Use .shield_channel() meth name from tractor

Use a system triggered SIGINT on app close to tear down the streaming
stack and terminate the `trio`/`tractor` runtimes deterministically.

piker/brokers/kraken.py

@@ -57,13 +57,15 @@ _ohlc_dtype = [
     ('close', float),
     ('volume', float),
     ('count', int),
-    ('vwap', float),
+    ('bar_wap', float),
 ]
 
 # UI components allow this to be declared such that additional
 # (historical) fields can be exposed.
 ohlc_dtype = np.dtype(_ohlc_dtype)
 
+_show_wap_in_history = True
+
 
 class Client:
 
@@ -341,7 +343,7 @@ async def stream_quotes(
         while True:
             try:
                 async with trio_websocket.open_websocket_url(
-                    'wss://ws.kraken.com',
+                    'wss://ws.kraken.com/',
                 ) as ws:
 
                     # XXX: setup subs
@@ -433,7 +435,7 @@ async def stream_quotes(
                                      'high',
                                      'low',
                                      'close',
-                                     'vwap',
+                                     'bar_wap',  # in this case vwap of bar
                                      'volume']
                                 ][-1] = (
                                     o,

piker/fsp/__init__.py

@@ -20,6 +20,7 @@ Financial signal processing for the peeps.
 from typing import AsyncIterator, Callable, Tuple
 
 import trio
+from trio_typing import TaskStatus
 import tractor
 import numpy as np
 
@@ -75,6 +76,7 @@ async def increment_signals(
 
         # write new slot to the buffer
         dst_shm.push(last)
+        len(dst_shm.array)
 
 
 @tractor.stream
@@ -99,9 +101,19 @@ async def cascade(
     async with data.open_feed(brokername, [symbol]) as feed:
 
         assert src.token == feed.shm.token
+
+        async def fsp_compute(
+            task_status: TaskStatus[None] = trio.TASK_STATUS_IGNORED,
+        ) -> None:
+
             # TODO: load appropriate fsp with input args
 
-        async def filter_by_sym(sym, stream):
+            async def filter_by_sym(
+                sym: str,
+                stream,
+            ):
+                # task cancellation won't kill the channel
+                with stream.shield_channel():
                     async for quotes in stream:
                         for symbol, quotes in quotes.items():
                             if symbol == sym:
@@ -122,7 +134,9 @@ async def cascade(
             # - developing some system on top of the shared mem array that
             #   is `index` aware such that historical data can be indexed
             #   relative to the true first datum? Not sure if this is sane
-        #   for derivatives.
+            #   for incremental compuations.
+            dst._first.value = src._first.value
+            dst._last.value = src._first.value
 
             # Conduct a single iteration of fsp with historical bars input
             # and get historical output
@@ -136,6 +150,7 @@ async def cascade(
             )
             history[fsp_func_name] = history_output
 
+
             # check for data length mis-allignment and fill missing values
             diff = len(src.array) - len(history)
             if diff >= 0:
@@ -146,13 +161,47 @@ async def cascade(
             # compare with source signal and time align
             index = dst.push(history)
 
-        yield index
+            await ctx.send_yield(index)
 
-        async with trio.open_nursery() as n:
+            # setup a respawn handle
-            n.start_soon(increment_signals, feed, dst)
+            with trio.CancelScope() as cs:
+                task_status.started(cs)
 
+                # rt stream
                 async for processed in out_stream:
                     log.debug(f"{fsp_func_name}: {processed}")
                     index = src.index
                     dst.array[-1][fsp_func_name] = processed
+
+                    # stream latest shm array index entry
                     await ctx.send_yield(index)
+
+        last_len = new_len = len(src.array)
+
+        async with trio.open_nursery() as n:
+
+            cs = await n.start(fsp_compute)
+
+            # Increment the underlying shared memory buffer on every "increment"
+            # msg received from the underlying data feed.
+
+            async for msg in await feed.index_stream():
+
+                new_len = len(src.array)
+
+                if new_len > last_len + 1:
+                    # respawn the signal compute task if the source
+                    # signal has been updated
+                    cs.cancel()
+                    cs = await n.start(fsp_compute)
+
+                    # TODO: adopt an incremental update engine/approach
+                    # where possible here eventually!
+
+                array = dst.array
+                last = array[-1:].copy()
+
+                # write new slot to the buffer
+                dst.push(last)
+
+                last_len = new_len

piker/fsp/_momo.py

@@ -151,8 +151,8 @@ def wma(
     return np.convolve(signal, weights, 'valid')
 
 
-# @piker.fsp(
+# @piker.fsp.signal(
-    # aggregates=[60, 60*5, 60*60, '4H', '1D'],
+#     timeframes=['1s', '5s', '15s', '1m', '5m', '1H'],
 # )
 async def _rsi(
     source: 'QuoteStream[Dict[str, Any]]',  # noqa

piker/ui/_axes.py

@@ -116,13 +116,25 @@ class DynamicDateAxis(Axis):
         indexes: List[int],
     ) -> List[str]:
 
