We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Fix bytes/unicode issue to fix test on Python 3


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `master/buildbot/db/schedulers.py`
Content:
```
1 # This file is part of Buildbot.  Buildbot is free software: you can
2 # redistribute it and/or modify it under the terms of the GNU General Public
3 # License as published by the Free Software Foundation, version 2.
4 #
5 # This program is distributed in the hope that it will be useful, but WITHOUT
6 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
7 # FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
8 # details.
9 #
10 # You should have received a copy of the GNU General Public License along with
11 # this program; if not, write to the Free Software Foundation, Inc., 51
12 # Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
13 #
14 # Copyright Buildbot Team Members
15 
16 import sqlalchemy as sa
17 import sqlalchemy.exc
18 
19 from buildbot.db import NULL
20 from buildbot.db import base
21 from twisted.internet import defer
22 
23 
24 class SchedulerAlreadyClaimedError(Exception):
25     pass
26 
27 
28 class SchedulersConnectorComponent(base.DBConnectorComponent):
29     # Documentation is in developer/db.rst
30 
31     def classifyChanges(self, schedulerid, classifications):
32         def thd(conn):
33             transaction = conn.begin()
34             tbl = self.db.model.scheduler_changes
35             ins_q = tbl.insert()
36             upd_q = tbl.update(
37                 ((tbl.c.schedulerid == schedulerid)
38                  & (tbl.c.changeid == sa.bindparam('wc_changeid'))))
39             for changeid, important in classifications.items():
40                 # convert the 'important' value into an integer, since that
41                 # is the column type
42                 imp_int = important and 1 or 0
43                 try:
44                     conn.execute(ins_q,
45                                  schedulerid=schedulerid,
46                                  changeid=changeid,
47                                  important=imp_int)
48                 except (sqlalchemy.exc.ProgrammingError,
49                         sqlalchemy.exc.IntegrityError):
50                     transaction.rollback()
51                     transaction = conn.begin()
52                     # insert failed, so try an update
53                     conn.execute(upd_q,
54                                  wc_changeid=changeid,
55                                  important=imp_int)
56 
57             transaction.commit()
58         return self.db.pool.do(thd)
59 
60     def flushChangeClassifications(self, schedulerid, less_than=None):
61         def thd(conn):
62             sch_ch_tbl = self.db.model.scheduler_changes
63             wc = (sch_ch_tbl.c.schedulerid == schedulerid)
64             if less_than is not None:
65                 wc = wc & (sch_ch_tbl.c.changeid < less_than)
66             q = sch_ch_tbl.delete(whereclause=wc)
67             conn.execute(q)
68         return self.db.pool.do(thd)
69 
70     def getChangeClassifications(self, schedulerid, branch=-1,
71                                  repository=-1, project=-1,
72                                  codebase=-1):
73         # -1 here stands for "argument not given", since None has meaning
74         # as a branch
75         def thd(conn):
76             sch_ch_tbl = self.db.model.scheduler_changes
77             ch_tbl = self.db.model.changes
78 
79             wc = (sch_ch_tbl.c.schedulerid == schedulerid)
80 
81             # may need to filter further based on branch, etc
82             extra_wheres = []
83             if branch != -1:
84                 extra_wheres.append(ch_tbl.c.branch == branch)
85             if repository != -1:
86                 extra_wheres.append(ch_tbl.c.repository == repository)
87             if project != -1:
88                 extra_wheres.append(ch_tbl.c.project == project)
89             if codebase != -1:
90                 extra_wheres.append(ch_tbl.c.codebase == codebase)
91 
92             # if we need to filter further append those, as well as a join
93             # on changeid (but just once for that one)
94             if extra_wheres:
95                 wc &= (sch_ch_tbl.c.changeid == ch_tbl.c.changeid)
96                 for w in extra_wheres:
97                     wc &= w
98 
99             q = sa.select(
100                 [sch_ch_tbl.c.changeid, sch_ch_tbl.c.important],
101                 whereclause=wc)
102             return dict([(r.changeid, [False, True][r.important])
103                          for r in conn.execute(q)])
104         return self.db.pool.do(thd)
105 
106     def findSchedulerId(self, name):
107         tbl = self.db.model.schedulers
108         name_hash = self.hashColumns(name)
109         return self.findSomethingId(
110             tbl=tbl,
111             whereclause=(tbl.c.name_hash == name_hash),
112             insert_values=dict(
113                 name=name,
114                 name_hash=name_hash,
115             ))
116 
117     def setSchedulerMaster(self, schedulerid, masterid):
118         def thd(conn):
119             sch_mst_tbl = self.db.model.scheduler_masters
120 
121             # handle the masterid=None case to get it out of the way
122             if masterid is None:
123                 q = sch_mst_tbl.delete(
124                     whereclause=(sch_mst_tbl.c.schedulerid == schedulerid))
125                 conn.execute(q)
126                 return
127 
128             # try a blind insert..
