Reap dead devices using timeouts. Previously, if a provider died without being able to clean up properly, the device would stay as a ghost.

lib/db/api.js

@@ -7,6 +7,10 @@ var wireutil = require('../wire/util')
 
 var dbapi = Object.create(null)
 
+dbapi.close = function(options) {
+  return db.close(options)
+}
+
 dbapi.saveUserAfterLogin = function(user) {
   return db.run(r.table('users').get(user.email).update({
       name: user.name
@@ -56,6 +60,7 @@ dbapi.saveDevice = function(serial, device) {
     , status: device.status
     , statusChangedAt: r.now()
     , createdAt: r.now()
+    , lastHeartbeatAt: r.now()
     }
   , {
       upsert: true
@@ -84,6 +89,7 @@ dbapi.unsetDeviceOwner = function(serial, owner) {
 dbapi.setDeviceAbsent = function(serial) {
   return db.run(r.table('devices').get(serial).update({
     present: false
+  , lastHeartbeatAt: null
   }))
 }
 
@@ -114,4 +120,26 @@ dbapi.loadDevice = function(serial) {
   return db.run(r.table('devices').get(serial))
 }
 
+dbapi.updateDeviceHeartbeat = function(serial) {
+  return db.run(
+    r.table('devices').get(serial).update({
+      lastHeartbeatAt: r.now()
+    })
+  , {
+      noreply: true
+    , durability: 'soft'
+    }
+  )
+}
+
+dbapi.getDeadDevices = function(timeout) {
+  return db.run(
+    r.table('devices')
+      .between(null, r.now().sub(timeout / 1000), {
+        index: 'lastHeartbeatAt'
+      })
+      .pluck('serial')
+  )
+}
+
 module.exports = dbapi