42 KiB
CTA策略模块
模块构成
CTA策略模块主要由7部分构成,如下图:
-
base:定义了CTA模块中用到的一些基础设置,如引擎类型(回测/实盘)、回测模式(K线/Tick)、本地停止单的定义以及停止单状态(等待中/已撤销/已触发)。
-
template:定义了CTA策略模板(包含信号生成和委托管理)、CTA信号(仅负责信号生成)、目标仓位算法(仅负责委托管理,适用于拆分巨型委托,降低冲击成本)。
-
strategies: 官方提供的cta策略示例,包含从最基础的双均线策略,到通道突破类型的布林带策略,到跨时间周期策略,再到把信号生成和委托管理独立开来的多信号策略。(用户自定义的策略也可以放在strategies文件夹内运行)
-
backesting:包含回测引擎和参数优化。其中回测引擎定义了数据载入、委托撮合机制、计算与统计相关盈利指标、结果绘图等函数。
-
converter:定义了针对上期所品种平今/平昨模式的委托转换模块;对于其他品种用户也可以通过可选参数lock切换至锁仓模式。
-
engine:定义了CTA策略实盘引擎,其中包括:RQData客户端初始化和数据载入、策略的初始化和启动、推送Tick订阅行情到策略中、挂撤单操作、策略的停止和移除等。
-
ui:基于PyQt5的GUI图形应用。
数据加载
在实盘中,RQData通过实时载入数据进行策略的初始化。该功能主要在CTA实盘引擎engine.py内实现。 下面介绍具体流程:
- 在菜单栏点击“配置”,进入全局配置页面输入RQData账号密码;或者直接配置json文件,即在用户目录下.vntrader文件夹找到vt_setting.json,如图。
- 初始化RQData客户端:从vt_setting.json中读取RQData的账户、密码到rq_client.init()函数进行初始化
def init_rqdata(self):
"""
Init RQData client.
"""
username = SETTINGS["rqdata.username"]
password = SETTINGS["rqdata.password"]
if not username or not password:
return
import rqdatac
self.rq_client = rqdatac
self.rq_client.init(username, password,
('rqdatad-pro.ricequant.com', 16011))
- RQData载入实盘数据:输入vt_symbol后,首先会转换成符合RQData格式的rq_symbol,通过get_price()函数下载数据,并且插入到数据库中。
def query_bar_from_rq(
self, vt_symbol: str, interval: Interval, start: datetime, end: datetime
):
"""
Query bar data from RQData.
"""
symbol, exchange_str = vt_symbol.split(".")
rq_symbol = to_rq_symbol(vt_symbol)
if rq_symbol not in self.rq_symbols:
return None
end += timedelta(1) # For querying night trading period data
df = self.rq_client.get_price(
rq_symbol,
frequency=interval.value,
fields=["open", "high", "low", "close", "volume"],
start_date=start,
end_date=end
)
data = []
for ix, row in df.iterrows():
bar = BarData(
symbol=symbol,
exchange=Exchange(exchange_str),
interval=interval,
datetime=row.name.to_pydatetime(),
open_price=row["open"],
high_price=row["high"],
low_price=row["low"],
close_price=row["close"],
volume=row["volume"],
gateway_name="RQ"
)
data.append(bar)
策略开发
CTA策略模板提供完整的信号生成和委托管理功能,用户可以基于该模板自行开发策略。新策略可以放在用户运行的文件内(推荐),如在c:\users\administrator.vntrader目录下创建strategies文件夹;可以放在根目录下vnpy\app\cta_strategy\strategies文件夹内。 注意:策略文件命名是以下划线模式,如boll_channel_strategy.py;而策略类命名采用的是驼峰式,如BollChannelStrategy。
下面通过BollChannelStrategy策略示例,来展示策略开发的具体步骤:
参数设置
定义策略参数并且初始化策略变量。策略参数为策略类的公有属性,用户可以通过创建新的实例来调用或者改变策略参数。
如针对rb1905品种,用户可以创建基于BollChannelStrategy的策略示例,如RB_BollChannelStrategy,boll_window可以由18改成30。
创建策略实例的方法有效地实现了一个策略跑多个品种,并且其策略参数可以通过品种的特征进行调整。
boll_window = 18
boll_dev = 3.4
cci_window = 10
atr_window = 30
sl_multiplier = 5.2
fixed_size = 1
boll_up = 0
boll_down = 0
cci_value = 0
atr_value = 0
intra_trade_high = 0
intra_trade_low = 0
long_stop = 0
short_stop = 0
类的初始化
初始化分3步:
- 通过super( )的方法继承CTA策略模板,在__init__( )函数传入CTA引擎、策略名称、vt_symbol、参数设置。
- 调用K线生成模块:通过时间切片来把Tick数据合成1分钟K线数据,然后更大的时间周期数据,如15分钟K线。
- 调用K线时间序列管理模块:基于K线数据,如1分钟、15分钟,来生成相应的技术指标。
def __init__(self, cta_engine, strategy_name, vt_symbol, setting):
""""""
super(BollChannelStrategy, self).__init__(
cta_engine, strategy_name, vt_symbol, setting
)
self.bg = BarGenerator(self.on_bar, 15, self.on_15min_bar)
self.am = ArrayManager()
策略的初始化、启动、停止
通过“CTA策略”组件的相关功能按钮实现。
注意:函数load_bar(10),代表策略初始化需要载入10个交易日的历史数据。该历史数据可以是Tick数据,也可以是K线数据。在策略初始化时候,会调用K线时间序列管理器计算并缓存相关的计算指标,但是并不触发交易。
def on_init(self):
"""
Callback when strategy is inited.
