From a02114f9ea17e0161b2b334c1c57bac451a70266 Mon Sep 17 00:00:00 2001
From: Ryan Leckey <ryan@launchbadge.com>
Date: Fri, 16 Jun 2017 11:45:35 -0700
Subject: Add hierarchial config example

---
 examples/hierarchical-env/src/settings.rs | 70 +++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 examples/hierarchical-env/src/settings.rs

(limited to 'examples/hierarchical-env/src/settings.rs')

diff --git a/examples/hierarchical-env/src/settings.rs b/examples/hierarchical-env/src/settings.rs
new file mode 100644
index 0000000..43897b3
--- /dev/null
+++ b/examples/hierarchical-env/src/settings.rs
@@ -0,0 +1,70 @@
+use std::env;
+use config::{Config, File, Environment};
+
+#[derive(Debug, Deserialize)]
+struct Database {
+    url: String,
+}
+
+#[derive(Debug, Deserialize)]
+struct Sparkpost {
+    key: String,
+    token: String,
+    url: String,
+    version: u8,
+}
+
+#[derive(Debug, Deserialize)]
+struct Twitter {
+    consumer_token: String,
+    consumer_secret: String,
+}
+
+#[derive(Debug, Deserialize)]
+struct Braintree {
+    merchant_id: String,
+    public_key: String,
+    private_key: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Settings {
+    debug: bool,
+    database: Database,
+    sparkpost: Sparkpost,
+    twitter: Twitter,
+    braintree: Braintree,
+}
+
+impl Settings {
+    pub fn new() -> Self {
+        let mut s = Config::new();
+
+        // Start off by merging in the "default" configuration file
+        s.merge(File::with_name("config/default")).unwrap();
+
+        // Add in the current environment file
+        // Default to 'development' env
+        // Note that this file is _optional_
+        let env = env::var("RUN_MODE").unwrap_or("development".into());
+        s.merge(File::with_name(&format!("config/{}", env)).required(false)).unwrap();
+
+        // Add in a local configuration file
+        // This file shouldn't be checked in to git
+        s.merge(File::with_name("config/local").required(false)).unwrap();
+
+        // Add in settings from the environment (with a prefix of APP)
+        // Eg.. `APP_DEBUG=1 ./target/app` would set the `debug` key
+        s.merge(Environment::with_prefix("app")).unwrap();
+
+        // You may also programmatically change settings
+        s.set("database.url", "postgres://").unwrap();
+
+        // Now that we're done, let's access our configuration
+        println!("debug: {:?}", s.get_bool("debug"));
+        println!("database: {:?}", s.get::<String>("database.url"));
+
+        // You can deserialize (and thus freeze) the entire configuration as
+        s.deserialize().unwrap()
+    }
+}
-- 
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