150 lines
4.3 KiB
Python
150 lines
4.3 KiB
Python
"""
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InfluxDB 客户端模块
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"""
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from PyQt6.QtCore import QObject, pyqtSignal as Signal, QTimer, pyqtSlot as Slot
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from influxdb_client import InfluxDBClient as InfluxClientLib
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from typing import Dict, List, Optional
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import logging
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logger = logging.getLogger(__name__)
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class InfluxDBClient(QObject):
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"""
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InfluxDB 客户端，用于获取实时数据
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"""
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dataReceived = Signal(dict) # 数据接收信号，参数为 {field_name: value}
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errorOccurred = Signal(str) # 错误信号
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def __init__(self, parent=None):
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super().__init__(parent)
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self._client: Optional[InfluxClientLib] = None
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self._url: str = ""
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self._token: str = ""
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self._org: str = ""
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self._bucket: str = ""
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self._query: str = ""
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self._timer: Optional[QTimer] = None
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self._is_connected: bool = False
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@Slot(str, str, str, str)
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def connect(self, url: str, token: str, org: str, bucket: str):
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"""连接到 InfluxDB"""
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try:
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self._url = url
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self._token = token
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self._org = org
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self._bucket = bucket
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if self._client:
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self._client.close()
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self._client = InfluxClientLib(
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url=url,
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token=token,
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org=org
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)
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# 测试连接
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query_api = self._client.query_api()
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test_query = f'from(bucket: "{bucket}") |> range(start: -1m) |> limit(n: 1)'
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query_api.query(test_query)
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self._is_connected = True
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logger.info(f"Connected to InfluxDB: {url}")
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except Exception as e:
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self._is_connected = False
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error_msg = f"连接失败: {str(e)}"
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logger.error(error_msg)
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self.errorOccurred.emit(error_msg)
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@Slot(str)
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def setQuery(self, query: str):
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"""设置查询语句"""
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self._query = query
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@Slot(int)
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def startQuery(self, interval_ms: int = 1000):
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"""开始定时查询，interval_ms 为毫秒"""
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if not self._is_connected:
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self.errorOccurred.emit("未连接到 InfluxDB")
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return
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if self._timer:
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self._timer.stop()
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self._timer = QTimer(self)
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self._timer.timeout.connect(self._executeQuery)
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self._timer.start(interval_ms)
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# 立即执行一次
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self._executeQuery()
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@Slot()
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def stopQuery(self):
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"""停止查询"""
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if self._timer:
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self._timer.stop()
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def _executeQuery(self):
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"""执行查询"""
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if not self._is_connected or not self._query:
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return
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try:
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query_api = self._client.query_api()
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result = query_api.query(self._query)
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# 解析查询结果
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data = {}
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for table in result:
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for record in table.records:
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field = record.get_field()
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value = record.get_value()
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# 如果同一个字段有多个值，取最后一个
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data[field] = value
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if data:
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self.dataReceived.emit(data)
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except Exception as e:
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error_msg = f"查询失败: {str(e)}"
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logger.error(error_msg)
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self.errorOccurred.emit(error_msg)
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@Slot()
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def disconnect(self):
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"""断开连接"""
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# 安全地停止定时器（可能在程序退出时已被销毁）
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if self._timer:
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try:
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self._timer.stop()
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except RuntimeError:
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# QTimer 已被销毁，忽略错误
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pass
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self._timer = None
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if self._client:
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try:
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self._client.close()
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except Exception:
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# 客户端可能已被关闭，忽略错误
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pass
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self._client = None
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self._is_connected = False
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def __del__(self):
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"""析构函数：安全地清理资源"""
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try:
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self.disconnect()
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except Exception:
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# 程序退出时 Qt 对象可能已被销毁，忽略所有异常
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pass
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