"""
self.write_log("策略初始化")
self.load_bar(10)
def on_start(self):
"""
Callback when strategy is started.
"""
self.write_log("策略启动")
def on_stop(self):
"""
Callback when strategy is stopped.
"""
self.write_log("策略停止")
Tick数据回报
策略订阅某品种合约行情,交易所会推送Tick数据到该策略上。
由于BollChannelStrategy是基于15分钟K线来生成交易信号的,故收到Tick数据后,需要用到K线生成模块里面的update_tick函数,通过时间切片的方法,聚合成1分钟K线数据,并且推送到on_bar函数。
def on_tick(self, tick: TickData):
"""
Callback of new tick data update.
"""
self.bg.update_tick(tick)
K线数据回报
收到推送过来的1分钟K线数据后,通过K线生成模块里面的update_bar函数,以分钟切片的方法,合成15分钟K线数据,并且推送到on_15min_bar函数。
def on_bar(self, bar: BarData):
"""
Callback of new bar data update.
"""
self.bg.update_bar(bar)
15分钟K线数据回报
负责CTA信号的生成,由3部分组成:
- 清空未成交委托:为了防止之前下的单子在上一个15分钟没有成交,但是下一个15分钟可能已经调整了价格,就用cancel_all()方法立刻撤销之前未成交的所有委托,保证策略在当前这15分钟开始时的整个状态是清晰和唯一的。
- 调用K线时间序列管理模块:基于最新的15分钟K线数据来计算相应计算指标,如布林带通道上下轨、CCI指标、ATR指标
- 信号计算:通过持仓的判断以及结合CCI指标、布林带通道、ATR指标在通道突破点挂出停止单委托(buy/sell),同时设置离场点(short/cover)。
注意:CTA策略具有低胜率和高盈亏比的特定:在难以提升胜率的情况下,研究提高策略盈亏比有利于策略盈利水平的上升。
def on_15min_bar(self, bar: BarData):
""""""
self.cancel_all()
am = self.am
am.update_bar(bar)
if not am.inited:
return
self.boll_up, self.boll_down = am.boll(self.boll_window, self.boll_dev)
self.cci_value = am.cci(self.cci_window)
self.atr_value = am.atr(self.atr_window)
if self.pos == 0:
self.intra_trade_high = bar.high_price
self.intra_trade_low = bar.low_price
if self.cci_value > 0:
self.buy(self.boll_up, self.fixed_size, True)
elif self.cci_value < 0:
self.short(self.boll_down, self.fixed_size, True)
elif self.pos > 0:
self.intra_trade_high = max(self.intra_trade_high, bar.high_price)
self.intra_trade_low = bar.low_price
self.long_stop = self.intra_trade_high - self.atr_value * self.sl_multiplier
self.sell(self.long_stop, abs(self.pos), True)
elif self.pos < 0:
self.intra_trade_high = bar.high_price
self.intra_trade_low = min(self.intra_trade_low, bar.low_price)
self.short_stop = self.intra_trade_low + self.atr_value * self.sl_multiplier
self.cover(self.short_stop, abs(self.pos), True)
self.put_event()
委托回报、成交回报、停止单回报
在策略中可以直接pass,其具体逻辑应用交给回测/实盘引擎负责。
def on_order(self, order: OrderData):
"""
Callback of new order data update.
"""
pass
def on_trade(self, trade: TradeData):
"""
Callback of new trade data update.
