Stuff

src/db/access.rs

@@ -49,6 +49,21 @@ impl AccessControl {
         }
     }
 
+    pub fn check<P: AsRef<Permission>>(&self, user: &UserData, perm: P) -> Result<bool> {
+        let mut roles = HashMap::new();
+        // Check all user roles by..
+        Ok(user.roles.iter().any(|role| {
+            // 1. Getting the whole tree down to a list of Roles applied
+            self.internal.tally_role(&mut roles, role)?;
+
+            // 2. Checking if any of the roles the user has give any permission granting the
+            //    requested one.
+            roles.drain().any(|(rid, role)| {
+                role.permissions.iter().any(|rule| rule.match_perm(perm))
+            })
+        }))
+    }
+
     pub fn collect_permrules(&self, user: &UserData) -> Result<Vec<PermRule>> {
         self.internal.collect_permrules(user)
     }

src/initiator.rs

@@ -1,3 +1,4 @@
+use std::sync::Arc;
 use std::pin::Pin;
 use std::task::{Poll, Context};
 use std::future::Future;
@@ -7,14 +8,13 @@ use smol::Timer;
 
 use slog::Logger;
 
-use paho_mqtt::AsyncClient;
-
 use futures::future::BoxFuture;
 
 use futures_signals::signal::{Signal, Mutable, MutableSignalCloned};
 use crate::machine::{Machine, ReturnToken};
 use crate::db::machine::MachineState;
-use crate::db::user::{User, UserId, UserData};
+use crate::db::user::{User, UserId, UserData, Internal as UserDB};
+use crate::db::access::AccessControl;
 
 use crate::network::InitMap;
 
@@ -22,7 +22,7 @@ use crate::error::Result;
 use crate::config::Config;
 
 pub trait Sensor {
-    fn run_sensor(&mut self) -> BoxFuture<'static, (Option<User>, MachineState)>;
+    fn run_sensor(&mut self) -> BoxFuture<'static, (Option<UserId>, MachineState)>;
 }
 
 type BoxSensor = Box<dyn Sensor + Send>;
@@ -36,10 +36,13 @@ pub struct Initiator {
     state_change_fut: Option<BoxFuture<'static, Result<ReturnToken>>>,
     token: Option<ReturnToken>,
     sensor: BoxSensor,
+
+    userdb: UserDB,
+    access: AccessControl,
 }
 
 impl Initiator {
-    pub fn new(log: Logger, sensor: BoxSensor, signal: MutableSignalCloned<Option<Machine>>) -> Self {
+    pub fn new(log: Logger, sensor: BoxSensor, signal: MutableSignalCloned<Option<Machine>>, userdb: UserDB, access: AccessControl) -> Self {
         Self {
             log: log,
             signal: signal,
@@ -48,14 +51,16 @@ impl Initiator {
             state_change_fut: None,
             token: None,
             sensor: sensor,
+            userdb,
+            access,
         }
     }
 
-    pub fn wrap(log: Logger, sensor: BoxSensor) -> (Mutable<Option<Machine>>, Self) {
+    pub fn wrap(log: Logger, sensor: BoxSensor, userdb: UserDB, access: Arc<AccessControl>) -> (Mutable<Option<Machine>>, Self) {
         let m = Mutable::new(None);
         let s = m.signal_cloned();
 
-        (m, Self::new(log, sensor, s))
+        (m, Self::new(log, sensor, s, userdb, access))
     }
 }
 
@@ -113,12 +118,11 @@ impl Future for Initiator {
                 None => {
                     this.future = Some(this.sensor.run_sensor());
                 },
-                Some(Poll::Ready((user, state))) => {
+                Some(Poll::Ready((uid, state))) => {
                     debug!(this.log, "Sensor returned a new state");
                     this.future.take();
                     let f = this.machine.as_mut().map(|machine| {
-                        unimplemented!()
-                        //machine.request_state_change(user.as_ref(), state)
+                        machine.request_state_change(state, this.access.clone(), user)
                     });
                     this.state_change_fut = f;
                 }
@@ -128,7 +132,7 @@ impl Future for Initiator {
     }
 }
 
