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annotate libervia/pages/_browser/bridge.py @ 1506:ce879da7fcf7

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server: fix `on_signal` callback
author Goffi <goffi@goffi.org>
date Thu, 23 Mar 2023 17:50:54 +0100
parents 409d10211b20
children 106bae41f5c8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1504
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1 from browser import window, timer, console as log
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2 import time
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3 import random
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4 import json
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5 import dialog
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999dccf0093e browser: new bridge module to access restricted bridge from browser
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6 import javascript
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7
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8
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9 log.warning = log.warn
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10 tab_id = random.randint(0, 2**64)
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11 log.info(f"TAB ID is {tab_id}")
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12
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13
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14 class WebSocket:
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15
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16 def __init__(self, broadcast_channel):
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17 self.broadcast_channel = broadcast_channel
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18 self.token = window.ws_token
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19 self.create_socket()
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20 self.retrying = False
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21 self.network_error = False
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22
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23 @property
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24 def profile(self):
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25 return self.broadcast_channel.profile
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26
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27 def retry_connect(self) -> None:
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28 if self.retrying:
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29 return
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30 self.retrying = True
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31 try:
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32 notif = dialog.RetryNotification(self.create_socket)
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33 notif.show(
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34 "Can't connect to server",
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35 delay=random.randint(0, 30)
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36 )
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37 except Exception as e:
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38 # for security reasons, browser don't give the reason of the error with
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39 # WebSockets, thus we try to detect network error here, as if we can't show
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40 # the retry dialog, that probably means that it's not reachable
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41 try:
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42 name = e.name
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43 except AttributeError:
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44 name = None
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45 if name == "NetworkError":
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46 self.network_error = True
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47 log.warning("network error detected, server may be down")
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48 log.error(f"Can't show retry dialog: {e}")
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49 log.info("retrying in 30s")
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50 timer.set_timeout(self.create_socket, 30000)
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51 else:
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52 raise e
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53 else:
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54 # if we can show the retry dialog, the network is fine
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55 self.network_error = False
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56
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57 def create_socket(self) -> None:
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58 log.debug("creating socket")
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59 self.retrying = False
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60 self.socket = window.WebSocket.new(window.ws_url, "libervia-page")
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61 self.socket_start = time.time()
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62 self.socket.bind("open", self.on_open)
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63 self.socket.bind("error", self.on_error)
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64 self.socket.bind("close", self.on_close)
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65 self.socket.bind("message", self.on_message)
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66
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67 def send(self, data_type: str, data: dict) -> None:
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68 self.socket.send(json.dumps({
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69 "type": data_type,
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70 "data": data
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71 }))
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72
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73 def close(self) -> None:
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74 log.debug("closing socket")
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75 self.broadcast_channel.ws = None
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76 self.socket.close()
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77
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78 def on_open(self, evt) -> None:
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79 log.info("websocket connection opened")
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80 self.send("init", {"profile": self.profile, "token": self.token})
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81
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82 def on_error(self, evt) -> None:
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83 if not self.network_error and time.time() - self.socket_start < 5:
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84 # disconnection is happening fast, we try to reload
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85 log.warning("Reloading due to suspected session error")
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86 window.location.reload()
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87 else:
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88 self.retry_connect()
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89
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90 def on_close(self, evt) -> None:
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91 log.warning(f"websocket is closed {evt.code=} {evt.reason=}")
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92 if self.broadcast_channel.ws is None:
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93 # this is a close requested locally
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94 return
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95 elif evt.code == 4401:
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96 log.info(
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97 "no authorized, the session is probably not valid anymore, reloading"
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98 )
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99 window.location.reload()
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100 else:
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101 # close event may be due to normal tab closing, thus we try to reconnect only
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102 # after a delay
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103 timer.set_timeout(self.retry_connect, 5000)
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104
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105 def on_message(self, message_evt):
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106 msg_data = json.loads(message_evt.data)
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107 msg_type = msg_data.get("type")
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108 if msg_type == "bridge":
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109 log.debug(
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110 f"==> bridge message: {msg_data=}"
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111 )
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112 self.broadcast_channel.post(
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113 msg_type,
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114 msg_data["data"]
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115 )
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116 elif msg_type == "force_close":
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117 log.warning(f"force closing connection: {msg_data.get('reason')}")
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118 self.close()
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119 else:
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120 dialog.notification.show(
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121 f"Unexpected message type {msg_type}"
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122 "error"
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123 )
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124
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125
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126 class BroadcastChannel:
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127 handlers = {}
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128
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129 def __init__(self):
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130 log.debug(f"BroadcastChannel init with profile {self.profile!r}")
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131 self.start = time.time()
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132 self.bc = window.BroadcastChannel.new("libervia")
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133 self.bc.bind("message", self.on_message)
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134 # there is no way to check if there is already a connection in BroadcastChannel
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135 # API, thus we wait a bit to see if somebody is answering. If not, we are probably
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136 # the first tab.
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137 self.check_connection_timer = timer.set_timeout(self.establish_connection, 20)
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138 self.ws = None
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139 # set of all known tab ids
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140 self.tabs_ids = {tab_id}
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141 self.post("salut_a_vous", {
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142 "id": tab_id,
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143 "profile": self.profile
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144 })
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145 window.bind("unload", self.on_unload)
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146
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147 @property
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148 def profile(self):
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149 return window.profile or ""
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150
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151 @property
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152 def connecting_tab(self) -> bool:
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153 """True is this tab is the one establishing the websocket connection"""
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154 return self.ws is not None
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155
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156 @connecting_tab.setter
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157 def connecting_tab(self, connecting: bool) -> None:
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158 if connecting:
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159 if self.ws is None:
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160 self.ws = WebSocket(self)
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161 self.post("connection", {
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162 "tab_id": tab_id
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163 })
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164 elif self.ws is not None:
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165 self.ws.close()
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166
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167 def establish_connection(self) -> None:
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168 """Called when there is no existing connection"""
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169 timer.clear_timeout(self.check_connection_timer)
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170 log.debug(f"Establishing connection {tab_id=}")
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171 self.connecting_tab = True
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172
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173 def handle_bridge_signal(self, data: dict) -> None:
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174 """Forward bridge signals to registered handlers"""
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175 signal = data["signal"]
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176 handlers = self.handlers.get(signal, [])
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177 for handler in handlers:
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178 handler(*data["args"])
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179
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180 def on_message(self, evt) -> None:
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181 data = json.loads(evt.data)
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182 if data["type"] == "bridge":
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183 self.handle_bridge_signal(data)
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184 elif data["type"] == "salut_a_toi":
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185 # this is a response from existing tabs
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186 other_tab_id = data["id"]
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187 if other_tab_id == tab_id:
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188 # in the unlikely case that this happens, we simply reload this tab to get
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189 # a new ID
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190 log.warning("duplicate tab id, we reload the page: {tab_id=}")
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191 window.location.reload()
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192 return
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193 self.tabs_ids.add(other_tab_id)
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194 if data["connecting_tab"] and self.check_connection_timer is not None:
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195 # this tab has the websocket connection to server
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196 log.info(f"there is already a connection to server at tab {other_tab_id}")
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197 timer.clear_timeout(self.check_connection_timer)
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198 self.check_connection_timer = None
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199 elif data["type"] == "salut_a_vous":
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200 # a new tab has just been created
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201 if data["profile"] != self.profile:
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diff changeset
202 log.info(
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
203 f"we are now connected with the profile {data['profile']}, "
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
204 "reloading the page"
409d10211b20 server, browser: dynamic pages refactoring:
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205 )
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
206 window.location.reload()
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diff changeset
207 else:
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diff changeset
208 self.tabs_ids.add(data["id"])
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diff changeset
209 self.post("salut_a_toi", {
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diff changeset
210 "id": tab_id,
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211 "connecting_tab": self.connecting_tab
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diff changeset
212 })
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
213 elif data["type"] == "connection":
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diff changeset
214 log.info(f"tab {data['id']} is the new connecting tab")
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diff changeset
215 elif data["type"] == "salut_a_rantanplan":
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diff changeset
216 # a tab is being closed
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diff changeset
217 other_tab_id = data["id"]
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diff changeset
218 # it is unlikely that there is a collision, but just in case we check it
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diff changeset
219 if other_tab_id != tab_id:
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diff changeset
220 self.tabs_ids.discard(other_tab_id)
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diff changeset
221 if data["connecting_tab"]:
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diff changeset
222 log.info(f"connecting tab with id {other_tab_id} has been closed")
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parents: 1477
diff changeset
223 if max(self.tabs_ids) == tab_id:
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Goffi <goffi@goffi.org>
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diff changeset
224 log.info("this is the new connecting tab, establish_connection")
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diff changeset
225 self.connecting_tab = True
409d10211b20 server, browser: dynamic pages refactoring:
Goffi <goffi@goffi.org>
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diff changeset
226 else:
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
227 log.info(f"tab with id {other_tab_id} has been closed")
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Goffi <goffi@goffi.org>
parents: 1477
diff changeset
228 else:
409d10211b20 server, browser: dynamic pages refactoring:
Goffi <goffi@goffi.org>
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diff changeset
229 log.warning(f"unknown message type: {data}")
409d10211b20 server, browser: dynamic pages refactoring:
Goffi <goffi@goffi.org>
parents: 1477
diff changeset
230
409d10211b20 server, browser: dynamic pages refactoring:
Goffi <goffi@goffi.org>
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diff changeset
231 def post(self, data_type, data: dict):
409d10211b20 server, browser: dynamic pages refactoring:
Goffi <goffi@goffi.org>
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diff changeset
232 data["type"] = data_type
409d10211b20 server, browser: dynamic pages refactoring:
Goffi <goffi@goffi.org>
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diff changeset
233 data["id"] = tab_id
409d10211b20 server, browser: dynamic pages refactoring:
Goffi <goffi@goffi.org>
parents: 1477
diff changeset
234 self.bc.postMessage(json.dumps(data))
409d10211b20 server, browser: dynamic pages refactoring:
Goffi <goffi@goffi.org>
parents: 1477
diff changeset
235 if data_type == "bridge":
409d10211b20 server, browser: dynamic pages refactoring:
Goffi <goffi@goffi.org>
parents: 1477
diff changeset
236 self.handle_bridge_signal(data)
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
237
409d10211b20 server, browser: dynamic pages refactoring:
Goffi <goffi@goffi.org>
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diff changeset
238 def on_unload(self, evt) -> None:
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
239 """Send a message to indicate that the tab is being closed"""
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Goffi <goffi@goffi.org>
parents: 1477
diff changeset
240 self.post("salut_a_rantanplan", {
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
241 "id": tab_id,
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
242 "connecting_tab": self.connecting_tab
409d10211b20 server, browser: dynamic pages refactoring:
Goffi <goffi@goffi.org>
parents: 1477
diff changeset
243 })
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
244
409d10211b20 server, browser: dynamic pages refactoring:
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245
1297
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Goffi <goffi@goffi.org>
parents:
diff changeset
246 class Bridge:
1504
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
247 bc: BroadcastChannel | None = None
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diff changeset
248
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diff changeset
249 def __init__(self) -> None:
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diff changeset
250 if Bridge.bc is None:
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diff changeset
251 Bridge.bc = BroadcastChannel()
1297
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parents:
diff changeset
252
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parents:
diff changeset
253 def __getattr__(self, attr):
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parents:
diff changeset
254 return lambda *args, **kwargs: self.call(attr, *args, **kwargs)
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parents:
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255
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parents:
diff changeset
256 def on_load(self, xhr, ev, callback, errback):
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Goffi <goffi@goffi.org>
parents:
diff changeset
257 if xhr.status == 200:
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Goffi <goffi@goffi.org>
parents:
diff changeset
258 ret = javascript.JSON.parse(xhr.response)
1314
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diff changeset
259 if callback is not None:
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diff changeset
260 if ret is None:
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Goffi <goffi@goffi.org>
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diff changeset
261 callback()
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Goffi <goffi@goffi.org>
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diff changeset
262 else:
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Goffi <goffi@goffi.org>
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diff changeset
263 callback(ret)
1297
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Goffi <goffi@goffi.org>
parents:
diff changeset
264 elif xhr.status == 502:
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Goffi <goffi@goffi.org>
parents:
diff changeset
265 # PROXY_ERROR is used for bridge error
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Goffi <goffi@goffi.org>
parents:
diff changeset
266 ret = javascript.JSON.parse(xhr.response)
1314
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diff changeset
267 if errback is not None:
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diff changeset
268 errback(ret)
1297
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parents:
diff changeset
269 else:
1504
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diff changeset
270 log.error(
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
271 f"bridge called failed: code: {xhr.response}, text: {xhr.statusText}"
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diff changeset
272 )
1314
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diff changeset
273 if errback is not None:
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Goffi <goffi@goffi.org>
parents: 1314
diff changeset
274 errback({"fullname": "BridgeInternalError", "message": xhr.statusText})
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parents:
diff changeset
275
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Goffi <goffi@goffi.org>
parents:
diff changeset
276 def call(self, method_name, *args, callback, errback, **kwargs):
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Goffi <goffi@goffi.org>
parents:
diff changeset
277 xhr = window.XMLHttpRequest.new()
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Goffi <goffi@goffi.org>
parents:
diff changeset
278 xhr.bind('load', lambda ev: self.on_load(xhr, ev, callback, errback))
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Goffi <goffi@goffi.org>
parents:
diff changeset
279 xhr.bind('error', lambda ev: errback(
999dccf0093e browser: new bridge module to access restricted bridge from browser
Goffi <goffi@goffi.org>
parents:
diff changeset
280 {"fullname": "ConnectionError", "message": xhr.statusText}))
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parents:
diff changeset
281 xhr.open("POST", f"/_bridge/{method_name}", True)
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Goffi <goffi@goffi.org>
parents:
diff changeset
282 data = javascript.JSON.stringify({
999dccf0093e browser: new bridge module to access restricted bridge from browser
Goffi <goffi@goffi.org>
parents:
diff changeset
283 "args": args,
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Goffi <goffi@goffi.org>
parents:
diff changeset
284 "kwargs": kwargs,
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Goffi <goffi@goffi.org>
parents:
diff changeset
285 })
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286 xhr.setRequestHeader('X-Csrf-Token', window.csrf_token)
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287 xhr.send(data)
1504
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288
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289 def register_signal(self, signal: str, handler, iface=None) -> None:
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290 BroadcastChannel.handlers.setdefault(signal, []).append(handler)
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parents: 1477
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291 log.debug(f"signal {signal} has been registered")