"""
self.put_event()
def on_stop_order(self, stop_order: StopOrder):
"""
Callback of stop order update.
"""
pass
回测研究
backtesting.py定义了回测引擎,下面主要介绍相关功能函数,以及回测引擎应用示例:
加载策略
把CTA策略逻辑,对应合约品种,以及参数设置(可在策略文件外修改)载入到回测引擎中。
def add_strategy(self, strategy_class: type, setting: dict):
""""""
self.strategy_class = strategy_class
self.strategy = strategy_class(
self, strategy_class.__name__, self.vt_symbol, setting
)
载入历史数据
负责载入对应品种的历史数据,大概有4个步骤:
- 根据数据类型不同,分成K线模式和Tick模式;
- 通过select().where()方法,有条件地从数据库中选取数据,其筛选标准包括:vt_symbol、 回测开始日期、回测结束日期、K线周期(K线模式下);
- order_by(DbBarData.datetime)表示需要按照时间顺序载入数据;
- 载入数据是以迭代方式进行的,数据最终存入self.history_data。
def load_data(self):
""""""
self.output("开始加载历史数据")
if self.mode == BacktestingMode.BAR:
s = (
DbBarData.select()
.where(
(DbBarData.vt_symbol == self.vt_symbol)
& (DbBarData.interval == self.interval)
& (DbBarData.datetime >= self.start)
& (DbBarData.datetime <= self.end)
)
.order_by(DbBarData.datetime)
)
self.history_data = [db_bar.to_bar() for db_bar in s]
else:
s = (
DbTickData.select()
.where(
(DbTickData.vt_symbol == self.vt_symbol)
& (DbTickData.datetime >= self.start)
& (DbTickData.datetime <= self.end)
)
.order_by(DbTickData.datetime)
)
self.history_data = [db_tick.to_tick() for db_tick in s]
self.output(f"历史数据加载完成,数据量:{len(self.history_data)}")
撮合成交
载入CTA策略以及相关历史数据后,策略会根据最新的数据来计算相关指标。若符合条件会生成交易信号,发出具体委托(buy/sell/short/cover),并且在下一根K线成交。
根据委托类型的不同,回测引擎提供2种撮合成交机制来尽量模仿真实交易环节:
-
限价单撮合成交:(以买入方向为例)先确定是否发生成交,成交标准为委托价>= 下一根K线的最低价;然后确定成交价格,成交价格为委托价与下一根K线开盘价的最小值。
-
停止单撮合成交:(以买入方向为例)先确定是否发生成交,成交标准为委托价<= 下一根K线的最高价;然后确定成交价格,成交价格为委托价与下一根K线开盘价的最大值。
下面展示在引擎中限价单撮合成交的流程:
- 确定会撮合成交的价格;
- 遍历限价单字典中的所有限价单,推送委托进入未成交队列的更新状态;
- 判断成交状态,若出现成交,推送成交数据和委托数据;
- 从字典中删除已成交的限价单。
def cross_limit_order(self):
"""
Cross limit order with last bar/tick data.
"""
if self.mode == BacktestingMode.BAR:
long_cross_price = self.bar.low_price
short_cross_price = self.bar.high_price
long_best_price = self.bar.open_price
short_best_price = self.bar.open_price
else:
long_cross_price = self.tick.ask_price_1
short_cross_price = self.tick.bid_price_1
long_best_price = long_cross_price
short_best_price = short_cross_price
for order in list(self.active_limit_orders.values()):
# Push order update with status "not traded" (pending)
if order.status == Status.SUBMITTING:
order.status = Status.NOTTRADED
self.strategy.on_order(order)
# Check whether limit orders can be filled.
long_cross = (
order.direction == Direction.LONG
and order.price >= long_cross_price
and long_cross_price > 0
)
short_cross = (
order.direction == Direction.SHORT
and order.price <= short_cross_price
and short_cross_price > 0
)
if not long_cross and not short_cross:
