Make machine correctly load state and set previous/current use in API

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "diflouroborane"
-version = "0.3.0"
+version = "0.3.1"
 authors = [ "dequbed <me@dequbed.space>"
           , "Kai Jan Kriegel <kai@kjkriegel.de>"
           , "Joseph Langosch <thejoklla@gmail.com>"

src/api/machine.rs

@@ -65,13 +65,52 @@ impl info::Server for Machine {
         _: info::GetMachineInfoExtendedParams,
         mut results: info::GetMachineInfoExtendedResults,
     ) -> Promise<(), capnp::Error> {
-        if self.perms.manage {
+        let machine = self.machine.get_inner();
+        let perms = self.perms.clone();
+        let f = async move {
+            if perms.manage {
                 let mut builder = results.get();
                 let mut extinfo = builder.init_machine_info_extended();
-            let mut current = extinfo.init_current_user();
-            current.set_username(&self.userid.uid);
+                let guard = machine.lock().await;
+
+                // "previous" user
+                if let Some(user) = guard.get_previous() {
+                    let mut previous = extinfo.reborrow().init_transfer_user();
+                    previous.set_username(&user.uid);
                 }
-        Promise::ok(())
+
+                let state = guard.read_state();
+                let state_lock = state.lock_ref();
+                match state_lock.state {
+                    Status::Free => {}
+                    Status::InUse(ref user) => if user.is_some() {
+                        let user = user.as_ref().unwrap();
+                        let mut current = extinfo.init_current_user();
+                        current.set_username(&user.uid);
+                    }
+                    Status::ToCheck(ref user) => {
+                        let mut current = extinfo.init_current_user();
+                        current.set_username(&user.uid);
+                    }
+                    Status::Blocked(ref user) => {
+                        let mut current = extinfo.init_current_user();
+                        current.set_username(&user.uid);
+                    }
+                    Status::Disabled => {}
+                    Status::Reserved(ref user) => {
+                        let mut current = extinfo.init_current_user();
+                        current.set_username(&user.uid);
+                    }
+                }
+            }
+
+            Ok(())
+        };
+
+        let g = smol::future::race(f, smol::Timer::after(Duration::from_secs(4))
+            .map(|_| Err(capnp::Error::failed("Waiting for machine lock timed out!".to_string()))));
+
+        Promise::from_future(g)
     }
 
     fn get_reservation_list(

src/db.rs

@@ -24,10 +24,12 @@ pub mod access;
 /// Stores&Retrieves Machines
 pub mod machine;
 
+pub type MachineDB = machine::internal::Internal;
+
 #[derive(Clone)]
 pub struct Databases {
     pub access: Arc<access::AccessControl>,
-    pub machine: Arc<machine::internal::Internal>,
+    pub machine: Arc<MachineDB>,
     pub userdb: Arc<user::Internal>,
 }
 

src/db/machine.rs

@@ -75,7 +75,7 @@ impl MachineState {
 
 pub fn init(log: Logger, _config: &Config, env: Arc<lmdb::Environment>) -> Result<Internal> {
     let mut flags = lmdb::DatabaseFlags::empty();
-    flags.set(lmdb::DatabaseFlags::INTEGER_KEY, true);
+    //flags.set(lmdb::DatabaseFlags::INTEGER_KEY, true);
     let machdb = env.create_db(Some("machines"), flags)?;
     debug!(&log, "Opened machine db successfully.");
 

src/db/machine/internal.rs

@@ -2,7 +2,7 @@ use std::sync::Arc;
 
 use slog::Logger;
 
-use lmdb::{Environment, Transaction, RwTransaction, Cursor};
+use lmdb::{Environment, Transaction, RwTransaction, Cursor, RoTransaction};
 
 use super::{MachineIdentifier, MachineState};
 use crate::error::Result;
@@ -37,11 +37,11 @@ impl Internal {
         self.get_with_txn(&txn, id)
     }
 
-    pub fn put_with_txn(&self, txn: &mut RwTransaction, uuid: &String, status: &MachineState) 
+    pub fn put_with_txn(&self, txn: &mut RwTransaction, id: &String, status: &MachineState)
         -> Result<()>
     {
         let bytes = flexbuffers::to_vec(status)?;
-        txn.put(self.db, &uuid.as_bytes(), &bytes, lmdb::WriteFlags::empty())?;
+        txn.put(self.db, &id.as_bytes(), &bytes, lmdb::WriteFlags::empty())?;
 
         Ok(())
     }
@@ -52,11 +52,20 @@ impl Internal {
         txn.commit().map_err(Into::into)
     }
 
-    pub fn iter<T: Transaction>(&self, txn: &T) -> Result<impl Iterator<Item=MachineState>> {
+    pub fn iter<'txn, T: Transaction>(&self, txn: &'txn T)
+        -> Result<impl Iterator<Item=(&'txn str, MachineState)>>
+    {
        let mut cursor = txn.open_ro_cursor(self.db)?;
        Ok(cursor.iter_start().map(|buf| {
-           let (_kbuf, vbuf) = buf.unwrap();
-           flexbuffers::from_slice(vbuf).unwrap()
+           let (kbuf, vbuf) = buf.unwrap();
+           let id = unsafe { std::str::from_utf8_unchecked(kbuf) };
+           let state = flexbuffers::from_slice(vbuf).unwrap();
+           (id, state)
        }))
     }
+
+    pub fn txn(&self) -> Result<RoTransaction> {
+        let txn = self.env.begin_ro_txn()?;
+        Ok(txn)
+    }
 }

src/machine.rs

@@ -19,12 +19,13 @@ use futures::channel::{mpsc, oneshot};
 use futures_signals::signal::Signal;
 use futures_signals::signal::SignalExt;
 use futures_signals::signal::{Mutable, ReadOnlyMutable};
+use slog::Logger;
 
 use crate::error::{Result, Error};
 
