Begin service work...

.editorconfig

@@ -1,3 +1,4 @@
 [*.rs]
 indent_style = space
 indent_size = 2
+max_line_length = 80

Justfile

@@ -1,11 +1,17 @@
+set dotenv-load := false
+
 ct:
     tokei
 
 fmt:
     cargo +nightly fmt --all
 
-doc:
-    cargo doc --workspace --no-deps
+doc shouldOpen="":
+    #!/bin/bash
+    if [[ -n "{{shouldOpen}}" ]]; then
+        OPEN=--open
+    fi
+    cargo doc --workspace --document-private-items --no-deps $OPEN
 
 test:
     cargo test --all

daemon/src/config/mod.rs

@@ -1,3 +1,5 @@
+//! Everything related to config handling within the panorama daemon.
+
 #[cfg(feature = "config-watch")]
 mod watcher;
 

daemon/src/exit.rs

@@ -0,0 +1,15 @@
+use tokio::sync::oneshot;
+
+/// Receiver whose sole purpose is to receive an "exit" notification.
+///
+/// This exit "pattern", along with message passing over channels, allows
+/// panorama to introspect on running loops. For example, a server listen loop
+/// would select over the `ExitListener`, and break the loop once it receives
+/// something on that channel. Then it would perform any clean up it needs and
+/// exit, returning any resources that can be reused.
+///
+/// This is useful, for example, during TLS upgrade with STARTTLS, where the
+/// connection needs to stay open. We can send the existing loop an "exit"
+/// notification, then it returns the open channel so we can perform TLS
+/// negotiation and create a new tunneled connection.
+pub type ExitListener = oneshot::Receiver<()>;

daemon/src/lib.rs

@@ -1,3 +1,7 @@
+//! Library functions used by the panorama daemon.
+
+// #![deny(missing_docs)]
+
 #[macro_use]
 extern crate serde;
 #[macro_use]
@@ -12,6 +16,9 @@ extern crate derivative;
 pub mod config;
 pub mod mail;
 
+mod exit;
+mod service;
+
 use std::path::PathBuf;
 
 use anyhow::{Context, Result};
@@ -24,10 +31,9 @@ use tokio::{
 use xdg::BaseDirectories;
 
 use crate::config::{Config, MailAccountConfig};
+pub use crate::exit::ExitListener;
 use crate::mail::{mail_main, MailStore};
 
-type ExitListener = oneshot::Receiver<()>;
-
 /// The panorama daemon runs in the background and communicates with other
 /// panorama components over Unix sockets.
 #[derive(Debug, Parser)]
@@ -41,6 +47,11 @@ struct Options {
   verbose: usize,
 }
 
+/// Primary entrypoint; this is the function that is called by main with no
+/// arguments.
+///
+/// The purpose of this function is to parse command line arguments
+/// and set up config watching, then call [`run_with_config`] with the config.
 pub async fn run() -> Result<()> {
   let opt = Options::parse();
 
@@ -118,8 +129,8 @@ async fn run_with_config(config: Config, exit: ExitListener) -> Result<()> {
 
 /// The main loop for a single mail account.
 ///
-/// This loop is restarted each time the config watcher gets a new config, at
-/// which point `exit` is sent a single value telling us to break the loop.
+/// The exit listener may allow the loop to be interrupted by the outside. When
+/// anything is received on the exit listener, the loop exits gracefully.
 async fn run_single_mail_account(
   account_name: String,
   account: MailAccountConfig,

daemon/src/mail/mod.rs

@@ -6,7 +6,7 @@ mod store;
 use anyhow::{Context, Result};
 use futures::stream::StreamExt;
 use panorama_imap::{
-  client::{auth::Login, ConfigBuilder},
+  client::{ClientAuthenticated, ConfigBuilder},
   pool::{ImapPool, PoolConfig},
   proto::{
     command::FetchItems,
@@ -16,14 +16,18 @@ use panorama_imap::{
 use sqlx::migrate::Migrator;
 use tokio::sync::mpsc::UnboundedSender;
 
-use crate::config::{ImapAuth, MailAccountConfig, TlsMethod};
+use crate::config::{MailAccountConfig, TlsMethod};
 
 pub use self::event::MailEvent;
 pub use self::store::MailStore;
 
 static MIGRATOR: Migrator = sqlx::migrate!();
 
-/// The main function for the IMAP syncing thread
+/// The main function for the IMAP thread.
+///
+/// This spawns two processes:
+/// - A background synchronization thread
+/// - An event listener / handler
 pub async fn mail_main(
   acct_name: impl AsRef<str>,
   acct: MailAccountConfig,
@@ -50,51 +54,21 @@ pub async fn mail_main(
   // grab one connection from that pool and start running a background
   // synchronization thread
   let sync_conn = pool.acquire().await?;
+  let sync_loop = run_sync_loop(sync_conn);
 
   // let the rest of the pool respond to requests coming from the channel
   // TODO:
 
-  return Ok(());
+  sync_loop.await?;
 
