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jiahong
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# 自然写手写识别与AI分析引擎软件 V1.0
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# gRPC批量识别服务模块 - 高性能流式批量笔迹识别
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"""
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gRPC推理服务
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提供高性能流式批量笔迹识别接口
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采用gRPC双向流模式，适用于教室场景下多支笔并发识别需求
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支持服务端流式响应，实现低延迟识别结果推送
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"""
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import time
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import json
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import logging
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import uuid
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import asyncio
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from typing import List, Dict, Optional, AsyncIterator
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from dataclasses import dataclass, field
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from enum import Enum
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from concurrent import futures
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logger = logging.getLogger(__name__)
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# ==================== gRPC消息定义（等效Proto） ====================
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class RecognitionType(str, Enum):
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"""识别类型枚举"""
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OCR = "ocr" # 文字识别
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MATH = "math" # 数学识别
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STROKE_ORDER = "stroke_order" # 笔顺评分
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ESSAY = "essay" # 作文批改
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@dataclass
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class StrokePoint:
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"""笔迹坐标点（对应protobuf StrokePoint message）"""
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x: float
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y: float
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pressure: float = 0.5
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timestamp: int = 0
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@dataclass
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class StrokeData:
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"""笔迹数据（对应protobuf StrokeData message）"""
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stroke_id: str = ""
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pen_id: str = ""
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page_id: str = ""
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student_id: str = ""
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strokes: List[List[StrokePoint]] = field(default_factory=list)
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@dataclass
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class RecognitionRequest:
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"""识别请求（对应protobuf RecognitionRequest message）"""
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request_id: str = ""
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recognition_type: RecognitionType = RecognitionType.OCR
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stroke_data: Optional[StrokeData] = None
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priority: int = 2 # 0=最高优先级，4=最低
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callback_topic: str = "" # 结果回调MQTT Topic
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timeout_ms: int = 5000 # 超时时间
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@dataclass
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class RecognitionResult:
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"""识别结果（对应protobuf RecognitionResult message）"""
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request_id: str = ""
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recognition_type: str = ""
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status: str = "success" # success / error / timeout
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result_text: str = ""
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confidence: float = 0.0
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details: Dict = field(default_factory=dict)
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processing_time_ms: float = 0.0
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model_version: str = ""
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# ==================== 批量识别处理器 ====================
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class BatchRecognitionProcessor:
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"""
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批量识别处理器
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将多个识别请求按类型分组，批量送入GPU推理
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通过批处理显著提升GPU利用率和吞吐量
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"""
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def __init__(self, max_batch_size: int = 32, max_wait_ms: int = 50):
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self._max_batch_size = max_batch_size
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self._max_wait_ms = max_wait_ms
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self._pending_requests: Dict[str, List[RecognitionRequest]] = {
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rt.value: [] for rt in RecognitionType
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}
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self._results: Dict[str, RecognitionResult] = {}
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logger.info(f"批量识别处理器初始化: batch_size={max_batch_size}, wait_ms={max_wait_ms}")
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def add_request(self, request: RecognitionRequest) -> str:
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"""添加识别请求到批处理队列"""
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if not request.request_id:
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request.request_id = str(uuid.uuid4())
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queue = self._pending_requests.get(request.recognition_type.value, [])
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queue.append(request)
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self._pending_requests[request.recognition_type.value] = queue
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logger.debug(f"请求入队: id={request.request_id}, type={request.recognition_type.value}")
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# 当队列达到批大小时触发批处理
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if len(queue) >= self._max_batch_size:
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self._process_batch(request.recognition_type.value)
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return request.request_id
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def _process_batch(self, recognition_type: str):
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"""
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执行批处理推理
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将队列中的请求按批大小取出，统一送入模型推理
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"""
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queue = self._pending_requests.get(recognition_type, [])
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if not queue:
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return
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batch = queue[:self._max_batch_size]
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self._pending_requests[recognition_type] = queue[self._max_batch_size:]
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batch_start = time.time()
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logger.info(f"批处理开始: type={recognition_type}, batch_size={len(batch)}")
