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from __future__ import absolute_import

from elasticapm import get_client
from elasticapm.traces import execution_context


def structlog_processor(logger, method_name, event_dict):
    """
    Add three new entries to the event_dict for any processed events:

    * transaction.id
    * trace.id
    * span.id

    Only adds non-None IDs.

    :param logger:
        Unused (logger instance in structlog)
    :param method_name:
        Unused (wrapped method_name)
    :param event_dict:
        Event dictionary for the event we're processing
    :return:
        `event_dict`, with three new entries.
    """
    transaction = execution_context.get_transaction()
    if transaction:
        event_dict["transaction.id"] = transaction.id
    client = get_client()
    if client:
        event_dict["service.name"] = client.config.service_name
        event_dict["service.environment"] = client.config.environment
    if transaction and transaction.trace_parent:
        event_dict["trace.id"] = transaction.trace_parent.trace_id
    span = execution_context.get_span()
    if span and span.id:
        event_dict["span.id"] = span.id
    return event_dict