continue
# Push order udpate with status "all traded" (filled).
order.traded = order.volume
order.status = Status.ALLTRADED
self.strategy.on_order(order)
self.active_limit_orders.pop(order.vt_orderid)
# Push trade update
self.trade_count += 1
if long_cross:
trade_price = min(order.price, long_best_price)
pos_change = order.volume
else:
trade_price = max(order.price, short_best_price)
pos_change = -order.volume
trade = TradeData(
symbol=order.symbol,
exchange=order.exchange,
orderid=order.orderid,
tradeid=str(self.trade_count),
direction=order.direction,
offset=order.offset,
price=trade_price,
volume=order.volume,
time=self.datetime.strftime("%H:%M:%S"),
gateway_name=self.gateway_name,
)
trade.datetime = self.datetime
self.strategy.pos += pos_change
self.strategy.on_trade(trade)
self.trades[trade.vt_tradeid] = trade
计算策略盈亏情况
基于收盘价、当日持仓量、合约规模、滑点、手续费率等计算总盈亏与净盈亏,并且其计算结果以DataFrame格式输出,完成基于逐日盯市盈亏统计。
下面展示盈亏情况的计算过程
- 浮动盈亏 = 持仓量 *(当日收盘价 - 昨日收盘价)* 合约规模
- 实际盈亏 = 持仓变化量 * (当时收盘价 - 开仓成交价)* 合约规模
- 总盈亏 = 浮动盈亏 + 实际盈亏
- 净盈亏 = 总盈亏 - 总手续费 - 总滑点
def calculate_pnl(
self,
pre_close: float,
start_pos: float,
size: int,
rate: float,
slippage: float,
):
""""""
self.pre_close = pre_close
# Holding pnl is the pnl from holding position at day start
self.start_pos = start_pos
self.end_pos = start_pos
self.holding_pnl = self.start_pos * \
(self.close_price - self.pre_close) * size
# Trading pnl is the pnl from new trade during the day
self.trade_count = len(self.trades)
for trade in self.trades:
if trade.direction == Direction.LONG:
pos_change = trade.volume
else:
pos_change = -trade.volume
turnover = trade.price * trade.volume * size
self.trading_pnl += pos_change * \
(self.close_price - trade.price) * size
self.end_pos += pos_change
self.turnover += turnover
self.commission += turnover * rate
self.slippage += trade.volume * size * slippage
# Net pnl takes account of commission and slippage cost
self.total_pnl = self.trading_pnl + self.holding_pnl
self.net_pnl = self.total_pnl - self.commission - self.slippage
计算策略统计指标
calculate_statistics函数是基于逐日盯市盈亏情况(DateFrame格式)来计算衍生指标,如最大回撤、年化收益、盈亏比、夏普比率等。
df["balance"] = df["net_pnl"].cumsum() + self.capital
df["return"] = np.log(df["balance"] / df["balance"].shift(1)).fillna(0)
df["highlevel"] = (
df["balance"].rolling(
min_periods=1, window=len(df), center=False).max()
)
df["drawdown"] = df["balance"] - df["highlevel"]
df["ddpercent"] = df["drawdown"] / df["highlevel"] * 100
# Calculate statistics value
start_date = df.index[0]
end_date = df.index[-1]
total_days = len(df)
profit_days = len(df[df["net_pnl"] > 0])
loss_days = len(df[df["net_pnl"] < 0])
end_balance = df["balance"].iloc[-1]
max_drawdown = df["drawdown"].min()
max_ddpercent = df["ddpercent"].min()
total_net_pnl = df["net_pnl"].sum()
daily_net_pnl = total_net_pnl / total_days
total_commission = df["commission"].sum()
daily_commission = total_commission / total_days
total_slippage = df["slippage"].sum()
daily_slippage = total_slippage / total_days
total_turnover = df["turnover"].sum()
daily_turnover = total_turnover / total_days
total_trade_count = df["trade_count"].sum()
daily_trade_count = total_trade_count / total_days
total_return = (end_balance / self.capital - 1) * 100
annual_return = total_return / total_days * 240
daily_return = df["return"].mean() * 100
return_std = df["return"].std() * 100
if return_std:
sharpe_ratio = daily_return / return_std * np.sqrt(240)
else:
