1 | from . import errors |
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2 | from .player import Player |
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3 | from gutenbach.ipp import JobStates as States |
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4 | import logging |
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5 | import os |
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6 | |
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7 | # initialize logger |
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8 | logger = logging.getLogger(__name__) |
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9 | |
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10 | class GutenbachJob(object): |
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11 | |
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12 | def __init__(self, job_id=None, creator=None, name=None, |
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13 | priority=None, document=None): |
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14 | """Create an empty Gutenbach job. |
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15 | |
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16 | Parameters |
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17 | ---------- |
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18 | job_id : integer |
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19 | A unique id for this job. |
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20 | creator : string |
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21 | The user creating the job. |
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22 | name : string |
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23 | The human-readable name of the job. |
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24 | priority : integer |
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25 | The priority of the job, used for ordering. |
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26 | document : file object |
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27 | A file object containing the job data. |
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28 | |
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29 | """ |
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30 | |
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31 | self.player = None |
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32 | self.document = None |
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33 | |
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34 | self.id = job_id |
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35 | self.creator = creator |
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36 | self.name = name |
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37 | self.priority = priority |
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38 | |
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39 | self._why_done = None |
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40 | |
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41 | if document is not None: |
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42 | self.spool(document) |
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43 | |
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44 | def __repr__(self): |
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45 | return str(self) |
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46 | |
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47 | def __str__(self): |
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48 | return "<Job %d '%s'>" % (self.id, self.name) |
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49 | |
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50 | def __cmp__(self, other): |
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51 | """Compares two GutenbachJobs based on their priorities. |
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52 | |
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53 | """ |
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54 | return cmp(self.priority, other.priority) |
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55 | |
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56 | def __del__(self): |
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57 | if self.player: |
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58 | if self.player.is_playing: |
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59 | self.player.mplayer_stop() |
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60 | if self.player.fh: |
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61 | if self.player.fh.closed: |
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62 | self.player.fh.close() |
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63 | self.player = None |
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64 | |
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65 | self.document = None |
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66 | self.id = None |
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67 | self.creator = None |
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68 | self.name = None |
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69 | self.priority = None |
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70 | self._why_done = None |
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71 | |
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72 | ###################################################################### |
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73 | ### Properties ### |
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74 | ###################################################################### |
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75 | |
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76 | @property |
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77 | def id(self): |
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78 | """Unique job identifier (integer). Should be a positive |
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79 | integer, except when unassigned, when it defaults to -1. |
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80 | |
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81 | """ |
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82 | return self._id |
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83 | @id.setter |
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84 | def id(self, val): |
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85 | try: |
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86 | self._id = max(int(val), -1) |
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87 | except: |
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88 | self._id = -1 |
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89 | |
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90 | @property |
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91 | def priority(self): |
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92 | """Job priority (integer). Should be a nonzero positive |
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93 | integer; defaults to 1 when unassigned. |
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94 | |
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95 | """ |
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96 | return self._priority |
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97 | @priority.setter |
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98 | def priority(self, val): |
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99 | try: |
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100 | self._priority = max(int(val), 1) |
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101 | except: |
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102 | self._priority = 1 |
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103 | |
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104 | @property |
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105 | def creator(self): |
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106 | """The user who created the job (string). Defaults to an |
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107 | empty string. |
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108 | |
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109 | """ |
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110 | return self._creator |
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111 | @creator.setter |
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112 | def creator(self, val): |
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113 | if val is None: |
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114 | self._creator = "" |
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115 | else: |
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116 | self._creator = str(val) |
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117 | |
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118 | @property |
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119 | def name(self): |
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120 | """The job's human-readable name (string). Defaults to an |
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121 | empty string. |
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122 | |
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123 | """ |
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124 | return self._name |
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125 | @name.setter |
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126 | def name(self, val): |
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127 | if val is None: |
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128 | self._name = "" |
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129 | else: |
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130 | self._name = str(val) |
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131 | |
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132 | @property |
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133 | def size(self): |
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134 | """The size of the job in octets/bytes (integer). Defaults to |
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135 | 0 if no document is specified or if there is an error reading |
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136 | the document. |
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137 | |
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138 | """ |
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139 | try: |
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140 | size = os.path.getsize(self.document) |
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141 | except: |
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142 | size = 0 |
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143 | return size |
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144 | |
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145 | ###################################################################### |
