chore: import upstream snapshot with attribution

backend/web/chartHandler.py

@@ -0,0 +1,50 @@
+#!/usr/local/bin/python3
+# -*- coding: utf-8 -*-
+
+
+from tornado import gen
+import libs.stock_web_dic as stock_web_dic
+import web.base as webBase
+import libs.common as common
+import logging
+import tornado.web
+import matplotlib
+matplotlib.use('Agg')
+import matplotlib.pyplot as plt
+import numpy as np
+import io
+
+def GenImage(freq):
+    t = np.linspace(0, 10, 500)
+    y = np.sin(t * freq * 2 * 3.141)
+    fig1 = plt.figure()
+    plt.plot(t, y)
+    plt.xlabel('Time [s]')
+    memdata = io.BytesIO()
+    plt.grid(True)
+    plt.savefig(memdata, format='png')
+    image = memdata.getvalue()
+    return image
+
+
+class ImageHandler(tornado.web.RequestHandler):
+    @gen.coroutine
+    def get(self):
+        image = GenImage(0.5)
+        self.set_header('Content-type', 'image/png')
+        self.set_header('Content-length', len(image))
+        self.write(image)
+
+# 获得页面数据。
+class GetChartHtmlHandler(webBase.BaseHandler):
+    @gen.coroutine
+    def get(self):
+        name = self.get_argument("table_name", default=None, strip=False)
+        #stockWeb = stock_web_dic.STOCK_WEB_DATA_MAP[name]
+        # self.uri_ = ("self.request.url:", self.request.uri)
+        # print self.uri_
+        logging.info("chart...")
+        self.render("stock_chart.html", entries="",
+                    pythonStockVersion=common.__version__,
+                    leftMenu=webBase.GetLeftMenu(self.request.uri))
+