310 lines
10 KiB
Python
310 lines
10 KiB
Python
"""
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TAF/WUP 帧解码器 — 将二进制帧转为可读摘要，用于日志输出
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"""
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from .taf_protocol import TafInputStream, TafType
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from .wup_protocol import normalize_wup_payload
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# cmd 编号 → 名称
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CMD_NAMES = {
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0x03: "RPC_REQ", 0x04: "RPC_RSP", 0x0a: "AUTH",
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0x0b: "PUSH1", 0x10: "HB_SEND", 0x11: "HB_RECV",
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0x17: "CONFIRM", 0x18: "PUSH2", 0x21: "REGISTER", 0x22: "CONFIRM_RSP",
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}
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# TAIL_BYTES = 2c36004c5c6600
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_TAIL = bytes.fromhex("2c36004c5c6600")
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def _strip_tail(body: bytes) -> bytes:
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"""裁掉 body 末尾的 TAIL_BYTES"""
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if body.endswith(_TAIL):
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return body[:-len(_TAIL)]
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# 有时 TAIL 前还有 0c (ZERO tag)
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if len(body) > 1 and body[-len(_TAIL)-1:-len(_TAIL)] == b'\x0c' and body.endswith(_TAIL):
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return body[:-len(_TAIL)-1]
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return body
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def _decode_taf_value(ins: TafInputStream, dtype: int, depth: int = 0) -> object:
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"""递归解码单个 TAF 值"""
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if dtype == TafType.ZERO:
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return 0
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if dtype in (TafType.INT8, TafType.INT16, TafType.INT32, TafType.INT64):
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return ins._read_int_value(dtype)
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if dtype in (TafType.FLOAT, TafType.DOUBLE):
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import struct as _s
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if dtype == TafType.FLOAT:
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return round(_s.unpack('>f', ins.buf.read(4))[0], 4)
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return round(_s.unpack('>d', ins.buf.read(8))[0], 6)
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if dtype == TafType.STRING1:
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ln = ins.buf.read(1)[0]
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return ins.buf.read(ln).decode('utf-8', errors='replace')
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if dtype == TafType.STRING4:
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import struct as _s
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ln = _s.unpack('>I', ins.buf.read(4))[0]
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return ins.buf.read(ln).decode('utf-8', errors='replace')
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if dtype == TafType.MAP:
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cnt = ins._read_int_len()
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m = {}
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for _ in range(cnt):
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_, kt = ins.read_head()
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k = _decode_taf_value(ins, kt, depth + 1)
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_, vt = ins.read_head()
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v = _decode_taf_value(ins, vt, depth + 1)
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m[k] = v
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return m
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if dtype == TafType.LIST:
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cnt = ins._read_int_len()
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items = []
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for _ in range(cnt):
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_, it = ins.read_head()
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items.append(_decode_taf_value(ins, it, depth + 1))
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return items
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if dtype == TafType.SIMPLE_LIST:
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ins.read_head() # element type INT8
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ln = ins._read_int_len()
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return f"<bytes {ln}B>"
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if dtype == TafType.STRUCT_BEGIN:
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return _decode_taf_struct(ins, depth + 1)
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return f"<0x{dtype:02x}>"
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def _decode_taf_struct(ins: TafInputStream, depth: int = 0) -> dict:
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"""解码一个 TAF 结构体 (已消费 STRUCT_BEGIN) → 有序字典"""
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fields = {}
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while True:
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try:
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tag, dtype = ins.peek_head()
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except EOFError:
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break
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if dtype == TafType.STRUCT_END:
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ins.read_head()
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break
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ins.read_head()
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# 限制递归深度
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if depth < 5:
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try:
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val = _decode_taf_value(ins, dtype, depth)
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except Exception:
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val = f"<decode_err:0x{dtype:02x}>"
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else:
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val = f"<...>"
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try:
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ins.skip_field(dtype)
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except Exception:
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break
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key = f"tag{tag}"
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if key in fields:
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key = f"{key}_2"
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fields[key] = val
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return fields
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def _extract_wup(body: bytes) -> bytes:
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"""从 WSS 响应 body 中提取干净的 WUP 包"""
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if len(body) < 5:
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return body
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# 大包格式: [1B prefix][4B wup_len][wup_body][tail]
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# prefix 可能是 0x00，必须优先于 4B total_len 判断。
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wup_len = int.from_bytes(body[1:5], 'big')
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if 5 + wup_len <= len(body) and body[5:7] == b'\x10\x03':
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return body[5:5 + wup_len]
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total_len = int.from_bytes(body[0:4], 'big')
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if 8 <= total_len <= len(body) and body[4:6] == b'\x10\x03':
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return body[:total_len]
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if 5 + wup_len <= len(body):
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return body[5:5 + wup_len]
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return body
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def _decode_wup_body(body: bytes) -> dict:
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"""解码 WUP 封装 (请求/响应通用) → {servant, func, data}"""
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result = {}
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wup = normalize_wup_payload(_extract_wup(body))
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# 手动解析 WUP，WSS 大帧常在 tag10 后追加校验/尾部字节
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try:
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ins = TafInputStream(wup)
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# 读 WUP 字段 tag1~tag10，读到 tag10 后停止（忽略尾部垃圾）
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sBuffer = b''
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while True:
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try:
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tag, dtype = ins.peek_head()
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except EOFError:
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break
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# tag10 是最后一个合法 WUP 字段
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if tag > 10:
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break
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ins.read_head()
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if tag == 1:
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if dtype != TafType.ZERO:
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ins._read_int_value(dtype)
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elif tag in (2, 3):
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if dtype != TafType.ZERO:
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ins._read_int_value(dtype)
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elif tag == 4:
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if dtype != TafType.ZERO:
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ins._read_int_value(dtype)
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elif tag == 5:
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result["servant"] = _decode_taf_value(ins, dtype)
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elif tag == 6:
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result["func"] = _decode_taf_value(ins, dtype)
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elif tag == 7:
