split engine/ into manifold/ (backend oriented) and unfold/ (the UI)

[unfold.git] / manifold / manifoldquery.py

diff --git a/manifold/manifoldquery.py b/manifold/manifoldquery.py
new file mode 100644 (file)
index 0000000..4ee9c01
--- /dev/null
+++ b/manifold/manifoldquery.py
@@ -0,0 +1,145 @@
+import json
+import uuid
+
+def uniqid (): 
+    return uuid.uuid4().hex
+
+class ManifoldQuery:
+
+    def __init__ (self, action=None, method=None, timestamp='now',
+                  filters=[], params=[], fields=[],
+                  sort=None, limit=None, offset=None,
+                  ):
+        self.uuid=uniqid()
+        # settable
+        self.action=action
+        self.method=method
+        self.timestamp=timestamp
+        self.filters=filters
+        self.params=params
+        self.fields=fields
+        self.sort=sort
+        self.limit=limit
+        self.offset=offset
+        # internal data
+        self.analyzed_query=None
+        self.subqueries = {}
+
+    def to_json (self):
+        uuid=self.uuid
+        a=self.action
+        m=self.method
+        t=self.timestamp
+        f=json.dumps (self.filters)
+        p=json.dumps (self.params)
+        c=json.dumps (self.fields)
+        # xxx unique can be removed, but for now we pad the js structure
+        unique=0
+
+        aq = self.analyzed_query.to_json() if self.analyzed_query else 'null'
+        # subqueries is a dictionary method:query
+        if not self.subqueries: 
+            sq="{}"
+        else:
+            sq=", ".join ( [ "'%s':%s" % (method, subquery.to_json())
+                      for (method, subquery) in self.subqueries.iteritems()])
+            sq="{%s}"%sq
+        
+        return """ new ManifoldQuery('%(a)s', '%(m)s', '%(t)s', %(f)s, %(p)s, %(c)s, %(unique)s, '%(uuid)s', %(aq)s, %(sq)s)"""%locals()
+    
+    # this builds a ManifoldQuery object from a dict as received from javascript through its ajax request 
+    # e.g. here's what I captured from the server's output
+    # incoming POST <QueryDict: {u'query[method]': [u'slice'], u'query[fields][]': [u'slice_hrn'], u'query[timestamp]': [u'latest'], u'query[action]': [u'get']}>
+    def fill_from_dict (self, d):
+        for key in d.keys():
+            for arg in ['action', 'method', 'filters', 'fields', 'timestamp', 'params']:
+                if arg in key:
+                    # dirty hack around fields; fields must be a list
+                    if arg == 'fields': 
+                        setattr(self, arg, [d[key]])
+                    else: 
+                        setattr(self, arg, d[key])
+                    break
+
+
+
+    def analyze_subqueries(self):
+        analyzed_query = ManifoldQuery()
+        analyzed_query.uuid = self.uuid
+        analyzed_query.action = self.action
+        analyzed_query.method = self.method
+        analyzed_query.timestamp = self.timestamp
+
+        # analyse query filters
+        # filter syntax : ['key', 'oparation', 'value']
+        for filter in self.filters:
+            key = filter[0]
+            operation = filter[1]
+            value = filter[2]
+            if '.' in key:
+                method = key.split('.')[0]
+                field = key.split('.')[1]
+                if not analyzed_query.subqueries[method]:
+                    subquery = ManifoldQuery()
+                    subquery.action = self.action
+                    subquery.method = method
+                    subquery.timestamp = self.timestamp
+                    analyzed_query.subqueries[method] = subquery
+
+                analyzed_query.subqueries[method].filters.append([field, operation, value])
+            else:
+                analyzed_query.filters.append(filter)
+
+        # analyse query params
+        # params syntax : params = {'param1': value1, 'param2': value2, ...}
+        for param in self.params.keys():
+            if '.' in param:
+                method = param.split('.')[0]
+                field = param.split('.')[1]
+                if not analyzed_query.subqueries[method]:
+                    subquery = ManifoldQuery()
+                    subquery.action = self.action
+                    subquery.method = method
+                    subquery.timestamp = self.timestamp
+                    analyzed_query.subqueries[method] = subquery
+
+                analyzed_query.subqueries[method].params[field] = self.params[param]
+            else:
+                analyzed_query.params[param] = self.params[param]
+
+        # analyse query fields
+        # fields syntax: fields = [element1, element2, ....]
+        for element in self.fields:
+            if '.' in element:
+                method = element.split('.')[0]
+                field = element.split('.')[1]
+                if not analyzed_query.subqueries[method]:
+                    subquery = ManifoldQuery()
+                    subquery.action = self.action
+                    subquery.method = method
+                    subquery.timestamp = self.timestamp
+                    analyzed_query.subqueries[method] = subquery
+
+                analyzed_query.subqueries[method].fields.append(field)
+            else:
+                analyzed_query.fields.append(element)        
+
+
+        # default subqueries 
+        if analyzed_query.method == 'slice':
+            if not analyzed_query.subqueries['resource']:
+                subquery = ManifoldQuery()
+                subquery.action = self.action
+                subquery.method = method
+                subquery.timestamp = self.timestamp
+                analyzed_query.subqueries['resource'] = subquery
+
+            if not analyzed_query.subqueries['lease']:
+                subquery = ManifoldQuery()
+                subquery.action = self.action
+                subquery.method = method
+                subquery.timestamp = self.timestamp
+                analyzed_query.subqueries['lease'] = subquery
+
+
+        self.analyzed_query = analyzed_query