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annotate rhodecode/lib/caching_query.py @ 3574:000653f7cdf9 beta
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author | Mads Kiilerich <madski@unity3d.com> |
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date | Thu, 21 Mar 2013 11:17:01 +0100 |
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1 """caching_query.py |
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2 |
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3 Represent persistence structures which allow the usage of |
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4 Beaker caching with SQLAlchemy. |
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5 |
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6 The three new concepts introduced here are: |
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7 |
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8 * CachingQuery - a Query subclass that caches and |
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9 retrieves results in/from Beaker. |
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10 * FromCache - a query option that establishes caching |
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11 parameters on a Query |
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12 * RelationshipCache - a variant of FromCache which is specific |
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13 to a query invoked during a lazy load. |
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14 * _params_from_query - extracts value parameters from |
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15 a Query. |
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16 |
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17 The rest of what's here are standard SQLAlchemy and |
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18 Beaker constructs. |
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19 |
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20 """ |
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21 import beaker |
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22 from beaker.exceptions import BeakerException |
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23 |
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24 from sqlalchemy.orm.interfaces import MapperOption |
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25 from sqlalchemy.orm.query import Query |
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26 from sqlalchemy.sql import visitors |
2109 | 27 from rhodecode.lib.utils2 import safe_str |
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28 |
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29 |
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30 class CachingQuery(Query): |
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31 """A Query subclass which optionally loads full results from a Beaker |
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32 cache region. |
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33 |
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34 The CachingQuery stores additional state that allows it to consult |
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35 a Beaker cache before accessing the database: |
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36 |
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37 * A "region", which is a cache region argument passed to a |
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38 Beaker CacheManager, specifies a particular cache configuration |
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39 (including backend implementation, expiration times, etc.) |
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40 * A "namespace", which is a qualifying name that identifies a |
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41 group of keys within the cache. A query that filters on a name |
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42 might use the name "by_name", a query that filters on a date range |
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43 to a joined table might use the name "related_date_range". |
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44 |
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45 When the above state is present, a Beaker cache is retrieved. |
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46 |
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47 The "namespace" name is first concatenated with |
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48 a string composed of the individual entities and columns the Query |
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49 requests, i.e. such as ``Query(User.id, User.name)``. |
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50 |
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51 The Beaker cache is then loaded from the cache manager based |
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52 on the region and composed namespace. The key within the cache |
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53 itself is then constructed against the bind parameters specified |
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54 by this query, which are usually literals defined in the |
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55 WHERE clause. |
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56 |
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57 The FromCache and RelationshipCache mapper options below represent |
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58 the "public" method of configuring this state upon the CachingQuery. |
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59 |
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60 """ |
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61 |
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62 def __init__(self, manager, *args, **kw): |
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63 self.cache_manager = manager |
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64 Query.__init__(self, *args, **kw) |
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65 |
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66 def __iter__(self): |
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67 """override __iter__ to pull results from Beaker |
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68 if particular attributes have been configured. |
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69 |
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70 Note that this approach does *not* detach the loaded objects from |
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71 the current session. If the cache backend is an in-process cache |
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72 (like "memory") and lives beyond the scope of the current session's |
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73 transaction, those objects may be expired. The method here can be |
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74 modified to first expunge() each loaded item from the current |
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75 session before returning the list of items, so that the items |
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76 in the cache are not the same ones in the current Session. |
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77 |
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78 """ |
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79 if hasattr(self, '_cache_parameters'): |
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80 return self.get_value(createfunc=lambda: |
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81 list(Query.__iter__(self))) |
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82 else: |
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83 return Query.__iter__(self) |
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84 |
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85 def invalidate(self): |
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86 """Invalidate the value represented by this Query.""" |
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87 |
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88 cache, cache_key = _get_cache_parameters(self) |
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89 cache.remove(cache_key) |
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90 |
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91 def get_value(self, merge=True, createfunc=None): |
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92 """Return the value from the cache for this query. |
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93 |
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94 Raise KeyError if no value present and no |
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95 createfunc specified. |
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96 |
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97 """ |
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98 cache, cache_key = _get_cache_parameters(self) |
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99 ret = cache.get_value(cache_key, createfunc=createfunc) |
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100 if merge: |
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101 ret = self.merge_result(ret, load=False) |
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102 return ret |
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103 |
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104 def set_value(self, value): |
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105 """Set the value in the cache for this query.""" |
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106 |
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107 cache, cache_key = _get_cache_parameters(self) |
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108 cache.put(cache_key, value) |
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109 |
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110 |
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111 def query_callable(manager, query_cls=CachingQuery): |
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112 def query(*arg, **kw): |
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113 return query_cls(manager, *arg, **kw) |
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114 return query |
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115 |
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116 |
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117 def get_cache_region(name, region): |
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118 if region not in beaker.cache.cache_regions: |
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119 raise BeakerException('Cache region `%s` not configured ' |
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120 'Check if proper cache settings are in the .ini files' % region) |
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121 kw = beaker.cache.cache_regions[region] |
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122 return beaker.cache.Cache._get_cache(name, kw) |
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123 |
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124 |
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125 def _get_cache_parameters(query): |
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126 """For a query with cache_region and cache_namespace configured, |
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127 return the correspoinding Cache instance and cache key, based |
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128 on this query's current criterion and parameter values. |
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129 |
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130 """ |
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131 if not hasattr(query, '_cache_parameters'): |
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132 raise ValueError("This Query does not have caching " |
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133 "parameters configured.") |
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134 |
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135 region, namespace, cache_key = query._cache_parameters |
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136 |
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137 namespace = _namespace_from_query(namespace, query) |
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138 |
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139 if cache_key is None: |
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140 # cache key - the value arguments from this query's parameters. |
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141 args = [safe_str(x) for x in _params_from_query(query)] |
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142 args.extend(filter(lambda k: k not in ['None', None, u'None'], |
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143 [str(query._limit), str(query._offset)])) |
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144 |
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145 cache_key = " ".join(args) |