-        bars = self.linked_charts.chart._ohlc
+        # try:
+        chart = self.linked_charts.chart
+        bars = chart._ohlc
+        shm = self.linked_charts.chart._shm
+        first = shm._first.value
+
         bars_len = len(bars)
         times = bars['time']
 
         epochs = times[list(
-            map(int, filter(lambda i: i < bars_len, indexes))
+            map(
+                int,
+                filter(
+                    lambda i: i > 0 and i < bars_len,
+                    (i-first for i in indexes)
+                )
+            )
         )]
+
         # TODO: **don't** have this hard coded shift to EST
         dts = pd.to_datetime(epochs, unit='s')  # - 4*pd.offsets.Hour()
 

piker/ui/_chart.py

@@ -17,7 +17,7 @@
 """
 High level Qt chart widgets.
 """
-from typing import Tuple, Dict, Any, Optional
+from typing import Tuple, Dict, Any, Optional, Callable
 from functools import partial
 
 from PyQt5 import QtCore, QtGui
@@ -105,6 +105,7 @@ class ChartSpace(QtGui.QWidget):
         self.tf_layout.setContentsMargins(0, 12, 0, 0)
         time_frames = ('1M', '5M', '15M', '30M', '1H', '1D', '1W', 'MN')
         btn_prefix = 'TF'
+
         for tf in time_frames:
             btn_name = ''.join([btn_prefix, tf])
             btn = QtGui.QPushButton(tf)
@@ -112,6 +113,7 @@ class ChartSpace(QtGui.QWidget):
             btn.setEnabled(False)
             setattr(self, btn_name, btn)
             self.tf_layout.addWidget(btn)
+
         self.toolbar_layout.addLayout(self.tf_layout)
 
     # XXX: strat loader/saver that we don't need yet.
@@ -126,6 +128,8 @@ class ChartSpace(QtGui.QWidget):
         ohlc: bool = True,
     ) -> None:
         """Load a new contract into the charting app.
+
+        Expects a ``numpy`` structured array containing all the ohlcv fields.
         """
         # XXX: let's see if this causes mem problems
         self.window.setWindowTitle(f'piker chart {symbol}')
@@ -148,7 +152,8 @@ class ChartSpace(QtGui.QWidget):
         if not self.v_layout.isEmpty():
             self.v_layout.removeWidget(linkedcharts)
 
-        main_chart = linkedcharts.plot_main(s, data, ohlc=ohlc)
+        main_chart = linkedcharts.plot_ohlc_main(s, data)
+
         self.v_layout.addWidget(linkedcharts)
 
         return linkedcharts, main_chart
@@ -176,7 +181,6 @@ class LinkedSplitCharts(QtGui.QWidget):
     def __init__(self):
         super().__init__()
         self.signals_visible: bool = False
-        self._array: np.ndarray = None  # main data source
         self._ch: CrossHair = None  # crosshair graphics
         self.chart: ChartPlotWidget = None  # main (ohlc) chart
         self.subplots: Dict[Tuple[str, ...], ChartPlotWidget] = {}
@@ -212,20 +216,18 @@ class LinkedSplitCharts(QtGui.QWidget):
         sizes.extend([min_h_ind] * len(self.subplots))
         self.splitter.setSizes(sizes)  # , int(self.height()*0.2)
 
-    def plot_main(
+    def plot_ohlc_main(
         self,
         symbol: Symbol,
         array: np.ndarray,
-        ohlc: bool = True,
+        style: str = 'bar',
     ) -> 'ChartPlotWidget':
         """Start up and show main (price) chart and all linked subcharts.
+
+        The data input struct array must include OHLC fields.
         """
         self.digits = symbol.digits()
 
-        # TODO: this should eventually be a view onto shared mem or some
-        # higher level type / API
-        self._array = array
-
         # add crosshairs
         self._ch = CrossHair(
             linkedsplitcharts=self,
@@ -235,11 +237,13 @@ class LinkedSplitCharts(QtGui.QWidget):
             name=symbol.key,
             array=array,
             xaxis=self.xaxis,
-            ohlc=ohlc,
+            style=style,
             _is_main=True,
         )
         # add crosshair graphic
         self.chart.addItem(self._ch)
+
+        # axis placement
         if _xaxis_at == 'bottom':
             self.chart.hideAxis('bottom')
 
@@ -253,7 +257,7 @@ class LinkedSplitCharts(QtGui.QWidget):
         name: str,
         array: np.ndarray,
         xaxis: DynamicDateAxis = None,
-        ohlc: bool = False,
+        style: str = 'line',
         _is_main: bool = False,
         **cpw_kwargs,
     ) -> 'ChartPlotWidget':
@@ -263,7 +267,7 @@ class LinkedSplitCharts(QtGui.QWidget):
         """
         if self.chart is None and not _is_main:
             raise RuntimeError(
-                "A main plot must be created first with `.plot_main()`")
+                "A main plot must be created first with `.plot_ohlc_main()`")
 
         # source of our custom interactions
         cv = ChartView()
@@ -277,6 +281,11 @@ class LinkedSplitCharts(QtGui.QWidget):
             )
 
         cpw = ChartPlotWidget(
+
+            # this name will be used to register the primary
+            # graphics curve managed by the subchart
+            name=name,
+
             array=array,
             parent=self.splitter,
             axisItems={
@@ -287,11 +296,12 @@ class LinkedSplitCharts(QtGui.QWidget):
             cursor=self._ch,
             **cpw_kwargs,
         )
+
+        # give viewbox a reference to primary chart
+        # allowing for kb controls and interactions
+        # (see our custom view in `._interactions.py`)
         cv.chart = cpw
 