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146 | ### State ### |
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147 | ###################################################################### |
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148 | |
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149 | @property |
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150 | def is_valid(self): |
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151 | """Whether the job is ready to be manipulated (spooled, |
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152 | played, etc). Note that playing the job still requires it to |
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153 | be spooled first. |
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154 | |
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155 | """ |
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156 | |
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157 | return self.id > 0 and \ |
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158 | self.priority > 0 |
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159 | |
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160 | @property |
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161 | def is_ready(self): |
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162 | """Whether the job is ready to be played; i.e., it has all the |
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163 | necessary data to actually play the audio data. |
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164 | |
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165 | """ |
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166 | |
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167 | return self.is_valid and \ |
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168 | self.player is not None and \ |
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169 | not self.player.is_playing and \ |
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170 | not self._why_done == "cancelled" and \ |
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171 | not self._why_done == "aborted" |
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172 | |
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173 | @property |
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174 | def is_playing(self): |
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175 | """Whether the job is currently playing (regardless of whether |
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176 | it's paused). |
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177 | |
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178 | """ |
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179 | |
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180 | return self.is_valid and \ |
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181 | self.player is not None and \ |
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182 | self.player.is_playing |
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183 | |
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184 | @property |
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185 | def is_paused(self): |
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186 | """Whether the job is currently paused. |
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187 | |
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188 | """ |
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189 | |
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190 | return self.is_valid and \ |
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191 | self.player is not None and \ |
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192 | self.player.is_paused |
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193 | |
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194 | @property |
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195 | def is_done(self): |
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196 | """Whether the job is done playing, regardless of whether it |
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197 | completed successfully or not. |
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198 | |
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199 | """ |
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200 | |
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201 | return (self.is_valid and \ |
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202 | self.player is not None and \ |
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203 | self.player.is_done) or \ |
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204 | (self._why_done == "cancelled" or \ |
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205 | self._why_done == "aborted") |
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206 | |
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207 | @property |
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208 | def is_completed(self): |
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209 | """Whether the job completed successfully. |
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210 | |
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211 | """ |
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212 | |
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213 | return self.is_done and self._why_done == "completed" |
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214 | |
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215 | @property |
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216 | def is_cancelled(self): |
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217 | """Whether the job was cancelled. |
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218 | |
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219 | """ |
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220 | |
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221 | return self.is_done and self._why_done == "cancelled" |
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222 | |
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223 | @property |
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224 | def is_aborted(self): |
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225 | """Whether the job was aborted. |
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226 | |
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227 | """ |
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228 | |
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229 | return self.is_done and self._why_done == "aborted" |
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230 | |
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231 | @property |
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232 | def state(self): |
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233 | """State status codes (these are equivalent to the IPP |
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234 | job-state status codes). State transitions are as follows: |
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235 | |
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236 | HELD ---> PENDING ---> PROCESSING <--> STOPPED (aka paused) |
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237 | ^ |---> CANCELLED |
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238 | | |---> ABORTED |
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239 | | |---> COMPLETE ---| |
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240 | |--------------------------------| |
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241 | |
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242 | """ |
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243 | |
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244 | if self.is_ready: |
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245 | state = States.PENDING |
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246 | elif self.is_playing and not self.is_paused: |
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247 | state = States.PROCESSING |
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248 | elif self.is_playing and self.is_paused: |
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249 | state = States.STOPPED |
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250 | elif self.is_completed: |
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251 | state = States.COMPLETE |
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252 | elif self.is_cancelled: |
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253 | state = States.CANCELLED |
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254 | elif self.is_aborted: |
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255 | state = States.ABORTED |
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256 | else: |
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257 | state = States.HELD |
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258 | return state |
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259 | |
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260 | ###################################################################### |
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261 | ### Methods ### |
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262 | ###################################################################### |
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263 | |
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264 | @staticmethod |
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265 | def verify_document(document): |
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266 | """Verifies that a document has the 'name', 'read', and |
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267 | 'close' attributes (i.e., it should be like a file object). |
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268 | |
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269 | """ |
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270 | |
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271 | if not hasattr(document, "name"): |
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272 | raise errors.InvalidDocument, "no name attribute" |
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273 | if not hasattr(document, "read"): |
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274 | raise errors.InvalidDocument, "no read attribute" |
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275 | if not hasattr(document, "close"): |
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276 | raise errors.InvalidDocument, "no close attribute" |
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277 | if not hasattr(document, "closed"): |
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278 | raise errors.InvalidDocument, "no closed attribute" |
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279 | |
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280 | def spool(self, document=None): |
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281 | """Non-blocking spool. Job must be valid (see |
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282 | 'GutenbachJob.is_valid'), and the document must be an open |
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283 | file handler. |
