add POST request to get comment counts for multiple URLs

The old way via `GET /count?uri=...` still works, but is now deprecated
and might be removed in future releases.
The new way is much more efficient especially fore multiple listings.

The internal implemention is improvable though.

isso/compat.py

@@ -8,6 +8,8 @@ if not PY2K:
     map, zip, filter = map, zip, filter
     from functools import reduce
 
+    iteritems = lambda dikt: iter(dikt.items())
+
     text_type = str
     string_types = (str, )
 
@@ -18,6 +20,8 @@ else:
     map, zip, filter = imap, izip, ifilter
     reduce = reduce
 
+    iteritems = lambda dikt: dikt.iteritems()
+
     text_type = unicode
     string_types = (str, unicode)
 

isso/db/comments.py

@@ -175,14 +175,18 @@ class Comments:
             return {'likes': likes + 1, 'dislikes': dislikes}
         return {'likes': likes, 'dislikes': dislikes + 1}
 
-    def count(self, uri):
+    def count(self, *urls):
         """
-        Return comment count for :param:`uri`.
+        Return comment count for one ore more urls..
         """
-        return self.db.execute([
-            'SELECT COUNT(comments.id) FROM comments INNER JOIN threads ON',
-            '    threads.uri=? AND comments.tid=threads.id AND comments.mode=1;'],
-            (uri, )).fetchone()
+
+        threads = dict(self.db.execute([
+            'SELECT threads.uri, COUNT(comments.id) FROM comments',
+            'LEFT OUTER JOIN threads ON threads.id = tid',
+            'GROUP BY threads.uri'
+        ]).fetchall())
+
+        return [threads.get(url, 0) for url in urls]
 
     def purge(self, delta):
         """

isso/js/app/api.js

@@ -139,13 +139,11 @@ define(["app/lib/promise", "app/globals"], function(Q, globals) {
         return deferred.promise;
     };
 
-    var count = function(tid) {
+    var count = function(urls) {
         var deferred = Q.defer();
-        curl("GET", endpoint + "/count?" + qs({uri: tid || location}), null, function(rv) {
+        curl("POST", endpoint + "/count", JSON.stringify(urls), function(rv) {
             if (rv.status === 200) {
                 deferred.resolve(JSON.parse(rv.body));
-            } else if (rv.status === 404) {
-                deferred.resolve(0);
             } else {
                 deferred.reject(rv.body);
             }

isso/js/app/count.js

@@ -1,5 +1,8 @@
 define(["app/api", "app/dom", "app/markup"], function(api, $, Mark) {
     return function() {
+
+        var objs = {};
+
         $.each("a", function(el) {
             if (! el.href.match("#isso-thread$")) {
                 return;
@@ -9,9 +12,28 @@ define(["app/api", "app/dom", "app/markup"], function(api, $, Mark) {
                       el.href.match("^(.+)#isso-thread$")[1]
                              .replace(/^.*\/\/[^\/]+/, '');
 
-            api.count(tid).then(function(rv) {
-                el.textContent = Mark.up("{{ i18n-num-comments | pluralize : `n` }}", {n: rv});
-            });
+            if (tid in objs) {
+                objs[tid].push(el);
+            } else {
+                objs[tid] = [el];
+            }
+        });
+
+        var urls = Object.keys(objs);
+
+        api.count(urls).then(function(rv) {
+            for (var key in objs) {
+                if (objs.hasOwnProperty(key)) {
+
+                    var index = urls.indexOf(key);
+
+                    for (var i = 0; i < objs[key].length; i++) {
+                        objs[key][i].textContent = Mark.up(
+                            "{{ i18n-num-comments | pluralize : `n` }}",
+                            {n: rv[index]});
+                    }
+                }
+            }
         });
     };
 });

isso/views/comments.py

@@ -16,7 +16,7 @@ from werkzeug.exceptions import BadRequest, Forbidden, NotFound
 from isso.compat import text_type as str
 
 from isso import utils, local
-from isso.utils import http, parse, html, JSONResponse as JSON
+from isso.utils import http, parse, JSONResponse as JSON
 from isso.utils.crypto import pbkdf2
 from isso.views import requires
 
@@ -61,6 +61,7 @@ class API(object):
         ('fetch',   ('GET', '/')),
         ('new',     ('POST', '/new')),
         ('count',   ('GET', '/count')),
+        ('counts',  ('POST', '/count')),
         ('view',    ('GET', '/id/<int:id>')),
         ('edit',    ('PUT', '/id/<int:id>')),
         ('delete',  ('DELETE', '/id/<int:id>')),
@@ -352,6 +353,7 @@ class API(object):
         nv = self.comments.vote(False, id, utils.anonymize(str(request.remote_addr)))
         return JSON(nv, 200)
 
+    # TODO: remove someday (replaced by :func:`counts`)
     @requires(str, 'uri')
     def count(self, environ, request, uri):
 
@@ -362,5 +364,14 @@ class API(object):
 
         return JSON(rv, 200)
 
+    def counts(self, environ, request):
+
+        data = request.get_json()
+
+        if not isinstance(data, list) and not all(isinstance(x, str) for x in data):
+            raise BadRequest("JSON must be a list of URLs")
+
+        return JSON(self.comments.count(*data), 200)
+
     def checkip(self, env, req):
         return Response(utils.anonymize(str(req.remote_addr)), 200)

specs/test_comments.py

@@ -22,6 +22,8 @@ from isso import Isso, core
 from isso.utils import http
 from isso.views import comments
 
+from isso.compat import iteritems
+
 from fixtures import curl, loads, FakeIP, JSONClient
 http.curl = curl
 
@@ -274,6 +276,17 @@ class TestComments(unittest.TestCase):
         rv = self.get('/count?uri=%2Fpath%2F')
         self.assertEqual(rv.status_code, 404)
 
+    def testMultipleCounts(self):
+
+        expected = {'a': 1, 'b': 2, 'c': 0}
+
+        for uri, count in iteritems(expected):
+            for _ in range(count):
+                self.post('/new?uri=%s' % uri, data=json.dumps({"text": "..."}))
+
+        rv = self.post('/count', data=json.dumps(list(expected.keys())))
+        self.assertEqual(loads(rv.data), list(expected.values()))
+
     def testModify(self):
         self.post('/new?uri=test', data=json.dumps({"text": "Tpyo"}))