-pub fn load(log: &Logger, config: &Config) -> Result<(InitMap, Vec<Initiator>)> {
+pub fn load(log: &Logger, config: &Config, userdb: UserDB, access: Arc<AccessControl>) -> Result<(InitMap, Vec<Initiator>)> {
     let mut map = HashMap::new();
 
     let initiators = config.initiators.iter()
@@ -140,7 +144,7 @@ pub fn load(log: &Logger, config: &Config) -> Result<(InitMap, Vec<Initiator>)>
 
     let mut v = Vec::new();
     for (name, initiator) in initiators {
-        let (m, i) = Initiator::wrap(log.new(o!("name" => name.clone())), initiator);
+        let (m, i) = Initiator::wrap(log.new(o!("name" => name.clone())), initiator, userdb.clone(), access.clone());
         map.insert(name.clone(), m);
         v.push(i);
     }
@@ -180,7 +184,7 @@ impl Dummy {
 
 impl Sensor for Dummy {
     fn run_sensor(&mut self)
-        -> BoxFuture<'static, (Option<User>, MachineState)>
+        -> BoxFuture<'static, (Option<UserId>, MachineState)>
     {
         let step = self.step;
         self.step = !step;
@@ -192,12 +196,8 @@ impl Sensor for Dummy {
             if step {
                 return (None, MachineState::free());
             } else {
-                let user = User::new(
-                    UserId::new("test".to_string(), None, None),
-                    UserData::new(vec![crate::db::access::RoleIdentifier::local_from_str("lmdb".to_string(), "testrole".to_string())], 0),
-                );
-                let id = user.id.clone();
-                return (Some(user), MachineState::used(Some(id)));
+                let user = UserId::new("test".to_string(), None, None);
+                return (Some(user), MachineState::used(Some(user)));
             }
         };
 

src/machine.rs

@@ -22,9 +22,9 @@ use futures_signals::signal::{Mutable, ReadOnlyMutable};
 
 use crate::error::{Result, Error};
 
-use crate::db::access;
+use crate::db::access::{AccessControl, PrivilegesBuf, PermissionBuf};
 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;
@@ -82,6 +82,52 @@ impl Machine {
         Self::new(Inner::new(id, state), desc)
     }
 
+    fn match_perm(&self, status: &Status) -> Option<&PermissionBuf> {
+        let p = self.desc.privs;
+        match status {
+            // If you were allowed to use it you're allowed to give it back
+            Status::Free 
+            | Status::ToCheck(_)
+                => None,
+
+            Status::Blocked(_) 
+            | Status::Disabled 
+            | Status::Reserved(_) 
+                => Some(&p.manage),
+
+            Status::InUse(_) => Some(&p.write),
+        }
+    }
+
+    pub fn request_state_change(&self, new_state: MachineState, access: AccessControl, user: &User)
+        -> BoxFuture<'static, Result<()>>
+    {
+        let this = self.clone();
+        let perm = self.match_perm(&new_state.state);
+        let grant = perm.map(|p| access.check(&user.data, p).unwrap_or(false));
+
+        let uid = user.id.clone();
+        // is it a return
+        let is_ret = new_state.state == Status::Free;
+        // is it a (normal) write /the user is allowed to do/?
+        let is_wri = new_state.state == Status::InUse(Some(uid))
+                     && access.check(&user.data, self.desc.privs.write).unwrap_or(false);
+
+        let f = async move {
+            let mut guard = this.inner.lock().await;
+            // either e.g. InUse(<myself>) => Free or I'm allowed to overwrite
+            if (is_ret && guard.is_self(uid))
+            || (is_wri && guard.is_free())
+            || grant.unwrap_or(false)
+            {
+                guard.do_state_change(new_state);
+            }
+            return Ok(())
+        };
+
+        Box::pin(f)
+    }
+
     pub fn do_state_change(&self, new_state: MachineState) 
         -> BoxFuture<'static, Result<()>>
     {
@@ -126,6 +172,10 @@ impl Deref for Machine {
 /// A machine connects an event from a sensor to an actor activating/deactivating a real-world
 /// machine, checking that the user who wants the machine (de)activated has the required
 /// permissions.
+///
+/// Machines have a rather complex state machine since they have to be eventually consistent and
+/// can fail at any point in time (e.g. because power cuts out suddenly, a different task on this
+/// thread panics, some loaded code produces a segfault, ...)
 pub struct Inner {
     /// Globally unique machine readable identifier
     pub id: MachineIdentifier,
@@ -180,6 +230,20 @@ impl Inner {
             self.state.replace(state);
         }
     }
+
+    pub fn is_self(&mut self, uid: UserId) -> bool {
+        match self.read_state().get_cloned().state {
+            Status::InUse(u) if u == uid => true,
+            _ => false,
+        }
+    }
+
+    pub fn is_free(&mut self) -> bool {
+        match self.read_state().get_cloned().state {
+            Status::Free => true,
+            _ => false,
+        }
+    }
 }
 