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284 | |
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285 | Raises |
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286 | ------ |
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287 | InvalidDocument |
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288 | If the document is not valid. |
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289 | InvalidJobStateException |
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290 | If the job is not valid or it is already |
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291 | spooled/ready/finished. |
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292 | |
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293 | """ |
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294 | |
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295 | if not self.is_valid or self.state != States.HELD: |
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296 | raise errors.InvalidJobStateException(self.state) |
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297 | self.verify_document(document) |
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298 | self.document = document.name |
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299 | self.player = Player(document) |
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300 | logger.debug("document for job %d is '%s'" % (self.id, self.document)) |
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301 | |
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302 | def play(self): |
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303 | """Non-blocking play. Job must be ready (see |
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304 | 'GutenbachJob.is_ready'). |
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305 | |
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306 | Raises |
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307 | ------ |
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308 | InvalidJobStateException |
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309 | If the job is not ready to be played. |
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310 | |
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311 | """ |
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312 | |
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313 | # make sure the job is waiting to be played and that it's |
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314 | # valid |
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315 | if not self.is_ready: |
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316 | raise errors.InvalidJobStateException(self.state) |
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317 | |
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318 | # and set the state to processing if we're good to go |
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319 | logger.info("playing job %s" % str(self)) |
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320 | |
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321 | def _completed(): |
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322 | logger.info("completed job %s" % str(self)) |
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323 | self._why_done = "completed" |
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324 | self.player.callback = _completed |
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325 | self.player.start() |
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326 | |
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327 | def pause(self): |
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328 | """Non-blocking pause. Job must be playing (see |
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329 | 'GutenbachJob.is_playing'). |
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330 | |
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331 | Raises |
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332 | ------ |
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333 | InvalidJobStateException |
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334 | If the job is not playing. |
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335 | |
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336 | """ |
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337 | |
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338 | if not self.is_playing: |
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339 | raise errors.InvalidJobStateException(self.state) |
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340 | self.player.mplayer_pause() |
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341 | |
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342 | def resume(self): |
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343 | """Non-blocking resume. Job must be paused (see |
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344 | 'GutenbachJob.is_paused'). |
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345 | |
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346 | Raises |
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347 | ------ |
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348 | InvalidJobStateException |
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349 | If the job is not paused. |
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350 | |
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351 | """ |
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352 | if not self.is_paused: |
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353 | raise errors.InvalidJobStateException(self.state) |
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354 | self.player.mplayer_pause() |
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355 | |
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356 | def cancel(self): |
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357 | """Blocking cancel. The job must not have been previously |
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358 | aborted or completed (though this method will succeed if it |
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359 | was previously cancelled). This should be used to stop the |
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360 | job following an external request. |
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361 | |
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362 | Raises |
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363 | ------ |
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364 | InvalidJobStateException |
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365 | If the job has already finished. |
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366 | |
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367 | """ |
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368 | |
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369 | if self.is_playing: |
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370 | self.player._callback = None |
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371 | self.player.mplayer_stop() |
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372 | |
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373 | elif self.is_done and not self._why_done == "cancelled": |
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374 | raise errors.InvalidJobStateException(self.state) |
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375 | |
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376 | logger.info("cancelled job %s" % str(self)) |
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377 | self._why_done = "cancelled" |
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378 | |
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379 | def abort(self): |
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380 | """Blocking abort. The job must not have been previously |
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381 | cancelled or completed (though this method will succeed if it |
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382 | was previously aborted). This should be used to stop the job |
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383 | following internal errors. |
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384 | |
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385 | Raises |
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386 | ------ |
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387 | InvalidJobStateException |
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388 | If the job has already finished. |
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389 | |
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390 | """ |
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391 | |
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392 | if self.is_playing: |
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393 | self.player._callback = None |
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394 | self.player.mplayer_stop() |
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395 | |
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396 | elif self.is_done and not self._why_done == "aborted": |
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397 | raise errors.InvalidJobStateException(self.state) |
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398 | |
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399 | logger.info("aborted job %s" % str(self)) |
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400 | self._why_done = "aborted" |
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401 | |
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402 | def restart(self): |
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403 | """Non-blocking restart. Job must be finished (see |
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404 | 'GutenbachJob.is_done'), and will be ready to be played (see |
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405 | 'GutenbachJob.is_ready') if this method is successful. |
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406 | |
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407 | Raises |
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408 | ------ |
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409 | InvalidJobStateException |
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410 | If the job is not done. |
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411 | |
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412 | """ |
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413 | |
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414 | if not self.is_done: |
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415 | raise errors.InvalidJobStateException(self.state) |
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416 | |
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417 | logger.debug("restarting job %d" % (self.id, self.document)) |
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418 | |
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419 | self._why_done = None |
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420 | self.spool(self.document) |
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