Merge pull request #130 from pikers/to_qpainterpath_and_beyond

To qpainterpath and beyond

piker/brokers/ib.py

@@ -21,9 +21,10 @@ Note the client runs under an ``asyncio`` loop (since ``ib_insync`` is
 built on it) and thus actor aware API calls must be spawned with
 ``infected_aio==True``.
 """
-from contextlib import asynccontextmanager, contextmanager
+from contextlib import asynccontextmanager
 from dataclasses import asdict
 from functools import partial
+from datetime import datetime
 from typing import List, Dict, Any, Tuple, Optional, AsyncIterator, Callable
 import asyncio
 import logging
@@ -32,6 +33,7 @@ import itertools
 import time
 
 from async_generator import aclosing
+from ib_insync.wrapper import RequestError
 from ib_insync.contract import Contract, ContractDetails
 from ib_insync.ticker import Ticker
 import ib_insync as ibis
@@ -45,7 +47,7 @@ from ..data import (
     maybe_spawn_brokerd,
     iterticks,
     attach_shm_array,
-    get_shm_token,
+    # get_shm_token,
     subscribe_ohlc_for_increment,
 )
 from ..data._source import from_df
@@ -86,6 +88,8 @@ _time_frames = {
     'Y': 'OneYear',
 }
 
+_show_wap_in_history = False
+
 
 # overrides to sidestep pretty questionable design decisions in
 # ``ib_insync``:
@@ -128,6 +132,8 @@ _adhoc_cmdty_data_map = {
     'XAUUSD': ({'conId': 69067924}, {'whatToShow': 'MIDPOINT'}),
 }
 
+_enters = 0
+
 
 class Client:
     """IB wrapped for our broker backend API.
@@ -142,32 +148,54 @@ class Client:
         self.ib = ib
         self.ib.RaiseRequestErrors = True
 
+        # NOTE: the ib.client here is "throttled" to 45 rps by default
+
     async def bars(
         self,
         symbol: str,
         # EST in ISO 8601 format is required... below is EPOCH
-        start_date: str = "1970-01-01T00:00:00.000000-05:00",
+        start_dt: str = "1970-01-01T00:00:00.000000-05:00",
-        time_frame: str = '1m',
+        end_dt: str = "",
-        count: int = int(2e3),  # <- max allowed per query
+
-        is_paid_feed: bool = False,
+        sample_period_s: str = 1,  # ohlc sample period
+        period_count: int = int(2e3),  # <- max per 1s sample query
+
+        is_paid_feed: bool = False,  # placeholder
     ) -> List[Dict[str, Any]]:
         """Retreive OHLCV bars for a symbol over a range to the present.
         """
         bars_kwargs = {'whatToShow': 'TRADES'}
 
+        global _enters
+        print(f'ENTER BARS {_enters}')
+        _enters += 1
+
         contract = await self.find_contract(symbol)
         bars_kwargs.update(getattr(contract, 'bars_kwargs', {}))
 
         # _min = min(2000*100, count)
         bars = await self.ib.reqHistoricalDataAsync(
             contract,
-            endDateTime='',
+            endDateTime=end_dt,
-            # durationStr='60 S',
+
-            # durationStr='1 D',
+            # time history length values format:
+            # ``durationStr=integer{SPACE}unit (S|D|W|M|Y)``
+
+            # OHLC sampling values:
+            # 1 secs, 5 secs, 10 secs, 15 secs, 30 secs, 1 min, 2 mins,
+            # 3 mins, 5 mins, 10 mins, 15 mins, 20 mins, 30 mins,
+            # 1 hour, 2 hours, 3 hours, 4 hours, 8 hours, 1 day, 1W, 1M
+            # barSizeSetting='1 secs',
+
+            # durationStr='{count} S'.format(count=15000 * 5),
+            # durationStr='{count} D'.format(count=1),
+            # barSizeSetting='5 secs',
+
+            durationStr='{count} S'.format(count=period_count),
+            barSizeSetting='1 secs',
+
+            # barSizeSetting='1 min',
 
-            # time length calcs
-            durationStr='{count} S'.format(count=5000 * 5),
-            barSizeSetting='5 secs',
 
             # always use extended hours
             useRTH=False,
@@ -181,9 +209,13 @@ class Client:
             # TODO: raise underlying error here
             raise ValueError(f"No bars retreived for {symbol}?")
 
+        # TODO: rewrite this faster with ``numba``
         # convert to pandas dataframe:
         df = ibis.util.df(bars)
-        return from_df(df)
+        return bars, from_df(df)
+
+    def onError(self, reqId, errorCode, errorString, contract) -> None:
+        breakpoint()
 
     async def search_stocks(
         self,
@@ -237,6 +269,8 @@ class Client:
         """Get an unqualifed contract for the current "continous" future.
         """
         contcon = ibis.ContFuture(symbol, exchange=exchange)
+
+        # it's the "front" contract returned here
         frontcon = (await self.ib.qualifyContractsAsync(contcon))[0]
         return ibis.Future(conId=frontcon.conId)
 
@@ -279,10 +313,10 @@ class Client:
 
             if exch in ('PURE', 'TSE'):  # non-yankee
                 currency = 'CAD'
-                if exch in ('PURE',):
+                if exch in ('PURE', 'TSE'):
                     # stupid ib...
+                    primaryExchange = exch
                     exch = 'SMART'
-                    primaryExchange = 'PURE'
 
             con = ibis.Stock(
                 symbol=sym,
@@ -293,10 +327,27 @@ class Client:
         try:
             exch = 'SMART' if not exch else exch
             contract = (await self.ib.qualifyContractsAsync(con))[0]
+
+            head = await self.get_head_time(contract)
+            print(head)
         except IndexError:
             raise ValueError(f"No contract could be found {con}")
         return contract
 
+    async def get_head_time(
+        self,
+        contract: Contract,
+    ) -> datetime:
+        """Return the first datetime stamp for ``contract``.
+
+        """
+        return await self.ib.reqHeadTimeStampAsync(
+            contract,
+            whatToShow='TRADES',
+            useRTH=False,
+            formatDate=2,  # timezone aware UTC datetime
+        )
+
     async def stream_ticker(
         self,
         symbol: str,
@@ -309,7 +360,13 @@ class Client:
         contract = await self.find_contract(symbol)
         ticker: Ticker = self.ib.reqMktData(contract, ','.join(opts))
 
+        # define a simple queue push routine that streams quote packets
+        # to trio over the ``to_trio`` memory channel.
+
         def push(t):
+            """Push quotes to trio task.
+
+            """
             # log.debug(t)
             try:
                 to_trio.send_nowait(t)
@@ -346,9 +403,17 @@ async def _aio_get_client(
     """
     # first check cache for existing client
 
+    # breakpoint()
     try:
-        yield _client_cache[(host, port)]
+        if port:
-    except KeyError:
+            client = _client_cache[(host, port)]
+        else:
+            # grab first cached client
+            client = list(_client_cache.values())[0]
+
+        yield client
+
+    except (KeyError, IndexError):
         # TODO: in case the arbiter has no record
         # of existing brokerd we need to broadcast for one.
 
