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Pull request overview
Implements a functional PowerMemMiddleware for LangChain agents, enabling long-term memory retrieval before model calls and optional interaction write-back after agent runs, aligning the package with its contract tests and example usage.
Changes:
- Added PowerMem search + context formatting and injected retrieved memories into the model request.
- Implemented sync/async middleware hooks (
before_agent/abefore_agent,wrap_model_call/awrap_model_call,after_agent/aafter_agent) with fail-open behavior. - Added helper utilities for extracting latest user/assistant text and safely calling sync/async memory backends.
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| point. Students are expected to replace this placeholder with a LangChain | ||
| middleware implementation that satisfies the package contract tests. | ||
| """ | ||
| """为LangChain agent提供PowerMem长期记忆能力的中间件""" |
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| try: | ||
| result = self.memory.search( | ||
| query, | ||
| user_id=self.user_id, | ||
| limit=self.search_limit, | ||
| ) | ||
| if inspect.isawaitable(result): | ||
| result = asyncio.run(result) | ||
| return {"powermem_context": _format_search_result(result)} | ||
| except Exception: | ||
| logger.warning("PowerMem search failed; continuing without memory", exc_info=True) | ||
| return {"powermem_context": ""} |
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| try: | ||
| result = self.memory.add( | ||
| interaction, | ||
| user_id=self.user_id, | ||
| infer=False, | ||
| ) | ||
| if inspect.isawaitable(result): | ||
| asyncio.run(result) | ||
| except Exception: | ||
| logger.warning("PowerMem write-back failed; agent result is unchanged", exc_info=True) | ||
| return None |
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| if isinstance(block, str): # 普通字符串 | ||
| parts.append(block) | ||
| elif isinstance(block, Mapping): # 列表 |
Member
LangChain Contract ScoreLangChain Contract Score ======================== score: 100.00 / 100 suites: 2 rule: A weighted capability receives credit only when it passes on every configured Python suite and all declared prerequisite capabilities also receive credit. Gate tests are reported but do not add points. Public import contract: PASS (gate) py311: passed py312: passed Retrieve memory before model call: PASS (35/35) py311: passed py312: passed Persist interaction after agent run: PASS (25/25) py311: passed py312: passed Disable interaction persistence: PASS (10/10) py311: passed py312: passed Fail-open on search error: PASS (15/15) py311: passed py312: passed Async memory injection: PASS (15/15) py311: passed py312: passed LangChain Contract ReportLangChain Contract Report ========================= score: 100.00 / 100 rule: A weighted capability receives credit only when it passes on every configured Python suite and all declared prerequisite capabilities also receive credit. Gate tests are reported but do not add points. Suite Summary ------------- py311: passed=6/6, failures=0, errors=0, skipped=0 py312: passed=6/6, failures=0, errors=0, skipped=0 Gate Checks ----------- Public import contract [gate] PASS - py311: passed - py312: passed Weighted Breakdown ------------------ Retrieve memory before model call [35/35] PASS - py311: passed - py312: passed Persist interaction after agent run [25/25] PASS - py311: passed - py312: passed Disable interaction persistence [10/10] PASS - py311: passed - py312: passed Fail-open on search error [15/15] PASS - py311: passed - py312: passed Async memory injection [15/15] PASS - py311: passed - py312: passed |
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