parse.py

import sys # stdin
import re # regexp
import os
import json

qsize = 20;
filename = "chat.json"

smsg = re.compile(r"\[(\d{2}:\d{2}:\d{2})\] \[Server thread/INFO\]: (.*)")
chat = re.compile(r"<(.*)> (.*)")
achi = re.compile(r"(.*) has just earned the achievement \[(.*)\]")
died = re.compile(r"([^ ]*) ((blew|burned|died|drowned|fell|got|hit|tried|starved|suffocated|walked|was|went|withered).*)")

storage = list()

def put(a,t,n,m):
	if(len(storage) > qsize):
		storage.pop(0)
	storage.append({'action':a,'timestamp':t,'nick':n,'message':m})

def writeJSON():
	f = open(filename+".new", 'w+')
	js = json.dumps(storage)
	f.write(js)
	f.flush()
	f.close()
	# This way the webserver will always
	# serve "complete" json
	os.rename(filename+".new", filename)

while True:
	line = sys.stdin.readline()
	line=line.strip()
	sm = re.match(smsg, line)
	if (sm):
		time = sm.group(1)
		data = sm.group(2)
		cl = re.match(chat, data);
		if(cl):
			# action, timestamp, nick, message
			put("said", time, cl.group(1), cl.group(2))
			writeJSON()
			continue;
		ac = re.match(achi, data);
		if(ac):
			put("gained", time, ac.group(1), ac.group(2))
			writeJSON()
			continue;
		di = re.match(died, data)
		if(di):
			put("died", time, di.group(1), di.group(2));
			writeJSON()
			continue;