might have the need for some configuration that can be different for every environment that's hosting the application. Later will elaborate more on the strategy of how to handle the config file and its location. Now that we have a separate server, and the configuration file is not remote, why not provide the config and inject it in the ConfigService? Before we can include an actual APP_INITIALIZER, we will create a service that's responsible for fetching the config.json file using Angular's HttpClient. As often triggers posts I write, I was working on a project where I needed to store config files that were accessible without recompile. Allowed values are 'development' and 'production'. Options are: 'production' and 'development'; b) It will read a config JSON file based on what is found in env file. Remote server. according to my knowledge of promises whatever you return from a, Angular loading config with APP_INITIALIZER, How APIs can take the pain out of legacy system headaches (Ep. You can add as many variables you want in this JSON file. Interesting is also that the constructor of the app-config-service is called two times. Building the ssr uses the following angular.json settings. Is it same in Angular 11 or any easier solution already integrated ?? Can be an inhouse local server, or a staging server. After reading this article, you'll have a solid foundation upon which to explore platforms like Ethereum and Solana. Right? @smitelij Angular-CLI Environments are before Build, this example are before startup aka runtime! Taking it even further, we can deploy on multiple servers, excluding the configuration file, and let every remote server handle its own configuration file. return new Promise((resolve, reject) => { I forgot to set resolve(true) at the end of the Config Service. cannot use this method on StackBlitz.). While going directly to a URI and grabbing data from a data base or data store is fine for running applications, in my experience initial configuration is better served locally. Including the JSON file in the assets directory ensures it's being copied to the dist folder when running ng build without the need to make any changes to the angular.json file. One issue folks seem to have with this setup, is the availability of data on startup. resolve(true); How to do I get the configuration from the configuration service and set the uri in the graphql module? Uncaught TypeError: Cannot read property 'noImageFound' of undefined. Open source enthusiast. Clone with Git or checkout with SVN using the repositorys web address. Though you must be careful, use defer and stay local. The solution to that, if we see it backwards, should be like this: wait till this.configService.Config is ready. In the screenshot below we see that at initialization our service, after our config service is called, named some.service, does not have any configuration data and the method to load our configuration data isnt called until after our some.service is instantiated. We keep you up to date with advancements in the modern web through events, podcasts, and free content. Like this: Back to our Angular App, let's create a proper HTTP interceptor, to intercept localdata calls: And clean up ConfigService from any reference to our server. . But let's go on. There are a few ways you can handle this, what works for you is dependent on your comfort level and the types of data you have in your config. const xmlhttp = new XMLHttpRequest(); reject(Could not load file '${jsonFile}': ${JSON.stringify(response)}); Every time? must be: In this demonstration I will show you how to read data in Angular2 final release before application startup. configuration service runtime angular initializer thoughts app haus coder asking data service initializer angular configuration runtime thoughts app haus coder inject below code