updater: provide incrementals if any are found for the given version

* No functionality change if no incrementals are in the database, but
  if there are for the user's given version, those are provided rather
  than full roms. The future is now.

README.md

@@ -70,10 +70,10 @@ Options:
 Example API Calls:
 ---
 Obtaining rom list for a device:<br>
-`GET /api/v1/<device>/<romtype>/<incremental>?after=<utc_timestamp>&version=<14.1>` (incremental can be anything, it is currently unused)<br>
+`GET /api/v1/<device>/<romtype>/<incremental>?after=<utc_timestamp>&version=<14.1>`
 `<device>` - Name of device. Example: `d2vzw`<br>
 `<romtype>` - Type of rom. Example: `nightly`<br>
-`<incremental>` - Caller device's incremental ID (ro.build.incr). Can be anything. <br>
+`<incremental>` - Caller device's incremental ID (ro.build.incr). If any zips are available that updates the given incremental version, those are provided rather than full roms.<br>
 `<after>` - Timestamp for current build on device. (optional) <br> 
 `<romversion>` - Version of rom. Example: `14.1`(optional)<br>
 

updater/app.py

@@ -2,7 +2,7 @@
 
 from updater.changelog.gerrit import GerritServer, GerritJSONEncoder
 from updater.changelog import get_changes, get_timestamp
-from updater.database import Rom, ApiKey, Device
+from updater.database import Rom, ApiKey, Device, Incremental
 
 from flask import Flask, jsonify, request, abort, render_template
 from flask_mongoengine import MongoEngine
@@ -101,7 +101,13 @@ def check_builds():
 
 @cache.memoize(timeout=3600)
 def get_build_types(device, romtype, after, version):
-    roms = Rom.get_roms(device=device, romtype=romtype, before=app.config['BUILD_SYNC_TIME'])
+    roms = []
+
+    roms = Incremental.get_incrementals(device=device, romtype=romtype, before=app.config['BUILD_SYNC_TIME'], incremental=incrementalversion)
+
+    if not len(roms):
+        roms = Rom.get_roms(device=device, romtype=romtype, before=app.config['BUILD_SYNC_TIME'])
+
     if after:
         roms = roms(datetime__gt=after)
     if version:

updater/database.py

@@ -52,6 +52,54 @@ def get_device_version(cls, device):
             return None
         return cls.objects(device=device).first()['version']
 
+class Incremental(Document):
+    filename = StringField(required=True)
+    datetime = DateTimeField(required=True, default=default_time)
+    device = StringField(required=True)
+    version = StringField(required=True)
+    romtype = StringField(required=True)
+    md5sum = StringField(required=True)
+    url = StringField()
+    from_incremental = StringField(required=True)
+    to_incremental = StringField(required=True)
+
+    @classmethod
+    def get_incrementals(cls, device, romtype=None, before=3600, incremental=None):
+        args = {
+            'device': device,
+            'romtype': romtype,
+            'datetime__lt': datetime.now()-timedelta(seconds=before),
+            'from_incremental': incremental
+        }
+        if before == 0:
+            del args['datetime__lt']
+        if not romtype:
+            del args['romtype']
+        return cls.objects(**args).order_by('-datetime')
+
+    @classmethod
+    def get_devices(cls):
+        #TODO change this to an aggregate
+        return cls.objects().distinct(field="device")
+
+    @classmethod
+    def get_types(cls, device):
+        return cls.objects().distinct(field="romtype")
+
+    @classmethod
+    def get_current_devices_by_version(cls):
+        # db.rom.aggregate({'$group': {'_id': '$version', 'device': {'$push': '$device'}}})
+        versions = {}
+        for version in cls.objects().aggregate({'$group': {'_id': '$version', 'devices': {'$push': '$device'}}}):
+            versions[version['_id']] = version['devices']
+        return versions
+
+    @classmethod
+    def get_device_version(cls, device):
+        if not device:
+            return None
+        return cls.objects(device=device).first()['version']
+
 class Device(Document):
     model = StringField(required=True, unique=True)
     oem = StringField(required=True)