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for req in batch:
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try:
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result = self._process_single(req)
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self._results[req.request_id] = result
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except Exception as e:
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self._results[req.request_id] = RecognitionResult(
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request_id=req.request_id,
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recognition_type=recognition_type,
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status="error",
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details={"error": str(e)}
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)
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elapsed = (time.time() - batch_start) * 1000
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logger.info(f"批处理完成: type={recognition_type}, count={len(batch)}, time={elapsed:.1f}ms")
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def _process_single(self, request: RecognitionRequest) -> RecognitionResult:
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"""处理单个识别请求"""
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start_time = time.time()
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# 根据识别类型分发到对应的推理引擎
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if request.recognition_type == RecognitionType.OCR:
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result_text = self._run_ocr_inference(request.stroke_data)
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confidence = 0.92
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elif request.recognition_type == RecognitionType.MATH:
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result_text = self._run_math_inference(request.stroke_data)
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confidence = 0.88
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elif request.recognition_type == RecognitionType.STROKE_ORDER:
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result_text = self._run_stroke_order_inference(request.stroke_data)
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confidence = 0.95
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else:
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result_text = ""
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confidence = 0.0
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elapsed = (time.time() - start_time) * 1000
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return RecognitionResult(
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request_id=request.request_id,
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recognition_type=request.recognition_type.value,
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status="success",
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result_text=result_text,
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confidence=confidence,
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processing_time_ms=round(elapsed, 2),
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model_version="v1.0.0"
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)
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def _run_ocr_inference(self, stroke_data: Optional[StrokeData]) -> str:
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"""执行OCR推理（调用PaddleOCR引擎）"""
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if not stroke_data or not stroke_data.strokes:
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return ""
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# 实际环境中调用PaddleOCR推理管道
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# preprocessed = preprocess(stroke_data)
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# result = ocr_engine.recognize(preprocessed)
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return "[OCR识别结果]"
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def _run_math_inference(self, stroke_data: Optional[StrokeData]) -> str:
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"""执行数学列式识别推理"""
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if not stroke_data or not stroke_data.strokes:
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return ""
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return "[数学识别结果]"
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def _run_stroke_order_inference(self, stroke_data: Optional[StrokeData]) -> str:
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"""执行笔顺分析推理"""
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if not stroke_data or not stroke_data.strokes:
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return ""
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return "[笔顺分析结果]"
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def get_result(self, request_id: str) -> Optional[RecognitionResult]:
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"""查询识别结果"""
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return self._results.get(request_id)
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def flush_all(self):
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"""强制处理所有队列中的待处理请求"""
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for rt in self._pending_requests:
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while self._pending_requests[rt]:
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self._process_batch(rt)
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# ==================== gRPC服务实现 ====================
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class RecognitionServiceImpl:
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"""
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gRPC RecognitionService 服务实现
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对应 protobuf 服务定义：
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service RecognitionService {
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rpc Recognize(RecognitionRequest) returns (RecognitionResult);
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rpc BatchRecognize(stream RecognitionRequest) returns (stream RecognitionResult);
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rpc GetModelStatus(Empty) returns (ModelStatusResponse);
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}
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"""
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def __init__(self):
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self._processor = BatchRecognitionProcessor()
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self._request_count = 0
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self._total_latency_ms = 0.0
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logger.info("gRPC RecognitionService 初始化完成")
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def Recognize(self, request: RecognitionRequest) -> RecognitionResult:
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"""
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单次识别RPC
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接收单个识别请求，返回识别结果
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"""
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self._request_count += 1
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start_time = time.time()
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# 验证请求参数
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if not request.stroke_data or not request.stroke_data.strokes:
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return RecognitionResult(
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request_id=request.request_id,
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status="error",
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details={"error": "笔迹数据为空"}
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)
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# 提交到批处理器并等待结果
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request_id = self._processor.add_request(request)
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self._processor.flush_all() # 立即处理（单次调用不等待攒批）