@@ -359,9 +424,11 @@ async def _aio_get_client(
 
         ib = NonShittyIB()
         ports = _try_ports if port is None else [port]
+
         _err = None
         for port in ports:
             try:
+                log.info(f"Connecting to the EYEBEE on port {port}!")
                 await ib.connectAsync(host, port, clientId=client_id)
                 break
             except ConnectionRefusedError as ce:
@@ -373,6 +440,7 @@ async def _aio_get_client(
         try:
             client = Client(ib)
             _client_cache[(host, port)] = client
+            log.debug(f"Caching client for {(host, port)}")
             yield client
         except BaseException:
             ib.disconnect()
@@ -385,7 +453,6 @@ async def _aio_run_client_method(
     from_trio=None,
     **kwargs,
 ) -> None:
-    log.info("Connecting to the EYEEEEBEEEEE GATEWAYYYYYYY!")
     async with _aio_get_client() as client:
 
         async_meth = getattr(client, meth)
@@ -402,6 +469,9 @@ async def _trio_run_client_method(
     method: str,
     **kwargs,
 ) -> None:
+    """Asyncio entry point to run tasks against the ``ib_insync`` api.
+
+    """
     ca = tractor.current_actor()
     assert ca.is_infected_aio()
 
@@ -530,18 +600,60 @@ def normalize(
 _local_buffer_writers = {}
 
 
-@contextmanager
+@asynccontextmanager
-def activate_writer(key: str):
+async def activate_writer(key: str) -> (bool, trio.Nursery):
     try:
         writer_already_exists = _local_buffer_writers.get(key, False)
+
         if not writer_already_exists:
             _local_buffer_writers[key] = True
 
-        yield writer_already_exists
+            async with trio.open_nursery() as n:
+                yield writer_already_exists, n
+        else:
+            yield writer_already_exists, None
     finally:
         _local_buffer_writers.pop(key, None)
 
 
+async def fill_bars(
+    first_bars,
+    shm,
+    count: int = 21,
+) -> None:
+    """Fill historical bars into shared mem / storage afap.
+
+    TODO: avoid pacing constraints:
+    https://github.com/pikers/piker/issues/128
+
+    """
+    next_dt = first_bars[0].date
+
+    i = 0
+    while i < count:
+
+        try:
+            bars, bars_array = await _trio_run_client_method(
+                method='bars',
+                symbol='.'.join(
+                    (first_bars.contract.symbol, first_bars.contract.exchange)
+                ),
+                end_dt=next_dt,
+
+            )
+            shm.push(bars_array, prepend=True)
+            i += 1
+            next_dt = bars[0].date
+
+        except RequestError as err:
+            # TODO: retreive underlying ``ib_insync`` error~~
+            if err.code == 162:
+                log.exception(
+                    "Data query rate reached: Press `ctrl-alt-f` in TWS")
+
+                await tractor.breakpoint()
+
+
 # TODO: figure out how to share quote feeds sanely despite
 # the wacky ``ib_insync`` api.
 # @tractor.msg.pub
@@ -575,7 +687,9 @@ async def stream_quotes(
 
         # check if a writer already is alive in a streaming task,
         # otherwise start one and mark it as now existing
-        with activate_writer(shm_token['shm_name']) as writer_already_exists:
+        async with activate_writer(
+            shm_token['shm_name']
+        ) as (writer_already_exists, ln):
 
             # maybe load historical ohlcv in to shared mem
             # check if shm has already been created by previous
@@ -588,18 +702,29 @@ async def stream_quotes(
                     # we are the buffer writer
                     readonly=False,
                 )
-                bars = await _trio_run_client_method(
+
+                # async def retrieve_and_push():
+                start = time.time()
+
+                bars, bars_array = await _trio_run_client_method(
                     method='bars',
                     symbol=sym,
+
                 )
 
-                if bars is None:
+                log.info(f"bars_array request: {time.time() - start}")
+
+                if bars_array is None:
                     raise SymbolNotFound(sym)
 
                 # write historical data to buffer
-                shm.push(bars)
+                shm.push(bars_array)
                 shm_token = shm.token
 
+                # TODO: generalize this for other brokers
+                # start bar filler task in bg
+                ln.start_soon(fill_bars, bars, shm)
+
                 times = shm.array['time']
                 delay_s = times[-1] - times[times != times[-1]][-1]
                 subscribe_ohlc_for_increment(shm, delay_s)
@@ -656,6 +781,7 @@ async def stream_quotes(
 
             # real-time stream
             async for ticker in stream:
+                # print(ticker.vwap)
                 quote = normalize(
                     ticker,
                     calc_price=calc_price
@@ -674,6 +800,8 @@ async def stream_quotes(
                     for tick in iterticks(quote, types=('trade', 'utrade',)):
                         last = tick['price']
 
+                        # print(f"{quote['symbol']}: {tick}")
+
                         # update last entry
                         # benchmarked in the 4-5 us range
                         o, high, low, v = shm.array[-1][
@@ -687,7 +815,13 @@ async def stream_quotes(
                             # is also the close/last trade price
                             o = last
 
-                        shm.array[['open', 'high', 'low', 'close', 'volume']][-1] = (
+                        shm.array[[
+                            'open',
+                            'high',
+                            'low',
+                            'close',
+                            'volume',
+                        ]][-1] = (
                             o,
                             max(high, last),
                             min(low, last),

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/data/__init__.py

@@ -42,7 +42,7 @@ from ._sharedmem import (
     ShmArray,
     get_shm_token,
 )
-from ._source import base_ohlc_dtype
+from ._source import base_iohlc_dtype
 from ._buffer import (
     increment_ohlc_buffer,
     subscribe_ohlc_for_increment
@@ -139,6 +139,7 @@ class Feed:
     name: str
     stream: AsyncIterator[Dict[str, Any]]
     shm: ShmArray
+    # ticks: ShmArray
     _broker_portal: tractor._portal.Portal
     _index_stream: Optional[AsyncIterator[Dict[str, Any]]] = None
 
@@ -188,7 +189,7 @@ async def open_feed(
         key=sym_to_shm_key(name, symbols[0]),
 
         # use any broker defined ohlc dtype:
-        dtype=getattr(mod, '_ohlc_dtype', base_ohlc_dtype),
+        dtype=getattr(mod, '_ohlc_dtype', base_iohlc_dtype),
 
         # we expect the sub-actor to write
         readonly=True,

piker/data/_buffer.py

@@ -91,19 +91,20 @@ async def increment_ohlc_buffer(
 
                 # append new entry to buffer thus "incrementing" the bar
                 array = shm.array
-                last = array[-1:].copy()
+                last = array[-1:][shm._write_fields].copy()
-                (index, t, close) = last[0][['index', 'time', 'close']]
+                # (index, t, close) = last[0][['index', 'time', 'close']]
+                (t, close) = last[0][['time', 'close']]
 
                 # this copies non-std fields (eg. vwap) from the last datum
                 last[
-                    ['index', 'time', 'volume', 'open', 'high', 'low', 'close']
+                    ['time', 'volume', 'open', 'high', 'low', 'close']
-                ][0] = (index + 1, t + delay_s, 0, close, close, close, close)
+                ][0] = (t + delay_s, 0, close, close, close, close)
 
                 # write to the buffer
                 shm.push(last)
 
         # broadcast the buffer index step
-        yield {'index': shm._i.value}
+        yield {'index': shm._last.value}
 
 
 def subscribe_ohlc_for_increment(

piker/data/_normalize.py

@@ -33,6 +33,6 @@ def iterticks(
     ticks = quote.get('ticks', ())
     if ticks:
         for tick in ticks:
-            print(f"{quote['symbol']}: {tick}")
+            # print(f"{quote['symbol']}: {tick}")
             if tick.get('type') in types:
                 yield tick

piker/data/_sharedmem.py

@@ -17,11 +17,10 @@
 """
 NumPy compatible shared memory buffers for real-time FSP.
 """
-from typing import List
 from dataclasses import dataclass, asdict
 from sys import byteorder
-from typing import Tuple, Optional
+from typing import List, Tuple, Optional
-from multiprocessing import shared_memory
+from multiprocessing.shared_memory import SharedMemory, _USE_POSIX
 from multiprocessing import resource_tracker as mantracker
 from _posixshmem import shm_unlink
 
