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curses_renderer.py
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curses_renderer.py
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import curses
from list_generator import generate_list
from typing import Union, Dict, List, Optional
from wherefore.DataSource import DataSource
from datetime import datetime, timezone
from wherefore.KafkaMessageTracker import HighLowOffset
DEBUG = False
DEFAULT_LIST_ROWS = 9
DEFAULT_LIST_WIDTH = 80
def time_to_str(timestamp: Optional[datetime]):
if timestamp is None:
return "n/a"
return timestamp.strftime("%Y-%m-%d %H:%M:%S.%f %Z")
def get_time_diff(time1, time2):
if time1 is None or time2 is None:
return "n/a"
return f"{(time1 - time2).total_seconds():8.2f}"
def draw_full_line(window, row, text, invert=False):
height, width = window.getmaxyx()
print_width = len(text)
if print_width == width:
pass
elif print_width > width:
print_width = width
text = text[0 : print_width - 3] + "..."
draw_function = window.insstr
if len(text) < width:
draw_function = window.addstr
if invert:
draw_function(row, 0, text[0:print_width], curses.A_REVERSE)
else:
draw_function(row, 0, text[0:print_width])
class CursesRenderer:
def __init__(self, topic_name, partition):
self.topic_name = topic_name
self.partition = partition
self.screen = curses.initscr()
curses.noecho()
curses.cbreak()
curses.curs_set(0)
self.screen.keypad(1)
self.screen.timeout(0)
self.selected_item = 0
self.current_offsets = HighLowOffset(-1, -1)
self.known_sources: List[DataSource] = []
def __del__(self):
if not DEBUG:
curses.nocbreak()
curses.curs_set(1)
self.screen.keypad(0)
curses.echo()
curses.endwin()
def set_data(self, data: Union[Dict, List]):
if type(data) is dict:
self.known_sources = list(data.values())
elif type(data) is list:
self.known_sources = data
else:
raise RuntimeError("Can not set data of type: " + str(type(data)))
def set_partition_offsets(self, current_offsets: HighLowOffset):
self.current_offsets = current_offsets
def draw_sources_list(self):
height, width = self.screen.getmaxyx()
used_width = DEFAULT_LIST_WIDTH
prototype_line = "{:^6.6s}| {:40.40s}| {:30.30s}"
draw_full_line(
self.screen, 2, prototype_line.format("Id", "Name", "Last timestamp")
)
self.screen.addstr(3, 0, "-" * used_width)
if width < used_width:
used_width = width
used_height = DEFAULT_LIST_ROWS
if used_height + 3 > height:
used_height = height - 3
sources_win = curses.newwin(used_height, used_width, 4, 0)
win_height, win_width = sources_win.getmaxyx()
available_rows = win_height
sources_to_list, selection_row = generate_list(
self.known_sources, available_rows, self.selected_item
)
for i, item in enumerate(sources_to_list):
selected = False
if i == selection_row:
selected = True
if type(item) is str:
draw_full_line(sources_win, i, " " + item * 3)
else:
draw_full_line(
sources_win,
i,
prototype_line.format(
item.source_type,
item.source_name,
time_to_str(item.last_timestamp),
),
selected,
)
sources_win.refresh()
def draw_selected_source_info(self):
height, width = self.screen.getmaxyx()
if self.selected_item < 0:
return
current_source = self.known_sources[self.selected_item]
current_message = current_source.last_message
now = datetime.now(tz=timezone.utc)
info_rows = []
timestamp_format = "{:20.20s} | {:30.30s} | {:10.10s}"
first_ts_string = time_to_str(current_source.first_timestamp)
info_rows.append(
f"First offset: {current_source.first_offset:>12d} First timestamp: {first_ts_string}"
)
info_rows.append(
f"Current offset: {current_message.offset:>10d} Consumption rate: {current_source.processed_per_second:8.3f}/s"
)
info_rows.append(
f"Current msg. size: {current_message.size:>7d} Message rate: {current_source.messages_per_second:12.3f}/s"
)
info_rows.append(
f"Received messages: {current_source.processed_messages:7d} Data rate: {current_source.bytes_per_second:11.0f} bytes/s"
)
info_rows.append(f"Data: {current_message.data}")
info_rows.append(timestamp_format.format("Type", "Timestamp", "Age (s)"))
info_rows.append("-" * 80)
info_rows.append(
timestamp_format.format(
"Message time",
time_to_str(current_message.timestamp),
get_time_diff(now, current_message.timestamp),
)
)
info_rows.append(
timestamp_format.format(
"Kafka time",
time_to_str(current_message.kafka_timestamp),
get_time_diff(now, current_message.kafka_timestamp),
)
)
info_rows.append(
timestamp_format.format(
"Receive time",
time_to_str(current_message.local_timestamp),
get_time_diff(now, current_message.local_timestamp),
)
)
if height > DEFAULT_LIST_ROWS + 3:
self.screen.addstr(13, 0, "-" * DEFAULT_LIST_WIDTH)
remaining_height = height - 14
if remaining_height <= 0:
return
source_info_win = curses.newwin(remaining_height, width, 14, 0)
for i in range(remaining_height):
if i == len(info_rows):
break
draw_full_line(source_info_win, i, info_rows[i])
source_info_win.refresh()
def handle_key_press(self):
key_pressed = self.screen.getch()
if key_pressed == curses.KEY_DOWN:
self.selected_item += 1
elif key_pressed == curses.KEY_UP:
self.selected_item -= 1
if self.selected_item < 0:
self.selected_item = 0
if self.selected_item >= len(self.known_sources):
self.selected_item = len(self.known_sources) - 1
def draw(self):
self.handle_key_press()
height, width = self.screen.getmaxyx()
header_line = f"Topic: {self.topic_name}, Partition#: {self.partition}"
header_line2 = f"Low offset: {self.current_offsets.low:10d} High offset: {self.current_offsets.high:10d} Lag: {self.current_offsets.lag:10d}"
draw_full_line(self.screen, 0, header_line)
draw_full_line(self.screen, 1, header_line2)
self.draw_sources_list()
self.draw_selected_source_info()
self.screen.refresh()