we embed the (currently raw) results from manifold API in a ManifoldResult dict

[myslice.git] / manifold / metadata.py

diff --git a/manifold/metadata.py b/manifold/metadata.py
index 8aed126..c092dfd 100644 (file)
--- a/manifold/metadata.py
+++ b/manifold/metadata.py
@@ -1,7 +1,15 @@
 import json 
 
+from manifold.manifoldresult import ManifoldResult
 from manifold.manifoldapi import ManifoldAPI
 
+debug=False
+debug=True
+
+# turn this on if you want to work offline
+work_offline=False
+#work_offline=True
+
 class MetaData:
 
     def __init__ (self, auth):
@@ -9,6 +17,14 @@ class MetaData:
         self.hash_by_subject={}
 
     def fetch (self):
+        offline_filename="offline-metadata.json"
+        if work_offline:
+            try:
+                with file(offline_metadata) as f:
+                    self.hash_by_subject=json.loads(f.read())
+                return
+            except:
+                print "metadata.work_offline: failed to decode %s"%offline_filename
         manifold_api = ManifoldAPI(self.auth)
         fields = ['table', 'column.column',
                   'column.description','column.header', 'column.title',
@@ -16,8 +32,15 @@ class MetaData:
                   'column.resource_type', 'column.value_type',
                   'column.allowed_values', 'column.platforms.platform',
                   'column.platforms.platform_url']
-        results = manifold_api.Get('metadata:table', [], [], fields)
-        self.hash_by_subject = dict ( [ (result['table'], result) for result in results ] )
+        rows_result = manifold_api.Get('metadata:table', [], [], fields)
+        rows = rows_result.ok_value()
+        if not rows:
+            print "Failed to retrieve metadata",rows_result.error()
+        self.hash_by_subject = dict ( [ (row['table'], row) for row in rows ] )
+        # save for next time we use offline mode
+        if debug:
+            with file(offline_filename,'w') as f:
+                f.write(json.dumps(self.hash_by_subject))
 
     def to_json(self):
         return json.dumps(self.hash_by_subject)