@@ -29,7 +28,7 @@ import tractor
 import numpy as np
 
 from ..log import get_logger
-from ._source import base_ohlc_dtype
+from ._source import base_ohlc_dtype, base_iohlc_dtype
 
 
 log = get_logger(__name__)
@@ -58,17 +57,15 @@ mantracker.getfd = mantracker._resource_tracker.getfd
 
 
 class SharedInt:
+    """Wrapper around a single entry shared memory array which
+    holds an ``int`` value used as an index counter.
+
+    """
     def __init__(
         self,
-        token: str,
+        shm: SharedMemory,
-        create: bool = False,
     ) -> None:
-        # create a single entry array for storing an index counter
+        self._shm = shm
-        self._shm = shared_memory.SharedMemory(
-            name=token,
-            create=create,
-            size=4,  # std int
-        )
 
     @property
     def value(self) -> int:
@@ -79,7 +76,7 @@ class SharedInt:
         self._shm.buf[:] = value.to_bytes(4, byteorder)
 
     def destroy(self) -> None:
-        if shared_memory._USE_POSIX:
+        if _USE_POSIX:
             # We manually unlink to bypass all the "resource tracker"
             # nonsense meant for non-SC systems.
             shm_unlink(self._shm.name)
@@ -91,7 +88,8 @@ class _Token:
     which can be used to key a system wide post shm entry.
     """
     shm_name: str  # this servers as a "key" value
-    shm_counter_name: str
+    shm_first_index_name: str
+    shm_last_index_name: str
     dtype_descr: List[Tuple[str]]
 
     def __post_init__(self):
@@ -130,27 +128,47 @@ def _make_token(
     """Create a serializable token that can be used
     to access a shared array.
     """
-    dtype = base_ohlc_dtype if dtype is None else dtype
+    dtype = base_iohlc_dtype if dtype is None else dtype
     return _Token(
         key,
-        key + "_counter",
+        key + "_first",
+        key + "_last",
         np.dtype(dtype).descr
     )
 
 
 class ShmArray:
+    """A shared memory ``numpy`` (compatible) array API.
+
+    An underlying shared memory buffer is allocated based on
+    a user specified ``numpy.ndarray``. This fixed size array
+    can be read and written to by pushing data both onto the "front"
+    or "back" of a set index range. The indexes for the "first" and
+    "last" index are themselves stored in shared memory (accessed via
+    ``SharedInt`` interfaces) values such that multiple processes can
+    interact with the same array using a synchronized-index.
+
+    """
     def __init__(
         self,
         shmarr: np.ndarray,
-        counter: SharedInt,
+        first: SharedInt,
-        shm: shared_memory.SharedMemory,
+        last: SharedInt,
-        readonly: bool = True,
+        shm: SharedMemory,
+        # readonly: bool = True,
     ) -> None:
         self._array = shmarr
-        self._i = counter
+
+        # indexes for first and last indices corresponding
+        # to fille data
+        self._first = first
+        self._last = last
+
         self._len = len(shmarr)
         self._shm = shm
-        self._readonly = readonly
+
+        # pushing data does not write the index (aka primary key)
+        self._write_fields = list(shmarr.dtype.fields.keys())[1:]
 
     # TODO: ringbuf api?
 
@@ -158,24 +176,25 @@ class ShmArray:
     def _token(self) -> _Token:
         return _Token(
             self._shm.name,
-            self._i._shm.name,
+            self._first._shm.name,
+            self._last._shm.name,
             self._array.dtype.descr,
         )
 
     @property
     def token(self) -> dict:
-        """Shared memory token that can be serialized
+        """Shared memory token that can be serialized and used by
-        and used by another process to attach to this array.
+        another process to attach to this array.
         """
         return self._token.as_msg()
 
     @property
     def index(self) -> int:
-        return self._i.value % self._len
+        return self._last.value % self._len
 
     @property
     def array(self) -> np.ndarray:
-        return self._array[:self._i.value]
+        return self._array[self._first.value:self._last.value]
 
     def last(
         self,
@@ -186,38 +205,90 @@ class ShmArray:
     def push(
         self,
         data: np.ndarray,
+        prepend: bool = False,
     ) -> int:
         """Ring buffer like "push" to append data
-        into the buffer and return updated index.
+        into the buffer and return updated "last" index.
         """
         length = len(data)
-        # TODO: use .index for actual ring logic?
+
-        index = self._i.value
+        if prepend:
+            index = self._first.value - length
+        else:
+            index = self._last.value
+
         end = index + length
-        self._array[index:end] = data[:]
+
-        self._i.value = end
+        fields = self._write_fields
-        return end
+
+        try:
+            self._array[fields][index:end] = data[fields][:]
+            if prepend:
+                self._first.value = index
+            else:
+                self._last.value = end
+            return end
+        except ValueError as err:
+            # shoudl raise if diff detected
+            self.diff_err_fields(data)
+
+            raise err
+
+    def diff_err_fields(
+        self,
+        data: np.ndarray,
+    ) -> None:
+        # reraise with any field discrepancy
+        our_fields, their_fields = (
+            set(self._array.dtype.fields),
+            set(data.dtype.fields),
+        )
+
+        only_in_ours = our_fields - their_fields
+        only_in_theirs = their_fields - our_fields
+
+        if only_in_ours:
+            raise TypeError(
+                f"Input array is missing field(s): {only_in_ours}"
+            )
+        elif only_in_theirs:
+            raise TypeError(
+                f"Input array has unknown field(s): {only_in_theirs}"
+            )
+
+    def prepend(
+        self,
+        data: np.ndarray,
+    ) -> int:
+        end = self.push(data, prepend=True)
+        assert end
 
     def close(self) -> None:
-        self._i._shm.close()
+        self._first._shm.close()
+        self._last._shm.close()
         self._shm.close()
 
     def destroy(self) -> None:
-        if shared_memory._USE_POSIX:
+        if _USE_POSIX:
             # We manually unlink to bypass all the "resource tracker"
             # nonsense meant for non-SC systems.
             shm_unlink(self._shm.name)
-        self._i.destroy()
+
+        self._first.destroy()
+        self._last.destroy()
 
     def flush(self) -> None:
         # TODO: flush to storage backend like markestore?
         ...
 
