演示如何使用logger输出结构化的日志，并且保留RequestId

index.py

# -*- coding: utf-8 -*-
import json
import os
import logging
import re

# 演示如何使用logger输出结构化的日志，并且保留RequestId
# Sample output
# FunctionCompute python3 runtime inited.
# FC Invoke Start RequestId: a567f45b-cf83-4436-96a5-bafad61e1c28
# {"time":"2019-11-08 18:35:12,170.170Z", "requestId": "a567f45b-cf83-4436-96a5-bafad61e1c28", "level": "INFO", "detail": "{"message": "message 1", "foo": "bar", "bar": "baz", "num": 123, "fnum": 123.456}"}
# nullFC Invoke End RequestId: a567f45b-cf83-4436-96a5-bafad61e1c28

class StructuredMessage(object):
    def __init__(self, message, **kwargs):
        self.message = message
        self.kwargs = kwargs

    def __str__(self):
        kv = {}
        kv['message'] = self.message
        kv.update(self.kwargs)
        return json.dumps(kv)

_ = StructuredMessage   # optional, to improve readability

logger = logging.getLogger()
lh = logger.handlers.pop()
lh.setFormatter(logging.Formatter(
    '{"time":"%(asctime)s.%(msecs)03dZ", "requestId": "%(fc_request_id)s", "level": "%(levelname)s", "detail": %(message)s}', '%Y-%m-%dT%H:%M:%S'))
logger.addHandler(lh)


def handler(event, context):
    logging.info(_('message 1', foo='bar', bar='baz', num=123, fnum=123.456))