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from elasticapm.contrib.asyncio.traces import async_capture_span
from elasticapm.instrumentation.packages.asyncio.base import AsyncAbstractInstrumentedModule
from elasticapm.instrumentation.packages.dbapi2 import extract_signature
from elasticapm.utils.encoding import shorten


class AioMySQLInstrumentation(AsyncAbstractInstrumentedModule):
    name = "aiomysql"

    instrument_list = [("aiomysql.cursors", "Cursor.execute")]

    async def call(self, module, method, wrapped, instance, args, kwargs):
        if method == "Cursor.execute":
            query = args[0]
            name = extract_signature(query)

            # Truncate sql_string to 10000 characters to prevent large queries from
            # causing an error to APM server.
            query = shorten(query, string_length=10000)

            context = {
                "db": {"type": "sql", "statement": query},
                "destination": {
                    "address": instance.connection.host,
                    "port": instance.connection.port,
                    "service": {"name": "", "resource": "mysql", "type": ""},
                },
            }
            action = "query"
        else:
            raise AssertionError("call from uninstrumented method")

        async with async_capture_span(
            name, leaf=True, span_type="db", span_subtype="mysql", span_action=action, extra=context
        ):
            return await wrapped(*args, **kwargs)