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mcm-26-b/src/mcm26b/harness/playback.py
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2026-09-11 11:36:08 +08:00

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"""回放传输:把既有演练日志作为服务器响应原样回放给客户端。
用于 P1 验收"本地状态机与官方响应一致":官方演练记录
(output/q1/practice/*_actions.json)逐条喂给客户端,客户端重建的
状态必须与当时服务器返回的虚拟时刻逐步吻合。
按录制顺序匹配(客户端的 request_id 生成规则与采集器不同,
故不参与匹配;故障重试场景请用 ScriptedFaultTransport)。
"""
from __future__ import annotations
import json
from urllib.parse import urlsplit
from ..protocol.transport import Transport, TransportResponse
class PlaybackTransport(Transport):
"""events: 演练日志 [{path, request, response, ...}, ...]。"""
def __init__(self, events: list[dict]):
self.events = list(events)
self.index = 0
self.served: list[dict] = []
def post(self, url, body, headers, timeout):
if self.index >= len(self.events):
raise AssertionError("回放日志已耗尽仍有请求")
event = self.events[self.index]
path = urlsplit(url).path
if path != event["path"]:
raise AssertionError(
f"回放顺序不一致: 客户端请求 {path}, 录制预期 {event['path']}")
self.index += 1
self.served.append(event)
return TransportResponse(
200, json.dumps(event["response"], ensure_ascii=False).encode("utf-8"))