requirements -> Jinja2

json-log.py

#!/usr/bin/env python
import os
import sys
import json
import argparse

from jinja2 import Environment, FileSystemLoader

template = '[{{timestamp}}] {{fields.level}} {{message}}'
t = Environment().from_string(template)

parser = argparse.ArgumentParser()
parser.add_argument("--filter", help="--filter @fields.level=ERROR")
parser.add_argument("--format", help="--format template.j2 ")
args = parser.parse_args()

if args.filter:
    f = args.filter.split('=')
    keys = f[0].split('.')
    print(keys)


if args.format:
    try:
        THIS_DIR = os.path.dirname(os.path.abspath(__file__))
        j2_env = Environment(loader=FileSystemLoader(THIS_DIR))
        t = j2_env.get_template(args.format)
    except:
        print("Template Not Found, Install deafult template")

try:
    while True:
        json_string = sys.stdin.readline()

        if not json_string:
            continue

        parser_string = json.loads(json_string)

        if args.filter:
            if len(keys)==1:
                if parser_string[keys[0]]!=f[1]:
                    continue
            else:
                if parser_string[keys[0]][keys[1]]!=f[1]:
                    continue

        for k, v in parser_string.items():
            if k.startswith('@'):
                parser_string[k[1::]] = parser_string.pop(k)

        print(t.render(**parser_string))

except KeyboardInterrupt:
    print('It is ALL')
    exit(0)