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1 #!/usr/bin/python2.5 |
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2 # |
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3 # Copyright 2009 the Melange authors. |
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4 # |
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5 # Licensed under the Apache License, Version 2.0 (the "License"); |
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6 # you may not use this file except in compliance with the License. |
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7 # You may obtain a copy of the License at |
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8 # |
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9 # http://www.apache.org/licenses/LICENSE-2.0 |
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10 # |
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11 # Unless required by applicable law or agreed to in writing, software |
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12 # distributed under the License is distributed on an "AS IS" BASIS, |
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13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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14 # See the License for the specific language governing permissions and |
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15 # limitations under the License. |
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16 |
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17 """Appengine Task to convert the Student datastore model to contain |
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18 school_type. |
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19 """ |
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20 |
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21 __authors__ = [ |
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22 '"Madhusudan.C.S" <madhusudancs@gmail.com>', |
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23 '"Lennard de Rijk" <ljvderijk@gmail.com>', |
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24 ] |
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25 |
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26 |
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27 from google.appengine.api.labs import taskqueue |
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28 from google.appengine.ext import db |
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29 |
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30 from django.http import HttpResponse |
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31 |
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32 from soc.views.helper import responses |
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33 |
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34 |
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35 # batch size to use when going through Student entities. |
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36 DEF_BATCH_SIZE = 25 |
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37 |
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38 |
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39 def startSchoolTypeUpdate(request, task_url): |
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40 """Spawns a task for initiating the Student model conversion to include |
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41 school type. |
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42 |
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43 Args: |
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44 request: Django Request object |
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45 task_url: The URL used to run this update task |
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46 |
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47 Returns: |
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48 True iff the new task is successfully added to the Task Queue API |
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49 """ |
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50 |
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51 new_task = taskqueue.Task(url=task_url) |
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52 new_task.add() |
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53 |
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54 return True |
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55 |
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56 |
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57 def runSchoolTypeUpdate(request, *args, **kwargs): |
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58 """Appengine Task that adds school_type as University for existing |
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59 Student entities in batches. |
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60 |
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61 Addition of required school_type property to Student model |
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62 requires addition of corresponding value to all the existing |
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63 Student entities in the datastore. Since this property is introduced |
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64 during GSoC 2009 all students should be University students. |
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65 This task sets the school_type value to "University" to |
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66 all the existing entities. |
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67 |
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68 Args: |
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69 request: Django Request object |
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70 """ |
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71 |
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72 from soc.logic.models.student import logic as student_logic |
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73 from soc.models.student import Student |
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74 |
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75 fields = {} |
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76 |
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77 post_dict = request.POST |
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78 |
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79 start_key = post_dict.get('start_key') |
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80 |
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81 if start_key: |
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82 # retrieve the last student entity that was converted |
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83 start = student_logic.getFromKeyName(start_key) |
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84 |
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85 if not start: |
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86 # invalid starting student key specified, log and return OK |
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87 return error_handler.logErrorAndReturnOK( |
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88 'Invalid Student Key specified: %s' %(start_key)) |
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89 |
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90 fields['__key__ >'] = start.key() |
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91 |
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92 # get the first batch_size number of StudentProjects |
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93 entities = student_logic.getForFields(fields, limit=DEF_BATCH_SIZE) |
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94 |
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95 for entity in entities: |
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96 entity.school_type = 'University' |
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97 |
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98 db.put(entities) |
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99 |
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100 if len(entities) == DEF_BATCH_SIZE: |
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101 # spawn new task starting from the last |
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102 new_start = entities[DEF_BATCH_SIZE-1].key().id_or_name() |
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103 |
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104 # pass along these params as POST to the new task |
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105 task_params = {'start_key': new_start} |
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106 |
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107 new_task = taskqueue.Task(params=task_params, url=request['PATH_INFO']) |
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108 new_task.add() |
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109 |
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110 # task completed, return OK |
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111 return HttpResponse('OK') |