-        # this name will be used to register the primary
-        # graphics curve managed by the subchart
-        cpw.name = name
         cpw.plotItem.vb.linked_charts = self
         cpw.setFrameStyle(QtGui.QFrame.StyledPanel)  # | QtGui.QFrame.Plain)
         cpw.hideButtons()
@@ -305,11 +315,15 @@ class LinkedSplitCharts(QtGui.QWidget):
         self._ch.add_plot(cpw)
 
         # draw curve graphics
-        if ohlc:
+        if style == 'bar':
             cpw.draw_ohlc(name, array)
-        else:
+
+        elif style == 'line':
             cpw.draw_curve(name, array)
 
+        else:
+            raise ValueError(f"Chart style {style} is currently unsupported")
+
         if not _is_main:
             # track by name
             self.subplots[name] = cpw
@@ -319,6 +333,8 @@ class LinkedSplitCharts(QtGui.QWidget):
 
             # XXX: we need this right?
             # self.splitter.addWidget(cpw)
+        else:
+            assert style == 'bar', 'main chart must be OHLC'
 
         return cpw
 
@@ -344,6 +360,7 @@ class ChartPlotWidget(pg.PlotWidget):
     def __init__(
         self,
         # the data view we generate graphics from
+        name: str,
         array: np.ndarray,
         static_yrange: Optional[Tuple[float, float]] = None,
         cursor: Optional[CrossHair] = None,
@@ -356,17 +373,26 @@ class ChartPlotWidget(pg.PlotWidget):
             # parent=None,
             # plotItem=None,
             # antialias=True,
+            useOpenGL=True,
             **kwargs
         )
+
+        self.name = name
+
         # self.setViewportMargins(0, 0, 0, 0)
-        self._array = array  # readonly view of data
+        self._ohlc = array  # readonly view of ohlc data
+        self.default_view()
+
         self._arrays = {}  # readonly view of overlays
         self._graphics = {}  # registry of underlying graphics
-        self._overlays = {}  # registry of overlay curves
+        self._overlays = set()  # registry of overlay curve names
+
         self._labels = {}  # registry of underlying graphics
         self._ysticks = {}  # registry of underlying graphics
+
         self._vb = self.plotItem.vb
         self._static_yrange = static_yrange  # for "known y-range style"
+
         self._view_mode: str = 'follow'
         self._cursor = cursor  # placehold for mouse
 
@@ -377,6 +403,7 @@ class ChartPlotWidget(pg.PlotWidget):
         # show background grid
         self.showGrid(x=True, y=True, alpha=0.5)
 
+        # TODO: stick in config
         # use cross-hair for cursor?
         # self.setCursor(QtCore.Qt.CrossCursor)
 
@@ -391,22 +418,25 @@ class ChartPlotWidget(pg.PlotWidget):
         self._vb.sigResized.connect(self._set_yrange)
 
     def last_bar_in_view(self) -> bool:
-        self._array[-1]['index']
+        self._ohlc[-1]['index']
 
     def update_contents_labels(
         self,
         index: int,
         # array_name: str,
     ) -> None:
-        if index >= 0 and index < len(self._array):
+        if index >= 0 and index < self._ohlc[-1]['index']:
             for name, (label, update) in self._labels.items():
 
-                if name is self.name :
+                if name is self.name:
-                    array = self._array
+                    array = self._ohlc
                 else:
                     array = self._arrays[name]
 
+                try:
                     update(index, array)
+                except IndexError:
+                    log.exception(f"Failed to update label: {name}")
 
     def _set_xlimits(
         self,
@@ -430,8 +460,11 @@ class ChartPlotWidget(pg.PlotWidget):
         """Return a range tuple for the bars present in view.
         """
         l, r = self.view_range()
-        lbar = max(l, 0)
+        a = self._ohlc
-        rbar = min(r, len(self._array))
+        lbar = max(l, a[0]['index'])
+        rbar = min(r, a[-1]['index'])
+        # lbar = max(l, 0)
+        # rbar = min(r, len(self._ohlc))
         return l, lbar, rbar, r
 
     def default_view(
@@ -441,7 +474,8 @@ class ChartPlotWidget(pg.PlotWidget):
         """Set the view box to the "default" startup view of the scene.
 
         """
-        xlast = self._array[index]['index']
+        xlast = self._ohlc[index]['index']
+        print(xlast)
         begin = xlast - _bars_to_left_in_follow_mode
         end = xlast + _bars_from_right_in_follow_mode
 