sharpe_ratio = 0
统计指标绘图
通过matplotlib绘制4幅图:
- 资金曲线图
- 资金回撤图
- 每日盈亏图
- 每日盈亏分布图
def show_chart(self, df: DataFrame = None):
""""""
if not df:
df = self.daily_df
if df is None:
return
plt.figure(figsize=(10, 16))
balance_plot = plt.subplot(4, 1, 1)
balance_plot.set_title("Balance")
df["balance"].plot(legend=True)
drawdown_plot = plt.subplot(4, 1, 2)
drawdown_plot.set_title("Drawdown")
drawdown_plot.fill_between(range(len(df)), df["drawdown"].values)
pnl_plot = plt.subplot(4, 1, 3)
pnl_plot.set_title("Daily Pnl")
df["net_pnl"].plot(kind="bar", legend=False, grid=False, xticks=[])
distribution_plot = plt.subplot(4, 1, 4)
distribution_plot.set_title("Daily Pnl Distribution")
df["net_pnl"].hist(bins=50)
plt.show()
单策略回测示例
- 导入回测引擎和CTA策略
- 设置回测相关参数,如:品种、K线周期、回测开始和结束日期、手续费、滑点、合约规模、起始资金
- 载入策略和数据到引擎中,运行回测。
- 计算基于逐日统计盈利情况,计算统计指标,统计指标绘图。
from vnpy.app.cta_strategy.backtesting import BacktestingEngine
from vnpy.app.cta_strategy.strategies.boll_channel_strategy import (
BollChannelStrategy,
)
from datetime import datetime
engine = BacktestingEngine()
engine.set_parameters(
vt_symbol="IF88.CFFEX",
interval="1m",
start=datetime(2018, 1, 1),
end=datetime(2019, 1, 1),
rate=3.0/10000,
slippage=0.2,
size=300,
pricetick=0.2,
capital=1_000_000,
)
engine.add_strategy(AtrRsiStrategy, {})
engine.load_data()
engine.run_backtesting()
df = engine.calculate_result()
engine.calculate_statistics()
engine.show_chart()
投资组合回测示例
投资组合回测是基于单策略回测的,其关键是每个策略都对应着各自的BacktestingEngine对象,下面介绍具体流程:
- 创建回测函数run_backtesting(),这样每添加一个策略就创建其BacktestingEngine对象。
from vnpy.app.cta_strategy.backtesting import BacktestingEngine, OptimizationSetting
from vnpy.app.cta_strategy.strategies.atr_rsi_strategy import AtrRsiStrategy
from vnpy.app.cta_strategy.strategies.boll_channel_strategy import BollChannelStrategy
from datetime import datetime
def run_backtesting(strategy_class, setting, vt_symbol, interval, start, end, rate, slippage, size, pricetick, capital):
engine = BacktestingEngine()
engine.set_parameters(
vt_symbol=vt_symbol,
interval=interval,
start=start,
end=end,
rate=rate,
slippage=slippage,
size=size,
pricetick=pricetick,
capital=capital
)
engine.add_strategy(strategy_class, setting)
engine.load_data()
engine.run_backtesting()
df = engine.calculate_result()
return df
- 分别进行单策略回测,得到各自的DataFrame,(该DataFrame包含交易时间、今仓、昨仓、手续费、滑点、当日净盈亏、累计净盈亏等基本信息,但是不包括最大回撤,夏普比率等统计信息),然后把DataFrame相加并且去除空值后即得到投资组合的DataFrame。
df1 = run_backtesting(
strategy_class=AtrRsiStrategy,
setting={},
vt_symbol="IF88.CFFEX",
interval="1m",
start=datetime(2019, 1, 1),
end=datetime(2019, 4, 30),
rate=0.3/10000,
slippage=0.2,
size=300,
pricetick=0.2,
capital=1_000_000,
)
df2 = run_backtesting(
strategy_class=BollChannelStrategy,
setting={'fixed_size': 16},
vt_symbol="RB88.SHFE",
interval="1m",
start=datetime(2019, 1, 1),
end=datetime(2019, 4, 30),
rate=1/10000,
slippage=1,
size=10,
pricetick=1,
capital=1_000_000,
)
dfp = df1 + df2
dfp =dfp.dropna()
- 创建show_portafolio()函数,同样也是创建新的BacktestingEngine对象,对传入的DataFrame计算如夏普比率等统计指标,并且画图。故该函数不仅能显示单策略回测效果,也能展示投资组合回测效果。
def show_portafolio(df):
engine = BacktestingEngine()
engine.calculate_statistics(df)
engine.show_chart(df)
show_portafolio(dfp)
参数优化
参数优化模块主要由3部分构成:
参数设置
- 设置参数优化区间:如boll_window设置起始值为18,终止值为24,步进为2,这样就得到了[18, 20, 22, 24] 这4个待优化的参数了。
- 设置优化目标字段:如夏普比率、盈亏比、总收益率等。
- 随机生成参数对组合:使用迭代工具产生参数对组合,然后把参数对组合打包到一个个字典组成的列表中
class OptimizationSetting:
"""
Setting for runnning optimization.