-  // loop ensures that the connection is retried after it dies
-  loop {
-    let client = ConfigBuilder::default()
-      .hostname(acct.imap.server.clone())
-      .port(acct.imap.port)
-      .tls(matches!(acct.imap.tls, TlsMethod::On))
-      .open()
-      .await
-      .map_err(|err| anyhow!("err: {}", err))?;
-    debug!("Connected to {}:{}.", &acct.imap.server, acct.imap.port);
+  Ok(())
+}
 
-    debug!("TLS Upgrade option: {:?}", acct.imap.tls);
-    let unauth = if matches!(acct.imap.tls, TlsMethod::Starttls) {
-      debug!("attempting to upgrade");
-      let client = client
-        .upgrade()
-        .await
-        .context("could not upgrade connection")?;
-      debug!("upgrade successful");
-      client
-    } else {
-      warn!("Continuing with unencrypted connection!");
-      client
-    };
+async fn run_sync_loop(mut conn: ClientAuthenticated) -> Result<()> {
+  // get the list of folders first
+  debug!(target: "run_sync_loop", "Retrieving folder list...");
+  let folder_list = conn.list().await?;
 
-    debug!("preparing to auth");
-    // check if the authentication method is supported
-    let mut authed = match &acct.imap.auth {
-      ImapAuth::Plain { username, password } => {
-        let login = Login {
-          username: username.clone(),
-          password: password.clone(),
-        };
-        unauth.auth(login).await?
-      }
-    };
-
-    debug!("authentication successful!");
-    let folder_list = authed.list().await?;
   // let _ = mail2ui_tx.send(MailEvent::FolderList(
   //     acct_name.clone(),
   //     folder_list.clone(),
@@ -103,7 +77,7 @@ pub async fn mail_main(
   debug!("mailbox list: {:?}", folder_list);
   for folder in folder_list.iter() {
     debug!("folder: {:?}", folder);
-      let select = authed.select("INBOX").await?;
+    let select = conn.select("INBOX").await?;
     debug!("select response: {:?}", select);
     if let (Some(_exists), Some(_uidvalidity)) =
       (select.exists, select.uid_validity)
@@ -124,7 +98,7 @@ pub async fn mail_main(
       // <Vec<_>>().await?;
       if !new_uids.is_empty() {
         debug!("fetching uids {:?}", new_uids);
-          let _fetched = authed
+        let _fetched = conn
           .uid_fetch(&new_uids, &[], FetchItems::Envelope)
           .await
           .context("error fetching uids")?;
@@ -147,18 +121,18 @@ pub async fn mail_main(
   // mailbox later?
 
   debug!("selecting the INBOX mailbox");
-    let select = authed.select("INBOX").await?;
+  let select = conn.select("INBOX").await?;
   debug!("select result: {:?}", select);
 
   loop {
-      let message_uids = authed.uid_search().await?;
+    let message_uids = conn.uid_search().await?;
     let message_uids = message_uids.into_iter().take(30).collect::<Vec<_>>();
     // let _ = mail2ui_tx.send(MailEvent::MessageUids(
     //     acct_name.clone(),
     //     message_uids.clone(),
     // ));
     // TODO: make this happen concurrently with the main loop?
-      let mut message_list = authed
+    let mut message_list = conn
       .uid_fetch(&message_uids, &[], FetchItems::All)
       .await
       .unwrap();
@@ -172,7 +146,7 @@ pub async fn mail_main(
     let supports_idle = true; // authed.has_capability("IDLE").await?;
 
     if supports_idle {
-        let mut idle_stream = authed.idle().await?;
+      let mut idle_stream = conn.idle().await?;
       loop {
         let evt = match idle_stream.next().await {
           Some(v) => v,
@@ -191,7 +165,7 @@ pub async fn mail_main(
             //     .icon("firefox")
             //     .timeout(Timeout::Milliseconds(6000))
             //     .show()?;
-              let message_uids = authed.uid_search().await?;
+            let message_uids = conn.uid_search().await?;
             let message_uids =
               message_uids.into_iter().take(20).collect::<Vec<_>>();
             // let _ = mail2ui_tx.send(MailEvent::MessageUids(
@@ -200,7 +174,7 @@ pub async fn mail_main(
             // ));
             // TODO: make this happen concurrently with the main
             // loop?
-              let mut message_list = authed
+            let mut message_list = conn
               .uid_fetch(&message_uids, &[], FetchItems::All)
               .await
               .unwrap();
@@ -211,7 +185,7 @@ pub async fn mail_main(
               // mail2ui_tx.send(evt);
             }
 
-              idle_stream = authed.idle().await?;
+            idle_stream = conn.idle().await?;
           }
           _ => {}
         }
@@ -233,5 +207,6 @@ pub async fn mail_main(
   // TODO: some kind of smart exponential backoff that considers some time
   // threshold to be a failing case?
   tokio::time::sleep(std::time::Duration::from_secs(5)).await;
-  }
+
+  Ok(())
 }

daemon/src/service.rs

@@ -0,0 +1,4 @@
+pub trait Service<Request> {
+  type Response;
+  type Error;
+}