@@ -462,7 +496,7 @@ class ChartPlotWidget(pg.PlotWidget):
         self._vb.setXRange(
             min=l + 1,
             max=r + 1,
-            # holy shit, wtf dude... why tf would this not be 0 by
+            # TODO: holy shit, wtf dude... why tf would this not be 0 by
             # default... speechless.
             padding=0,
         )
@@ -477,6 +511,7 @@ class ChartPlotWidget(pg.PlotWidget):
         """Draw OHLC datums to chart.
         """
         graphics = style(self.plotItem)
+
         # adds all bar/candle graphics objects for each data point in
         # the np array buffer to be drawn on next render cycle
         self.addItem(graphics)
@@ -486,10 +521,12 @@ class ChartPlotWidget(pg.PlotWidget):
 
         self._graphics[name] = graphics
 
-        label = ContentsLabel(chart=self, anchor_at=('top', 'left'))
+        self.add_contents_label(
-        self._labels[name] = (label, partial(label.update_from_ohlc, name))
+            name,
-        label.show()
+            anchor_at=('top', 'left'),
-        self.update_contents_labels(len(data) - 1) #, name)
+            update_func=ContentsLabel.update_from_ohlc,
+        )
+        self.update_contents_labels(len(data) - 1)
 
         self._add_sticky(name)
 
@@ -500,49 +537,76 @@ class ChartPlotWidget(pg.PlotWidget):
         name: str,
         data: np.ndarray,
         overlay: bool = False,
+        color: str = 'default_light',
+        add_label: bool = True,
         **pdi_kwargs,
     ) -> pg.PlotDataItem:
-        # draw the indicator as a plain curve
+        """Draw a "curve" (line plot graphics) for the provided data in
+        the input array ``data``.
+
+        """
         _pdi_defaults = {
-            'pen': pg.mkPen(hcolor('default_light')),
+            'pen': pg.mkPen(hcolor(color)),
         }
         pdi_kwargs.update(_pdi_defaults)
 
         curve = pg.PlotDataItem(
-            data[name],
+            y=data[name],
+            x=data['index'],
             # antialias=True,
             name=name,
+
             # TODO: see how this handles with custom ohlcv bars graphics
-            clipToView=True,
+            # and/or if we can implement something similar for OHLC graphics
+            # clipToView=True,
+            autoDownsample=True,
+            downsampleMethod='subsample',
+
             **pdi_kwargs,
         )
         self.addItem(curve)
 
-        # register overlay curve with name
+        # register curve graphics and backing array for name
         self._graphics[name] = curve
-
-        if overlay:
-            anchor_at = ('bottom', 'right')
-            self._overlays[name] = curve
         self._arrays[name] = data
 
+        if overlay:
+            anchor_at = ('bottom', 'left')
+            self._overlays.add(name)
+
         else:
-            anchor_at = ('top', 'right')
+            anchor_at = ('top', 'left')
 
             # TODO: something instead of stickies for overlays
             # (we need something that avoids clutter on x-axis).
             self._add_sticky(name, bg_color='default_light')
 
-        label = ContentsLabel(chart=self, anchor_at=anchor_at)
+        if add_label:
-        self._labels[name] = (label, partial(label.update_from_value, name))
+            self.add_contents_label(name, anchor_at=anchor_at)
-        label.show()
+            self.update_contents_labels(len(data) - 1)
-        self.update_contents_labels(len(data) - 1) #, name)
 
         if self._cursor:
             self._cursor.add_curve_cursor(self, curve)
 
         return curve
 
+    def add_contents_label(
+        self,
+        name: str,
+        anchor_at: Tuple[str, str] = ('top', 'left'),
+        update_func: Callable = ContentsLabel.update_from_value,
+    ) -> ContentsLabel:
+
+        label = ContentsLabel(chart=self, anchor_at=anchor_at)
+        self._labels[name] = (
+            # calls class method on instance
+            label,
+            partial(update_func, label, name)
+        )
+        label.show()
+
+        return label
+
     def _add_sticky(
         self,
         name: str,
@@ -569,7 +633,7 @@ class ChartPlotWidget(pg.PlotWidget):
         """Update the named internal graphics from ``array``.
 
         """
-        self._array = array
+        self._ohlc = array
         graphics = self._graphics[name]
         graphics.update_from_array(array, **kwargs)
         return graphics
@@ -584,14 +648,18 @@ class ChartPlotWidget(pg.PlotWidget):
 
         """
         if name not in self._overlays:
-            self._array = array
+            self._ohlc = array
         else:
             self._arrays[name] = array
 
         curve = self._graphics[name]
+
         # TODO: we should instead implement a diff based
-        # "only update with new items" on the pg.PlotDataItem
+        # "only update with new items" on the pg.PlotCurveItem
-        curve.setData(array[name], **kwargs)
+        # one place to dig around this might be the `QBackingStore`
+        # https://doc.qt.io/qt-5/qbackingstore.html
+        curve.setData(y=array[name], x=array['index'], **kwargs)
+
         return curve
 
     def _set_yrange(
@@ -625,8 +693,9 @@ class ChartPlotWidget(pg.PlotWidget):
 
             # TODO: logic to check if end of bars in view
             extra = view_len - _min_points_to_show
-            begin = 0 - extra
+            begin = self._ohlc[0]['index'] - extra
-            end = len(self._array) - 1 + extra
+            # end = len(self._ohlc) - 1 + extra
+            end = self._ohlc[-1]['index'] - 1 + extra
 
             # XXX: test code for only rendering lines for the bars in view.
             # This turns out to be very very poor perf when scaling out to
@@ -642,10 +711,15 @@ class ChartPlotWidget(pg.PlotWidget):
             #     f"view_len: {view_len}, bars_len: {bars_len}\n"
             #     f"begin: {begin}, end: {end}, extra: {extra}"
             # )
-            self._set_xlimits(begin, end)
+            # self._set_xlimits(begin, end)
 
