Samuele Locatelli
331 lines
12 KiB
Python
331 lines
12 KiB
Python
import snap7
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import struct
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import time
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import os
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import json
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import logging
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import threading
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from datetime import datetime
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from flask import Flask, render_template, jsonify
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from snap7.util import get_int, get_dint, get_real, get_string
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# Configurazione Logging: Rimosso il logging del rumore HTTP
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logging.basicConfig(level=logging.INFO, format='%(asctime)s [%(levelname)s] %(message)s')
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logger = logging.getLogger("PLC_Client_Web")
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class PLCManager:
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def __init__(self, config_path="config.json"):
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self.config_path = config_path
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self.config = {}
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self.load_config()
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self.client = snap7.client.Client()
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self.connected = False
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self.last_data = {}
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self.lock = threading.Lock()
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self.ip = self.config["PLC"]["IP"]
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self.rack = self.config["PLC"]["RACK"]
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self.slot = self.config["PLC"]["SLOT"]
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def load_config(self):
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try:
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with open(self.config_path, 'r') as f:
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self.config = json.load(f)
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logger.info(f"Configurazione caricata da {self.config_path}")
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except Exception as e:
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logger.error(f"Errore nel caricamento del config.json: {e}")
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raise
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def connect(self):
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try:
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self.client.connect(self.ip, self.rack, self.slot)
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self.connected = True
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logger.info(f"Connesso a {self.ip} (Rack: {self.rack}, Slot: {self.slot})")
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return True
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except Exception as e:
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self.connected = False
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logger.error(f"Errore di connessione a {self.ip}: {e}")
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return False
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def disconnect(self):
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try:
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self.client.disconnect()
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except:
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pass
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self.connected = False
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logger.info("Client disconnesso.")
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def read_area(self, area_key):
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"""Legge un'area basandosi sulla configurazione del JSON."""
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if not self.connected:
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return None, 0
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area_cfg = self.config["MEMORIES"].get(area_key)
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if not area_cfg:
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return None, 0
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db_id = area_cfg["id"]
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size = area_cfg["size"]
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try:
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start_time = time.perf_counter()
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data = self.client.db_read(db_id, 0, size)
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duration = (time.perf_counter() - start_time) * 1000
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return data, duration
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except Exception as e:
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logger.warning(f"Errore lettura DB{db_id}: {e}")
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self.connected = False
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return None, 0
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def fetch_all_data(self):
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"""Cicla su tutte le aree definite nel config.json e le decodifica dinamicamente."""
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results = {
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"connected": self.connected,
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"plc_ip": self.ip,
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"plc_model": "Siemens S7-300",
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"polling_period": self.config["PLC"].get("POLLING_PERIOD", "5Hz"),
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"acq_status": "waiting",
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"latencies": {},
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"measurements": []
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}
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for area_key, area_cfg in self.config["MEMORIES"].items():
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data, dur = self.read_area(area_key)
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if data is None:
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continue
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# Rilevamento tipo di decodifica basato sul config
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parsing_type = area_cfg.get("type", "complex")
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if parsing_type == "complex":
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params = {}
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for p in area_cfg.get("parameters", []):
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p_type = p.get("type")
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if p_type == "real":
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params[p["name"]] = get_real(data, p["offset"])
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elif p_type == "dint":
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params[p["name"]] = get_dint(data, p["offset"])
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elif p_type == "int":
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params[p["name"]] = get_int(data, p["offset"])
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elif p_type == "bool":
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params[p["name"]] = (data[p["offset"]] & (1 << p.get("bit", 0))) != 0
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strings = {}
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for s in area_cfg.get("strings", []):
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strings[s["name"]] = get_string(data, s["offset"])
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results[area_key] = {
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"params": params,
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"strings": strings,
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"duration": dur
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}
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elif parsing_type == "dint_array":
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# Gestione speciale per db900 che usa num_misure
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if area_key == "db900":
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num_misure = get_dint(data, 0)
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arr = []
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for i in range(num_misure):
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curr_off = 4 + (i * 4)
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if curr_off + 4 <= area_cfg["size"]:
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arr.append(get_dint(data, curr_off))
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else:
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arr.append(0)
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results[area_key] = {
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"misure": arr,
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"duration": dur
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}
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else:
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count = area_cfg.get("count", 21)
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offset = area_cfg.get("offset", 4)
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arr = []
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for i in range(count):
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curr_off = offset + (i * 4)
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if curr_off + 4 <= area_cfg["size"]:
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arr.append(get_dint(data, curr_off))
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else:
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arr.append(0)
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results[area_key] = {
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"misure": arr,
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"duration": dur
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}
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elif parsing_type == "array_real":
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count = area_cfg.get("count", 40)
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try:
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values = struct.unpack(f">{count}f", data)
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results[area_key] = {
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"values": values,
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"duration": dur
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}
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except:
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results[area_key] = {"error": "Parsing array_real failed"}
