From a43c088448f4f95fe57caaa68ded70803f7fa368 Mon Sep 17 00:00:00 2001
From: Matthias <xmatthias@outlook.com>
Date: Sat, 22 Jan 2022 07:11:59 +0100
Subject: [PATCH] Allow @informative in webserver mode

---
 freqtrade/rpc/api_server/api_v1.py    |  8 +++++---
 freqtrade/rpc/api_server/deps.py      | 10 ++++++++++
 freqtrade/rpc/api_server/webserver.py |  2 ++
 freqtrade/rpc/rpc.py                  |  4 ++--
 4 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/freqtrade/rpc/api_server/api_v1.py b/freqtrade/rpc/api_server/api_v1.py
index 1c1ff39df..648ec6c57 100644
--- a/freqtrade/rpc/api_server/api_v1.py
+++ b/freqtrade/rpc/api_server/api_v1.py
@@ -20,7 +20,7 @@ from freqtrade.rpc.api_server.api_schemas import (AvailablePairs, Balances, Blac
                                                   Stats, StatusMsg, StrategyListResponse,
                                                   StrategyResponse, SysInfo, Version,
                                                   WhitelistResponse)
-from freqtrade.rpc.api_server.deps import get_config, get_rpc, get_rpc_optional
+from freqtrade.rpc.api_server.deps import get_config, get_exchange, get_rpc, get_rpc_optional
 from freqtrade.rpc.rpc import RPCException
 
 
@@ -217,12 +217,14 @@ def pair_candles(pair: str, timeframe: str, limit: Optional[int], rpc: RPC = Dep
 
 @router.get('/pair_history', response_model=PairHistory, tags=['candle data'])
 def pair_history(pair: str, timeframe: str, timerange: str, strategy: str,
-                 config=Depends(get_config)):
+                 config=Depends(get_config), exchange=Depends(get_exchange)):
+    # The initial call to this endpoint can be slow, as it may need to initialize
+    # the exchange class.
     config = deepcopy(config)
     config.update({
         'strategy': strategy,
     })
-    return RPC._rpc_analysed_history_full(config, pair, timeframe, timerange)
+    return RPC._rpc_analysed_history_full(config, pair, timeframe, timerange, exchange)
 
 
 @router.get('/plot_config', response_model=PlotConfig, tags=['candle data'])
diff --git a/freqtrade/rpc/api_server/deps.py b/freqtrade/rpc/api_server/deps.py
index 16f9a78c0..b428d9c6d 100644
--- a/freqtrade/rpc/api_server/deps.py
+++ b/freqtrade/rpc/api_server/deps.py
@@ -1,5 +1,7 @@
 from typing import Any, Dict, Iterator, Optional
 
+from fastapi import Depends
+
 from freqtrade.persistence import Trade
 from freqtrade.rpc.rpc import RPC, RPCException
 
@@ -28,3 +30,11 @@ def get_config() -> Dict[str, Any]:
 
 def get_api_config() -> Dict[str, Any]:
     return ApiServer._config['api_server']
+
+
+def get_exchange(config=Depends(get_config)):
+    if not ApiServer._exchange:
+        from freqtrade.resolvers import ExchangeResolver
+        ApiServer._exchange = ExchangeResolver.load_exchange(
+            config['exchange']['name'], config)
+    return ApiServer._exchange
diff --git a/freqtrade/rpc/api_server/webserver.py b/freqtrade/rpc/api_server/webserver.py
index 235063191..63812f52f 100644
--- a/freqtrade/rpc/api_server/webserver.py
+++ b/freqtrade/rpc/api_server/webserver.py
@@ -41,6 +41,8 @@ class ApiServer(RPCHandler):
     _has_rpc: bool = False
     _bgtask_running: bool = False
     _config: Dict[str, Any] = {}
+    # Exchange - only available in webserver mode.
+    _exchange = None
 
     def __new__(cls, *args, **kwargs):
         """
diff --git a/freqtrade/rpc/rpc.py b/freqtrade/rpc/rpc.py
index e969aa0a7..2232496de 100644
--- a/freqtrade/rpc/rpc.py
+++ b/freqtrade/rpc/rpc.py
@@ -995,7 +995,7 @@ class RPC:
 
     @staticmethod
     def _rpc_analysed_history_full(config, pair: str, timeframe: str,
-                                   timerange: str) -> Dict[str, Any]:
+                                   timerange: str, exchange) -> Dict[str, Any]:
         timerange_parsed = TimeRange.parse_timerange(timerange)
 
         _data = load_data(
@@ -1010,7 +1010,7 @@ class RPC:
         from freqtrade.data.dataprovider import DataProvider
         from freqtrade.resolvers.strategy_resolver import StrategyResolver
         strategy = StrategyResolver.load_strategy(config)
-        strategy.dp = DataProvider(config, exchange=None, pairlists=None)
+        strategy.dp = DataProvider(config, exchange=exchange, pairlists=None)
 
         df_analyzed = strategy.analyze_ticker(_data[pair], {'pair': pair})