Add initial Action (#40)

* Add initial Github action.

src/config.rs

@@ -1,40 +1,76 @@
-extern crate toml;
-use serde_derive::Deserialize;
+extern crate envconfig;
+extern crate envconfig_derive;
+
+use serde::Deserialize;
+
+use envconfig::Envconfig;
 use std::fs;
+use std::vec::Vec;
+
+#[cfg(test)]
+extern crate serial_test;
+#[cfg(test)]
+use serial_test::serial;
 
 #[cfg(test)]
 mod tests {
     use super::*;
 
     #[test]
-    fn parse_config() {
-        let file = "./examples/config.toml";
-        parse(&file);
+    #[should_panic]
+    #[serial]
+    fn load_config_with_missing_sendgrid_api_key() {
+        std::env::remove_var("SENDGRID_API_KEY");
+        let file = "./examples/config.yaml";
+        load(&file);
+    }
+
+    #[test]
+    #[serial]
+    fn load_config() {
+        let file = "./examples/config.yaml";
+        std::env::set_var("SENDGRID_API_KEY", "FAKE");
+        std::env::set_var("SENDGRID_MAIL_FROM", "notify@rfd-notify.org");
+        std::env::set_var("SENDGRID_MAIL_TO", "test@email.com");
+        load(&file);
     }
 }
 
-#[derive(Deserialize, Debug)]
+#[derive(Debug)]
 pub struct Config {
     pub expressions: Vec<String>,
-    pub sendgrid: Sendgrid,
+    pub sendgrid: SendgridConfig,
 }
 
-#[derive(Deserialize, Debug)]
-pub struct Sendgrid {
+#[derive(Debug, Deserialize, PartialEq)]
+pub struct ConfigFile {
+    pub expressions: Vec<String>,
+}
+
+#[derive(Envconfig, Debug)]
+pub struct SendgridConfig {
+    #[envconfig(from = "SENDGRID_MAIL_FROM")]
     pub mail_from: String,
+
+    #[envconfig(from = "SENDGRID_MAIL_TO")]
     pub mail_to: String,
+
+    #[envconfig(from = "SENDGRID_API_KEY")]
     pub api_key: String,
 }
 
-pub fn parse(filename: &str) -> Config {
+pub fn load(filename: &str) -> Config {
+    // Initialize expressions from file
     let contents = fs::read_to_string(filename)
         .unwrap_or_else(|e| panic!("Unable to read configuration file '{}'. {}", filename, e));
-    let config: Config = toml::from_str(&contents).unwrap_or_else(|e| {
-        panic!(
-            "Unable to parse configuration with contents: {}. {}",
-            contents, e
-        )
-    });
 
-    config
+    let config_file: ConfigFile = serde_yaml::from_str(&contents).unwrap();
+
+    // Initialize config from environment variables or terminate the process.
+    let sendgrid_config = SendgridConfig::init_from_env().unwrap();
+
+    Config {
+        expressions: config_file.expressions,
+        sendgrid: sendgrid_config,
+    }
 }

src/main.rs

@@ -39,7 +39,7 @@ fn main() {
     let matches = app.get_matches();
 
     let config = matches.value_of("config").unwrap();
-    let parsed_config = config::parse(config);
+    let parsed_config = config::load(config);
 
     info!("{:?}\n", parsed_config);
     let hot_deals = rfd::get_hot_deals().map_err(|err| error!("{:?}", err)).ok();