django-orchestra/orchestra/contrib/databases/backends.py

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import textwrap
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from django.utils.translation import ugettext_lazy as _
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from orchestra.contrib.orchestration import ServiceController, replace
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from orchestra.contrib.resources import ServiceMonitor
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from . import settings
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class MySQLBackend(ServiceController):
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"""
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Simple backend for creating MySQL databases using <tt>CREATE DATABASE</tt> statement.
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"""
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verbose_name = "MySQL database"
model = 'databases.Database'
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default_route_match = "database.type == 'mysql'"
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doc_settings = (settings,
('DATABASES_DEFAULT_HOST',)
)
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def save(self, database):
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if database.type != database.MYSQL:
return
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context = self.get_context(database)
self.append(
"mysql -e 'CREATE DATABASE `%(database)s`;' || true" % context
)
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# Not available on delete()
context['owner'] = database.owner
# clean previous privileges
self.append("""mysql mysql -e 'DELETE FROM db WHERE db = "%(database)s";'""" % context)
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for user in database.users.all():
context.update({
'username': user.username,
'grant': 'WITH GRANT OPTION' if user == context['owner'] else ''
})
self.append(textwrap.dedent("""\
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mysql -e 'GRANT ALL PRIVILEGES ON `%(database)s`.* TO "%(username)s"@"%(host)s" %(grant)s;' \
""") % context
)
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def delete(self, database):
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if database.type != database.MYSQL:
return
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context = self.get_context(database)
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self.append("mysql -e 'DROP DATABASE `%(database)s`;' || exit_code=$?" % context)
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self.append("mysql mysql -e 'DELETE FROM db WHERE db = \"%(database)s\";'" % context)
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def commit(self):
self.append("mysql -e 'FLUSH PRIVILEGES;'")
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super(MySQLBackend, self).commit()
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def get_context(self, database):
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context = {
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'database': database.name,
'host': settings.DATABASES_DEFAULT_HOST,
}
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return replace(replace(context, "'", '"'), ';', '')
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class MySQLUserBackend(ServiceController):
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"""
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Simple backend for creating MySQL users using <tt>CREATE USER</tt> statement.
"""
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verbose_name = "MySQL user"
model = 'databases.DatabaseUser'
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default_route_match = "databaseuser.type == 'mysql'"
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doc_settings = (settings,
('DATABASES_DEFAULT_HOST',)
)
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def save(self, user):
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if user.type != user.MYSQL:
return
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context = self.get_context(user)
self.append(textwrap.dedent("""\
mysql -e 'CREATE USER "%(username)s"@"%(host)s";' || true \
""") % context
)
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self.append(textwrap.dedent("""\
mysql -e 'UPDATE mysql.user SET Password="%(password)s" WHERE User="%(username)s";' \
""") % context
)
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def delete(self, user):
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if user.type != user.MYSQL:
return
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context = self.get_context(user)
self.append(textwrap.dedent("""\
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mysql -e 'DROP USER "%(username)s"@"%(host)s";' || exit_code=$? \
""") % context
)
def commit(self):
self.append("mysql -e 'FLUSH PRIVILEGES;'")
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def get_context(self, user):
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context = {
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'username': user.username,
'password': user.password,
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'host': settings.DATABASES_DEFAULT_HOST,
}
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return replace(replace(context, "'", '"'), ';', '')
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class MysqlDisk(ServiceMonitor):
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"""
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<tt>du -bs &lt;database_path&gt;</tt>
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Implements triggers for resource limit exceeded and recovery, disabling insert and create privileges.
"""
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model = 'databases.Database'
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verbose_name = _("MySQL disk")
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def exceeded(self, db):
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if db.type != db.MYSQL:
return
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context = self.get_context(db)
self.append(textwrap.dedent("""\
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mysql -e 'UPDATE db SET Insert_priv="N", Create_priv="N" WHERE Db="%(db_name)s";'\
""") % context
)
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def recovery(self, db):
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if db.type != db.MYSQL:
return
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context = self.get_context(db)
self.append(textwrap.dedent("""\
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mysql -e 'UPDATE db SET Insert_priv="Y", Create_priv="Y" WHERE Db="%(db_name)s";'\
""") % context
)
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def prepare(self):
super(MysqlDisk, self).prepare()
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self.append(textwrap.dedent("""\
function monitor () {
{ du -bs "/var/lib/mysql/$1" || echo 0; } | awk {'print $1'}
}"""))
# Slower way
#self.append(textwrap.dedent("""\
# function monitor () {
# mysql -B -e "
# SELECT IFNULL(sum(data_length + index_length), 0) 'Size'
# FROM information_schema.TABLES
# WHERE table_schema = '$1';
# " | tail -n 1
# }"""))
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def monitor(self, db):
if db.type != db.MYSQL:
return
context = self.get_context(db)
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self.append('echo %(db_id)s $(monitor "%(db_dirname)s")' % context)
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def get_context(self, db):
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context = {
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'db_name': db.name,
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'db_dirname': db.name.replace('-', '@003f'),
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'db_id': db.pk,
}
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return replace(replace(context, "'", '"'), ';', '')