 //pub type ReturnToken = futures::channel::oneshot::Sender<()>;
@@ -228,7 +292,7 @@ pub struct MachineDescription {
 
     /// The permission required
     #[serde(flatten)]
-    pub privs: access::PrivilegesBuf,
+    pub privs: PrivilegesBuf,
 }
 
 impl MachineDescription {

src/main.rs

@@ -25,6 +25,8 @@ mod actor;
 mod initiator;
 mod space;
 
+mod resource;
+
 use clap::{App, Arg};
 
 use std::io;
@@ -169,7 +171,7 @@ fn maybe(matches: clap::ArgMatches, log: Arc<Logger>) -> Result<(), Error> {
 
         let machines = machine::load(&config)?;
         let (actor_map, actors) = actor::load(&log, &config)?;
-        let (init_map, initiators) = initiator::load(&log, &config)?;
+        let (init_map, initiators) = initiator::load(&log, &config, db.userdb.clone(), db.access.clone())?;
 
         let mut network = network::Network::new(machines, actor_map, init_map);
 

src/modules/batch.rs

@@ -1,12 +1,13 @@
+use std::io::{Read, Write};
 use std::pin::Pin;
 use std::cell::RefCell;
 
 use std::collections::HashMap;
 use std::process::Stdio;
 use smol::process::{Command, Child};
-use smol::io::{AsyncWriteExt, AsyncReadExt};
+use smol::io::{AsyncWrite, AsyncWriteExt, AsyncReadExt};
 
-use futures::future::FutureExt;
+use futures::future::{Future, FutureExt};
 
 use crate::actor::Actuator;
 use crate::initiator::Sensor;
@@ -19,13 +20,14 @@ use slog::Logger;
 use serde::{Serialize, Deserialize};
 
 pub struct Batch {
+    log: Logger,
     userdb: UserDB,
     name: String,
     cmd: String,
     args: Vec<String>,
     kill: bool,
     child: Child,
-    stdout: RefCell<Pin<Box<dyn AsyncWrite>>>,
+    stdout: Pin<Box<dyn AsyncWrite>>,
 }
 
 impl Batch {
@@ -39,24 +41,28 @@ impl Batch {
                     .collect())
             .unwrap_or_else(Vec::new);
 
-        let kill = params.get("kill_on_exit").and_then(|s|
-            s.parse()
-             .or_else(|| {
-                 warn!(log, "Can't parse `kill_on_exit` for {} set as {} as boolean. \
-                             Must be either \"True\" or \"False\".", &name, &s);
-                 false
-             }));
+        let kill = params
+            .get("kill_on_exit")
+            .and_then(|kill|
+                kill.parse()
+                    .or_else(|_| {
+                        warn!(log, "Can't parse `kill_on_exit` for {} set as {} as boolean. \
+                                    Must be either \"True\" or \"False\".", &name, &s);
+                        Ok(false)
+                    })
+                    .ok())
+            .unwrap_or(false);
 
         info!(log, "Starting {} ({})…", &name, &cmd);
         let mut child = Self::start(&name, &cmd, &args)
             .map_err(|err| error!(log, "Failed to spawn {} ({}): {}", &name, &cmd, err))
             .ok()?;
-        let stdout = Self::get_stdin(&mut child);
+        let stdout = Self::get_stdout(&mut child);
 
