From d14a63c2d462e98f18eaee7cb8f52a3baa30851d Mon Sep 17 00:00:00 2001
From: Aleksey Lim <alsroot@sugarlabs.org>
Date: Mon, 01 Oct 2012 04:25:33 +0000
Subject: Reflect on ad.diff() changes in treating blobs

---
diff --git a/sugar_network/resources/volume.py b/sugar_network/resources/volume.py
index bf4fd70..52b8857 100644
--- a/sugar_network/resources/volume.py
+++ b/sugar_network/resources/volume.py
@@ -15,6 +15,7 @@
 
 import json
 import logging
+import tempfile
 from os.path import join
 
 import active_document as ad
@@ -22,6 +23,8 @@ from active_document import directory as ad_directory
 from sugar_network import local
 from sugar_network.toolkit.sneakernet import DiskFull
 from sugar_network.toolkit.collection import Sequence
+from sugar_network.toolkit import http
+from active_toolkit.sockets import BUFFER_SIZE
 from active_toolkit import coroutine
 
 
@@ -75,6 +78,7 @@ class Volume(ad.SingleVolume):
         if document_classes is None:
             document_classes = Volume.RESOURCES
         ad.SingleVolume.__init__(self, root, document_classes, lazy_open)
+        self._downloader = None
 
     def notify(self, event):
         if event['event'] == 'update' and 'props' in event and \
@@ -87,9 +91,11 @@ class Volume(ad.SingleVolume):
     def merge(self, record, increment_seqno=True):
         coroutine.dispatch()
         if record.get('content_type') == 'blob':
-            record['diff'] = record['blob']
-        return self[record['document']].merge(increment_seqno=increment_seqno,
-                **record)
+            diff = record['blob']
+        else:
+            diff = record['diff']
+        return self[record['document']].merge(record['guid'], diff,
+                increment_seqno=increment_seqno)
 
     def diff(self, in_seq, out_packet):
         # Since `in_seq` will be changed in `patch()`, original sequence
@@ -103,27 +109,30 @@ class Volume(ad.SingleVolume):
             directory.commit()
 
             def patch():
-                for meta, data in directory.diff(orig_seq, limit=_DIFF_CHUNK):
+                for guid, seqno, diff in \
+                        directory.diff(orig_seq, limit=_DIFF_CHUNK):
                     coroutine.dispatch()
 
-                    seqno = None
-                    if 'seqno' in meta:
-                        seqno = meta.pop('seqno')
-
-                    if hasattr(data, 'fileno'):
-                        arcname = join(document, 'blobs', meta['guid'],
-                                meta['prop'])
-                        out_packet.push(data, arcname=arcname,
-                                cmd='sn_push', document=document, **meta)
-                    else:
-                        meta['diff'] = data
-                        yield meta
-
-                    # Process `seqno` only after processing yield'ed data
-                    if seqno:
-                        # Update `in_seq`, it might be reused by caller
-                        in_seq.exclude(seqno, seqno)
-                        push_seq.include(seqno, seqno)
+                    for prop, value in diff.items():
+                        if 'path' in value:
+                            data = file(value.pop('path'), 'rb')
+                        elif 'url' in value:
+                            data = self._download_blob(value.pop('url'))
+                        else:
+                            continue
+                        del diff[prop]
+                        arcname = join(document, 'blobs', guid, prop)
+                        out_packet.push(data, arcname=arcname, cmd='sn_push',
+                                document=document, guid=guid, **value)
+
+                    if not diff:
+                        continue
+
+                    yield {'guid': guid, 'diff': diff}
+
+                    # Update `in_seq`, it might be reused by caller
+                    in_seq.exclude(seqno, seqno)
+                    push_seq.include(seqno, seqno)
 
             try:
                 out_packet.push(patch(), arcname=join(document, 'diff'),
@@ -141,6 +150,29 @@ class Volume(ad.SingleVolume):
             orig_seq.floor(push_seq.last)
             out_packet.push(force=True, cmd='sn_commit', sequence=orig_seq)
 
+    def _download_blob(self, url):
+        _logger.debug('Download %r blob', url)
+
+        if self._downloader is None:
+            self._downloader = http.Client()
+
+        response = self._downloader.request('GET', url, allow_redirects=True)
+        content_length = response.headers.get('Content-Length')
+        content_length = int(content_length) if content_length else 0
+
+        ostream = tempfile.NamedTemporaryFile()
+        try:
+            chunk_size = min(content_length, BUFFER_SIZE)
+            # pylint: disable-msg=E1103
+            for chunk in response.iter_content(chunk_size=chunk_size):
+                ostream.write(chunk)
+        except Exception:
+            ostream.close()
+            raise
+
+        ostream.seek(0)
+        return ostream
+
 
 class Commands(object):
 
diff --git a/sugar_network/toolkit/http.py b/sugar_network/toolkit/http.py
index 69a7acb..f801942 100644
--- a/sugar_network/toolkit/http.py
+++ b/sugar_network/toolkit/http.py
@@ -53,7 +53,7 @@ _logger = logging.getLogger('http')
 
 class Client(object):
 
-    def __init__(self, api_url, sugar_auth=False, **kwargs):
+    def __init__(self, api_url='', sugar_auth=False, **kwargs):
         self.api_url = api_url
         self.params = kwargs
         self._sugar_auth = sugar_auth
@@ -82,6 +82,10 @@ class Client(object):
     def close(self):
         self._session.close()
 
+    def exists(self, path):
+        response = self.request('GET', path, allowed=[404], params=self.params)
+        return response.status_code != 404
+
     def get(self, path_=None, **kwargs):
         kwargs.update(self.params)
         response = self.request('GET', path_, params=kwargs)
diff --git a/tests/units/sync_master.py b/tests/units/sync_master.py
index ab24292..d2e2448 100755
--- a/tests/units/sync_master.py
+++ b/tests/units/sync_master.py
@@ -529,7 +529,7 @@ class SyncMasterTest(tests.Test):
 
         def diff(*args, **kwargs):
             for i in range(1024):
-                yield {'guid': str(i), 'seqno': i}, {}
+                yield str(i), i, {}
                 coroutine.sleep(.1)
 
         self.override(Directory, 'diff', diff)
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