65 lines
2.0 KiB
Python
65 lines
2.0 KiB
Python
#!/usr/bin/env python2
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# -*- coding: UTF-8 -*-
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# File: avatar.py
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# Date: Thu Jun 18 00:02:07 2015 +0800
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# Author: Yuxin Wu <[email protected]>
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from PIL import Image
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import cStringIO
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import os
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import numpy as np
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import logging
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import sqlite3
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logger = logging.getLogger(__name__)
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from common.textutil import ensure_bin_str, md5
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class AvatarReader(object):
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def __init__(self, avt_dir, avt_db="avatar.index"):
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self.avt_dir = avt_dir
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self.avt_db = avt_db
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def get_avatar(self, username):
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""" username: `username` field in db.rcontact"""
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username = ensure_bin_str(username)
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filename = md5(username)
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dir1, dir2 = filename[:2], filename[2:4]
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filename = os.path.join(dir1, dir2,
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"user_{}.png".format(filename))
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try:
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try:
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pos, size = self.query_index(filename)
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return self.read_img(pos, size)
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except TypeError:
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logger.warn("Avatar for {} not found in avatar database.".format(username))
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return None
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except Exception as e:
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raise
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print e
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logger.warn("Failed to retrieve avatar!")
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return None
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def read_img(self, pos, size):
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file_idx = pos >> 32
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fname = os.path.join(self.avt_dir,
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'avatar.block.' + '{:05d}'.format(file_idx))
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# a 64-byte offset of each block file
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start_pos = pos - file_idx * (2**32) + 64
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try:
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with open(fname, 'rb') as f:
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f.seek(start_pos)
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data = f.read(size)
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im = Image.open(cStringIO.StringIO(data))
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return im
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except IOError as e:
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logger.warn("Cannot read avatar from {}: {}".format(fname, str(e)))
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return None
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def query_index(self, filename):
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conn = sqlite3.connect(self.avt_db)
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cursor = conn.execute("select Offset,Size from Index_avatar where FileName='{}'".format(filename))
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pos, size = cursor.fetchone()
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return pos, size
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