129             try:
130                 q = sch_mst_tbl.insert()
131                 conn.execute(q,
132                              dict(schedulerid=schedulerid, masterid=masterid))
133             except (sa.exc.IntegrityError, sa.exc.ProgrammingError):
134                 # someone already owns this scheduler.
135                 raise SchedulerAlreadyClaimedError
136 
137         return self.db.pool.do(thd)
138 
139     @defer.inlineCallbacks
140     def getScheduler(self, schedulerid):
141         sch = yield self.getSchedulers(_schedulerid=schedulerid)
142         if sch:
143             defer.returnValue(sch[0])
144 
145     def getSchedulers(self, active=None, masterid=None, _schedulerid=None):
146         def thd(conn):
147             sch_tbl = self.db.model.schedulers
148             sch_mst_tbl = self.db.model.scheduler_masters
149 
150             # handle the trivial case of masterid=xx and active=False
151             if masterid is not None and active is not None and not active:
152                 return []
153 
154             join = sch_tbl.outerjoin(sch_mst_tbl,
155                                      (sch_tbl.c.id == sch_mst_tbl.c.schedulerid))
156 
157             # if we're given a _schedulerid, select only that row
158             wc = None
159             if _schedulerid:
160                 wc = (sch_tbl.c.id == _schedulerid)
161             else:
162                 # otherwise, filter with active, if necessary
163                 if masterid is not None:
164                     wc = (sch_mst_tbl.c.masterid == masterid)
165                 elif active:
166                     wc = (sch_mst_tbl.c.masterid != NULL)
167                 elif active is not None:
168                     wc = (sch_mst_tbl.c.masterid == NULL)
169 
170             q = sa.select([sch_tbl.c.id, sch_tbl.c.name,
171                            sch_mst_tbl.c.masterid],
172                           from_obj=join, whereclause=wc)
173 
174             return [dict(id=row.id, name=row.name,
175                          masterid=row.masterid)
176                     for row in conn.execute(q).fetchall()]
177         return self.db.pool.do(thd)
178
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/master/buildbot/db/schedulers.py b/master/buildbot/db/schedulers.py
--- a/master/buildbot/db/schedulers.py
+++ b/master/buildbot/db/schedulers.py
@@ -30,13 +30,13 @@
 
     def classifyChanges(self, schedulerid, classifications):
         def thd(conn):
-            transaction = conn.begin()
             tbl = self.db.model.scheduler_changes
             ins_q = tbl.insert()
             upd_q = tbl.update(
                 ((tbl.c.schedulerid == schedulerid)
                  & (tbl.c.changeid == sa.bindparam('wc_changeid'))))
             for changeid, important in classifications.items():
+                transaction = conn.begin()
                 # convert the 'important' value into an integer, since that
                 # is the column type
                 imp_int = important and 1 or 0
@@ -54,7 +54,7 @@
                                  wc_changeid=changeid,
                                  important=imp_int)
 
-            transaction.commit()
+                transaction.commit()
         return self.db.pool.do(thd)
 
     def flushChangeClassifications(self, schedulerid, less_than=None):

{"golden_diff": "diff --git a/master/buildbot/db/schedulers.py b/master/buildbot/db/schedulers.py\n--- a/master/buildbot/db/schedulers.py\n+++ b/master/buildbot/db/schedulers.py\n@@ -30,13 +30,13 @@\n \n     def classifyChanges(self, schedulerid, classifications):\n         def thd(conn):\n-            transaction = conn.begin()\n             tbl = self.db.model.scheduler_changes\n             ins_q = tbl.insert()\n             upd_q = tbl.update(\n                 ((tbl.c.schedulerid == schedulerid)\n                  & (tbl.c.changeid == sa.bindparam('wc_changeid'))))\n             for changeid, important in classifications.items():\n+                transaction = conn.begin()\n                 # convert the 'important' value into an integer, since that\n                 # is the column type\n                 imp_int = important and 1 or 0\n@@ -54,7 +54,7 @@\n                                  wc_changeid=changeid,\n                                  important=imp_int)\n \n-            transaction.commit()\n+                transaction.commit()\n         return self.db.pool.do(thd)\n \n     def flushChangeClassifications(self, schedulerid, less_than=None):\n", "issue": "Fix bytes/unicode issue to fix test on Python 3\n\n", "before_files": [{"content": "# This file is part of Buildbot.  Buildbot is free software: you can\n# redistribute it and/or modify it under the terms of the GNU General Public\n# License as published by the Free Software Foundation, version 2.