-        Ok(Self { userdb, name, cmd, args, kill, child, stdout })
+        Ok(Self { log, userdb, name, cmd, args, kill, child, stdout })
     }
 
-    fn start_actor(name: &String, cmd: &String, args: &Vec<String>) -> Result<Child> {
+    fn start(name: &String, cmd: &String, args: &Vec<String>) -> std::io::Result<Child> {
         let mut command = Command::new(cmd);
         command
             .stdin(Stdio::piped())
@@ -74,7 +80,7 @@ impl Batch {
         stdout.boxed_writer()
     }
 
-    fn maybe_restart(&mut self, f: &mut Option<impl Future<Item=()>>) -> bool {
+    fn maybe_restart(&mut self, f: &mut Option<BoxFuture<'static, ()>>) -> bool {
         let stat = self.child.try_status();
         if stat.is_err() {
             error!(self.log, "Can't check process for {} ({}) [{}]: {}", 
@@ -87,22 +93,22 @@ impl Batch {
             let errlog = self.log.new(o!("pid" => self.child.id()));
             // If we have any stderr try to log it
             if let Some(stderr) = self.child.stderr.take() {
-                f = Some(async move {
-                    match stderr.into_stdio().await {
-                        Err(err) => error!(errlog, "Failed to open actor process STDERR: ", err),
-                        Ok(err) => if !retv.stderr.is_empty() {
-                            let errstr = String::from_utf8_lossy(err);
+                *f = Some(Box::pin(async move {
+                    let mut out = String::new();
+                    match stderr.read_to_string(&mut out).await {
+                        Err(e) => warn!(errlog, "Failed to read child stderr: {}", e),
+                        Ok(n) => if n != 0 {
+                            let errstr = String::from_utf8_lossy(out);
                             for line in errstr.lines() {
                                 warn!(errlog, "{}", line);
                             }
                         }
-                        _ => {}
                     }
-                });
+                }));
             }
             info!(self.log, "Attempting to re-start {}", &self.name);
             let mut child = Self::start(&self.name, &self.cmd, &self.args)
-                .map_err(|err| error!(log, "Failed to spawn {} ({}): {}", &self.name, &self.cmd, err))
+                .map_err(|err| error!(self.log, "Failed to spawn {} ({}): {}", &self.name, &self.cmd, err))
                 .ok();
             // Nothing else to do with the currect architecture. In reality we should fail here
             // because we *didn't apply* the change.

src/resource.rs

@@ -0,0 +1,25 @@
+use core::sync::atomic;
+
+/// A something BFFH holds internal state of
+pub struct Resource {
+    // claims
+    strong: atomic::AtomicUsize,
+    weak: atomic::AtomicUsize,
+    max_strong: usize,
+}
+
+/// A claim is taken in lieu of an user on a resource. 
+///
+/// They come in two flavours: Weak, of which an infinite amount can exist, and Strong which may be
+/// limited in number. Strong claims represent the right of the user to use this resource
+/// "writable". A weak claim indicates co-usage of a resource and are mainly useful for notice and
+/// information of the respective other ones. E.g. a space would be strongly claimed by keyholders
+/// when they check in and released when they check out and weakly claimed by everybody else. In
+/// that case the last strong claim could also fail to be released if there are outstanding weak
+/// claims. Alternatively, releasing the last strong claim also releases all weak claims and sets
+/// the resource to "Free" again.
+///
+/// Most importantly, claims can be released by *both* the claim holder and the resource.
+pub struct Claim {
+    id: u128,
+}