             # TODO: this should be some kind of numpy view api
-            bars = self._array[lbar:rbar]
+            # bars = self._ohlc[lbar:rbar]
+
+            a = self._ohlc
+            ifirst = a[0]['index']
+            bars = a[lbar - ifirst:rbar - ifirst]
+
             if not len(bars):
                 # likely no data loaded yet or extreme scrolling?
                 log.error(f"WTF bars_range = {lbar}:{rbar}")
@@ -731,10 +805,6 @@ async def _async_main(
 
     # chart_app.init_search()
 
-    # XXX: bug zone if you try to ctl-c after this we get hangs again?
-    # wtf...
-    # await tractor.breakpoint()
-
     # historical data fetch
     brokermod = brokers.get_brokermod(brokername)
 
@@ -747,30 +817,28 @@ async def _async_main(
         ohlcv = feed.shm
         bars = ohlcv.array
 
-        # TODO: when we start messing with line charts
-        # c = np.zeros(len(bars), dtype=[
-        #     (sym, bars.dtype.fields['close'][0]),
-        #     ('index', 'i4'),
-        # ])
-        # c[sym] = bars['close']
-        # c['index'] = bars['index']
-        # linked_charts, chart = chart_app.load_symbol(sym, c, ohlc=False)
-
         # load in symbol's ohlc data
+        # await tractor.breakpoint()
         linked_charts, chart = chart_app.load_symbol(sym, bars)
 
         # plot historical vwap if available
-        vwap_in_history = False
+        wap_in_history = False
-        if 'vwap' in bars.dtype.fields:
+
-            vwap_in_history = True
+        if brokermod._show_wap_in_history:
+
+            if 'bar_wap' in bars.dtype.fields:
+                wap_in_history = True
                 chart.draw_curve(
-                name='vwap',
+                    name='bar_wap',
                     data=bars,
-                overlay=True,
+                    add_label=False,
                 )
 
         chart._set_yrange()
 
+        # TODO: a data view api that makes this less shit
+        chart._shm = ohlcv
+
         # eventually we'll support some kind of n-compose syntax
         fsp_conf = {
             'vwap': {
@@ -799,19 +867,13 @@ async def _async_main(
                 loglevel,
             )
 
-            # update last price sticky
-            last_price_sticky = chart._ysticks[chart.name]
-            last_price_sticky.update_from_data(
-                *ohlcv.array[-1][['index', 'close']]
-            )
-
             # start graphics update loop(s)after receiving first live quote
             n.start_soon(
                 chart_from_quotes,
                 chart,
                 feed.stream,
                 ohlcv,
-                vwap_in_history,
+                wap_in_history,
             )
 
             # wait for a first quote before we start any update tasks
@@ -834,7 +896,7 @@ async def chart_from_quotes(
     chart: ChartPlotWidget,
     stream,
     ohlcv: np.ndarray,
-    vwap_in_history: bool = False,
+    wap_in_history: bool = False,
 ) -> None:
     """The 'main' (price) chart real-time update loop.
 
@@ -847,29 +909,40 @@ async def chart_from_quotes(
     # - update last open price correctly instead
     #   of copying it from last bar's close
     # - 5 sec bar lookback-autocorrection like tws does?
+
+    # update last price sticky
     last_price_sticky = chart._ysticks[chart.name]
+    last_price_sticky.update_from_data(
+        *ohlcv.array[-1][['index', 'close']]
+    )
 
     def maxmin():
         # TODO: implement this
         # https://arxiv.org/abs/cs/0610046
         # https://github.com/lemire/pythonmaxmin
 
-        array = chart._array
+        array = chart._ohlc
+        ifirst = array[0]['index']
+
         last_bars_range = chart.bars_range()
         l, lbar, rbar, r = last_bars_range
-        in_view = array[lbar:rbar]
+        in_view = array[lbar - ifirst:rbar - ifirst]
+
+        assert in_view.size
+
         mx, mn = np.nanmax(in_view['high']), np.nanmin(in_view['low'])
 
-        # TODO: when we start using line charts
+        # TODO: when we start using line charts, probably want to make
+        # this an overloaded call on our `DataView
         # sym = chart.name
         # mx, mn = np.nanmax(in_view[sym]), np.nanmin(in_view[sym])
 
         return last_bars_range, mx, mn
 
-    last_bars_range, last_mx, last_mn = maxmin()
-
     chart.default_view()
 
+    last_bars_range, last_mx, last_mn = maxmin()
+
     last, volume = ohlcv.array[-1][['close', 'volume']]
 
     l1 = L1Labels(
@@ -889,7 +962,6 @@ async def chart_from_quotes(
 
     async for quotes in stream:
         for sym, quote in quotes.items():
-            # print(f'CHART: {quote}')
 
             for tick in quote.get('ticks', ()):
 
@@ -898,7 +970,14 @@ async def chart_from_quotes(
                 price = tick.get('price')
                 size = tick.get('size')
 
