1 | # Module handling the connection to FSUIPC
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2 |
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3 | import threading
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4 | import os
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5 | import fs
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6 | import time
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7 |
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8 | if os.name == "nt":
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9 | import pyuipc
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10 | else:
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11 | import pyuipc_emu as pyuipc
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12 |
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13 | class Handler(threading.Thread):
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14 | """The thread to handle the FSUIPC requests."""
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15 | class Request(object):
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16 | """A simple, one-shot request."""
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17 | def __init__(self, forWrite, data, callback, extra):
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18 | """Construct the request."""
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19 | self._forWrite = forWrite
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20 | self._data = data
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21 | self._callback = callback
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22 | self._extra = extra
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23 |
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24 | def process(self, time):
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25 | """Process the request."""
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26 | if self._forWrite:
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27 | pyuipc.write(self._data)
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28 | self._callback(self._extra)
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29 | else:
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30 | values = pyuipc.read(self._data)
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31 | self._callback(values, self._extra)
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32 |
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33 | return True
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34 |
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35 | class PeriodicRequest(object):
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36 | """A periodic request."""
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37 | def __init__(self, id, period, data, callback, extra):
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38 | """Construct the periodic request."""
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39 | self._id = id
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40 | self._period = period
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41 | self._nextFire = time.time() + period
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42 | self._data = data
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43 | self._preparedData = None
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44 | self._callback = callback
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45 | self._extra = extra
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46 |
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47 | @property
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48 | def id(self):
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49 | """Get the ID of this periodic request."""
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50 | return self._id
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51 |
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52 | @property
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53 | def nextFire(self):
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54 | """Get the next firing time."""
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55 | return self._nextFire
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56 |
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57 | def process(self, time):
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58 | """Check if this request should be executed, and if so, do so.
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59 |
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60 | Return a boolean indicating if the request was executed."""
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61 | if time < self._nextFire:
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62 | return False
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63 |
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64 | if self._preparedData is None:
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65 | self._preparedData = pyuipc.prepare_data(self._data)
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66 | self._data = None
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67 |
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68 | values = pyuipc.read(self._preparedData)
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69 |
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70 | self._callback(values, self._extra)
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71 |
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72 | while self._nextFire <= time:
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73 | self._nextFire += self._period
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74 |
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75 | return True
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76 |
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77 | def __cmp__(self, other):
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78 | """Compare two periodic requests. They are ordered by their next
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79 | firing times."""
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80 | return cmp(self._nextFire, other._nextFire)
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81 |
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82 | def __init__(self, connectionListener):
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83 | """Construct the handler with the given connection listener."""
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84 | threading.Thread.__init__(self)
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85 |
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86 | self._connectionListener = connectionListener
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87 |
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88 | self._requestCondition = threading.Condition()
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89 | self._connectionRequested = False
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90 |
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91 | self._requests = []
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92 | self._nextPeriodicID = 1
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93 | self._periodicRequests = []
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94 |
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95 | self.daemon = True
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96 |
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97 | def requestRead(self, data, callback, extra = None):
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98 | """Request the reading of some data.
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99 |
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100 | data is a list of tuples of the following items:
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101 | - the offset of the data as an integer
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102 | - the type letter of the data as a string
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103 |
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104 | callback is a function that receives two pieces of data:
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105 | - the values retrieved
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106 | - the extra parameter
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107 |
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108 | It will be called in the handler's thread!
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109 | """
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110 | with self._requestCondition:
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111 | self._requests.append(Handler.Request(False, data, callback, extra))
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112 | self._requestCondition.notify()
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113 |
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114 | def requestWrite(self, data, callback, extra = None):
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115 | """Request the writing of some data.
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116 |
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117 | data is a list of tuples of the following items:
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118 | - the offset of the data as an integer
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119 | - the type letter of the data as a string
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120 | - the data to write
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121 |
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122 | callback is a function that receives the extra data when writing was
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123 | succesful. It will called in the handler's thread!
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124 | """
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125 | with self._requestCondition:
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126 | self._requests.append(Handler.Request(True, data, callback, extra))
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127 | self._requestCondition.notify()
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128 |
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129 | def requestPeriodicRead(self, period, data, callback, extra = None):
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130 | """Request a periodic read of data.
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131 |
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132 | period is a floating point number with the period in seconds.
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133 |
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134 | This function returns an identifier which can be used to cancel the
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135 | request."""