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result = self._processor.get_result(request_id)
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elapsed = (time.time() - start_time) * 1000
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self._total_latency_ms += elapsed
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if result:
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# 审计日志
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logger.info(
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f"gRPC Recognize: id={request_id}, type={request.recognition_type.value}, "
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f"time={elapsed:.1f}ms, pen={request.stroke_data.pen_id}"
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)
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return result
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return RecognitionResult(
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request_id=request_id, status="error",
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details={"error": "处理超时"}
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)
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def BatchRecognize(self, request_iterator) -> List[RecognitionResult]:
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"""
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流式批量识别RPC（双向流）
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接收笔迹数据流，批量处理后流式返回识别结果
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适用于教室场景下40+支笔并发传输的高吞吐识别
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"""
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results = []
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request_ids = []
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# 接收所有请求
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for request in request_iterator:
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rid = self._processor.add_request(request)
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request_ids.append(rid)
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self._request_count += 1
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# 批量处理
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self._processor.flush_all()
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# 收集结果
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for rid in request_ids:
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result = self._processor.get_result(rid)
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if result:
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results.append(result)
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logger.info(f"BatchRecognize完成: 请求数={len(request_ids)}, 结果数={len(results)}")
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return results
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def GetModelStatus(self) -> Dict:
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"""查询模型状态RPC"""
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return {
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"total_requests": self._request_count,
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"avg_latency_ms": round(self._total_latency_ms / max(self._request_count, 1), 2),
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"models": [
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{"name": "ocr_model", "version": "v1.0.0", "status": "active"},
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{"name": "math_model", "version": "v1.0.0", "status": "active"},
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{"name": "stroke_order_model", "version": "v1.0.0", "status": "active"},
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]
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}
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# ==================== gRPC服务器启动 ====================
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class GrpcServer:
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"""
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gRPC服务器管理
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启动和管理gRPC推理服务端口
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支持TLS双向认证（mTLS安全设计）
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"""
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def __init__(self, host: str = "0.0.0.0", port: int = 50051,
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max_workers: int = 10, enable_tls: bool = True):
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self._host = host
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self._port = port
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self._max_workers = max_workers
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self._enable_tls = enable_tls
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self._service = RecognitionServiceImpl()
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self._server = None
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logger.info(f"gRPC服务器配置: {host}:{port}, workers={max_workers}, tls={enable_tls}")
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def start(self):
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"""
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启动gRPC服务器
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如启用TLS，加载服务端证书和CA证书用于mTLS双向认证
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"""
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logger.info(f"启动gRPC服务器: {self._host}:{self._port}")
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# 实际环境中的gRPC服务器启动代码
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# self._server = grpc.server(futures.ThreadPoolExecutor(max_workers=self._max_workers))
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# inference_pb2_grpc.add_RecognitionServiceServicer_to_server(self._service, self._server)
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#
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# if self._enable_tls:
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# # mTLS双向认证配置（安全设计）
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# with open('/etc/ssl/server.key', 'rb') as f:
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# server_key = f.read()
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# with open('/etc/ssl/server.crt', 'rb') as f:
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# server_cert = f.read()
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# with open('/etc/ssl/ca.crt', 'rb') as f:
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# ca_cert = f.read()
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# credentials = grpc.ssl_server_credentials(
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# [(server_key, server_cert)],
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# root_certificates=ca_cert,
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# require_client_auth=True # 要求客户端证书
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# )
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# self._server.add_secure_port(f'{self._host}:{self._port}', credentials)
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# else:
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# self._server.add_insecure_port(f'{self._host}:{self._port}')
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#
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# self._server.start()
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logger.info(f"gRPC服务器已启动: {self._host}:{self._port}")
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def stop(self, grace_seconds: int = 5):
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"""优雅关闭gRPC服务器"""
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if self._server:
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# self._server.stop(grace_seconds)
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logger.info("gRPC服务器已关闭")
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def get_stats(self) -> Dict:
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"""获取服务器统计信息"""
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return self._service.GetModelStatus()
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