rewrite hostname_stream to use dbus

src/config.rs

@@ -1,5 +1,6 @@
 use crate::tile::Block;
 use crate::tiles;
+use dbus::nonblock::SyncConnection;
 use futures::{stream::BoxStream, Stream};
 use serde::{Deserialize, Deserializer};
 use smart_default::SmartDefault;
@@ -7,6 +8,7 @@ use std::env::var;
 use std::error::Error;
 use std::io;
 use std::path::PathBuf;
+use std::sync::Arc;
 use structopt::StructOpt;
 use tokio::fs::File;
 use tokio::prelude::*;
@@ -113,11 +115,12 @@ pub async fn read_config() -> Result<Config, Box<dyn std::error::Error>> {
 
 pub fn process_tile(
     tile: &TileConfig,
+    connection: &Arc<SyncConnection>,
 ) -> BoxStream<'static, Result<Block, Box<dyn std::error::Error + Send + Sync>>> {
     let five_secs = Duration::from_secs(5);
     match &tile.config_type {
         TileConfigType::Battery => wrap(tiles::battery_stream(), tile.update.or(Some(five_secs))),
-        TileConfigType::Hostname => wrap(tiles::hostname_stream(), tile.update),
+        TileConfigType::Hostname => wrap(tiles::hostname_stream(connection.clone()), tile.update),
         TileConfigType::Load => wrap(tiles::load_stream(), tile.update.or(Some(five_secs))),
         TileConfigType::Memory => wrap(tiles::memory_stream(), tile.update.or(Some(five_secs))),
         TileConfigType::Time(c) => wrap(tiles::time_stream(c.clone()), tile.update),

src/main.rs

@@ -4,7 +4,7 @@ mod output;
 mod tile;
 mod tiles;
 
-use dbus_tokio::connection::new_session_sync;
+use dbus_tokio::connection::new_system_sync;
 use futures::channel::mpsc::{channel, Sender};
 use futures::{stream::BoxStream, StreamExt};
 use std::fmt::Debug;
@@ -16,7 +16,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let config = config::read_config().await?;
 
     // We can't do much until we have a D-Bus connection so just do it synchronously
-    let (resource, _conn) = new_session_sync()?;
+    let (resource, conn) = new_system_sync()?;
 
     // Now start listening on our D-Bus connection
     tokio::spawn(async {
@@ -29,7 +29,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let tiles: Vec<_> = config
         .tile
         .iter()
-        .map(config::process_tile)
+        .map(|tile| config::process_tile(tile, &conn))
         .enumerate()
         .map(|(index, stream)| spawn_stream(index, stream, sender.clone()))
         .collect();

src/tiles/hostname.rs

@@ -1,22 +1,28 @@
 use crate::tile::Block;
-use futures::stream;
-use futures::Stream;
-use tokio::fs::File;
-use tokio::prelude::*;
+use dbus::nonblock::stdintf::org_freedesktop_dbus::Properties;
+use dbus::nonblock::{Proxy, SyncConnection};
+use futures::{FutureExt, Stream};
+use std::sync::Arc;
+use std::time::Duration;
 
 pub fn hostname_stream(
+    connection: Arc<SyncConnection>,
 ) -> impl Stream<Item = Result<Block, Box<dyn std::error::Error + Send + Sync>>> {
-    stream::once(async {
-        let mut raw = String::new();
-        File::open("/proc/sys/kernel/hostname")
-            .await?
-            .read_to_string(&mut raw)
-            .await?;
+    let proxy = Proxy::new(
+        "org.freedesktop.hostname1",
+        "/org/freedesktop/hostname1",
+        Duration::from_secs(5),
+        connection,
+    );
+    let reply = proxy.get("org.freedesktop.hostname1", "Hostname");
+    async {
+        let hostname: String = reply.await?;
         let block = Block {
-            full_text: raw.trim_end_matches('\n').into(),
+            full_text: hostname.into(),
             name: "hostname".into(),
             ..Default::default()
         };
         Ok(block)
-    })
+    }
+    .into_stream()
 }