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if dtype == TafType.SIMPLE_LIST:
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ins.read_head()
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ln = ins._read_int_len()
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sBuffer = ins.buf.read(ln)
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else:
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ins.skip_field(dtype)
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elif tag == 8:
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if dtype != TafType.ZERO:
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ins._read_int_value(dtype)
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elif tag in (9, 10):
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ins.skip_field(dtype)
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if tag == 10:
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break
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else:
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ins.skip_field(dtype)
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# 解析 sBuffer → newdata MAP
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if sBuffer:
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try:
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sins = TafInputStream(sBuffer)
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stag, sdt = sins.read_head()
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if stag == 0 and sdt == TafType.MAP:
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cnt = sins._read_int_len()
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for _ in range(cnt):
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_, kt = sins.read_head()
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k = _decode_taf_value(sins, kt)
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_, vt = sins.read_head()
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if vt == TafType.SIMPLE_LIST:
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sins.read_head()
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vln = sins._read_int_len()
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v = sins.buf.read(vln)
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if v:
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try:
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tins = TafInputStream(v)
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ttag, tdt = tins.peek_head()
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if tdt == TafType.STRUCT_BEGIN:
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tins.read_head()
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result[k] = _decode_taf_struct(tins)
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else:
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result[k] = f"<{len(v)}B>"
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except Exception:
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result[k] = f"<{len(v)}B>"
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else:
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result[k] = _decode_taf_value(sins, vt)
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except Exception:
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pass
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except Exception as e:
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result["err"] = str(e)
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return result
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def _truncate(obj, max_str=80):
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"""截断过长的值，使日志紧凑"""
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if isinstance(obj, str):
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if len(obj) > max_str:
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return obj[:max_str] + f"...({len(obj)})"
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return obj
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if isinstance(obj, dict):
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return {k: _truncate(v, max_str) for k, v in obj.items()}
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if isinstance(obj, list):
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return [_truncate(v, max_str) for v in obj[:5]]
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return obj
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def _fmt_fields(fields: dict) -> str:
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"""把字段字典格式化为一行摘要"""
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parts = []
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for k, v in fields.items():
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if isinstance(v, dict):
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parts.append(f"{k}={{...}}")
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elif isinstance(v, list):
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parts.append(f"{k}=[{len(v)}项]")
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else:
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sv = str(v)
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if len(sv) > 60:
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sv = sv[:60] + "..."
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parts.append(f"{k}={sv}")
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return ", ".join(parts)
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def format_wss_log(body: bytes, cmd: int, seq: int, direction: str) -> str:
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"""格式化单条 WSS 帧的日志行
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Args:
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body: 帧体 (不含 6B 头)
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cmd: 命令字
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seq: 序列号
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direction: "发" 或 "收"
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Returns:
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可读日志字符串
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"""
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prefix = f"[{direction}]"
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# 心跳精简
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if cmd == 0x10:
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return f"{prefix} HB →"
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if cmd == 0x11:
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return f"{prefix} HB ←"
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# RPC 请求/响应
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if cmd in (0x03, 0x04):
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decoded = _decode_wup_body(body)
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svc = decoded.get("servant", "")
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func = decoded.get("func", "")
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err = decoded.get("err")
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if err:
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return f"{prefix} RPC ERR: {err}"
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label = f"{svc}.{func}" if svc else "RPC"
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# 找 tRsp/tResp/tReq
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for key in ("tRsp", "tResp", "tReq"):
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data = decoded.get(key)
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if isinstance(data, dict):
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return f"{prefix} {label} {_fmt_fields(_truncate(data))}"
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return f"{prefix} {label}"
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# AUTH
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if cmd == 0x0a:
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text = _strip_tail(body).decode('utf-8', errors='replace')
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return f"{prefix} AUTH {text[:100]}{'...' if len(text) > 100 else ''}"
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# REGISTER / CONFIRM / PUSH 等
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clean = _strip_tail(body)
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try:
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ins = TafInputStream(clean)
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# 看第一个 head
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tag, dtype = ins.peek_head()
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if dtype == TafType.STRUCT_BEGIN:
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ins.read_head()
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fields = _decode_taf_struct(ins)
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elif dtype == TafType.MAP:
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ins.read_head()
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cnt = ins._read_int_len()
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fields = {}
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for _ in range(cnt):
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_, kt = ins.read_head()
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k = _decode_taf_value(ins, kt)
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_, vt = ins.read_head()
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v = _decode_taf_value(ins, vt)
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fields[k] = v
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elif dtype == TafType.LIST:
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ins.read_head()
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cnt = ins._read_int_len()
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items = []
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for _ in range(cnt):
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_, it = ins.read_head()
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items.append(_decode_taf_value(ins, it))
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fields = {"items": items}
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else:
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fields = {}
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cmd_name = CMD_NAMES.get(cmd, f"0x{cmd:02x}")
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if fields:
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return f"{prefix} {cmd_name} {_fmt_fields(_truncate(fields))}"
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return f"{prefix} {cmd_name}"
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except Exception:
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cmd_name = CMD_NAMES.get(cmd, f"0x{cmd:02x}")
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return f"{prefix} {cmd_name} ({len(body)}B)"
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