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/Cargo.toml              |  8 +++
 examples/hierarchical-env/config/default.toml     | 17 ++++++
 examples/hierarchical-env/config/development.toml |  4 ++
 examples/hierarchical-env/config/production.toml  | 13 +++++
 examples/hierarchical-env/src/main.rs             | 16 ++++++
 examples/hierarchical-env/src/settings.rs         | 70 +++++++++++++++++++++++
 6 files changed, 128 insertions(+)
 create mode 100644 examples/hierarchical-env/Cargo.toml
 create mode 100644 examples/hierarchical-env/config/default.toml
 create mode 100644 examples/hierarchical-env/config/development.toml
 create mode 100644 examples/hierarchical-env/config/production.toml
 create mode 100644 examples/hierarchical-env/src/main.rs
 create mode 100644 examples/hierarchical-env/src/settings.rs

diff --git a/examples/hierarchical-env/Cargo.toml b/examples/hierarchical-env/Cargo.toml
new file mode 100644
index 0000000..bbcd4a6
--- /dev/null
+++ b/examples/hierarchical-env/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "hierarchical-env"
+version = "0.1.0"
+
+[dependencies]
+config = { path = "../../" }
+serde_derive = "^1.0.8"
+serde = "^1.0.8"
diff --git a/examples/hierarchical-env/config/default.toml b/examples/hierarchical-env/config/default.toml
new file mode 100644
index 0000000..dbb2f30
--- /dev/null
+++ b/examples/hierarchical-env/config/default.toml
@@ -0,0 +1,17 @@
+[database]
+url = "postgres://postgres@localhost"
+
+[sparkpost]
+key = "sparkpost-dev-key"
+token = "sparkpost-dev-token"
+url = "https://api.sparkpost.com"
+version = 1
+
+[twitter]
+consumer_token = "twitter-dev-consumer-key"
+consumer_secret = "twitter-dev-consumer-secret"
+
+[braintree]
+merchant_id = "braintree-merchant-id"
+public_key = "braintree-dev-public-key"
+private_key = "braintree-dev-private-key"
diff --git a/examples/hierarchical-env/config/development.toml b/examples/hierarchical-env/config/development.toml
new file mode 100644
index 0000000..f07dcc2
--- /dev/null
+++ b/examples/hierarchical-env/config/development.toml
@@ -0,0 +1,4 @@
+debug = true
+
+[database]
+echo = true
diff --git a/examples/hierarchical-env/config/production.toml b/examples/hierarchical-env/config/production.toml
new file mode 100644
index 0000000..cd0c4cf
--- /dev/null
+++ b/examples/hierarchical-env/config/production.toml
@@ -0,0 +1,13 @@
+debug = false
+
+[sparkpost]
+key = "sparkpost-prod-key"
+token = "sparkpost-prod-token"
+
+[twitter]
+consumer_token = "twitter-prod-consumer-key"
+consumer_secret = "twitter-prod-consumer-secret"
+
+[braintree]
+public_key = "braintree-prod-public-key"
+private_key = "braintree-prod-private-key"
diff --git a/examples/hierarchical-env/src/main.rs b/examples/hierarchical-env/src/main.rs
new file mode 100644
index 0000000..65f727d
--- /dev/null
+++ b/examples/hierarchical-env/src/main.rs
@@ -0,0 +1,16 @@
+extern crate config;
+extern crate serde;
+
+#[macro_use]
+extern crate serde_derive;
+
+mod settings;
+
+use settings::Settings;
+
+fn main() {
+    let settings = Settings::new();
+
+    // Print out our settings
+    println!("{:?}", settings);
+}
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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