Update README to show pagerank and add DataAuths to python user

gh-595-pyspark-api
Add to python-api README
Include data auths in the python user
Change PythonSerialiserConfig to look for the nested json object "serialisers" within the python config json

python-api/README.md

@@ -121,7 +121,7 @@ rdd_op = gp.GetPySparkRDDOfAllElements(view=view)
 rdd = graph.execute(rdd_op, user)
 ```
 
-USe pyspark to calculate the distribution of counts
+Use pyspark to calculate the distribution of counts
 
 ```
 def getCount(edge):
@@ -130,6 +130,39 @@ def getCount(edge):
 count_distribution = rdd.map(getCount).reduceByKey(lambda a, b: a + b).collect()
 ```
 
+Use pyspark to create a GraphFrame
+
+```
+from gafferpy_pyspark import gaffer_pyspark as gp
+from graphframes import *
+
+edge=g.ElementDefinition(group="YOUR_EDGE_GROUP",group_by=[])
+entity=g.ElementDefinition(group="YOUR_ENTITY_GROUP",group_by=[])
+entityView=g.View(
+    entities=[entity]
+)
+edgeView=g.View(
+    edges=[edge]
+)
+
+df_entity_op = gp.GetPysparkDataFrameOfElements(entityView, sampleRatio=0.1)
+df_edge_op = gp.GetPysparkDataFrameOfElements(edgeView, sampleRatio=0.1)
+df_entity = graph.execute(df_entity_op, user)
+df_edge = graph.execute(df_edge_op, user)
+
+edges = df_edge.withColumnRenamed("destination", "dst").withColumnRenamed("source", "src")
+entities = df_entity.withColumnRenamed("vertex", "id")
+
+gf = GraphFrame(entities, edges)
+```
+
+Use pyspark to run Page Rank on a GraphFrame
+
+```
+results = gf.pageRank(resetProbability=0.15, maxIter=10)
+results.vertices.show()
+```
+
 ### Use with larger graphs ###
 
 If you already have a large Gaffer instance running and want to use the pyspark api with it, follow the same steps above except that you will need to point to the larger graph's schema, graphconfig and store-properties files when you create the python graph object.

python-api/gafferpy-core/src/main/java/uk/gov/gchq/gaffer/python/data/serialiser/config/PythonSerialiserConfig.java

@@ -51,17 +51,18 @@ public PythonSerialiserConfig(final FileInputStream fis) {
     }
 
     public PythonSerialiserConfig(final byte[] bytes) {
-        Map<String, String> map = null;
+        Map<String, Object> map = null;
+        Map<String, String> serialisersMap = null;
         this.serialisers = new HashMap<>();
         try {
                 map = JSONSerialiser.deserialise(bytes, Map.class);
-            } catch (final SerialisationException e) {
-                e.printStackTrace();
-            }
-
-        for (final String s : map.keySet()) {
+                serialisersMap = (Map<String, String>) map.get("serialisers");
+        } catch (final SerialisationException e) {
+            e.printStackTrace();
+        }
+        for (final String s : serialisersMap.keySet()) {
             try {
-                this.serialisers.put(Class.forName(s), Class.forName(map.get(s)));
+                this.serialisers.put(Class.forName(s), Class.forName(serialisersMap.get(s)));
             } catch (final ClassNotFoundException e) {
                 e.printStackTrace();
             }

python-api/gafferpy-core/src/main/python/gafferpy_core/gaffer_utils.py

@@ -97,9 +97,15 @@ def convertElement(input):
 class User(g.ToJson):
     CLASS='uk.gov.gchq.gaffer.user.User'
 
-    def __init__(self, user_id=None):
+    def __init__(self, user_id=None, data_auths=None):
         self._class_name=self.CLASS,
         self.user_id=user_id;
+        self.data_auths=data_auths;
 
     def to_json(self):
-        return {'userId': self.user_id}
+        json = {}
+        if self.user_id is not None:
+            json['userId'] = self.user_id
+        if self.data_auths is not None:
+            json['dataAuths'] = self.data_auths
+        return json