126 lines
3.8 KiB
Dart
126 lines
3.8 KiB
Dart
library angel_configuration;
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import 'package:angel_framework/angel_framework.dart';
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import 'package:dotenv/dotenv.dart' as dotenv;
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import 'package:file/file.dart';
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import 'package:merge_map/merge_map.dart';
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import 'package:yaml/yaml.dart';
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final RegExp _equ = new RegExp(r'=$');
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final RegExp _sym = new RegExp(r'Symbol\("([^"]+)"\)');
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/// A proxy object that encapsulates a server's configuration.
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@proxy
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class Configuration {
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/// The [Angel] instance that loaded this configuration.
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final Angel app;
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Configuration(this.app);
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operator [](key) => app.configuration[key];
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operator []=(key, value) => app.configuration[key] = value;
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noSuchMethod(Invocation invocation) {
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if (invocation.memberName != null) {
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String name = _sym.firstMatch(invocation.memberName.toString()).group(1);
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if (invocation.isMethod) {
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return Function.apply(app.configuration[name],
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invocation.positionalArguments, invocation.namedArguments);
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} else if (invocation.isGetter) {
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return app.configuration[name];
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}
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}
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super.noSuchMethod(invocation);
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}
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}
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_loadYamlFile(Angel app, File yamlFile, Map<String, String> env) async {
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if (await yamlFile.exists()) {
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var config = loadYaml(await yamlFile.readAsString());
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if (config is! Map) {
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app.logger?.warning(
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'WARNING: The configuration at "${yamlFile.absolute.path}" is not a Map. Refusing to load it.');
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return;
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}
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Map<String, dynamic> out = {};
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for (String key in config.keys) {
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out[key] = _applyEnv(config[key], env ?? {}, app);
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}
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app.configuration.addAll(mergeMap(
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[
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app.configuration,
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out,
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],
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acceptNull: true,
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));
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}
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}
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_applyEnv(var v, Map<String, String> env, Angel app) {
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if (v is String) {
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if (v.startsWith(r'$') && v.length > 1) {
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var key = v.substring(1);
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if (env.containsKey(key))
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return env[key];
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else {
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app.logger?.warning(
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'Your configuration calls for loading the value of "$key" from the system environment, but it is not defined. Defaulting to `null`.');
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return null;
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}
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} else
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return v;
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} else if (v is Iterable) {
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return v.map((x) => _applyEnv(x, env ?? {}, app)).toList();
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} else if (v is Map) {
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return v.keys
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.fold<Map>({}, (out, k) => out..[k] = _applyEnv(v[k], env ?? {}, app));
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} else
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return v;
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}
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/// Dynamically loads application configuration from configuration files.
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///
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/// You can modify which [directoryPath] to search in, or explicitly
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/// load from a [overrideEnvironmentName].
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///
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/// You can also specify a custom [envPath] to load system configuration from.
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AngelConfigurer configuration(
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FileSystem fileSystem,
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{String directoryPath: "./config",
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String overrideEnvironmentName,
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String envPath}) {
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return (Angel app) async {
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Directory sourceDirectory = fileSystem.directory(directoryPath);
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var env = dotenv.env;
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var envFile = sourceDirectory.childFile(envPath ?? '.env');
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if (await envFile.exists()) {
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try {
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dotenv.load(envFile.absolute.uri.toFilePath());
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} catch (_) {
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app.logger?.warning(
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'WARNING: Found an environment configuration at ${envFile.absolute.path}, but it was invalidly formatted. Refusing to load it.');
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}
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}
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String environmentName = env['ANGEL_ENV'] ?? 'development';
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if (overrideEnvironmentName != null) {
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environmentName = overrideEnvironmentName;
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}
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var defaultYaml = sourceDirectory.childFile('default.yaml');
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await _loadYamlFile(app, defaultYaml, env);
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String configFilePath = "$environmentName.yaml";
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var configFile = sourceDirectory.childFile(configFilePath);
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await _loadYamlFile(app, configFile, env);
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app.container.singleton(new Configuration(app));
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};
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}
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