def install_async()

in skywalking/plugins/sw_psycopg.py [0:0]
81 lines of code
15 McCabe index (conditional complexity)

def install_async():
    import wrapt  # psycopg is read-only C extension objects so they need to be proxied
    import psycopg

    class ProxyAsyncCursor(wrapt.ObjectProxy):
        def __init__(self, cur):
            wrapt.ObjectProxy.__init__(self, cur)

            self._self_cur = cur

        async def __aenter__(self):
            return self  # return ProxyAsyncCursor(await self._self_cur.__aenter__())  # may be necessary in future version of psycopg if __aenter__() does not return self

        async def __aexit__(self, exc_type, exc_val, exc_tb):
            return await self._self_cur.__aexit__(exc_type, exc_val, exc_tb)

        async def execute(self, query, vars=None, *args, **kwargs):
            dsn = self.connection.info.get_parameters()
            port = self.connection.info.port
            peer = f"{dsn['host']}:{str(port)}"

            with get_context().new_exit_span(op='PostgreSQL/Psycopg/execute', peer=peer,
                                             component=Component.Psycopg) as span:
                span.layer = Layer.Database

                span.tag(TagDbType('PostgreSQL'))
                span.tag(TagDbInstance(dsn['dbname']))
                span.tag(TagDbStatement(query))

                if config.plugin_sql_parameters_max_length and vars is not None:
                    text = ','.join(str(v) for v in vars)

                    if len(text) > config.plugin_sql_parameters_max_length:
                        text = f'{text[:config.plugin_sql_parameters_max_length]}...'

                    span.tag(TagDbSqlParameters(f'[{text}]'))

                return await self._self_cur.execute(query, vars, *args, **kwargs)

        async def executemany(self, query, vars_list, *args, **kwargs):
            dsn = self.connection.info.get_parameters()
            port = self.connection.info.port
            peer = f"{dsn['host']}:{str(port)}"

            with get_context().new_exit_span(op='PostgreSQL/Psycopg/executemany', peer=peer,
                                             component=Component.Psycopg) as span:
                span.layer = Layer.Database

                span.tag(TagDbType('PostgreSQL'))
                span.tag(TagDbInstance(dsn['dbname']))
                span.tag(TagDbStatement(query))

                if config.plugin_sql_parameters_max_length:
                    max_len = config.plugin_sql_parameters_max_length
                    total_len = 0
                    text_list = []

                    for vars in vars_list:
                        text = f"[{','.join(str(v) for v in vars)}]"
                        total_len += len(text)

                        if total_len > max_len:
                            text_list.append(f'{text[:max_len - total_len]}...')

                            break

                        text_list.append(text)

                    span.tag(TagDbSqlParameters(f"[{','.join(text_list)}]"))

                return await self._self_cur.executemany(query, vars_list, *args, **kwargs)

        async def stream(self, query, vars=None, *args, **kwargs):
            dsn = self.connection.info.get_parameters()
            port = self.connection.info.port
            peer = f"{dsn['host']}:{str(port)}"

            with get_context().new_exit_span(op='PostgreSQL/Psycopg/stream', peer=peer,
                                             component=Component.Psycopg) as span:
                span.layer = Layer.Database

                span.tag(TagDbType('PostgreSQL'))
                span.tag(TagDbInstance(dsn['dbname']))
                span.tag(TagDbStatement(query))

                if config.plugin_sql_parameters_max_length and vars is not None:
                    text = ','.join(str(v) for v in vars)

                    if len(text) > config.plugin_sql_parameters_max_length:
                        text = f'{text[:config.plugin_sql_parameters_max_length]}...'

                    span.tag(TagDbSqlParameters(f'[{text}]'))

                async for r in self._self_cur.stream(query, vars, *args, **kwargs):
                    yield r

    class ProxyAsyncConnection(wrapt.ObjectProxy):
        def __init__(self, conn):
            wrapt.ObjectProxy.__init__(self, conn)

            self._self_conn = conn

        async def __aenter__(self):
            return self  # return ProxyAsyncConnection(await self._self_conn.__aenter__())  # may be necessary in future version of psycopg if __aenter__() does not return self

        async def __aexit__(self, exc_type, exc_val, exc_tb):
            return await self._self_conn.__aexit__(exc_type, exc_val, exc_tb)

        def cursor(self, *args, **kwargs):
            return ProxyAsyncCursor(self._self_conn.cursor(*args, **kwargs))

    async def aconnect(*args, **kwargs):
        return ProxyAsyncConnection(await _aconnect(*args, **kwargs))

    _aconnect = psycopg.AsyncConnection.connect
    psycopg.AsyncConnection.connect = aconnect