# borrowed from XMLTV importer
#
# One can simply use
# import log
# print("Some text", file=log)
# because the log unit looks enough like a file!

from __future__ import absolute_import

import sys
import threading
try:
    from cStringIO import StringIO
except:
    from io import StringIO

logfile = StringIO()
# Need to make our operations thread-safe.
mutex = threading.Lock()


def write(data):
    mutex.acquire()
    try:
        if logfile.tell() > 8000:
            # Do a sort of 8k round robin
            logfile.seek(0, 0)
        logfile.write(data)
    finally:
        mutex.release()
    sys.stdout.write(data)


def getvalue():
    mutex.acquire()
    try:
        pos = logfile.tell()
        head = logfile.read()
        logfile.seek(0, 0)
        tail = logfile.read(pos)
    finally:
        mutex.release()
    return head + tail