 
+# how  much is probably dependent on lifestyle
+_secs_in_day = int(60 * 60 * 12)
+_default_size = 2 * _secs_in_day
+
 def open_shm_array(
     key: Optional[str] = None,
-    # approx number of 5s bars in a "day" x2
+    size: int = _default_size,
-    size: int = int(2*60*60*10/5),
     dtype: Optional[np.dtype] = None,
     readonly: bool = False,
 ) -> ShmArray:
@@ -229,7 +300,9 @@ def open_shm_array(
     # create new shared mem segment for which we
     # have write permission
     a = np.zeros(size, dtype=dtype)
-    shm = shared_memory.SharedMemory(
+    a['index'] = np.arange(len(a))
+
+    shm = SharedMemory(
         name=key,
         create=True,
         size=a.nbytes
@@ -243,17 +316,30 @@ def open_shm_array(
         dtype=dtype
     )
 
-    counter = SharedInt(
+    # create single entry arrays for storing an first and last indices
-        token=token.shm_counter_name,
+    first = SharedInt(
-        create=True,
+        shm=SharedMemory(
+            name=token.shm_first_index_name,
+            create=True,
+            size=4,  # std int
+        )
     )
-    counter.value = 0
+
+    last = SharedInt(
+        shm=SharedMemory(
+            name=token.shm_last_index_name,
+            create=True,
+            size=4,  # std int
+        )
+    )
+
+    last.value = first.value = int(_secs_in_day)
 
     shmarr = ShmArray(
         array,
-        counter,
+        first,
+        last,
         shm,
-        readonly=readonly,
     )
 
     assert shmarr._token == token
@@ -261,26 +347,31 @@ def open_shm_array(
 
     # "unlink" created shm on process teardown by
     # pushing teardown calls onto actor context stack
-    actor = tractor.current_actor()
+    tractor._actor._lifetime_stack.callback(shmarr.close)
-    actor._lifetime_stack.callback(shmarr.close)
+    tractor._actor._lifetime_stack.callback(shmarr.destroy)
-    actor._lifetime_stack.callback(shmarr.destroy)
+
     return shmarr
 
 
 def attach_shm_array(
     token: Tuple[str, str, Tuple[str, str]],
-    size: int = int(60*60*10/5),
+    size: int = _default_size,
     readonly: bool = True,
 ) -> ShmArray:
-    """Load and attach to an existing shared memory array previously
+    """Attach to an existing shared memory array previously
     created by another process using ``open_shared_array``.
+
+    No new shared mem is allocated but wrapper types for read/write
+    access are constructed.
     """
     token = _Token.from_msg(token)
     key = token.shm_name
+
     if key in _known_tokens:
         assert _known_tokens[key] == token, "WTF"
 
-    shm = shared_memory.SharedMemory(name=key)
+    # attach to array buffer and view as per dtype
+    shm = SharedMemory(name=key)
     shmarr = np.ndarray(
         (size,),
         dtype=token.dtype_descr,
@@ -288,15 +379,29 @@ def attach_shm_array(
     )
     shmarr.setflags(write=int(not readonly))
 
-    counter = SharedInt(token=token.shm_counter_name)
+    first = SharedInt(
+        shm=SharedMemory(
+            name=token.shm_first_index_name,
+            create=False,
+            size=4,  # std int
+        ),
+    )
+    last = SharedInt(
+        shm=SharedMemory(
+            name=token.shm_last_index_name,
+            create=False,
+            size=4,  # std int
+        ),
+    )
+
     # make sure we can read
-    counter.value
+    first.value
 
     sha = ShmArray(
         shmarr,
-        counter,
+        first,
+        last,
         shm,
-        readonly=readonly,
     )
     # read test
     sha.array
@@ -308,8 +413,8 @@ def attach_shm_array(
         _known_tokens[key] = token
 
     # "close" attached shm on process teardown
-    actor = tractor.current_actor()
+    tractor._actor._lifetime_stack.callback(sha.close)
-    actor._lifetime_stack.callback(sha.close)
+
     return sha
 
 
@@ -318,21 +423,20 @@ def maybe_open_shm_array(
     dtype: Optional[np.dtype] = None,
     **kwargs,
 ) -> Tuple[ShmArray, bool]:
-    """Attempt to attach to a shared memory block by a
+    """Attempt to attach to a shared memory block using a "key" lookup
-    "key" determined by the users overall "system"
+    to registered blocks in the users overall "system" registryt
     (presumes you don't have the block's explicit token).
 
-    This function is meant to solve the problem of
+    This function is meant to solve the problem of discovering whether
-    discovering whether a shared array token has been
+    a shared array token has been allocated or discovered by the actor
-    allocated or discovered by the actor running in
+    running in **this** process. Systems where multiple actors may seek
-    **this** process. Systems where multiple actors
+    to access a common block can use this function to attempt to acquire
-    may seek to access a common block can use this
+    a token as discovered by the actors who have previously stored
-    function to attempt to acquire a token as discovered
+    a "key" -> ``_Token`` map in an actor local (aka python global)
-    by the actors who have previously stored a
+    variable.
-    "key" -> ``_Token`` map in an actor local variable.
 
-    If you know the explicit ``_Token`` for your memory
+    If you know the explicit ``_Token`` for your memory segment instead
-    instead use ``attach_shm_array``.
+    use ``attach_shm_array``.
     """
     try:
         # see if we already know this key

piker/data/_source.py

@@ -15,27 +15,36 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 """
-Numpy data source machinery.
+numpy data source coversion helpers.
 """
 import decimal
 from dataclasses import dataclass
 
 import numpy as np
 import pandas as pd
+# from numba import from_dtype
 
 
+ohlc_fields = [
+    ('time', float),
+    ('open', float),
+    ('high', float),
+    ('low', float),
+    ('close', float),
+    ('volume', int),
+    ('bar_wap', float),
+]
+
+ohlc_with_index = ohlc_fields.copy()
+ohlc_with_index.insert(0, ('index', int))
+
 # our minimum structured array layout for ohlc data
-base_ohlc_dtype = np.dtype(
+base_iohlc_dtype = np.dtype(ohlc_with_index)
-    [
+base_ohlc_dtype = np.dtype(ohlc_fields)
-        ('index', int),
+
-        ('time', float),
+# TODO: for now need to construct this manually for readonly arrays, see
-        ('open', float),
+# https://github.com/numba/numba/issues/4511
-        ('high', float),
+# numba_ohlc_dtype = from_dtype(base_ohlc_dtype)
-        ('low', float),
-        ('close', float),
-        ('volume', int),
-    ]
-)
 
 # map time frame "keys" to minutes values
 tf_in_1m = {
@@ -110,18 +119,27 @@ def from_df(
         'Low': 'low',
         'Close': 'close',
         'Volume': 'volume',
+
+        # most feeds are providing this over sesssion anchored
+        'vwap': 'bar_wap',
+
+        # XXX: ib_insync calls this the "wap of the bar"
+        # but no clue what is actually is...
+        # https://github.com/pikers/piker/issues/119#issuecomment-729120988
+        'average': 'bar_wap',
     }
 
     df = df.rename(columns=columns)
 
     for name in df.columns:
-        if name not in base_ohlc_dtype.names[1:]:
+        # if name not in base_ohlc_dtype.names[1:]:
+        if name not in base_ohlc_dtype.names:
             del df[name]
 
     # TODO: it turns out column access on recarrays is actually slower:
     # https://jakevdp.github.io/PythonDataScienceHandbook/02.09-structured-data-numpy.html#RecordArrays:-Structured-Arrays-with-a-Twist
     # it might make sense to make these structured arrays?
-    array = df.to_records()
+    array = df.to_records(index=False)
     _nan_to_closest_num(array)
 
     return array

piker/ui/_axes.py

@@ -38,7 +38,7 @@ class Axis(pg.AxisItem):
     def __init__(
         self,
         linked_charts,
-        typical_max_str: str = '100 000.00',
+        typical_max_str: str = '100 000.000',
         min_tick: int = 2,
         **kwargs
     ) -> None:
@@ -51,6 +51,8 @@ class Axis(pg.AxisItem):
         self.setStyle(**{
             'textFillLimits': [(0, 0.666)],
             'tickFont': _font.font,
+            # offset of text *away from* axis line in px
+            'tickTextOffset': 2,
         })
 
         self.setTickFont(_font.font)
@@ -88,11 +90,10 @@ class PriceAxis(Axis):
         # print(f'digits: {digits}')
 
         return [
-            ('{value:,.{digits}f}')
+            ('{value:,.{digits}f}').format(
-                .format(
+                digits=digits,
-                    digits=digits,
+                value=v,
-                    value=v,
+            ).replace(',', ' ') for v in vals
-                ).replace(',', ' ') for v in vals
         ]
 