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136 | with self._requestCondition:
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137 | id = self._nextPeriodicID
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138 | self._nextPeriodicID += 1
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139 | request = Handler.PeriodicRequest(id, period, data, callback, extra)
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140 | self._periodicRequests.append(request)
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141 | self._requestCondition.notify()
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142 | return id
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143 |
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144 | def clearPeriodic(self, id):
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145 | """Clear the periodic request with the given ID."""
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146 | with self._requestCondition:
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147 | for i in range(0, len(self._periodicRequests)):
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148 | if self._periodicRequests[i].id==id:
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149 | del self._periodicRequests[i]
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150 | return True
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151 | return False
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152 |
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153 | def connect(self):
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154 | """Initiate the connection to the flight simulator."""
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155 | with self._requestCondition:
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156 | if not self._connectionRequested:
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157 | self._connectionRequested = True
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158 | self._requestCondition.notify()
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159 |
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160 | def disconnect(self):
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161 | """Disconnect from the flight simulator."""
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162 | with self._requestCondition:
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163 | if self._connectionRequested:
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164 | self._connectionRequested = False
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165 | self._requestCondition.notify()
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166 |
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167 | def run(self):
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168 | """Perform the operation of the thread."""
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169 | while True:
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170 | self._waitConnectionRequest()
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171 |
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172 | if self._connect():
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173 | self._handleConnection()
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174 |
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175 | self._disconnect()
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176 |
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177 | def _waitConnectionRequest(self):
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178 | """Wait for a connection request to arrive."""
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179 | with self._requestCondition:
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180 | while not self._connectionRequested:
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181 | self._requestCondition.wait()
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182 |
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183 | def _connect(self):
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184 | """Try to connect to the flight simulator via FSUIPC"""
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185 | while self._connectionRequested:
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186 | try:
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187 | pyuipc.open(pyuipc.SIM_FS2K4)
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188 | description = "(FSUIPC version: 0x%04x, library version: 0x%04x, FS version: %d)" % \
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189 | (pyuipc.fsuipc_version, pyuipc.lib_version,
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190 | pyuipc.fs_version)
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191 | self._connectionListener.connected(fs.TYPE_FS2K4, description)
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192 | return True
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193 | except Exception, e:
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194 | print "fsuipc.Handler._connect: connection failed: " + str(e)
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195 |
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196 | return False
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197 |
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198 | def _handleConnection(self):
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199 | """Handle a living connection."""
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200 | with self._requestCondition:
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201 | while self._connectionRequested:
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202 | if not self._processRequests():
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203 | return
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204 | timeout = None
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205 | if self._periodicRequests:
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206 | self._periodicRequests.sort()
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207 | timeout = self._periodicRequests[0].nextFire - time.time()
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208 | if timeout is None or timeout > 0.0:
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209 | self._requestCondition.wait(timeout)
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210 |
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211 | def _disconnect(self):
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212 | """Disconnect from the flight simulator."""
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213 | pyuipc.close()
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214 | self._connectionListener.disconnected()
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215 |
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216 | def _processRequest(self, request, time):
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217 | """Process the given request.
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218 |
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219 | If an exception occurs, we try to reconnect.
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220 |
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221 | Returns what the request's process() function returned or None if
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222 | reconnection failed."""
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223 |
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224 | self._requestCondition.release()
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225 |
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226 | try:
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227 | return request.process(time)
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228 | except Exception as e:
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229 | print "fsuipc.Handler._processRequest: FSUIPC connection failed (" + \
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230 | str(e) + ") reconnecting."
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231 | self._disconnect()
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232 | if not self._connect(): return None
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233 | else: return True
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234 | finally:
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235 | self._requestCondition.acquire()
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236 |
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237 | def _processRequests(self):
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238 | """Process any pending requests.
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239 |
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240 | Will be called with the request lock held."""
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241 | while self._connectionRequested and self._periodicRequests:
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242 | self._periodicRequests.sort()
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243 | request = self._periodicRequests[0]
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244 | result = self._processRequest(request, time.time())
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245 | if result is None: return False
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246 | elif not result: break
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247 |
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248 | while self._connectionRequested and self._requests:
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249 | request = self._requests[0]
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250 | del self._requests[0]
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251 |
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252 | if self._processRequest(request, None) is None:
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253 | return False
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254 |
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255 | return self._connectionRequested
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