Add communications between frontend<->backend for progress

src/http.rs

@@ -0,0 +1,3 @@
+/// http.rs
+///
+/// A simple wrapper around

src/installer.rs

@@ -10,8 +10,18 @@ use std::env::consts::OS;
 
 use std::path::PathBuf;
 
+use std::sync::mpsc::Sender;
+
 use config::Config;
 
+/// A message thrown during the installation of packages.
+#[derive(Serialize)]
+pub enum InstallMessage {
+    Status(String, f64),
+    Error(String),
+    EOF,
+}
+
 /// The installer framework contains metadata about packages, what is installable, what isn't,
 /// etc.
 pub struct InstallerFramework {
@@ -39,7 +49,11 @@ impl InstallerFramework {
     }
 
     /// Sends a request for something to be installed.
-    pub fn install(&self, items: Vec<String>) {
+    pub fn install(
+        &self,
+        items: Vec<String>,
+        messages: &Sender<InstallMessage>,
+    ) -> Result<(), String> {
         // TODO: Error handling
         println!("Framework: Installing {:?}", items);
 
@@ -55,20 +69,50 @@ impl InstallerFramework {
         println!("Resolved to {:?}", to_install);
 
         // Install packages
+        let mut count = 0.0 as f64;
+        let max = to_install.len() as f64;
+
         for package in to_install.iter() {
+            let base_package_percentage = count / max;
+            let base_package_range = ((count + 1.0) / max) - base_package_percentage;
+
             println!("Installing {}", package.name);
 
-            let results = package.source.get_current_releases().unwrap();
+            messages
+                .send(InstallMessage::Status(
+                    format!(
+                        "Polling {} for latest version of {}",
+                        package.source.name, package.name
+                    ),
+                    base_package_percentage + base_package_range * 0.25,
+                ))
+                .unwrap();
+
+            let results = package.source.get_current_releases()?;
+
+            messages
+                .send(InstallMessage::Status(
+                    format!("Resolving dependency for {}", package.name),
+                    base_package_percentage + base_package_range * 0.50,
+                ))
+                .unwrap();
 
             let filtered_regex = package.source.match_regex.replace("#PLATFORM#", OS);
-            let regex = Regex::new(&filtered_regex).unwrap();
+            let regex = match Regex::new(&filtered_regex) {
+                Ok(v) => v,
+                Err(v) => return Err(format!("An error occured while compiling regex: {:?}", v)),
+            };
 
             // Find the latest release in here
             let latest_result = results
                 .into_iter()
                 .filter(|f| f.files.iter().filter(|x| regex.is_match(&x.name)).count() > 0)
-                .max_by_key(|f| f.version.clone())
-                .unwrap();
+                .max_by_key(|f| f.version.clone());
+
+            let latest_result = match latest_result {
+                Some(v) => v,
+                None => return Err(format!("No release with correct file found")),
+            };
 
             // Find the matching file in here
             let latest_file = latest_result
@@ -79,7 +123,13 @@ impl InstallerFramework {
                 .unwrap();
 
             println!("{:?}", latest_file);
+
+            // TODO: Download found file
+
+            count += 1.0;
         }
+
+        Ok(())
     }
 
     /// Creates a new instance of the Installer Framework with a specified Config.

src/rest.rs

@@ -12,6 +12,7 @@ use serde_json;
 use futures::Stream;
 use futures::Future;
 use futures::future;
+use futures::Sink;
 
 use hyper::{self, Error as HyperError, Get, Post, StatusCode};
 use hyper::header::{ContentLength, ContentType};
@@ -29,6 +30,7 @@ use std::collections::HashMap;
 use assets;
 
 use installer::InstallerFramework;
+use installer::InstallMessage;
 
 #[derive(Serialize)]
 struct FileSelection {
@@ -164,17 +166,39 @@ impl Service for WebService {
                         }
                     }
 
+                    let (sender, receiver) = channel();
+                    let (tx, rx) = hyper::Body::pair();
+
                     // Startup a thread to do this operation for us
                     thread::spawn(move || {
-                        cloned_element.install(to_install);
+                        match cloned_element.install(to_install, &sender) {
+                            Err(v) => sender.send(InstallMessage::Error(v)).unwrap(),
+                            _ => {}
+                        }
+                        sender.send(InstallMessage::EOF).unwrap();
                     });
 