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146 |
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147 if cache_key is None: |
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148 raise Exception('Cache key cannot be None') |
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149 |
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150 # get cache |
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151 #cache = query.cache_manager.get_cache_region(namespace, region) |
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152 cache = get_cache_region(namespace, region) |
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153 # optional - hash the cache_key too for consistent length |
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154 # import uuid |
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155 # cache_key= str(uuid.uuid5(uuid.NAMESPACE_DNS, cache_key)) |
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156 |
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157 return cache, cache_key |
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158 |
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159 |
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160 def _namespace_from_query(namespace, query): |
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161 # cache namespace - the token handed in by the |
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162 # option + class we're querying against |
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163 namespace = " ".join([namespace] + [str(x) for x in query._entities]) |
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164 |
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165 # memcached wants this |
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166 namespace = namespace.replace(' ', '_') |
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167 |
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168 return namespace |
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169 |
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170 |
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171 def _set_cache_parameters(query, region, namespace, cache_key): |
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172 |
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173 if hasattr(query, '_cache_parameters'): |
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174 region, namespace, cache_key = query._cache_parameters |
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175 raise ValueError("This query is already configured " |
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176 "for region %r namespace %r" % |
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177 (region, namespace) |
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178 ) |
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179 query._cache_parameters = region, namespace, cache_key |
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180 |
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181 |
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182 class FromCache(MapperOption): |
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183 """Specifies that a Query should load results from a cache.""" |
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184 |
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185 propagate_to_loaders = False |
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186 |
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187 def __init__(self, region, namespace, cache_key=None): |
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188 """Construct a new FromCache. |
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189 |
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190 :param region: the cache region. Should be a |
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191 region configured in the Beaker CacheManager. |
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192 |
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193 :param namespace: the cache namespace. Should |
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194 be a name uniquely describing the target Query's |
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195 lexical structure. |
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196 |
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197 :param cache_key: optional. A string cache key |
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198 that will serve as the key to the query. Use this |
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199 if your query has a huge amount of parameters (such |
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200 as when using in_()) which correspond more simply to |
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201 some other identifier. |
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202 |
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203 """ |
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204 self.region = region |
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205 self.namespace = namespace |
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206 self.cache_key = cache_key |
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207 |
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208 def process_query(self, query): |
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209 """Process a Query during normal loading operation.""" |
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210 |
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211 _set_cache_parameters(query, self.region, self.namespace, |
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212 self.cache_key) |
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213 |
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214 |
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215 class RelationshipCache(MapperOption): |
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216 """Specifies that a Query as called within a "lazy load" |
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217 should load results from a cache.""" |
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218 |
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219 propagate_to_loaders = True |
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220 |
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221 def __init__(self, region, namespace, attribute): |
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222 """Construct a new RelationshipCache. |
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223 |
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224 :param region: the cache region. Should be a |
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225 region configured in the Beaker CacheManager. |
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226 |
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227 :param namespace: the cache namespace. Should |
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228 be a name uniquely describing the target Query's |
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229 lexical structure. |
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230 |
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231 :param attribute: A Class.attribute which |
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232 indicates a particular class relationship() whose |
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233 lazy loader should be pulled from the cache. |
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234 |
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235 """ |
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236 self.region = region |
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237 self.namespace = namespace |
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238 self._relationship_options = { |
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239 (attribute.property.parent.class_, attribute.property.key): self |
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240 } |
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241 |
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242 def process_query_conditionally(self, query): |
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243 """Process a Query that is used within a lazy loader. |
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244 |
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245 (the process_query_conditionally() method is a SQLAlchemy |
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246 hook invoked only within lazyload.) |
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247 |
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248 """ |
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249 if query._current_path: |
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250 mapper, key = query._current_path[-2:] |
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251 |
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252 for cls in mapper.class_.__mro__: |
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253 if (cls, key) in self._relationship_options: |
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254 relationship_option = \ |
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255 self._relationship_options[(cls, key)] |
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256 _set_cache_parameters( |
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257 query, |
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258 relationship_option.region, |
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259 relationship_option.namespace, |
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260 None) |
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261 |
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262 def and_(self, option): |
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263 """Chain another RelationshipCache option to this one. |
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264 |
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265 While many RelationshipCache objects can be specified on a single |
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266 Query separately, chaining them together allows for a more efficient |
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267 lookup during load. |
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268 |
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269 """ |
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270 self._relationship_options.update(option._relationship_options) |
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271 return self |
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272 |
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273 |
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274 def _params_from_query(query): |
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275 """Pull the bind parameter values from a query. |
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276 |
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277 This takes into account any scalar attribute bindparam set up. |
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278 |
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279 E.g. params_from_query(query.filter(Cls.foo==5).filter(Cls.bar==7))) |
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280 would return [5, 7]. |
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281 |
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282 """ |
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283 v = [] |
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284 def visit_bindparam(bind): |
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285 |
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286 if bind.key in query._params: |
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287 value = query._params[bind.key] |
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288 elif bind.callable: |
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289 # lazyloader may dig a callable in here, intended |
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290 # to late-evaluate params after autoflush is called. |
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291 # convert to a scalar value. |
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292 value = bind.callable() |
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293 else: |
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294 value = bind.value |
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295 |
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296 v.append(value) |
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297 if query._criterion is not None: |
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298 visitors.traverse(query._criterion, {}, {'bindparam':visit_bindparam}) |
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299 for f in query._from_obj: |
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300 visitors.traverse(f, {}, {'bindparam':visit_bindparam}) |
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301 return v |