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sql.py
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sql.py
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import uuid
from copy import copy
from django.db.backends import BaseDatabaseWrapper
from django.utils.translation import ugettext_lazy as _, ungettext_lazy as __
from debug_toolbar.forms import SQLSelectForm
from debug_toolbar.utils.compat.db import connections
from debug_toolbar.middleware import DebugToolbarMiddleware
from debug_toolbar.panels import DebugPanel
from debug_toolbar.utils import render_stacktrace
from debug_toolbar.utils.sql import reformat_sql
from debug_toolbar.utils.tracking.db import CursorWrapper
from debug_toolbar.utils.tracking import replace_call
# Inject our tracking cursor
@replace_call(BaseDatabaseWrapper.cursor)
def cursor(func, self):
result = func(self)
djdt = DebugToolbarMiddleware.get_current()
if not djdt:
return result
logger = djdt.get_panel(SQLDebugPanel)
return CursorWrapper(result, self, logger=logger)
def get_isolation_level_display(engine, level):
if engine == 'psycopg2':
import psycopg2.extensions
choices = {
psycopg2.extensions.ISOLATION_LEVEL_AUTOCOMMIT: _('Autocommit'),
psycopg2.extensions.ISOLATION_LEVEL_READ_UNCOMMITTED: _('Read uncommitted'),
psycopg2.extensions.ISOLATION_LEVEL_READ_COMMITTED: _('Read committed'),
psycopg2.extensions.ISOLATION_LEVEL_REPEATABLE_READ: _('Repeatable read'),
psycopg2.extensions.ISOLATION_LEVEL_SERIALIZABLE: _('Serializable'),
}
else:
raise ValueError(engine)
return choices.get(level)
def get_transaction_status_display(engine, level):
if engine == 'psycopg2':
import psycopg2.extensions
choices = {
psycopg2.extensions.TRANSACTION_STATUS_IDLE: _('Idle'),
psycopg2.extensions.TRANSACTION_STATUS_ACTIVE: _('Active'),
psycopg2.extensions.TRANSACTION_STATUS_INTRANS: _('In transaction'),
psycopg2.extensions.TRANSACTION_STATUS_INERROR: _('In error'),
psycopg2.extensions.TRANSACTION_STATUS_UNKNOWN: _('Unknown'),
}
else:
raise ValueError(engine)
return choices.get(level)
class SQLDebugPanel(DebugPanel):
"""
Panel that displays information about the SQL queries run while processing
the request.
"""
name = 'SQL'
template = 'debug_toolbar/panels/sql.html'
has_content = True
def __init__(self, *args, **kwargs):
super(SQLDebugPanel, self).__init__(*args, **kwargs)
self._offset = dict((k, len(connections[k].queries)) for k in connections)
self._sql_time = 0
self._num_queries = 0
self._queries = []
self._databases = {}
self._transaction_status = {}
self._transaction_ids = {}
def get_transaction_id(self, alias):
if alias not in connections:
return
conn = connections[alias].connection
if not conn:
return
engine = conn.__class__.__module__.split('.', 1)[0]
if engine == 'psycopg2':
cur_status = conn.get_transaction_status()
else:
raise ValueError(engine)
last_status = self._transaction_status.get(alias)
self._transaction_status[alias] = cur_status
if not cur_status:
# No available state
return None
if cur_status != last_status:
if cur_status:
self._transaction_ids[alias] = uuid.uuid4().hex
else:
self._transaction_ids[alias] = None
return self._transaction_ids[alias]
def record(self, alias, **kwargs):
self._queries.append((alias, kwargs))
if alias not in self._databases:
self._databases[alias] = {
'time_spent': kwargs['duration'],
'num_queries': 1,
}
else:
self._databases[alias]['time_spent'] += kwargs['duration']
self._databases[alias]['num_queries'] += 1
self._sql_time += kwargs['duration']
self._num_queries += 1
def nav_title(self):
return _('SQL')
def nav_subtitle(self):
return __("%d query in %.2fms", "%d queries in %.2fms",
self._num_queries) % (self._num_queries, self._sql_time)
def title(self):
count = len(self._databases)
return __('SQL Queries from %(count)d connection',
'SQL Queries from %(count)d connections',
count) % dict(count=count)
def url(self):
return ''
def process_response(self, request, response):
if self._queries:
width_ratio_tally = 0
factor = int(256.0 / (len(self._databases) * 2.5))
for n, db in enumerate(self._databases.itervalues()):
rgb = [0, 0, 0]
color = n % 3
rgb[color] = 256 - n / 3 * factor
nn = color
# XXX: pretty sure this is horrible after so many aliases
while rgb[color] < factor:
nc = min(256 - rgb[color], 256)
rgb[color] += nc
nn += 1
if nn > 2:
nn = 0
rgb[nn] = nc
db['rgb_color'] = rgb
trans_ids = {}
trans_id = None
i = 0
for alias, query in self._queries:
trans_id = query.get('trans_id')
last_trans_id = trans_ids.get(alias)
if trans_id != last_trans_id:
if last_trans_id:
self._queries[(i - 1)][1]['ends_trans'] = True
trans_ids[alias] = trans_id
if trans_id:
query['starts_trans'] = True
if trans_id:
query['in_trans'] = True
query['alias'] = alias
if 'iso_level' in query:
query['iso_level'] = get_isolation_level_display(query['engine'], query['iso_level'])
if 'trans_status' in query:
query['trans_status'] = get_transaction_status_display(query['engine'], query['trans_status'])
query['form'] = SQLSelectForm(auto_id=None, initial=copy(query))
if query['sql']:
query['sql'] = reformat_sql(query['sql'])
query['rgb_color'] = self._databases[alias]['rgb_color']
try:
query['width_ratio'] = (query['duration'] / self._sql_time) * 100
query['width_ratio_relative'] = 100.0 * query['width_ratio'] / (100.0 - width_ratio_tally)
except ZeroDivisionError:
query['width_ratio'] = 0
query['width_ratio_relative'] = 0
query['start_offset'] = width_ratio_tally
query['end_offset'] = query['width_ratio'] + query['start_offset']
width_ratio_tally += query['width_ratio']
query['stacktrace'] = render_stacktrace(query['stacktrace'])
i += 1
if trans_id:
self._queries[(i - 1)][1]['ends_trans'] = True
self.record_stats({
'databases': sorted(self._databases.items(), key=lambda x: -x[1]['time_spent']),
'queries': [q for a, q in self._queries],
'sql_time': self._sql_time,
})