\n#\n# This program is distributed in the hope that it will be useful, but WITHOUT\n# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\n# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more\n# details.\n#\n# You should have received a copy of the GNU General Public License along with\n# this program; if not, write to the Free Software Foundation, Inc., 51\n# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.\n#\n# Copyright Buildbot Team Members\n\nimport sqlalchemy as sa\nimport sqlalchemy.exc\n\nfrom buildbot.db import NULL\nfrom buildbot.db import base\nfrom twisted.internet import defer\n\n\nclass SchedulerAlreadyClaimedError(Exception):\n    pass\n\n\nclass SchedulersConnectorComponent(base.DBConnectorComponent):\n    # Documentation is in developer/db.rst\n\n    def classifyChanges(self, schedulerid, classifications):\n        def thd(conn):\n            transaction = conn.begin()\n            tbl = self.db.model.scheduler_changes\n            ins_q = tbl.insert()\n            upd_q = tbl.update(\n                ((tbl.c.schedulerid == schedulerid)\n                 & (tbl.c.changeid == sa.bindparam('wc_changeid'))))\n            for changeid, important in classifications.items():\n                # convert the 'important' value into an integer, since that\n                # is the column type\n                imp_int = important and 1 or 0\n                try:\n                    conn.execute(ins_q,\n                                 schedulerid=schedulerid,\n                                 changeid=changeid,\n                                 important=imp_int)\n                except (sqlalchemy.exc.ProgrammingError,\n                        sqlalchemy.exc.IntegrityError):\n                    transaction.rollback()\n                    transaction = conn.begin()\n                    # insert failed, so try an update\n                    conn.execute(upd_q,\n                                 wc_changeid=changeid,\n                                 important=imp_int)\n\n            transaction.commit()\n        return self.db.pool.do(thd)\n\n    def flushChangeClassifications(self, schedulerid, less_than=None):\n        def thd(conn):\n            sch_ch_tbl = self.db.model.scheduler_changes\n            wc = (sch_ch_tbl.c.schedulerid == schedulerid)\n            if less_than is not None:\n                wc = wc & (sch_ch_tbl.c.changeid < less_than)\n            q = sch_ch_tbl.delete(whereclause=wc)\n            conn.execute(q)\n        return self.db.pool.do(thd)\n\n    def getChangeClassifications(self, schedulerid, branch=-1,\n                                 repository=-1, project=-1,\n                                 codebase=-1):\n        # -1 here stands for \"argument not given\", since None has meaning\n        # as a branch\n        def thd(conn):\n            sch_ch_tbl = self.db.model.scheduler_changes\n            ch_tbl = self.db.model.changes\n\n            wc = (sch_ch_tbl.c.schedulerid == schedulerid)\n\n            # may need to filter further based on branch, etc\n            extra_wheres = []\n            if branch != -1:\n                extra_wheres.append(ch_tbl.c.branch == branch)\n            if repository != -1:\n                extra_wheres.append(ch_tbl.c.repository == repository)\n            if project != -1:\n                extra_wheres.append(ch_tbl.c.project == project)\n            if codebase != -1:\n                extra_wheres.append(ch_tbl.c.codebase == codebase)\n\n            # if we need to filter further append those, as well as a join\n            # on changeid (but just once for that one)\n            if extra_wheres:\n                wc &= (sch_ch_tbl.c.changeid == ch_tbl.c.changeid)\n                for w in extra_wheres:\n                    wc &= w\n\n            q = sa.select(\n                [sch_ch_tbl.c.changeid, sch_ch_tbl.c.important],\n                whereclause=wc)\n            return dict([(r.changeid, [False, True][r.important])\n                         for r in conn.execute(q)])\n        return self.db.pool.do(thd)\n\n    def findSchedulerId(self, name):\n        tbl = self.db.model.schedulers\n        name_hash = self.hashColumns(name)\n        return self.findSomethingId(\n            tbl=tbl,\n            whereclause=(tbl.c.name_hash == name_hash),\n            insert_values=dict(\n                name=name,\n                name_hash=name_hash,\n            ))\n\n    def setSchedulerMaster(self, schedulerid, masterid):\n        def thd(conn):\n            sch_mst_tbl = self.db.model.scheduler_masters\n\n            # handle the masterid=None case to get it out of the way\n            if masterid is None:\n                q = sch_mst_tbl.delete(\n                    whereclause=(sch_mst_tbl.c.schedulerid == schedulerid))\n                conn.execute(q)\n                return\n\n            # try a blind insert..