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from __future__ import absolute_import, unicode_literals
import uuid
from collections import defaultdict
from copy import copy
from django.conf.urls import url
from django.db import connections
from django.utils.translation import ugettext_lazy as _, ungettext_lazy as __
from debug_toolbar.panels import Panel
from debug_toolbar.panels.sql import views
from debug_toolbar.panels.sql.forms import SQLSelectForm
from debug_toolbar.panels.sql.tracking import unwrap_cursor, wrap_cursor
from debug_toolbar.panels.sql.utils import (
contrasting_color_generator, reformat_sql,
)
from debug_toolbar.utils import render_stacktrace
def get_isolation_level_display(vendor, level):
if vendor == 'postgresql':
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(vendor)
return choices.get(level)
def get_transaction_status_display(vendor, level):
if vendor == 'postgresql':
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(vendor)
return choices.get(level)
class SQLPanel(Panel):
"""
Panel that displays information about the SQL queries run while processing
the request.
"""
def __init__(self, *args, **kwargs):
super(SQLPanel, 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
if conn.vendor == 'postgresql':
cur_status = conn.get_transaction_status()
else:
raise ValueError(conn.vendor)
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
# Implement the Panel API
nav_title = _("SQL")
@property
def nav_subtitle(self):
return __("%d query in %.2fms", "%d queries in %.2fms",
self._num_queries) % (self._num_queries, self._sql_time)
@property
def title(self):
count = len(self._databases)
return __('SQL queries from %(count)d connection',
'SQL queries from %(count)d connections',
count) % {'count': count}
template = 'debug_toolbar/panels/sql.html'
@classmethod
def get_urls(cls):
return [
url(r'^sql_select/$', views.sql_select, name='sql_select'),
url(r'^sql_explain/$', views.sql_explain, name='sql_explain'),
url(r'^sql_profile/$', views.sql_profile, name='sql_profile'),
]
def enable_instrumentation(self):
# This is thread-safe because database connections are thread-local.
for connection in connections.all():
wrap_cursor(connection, self)
def disable_instrumentation(self):
for connection in connections.all():
unwrap_cursor(connection)
def generate_stats(self, request, response):
colors = contrasting_color_generator()
trace_colors = defaultdict(lambda: next(colors))
query_duplicates = defaultdict(lambda: defaultdict(int))
if self._queries:
width_ratio_tally = 0
factor = int(256.0 / (len(self._databases) * 2.5))
for n, db in enumerate(self._databases.values()):
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:
query_duplicates[alias][query["raw_sql"]] += 1
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['vendor'],
query['iso_level'])
if 'trans_status' in query:
query['trans_status'] = get_transaction_status_display(query['vendor'],
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
query['trace_color'] = trace_colors[query['stacktrace']]
if trans_id:
self._queries[(i - 1)][1]['ends_trans'] = True
# Queries are duplicates only if there's as least 2 of them.
# Also, to hide queries, we need to give all the duplicate groups an id
query_colors = contrasting_color_generator()
query_duplicates = dict(
(alias, dict(
(query, (duplicate_count, next(query_colors)))
for query, duplicate_count in queries.items()
if duplicate_count >= 2
))
for alias, queries in query_duplicates.items()
)
for alias, query in self._queries:
try:
duplicates_count, color = query_duplicates[alias][query["raw_sql"]]
query["duplicate_count"] = duplicates_count
query["duplicate_color"] = color
except KeyError:
pass
for alias, alias_info in self._databases.items():
try:
alias_info["duplicate_count"] = sum(e[0] for e in query_duplicates[alias].values())
except KeyError:
pass
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,
})
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