-                if ticktype in ('trade', 'utrade'):
+                # compute max and min trade values to display in view
+                # TODO: we need a streaming minmax algorithm here, see
+                # def above.
+                brange, mx_in_view, mn_in_view = maxmin()
+                l, lbar, rbar, r = brange
+
+                if ticktype in ('trade', 'utrade', 'last'):
+
                     array = ohlcv.array
 
                     # update price sticky(s)
@@ -907,25 +986,16 @@ async def chart_from_quotes(
                         *last[['index', 'close']]
                     )
 
+                    # plot bars
                     # update price bar
                     chart.update_ohlc_from_array(
                         chart.name,
                         array,
                     )
 
-                    # chart.update_curve_from_array(
+                    if wap_in_history:
-                        # chart.name,
+                        # update vwap overlay line
-                        # TODO: when we start using line charts
+                        chart.update_curve_from_array('bar_wap', ohlcv.array)
-                        # np.array(array['close'], dtype=[(chart.name, 'f8')])
-
-                    # if vwap_in_history:
-                    #     # update vwap overlay line
-                    #     chart.update_curve_from_array('vwap', ohlcv.array)
-
-                # compute max and min trade values to display in view
-                # TODO: we need a streaming minmax algorithm here, see
-                # def above.
-                brange, mx_in_view, mn_in_view = maxmin()
 
                 # XXX: prettty sure this is correct?
                 # if ticktype in ('trade', 'last'):
@@ -1021,12 +1091,14 @@ async def spawn_fsps(
 
                 # spawn closure, can probably define elsewhere
                 async def spawn_fsp_daemon(
-                    fsp_name,
+                    fsp_name: str,
-                    conf,
+                    display_name: str,
+                    conf: dict,
                 ):
                     """Start an fsp subactor async.
 
                     """
+                    print(f'FSP NAME: {fsp_name}')
                     portal = await n.run_in_actor(
 
                         # name as title of sub-chart
@@ -1057,6 +1129,7 @@ async def spawn_fsps(
                 ln.start_soon(
                     spawn_fsp_daemon,
                     fsp_func_name,
+                    display_name,
                     conf,
                 )
 
@@ -1081,6 +1154,8 @@ async def update_signals(
 ) -> None:
     """FSP stream chart update loop.
 
+    This is called once for each entry in the fsp
+    config map.
     """
     shm = conf['shm']
 
@@ -1094,6 +1169,7 @@ async def update_signals(
         last_val_sticky = None
 
     else:
+
         chart = linked_charts.add_plot(
             name=fsp_func_name,
             array=shm.array,
@@ -1112,6 +1188,7 @@ async def update_signals(
             # fsp_func_name
         )
 
+        # read last value
         array = shm.array
         value = array[fsp_func_name][-1]
 
@@ -1119,7 +1196,8 @@ async def update_signals(
         last_val_sticky.update_from_data(-1, value)
 
         chart.update_curve_from_array(fsp_func_name, array)
-        chart.default_view()
+
+        chart._shm = shm
 
     # TODO: figure out if we can roll our own `FillToThreshold` to
     # get brush filled polygons for OS/OB conditions.
@@ -1132,23 +1210,42 @@ async def update_signals(
     # graphics.curve.setFillLevel(50)
 
     # add moveable over-[sold/bought] lines
-    level_line(chart, 30)
+    # and labels only for the 70/30 lines
-    level_line(chart, 70, orient_v='top')
+    level_line(chart, 20, show_label=False)
+    level_line(chart, 30, orient_v='top')
+    level_line(chart, 70, orient_v='bottom')
+    level_line(chart, 80, orient_v='top', show_label=False)
 
-    chart._shm = shm
     chart._set_yrange()
 
     stream = conf['stream']
 
     # update chart graphics
     async for value in stream:
-        # p = pg.debug.Profiler(disabled=False, delayed=False)
+
+        # TODO: provide a read sync mechanism to avoid this polling.
+        # the underlying issue is that a backfill and subsequent shm
+        # array first/last index update could result in an empty array
+        # read here since the stream is never torn down on the
+        # re-compute steps.
+        read_tries = 2
+        while read_tries > 0:
+
+            try:
+                # read last
                 array = shm.array
                 value = array[-1][fsp_func_name]
+                break
+
+            except IndexError:
+                read_tries -= 1
+                continue
+
         if last_val_sticky:
             last_val_sticky.update_from_data(-1, value)
+
+        # update graphics
         chart.update_curve_from_array(fsp_func_name, array)
-        # p('rendered rsi datum')
 
 
 async def check_for_new_bars(feed, ohlcv, linked_charts):
@@ -1199,7 +1296,7 @@ async def check_for_new_bars(feed, ohlcv, linked_charts):
         # resize view
         # price_chart._set_yrange()
 
-        for name, curve in price_chart._overlays.items():
+        for name in price_chart._overlays:
 
             price_chart.update_curve_from_array(
                 name,
@@ -1207,15 +1304,16 @@ async def check_for_new_bars(feed, ohlcv, linked_charts):
             )
 
             # # TODO: standard api for signal lookups per plot
-            # if name in price_chart._array.dtype.fields:
+            # if name in price_chart._ohlc.dtype.fields:
 