"""
def __init__(self):
""""""
self.params = {}
self.target_name = ""
def add_parameter(
self, name: str, start: float, end: float = None, step: float = None
):
""""""
if not end and not step:
self.params[name] = [start]
return
if start >= end:
print("参数优化起始点必须小于终止点")
return
if step <= 0:
print("参数优化步进必须大于0")
return
value = start
value_list = []
while value <= end:
value_list.append(value)
value += step
self.params[name] = value_list
def set_target(self, target_name: str):
""""""
self.target_name = target_name
def generate_setting(self):
""""""
keys = self.params.keys()
values = self.params.values()
products = list(product(*values))
settings = []
for p in products:
setting = dict(zip(keys, p))
settings.append(setting)
return settings
参数对组合回测
多进程优化时,每个进程都会运行optimize函数,输出参数对组合以及目标优化字段的结果。其步骤如下:
- 调用回测引擎
- 输入回测相关设置
- 输入参数对组合到策略中
- 运行回测
- 返回回测结果,包括:参数对组合、目标优化字段数值、策略统计指标
def optimize(
target_name: str,
strategy_class: CtaTemplate,
setting: dict,
vt_symbol: str,
interval: Interval,
start: datetime,
rate: float,
slippage: float,
size: float,
pricetick: float,
capital: int,
end: datetime,
mode: BacktestingMode,
):
"""
Function for running in multiprocessing.pool
"""
engine = BacktestingEngine()
engine.set_parameters(
vt_symbol=vt_symbol,
interval=interval,
start=start,
rate=rate,
slippage=slippage,
size=size,
pricetick=pricetick,
capital=capital,
end=end,
mode=mode
)
engine.add_strategy(strategy_class, setting)
engine.load_data()
engine.run_backtesting()
engine.calculate_result()
statistics = engine.calculate_statistics()
target_value = statistics[target_name]
return (str(setting), target_value, statistics)
多进程优化
- 根据CPU的核数来创建进程:若CPU为4核,则创建4个进程
- 在每个进程都调用apply_async( )的方法运行参数对组合回测,其回测结果添加到results中 (apply_async是异步非阻塞的,即不用等待当前进程执行完毕,随时根据系统调度来进行进程切换。)
- pool.close()与pool.join()用于进程跑完任务后,去关闭进程。
- 对results的内容通过目标优化字段标准进行排序,输出结果。
pool = multiprocessing.Pool(multiprocessing.cpu_count())
results = []
for setting in settings:
result = (pool.apply_async(optimize, (
target_name,
self.strategy_class,
setting,
self.vt_symbol,
self.interval,
self.start,
self.rate,
self.slippage,
self.size,
self.pricetick,
self.capital,
self.end,
self.mode
)))
results.append(result)
pool.close()
pool.join()
# Sort results and output
result_values = [result.get() for result in results]
result_values.sort(reverse=True, key=lambda result: result[1])
for value in result_values:
msg = f"参数:{value[0]}, 目标:{value[1]}"
self.output(msg)
return result_values
实盘运行
在实盘环境,用户可以基于编写好的CTA策略来创建新的实例,一键初始化、启动、停止策略。
创建策略实例
用户可以基于编写好的CTA策略来创建新的实例,策略实例的好处在于同一个策略可以同时去运行多个品种合约,并且每个实例的参数可以是不同的。 在创建实例的时候需要填写如图的实例名称、合约品种、参数设置。注意:实例名称不能重名;合约名称是vt_symbol的格式,如IF1905.CFFEX。
创建策略流程如下:
- 检查策略实例重名
- 添加策略配置信息(strategy_name, vt_symbol, setting)到strategies字典上
- 添加该策略要订阅行情的合约信息到symbol_strategy_map字典中;
- 把策略配置信息保存到json文件内;
- 在图形化界面更新状态信息。
def add_strategy(
self, class_name: str, strategy_name: str, vt_symbol: str, setting: dict
):
"""
Add a new strategy.
"""
if strategy_name in self.strategies:
self.write_log(f"创建策略失败,存在重名{strategy_name}")
return
strategy_class = self.classes[class_name]
strategy = strategy_class(self, strategy_name, vt_symbol, setting)
self.strategies[strategy_name] = strategy
# Add vt_symbol to strategy map.
strategies = self.symbol_strategy_map[vt_symbol]
strategies.append(strategy)
# Update to setting file.
self.update_strategy_setting(strategy_name, setting)
self.put_strategy_event(strategy)
初始化策略
- 调用策略类的on_init()回调函数,并且载入历史数据;
- 恢复上次退出之前的策略状态;
- 从.vntrader/cta_strategy_data.json内读取策略参数,最新的技术指标,以及持仓数量;
- 调用接口的subcribe()函数订阅指定行情信息;
- 策略初始化状态变成True,并且更新到日志上。
def _init_strategy(self):
"""
Init strategies in queue.