-                    let file = serde_json::to_string(&{}).unwrap();
+                    // Spawn a thread for transforming messages to chunk messages
+                    thread::spawn(move || {
+                        let mut tx = tx;
+                        loop {
+                            let response = receiver.recv().unwrap();
+
+                            match &response {
+                                &InstallMessage::EOF => break,
+                                _ => {}
+                            }
+
+                            let mut response = serde_json::to_string(&response).unwrap();
+                            response.push('\n');
+                            tx = tx.send(Ok(response.into_bytes().into())).wait().unwrap();
+                        }
+                    });
 
                     Response::<hyper::Body>::new()
-                        .with_header(ContentLength(file.len() as u64))
-                        .with_header(ContentType::json())
-                        .with_body(file)
+                        //.with_header(ContentLength(file.len() as u64))
+                        .with_header(ContentType::plaintext())
+                        .with_body(rx)
                 }));
             }
 

src/sources/types.rs

@@ -66,6 +66,8 @@ pub struct File {
     pub url: String,
 }
 
+impl File {}
+
 /// A individual release of an application.
 #[derive(Debug)]
 pub struct Release {

static/index.html

@@ -74,6 +74,7 @@
                         <div v-html="config.general.installing_message"></div>
                         <br />
 
+                        <div v-html="progress_message"></div>
                         <progress class="progress is-info is-medium" v-bind:value="progress" max="100">
                             {{ progress }}%
                         </progress>
@@ -106,7 +107,8 @@
                 select_packages : true,
                 is_installing : false,
                 is_finished : false,
-                progress : 0
+                progress : 0,
+                progress_message : ""
             },
             methods: {
                 "select_file": function() {
@@ -132,15 +134,15 @@
                     }
                     console.log(results);
 
-                    ajax("/api/start-install", function(e) {
-                        // TODO: Remove fake loading
-                        setInterval(function() {
-                            app.progress += 5;
-                            if (app.progress >= 100) {
-                                app.is_installing = false;
-                                app.is_finished = true;
-                            }
-                        }, 100);
+                    stream_ajax("/api/start-install", function(line) {
+                        console.log(line);
+                        if (line.hasOwnProperty("Status")) {
+                            app.progress_message = line.Status[0];
+                            app.progress = line.Status[1] * 100;
+                        }
+                    }, function(e) {
+                        app.is_installing = false;
+                        app.is_finished = true;
                     }, undefined, results);
                 },
                 "exit": function() {

static/js/helpers.js

@@ -51,6 +51,69 @@ function ajax(path, successCallback, failCallback, data) {
     }
 }
 
+/**
+ * Makes a AJAX request, streaming each line as it arrives. Type should be text/plain,
+ * each line will be interpeted as JSON seperately.
+ *
+ * @param path The path to connect to.
+ * @param callback A callback with a JSON payload. Called for every line as it comes.
+ * @param successCallback A callback with a raw text payload.
+ * @param failCallback A fail callback. Optional.
+ * @param data POST data. Optional.
+ */
+function stream_ajax(path, callback, successCallback, failCallback, data) {
+    var req = new XMLHttpRequest();
+
+    req.addEventListener("load", function() {
+        // The server can sometimes return a string error. Make sure we handle this.
+        if (this.status === 200) {
+            successCallback(this.responseText);
+        } else {
+            failCallback();
+        }
+    });
+
+    req.onreadystatechange = function() {
+        if(req.readyState > 2) {
+            var newData = req.responseText.substr(req.seenBytes);
+
+            var lines = newData.split("\n");
+            for (var i = 0; i < lines.length; i++) {
+                var line = lines[i].trim();
+                if (line.length === 0) {
+                    continue;
+                }
+
+                var contents = JSON.parse(line);
+                callback(contents);
+            }
+
+            req.seenBytes = req.responseText.length;
+        }
+    };
+
+    req.addEventListener("error", failCallback);
+
+    req.open(data == null ? "GET" : "POST", path + "?nocache=" + request_id++, true);
+    // Rocket only currently supports URL encoded forms.
+    req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
+
+    if (data != null) {
+        var form = "";
+
+        for (var key in data) {
+            if (form !== "") {
+                form += "&";
+            }
+            form += encodeURIComponent(key) + "=" + encodeURIComponent(data[key]);
+        }
+
+        req.send(form);
+    } else {
+        req.send();
+    }
+}
+
 /**
  * The default handler if a AJAX request fails. Not to be used directly.
  *