 
@@ -104,23 +105,36 @@ class DynamicDateAxis(Axis):
         60: '%H:%M',
         30: '%H:%M:%S',
         5: '%H:%M:%S',
+        1: '%H:%M:%S',
     }
 
     def resize(self) -> None:
-        self.setHeight(self.typical_br.height() + 3)
+        self.setHeight(self.typical_br.height() + 1)
 
     def _indexes_to_timestrs(
         self,
         indexes: List[int],
     ) -> List[str]:
 
-        bars = self.linked_charts.chart._array
+        # 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()
 
@@ -228,6 +242,7 @@ class AxisLabel(pg.GraphicsObject):
 
 
 class XAxisLabel(AxisLabel):
+    _w_margin = 4
 
     text_flags = (
         QtCore.Qt.TextDontClip
@@ -255,18 +270,17 @@ class XAxisLabel(AxisLabel):
         w = self.boundingRect().width()
         self.setPos(QPointF(
             abs_pos.x() - w / 2 - offset,
-            0,
+            1,
         ))
         self.update()
 
 
 class YAxisLabel(AxisLabel):
-    _h_margin = 3
+    _h_margin = 2
-    # _w_margin = 1
 
     text_flags = (
-        # QtCore.Qt.AlignLeft
+        QtCore.Qt.AlignLeft
-        QtCore.Qt.AlignHCenter
+        # QtCore.Qt.AlignHCenter
         | QtCore.Qt.AlignVCenter
         | QtCore.Qt.TextDontClip
     )
@@ -283,13 +297,13 @@ class YAxisLabel(AxisLabel):
     ) -> None:
 
         # this is read inside ``.paint()``
-        self.label_str = '{value:,.{digits}f}'.format(
+        self.label_str = ' {value:,.{digits}f}'.format(
             digits=self.digits, value=value).replace(',', ' ')
 
         br = self.boundingRect()
         h = br.height()
         self.setPos(QPointF(
-            0,
+            1,
             abs_pos.y() - h / 2 - offset
         ))
         self.update()

piker/ui/_exec.py

@@ -20,12 +20,15 @@ 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
 
 # Qt specific
 import PyQt5  # noqa
+import pyqtgraph as pg
 from pyqtgraph import QtGui
 from PyQt5 import QtCore
 from PyQt5.QtCore import (
@@ -37,6 +40,12 @@ import tractor
 from outcome import Error
 
 
+# pyqtgraph global config
+# might as well enable this for now?
+pg.useOpenGL = True
+pg.enableExperimental = True
+
+
 # singleton app per actor
 _qt_app: QtGui.QApplication = None
 _qt_win: QtGui.QMainWindow = None
@@ -67,6 +76,17 @@ class MainWindow(QtGui.QMainWindow):
         self.setMinimumSize(*self.size)
         self.setWindowTitle(self.title)
 
+    def closeEvent(
+        self,
+        event: 'QCloseEvent'
+    ) -> None:
+        """Cancel the root actor asap.
+
+        """
+        # raising KBI seems to get intercepted by by Qt so just use the
+        # system.
+        os.kill(os.getpid(), signal.SIGINT)
+
 
 def run_qtractor(
     func: Callable,
@@ -115,11 +135,15 @@ def run_qtractor(
 
     def done_callback(outcome):
 
-        print(f"Outcome: {outcome}")
-
         if isinstance(outcome, Error):
             exc = outcome.error
-            traceback.print_exception(type(exc), exc, exc.__traceback__)
+
+            if isinstance(outcome.error, KeyboardInterrupt):
+                # make it kinda look like ``trio``
+                print("Terminated!")
+
+            else:
+                traceback.print_exception(type(exc), exc, exc.__traceback__)
 
         app.quit()
 
@@ -154,6 +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

@@ -17,39 +17,44 @@
 """
 Chart graphics for displaying a slew of different data types.
 """
-
+import inspect
-# import time
 from typing import List, Optional, Tuple
 
 import numpy as np
 import pyqtgraph as pg
-# from numba import jit, float64, optional, int64
+from numba import jit, float64, int64  # , optional
+# from numba import types as ntypes
 from PyQt5 import QtCore, QtGui
 from PyQt5.QtCore import QLineF, QPointF
 
-# from .._profile import timeit
+from .._profile import timeit
+# from ..data._source import numba_ohlc_dtype
 from ._style import (
     _xaxis_at,
     hcolor,
     _font,
+    _down_2_font_inches_we_like,
 )
 from ._axes import YAxisLabel, XAxisLabel, YSticky
 
 
 # XXX: these settings seem to result in really decent mouse scroll
 # latency (in terms of perceived lag in cross hair) so really be sure
-# there's an improvement if you want to change it.
+# there's an improvement if you want to change it!
-_mouse_rate_limit = 60  # calc current screen refresh rate?
+_mouse_rate_limit = 60  # TODO; should we calc current screen refresh rate?
 _debounce_delay = 1 / 2e3
 _ch_label_opac = 1
 
 
+# TODO: we need to handle the case where index is outside
+# the underlying datums range
 class LineDot(pg.CurvePoint):
 
     def __init__(
         self,
         curve: pg.PlotCurveItem,
         index: int,
+        plot: 'ChartPlotWidget',
         pos=None,
         size: int = 2,  # in pxs
         color: str = 'default_light',
@@ -61,6 +66,7 @@ class LineDot(pg.CurvePoint):
             pos=pos,
             rotate=False,
         )
+        self._plot = plot
 
         # TODO: get pen from curve if not defined?
         cdefault = hcolor(color)
@@ -80,6 +86,31 @@ class LineDot(pg.CurvePoint):
         # keep a static size
         self.setFlag(self.ItemIgnoresTransformations)
 
+    def event(
+        self,
+        ev: QtCore.QEvent,
+    ) -> None:
+        # print((ev, type(ev)))
+        if not isinstance(ev, QtCore.QDynamicPropertyChangeEvent) or self.curve() is None:
+            return False
+
+        # if ev.propertyName() == 'index':
+        #     print(ev)
+        #     # self.setProperty
+
+        (x, y) = self.curve().getData()
+        index = self.property('index')
+        # first = self._plot._ohlc[0]['index']
+        # first = x[0]
+        # i = index - first
+        i = index - x[0]
+        if i > 0 and i < len(y):
+            newPos = (index, y[i])
+            QtGui.QGraphicsItem.setPos(self, *newPos)
+            return True
+
+        return False
+
 
 _corner_anchors = {
     'top': 0,
@@ -91,8 +122,9 @@ _corner_anchors = {
 _corner_margins = {
     ('top', 'left'): (-4, -5),
     ('top', 'right'): (4, -5),
-    ('bottom', 'left'): (-4, 5),
+
-    ('bottom', 'right'): (4, 5),
+    ('bottom', 'left'): (-4, lambda font_size: font_size * 2),
+    ('bottom', 'right'): (4, lambda font_size: font_size * 2),
 }
 