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results[area_key]["duration"] = dur
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else:
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params = {}
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for p in area_cfg.get("parameters", []):
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if p["type"] == "real":
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params[p["name"]] = get_real(data, p["offset"])
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elif p["type"] == "dint":
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params[p["name"]] = get_dint(data, p["offset"])
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results[area_key] = {
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"params": params,
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"duration": dur
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}
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# Gestione bit specifici per lo stato acquisizione (DB901)
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if "db901" in results:
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db901_res = results["db901"]
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if "params" in db901_res:
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acq = db901_res["params"].get("acquisizione", False)
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fine = db901_res["params"].get("fine_acq", False)
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pronti = db901_res["params"].get("pronti", False)
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if acq and not fine:
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results["acq_status"] = "Acquisition"
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elif fine and pronti:
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results["acq_status"] = "Finished"
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# Se finito, prendiamo i dati da db900 e salviamo
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if "db900" in results:
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results["measurements"] = results["db900"].get("misure", [])
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self.save_measurements(results)
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else:
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results["acq_status"] = "waiting"
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# Aggiungiamo x_val e y_val alla risposta se presenti
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if "x_val" in db901_res["params"]:
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db901_res["params"]["x"] = db901_res["params"]["x_val"]
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db901_res["params"]["y"] = db901_res["params"]["y_val"]
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for area_key, res in results.items():
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if isinstance(res, dict) and "duration" in res and area_key != "db901":
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results["latencies"][area_key] = res["duration"]
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return results
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def save_measurements(self, results):
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"""Salva i dati di db900 in una cartella locale."""
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try:
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# Articolo da db920 (offset 32)
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data_920 = self.client.db_read(920, 0, 186)
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articolo = get_string(data_920, 32, 30).strip()
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cod_produzione = get_string(data_920, 160, 30).strip()
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num_certificato = get_dint(data_920, 164)
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if not articolo: articolo = "Sconosciuto"
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if not cod_produzione: cod_produzione = "Sconosciuto"
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date_str = datetime.now().strftime("%Y-%m-%d")
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path_dir = os.path.join("measurements", articolo, cod_produzione)
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if not os.path.exists(path_dir):
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os.makedirs(path_dir, exist_ok=True)
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filename = f"{num_certificato}_{date_str}.json"
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path_file = os.path.join(path_dir, filename)
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save_data = {
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"date": datetime.now().isoformat(),
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"articolo": articolo,
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"cod_produzione": cod_produzione,
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"num_certificato": num_certificato,
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"misure": results["measurements"]
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}
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with open(path_file, 'w') as f:
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json.dump(save_data, f, indent=4)
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logger.info(f"Misure salvate in: {path_file}")
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except Exception as e:
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logger.error(f"Errore nel salvataggio misure: {e}")
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def get_data(self):
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with self.lock:
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return self.last_data
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def get_history(self):
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"""Recupera l'elenco dei file salvati nella cartella measurements."""
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history = []
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history_path = "measurements"
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if not os.path.exists(history_path):
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return history
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for root, dirs, files in os.walk(history_path):
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for file in files:
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if file.endswith(".json"):
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try:
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parts = root.split(os.sep)
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# Path è measurements/articolo/cod_produzione/file.json
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articolo = parts[-3]
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cod_produzione = parts[-2]
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history.append({
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"file_path": os.path.join(root, file),
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"articolo": articolo,
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"cod_produzione": cod_produzione,
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"filename": file
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})
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except:
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continue
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return history
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def load_history_file(self, file_path):
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"""Carica il contenuto di un file di misure."""
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with open(file_path, 'r') as f:
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return json.load(f)
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def run_loop(self):
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while True:
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if not self.connected:
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if not self.connect():
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time.sleep(self.config["PLC"].get("RECONNECT_DELAY", 5.0))
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continue
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data = self.fetch_all_data()
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if data:
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with self.lock:
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self.last_data = data
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time.sleep(0.5)
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app = Flask(__name__,
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static_folder='static',
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template_folder='templates')
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plc_manager = PLCManager("../client/config.json")
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@app.route('/')
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def index():
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return render_template('index.html')
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@app.route('/data')
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def data():
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return jsonify(plc_manager.get_data())
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@app.route('/history')
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def history():
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return jsonify(plc_manager.get_history())
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@app.route('/history/<path:file_path>')
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def load_history(file_path):
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# Normalizzare il percorso per evitare directory traversal
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safe_path = os.path.normpath(file_path).lstrip('/')
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if not safe_path.startswith('measurements'):
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return jsonify({"error": "Forbidden"}), 403
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try:
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content = plc_manager.load_history_file(safe_path)
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return jsonify(content)
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except Exception as e:
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return jsonify({"error": str(e)}), 500
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def run_app():
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# Avvia thread di aggiornamento dati in background
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thread = threading.Thread(target=plc_manager.run_loop, daemon=True)
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thread.start()
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# Avvia Flask
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app.run(host='0.0.0.0', port=5000, debug=False)
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if __name__ == "__main__":
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run_app()
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