1 # the supervisor for Plugins
2 # keeps a handle on all present plugins for managing their queries in a consistent way
3 # it is expected to exist one such object for a given page
7 from django.template.loader import render_to_string
9 from manifold.metadata import MetaData
11 from unfold.prelude import Prelude
13 from myslice.config import Config
15 # decorator to deflect calls on this Page to its prelude
16 def to_prelude (method):
17 def actual (self, *args, **kwds):
18 prelude_method=Prelude.__dict__[method.__name__]
19 return prelude_method(self.prelude,*args, **kwds)
27 def __init__ (self, request):
29 # all plugins mentioned in this page
31 # the set of all queries
33 # queue of queries with maybe a domid, see enqueue_query
35 # global prelude object
36 self.prelude=Prelude(css_files='css/plugin.css')
37 print "Loading... CSS OneLab"
38 self.prelude=Prelude(css_files='css/onelab_marko.css')
40 # record known plugins hashed on their domid
41 def record_plugin (self, plugin):
42 self._plugins[plugin.domid]=plugin
44 def get_plugin (self, domid):
45 return self._plugins.get(domid,None)
47 # not sure this is useful at all
48 # def reset_queue (self):
49 # self._queries = set()
52 # this method adds a query to the page
53 # the query will be exposed to js when calling expose_queries
54 # additionally if run_it is set to True, this query will be asynchroneously triggered on page load
55 # in this case (exec=True) the js async callback (see manifold.asynchroneous_success)
56 # offers the option to deliver the result to a specific DOM elt (in this case, set domid)
57 # otherwise (i.e. if domid not provided), it goes through the pubsub system (so all plugins can receive it)
60 # analyzed_query is required because it contains query_uuid that the
61 # plugins initialized in the python part will listen to. When a result is
62 # received in javascript, subresults should be publish to the appropriate
65 def enqueue_query (self, query, run_it=True, domid=None, analyzed_query=None):
66 # _queries is the set of all known queries
67 # XXX complex XXX self._queries = self._queries.union(set( [ query, ] ))
68 self._queries.add((query, analyzed_query))
69 # _queue is the list of queries that need to be triggered, with an optional domid
70 # we only do this if run_it is set
71 if run_it: self._queue.append ( (query.query_uuid,domid) )
73 # return the javascript code for exposing queries
74 # all queries are inserted in the global manifold object
75 # in addition, the ones enqueued with 'run_it=True' are triggered
76 def expose_queries (self):
77 # compute variables to expose to the template
79 # expose the json definition of all queries
80 env['queries_json'] = [ query.to_json(analyzed_query=aq) for (query, aq) in self._queries ]
81 def query_publish_dom_tuple (a,b):
82 result={'query_uuid':a}
83 if b: result['domid']=b
85 env['query_publish_dom_tuples'] = [ query_publish_dom_tuple (a,b) for (a,b) in self._queue ]
86 javascript = render_to_string ("page-queries.js",env)
87 self.add_js_chunks (javascript)
89 # unconditionnally expose MANIFOLD_URL, this is small and manifold.js uses that for various messages
90 self.expose_js_manifold_config()
93 # DEPRECATED # # needs to be called explicitly and only when metadata is actually required
94 # DEPRECATED # # in particular user needs to be logged
95 # DEPRECATED # def get_metadata (self):
96 # DEPRECATED # # look in session's cache - we don't want to retrieve this for every request
97 # DEPRECATED # session=self.request.session
98 # DEPRECATED # if 'manifold' not in session:
99 # DEPRECATED # print "Page.expose_js_metadata: no 'manifold' in session... - cannot retrieve metadata - skipping"
100 # DEPRECATED # return
101 # DEPRECATED # manifold=session['manifold']
102 # DEPRECATED # # if cached, use it
103 # DEPRECATED # if 'metadata' in manifold and isinstance(manifold['metadata'],MetaData):
104 # DEPRECATED # if debug: print "Page.get_metadata: return cached value"
105 # DEPRECATED # return manifold['metadata']
106 # DEPRECATED # # otherwise retrieve it
107 # DEPRECATED # manifold_api_session_auth = session['manifold']['auth']
108 # DEPRECATED # print "get_metadata(), manifold_api_session_auth =", session['manifold']['auth']
109 # DEPRECATED # metadata=MetaData (manifold_api_session_auth)
110 # DEPRECATED # metadata.fetch()
111 # DEPRECATED # # store it for next time
112 # DEPRECATED # manifold['metadata']=metadata
113 # DEPRECATED # if debug: print "Page.get_metadata: return new value"
114 # DEPRECATED # return metadata
116 # needs to be called explicitly and only when metadata is actually required
117 # in particular user needs to be logged
118 def get_metadata (self):
119 # look in session's cache - we don't want to retrieve this for every request
120 session=self.request.session
122 if 'manifold' not in session:
123 session['manifold'] = {}
124 manifold = session['manifold']
127 if 'metadata' in manifold and isinstance(manifold['metadata'],MetaData):
128 if debug: print "Page.get_metadata: return cached value"
129 return manifold['metadata']
131 metadata_auth = {'AuthMethod':'anonymous'}
133 metadata=MetaData (metadata_auth)
135 # store it for next time
136 manifold['metadata']=metadata
137 if debug: print "Page.get_metadata: return new value"
140 def expose_js_metadata (self):
141 # export in this js global...
142 self.add_js_chunks("var MANIFOLD_METADATA =" + self.get_metadata().to_json() + ";")
144 def expose_js_manifold_config (self):
146 self.add_js_chunks(config.manifold_js_export())
148 #################### requirements/prelude management
149 # just forward to self.prelude - see decorator above
151 def add_js_files (self):pass
153 def add_css_files (self):pass
155 def add_js_chunks (self):pass
157 def add_css_chunks (self):pass
159 def prelude_env (self):pass