/
bootstrap_with_replication.py
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bootstrap_with_replication.py
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import time
from concurrent.futures import _base
from concurrent.futures.thread import ThreadPoolExecutor
from threading import Thread
from time import sleep
from typing import Iterable
from flask import Flask, Response, current_app, request
from requests import get as http_get
from node import ResponseLevel, inverse_response_level
PORT_APP = dict()
def create_application(app_name: str, dependencies=None):
dependencies = [] if dependencies is None else dependencies
app_name = app_name.replace(',', '_')
app = Flask(app_name)
app.__response_level = ResponseLevel.NORMAL
app.__dependencies = dependencies
app.__executor = ThreadPoolExecutor(max_workers=16)
# check dependencies should run asynchronously
def check_dependencies(visited: str, dependencies: Iterable[str], executor: _base.Executor) -> bool:
visited_set = set(visited.split(','))
filtered_dep = filter(lambda x: PORT_APP[int(x.split(':')[1])] not in visited_set, dependencies)
# futures = []
# for target in filtered_dep:
# get_url = f'http://{target}/?from={visited}'
# future = executor.submit(lambda: http_get(get_url))
# futures.append((get_url, future))
#
# for (get_url, future) in futures:
# result = future.result()
# is_ok = result.status_code == 200
# if not is_ok:
# return False
for target in filtered_dep:
get_url = f'http://{target}/?from={visited}'
response = http_get(get_url)
is_ok = response.status_code == 200
if not is_ok:
return False
return True
@app.route('/', methods=['GET'])
@app.route('/ping', methods=['GET'])
def ping():
visited = request.args.get('from')
updated_visited = current_app.name + ('' if visited is None else (',' + visited))
response_level = current_app.__response_level
if response_level == ResponseLevel.NORMAL:
dependencies_ok = check_dependencies(updated_visited, current_app.__dependencies, current_app.__executor)
message, code = ('OK', 200) if dependencies_ok else ('UNHEALTHY', 500)
return Response(message, code)
elif response_level == ResponseLevel.TERMINATED:
return Response('UNHEALTHY', 500)
else:
sleep(5.0)
dependencies_ok = check_dependencies(updated_visited, current_app.__dependencies, current_app.__executor)
message, code = ('OK', 200) if dependencies_ok else ('UNHEALTHY', 500)
return Response(message, code)
@app.route('/response/<level>', methods=['GET'])
def set_response_level(level):
try:
level = int(level)
response_level = inverse_response_level(level)
current_app.__response_level = response_level
return 'OK'
except ValueError as e:
return str(e)
return app
def create_load_balancer(app_name: str, dependencies=None):
dependencies = [] if dependencies is None else dependencies
app_name = app_name.replace(',', '_')
app = Flask(app_name)
app.__response_level = ResponseLevel.NORMAL
app.__dependencies = dependencies
app.__executor = ThreadPoolExecutor(max_workers=16)
# check dependencies should run asynchronously
def check_dependencies(visited: str, dependencies: Iterable[str], executor: _base.Executor) -> bool:
visited_set = set(visited.split(','))
filtered_dep = filter(lambda x: PORT_APP[int(x.split(':')[1])] not in visited_set, dependencies)
# futures = []
# for target in filtered_dep:
# get_url = f'http://{target}/?from={visited}'
# future = executor.submit(lambda: http_get(get_url))
# futures.append((get_url, future))
#
# for (get_url, future) in futures:
# result = future.result()
# is_ok = result.status_code == 200
# if not is_ok:
# return False
for target in filtered_dep:
get_url = f'http://{target}/?from={visited}'
response = http_get(get_url)
is_ok = response.status_code == 200
if is_ok:
return True
return False
@app.route('/', methods=['GET'])
@app.route('/ping', methods=['GET'])
def ping():
visited = request.args.get('from')
updated_visited = current_app.name + ('' if visited is None else (',' + visited))
response_level = current_app.__response_level
if response_level == ResponseLevel.NORMAL:
dependencies_ok = check_dependencies(updated_visited, current_app.__dependencies, current_app.__executor)
message, code = ('OK', 200) if dependencies_ok else ('UNHEALTHY', 500)
return Response(message, code)
elif response_level == ResponseLevel.TERMINATED:
return Response('UNHEALTHY', 500)
else:
sleep(5.0)
dependencies_ok = check_dependencies(updated_visited, current_app.__dependencies, current_app.__executor)
message, code = ('OK', 200) if dependencies_ok else ('UNHEALTHY', 500)
return Response(message, code)
@app.route('/response/<level>', methods=['GET'])
def set_response_level(level):
try:
level = int(level)
response_level = inverse_response_level(level)
current_app.__response_level = response_level
return 'OK'
except ValueError as e:
return str(e)
return app
class SimpleNodeStartable(object):
def __init__(self, name, dependencies=None, load_balancer=False):
dependencies = [] if dependencies is None else dependencies
if load_balancer:
self.app = create_load_balancer(name, dependencies)
else:
self.app = create_application(name, dependencies)
def start(self, host='127.0.0.1', port=5000):
# With Multi-Threading Apps, YOU CANNOT USE DEBUG! Though you can sub-thread.
th = Thread(target=lambda: self.app.run(host, port, debug=False, threaded=True))
th.start()
def bootstrap(graph=None):
if graph is None:
graph = {}
host = '127.0.0.1'
name_and_address = []
dependencies = dict()
for node, node_dependencies in graph.items():
node_name = "app" + str(node)
port = 5000 + int(node)
address = host + ':' + str(port)
name_and_address.append((node_name, address))
dependencies[node_name] = []
for dep in node_dependencies:
if node == dep:
continue
dependencies[node_name].append(host + ':' + str(5000 + int(dep)))
if len(dependencies[node_name]) == 0:
SimpleNodeStartable(node_name).start(port=port)
else:
SimpleNodeStartable(node_name, dependencies[node_name]).start(port=port)
PORT_APP[port] = node_name
time.sleep(1)
print(f'''
!!!!!!!!!!!!!!!!!!!!!!!!!!
!! BOOTSTRAP SUCCESSFUL !!
!!!!!!!!!!!!!!!!!!!!!!!!!!
''')
for (node_name, address) in name_and_address:
name = node_name
port = address.split(":")[1]
port = int(port)
print(f'[INFO] {name} is running on {host} (PORT: {port})')
def bootstrap2(graph=None, replication=1):
if graph is None:
graph = {}
host = '127.0.0.1'
name_and_address = []
dependencies = dict()
# assign port for each node
port_counter = 1
LB_PORT = dict()
for node, node_dependencies in graph.items():
LB_PORT[node] = 5000 + port_counter
port_counter += 1
for node, node_dependencies in graph.items():
replica_ports = []
for rep in range(replication):
node_name = "app" + str(node) + f'_{rep}'
port = 5000 + port_counter
port_counter += 1
replica_ports.append(port)
address = host + ':' + str(port)
name_and_address.append((node_name, address))
dependencies[node_name] = []
for dep in node_dependencies:
if node == dep:
continue
lb_port = LB_PORT[dep]
dependencies[node_name].append(host + ':' + str(lb_port))
if len(dependencies[node_name]) == 0:
SimpleNodeStartable(node_name).start(port=port)
else:
SimpleNodeStartable(node_name, dependencies[node_name]).start(port=port)
PORT_APP[port] = node_name
transformed_loc = [f'{host}:{x}' for x in replica_ports]
node_name = "LB" + str(node)
port = LB_PORT[node]
address = host + ':' + str(port)
name_and_address.append((node_name, address))
SimpleNodeStartable(node_name, transformed_loc, True).start(port=port)
PORT_APP[port] = node_name
time.sleep(1)
print(f'''
!!!!!!!!!!!!!!!!!!!!!!!!!!
!! BOOTSTRAP SUCCESSFUL !!
!!!!!!!!!!!!!!!!!!!!!!!!!!
''')
for (node_name, address) in name_and_address:
name = node_name
port = address.split(":")[1]
port = int(port)
print(f'[INFO] {name} is running on {host} (PORT: {port})')
if __name__ == '__main__':
# graph = {
# 1: {2, 3},
# 2: {4},
# 3: {},
# 4: {}
# }
graph = {
1: {2},
2: {}
}
bootstrap2(graph, 1)