\n            try:\n                q = sch_mst_tbl.insert()\n                conn.execute(q,\n                             dict(schedulerid=schedulerid, masterid=masterid))\n            except (sa.exc.IntegrityError, sa.exc.ProgrammingError):\n                # someone already owns this scheduler.\n                raise SchedulerAlreadyClaimedError\n\n        return self.db.pool.do(thd)\n\n    @defer.inlineCallbacks\n    def getScheduler(self, schedulerid):\n        sch = yield self.getSchedulers(_schedulerid=schedulerid)\n        if sch:\n            defer.returnValue(sch[0])\n\n    def getSchedulers(self, active=None, masterid=None, _schedulerid=None):\n        def thd(conn):\n            sch_tbl = self.db.model.schedulers\n            sch_mst_tbl = self.db.model.scheduler_masters\n\n            # handle the trivial case of masterid=xx and active=False\n            if masterid is not None and active is not None and not active:\n                return []\n\n            join = sch_tbl.outerjoin(sch_mst_tbl,\n                                     (sch_tbl.c.id == sch_mst_tbl.c.schedulerid))\n\n            # if we're given a _schedulerid, select only that row\n            wc = None\n            if _schedulerid:\n                wc = (sch_tbl.c.id == _schedulerid)\n            else:\n                # otherwise, filter with active, if necessary\n                if masterid is not None:\n                    wc = (sch_mst_tbl.c.masterid == masterid)\n                elif active:\n                    wc = (sch_mst_tbl.c.masterid != NULL)\n                elif active is not None:\n                    wc = (sch_mst_tbl.c.masterid == NULL)\n\n            q = sa.select([sch_tbl.c.id, sch_tbl.c.name,\n                           sch_mst_tbl.c.masterid],\n                          from_obj=join, whereclause=wc)\n\n            return [dict(id=row.id, name=row.name,\n                         masterid=row.masterid)\n                    for row in conn.execute(q).fetchall()]\n        return self.db.pool.do(thd)\n", "path": "master/buildbot/db/schedulers.py"}], "after_files": [{"content": "# This file is part of Buildbot.  Buildbot is free software: you can\n# redistribute it and/or modify it under the terms of the GNU General Public\n# License as published by the Free Software Foundation, version 2.\n#\n# This program is distributed in the hope that it will be useful, but WITHOUT\n# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\n# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more\n# details.\n#\n# You should have received a copy of the GNU General Public License along with\n# this program; if not, write to the Free Software Foundation, Inc., 51\n# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.\n#\n# Copyright Buildbot Team Members\n\nimport sqlalchemy as sa\nimport sqlalchemy.exc\n\nfrom buildbot.db import NULL\nfrom buildbot.db import base\nfrom twisted.internet import defer\n\n\nclass SchedulerAlreadyClaimedError(Exception):\n    pass\n\n\nclass SchedulersConnectorComponent(base.DBConnectorComponent):\n    # Documentation is in developer/db.rst\n\n    def classifyChanges(self, schedulerid, classifications):\n        def thd(conn):\n            tbl = self.db.model.scheduler_changes\n            ins_q = tbl.insert()\n            upd_q = tbl.update(\n                ((tbl.c.schedulerid == schedulerid)\n                 & (tbl.c.changeid == sa.bindparam('wc_changeid'))))\n            for changeid, important in classifications.items():\n                transaction = conn.begin()\n                # convert the 'important' value into an integer, since that\n                # is the column type\n                imp_int = important and 1 or 0\n                try:\n                    conn.execute(ins_q,\n                                 schedulerid=schedulerid,\n                                 changeid=changeid,\n                                 important=imp_int)\n                except (sqlalchemy.exc.ProgrammingError,\n                        sqlalchemy.exc.IntegrityError):\n                    transaction.rollback()\n                    transaction = conn.begin()\n                    # insert failed, so try an update\n                    conn.execute(upd_q,\n                                 wc_changeid=changeid,\n                                 important=imp_int)\n\n                transaction.commit()\n        return self.db.pool.do(thd)\n\n    def flushChangeClassifications(self, schedulerid, less_than=None):\n        def thd(conn):\n            sch_ch_tbl = self.db.model.scheduler_changes\n            wc = (sch_ch_tbl.c.schedulerid == schedulerid)\n            if less_than is not None:\n                wc = wc & (sch_ch_tbl.c.changeid < less_than)\n            q = sch_ch_tbl.delete(whereclause=wc)\n            conn.execute(q)\n        return self.db.pool.do(thd)\n\n    def getChangeClassifications(self, schedulerid, branch=-1,\n                                 repository=-1, project=-1,\n                                 codebase=-1):\n        # -1 here stands for \"argument not given\", since None has meaning\n        # as a branch\n        def thd(conn):\n            sch_ch_tbl = self.db.model.scheduler_changes\n            ch_tbl = self.db.model.changes\n\n            wc = (sch_ch_tbl.c.schedulerid == schedulerid)\n\n            # may need to filter further based on branch, etc\n            extra_wheres = []\n            if branch != -1:\n                extra_wheres.append(ch_tbl.c.branch == branch)\n            if repository != -1:\n                extra_wheres.append(ch_tbl.c.repository == repository)\n            if project != -1:\n                extra_wheres.append(ch_tbl.c.project == project)\n            if codebase != -1:\n                extra_wheres.append(ch_tbl.c.codebase == codebase)\n\n            # if we need to filter further append those, as well as a join\n            # on changeid (but just once for that one)\n            if extra_wheres:\n                wc &= (sch_ch_tbl.c.changeid == ch_tbl.c.changeid)\n                for w in extra_wheres:\n                    wc &= w\n\n            q = sa.select(\n                [sch_ch_tbl.c.changeid, sch_ch_tbl.c.important],\n                whereclause=wc)\n            return dict([(r.changeid, [False, True][r.important])\n                         for r in conn.execute(q)])\n        return self.db.pool.do(thd)\n\n    def findSchedulerId(self, name):\n        tbl = self.db.model.schedulers\n        name_hash = self.hashColumns(name)\n        return self.findSomethingId(\n            tbl=tbl,\n            whereclause=(tbl.c.name_hash == name_hash),\n            insert_values=dict(\n                name=name,\n                name_hash=name_hash,\n            ))\n\n    def setSchedulerMaster(self, schedulerid, masterid):\n        def thd(conn):\n            sch_mst_tbl = self.db.model.scheduler_masters\n\n            # handle the masterid=None case to get it out of the way\n            if masterid is None:\n                q = sch_mst_tbl.delete(\n                    whereclause=(sch_mst_tbl.c.schedulerid == schedulerid))\n                conn.execute(q)\n                return\n\n            # try a blind insert..\n            try:\n                q = sch_mst_tbl.insert()\n                conn.execute(q,\n                             dict(schedulerid=schedulerid, masterid=masterid))\n            except (sa.exc.IntegrityError, sa.exc.ProgrammingError):\n                # someone already owns this scheduler.\n                raise SchedulerAlreadyClaimedError\n\n        return self.db.pool.do(thd)\n\n    @defer.inlineCallbacks\n    def getScheduler(self, schedulerid):\n        sch = yield self.getSchedulers(_schedulerid=schedulerid)\n        if sch:\n            defer.returnValue(sch[0])\n\n    def getSchedulers(self, active=None, masterid=None, _schedulerid=None):\n        def thd(conn):\n            sch_tbl = self.db.model.schedulers\n            sch_mst_tbl = self.db.model.scheduler_masters\n\n            # handle the trivial case of masterid=xx and active=False\n            if masterid is not None and active is not None and not active:\n                return []\n\n            join = sch_tbl.outerjoin(sch_mst_tbl,\n                                     (sch_tbl.c.id == sch_mst_tbl.c.schedulerid))\n\n            # if we're given a _schedulerid, select only that row\n            wc = None\n            if _schedulerid:\n                wc = (sch_tbl.c.id == _schedulerid)\n            else:\n                # otherwise, filter with active, if necessary\n                if masterid is not None:\n                    wc = (sch_mst_tbl.c.masterid == masterid)\n                elif active:\n                    wc = (sch_mst_tbl.c.masterid != NULL)\n                elif active is not None:\n                    wc = (sch_mst_tbl.c.masterid == NULL)\n\n            q = sa.select([sch_tbl.c.id, sch_tbl.c.name,\n                           sch_mst_tbl.c.masterid],\n                          from_obj=join, whereclause=wc)\n\n            return [dict(id=row.id, name=row.name,\n                         masterid=row.masterid)\n                    for row in conn.execute(q).fetchall()]\n        return self.db.pool.do(thd)\n", "path": "master/buildbot/db/schedulers.py"}]}