 
@@ -109,7 +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)
@@ -120,6 +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(
@@ -129,15 +168,19 @@ class ContentsLabel(pg.LabelItem):
         array: np.ndarray,
     ) -> None:
         # this being "html" is the dumbest shit :eyeroll:
+        first = array[0]['index']
+
         self.setText(
             "<b>i</b>:{index}<br/>"
             "<b>O</b>:{}<br/>"
             "<b>H</b>:{}<br/>"
             "<b>L</b>:{}<br/>"
             "<b>C</b>:{}<br/>"
-            "<b>V</b>:{}".format(
+            "<b>V</b>:{}<br/>"
-                # *self._array[index].item()[2:8],
+            "<b>wap</b>:{}".format(
-                *array[index].item()[2:8],
+                *array[index - first][
+                    ['open', 'high', 'low', 'close', 'volume', 'bar_wap']
+                ],
                 name=name,
                 index=index,
             )
@@ -149,8 +192,10 @@ class ContentsLabel(pg.LabelItem):
         index: int,
         array: np.ndarray,
     ) -> None:
-        data = array[index][name]
+        first = array[0]['index']
-        self.setText(f"{name}: {data:.2f}")
+        if index < array[-1]['index'] and index > first:
+            data = array[index - first][name]
+            self.setText(f"{name}: {data:.2f}")
 
 
 class CrossHair(pg.GraphicsObject):
@@ -246,7 +291,7 @@ class CrossHair(pg.GraphicsObject):
     ) -> LineDot:
         # if this plot contains curves add line dot "cursors" to denote
         # the current sample under the mouse
-        cursor = LineDot(curve, index=len(plot._array))
+        cursor = LineDot(curve, index=plot._ohlc[-1]['index'], plot=plot)
         plot.addItem(cursor)
         self.graphics[plot].setdefault('cursors', []).append(cursor)
         return cursor
@@ -308,8 +353,9 @@ class CrossHair(pg.GraphicsObject):
                 plot.update_contents_labels(ix)
 
                 # update all subscribed curve dots
+                # first = plot._ohlc[0]['index']
                 for cursor in opts.get('cursors', ()):
-                    cursor.setIndex(ix)
+                    cursor.setIndex(ix) # - first)
 
             # update the label on the bottom of the crosshair
             self.xaxis_label.update_label(
@@ -332,96 +378,127 @@ class CrossHair(pg.GraphicsObject):
             return self.plots[0].boundingRect()
 
 
-# @jit(
+def _mk_lines_array(
-#     # float64[:](
+    data: List,
-#     #     float64[:],
+    size: int,
-#     #     optional(float64),
+    elements_step: int = 6,
-#     #     optional(int16)
+) -> np.ndarray:
-#     # ),
+    """Create an ndarray to hold lines graphics info.
-#     nopython=True,
+
-#     nogil=True
-# )
-def _mk_lines_array(data: List, size: int) -> np.ndarray:
-    """Create an ndarray to hold lines graphics objects.
     """
     return np.zeros_like(
         data,
-        shape=(int(size), 3),
+        shape=(int(size), elements_step),
         dtype=object,
     )
 
 
-# TODO: `numba` this?
+def lines_from_ohlc(row: np.ndarray, w: float) -> Tuple[QLineF]:
+    open, high, low, close, index = row[
+        ['open', 'high', 'low', 'close', 'index']]
 
-# @jit(
+    # high -> low vertical (body) line
-#     # float64[:](
+    if low != high:
-#     #     float64[:],
+        hl = QLineF(index, low, index, high)
-#     #     optional(float64),
+    else:
-#     #     optional(int16)
+        # XXX: if we don't do it renders a weird rectangle?
-#     # ),
+        # see below for filtering this later...
-#     nopython=True,
+        hl = None
-#     nogil=True
+
-# )
+    # NOTE: place the x-coord start as "middle" of the drawing range such
-def bars_from_ohlc(
+    # that the open arm line-graphic is at the left-most-side of
+    # the index's range according to the view mapping.
+
+    # open line
+    o = QLineF(index - w, open, index, open)
+    # close line
+    c = QLineF(index, close, index + w, close)
+
+    return [hl, o, c]
+
+
+@jit(
+    # TODO: for now need to construct this manually for readonly arrays, see
+    # https://github.com/numba/numba/issues/4511
+    # ntypes.Tuple((float64[:], float64[:], float64[:]))(
+    #     numba_ohlc_dtype[::1],  # contiguous
+    #     int64,
+    #     optional(float64),
+    # ),
+    nopython=True,
+    nogil=True
+)
+def path_arrays_from_ohlc(
     data: np.ndarray,
-    w: float,
+    start: int64,
-    start: int = 0,
+    bar_gap: float64 = 0.43,
 ) -> np.ndarray:
     """Generate an array of lines objects from input ohlc data.
 
     """
-    lines = _mk_lines_array(data, data.shape[0])
+    size = int(data.shape[0] * 6)
 
-    for i, q in enumerate(data[start:], start=start):
+    x = np.zeros(
-        open, high, low, close, index = q[
+        # data,
-            ['open', 'high', 'low', 'close', 'index']]
+        shape=size,
+        dtype=float64,
+    )
+    y, c = x.copy(), x.copy()
 
-        # high -> low vertical (body) line
+    # TODO: report bug for assert @
-        if low != high:
+    # /home/goodboy/repos/piker/env/lib/python3.8/site-packages/numba/core/typing/builtins.py:991
-            hl = QLineF(index, low, index, high)
+    for i, q in enumerate(data[start:], start):
-        else:
-            # XXX: if we don't do it renders a weird rectangle?
-            # see below for filtering this later...
-            hl = None
 
-        # NOTE: place the x-coord start as "middle" of the drawing range such
+        # TODO: ask numba why this doesn't work..
-        # that the open arm line-graphic is at the left-most-side of
+        # open, high, low, close, index = q[
-        # the index's range according to the view mapping.
+        #     ['open', 'high', 'low', 'close', 'index']]
 
-        # open line
+        open = q['open']
-        o = QLineF(index - w, open, index, open)
+        high = q['high']
-        # close line
+        low = q['low']
-        c = QLineF(index, close, index + w, close)
+        close = q['close']
+        index = float64(q['index'])
 
-        # indexing here is as per the below comments
+        istart = i * 6
-        lines[i] = (hl, o, c)
+        istop = istart + 6
 
-        # XXX: in theory we could get a further speedup by using a flat
+        # x,y detail the 6 points which connect all vertexes of a ohlc bar
-        # array and avoiding the call to `np.ravel()` below?
+        x[istart:istop] = (
-        # lines[3*i:3*i+3] = (hl, o, c)
+            index - bar_gap,
+            index,
+            index,
+            index,
+            index,
+            index + bar_gap,
+        )
+        y[istart:istop] = (
+            open,
+            open,
+            low,
+            high,
+            close,
+            close,
+        )
 
-        # XXX: legacy code from candles custom graphics:
+        # specifies that the first edge is never connected to the
-        # if not _tina_mode:
+        # prior bars last edge thus providing a small "gap"/"space"
-        # else _tina_mode:
+        # between bars determined by ``bar_gap``.
-        #     self.lines = lines = np.concatenate(
+        c[istart:istop] = (0, 1, 1, 1, 1, 1)
-        #       [high_to_low, open_sticks, close_sticks])
-        #     use traditional up/down green/red coloring
-        #     long_bars = np.resize(Quotes.close > Quotes.open, len(lines))
-        #     short_bars = np.resize(
-        #       Quotes.close < Quotes.open, len(lines))
 
