mirror of https://github.com/jackwener/wx-cli.git
176 lines
6.5 KiB
Python
176 lines
6.5 KiB
Python
"""测量消息延迟 - 用mtime检测WAL变化（WAL文件是预分配固定大小的）"""
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import time, os, sys, io, hashlib, struct, sqlite3, json
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from datetime import datetime
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from Crypto.Cipher import AES
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sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8', errors='replace')
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PAGE_SZ = 4096; KEY_SZ = 32; SALT_SZ = 16; RESERVE_SZ = 80
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SQLITE_HDR = b'SQLite format 3\x00'
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WAL_HEADER_SZ = 32; WAL_FRAME_HEADER_SZ = 24
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from config import load_config
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_cfg = load_config()
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DB_DIR = _cfg["db_dir"]
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KEYS_FILE = _cfg["keys_file"]
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DECRYPTED = os.path.join(_cfg["decrypted_dir"], "session", "session.db")
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with open(KEYS_FILE) as f:
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keys = json.load(f)
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enc_key = bytes.fromhex(keys["session/session.db"]["enc_key"])
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session_db = os.path.join(DB_DIR, "session", "session.db")
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wal_path = session_db + "-wal"
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def decrypt_page(enc_key, page_data, pgno):
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iv = page_data[PAGE_SZ - RESERVE_SZ: PAGE_SZ - RESERVE_SZ + 16]
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if pgno == 1:
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encrypted = page_data[SALT_SZ: PAGE_SZ - RESERVE_SZ]
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cipher = AES.new(enc_key, AES.MODE_CBC, iv)
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decrypted = cipher.decrypt(encrypted)
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return bytearray(SQLITE_HDR + decrypted + b'\x00' * RESERVE_SZ)
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else:
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encrypted = page_data[:PAGE_SZ - RESERVE_SZ]
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cipher = AES.new(enc_key, AES.MODE_CBC, iv)
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decrypted = cipher.decrypt(encrypted)
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return decrypted + b'\x00' * RESERVE_SZ
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def full_decrypt(src, dst):
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t0 = time.perf_counter()
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total = os.path.getsize(src) // PAGE_SZ
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with open(src, 'rb') as fin, open(dst, 'wb') as fout:
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for pgno in range(1, total + 1):
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page = fin.read(PAGE_SZ)
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if len(page) < PAGE_SZ: break
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fout.write(decrypt_page(enc_key, page, pgno))
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return total, (time.perf_counter() - t0) * 1000
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def decrypt_wal_full(wal_path, dst):
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"""解密WAL当前有效frame，patch到dst (校验salt跳过旧周期遗留frame)"""
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t0 = time.perf_counter()
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wal_sz = os.path.getsize(wal_path)
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frame_size = WAL_FRAME_HEADER_SZ + PAGE_SZ
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patched = 0
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with open(wal_path, 'rb') as wf, open(dst, 'r+b') as df:
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wal_hdr = wf.read(WAL_HEADER_SZ)
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wal_salt1 = struct.unpack('>I', wal_hdr[16:20])[0]
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wal_salt2 = struct.unpack('>I', wal_hdr[20:24])[0]
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while wf.tell() + frame_size <= wal_sz:
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fh = wf.read(WAL_FRAME_HEADER_SZ)
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if len(fh) < WAL_FRAME_HEADER_SZ: break
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pgno = struct.unpack('>I', fh[0:4])[0]
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frame_salt1 = struct.unpack('>I', fh[8:12])[0]
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frame_salt2 = struct.unpack('>I', fh[12:16])[0]
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ep = wf.read(PAGE_SZ)
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if len(ep) < PAGE_SZ: break
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if pgno == 0 or pgno > 1000000: continue
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if frame_salt1 != wal_salt1 or frame_salt2 != wal_salt2: continue
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dec = decrypt_page(enc_key, ep, pgno)
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df.seek((pgno - 1) * PAGE_SZ)
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df.write(dec)
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patched += 1
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return patched, (time.perf_counter() - t0) * 1000
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# 初始化: 全量解密
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print("初始全量解密...", flush=True)
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pages, ms = full_decrypt(session_db, DECRYPTED)
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print(f" DB: {pages}页 {ms:.0f}ms", flush=True)
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if os.path.exists(wal_path):
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patched, ms2 = decrypt_wal_full(wal_path, DECRYPTED)
