243 lines
7.6 KiB
Python
243 lines
7.6 KiB
Python
import socket
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from rest_framework.exceptions import ParseError
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import json
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import time
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from django.core.cache import cache
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from apps.utils.thread import MyThread
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import struct
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import uuid
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import logging
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import threading
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myLogger = logging.getLogger('log')
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def get_checksum(body_msg):
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return sum(body_msg) & 0xFF
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def handle_bytes(arr):
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if len(arr) < 8:
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return f"返回数据长度错误-{arr}"
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if arr[0] != 0xEB or arr[1] != 0x90:
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return "数据头不正确"
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# 读取长度信息
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length_arr = arr[2:4][::-1] # 反转字节
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length = int.from_bytes(length_arr, byteorder='little', signed=True) # 小端格式
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# 提取内容
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body = arr[4:4 + length - 3]
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# 校验和检查
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check_sum = get_checksum(body)
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if check_sum != arr[length + 1]:
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return "校验错误"
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# 尾部标识检查
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if arr[length + 2] != 0xFF or arr[length + 3] != 0xFE:
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return "尾错误"
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content = body.decode('utf-8')
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res = json.loads(content)
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return res[0]
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def get_tyy_data_t(host, port, tid):
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cd_thread_key_id = f"cd_thread_{host}_{port}_id"
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cd_thread_key_val = f"cd_thread_{host}_{port}_val"
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sc = None
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def connect_and_send(retry=1):
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nonlocal sc
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try:
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if sc is None:
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sc = socket.socket()
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sc.connect((host, int(port)))
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sc.sendall(b"R")
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except BrokenPipeError:
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if retry > 0:
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connect_and_send(retry-1)
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else:
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if sc:
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try:
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sc.close()
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except Exception:
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pass
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sc = None
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except OSError as e:
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sc = None
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cache.set(cd_thread_key_val, {"err_msg": f"采集器连接失败-{str(e)}"})
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except ConnectionResetError:
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sc = None
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cache.set(cd_thread_key_val, {"err_msg": "采集器重置了连接"})
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except socket.timeout:
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sc = None
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cache.set(cd_thread_key_val, {"err_msg": "采集器连接超时"})
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except Exception as e:
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sc = None
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cache.set(cd_thread_key_val, {"err_msg": f"采集器连接失败-{str(e)}"})
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while cache.get(cd_thread_key_id) == tid:
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if cache.get(cd_thread_key_val) == "get":
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cache.set(cd_thread_key_val, "working")
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connect_and_send()
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if sc is None:
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continue
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resp = sc.recv(1024)
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res = handle_bytes(resp)
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if isinstance(res, str):
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cache.set(cd_thread_key_val, {"err_msg": f'采集器返回数据错误-{res}'})
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elif not res:
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cache.set(cd_thread_key_val, {"err_msg": f"采集器返回数据为空-{str(res)}"})
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else:
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myLogger.info(f"采集器返回数据-{res}")
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cache.set(cd_thread_key_val, res)
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time.sleep(0.3)
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if sc:
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try:
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sc.close()
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except Exception:
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pass
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def get_tyy_data_2(*args, retry=1):
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host, port = args[0], int(args[1])
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cd_thread_key_id = f"cd_thread_{host}_{port}_id"
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cd_thread_key_val = f"cd_thread_{host}_{port}_val"
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cd_thread_val_id = cache.get(cd_thread_key_id, default=None)
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if cd_thread_val_id is None:
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tid = uuid.uuid4()
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cache.set(cd_thread_key_id, tid, timeout=10800)
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cd_thread = MyThread(target=get_tyy_data_t, args=(host, port, tid), daemon=True)
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cd_thread.start()
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cache.set(cd_thread_key_val, "get")
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num = 0
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get_val = False
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while True:
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num += 1
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if num > 8:
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break
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val = cache.get(cd_thread_key_val)
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if isinstance(val, dict):
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get_val = True
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if "err_msg" in val:
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raise ParseError(val["err_msg"])
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return val
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time.sleep(0.3)
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if not get_val and retry > 0:
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cache.set(cd_thread_key_id, None)
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get_tyy_data_2(*args, retry=retry-1)
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sc_all = {}
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sc_lock = threading.Lock()
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def get_tyy_data(*args, retry=1):
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host, port = args[0], int(args[1])
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global sc_all
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sc = None
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def connect_and_send(retry=1):
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nonlocal sc
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sc = sc_all.get(f"{host}_{port}", None)
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try:
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if sc is None:
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sc = socket.socket()
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sc.settimeout(5) # 设置超时
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sc.connect((host, port))
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sc_all[f"{host}_{port}"] = sc
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else:
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# 清空接收缓冲区
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sc.settimeout(0.1) # 设置短暂超时
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for _ in range(5):
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try:
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data = sc.recv(65536)
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if not data:
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break
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except (socket.timeout, BlockingIOError):
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break
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sc.settimeout(5) # 恢复原超时设置
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sc.sendall(b"R")
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except BrokenPipeError:
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if retry > 0:
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if sc:
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try:
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sc.close()
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except Exception:
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pass
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sc_all.pop(f"{host}_{port}", None)
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return connect_and_send(retry-1)
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else:
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if sc:
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try:
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sc.close()
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except Exception:
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pass
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sc_all.pop(f"{host}_{port}", None)
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sc = None
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raise ParseError("采集器连接失败-管道重置")
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except OSError as e:
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if sc:
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try:
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sc.close()
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except Exception:
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pass
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sc_all.pop(f"{host}_{port}", None)
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sc = None
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raise ParseError(f"采集器连接失败-{str(e)}")
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except TimeoutError as e:
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if sc:
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try:
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sc.close()
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except Exception:
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pass
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sc_all.pop(f"{host}_{port}", None)
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sc = None
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raise ParseError(f"采集器连接超时-{str(e)}")
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with sc_lock:
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connect_and_send()
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resp = sc.recv(1024)
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res = handle_bytes(resp)
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# myLogger.error(res)
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if isinstance(res, str):
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raise ParseError(f'采集器返回数据错误-{res}')
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else:
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return res
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def get_tyy_data_3(*args, retry=2):
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host, port = args[0], int(args[1])
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for attempt in range(retry):
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try:
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# 每次请求都新建连接（确保无共享状态）
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with socket.create_connection((host, port), timeout=10) as sc:
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sc.sendall(b"R")
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# 接收完整响应（避免数据不完整）
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# resp = b""
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# while True:
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# chunk = sc.recv(4096)
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# if not chunk:
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# break
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# resp += chunk
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resp = sc.recv(4096)
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if not resp:
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raise ParseError("设备未启动")
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res = handle_bytes(resp)
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if isinstance(res, str):
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raise ParseError(f"采集器返回数据错误: {res}")
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return res
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except (socket.timeout, ConnectionError) as e:
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if attempt == retry - 1: # 最后一次尝试失败才报错
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raise ParseError(f"采集器连接失败: {str(e)}")
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time.sleep(0.5) # 失败后等待 1s 再重试
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except ParseError:
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raise
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except Exception as e:
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raise ParseError(f"未知错误: {str(e)}") |