-        #     ups = lines[long_bars]
+    return x, y, c
-        #     downs = lines[short_bars]
 
-        #     # draw "up" bars
-        #     p.setPen(self.bull_brush)
-        #     p.drawLines(*ups)
 
-        #     # draw "down" bars
+# @timeit
-        #     p.setPen(self.bear_brush)
+def gen_qpath(
-        #     p.drawLines(*downs)
+    data,
+    start,  # XXX: do we need this?
+    w,
+) -> QtGui.QPainterPath:
 
-    return lines
+    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)
 
 
 class BarItems(pg.GraphicsObject):
@@ -431,11 +508,10 @@ class BarItems(pg.GraphicsObject):
 
     # 0.5 is no overlap between arms, 1.0 is full overlap
     w: float = 0.43
-    bars_pen = pg.mkPen(hcolor('bracket'))
 
-    # XXX: tina mode, see below
+    # XXX: for the mega-lulz increasing width here increases draw latency...
-    # bull_brush = pg.mkPen('#00cc00')
+    # so probably don't do it until we figure that out.
-    # bear_brush = pg.mkPen('#fa0000')
+    bars_pen = pg.mkPen(hcolor('bracket'))
 
     def __init__(
         self,
@@ -443,95 +519,87 @@ class BarItems(pg.GraphicsObject):
         plotitem: 'pg.PlotItem',  # noqa
     ) -> None:
         super().__init__()
-        self.last = QtGui.QPicture()
+
-        self.history = QtGui.QPicture()
+        self.last_bar = QtGui.QPicture()
-        # TODO: implement updateable pixmap solution
+
+        self.path = QtGui.QPainterPath()
+        # self._h_path = QtGui.QGraphicsPathItem(self.path)
+
         self._pi = plotitem
-        # self._scene = plotitem.vb.scene()
+
-        # self.picture = QtGui.QPixmap(1000, 300)
+        self._xrange: Tuple[int, int]
-        # plotitem.addItem(self.picture)
+        self._yrange: Tuple[float, float]
-        # self._pmi = None
-        # self._pmi = self._scene.addPixmap(self.picture)
 
         # XXX: not sure this actually needs to be an array other
         # then for the old tina mode calcs for up/down bars below?
         # lines container
-        self.lines = _mk_lines_array([], 50e3)
+        # self.lines = _mk_lines_array([], 50e3, 6)
+
+        # TODO: don't render the full backing array each time
+        # self._path_data = None
+        self._last_bar_lines: Optional[Tuple[QLineF, ...]] = None
 
         # track the current length of drawable lines within the larger array
-        self.index: int = 0
+        self.start_index: int = 0
+        self.stop_index: int = 0
 
     # @timeit
     def draw_from_data(
         self,
         data: np.ndarray,
         start: int = 0,
-    ):
+    ) -> QtGui.QPainterPath:
         """Draw OHLC datum graphics from a ``np.ndarray``.
 
         This routine is usually only called to draw the initial history.
         """
-        lines = bars_from_ohlc(data, self.w, start=start)
+        self.path = gen_qpath(data, start, self.w)
 
         # save graphics for later reference and keep track
         # of current internal "last index"
-        index = len(lines)
+        # self.start_index = len(data)
-        self.lines[:index] = lines
+        index = data['index']
-        self.index = index
+        self._xrange = (index[0], index[-1])
+        self._yrange = (
+            np.nanmax(data['high']),
+            np.nanmin(data['low']),
+        )
 
         # up to last to avoid double draw of last bar
-        self.draw_lines(just_history=True, iend=self.index - 1)
+        self._last_bar_lines = lines_from_ohlc(data[-1], self.w)
-        self.draw_lines(iend=self.index)
 
-    # @timeit
+        # create pics
-    def draw_lines(
+        # self.draw_history()
-        self,
+        self.draw_last_bar()
-        istart=0,
-        iend=None,
-        just_history=False,
-        # TODO: could get even fancier and only update the single close line?
-        lines=None,
-    ) -> None:
-        """Draw the current line set using the painter.
-        """
-        if just_history:
-            # draw bars for the "history" picture
-            iend = iend or self.index - 1
-            pic = self.history
-        else:
-            # draw the last bar
-            istart = self.index - 1
-            iend = iend or self.index
-            pic = self.last
 
-        # use 2d array of lines objects, see conlusion on speed:
+        # trigger render
-        # https://stackoverflow.com/a/60089929
-        flat = np.ravel(self.lines[istart:iend])
-
-        # TODO: do this with numba for speed gain:
-        # https://stackoverflow.com/questions/58422690/filtering-a-numpy-array-what-is-the-best-approach
-        to_draw = flat[np.where(flat != None)]  # noqa
-
-        # pre-computing a QPicture object allows paint() to run much
-        # more quickly, rather than re-drawing the shapes every time.
-        p = QtGui.QPainter(pic)
-        p.setPen(self.bars_pen)
-
-        # TODO: is there any way to not have to pass all the lines every
-        # iteration? It seems they won't draw unless it's done this way..
-        p.drawLines(*to_draw)
-        p.end()
-
-        # XXX: if we ever try using `QPixmap` again...
-        # if self._pmi is None:
-        #     self._pmi = self.scene().addPixmap(self.picture)
-        # else:
-        #     self._pmi.setPixmap(self.picture)
-
-        # trigger re-render
         # https://doc.qt.io/qt-5/qgraphicsitem.html#update
         self.update()
 
+        return self.path
+
+    # def update_ranges(
+    #     self,
+    #     xmn: int,
+    #     xmx: int,
+    #     ymn: float,
+    #     ymx: float,
+    # ) -> None:
+    #     ...
+
+
+    def draw_last_bar(self) -> None:
+        """Currently this draws lines to a cached ``QPicture`` which
+        is supposed to speed things up on ``.paint()`` calls (which
+        is a call to ``QPainter.drawPicture()`` but I'm not so sure.
+
+        """
+        p = QtGui.QPainter(self.last_bar)
+        p.setPen(self.bars_pen)
+        p.drawLines(*tuple(filter(bool, self._last_bar_lines)))
+        p.end()
+
+    # @timeit
     def update_from_array(
         self,
         array: np.ndarray,
@@ -545,32 +613,65 @@ class BarItems(pg.GraphicsObject):
         graphics object, and then update/rerender, but here we're
         assuming the prior graphics havent changed (OHLC history rarely
         does) so this "should" be simpler and faster.
+
+        This routine should be made (transitively) as fast as possible.
         """
-        index = self.index
+        # index = self.start_index
-        length = len(array)
+        istart, istop = self._xrange
-        extra = length - index
 
-        # start_bar_to_update = index - 100
+        index = array['index']
+        first_index, last_index = index[0], index[-1]
+
+        # length = len(array)
+        prepend_length = istart - first_index
+        append_length = last_index - istop
+
+        # TODO: allow mapping only a range of lines thus
+        # only drawing as many bars as exactly specified.
+
+        if prepend_length:
+
+            # 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 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.addPath(old_path)
+
+        if append_length:
+            # generate new lines objects for updatable "current bar"
+            self._last_bar_lines = lines_from_ohlc(array[-1], self.w)
+            self.draw_last_bar()
 
