Add REST API for getting installation status

src/installer.rs

@@ -52,14 +52,22 @@ pub struct InstallerFramework {
     preexisting_install: bool
 }
 
+// Contains basic properties on the status of the session. Subset of InstallationFramework.
+#[derive(Serialize)]
+pub struct InstallationStatus {
+    database: Vec<LocalInstallation>,
+    install_path: Option<String>,
+    preexisting_install: bool
+}
+
 /// Used to track the amount of data that has been downloaded during a HTTP request.
 struct DownloadProgress {
     downloaded: usize,
 }
 
 /// Tracks the state of a local installation
-#[derive(Debug, Serialize, Deserialize)]
-struct LocalInstallation {
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct LocalInstallation {
     name: String,
     version: Version,
     files: Vec<String>,
@@ -398,6 +406,15 @@ impl InstallerFramework {
         self.install_path = Some(dir.to_owned());
     }
 
+    /// Returns metadata on the current status of the installation.
+    pub fn get_installation_status(&self) -> InstallationStatus {
+        InstallationStatus {
+            database: self.database.clone(),
+            install_path: self.install_path.clone(),
+            preexisting_install: self.preexisting_install
+        }
+    }
+
     /// Creates a new instance of the Installer Framework with a specified Config.
     pub fn new(config: Config) -> Self {
         InstallerFramework {

src/rest.rs

@@ -24,6 +24,7 @@ use std::net::{IpAddr, Ipv4Addr, SocketAddr};
 use std::thread::{self, JoinHandle};
 use std::process::exit;
 use std::sync::Arc;
+use std::sync::RwLock;
 use std::sync::mpsc::channel;
 use std::collections::HashMap;
 
@@ -31,13 +32,14 @@ use assets;
 
 use installer::InstallerFramework;
 use installer::InstallMessage;
-use std::sync::RwLock;
+use installer::LocalInstallation;
 
 #[derive(Serialize)]
 struct FileSelection {
     path: Option<String>,
 }
 
+
 /// Acts as a communication mechanism between the Hyper WebService and the rest of the
 /// application.
 pub struct WebServer {
@@ -152,6 +154,20 @@ impl Service for WebService {
             (&Get, "/api/exit") => {
                 exit(0);
             }
+            // Gets properties such as if the application is in maintenance mode
+            (&Get, "/api/installation-status") => {
+                let framework = self.framework.read().unwrap();
+
+                let response = framework.get_installation_status();
+
+                let file = serde_json::to_string(&response).unwrap();
+
+                Response::<hyper::Body>::new()
+                    .with_header(ContentLength(file.len() as u64))
+                    .with_header(ContentType::json())
+                    .with_body(file)
+            }
+            // Streams the installation of a particular set of packages
             (&Post, "/api/start-install") => {
                 // We need to bit of pipelining to get this to work
                 let framework = self.framework.clone();