1 files changed, 176 insertions, 0 deletions
diff --git a/components/script/serviceworker_manager.rs b/components/script/serviceworker_manager.rs
new file mode 100644
index 00000000000..1c24c6fef3f
--- /dev/null
+++ b/components/script/serviceworker_manager.rs
@@ -0,0 +1,176 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//! The service worker manager persists the descriptor of any registered service workers.
+//! It also stores an active workers map, which holds descriptors of running service workers.
+//! If an active service worker timeouts, then it removes the descriptor entry from its
+//! active_workers map
+
+use devtools_traits::{DevtoolsPageInfo, ScriptToDevtoolsControlMsg};
+use dom::serviceworkerglobalscope::{ServiceWorkerGlobalScope, ServiceWorkerScriptMsg};
+use dom::serviceworkerregistration::longest_prefix_match;
+use ipc_channel::ipc::{self, IpcSender};
+use ipc_channel::router::ROUTER;
+use net_traits::{CustomResponseMediator, CoreResourceMsg};
+use script_traits::{ServiceWorkerMsg, ScopeThings, SWManagerMsg, SWManagerSenders};
+use std::collections::HashMap;
+use std::sync::mpsc::{channel, Sender, Receiver, RecvError};
+use url::Url;
+use util::prefs::PREFS;
+use util::thread::spawn_named;
+
+enum Message {
+    FromResource(CustomResponseMediator),
+    FromConstellation(ServiceWorkerMsg)
+}
+
+pub struct ServiceWorkerManager {
+    // map of registered service worker descriptors
+    registered_workers: HashMap<Url, ScopeThings>,
+    // map of active service worker descriptors
+    active_workers: HashMap<Url, ScopeThings>,
+    // own sender to send messages here
+    own_sender: IpcSender<ServiceWorkerMsg>,
+    // receiver to receive messages from constellation
+    own_port: Receiver<ServiceWorkerMsg>,
+    // to receive resource messages
+    resource_receiver: Receiver<CustomResponseMediator>
+}
+
+impl ServiceWorkerManager {
+    fn new(own_sender: IpcSender<ServiceWorkerMsg>,
+           from_constellation_receiver: Receiver<ServiceWorkerMsg>,
+           resource_port: Receiver<CustomResponseMediator>) -> ServiceWorkerManager {
+        ServiceWorkerManager {
+            registered_workers: HashMap::new(),
+            active_workers: HashMap::new(),
+            own_sender: own_sender,
+            own_port: from_constellation_receiver,
+            resource_receiver: resource_port
+        }
+    }
+
+    pub fn spawn_manager(sw_senders: SWManagerSenders) {
+        let (own_sender, from_constellation_receiver) = ipc::channel().unwrap();
+        let (resource_chan, resource_port) = ipc::channel().unwrap();
+        let from_constellation = ROUTER.route_ipc_receiver_to_new_mpsc_receiver(from_constellation_receiver);
+        let resource_port = ROUTER.route_ipc_receiver_to_new_mpsc_receiver(resource_port);
+        let _ = sw_senders.resource_sender.send(CoreResourceMsg::NetworkMediator(resource_chan));
+        let _ = sw_senders.swmanager_sender.send(SWManagerMsg::OwnSender(own_sender.clone()));
+        spawn_named("ServiceWorkerManager".to_owned(), move || {
+            ServiceWorkerManager::new(own_sender, from_constellation, resource_port).handle_message();
+        });
+    }
+
+    pub fn prepare_activation(&mut self, load_url: &Url) -> Option<Sender<ServiceWorkerScriptMsg>> {
+        let mut scope_url = None;
+        for scope in self.registered_workers.keys() {
+            if longest_prefix_match(&scope, load_url) {
+                scope_url = Some(scope.clone());
+                break;
+            }
+        }
+
+        if let Some(ref scope_url) = scope_url {
+            if self.active_workers.contains_key(&scope_url) {
+                // do not run the same worker if already active.
+                warn!("Service worker for {:?} already active", scope_url);
+                return None;
+            }
+            let scope_things = self.registered_workers.get(&scope_url);
+            if let Some(scope_things) = scope_things {
+                let (sender, receiver) = channel();
+                let (devtools_sender, devtools_receiver) = ipc::channel().unwrap();
+                if let Some(ref chan) = scope_things.devtools_chan {
+                    let title = format!("ServiceWorker for {}", scope_things.script_url);
+                    let page_info = DevtoolsPageInfo {
+                        title: title,
+                        url: scope_things.script_url.clone(),
+                    };
+                    let _ = chan.send(ScriptToDevtoolsControlMsg::NewGlobal((scope_things.pipeline_id,
+                                                                             Some(scope_things.worker_id)),
+                                                                             devtools_sender.clone(),
+                                                                             page_info));
+                };
+                ServiceWorkerGlobalScope::run_serviceworker_scope(scope_things.clone(),
+                                                                              sender.clone(),
+                                                                              receiver,
+                                                                              devtools_receiver,
+                                                                              self.own_sender.clone(),
+                                                                              scope_url.clone());
+                // We store the activated worker
+                self.active_workers.insert(scope_url.clone(), scope_things.clone());
+                return Some(sender);
+            } else {
+                warn!("Unable to activate service worker");
+            }
+        }
+        None
+    }
+
+    fn handle_message(&mut self) {
+        while let Ok(message) = self.receive_message() {
+            let should_continue = match message {
+                Message::FromConstellation(msg) => {
+                    self.handle_message_from_constellation(msg)
+                },
+                Message::FromResource(msg) => {
+                    self.handle_message_from_resource(msg)
+                }
+            };
+            if !should_continue {
+                break;
+            }
+        }
+    }
+
+    fn handle_message_from_constellation(&mut self, msg: ServiceWorkerMsg) -> bool {
+        match msg {
+            ServiceWorkerMsg::RegisterServiceWorker(scope_things, scope) => {
+                if self.registered_workers.contains_key(&scope) {
+                    warn!("ScopeThings for {:?} already stored in SW-Manager", scope);
+                } else {
+                    self.registered_workers.insert(scope, scope_things);
+                }
+                true
+            }
+            ServiceWorkerMsg::Timeout(scope) => {
+                if self.active_workers.contains_key(&scope) {
+                    let _ = self.active_workers.remove(&scope);
+                } else {
+                    warn!("ScopeThings for {:?} is not active", scope);
+                }
+                true
+            }
+            ServiceWorkerMsg::Exit => false
+        }
+    }
+
+    #[inline]
+    fn handle_message_from_resource(&mut self, mediator: CustomResponseMediator) -> bool {
+        if serviceworker_enabled() {
+            let worker_sender = self.prepare_activation(&mediator.load_url);
+            if let Some(ref sender) = worker_sender {
+                let _ = sender.send(ServiceWorkerScriptMsg::Response(mediator));
+            }
+        } else {
+            let _ = mediator.response_chan.send(None);
+        }
+        true
+    }
+
+    #[allow(unsafe_code)]
+    fn receive_message(&mut self) -> Result<Message, RecvError> {
+        let msg_from_constellation = &self.own_port;
+        let msg_from_resource = &self.resource_receiver;
+        select! {
+            msg = msg_from_constellation.recv() => msg.map(Message::FromConstellation),
+            msg = msg_from_resource.recv() => msg.map(Message::FromResource)
+        }
+    }
+}
+
+pub fn serviceworker_enabled() -> bool {
+    PREFS.get("dom.serviceworker.enabled").as_boolean().unwrap_or(false)
+}