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print(f" WAL: {patched}页 {ms2:.0f}ms", flush=True)
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# 获取初始状态
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conn = sqlite3.connect(DECRYPTED)
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prev_sessions = {}
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for r in conn.execute("SELECT username, last_timestamp FROM SessionTable WHERE last_timestamp>0"):
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prev_sessions[r[0]] = r[1]
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conn.close()
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# 记录初始mtime
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prev_wal_mtime = os.path.getmtime(wal_path) if os.path.exists(wal_path) else 0
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prev_db_mtime = os.path.getmtime(session_db)
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wal_sz = os.path.getsize(wal_path) if os.path.exists(wal_path) else 0
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print(f"\nWAL大小: {wal_sz} bytes (固定预分配)", flush=True)
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print(f"跟踪 {len(prev_sessions)} 个会话", flush=True)
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print(f"\n等待微信新消息... (60秒超时, 30ms轮询)\n", flush=True)
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start = time.time()
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while time.time() - start < 60:
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time.sleep(0.03)
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# 用mtime检测变化
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try:
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wal_mtime = os.path.getmtime(wal_path) if os.path.exists(wal_path) else 0
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db_mtime = os.path.getmtime(session_db)
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except:
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continue
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if wal_mtime == prev_wal_mtime and db_mtime == prev_db_mtime:
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continue
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t_detect = time.perf_counter()
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detect_str = datetime.now().strftime('%H:%M:%S.%f')[:-3]
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wal_changed = wal_mtime != prev_wal_mtime
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db_changed = db_mtime != prev_db_mtime
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print(f"[{detect_str}] 变化检测: WAL={'变' if wal_changed else '不变'} DB={'变' if db_changed else '不变'}", flush=True)
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# 如果DB变了(checkpoint), 全量重解密
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if db_changed and not wal_changed:
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pages, ms = full_decrypt(session_db, DECRYPTED)
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print(f" 全量解密: {pages}页 {ms:.0f}ms", flush=True)
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else:
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# WAL变了, 重新patch所有WAL frame (因为不知道哪些是新的)
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# 先全量解密DB基础
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pages, ms = full_decrypt(session_db, DECRYPTED)
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patched, ms2 = decrypt_wal_full(wal_path, DECRYPTED)
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print(f" DB {pages}页/{ms:.0f}ms + WAL {patched}页/{ms2:.0f}ms", flush=True)
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t_decrypt = time.perf_counter()
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# 查询变化
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conn = sqlite3.connect(DECRYPTED)
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new_msgs = []
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for r in conn.execute("""
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SELECT username, last_timestamp, summary, last_sender_display_name
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FROM SessionTable WHERE last_timestamp > 0
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"""):
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uname, ts, summary, sender = r
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if ts > prev_sessions.get(uname, 0):
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delay = time.time() - ts
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new_msgs.append((uname, ts, summary or '', sender or '', delay))
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prev_sessions[uname] = ts
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conn.close()
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t_query = time.perf_counter()
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decrypt_ms = (t_decrypt - t_detect) * 1000
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query_ms = (t_query - t_decrypt) * 1000
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total_ms = (t_query - t_detect) * 1000
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print(f" 处理总耗时: {total_ms:.1f}ms (解密{decrypt_ms:.1f}ms + 查询{query_ms:.1f}ms)", flush=True)
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for uname, ts, summary, sender, delay in sorted(new_msgs, key=lambda x: x[1]):
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if ':\n' in summary:
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summary = summary.split(':\n', 1)[1]
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msg_time = datetime.fromtimestamp(ts).strftime('%H:%M:%S')
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print(f" >>> 消息时间={msg_time} | 微信→DB延迟={delay:.1f}s | {sender}: {summary}", flush=True)
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if not new_msgs:
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print(f" (无新消息变化)", flush=True)
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prev_wal_mtime = wal_mtime
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prev_db_mtime = db_mtime
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print(flush=True)
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print("超时退出", flush=True)
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