add taskexecutor status check (#2038)

### What problem does this PR solve?


### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/apps/canvas_app.py

         db.close()
         return get_json_result(retmsg="Database Connection Successful!")
     except Exception as e:
-        return server_error_response(str(e))
+        return server_error_response(e)

api/apps/system_app.py

 #  See the License for the specific language governing permissions and
 #  limitations under the License
 #
+import json
+
 from flask_login import login_required
 
 from api.db.services.knowledgebase_service import KnowledgebaseService
     except Exception as e:
         res["redis"] = {"status": "red", "elapsed": "{:.1f}".format((timer() - st)*1000.), "error": str(e)}
 
+    try:
+        obj = json.loads(REDIS_CONN.get("TASKEXE"))
+        color = "green"
+        for id in obj.keys():
+            arr = obj[id]
+            if len(arr) == 1:
+                obj[id] = [0]
+            else:
+                obj[id] = [arr[i+1]-arr[i] for i in range(len(arr)-1)]
+            elapsed = max(obj[id])
+            if elapsed > 50: color = "yellow"
+            if elapsed > 120: color = "red"
+        res["task_executor"] = {"status": color, "elapsed": obj}
+    except Exception as e:
+        res["task_executor"] = {"status": "red", "error": str(e)}
+
     return get_json_result(data=res)

rag/svr/task_executor.py

 import sys
 import time
 import traceback
+from concurrent.futures import ThreadPoolExecutor
 from functools import partial
 
 from api.db.services.file2document_service import File2DocumentService
                     r["id"], tk_count, len(cks), timer() - st))
 
 
+def report_status():
+    id = "0" if len(sys.argv) < 2 else sys.argv[1]
+    while True:
+        try:
+            obj = REDIS_CONN.get("TASKEXE")
+            obj = json.load(obj)
+            if id not in obj: obj[id] = []
+            obj[id].append(timer()*1000)
+            obj[id] = obj[id][:-60]
+            REDIS_CONN.set_obj("TASKEXE", obj)
+        except Exception as e:
+            print("[Exception]:", str(e))
+        time.sleep(60)
+
 if __name__ == "__main__":
     peewee_logger = logging.getLogger('peewee')
     peewee_logger.propagate = False
     peewee_logger.addHandler(database_logger.handlers[0])
     peewee_logger.setLevel(database_logger.level)
 
+    exe = ThreadPoolExecutor(max_workers=1)
+    exe.submit(report_status)
+
     while True:
         main()