Support for the bundle command

This is primarily meant to be used via 3rd party applications (like the
Blender Cloud). The external software requires a bundle, and if was
already build it gets served a local filesystem path, that can be
further used. Otherwise the bundle is built.

webservice/bam/application/modules/resources/model.py

@@ -0,0 +1,28 @@
+import datetime
+from application import db
+
+
+class Bundle(db.Model):
+    """Bundles are the results of a 'bam bundle' command. When running such command
+    for the first time we:
+        - create a task in the queue (see the queue module)
+        - create a bundle entry and set its status as 'waiting'
+        - executed the task (at due time)
+        - set the bundle entry status to 'building'
+        - once completed we set the status to 'available'
+        - serve the bundle_path
+
+    The bundle_path can be used but an application that shares access to the BAM
+    storage, as well as by the 'bam checkout' command itself (later on).
+
+    If this is not the case, we will provide a working download link via the 'bam info'.
+    """
+    id = db.Column(db.Integer, primary_key=True)
+    source_file_path = db.Column(db.String(512), nullable=False)
+    bundle_path = db.Column(db.String(512))
+    status = db.Column(db.String(80))
+    creation_date = db.Column(db.DateTime(), default=datetime.datetime.now)
+    update_date = db.Column(db.DateTime(), default=datetime.datetime.now)
+
+    def __str__(self):
+        return str(self.name)