"""
while not self.init_queue.empty():
strategy_name = self.init_queue.get()
strategy = self.strategies[strategy_name]
if strategy.inited:
self.write_log(f"{strategy_name}已经完成初始化,禁止重复操作")
continue
self.write_log(f"{strategy_name}开始执行初始化")
# Call on_init function of strategy
self.call_strategy_func(strategy, strategy.on_init)
# Restore strategy data(variables)
data = self.strategy_data.get(strategy_name, None)
if data:
for name in strategy.variables:
value = data.get(name, None)
if value:
setattr(strategy, name, value)
# Subscribe market data
contract = self.main_engine.get_contract(strategy.vt_symbol)
if contract:
req = SubscribeRequest(
symbol=contract.symbol, exchange=contract.exchange)
self.main_engine.subscribe(req, contract.gateway_name)
else:
self.write_log(f"行情订阅失败,找不到合约{strategy.vt_symbol}", strategy)
# Put event to update init completed status.
strategy.inited = True
self.put_strategy_event(strategy)
self.write_log(f"{strategy_name}初始化完成")
self.init_thread = None
启动策略
- 检查策略初始化状态;
- 检查策略启动状态,避免重复启动;
- 调用策略类的on_start()函数启动策略;
- 策略启动状态变成True,并且更新到图形化界面上。
def start_strategy(self, strategy_name: str):
"""
Start a strategy.
"""
strategy = self.strategies[strategy_name]
if not strategy.inited:
self.write_log(f"策略{strategy.strategy_name}启动失败,请先初始化")
return
if strategy.trading:
self.write_log(f"{strategy_name}已经启动,请勿重复操作")
return
self.call_strategy_func(strategy, strategy.on_start)
strategy.trading = True
self.put_strategy_event(strategy)
停止策略
- 检查策略启动状态;
- 调用策略类的on_stop()函数停止策略;
- 更新策略启动状态为False;
- 对所有为成交的委托(市价单/限价单/本地停止单)进行撤单操作;
- 把策略参数,最新的技术指标,以及持仓数量保存到.vntrader/cta_strategy_data.json内;
- 在图形化界面更新策略状态。
def stop_strategy(self, strategy_name: str):
"""
Stop a strategy.
"""
strategy = self.strategies[strategy_name]
if not strategy.trading:
return
# Call on_stop function of the strategy
self.call_strategy_func(strategy, strategy.on_stop)
# Change trading status of strategy to False
strategy.trading = False
# Cancel all orders of the strategy
self.cancel_all(strategy)
# Sync strategy variables to data file
self.sync_strategy_data(strategy)
# Update GUI
self.put_strategy_event(strategy)
编辑策略
- 重新配置策略参数字典setting;
- 更新参数字典到策略中;
- 在图像化界面更新策略状态。
def edit_strategy(self, strategy_name: str, setting: dict):
"""
Edit parameters of a strategy.
"""
strategy = self.strategies[strategy_name]
strategy.update_setting(setting)
self.update_strategy_setting(strategy_name, setting)
self.put_strategy_event(strategy)
移除策略
- 检查策略状态,只有停止策略后从可以移除策略;
- 从json文件移除策略配置信息(strategy_name, vt_symbol, setting);
- 从symbol_strategy_map字典中移除该策略订阅的合约信息;
- 从strategy_orderid_map字典移除活动委托记录;
- 从strategies字典移除该策略的相关配置信息。
def remove_strategy(self, strategy_name: str):
"""
Remove a strategy.
"""
strategy = self.strategies[strategy_name]
if strategy.trading:
self.write_log(f"策略{strategy.strategy_name}移除失败,请先停止")
return
# Remove setting
self.remove_strategy_setting(strategy_name)
# Remove from symbol strategy map
strategies = self.symbol_strategy_map[strategy.vt_symbol]
strategies.remove(strategy)
# Remove from active orderid map
if strategy_name in self.strategy_orderid_map:
vt_orderids = self.strategy_orderid_map.pop(strategy_name)
# Remove vt_orderid strategy map
for vt_orderid in vt_orderids:
if vt_orderid in self.orderid_strategy_map:
self.orderid_strategy_map.pop(vt_orderid)
# Remove from strategies
self.strategies.pop(strategy_name)
return True
锁仓操作
用户在编写策略时,可以通过填写lock字段来让策略完成锁仓操作,即禁止平今,通过反向开仓来代替。
- 在cta策略模板template中,可以看到如下具体委托函数都有lock字段,并且默认为False。
def buy(self, price: float, volume: float, stop: bool = False, lock: bool = False):
"""
Send buy order to open a long position.
