Add strategy as mandatory argument

freqtrade/data/btanalysis.py

@@ -149,7 +149,14 @@ def load_backtest_stats(filename: Union[Path, str]) -> Dict[str, Any]:
     return data
 
 
-def _load_and_merge_backtest_result(strategy_name: str, filename: Path, results: Dict[str, Any]):
+def load_and_merge_backtest_result(strategy_name: str, filename: Path, results: Dict[str, Any]):
+    """
+    Load one strategy from multi-strategy result
+    and merge it with results
+    :param strategy_name: Name of the strategy contained in the result
+    :param filename: Backtest-result-filename to load
+    :param results: dict to merge the result to.
+    """
     bt_data = load_backtest_stats(filename)
     for k in ('metadata', 'strategy'):
         results[k][strategy_name] = bt_data[k][strategy_name]
@@ -226,7 +233,7 @@ def find_existing_backtest_stats(dirname: Union[Path, str], run_ids: Dict[str, s
 
             if strategy_metadata['run_id'] == run_id:
                 del run_ids[strategy_name]
-                _load_and_merge_backtest_result(strategy_name, filename, results)
+                load_and_merge_backtest_result(strategy_name, filename, results)
 
         if len(run_ids) == 0:
             break

freqtrade/rpc/api_server/api_backtest.py

@@ -6,7 +6,7 @@ from typing import List
 from fastapi import APIRouter, BackgroundTasks, Depends
 
 from freqtrade.configuration.config_validation import validate_config_consistency
-from freqtrade.data.btanalysis import get_backtest_resultlist, load_backtest_stats
+from freqtrade.data.btanalysis import get_backtest_resultlist, load_and_merge_backtest_result
 from freqtrade.enums import BacktestState
 from freqtrade.exceptions import DependencyException
 from freqtrade.rpc.api_server.api_schemas import (BacktestHistoryEntry, BacktestRequest,
@@ -212,14 +212,21 @@ def api_backtest_history(config=Depends(get_config), ws_mode=Depends(is_webserve
 
 
 @router.get('/backtest/history/result', response_model=BacktestResponse, tags=['webserver', 'backtest'])
-def api_backtest_history_result(filename: str, config=Depends(get_config), ws_mode=Depends(is_webserver_mode)):
+def api_backtest_history_result(filename: str, strategy: str, config=Depends(get_config), ws_mode=Depends(is_webserver_mode)):
     # Get backtest result history, read from metadata files
     fn = config['user_data_dir'] / 'backtest_results' / filename
+    results = {
+        'metadata': {},
+        'strategy': {},
+        'strategy_comparison': [],
+    }
+
+    load_and_merge_backtest_result(strategy, fn, results)
     return {
         "status": "ended",
         "running": False,
         "step": "",
         "progress": 1,
         "status_msg": "Historic result",
-        "backtest_result": load_backtest_stats(fn)
+        "backtest_result": results,
     }

tests/rpc/test_rpc_apiserver.py

@@ -1599,7 +1599,8 @@ def test_api_backtest_history(botclient, mocker, testdatadir):
     result = rc.json()
     assert len(result) == 1
     fn = result[0]['filename']
-    rc = client_get(client, f"{BASE_URI}/backtest/history/result?filename={fn}")
+    strategy = result[0]['strategy']
+    rc = client_get(client, f"{BASE_URI}/backtest/history/result?filename={fn}&strategy={strategy}")
     assert_response(rc)
     result2 = rc.json()
     assert result2