             #     # should have already been incremented above
-            #     price_chart.update_curve_from_array(name, price_chart._array)
+            #     price_chart.update_curve_from_array(name, price_chart._ohlc)
 
         for name, chart in linked_charts.subplots.items():
             chart.update_curve_from_array(chart.name, chart._shm.array)
             # chart._set_yrange()
 
+        # shift the view if in follow mode
         price_chart.increment_view()
 
 

piker/ui/_exec.py

@@ -20,6 +20,8 @@ Trio - Qt integration
 Run ``trio`` in guest mode on top of the Qt event loop.
 All global Qt runtime settings are mostly defined here.
 """
+import os
+import signal
 from functools import partial
 import traceback
 from typing import Tuple, Callable, Dict, Any
@@ -74,11 +76,16 @@ class MainWindow(QtGui.QMainWindow):
         self.setMinimumSize(*self.size)
         self.setWindowTitle(self.title)
 
-    def closeEvent(self, event: 'QCloseEvent') -> None:
+    def closeEvent(
+        self,
+        event: 'QCloseEvent'
+    ) -> None:
         """Cancel the root actor asap.
 
         """
-        tractor.current_actor().cancel_soon()
+        # raising KBI seems to get intercepted by by Qt so just use the
+        # system.
+        os.kill(os.getpid(), signal.SIGINT)
 
 
 def run_qtractor(
@@ -128,10 +135,14 @@ def run_qtractor(
 
     def done_callback(outcome):
 
-        print(f"Outcome: {outcome}")
-
         if isinstance(outcome, Error):
             exc = outcome.error
+
+            if isinstance(outcome.error, KeyboardInterrupt):
+                # make it kinda look like ``trio``
+                print("Terminated!")
+
+            else:
                 traceback.print_exception(type(exc), exc, exc.__traceback__)
 
         app.quit()
@@ -144,9 +155,6 @@ def run_qtractor(
     instance = main_widget()
     instance.window = window
 
-    # kill the app when root actor terminates
-    tractor._actor._lifetime_stack.callback(app.quit)
-
     widgets = {
         'window': window,
         'main': instance,
@@ -170,6 +178,7 @@ def run_qtractor(
         main,
         run_sync_soon_threadsafe=run_sync_soon_threadsafe,
         done_callback=done_callback,
+        # restrict_keyboard_interrupt_to_checkpoints=True,
     )
 
     window.main_widget = main_widget

piker/ui/_graphics.py

@@ -17,7 +17,7 @@
 """
 Chart graphics for displaying a slew of different data types.
 """
-
+import inspect
 from typing import List, Optional, Tuple
 
 import numpy as np
@@ -104,7 +104,7 @@ class LineDot(pg.CurvePoint):
         # first = x[0]
         # i = index - first
         i = index - x[0]
-        if i > 0:
+        if i > 0 and i < len(y):
             newPos = (index, y[i])
             QtGui.QGraphicsItem.setPos(self, *newPos)
             return True
@@ -123,9 +123,8 @@ _corner_margins = {
     ('top', 'left'): (-4, -5),
     ('top', 'right'): (4, -5),
 
-    # TODO: pretty sure y here needs to be 2x font height
+    ('bottom', 'left'): (-4, lambda font_size: font_size * 2),
-    ('bottom', 'left'): (-4, 14), 
+    ('bottom', 'right'): (4, lambda font_size: font_size * 2),
-    ('bottom', 'right'): (4, 14),
 }
 
 
@@ -142,7 +141,10 @@ class ContentsLabel(pg.LabelItem):
         font_size: Optional[int] = None,
     ) -> None:
         font_size = font_size or _font.font.pixelSize()
-        super().__init__(justify=justify_text, size=f'{str(font_size)}px')
+        super().__init__(
+            justify=justify_text,
+            size=f'{str(font_size)}px'
+        )
 
         # anchor to viewbox
         self.setParentItem(chart._vb)
@@ -153,6 +155,10 @@ class ContentsLabel(pg.LabelItem):
         index = (_corner_anchors[h], _corner_anchors[v])
         margins = _corner_margins[(v, h)]
 
+        ydim = margins[1]
+        if inspect.isfunction(margins[1]):
+            margins = margins[0], ydim(font_size)
+
         self.anchor(itemPos=index, parentPos=index, offset=margins)
 
     def update_from_ohlc(
@@ -411,7 +417,6 @@ def lines_from_ohlc(row: np.ndarray, w: float) -> Tuple[QLineF]:
     return [hl, o, c]
 
 
-@timeit
 @jit(
     # TODO: for now need to construct this manually for readonly arrays, see
     # https://github.com/numba/numba/issues/4511
@@ -483,7 +488,7 @@ def path_arrays_from_ohlc(
     return x, y, c
 
 
-@timeit
+# @timeit
 def gen_qpath(
     data,
     start,  # XXX: do we need this?
@@ -491,6 +496,8 @@ def gen_qpath(
 ) -> QtGui.QPainterPath:
 
     x, y, c = path_arrays_from_ohlc(data, start, bar_gap=w)
+
+    # TODO: numba the internals of this!
     return pg.functions.arrayToQPath(x, y, connect=c)
 