"""
return self.send_order(Direction.LONG, Offset.OPEN, price, volume, stop, lock)
def sell(self, price: float, volume: float, stop: bool = False, lock: bool = False):
"""
Send sell order to close a long position.
"""
return self.send_order(Direction.SHORT, Offset.CLOSE, price, volume, stop, lock)
def short(self, price: float, volume: float, stop: bool = False, lock: bool = False):
"""
Send short order to open as short position.
"""
return self.send_order(Direction.SHORT, Offset.OPEN, price, volume, stop, lock)
def cover(self, price: float, volume: float, stop: bool = False, lock: bool = False):
"""
Send cover order to close a short position.
"""
return self.send_order(Direction.LONG, Offset.CLOSE, price, volume, stop, lock)
def send_order(
self,
direction: Direction,
offset: Offset,
price: float,
volume: float,
stop: bool = False,
lock: bool = False
):
"""
Send a new order.
"""
if self.trading:
vt_orderids = self.cta_engine.send_order(
self, direction, offset, price, volume, stop, lock
)
return vt_orderids
else:
return []
- 设置lock=True后,cta实盘引擎send_order()函数发生响应,并且调用其最根本的委托函数send_server_order()去处理锁仓委托转换。首先是创建原始委托original_req,然后调用converter文件里面OffsetConverter类的convert_order_request来进行相关转换。
def send_order(
self,
strategy: CtaTemplate,
direction: Direction,
offset: Offset,
price: float,
volume: float,
stop: bool,
lock: bool
):
"""
"""
contract = self.main_engine.get_contract(strategy.vt_symbol)
if not contract:
self.write_log(f"委托失败,找不到合约:{strategy.vt_symbol}", strategy)
return ""
if stop:
if contract.stop_supported:
return self.send_server_stop_order(strategy, contract, direction, offset, price, volume, lock)
else:
return self.send_local_stop_order(strategy, direction, offset, price, volume, lock)
else:
return self.send_limit_order(strategy, contract, direction, offset, price, volume, lock)
def send_limit_order(
self,
strategy: CtaTemplate,
contract: ContractData,
direction: Direction,
offset: Offset,
price: float,
volume: float,
lock: bool
):
"""
Send a limit order to server.
"""
return self.send_server_order(
strategy,
contract,
direction,
offset,
price,
volume,
OrderType.LIMIT,
lock
)
def send_server_order(
self,
strategy: CtaTemplate,
contract: ContractData,
direction: Direction,
offset: Offset,
price: float,
volume: float,
type: OrderType,
lock: bool
):
"""
Send a new order to server.
"""
# Create request and send order.
original_req = OrderRequest(
symbol=contract.symbol,
exchange=contract.exchange,
direction=direction,
offset=offset,
type=type,
price=price,
volume=volume,
)
# Convert with offset converter
req_list = self.offset_converter.convert_order_request(original_req, lock)
# Send Orders
vt_orderids = []
for req in req_list:
vt_orderid = self.main_engine.send_order(
req, contract.gateway_name)
vt_orderids.append(vt_orderid)
self.offset_converter.update_order_request(req, vt_orderid)
# Save relationship between orderid and strategy.
self.orderid_strategy_map[vt_orderid] = strategy
self.strategy_orderid_map[strategy.strategy_name].add(vt_orderid)
return vt_orderids
- 在convert_order_request_lock()函数中,先计算今仓的量和昨可用量;然后进行判断:若有今仓,只能开仓(锁仓);无今仓时候,若平仓量小于等于昨可用,全部平昨,反之,先平昨,剩下的反向开仓。
def convert_order_request_lock(self, req: OrderRequest):
""""""
if req.direction == Direction.LONG:
td_volume = self.short_td
yd_available = self.short_yd - self.short_yd_frozen
else:
td_volume = self.long_td
yd_available = self.long_yd - self.long_yd_frozen
# If there is td_volume, we can only lock position
if td_volume:
req_open = copy(req)
req_open.offset = Offset.OPEN
return [req_open]
# If no td_volume, we close opposite yd position first
# then open new position
else:
open_volume = max(0, req.volume - yd_available)
req_list = []
if yd_available:
req_yd = copy(req)
if self.exchange == Exchange.SHFE:
req_yd.offset = Offset.CLOSEYESTERDAY
else:
req_yd.offset = Offset.CLOSE
req_list.append(req_yd)
if open_volume:
req_open = copy(req)
req_open.offset = Offset.OPEN
req_open.volume = open_volume
req_list.append(req_open)
return req_list