move devices endpoint from app unit to api unit

lib/units/api/controllers/device.js

@@ -0,0 +1,61 @@
+var Promise = require('bluebird')
+
+var dbapi = require('../../../db/api')
+var logger = require('../../../util/logger')
+var datautil = require('../../../util/datautil')
+
+var log = logger.createLogger('api:contoller:device')
+
+module.exports = {
+  getDevices: getDevices
+, getDeviceBySerial: getDeviceBySerial
+};
+
+function getDevices(req, res) {
+  dbapi.loadDevices()
+    .then(function(cursor) {
+      return Promise.promisify(cursor.toArray, cursor)()
+        .then(function(list) {
+          list.forEach(function(device) {
+            datautil.normalize(device, req.user)
+          })
+
+          res.json({
+            success: true
+          , devices: list
+          })
+        })
+    })
+    .catch(function(err) {
+      log.error('Failed to load device list: ', err.stack)
+      res.json(500, {
+        success: false
+      })
+    })
+}
+
+function getDeviceBySerial(req, res) {
+  var serial = req.swagger.params.serial.value
+
+  dbapi.loadDevice(serial)
+    .then(function(device) {
+      if (device) {
+        datautil.normalize(device, req.user)
+        res.json({
+          success: true
+        , device: device
+        })
+      }
+      else {
+        res.json(404, {
+          success: false
+        })
+      }
+    })
+    .catch(function(err) {
+      log.error('Failed to load device "%s": ', req.params.serial, err.stack)
+      res.json(500, {
+        success: false
+      })
+    })
+}