(cls, fields, query=None)
| 98 | |
| 99 | @classmethod |
| 100 | def _make_constructor(cls, fields, query=None): |
| 101 | dct = cls._get_error_dict(fields, query) |
| 102 | |
| 103 | exccls = cls._get_error_class(fields) |
| 104 | message = dct.get('message', '') |
| 105 | |
| 106 | # PostgreSQL will raise an exception when it detects |
| 107 | # that the result type of the query has changed from |
| 108 | # when the statement was prepared. |
| 109 | # |
| 110 | # The original error is somewhat cryptic and unspecific, |
| 111 | # so we raise a custom subclass that is easier to handle |
| 112 | # and identify. |
| 113 | # |
| 114 | # Note that we specifically do not rely on the error |
| 115 | # message, as it is localizable. |
| 116 | is_icse = ( |
| 117 | exccls.__name__ == 'FeatureNotSupportedError' and |
| 118 | _is_asyncpg_class(exccls) and |
| 119 | dct.get('server_source_function') == 'RevalidateCachedQuery' |
| 120 | ) |
| 121 | |
| 122 | if is_icse: |
| 123 | exceptions = sys.modules[exccls.__module__] |
| 124 | exccls = exceptions.InvalidCachedStatementError |
| 125 | message = ('cached statement plan is invalid due to a database ' |
| 126 | 'schema or configuration change') |
| 127 | |
| 128 | is_prepared_stmt_error = ( |
| 129 | exccls.__name__ in ('DuplicatePreparedStatementError', |
| 130 | 'InvalidSQLStatementNameError') and |
| 131 | _is_asyncpg_class(exccls) |
| 132 | ) |
| 133 | |
| 134 | if is_prepared_stmt_error: |
| 135 | hint = dct.get('hint', '') |
| 136 | hint += textwrap.dedent("""\ |
| 137 | |
| 138 | NOTE: pgbouncer with pool_mode set to "transaction" or |
| 139 | "statement" does not support prepared statements properly. |
| 140 | You have two options: |
| 141 | |
| 142 | * if you are using pgbouncer for connection pooling to a |
| 143 | single server, switch to the connection pool functionality |
| 144 | provided by asyncpg, it is a much better option for this |
| 145 | purpose; |
| 146 | |
| 147 | * if you have no option of avoiding the use of pgbouncer, |
| 148 | then you can set statement_cache_size to 0 when creating |
| 149 | the asyncpg connection object. |
| 150 | """) |
| 151 | |
| 152 | dct['hint'] = hint |
| 153 | |
| 154 | return exccls, message, dct |
| 155 | |
| 156 | def as_dict(self): |
| 157 | dct = {} |
no test coverage detected