From 2a91d6b9b65e941a2979955e2fb80fffe1963427 Mon Sep 17 00:00:00 2001 From: 1122455801 Date: Fri, 17 May 2019 14:57:58 +0800 Subject: [PATCH] Create data_recoder.md --- docs/data_recoder.md | 271 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 271 insertions(+) create mode 100644 docs/data_recoder.md diff --git a/docs/data_recoder.md b/docs/data_recoder.md new file mode 100644 index 00000000..8c3bc076 --- /dev/null +++ b/docs/data_recoder.md @@ -0,0 +1,271 @@ +# 行情记录 +行情记录模块用于实时行情的收录: +- 连接上接口后并且启动行情记录模块; +- 通过本地合约(vt_symbol)添加记录任务; +- 后台会自动调用行情API接口的suscribe()函数自动订阅行情; +- 行情信息通过database_manager模块的save_bar_data()函数/save_tick_data()函数载入到数据库中。 + +注意:目前vnpy支持的数据库为SQLite/ MySQL/ PostgreSQL/ MongoDB。若用户使用MongoDB,则行情记录数据直接载入到MongoDB中。 + +  + + + +## 加载启动 +进入VN Trader后,首先登陆接口,如连接CTP;然后在菜单栏中点击“功能”->"行情记录“后,会弹出行情记录窗口,如图。 +![](https://vnpy-community.oss-cn-shanghai.aliyuncs.com/forum_experience/yazhang/data_recoder/datarecoder.png) + +此时行情记录模块的启动状态为True,会启动while循环,可以添加任务实现实时行情记录。 +``` + def start(self): + """""" + self.active = True + self.thread.start() + + def run(self): + """""" + while self.active: + try: + task = self.queue.get(timeout=1) + task_type, data = task + + if task_type == "tick": + database_manager.save_tick_data([data]) + elif task_type == "bar": + database_manager.save_bar_data([data]) + + except Empty: + continue +``` + +  + +## 开始收录 + +- 在“本地代码”选择输入需要订阅的行情,如rb1905.SHFE; +- 然后点击后边“K线记录”或者“Tick记录”中的“添加”选项,会把记录特定品种任务添加到data_recorder_setting.json上,并且显示到“K线记录列表”或者“Tick记录列表”中,如图。 +- 通过queue.put()与queue.get()异步完成收录行情信息任务。 + +![](https://vnpy-community.oss-cn-shanghai.aliyuncs.com/forum_experience/yazhang/data_recoder/start.png) + +  + +下面介绍行情收录的具体原理:若无合约记录的历史,用户需要先添加行情记录任务,如连接CTP接口后记录rb1905.SHFE的tick数据,然后调用add_tick_recording()函数执行下面工作: +1) 先创建tick_recordings字典; +2) 调用接口的suscribe()函数订阅行情; +3 )保存该tick_recordings字典到json文件上; +4) 推送行情记录事件。 + +``` + def add_tick_recording(self, vt_symbol: str): + """""" + if vt_symbol in self.tick_recordings: + self.write_log(f"已在Tick记录列表中:{vt_symbol}") + return + + contract = self.main_engine.get_contract(vt_symbol) + if not contract: + self.write_log(f"找不到合约:{vt_symbol}") + return + + self.tick_recordings[vt_symbol] = {} + "symbol": contract.symbol, + "exchange": contract.exchange.value, + "gateway_name": contract.gateway_name + } + + self.subscribe(contract) + self.save_setting() + self.put_event() + + self.write_log(f"添加Tick记录成功:{vt_symbol}") +``` + +下面对add_tick_recording()函数里面调用的子函数进行扩展: + +### 订阅行情 + +调用main_engine的suscribe()函数来订阅行情,需要填入的信息为symbol、exchange、gateway_name +``` + def subscribe(self, contract: ContractData): + """""" + req = SubscribeRequest( + symbol=contract.symbol, + exchange=contract.exchange + ) + self.main_engine.subscribe(req, contract.gateway_name) +``` + +  + +### 将订阅信息保存到json文件 + +- 主要把tick_recordings或者bar_recordings通过save_json()函数保存到C:\Users\Administrator\\.vntrader文件夹内的data_recorder_setting.json上。 +- 该json文件用于存放行情记录的任务,当每次启动行情模块后,会调用load_setting()函数来得到tick_recordings和bar_recordings字典,进而开始记录的任务。 +``` +setting_filename = "data_recorder_setting.json" + def save_setting(self): + """""" + setting = { + "tick": self.tick_recordings, + "bar": self.bar_recordings + } + save_json(self.setting_filename, setting) + + def load_setting(self): + """""" + setting = load_json(self.setting_filename) + self.tick_recordings = setting.get("tick", {}) + self.bar_recordings = setting.get("bar", {}) +``` + +  + +### 推送行情记录事件 + +- 创建行情记录列表tick_symbols和bar_symbols,并且缓存在data字典里; +- 创建evnte对象,其类型是EVENT_RECORDER_UPDATE, 内容是data字典; +- 调用event_engine的put()函数推送event事件。 + +``` + def put_event(self): + """""" + tick_symbols = list(self.tick_recordings.keys()) + tick_symbols.sort() + + bar_symbols = list(self.bar_recordings.keys()) + bar_symbols.sort() + + data = { + "tick": tick_symbols, + "bar": bar_symbols + } + + event = Event( + EVENT_RECORDER_UPDATE, + data + ) + self.event_engine.put(event) +``` + +  + +### 注册行情记录事件 + +register_event()函数分别注册2种事件:EVENT_CONTRACT、EVENT_TICK +- EVENT_CONTRACT事件,调用的是process_contract_event()函数: 从tick_recordings和bar_recordings字典获取需要订阅的合约品种;然后使用subscribe()函数进行订阅行情。 +- EVENT_TICK事件,调用的是process_tick_event()函数:从tick_recordings和bar_recordings字典获取需要订阅的合约品种;然后使用record_tick()和record_bar()函数,把行情记录任务推送到queue队列中等待执行。 + +``` + def register_event(self): + """""" + self.event_engine.register(EVENT_TICK, self.process_tick_event) + self.event_engine.register(EVENT_CONTRACT, self.process_contract_event) + + def process_tick_event(self, event: Event): + """""" + tick = event.data + + if tick.vt_symbol in self.tick_recordings: + self.record_tick(tick) + + if tick.vt_symbol in self.bar_recordings: + bg = self.get_bar_generator(tick.vt_symbol) + bg.update_tick(tick) + + def process_contract_event(self, event: Event): + """""" + contract = event.data + vt_symbol = contract.vt_symbol + + if (vt_symbol in self.tick_recordings or vt_symbol in self.bar_recordings): + self.subscribe(contract) + + def record_tick(self, tick: TickData): + """""" + task = ("tick", copy(tick)) + self.queue.put(task) + + def record_bar(self, bar: BarData): + """""" + task = ("bar", copy(bar)) + self.queue.put(task) + + def get_bar_generator(self, vt_symbol: str): + """""" + bg = self.bar_generators.get(vt_symbol, None) + + if not bg: + bg = BarGenerator(self.record_bar) + self.bar_generators[vt_symbol] = bg + + return bg +``` + +  + +### 执行记录行情任务 + +在while循环中,从queue队列读取任务,调用save_tick_data()或者save_bar_data()函数来记录数据,并且载入到数据库中。 +``` + def run(self): + """""" + while self.active: + try: + task = self.queue.get(timeout=1) + task_type, data = task + + if task_type == "tick": + database_manager.save_tick_data([data]) + elif task_type == "bar": + database_manager.save_bar_data([data]) + + except Empty: + continue +``` + +  + + + + +## 移除记录 + +移除记录操作:输入需要移除合约品种的本地代码,如rb1905.SHFE。该本地代码必须在“Tick记录列表” 或者“K线记录列表”中。若要移除Tick记录,只需在”Tick记录“那一栏上点击”移除“按钮即可。 + +下面展示代码运作原理: + +- 从tick_recordings字典移除vt_symbol +- 调用save_setting()函数保存json配置文件 +- 推送最新的tick_recordings字典来继续记录行情,原来移除合约品种不再记录。 +``` + def remove_tick_recording(self, vt_symbol: str): + """""" + if vt_symbol not in self.tick_recordings: + self.write_log(f"不在Tick记录列表中:{vt_symbol}") + return + + self.tick_recordings.pop(vt_symbol) + self.save_setting() + self.put_event() + + self.write_log(f"移除Tick记录成功:{vt_symbol}") +``` + +  + +## 停止记录 + +停止记录操作:只需手动关闭行情记录模块窗口就停止记录行情。 + +- 记录行情状态改为False, 停止while循环; +- 调用join()函数关掉线程。 + +``` + def close(self): + """""" + self.active = False + + if self.thread.isAlive(): + self.thread.join() +``` \ No newline at end of file