 
@@ -514,7 +521,6 @@ class BarItems(pg.GraphicsObject):
         super().__init__()
 
         self.last_bar = QtGui.QPicture()
-        # self.history = QtGui.QPicture()
 
         self.path = QtGui.QPainterPath()
         # self._h_path = QtGui.QGraphicsPathItem(self.path)
@@ -537,7 +543,7 @@ class BarItems(pg.GraphicsObject):
         self.start_index: int = 0
         self.stop_index: int = 0
 
-    @timeit
+    # @timeit
     def draw_from_data(
         self,
         data: np.ndarray,
@@ -594,18 +600,6 @@ class BarItems(pg.GraphicsObject):
         p.end()
 
     # @timeit
-    # def draw_history(self) -> None:
-    #     # TODO: avoid having to use a ```QPicture` to calc the
-    #     # ``.boundingRect()``, use ``QGraphicsPathItem`` instead?
-    #     # https://doc.qt.io/qt-5/qgraphicspathitem.html
-    #     # self._h_path.setPath(self.path)
-
-    #     p = QtGui.QPainter(self.history)
-    #     p.setPen(self.bars_pen)
-    #     p.drawPath(self.path)
-    #     p.end()
-
-    @timeit
     def update_from_array(
         self,
         array: np.ndarray,
@@ -636,26 +630,19 @@ class BarItems(pg.GraphicsObject):
         # only drawing as many bars as exactly specified.
 
         if prepend_length:
-            # breakpoint()
+
             # new history was added and we need to render a new path
             new_bars = array[:prepend_length]
             prepend_path = gen_qpath(new_bars, 0, self.w)
 
-            # XXX: SOMETHING IS FISHY HERE what with the old_path
+            # XXX: SOMETHING IS MAYBE FISHY HERE what with the old_path
             # y value not matching the first value from
             # array[prepend_length + 1] ???
 
             # update path
             old_path = self.path
             self.path = prepend_path
-            # self.path.moveTo(float(index - self.w), float(new_bars[0]['open']))
-            # self.path.moveTo(
-            #     float(istart - self.w),
-            #     # float(array[prepend_length + 1]['open'])
-            #     float(array[prepend_length]['open'])
-            # )
             self.path.addPath(old_path)
-            # self.draw_history()
 
         if append_length:
             # generate new lines objects for updatable "current bar"
@@ -672,45 +659,8 @@ class BarItems(pg.GraphicsObject):
             self.path.moveTo(float(istop - self.w), float(new_bars[0]['open']))
             self.path.addPath(append_path)
 
-            # self.draw_history()
-
         self._xrange = first_index, last_index
 
-        # if extra > 0:
-        #     index = array['index']
-        #     first, last = index[0], indext[-1]
-
-        #     # if first < self.start_index:
-        #     #     length = self.start_index - first
-        #     #     prepend_path = gen_qpath(array[:sef:
-
-        #     # generate new lines objects for updatable "current bar"
-        #     self._last_bar_lines = lines_from_ohlc(array[-1], self.w)
-        #     self.draw_last_bar()
-
-        #     # generate new graphics to match provided array
-        #     # path appending logic:
-        #     # we need to get the previous "current bar(s)" for the time step
-        #     # and convert it to a sub-path to append to the historical set
-        #     new_history_istart = length - 2
-
-        #     to_history = array[new_history_istart:new_history_istart + extra]
-
-        #     new_history_qpath = gen_qpath(to_history, 0, self.w)
-
-        #     # move to position of placement for the next bar in history
-        #     # and append new sub-path
-        #     new_bars = array[index:index + extra]
-
-        #     # x, y coordinates for start of next open/left arm
-        #     self.path.moveTo(float(index - self.w), float(new_bars[0]['open']))
-
-        #     self.path.addPath(new_history_qpath)
-
-        #     self.start_index += extra
-
-        # self.draw_history()
-
         if just_history:
             self.update()
             return
@@ -751,7 +701,7 @@ class BarItems(pg.GraphicsObject):
         self.draw_last_bar()
         self.update()
 
-    @timeit
+    # @timeit
     def paint(self, p, opt, widget):
 
         # profiler = pg.debug.Profiler(disabled=False, delayed=False)
@@ -767,13 +717,9 @@ class BarItems(pg.GraphicsObject):
         # as is necesarry for what's in "view". Not sure if this will
         # lead to any perf gains other then when zoomed in to less bars
         # in view.
-        # p.drawPicture(0, 0, self.history)
         p.drawPicture(0, 0, self.last_bar)
 
         p.setPen(self.bars_pen)
-
-        # TODO: does it matter which we use?
-        # p.drawPath(self._h_path.path())
         p.drawPath(self.path)
 
     # @timeit
@@ -794,7 +740,6 @@ class BarItems(pg.GraphicsObject):
         # compute aggregate bounding rectangle
         lb = self.last_bar.boundingRect()
         hb = self.path.boundingRect()
-        # hb = self._h_path.boundingRect()
 
         return QtCore.QRectF(
             # top left

piker/ui/_style.py

@@ -29,8 +29,8 @@ from ..log import get_logger
 log = get_logger(__name__)
 
 # chart-wide fonts specified in inches
-_default_font_inches_we_like = 0.0666
+_default_font_inches_we_like = 6 / 96
-_down_2_font_inches_we_like = 6 / 96
+_down_2_font_inches_we_like = 5 / 96
 
 
 class DpiAwareFont: