Mercurial > libervia-web

annotate libervia/web/pages/_browser/bridge.py @ 1518:eb00d593801d

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refactoring: rename `libervia` to `libervia.web` + update imports following backend changes
author Goffi <goffi@goffi.org>
date Fri, 02 Jun 2023 16:49:28 +0200
parents libervia/pages/_browser/bridge.py@5ea06e8b06ed
children be20e6ac9f22
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1510
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1 from browser import window, aio, 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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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 BridgeException(Exception):
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15 """An exception which has been raised from the backend and arrived to the frontend."""
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16
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17 def __init__(self, name, message="", condition=""):
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18 """
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19
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20 @param name (str): full exception class name (with module)
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21 @param message (str): error message
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22 @param condition (str) : error condition
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23 """
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24 Exception.__init__(self)
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25 self.fullname = str(name)
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26 self.message = str(message)
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27 self.condition = str(condition) if condition else ""
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28 self.module, __, self.classname = str(self.fullname).rpartition(".")
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29
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30 def __str__(self):
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31 return f"{self.classname}: {self.message or ''}"
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32
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33 def __eq__(self, other):
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34 return self.classname == other
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35
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36
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37 class WebSocket:
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38
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39 def __init__(self, broadcast_channel):
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40 self.broadcast_channel = broadcast_channel
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41 self.token = window.ws_token
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42 self.create_socket()
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43 self.retrying = False
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44 self.network_error = False
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45
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46 @property
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47 def profile(self):
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48 return self.broadcast_channel.profile
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49
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50 def retry_connect(self) -> None:
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51 if self.retrying:
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52 return
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53 self.retrying = True
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54 try:
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55 notif = dialog.RetryNotification(self.create_socket)
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56 notif.show(
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57 "Can't connect to server",
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58 delay=random.randint(0, 30)
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59 )
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60 except Exception as e:
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61 # for security reasons, browser don't give the reason of the error with
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62 # WebSockets, thus we try to detect network error here, as if we can't show
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63 # the retry dialog, that probably means that it's not reachable
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64 try:
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65 name = e.name
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66 except AttributeError:
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67 name = None
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68 if name == "NetworkError":
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69 self.network_error = True
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70 log.warning("network error detected, server may be down")
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71 log.error(f"Can't show retry dialog: {e}")
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72 log.info("retrying in 30s")
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73 timer.set_timeout(self.create_socket, 30000)
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74 else:
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75 raise e
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76 else:
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77 # if we can show the retry dialog, the network is fine
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78 self.network_error = False
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79
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80 def create_socket(self) -> None:
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81 log.debug("creating socket")
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82 self.retrying = False
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83 self.socket = window.WebSocket.new(window.ws_url, "libervia-page")
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84 self.socket_start = time.time()
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85 self.socket.bind("open", self.on_open)
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86 self.socket.bind("error", self.on_error)
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87 self.socket.bind("close", self.on_close)
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88 self.socket.bind("message", self.on_message)
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89
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90 def send(self, data_type: str, data: dict) -> None:
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91 self.socket.send(json.dumps({
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92 "type": data_type,
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93 "data": data
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94 }))
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95
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96 def close(self) -> None:
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97 log.debug("closing socket")
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98 self.broadcast_channel.ws = None
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99 self.socket.close()
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100
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101 def on_open(self, evt) -> None:
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102 log.info("websocket connection opened")
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103 self.send("init", {"profile": self.profile, "token": self.token})
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104
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105 def on_error(self, evt) -> None:
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106 if not self.network_error and time.time() - self.socket_start < 5:
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107 # disconnection is happening fast, we try to reload
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108 log.warning("Reloading due to suspected session error")
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109 window.location.reload()
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110 else:
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111 self.retry_connect()
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112
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113 def on_close(self, evt) -> None:
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114 log.warning(f"websocket is closed {evt.code=} {evt.reason=}")
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115 if self.broadcast_channel.ws is None:
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116 # this is a close requested locally
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117 return
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118 elif evt.code == 4401:
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119 log.info(
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120 "no authorized, the session is probably not valid anymore, reloading"
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121 )
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122 window.location.reload()
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123 else:
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124 # close event may be due to normal tab closing, thus we try to reconnect only
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125 # after a delay
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126 timer.set_timeout(self.retry_connect, 5000)
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127
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128 def on_message(self, message_evt):
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129 msg_data = json.loads(message_evt.data)
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130 msg_type = msg_data.get("type")
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131 if msg_type == "bridge":
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132 log.debug(
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133 f"==> bridge message: {msg_data=}"
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134 )
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135 self.broadcast_channel.post(
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136 msg_type,
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137 msg_data["data"]
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138 )
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139 elif msg_type == "force_close":
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140 log.warning(f"force closing connection: {msg_data.get('reason')}")
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141 self.close()
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142 else:
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143 dialog.notification.show(
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144 f"Unexpected message type {msg_type}"
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145 "error"
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146 )
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147
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148
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149 class BroadcastChannel:
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150 handlers = {}
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151
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152 def __init__(self):
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153 log.debug(f"BroadcastChannel init with profile {self.profile!r}")
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154 self.start = time.time()
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155 self.bc = window.BroadcastChannel.new("libervia")
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156 self.bc.bind("message", self.on_message)
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157 # there is no way to check if there is already a connection in BroadcastChannel
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158 # API, thus we wait a bit to see if somebody is answering. If not, we are probably
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159 # the first tab.
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160 self.check_connection_timer = timer.set_timeout(self.establish_connection, 20)
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161 self.ws = None
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162 # set of all known tab ids
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163 self.tabs_ids = {tab_id}
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164 self.post("salut_a_vous", {
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165 "id": tab_id,
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166 "profile": self.profile
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167 })
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168 window.bind("unload", self.on_unload)
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169
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170 @property
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171 def profile(self):
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172 return window.profile or ""
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173
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174 @property
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175 def connecting_tab(self) -> bool:
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176 """True is this tab is the one establishing the websocket connection"""
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177 return self.ws is not None
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178
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179 @connecting_tab.setter
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180 def connecting_tab(self, connecting: bool) -> None:
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181 if connecting:
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182 if self.ws is None:
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183 self.ws = WebSocket(self)
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184 self.post("connection", {
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185 "tab_id": tab_id
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186 })
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187 elif self.ws is not None:
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188 self.ws.close()
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189
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190 def establish_connection(self) -> None:
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191 """Called when there is no existing connection"""
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192 timer.clear_timeout(self.check_connection_timer)
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193 log.debug(f"Establishing connection {tab_id=}")
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194 self.connecting_tab = True
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195
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196 def handle_bridge_signal(self, data: dict) -> None:
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197 """Forward bridge signals to registered handlers"""
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198 signal = data["signal"]
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199 handlers = self.handlers.get(signal, [])
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200 for handler in handlers:
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201 handler(*data["args"])
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202
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203 def on_message(self, evt) -> None:
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204 data = json.loads(evt.data)
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205 if data["type"] == "bridge":
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206 self.handle_bridge_signal(data)
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diff changeset
207 elif data["type"] == "salut_a_toi":
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208 # this is a response from existing tabs
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209 other_tab_id = data["id"]
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210 if other_tab_id == tab_id:
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211 # in the unlikely case that this happens, we simply reload this tab to get
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212 # a new ID
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213 log.warning("duplicate tab id, we reload the page: {tab_id=}")
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214 window.location.reload()
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215 return
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216 self.tabs_ids.add(other_tab_id)
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217 if data["connecting_tab"] and self.check_connection_timer is not None:
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218 # this tab has the websocket connection to server
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219 log.info(f"there is already a connection to server at tab {other_tab_id}")
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220 timer.clear_timeout(self.check_connection_timer)
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221 self.check_connection_timer = None
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222 elif data["type"] == "salut_a_vous":
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223 # a new tab has just been created
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diff changeset
224 if data["profile"] != self.profile:
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diff changeset
225 log.info(
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
226 f"we are now connected with the profile {data['profile']}, "
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
227 "reloading the page"
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
228 )
409d10211b20 server, browser: dynamic pages refactoring:
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229 window.location.reload()
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diff changeset
230 else:
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diff changeset
231 self.tabs_ids.add(data["id"])
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diff changeset
232 self.post("salut_a_toi", {
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diff changeset
233 "id": tab_id,
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234 "connecting_tab": self.connecting_tab
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diff changeset
235 })
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
236 elif data["type"] == "connection":
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diff changeset
237 log.info(f"tab {data['id']} is the new connecting tab")
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diff changeset
238 elif data["type"] == "salut_a_rantanplan":
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
239 # a tab is being closed
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
240 other_tab_id = data["id"]
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diff changeset
241 # it is unlikely that there is a collision, but just in case we check it
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diff changeset
242 if other_tab_id != tab_id:
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diff changeset
243 self.tabs_ids.discard(other_tab_id)
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diff changeset
244 if data["connecting_tab"]:
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diff changeset
245 log.info(f"connecting tab with id {other_tab_id} has been closed")
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parents: 1477
diff changeset
246 if max(self.tabs_ids) == tab_id:
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diff changeset
247 log.info("this is the new connecting tab, establish_connection")
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diff changeset
248 self.connecting_tab = True
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
249 else:
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
250 log.info(f"tab with id {other_tab_id} has been closed")
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diff changeset
251 else:
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
252 log.warning(f"unknown message type: {data}")
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
253
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
254 def post(self, data_type, data: dict):
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diff changeset
255 data["type"] = data_type
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diff changeset
256 data["id"] = tab_id
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diff changeset
257 self.bc.postMessage(json.dumps(data))
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diff changeset
258 if data_type == "bridge":
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
259 self.handle_bridge_signal(data)
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diff changeset
260
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
261 def on_unload(self, evt) -> None:
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
262 """Send a message to indicate that the tab is being closed"""
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diff changeset
263 self.post("salut_a_rantanplan", {
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diff changeset
264 "id": tab_id,
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diff changeset
265 "connecting_tab": self.connecting_tab
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
266 })
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
267
409d10211b20 server, browser: dynamic pages refactoring:
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diff changeset
268
1510
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Goffi <goffi@goffi.org>
parents: 1509
diff changeset
269 class Bridge:
1504
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diff changeset
270 bc: BroadcastChannel | None = None
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271
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diff changeset
272 def __init__(self) -> None:
1510
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273 if Bridge.bc is None:
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parents: 1509
diff changeset
274 Bridge.bc = BroadcastChannel()
1297
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parents:
diff changeset
275
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parents:
diff changeset
276 def __getattr__(self, attr):
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parents:
diff changeset
277 return lambda *args, **kwargs: self.call(attr, *args, **kwargs)
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parents:
diff changeset
278
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parents:
diff changeset
279 def on_load(self, xhr, ev, callback, errback):
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Goffi <goffi@goffi.org>
parents:
diff changeset
280 if xhr.status == 200:
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parents:
diff changeset
281 ret = javascript.JSON.parse(xhr.response)
1314
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diff changeset
282 if callback is not None:
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283 if ret is None:
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284 callback()
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285 else:
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286 callback(ret)
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287 elif xhr.status == 502:
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288 # PROXY_ERROR is used for bridge error
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289 ret = javascript.JSON.parse(xhr.response)
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290 if errback is not None:
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291 errback(ret)
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292 else:
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293 log.error(
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294 f"bridge call failed: code: {xhr.response}, text: {xhr.statusText}"
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295 )
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296 if errback is not None:
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297 errback({"fullname": "BridgeInternalError", "message": xhr.statusText})
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298
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299 def call(self, method_name, *args, callback, errback, **kwargs):
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300 xhr = window.XMLHttpRequest.new()
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301 xhr.bind('load', lambda ev: self.on_load(xhr, ev, callback, errback))
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302 xhr.bind('error', lambda ev: errback(
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303 {"fullname": "ConnectionError", "message": xhr.statusText}))
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304 xhr.open("POST", f"/_bridge/{method_name}", True)
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305 data = javascript.JSON.stringify({
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306 "args": args,
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307 "kwargs": kwargs,
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308 })
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309 xhr.setRequestHeader('X-Csrf-Token', window.csrf_token)
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310 xhr.send(data)
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311
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312 def register_signal(self, signal: str, handler, iface=None) -> None:
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313 BroadcastChannel.handlers.setdefault(signal, []).append(handler)
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314 log.debug(f"signal {signal} has been registered")
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315
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316
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317 class AsyncBridge:
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318
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319 def __getattr__(self, attr):
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320 return lambda *args, **kwargs: self.call(attr, *args, **kwargs)
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321
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322 async def call(self, method_name, *args, **kwargs):
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323 print(f"calling {method_name}")
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324 data = javascript.JSON.stringify({
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325 "args": args,
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326 "kwargs": kwargs,
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327 })
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328 url = f"/_bridge/{method_name}"
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329 r = await aio.post(
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330 url,
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331 headers={
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332 'X-Csrf-Token': window.csrf_token,
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333 },
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334 data=data,
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335 )
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336
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337 if r.status == 200:
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338 return javascript.JSON.parse(r.data)
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339 elif r.status == 502:
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340 ret = javascript.JSON.parse(r.data)
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341 raise BridgeException(ret['fullname'], ret['message'], ret['condition'])
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342 else:
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343 print(f"bridge called failed: code: {r.status}, text: {r.statusText}")
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344 raise BridgeException("InternalError", r.statusText)
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345
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346 def register_signal(self, signal: str, handler, iface=None) -> None:
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347 BroadcastChannel.handlers.setdefault(signal, []).append(handler)
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348 log.debug(f"signal {signal} has been registered")