-use crate::db::access;
+use crate::db::{access, Databases, MachineDB};
 use crate::db::machine::{MachineIdentifier, MachineState, Status};
-use crate::db::user::{User, UserData};
+use crate::db::user::{User, UserData, UserId};
 
 use crate::network::MachineMap;
 use crate::space;
@@ -73,13 +74,14 @@ impl Machine {
         }
     }
 
-    pub fn construct
-        ( id: MachineIdentifier
-        , desc: MachineDescription
-        , state: MachineState
+    pub fn construct(
+        id: MachineIdentifier,
+        desc: MachineDescription,
+        state: MachineState,
+        db: Arc<MachineDB>,
     ) -> Machine
     {
-        Self::new(Inner::new(id, state), desc)
+        Self::new(Inner::new(id, state, db), desc)
     }
 
     pub fn do_state_change(&self, new_state: MachineState) 
@@ -136,17 +138,20 @@ pub struct Inner {
     /// case of an actor it should then make sure that the real world matches up with the set state
     state: Mutable<MachineState>,
     reset: Option<MachineState>,
+
+    previous: Option<UserId>,
+
+    db: Arc<MachineDB>,
 }
 
 impl Inner {
-    pub fn new ( id: MachineIdentifier
-               , state: MachineState
-               ) -> Inner 
-    {
+    pub fn new(id: MachineIdentifier, state: MachineState, db: Arc<MachineDB>) -> Inner {
         Inner {
             id,
             state: Mutable::new(state),
             reset: None,
+            previous: None,
+            db,
         }
     }
 
@@ -162,8 +167,13 @@ impl Inner {
         Box::pin(self.state.signal_cloned().dedupe_cloned())
     }
 
+    fn replace_state(&mut self, new_state: MachineState) -> MachineState {
+        self.db.put(&self.id, &new_state);
+        self.state.replace(new_state)
+    }
+
     pub fn do_state_change(&mut self, new_state: MachineState) {
-            let old_state = self.state.replace(new_state);
+            let old_state = self.replace_state(new_state);
             self.reset.replace(old_state);
     }
 
@@ -176,9 +186,30 @@ impl Inner {
     }
 
     pub fn reset_state(&mut self) {
-        if let Some(state) = self.reset.take() {
-            self.state.replace(state);
+        let previous_state = self.read_state();
+        let state_lock = previous_state.lock_ref();
+        // Only update previous user if state changed from InUse or ToCheck to whatever.
+        match state_lock.state {
+            Status::InUse(ref user) => {
+                self.previous = user.clone();
+            },
+            Status::ToCheck(ref user) => {
+                self.previous = Some(user.clone());
+            },
+            _ => {},
         }
+        drop(state_lock);
+
+        if let Some(state) = self.reset.take() {
+            self.replace_state(state);
+        } else {
+            // Default to Free
+            self.replace_state(MachineState::free());
+        }
+    }
+
+    pub fn get_previous(&self) -> &Option<UserId> {
+        &self.previous
     }
 }
 
@@ -242,15 +273,22 @@ impl MachineDescription {
     }
 }
 
-pub fn load(config: &crate::config::Config)
+pub fn load(config: &crate::config::Config, db: Databases, log: &Logger)
     -> Result<MachineMap> 
 {
     let mut map = config.machines.clone();
+    let db = db.machine;
 
     let it = map.drain()
         .map(|(k,v)| {
             // TODO: Read state from the state db
-            (v.name.clone(), Machine::construct(k, v, MachineState::new()))
+            if let Some(state) = db.get(&k).unwrap() {
+                debug!(log, "Loading old state from db for {}: {:?}", &k, &state);
+                (v.name.clone(), Machine::construct(k, v, state, db.clone()))
+            } else {
+                debug!(log, "No old state found in db for {}, creating new.", &k);
+                (v.name.clone(), Machine::construct(k, v, MachineState::new(), db.clone()))
+            }
         });
 
 

src/main.rs

@@ -167,7 +167,16 @@ fn maybe(matches: clap::ArgMatches, log: Arc<Logger>) -> Result<(), Error> {
         let ex = Executor::new();
         let db = db::Databases::new(&log, &config)?;
 
-        let machines = machine::load(&config)?;
+        {
+            info!(log, "Loaded DB state:");
+            let txn = db.machine.txn()?;
+            for (id, state) in db.machine.iter(&txn)? {
+                info!(log, "- {}: {:?}", id, state);
+            }
+            info!(log, "Loaded DB state END.");
+        }
+
+        let machines = machine::load(&config, db.clone(), &log)?;
         let (actor_map, actors) = actor::load(&log, &config)?;
         let (init_map, initiators) = initiator::load(&log, &config)?;