-        if extra > 0:
             # generate new graphics to match provided array
-            new = array[index:index + extra]
+            # path appending logic:
-            lines = bars_from_ohlc(new, self.w)
+            # we need to get the previous "current bar(s)" for the time step
-            bars_added = len(lines)
+            # and convert it to a sub-path to append to the historical set
-            self.lines[index:index + bars_added] = lines
+            # new_bars = array[istop - 1:istop + append_length - 1]
-            self.index += bars_added
+            new_bars = array[-append_length - 1:-1]
+            append_path = gen_qpath(new_bars, 0, self.w)
+            self.path.moveTo(float(istop - self.w), float(new_bars[0]['open']))
+            self.path.addPath(append_path)
 
-            # start_bar_to_update = index - bars_added
+        self._xrange = first_index, last_index
-            self.draw_lines(just_history=True)
-            if just_history:
-                return
 
-        # current bar update
+        if just_history:
+            self.update()
+            return
+
+        # last bar update
         i, o, h, l, last, v = array[-1][
             ['index', 'open', 'high', 'low', 'close', 'volume']
         ]
-        assert i == self.index - 1
+        # assert i == self.start_index - 1
-        body, larm, rarm = self.lines[i]
+        assert i == last_index
+        body, larm, rarm = self._last_bar_lines
 
         # XXX: is there a faster way to modify this?
         rarm.setLine(rarm.x1(), last, rarm.x2(), last)
@@ -579,16 +680,26 @@ class BarItems(pg.GraphicsObject):
 
         if l != h:  # noqa
             if body is None:
-                body = self.lines[index - 1][0] = QLineF(i, l, i, h)
+                body = self._last_bar_lines[0] = QLineF(i, l, i, h)
             else:
                 # update body
                 body.setLine(i, l, i, h)
-        else:
-            # XXX: h == l -> remove any HL line to avoid render bug
-            if body is not None:
-                body = self.lines[index - 1][0] = None
 
-        self.draw_lines(just_history=False)
+        # XXX: pretty sure this is causing an issue where the bar has
+        # a large upward move right before the next sample and the body
+        # is getting set to None since the next bar is flat but the shm
+        # array index update wasn't read by the time this code runs. Iow
+        # we're doing this removal of the body for a bar index that is
+        # now out of date / from some previous sample. It's weird
+        # though because i've seen it do this to bars i - 3 back?
+
+        # else:
+        #     # XXX: h == l -> remove any HL line to avoid render bug
+        #     if body is not None:
+        #         body = self.lines[index - 1][0] = None
+
+        self.draw_last_bar()
+        self.update()
 
     # @timeit
     def paint(self, p, opt, widget):
@@ -606,33 +717,36 @@ 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.drawPicture(0, 0, self.last)
 
-        # TODO: if we can ever make pixmaps work...
+        p.setPen(self.bars_pen)
-        # p.drawPixmap(0, 0, self.picture)
+        p.drawPath(self.path)
-        # self._pmi.setPixmap(self.picture)
-        # print(self.scene())
-
-        # profiler('bars redraw:')
 
+    # @timeit
     def boundingRect(self):
-        # TODO: can we do rect caching to make this faster?
-
         # Qt docs: https://doc.qt.io/qt-5/qgraphicsitem.html#boundingRect
+
+        # TODO: Can we do rect caching to make this faster
+        # like `pg.PlotCurveItem` does? In theory it's just
+        # computing max/min stuff again like we do in the udpate loop
+        # anyway. Not really sure it's necessary since profiling already
+        # shows this method is faf.
+
         # boundingRect _must_ indicate the entire area that will be
         # drawn on or else we will get artifacts and possibly crashing.
         # (in this case, QPicture does all the work of computing the
         # bounding rect for us).
 
         # compute aggregate bounding rectangle
-        lb = self.last.boundingRect()
+        lb = self.last_bar.boundingRect()
-        hb = self.history.boundingRect()
+        hb = self.path.boundingRect()
+
         return QtCore.QRectF(
             # top left
             QtCore.QPointF(hb.topLeft()),
             # total size
-            QtCore.QSizeF(lb.size() + hb.size())
+            QtCore.QSizeF(QtCore.QSizeF(lb.size()) + hb.size())
+            # QtCore.QSizeF(lb.size() + hb.size())
         )
 
 
@@ -785,7 +899,7 @@ class L1Labels:
         chart: 'ChartPlotWidget',  # noqa
         digits: int = 2,
         size_digits: int = 0,
-        font_size_inches: float = 4 / 53.,
+        font_size_inches: float = _down_2_font_inches_we_like,
     ) -> None:
 
         self.chart = chart
@@ -839,7 +953,9 @@ def level_line(
     digits: int = 1,
 
     # size 4 font on 4k screen scaled down, so small-ish.
-    font_size_inches: float = 4 / 53.,
+    font_size_inches: float = _down_2_font_inches_we_like,
+
+    show_label: bool = True,
 
     **linelabelkwargs
 ) -> LevelLine:
@@ -859,6 +975,7 @@ def level_line(
         **linelabelkwargs
     )
     label.update_from_data(0, level)
+
     # TODO: can we somehow figure out a max value from the parent axis?
     label._size_br_from_str(label.label_str)
 
@@ -874,4 +991,7 @@ def level_line(
 
     chart.plotItem.addItem(line)
 
+    if not show_label:
+        label.hide()
+
     return line

piker/ui/_interaction.py

@@ -245,7 +245,7 @@ class ChartView(ViewBox):
             log.debug("Max zoom bruh...")
             return
 
-        if ev.delta() < 0 and vl >= len(self.linked_charts._array) + 666:
+        if ev.delta() < 0 and vl >= len(self.linked_charts.chart._ohlc) + 666:
             log.debug("Min zoom bruh...")
             return
 
@@ -268,9 +268,9 @@ class ChartView(ViewBox):
         #     ).map(furthest_right_coord)
         # )
 
-        # This seems like the most "intuitive option, a hybrdid of
+        # This seems like the most "intuitive option, a hybrid of
         # tws and tv styles
-        last_bar = pg.Point(rbar)
+        last_bar = pg.Point(int(rbar))
 
         self._resetTarget()
         self.scaleBy(s, last_bar)

piker/ui/_style.py

@@ -18,6 +18,7 @@
 Qt UI styling.
 """
 from typing import Optional
+import math
 
 import pyqtgraph as pg
 from PyQt5 import QtCore, QtGui
@@ -27,10 +28,9 @@ from ..log import get_logger
 
 log = get_logger(__name__)
 
-# chart-wide font
+# chart-wide fonts specified in inches
-# font size 6px / 53 dpi (3x scaled down on 4k hidpi)
+_default_font_inches_we_like = 6 / 96
-_default_font_inches_we_like = 6 / 53  # px / (px / inch) = inch
+_down_2_font_inches_we_like = 5 / 96
-_down_2_font_inches_we_like = 4 / 53
 
 
 class DpiAwareFont:
@@ -66,8 +66,12 @@ class DpiAwareFont:
         listed in the script in ``snippets/qt_screen_info.py``.
 
         """
-        dpi = screen.physicalDotsPerInch()
+        # take the max since scaling can make things ugly in some cases
-        font_size = round(self._iwl * dpi)
+        pdpi = screen.physicalDotsPerInch()
+        ldpi = screen.logicalDotsPerInch()
+        dpi = max(pdpi, ldpi)
+
+        font_size = math.floor(self._iwl * dpi)
         log.info(
             f"\nscreen:{screen.name()} with DPI: {dpi}"
             f"\nbest font size is {font_size}\n"