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1# This file is part of obs_base. 

2# 

3# Developed for the LSST Data Management System. 

4# This product includes software developed by the LSST Project 

5# (http://www.lsst.org). 

6# See the COPYRIGHT file at the top-level directory of this distribution 

7# for details of code ownership. 

8# 

9# This program is free software: you can redistribute it and/or modify 

10# it under the terms of the GNU General Public License as published by 

11# the Free Software Foundation, either version 3 of the License, or 

12# (at your option) any later version. 

13# 

14# This program is distributed in the hope that it will be useful, 

15# but WITHOUT ANY WARRANTY; without even the implied warranty of 

16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

17# GNU General Public License for more details. 

18# 

19# You should have received a copy of the GNU General Public License 

20# along with this program. If not, see <http://www.gnu.org/licenses/>. 

21"""Classes used in `RepoWalker` construction. 

22 

23The objects here form a temporary tree that is pruned and then transformed 

24into a similar tree of `PathElementHandler` instances. See `BuilderNode` 

25method documentation for more information. 

26""" 

27from __future__ import annotations 

28 

29__all__ = ["BuilderSkipInput", "BuilderTargetInput", "BuilderTree"] 

30 

31from abc import ABC, abstractmethod 

32import os 

33import re 

34from typing import ( 

35 Any, 

36 Dict, 

37 List, 

38 Optional, 

39 Tuple, 

40) 

41 

42from lsst.daf.butler import DatasetType, DimensionUniverse, StorageClass 

43from ..translators import Translator 

44from .parser import PathElementParser 

45from .scanner import PathElementHandler, DirectoryScanner 

46from .handlers import (IgnoreHandler, SubdirectoryHandler, SkipHandler, 

47 TargetFileHandler, MultiExtensionFileHandler) 

48 

49 

50class BuilderNode(ABC): 

51 """Abstract interface for nodes in the temporary tree that is used to 

52 construct a `RepoWalker`. 

53 """ 

54 

55 @abstractmethod 

56 def prune(self) -> Tuple[BuilderNode, List[str], bool]: 

57 """Attempt to prune this node and its children from the tree. 

58 

59 Returns 

60 ------- 

61 replacement : `BuilderNode` 

62 The result of recursively pruning child nodes; often just ``self``. 

63 messages : `list` [`str`] 

64 Warning messages that should be logged by a parent node when a 

65 matching path element is encountered, if this node is pruned. 

66 prune : `bool` 

67 If `True`, this node may be pruned from the tree (but will not 

68 necessarily be - it may correspond to a path element that should 

69 be skipped with siblings that should not be). 

70 """ 

71 raise NotImplementedError() 

72 

73 @abstractmethod 

74 def build(self, parser: PathElementParser, allKeys: Dict[str, type], cumulativeKeys: Dict[str, type], *, 

75 fileIgnoreRegEx: Optional[re.Pattern], dirIgnoreRegEx: Optional[re.Pattern] 

76 ) -> PathElementHandler: 

77 """Transform this node in the build tree into a corresponding 

78 `PathElementHandler`, recursing to any children. 

79 

80 Must be called after `prune`. 

81 

82 Parameters 

83 ---------- 

84 parser : `PathElementParser` 

85 An object that matches the path element the new handler is 

86 responsible for and extracts a (partial) Gen2 data ID from it. 

87 allKeys : `dict` [`str`, `type`] 

88 A mapping from Gen2 data ID key to the type of its value. Will 

89 contain all keys that may be extracted by the given parser, and 

90 possibly others. 

91 cumulativeKeys : `dict` [`str`, `type`], optional 

92 A dictionary containing key strings and types for Gen2 data ID keys 

93 that have been extracted from previous path elements for this 

94 template, including those extracted by ``parser``. 

95 

96 Returns 

97 ------- 

98 handler : `PathElementHandler` 

99 A new handler object. 

100 """ 

101 raise NotImplementedError() 

102 

103 

104class BuilderInput(BuilderNode): 

105 """An intermediate base for `BuilderNode` classes that are provided as 

106 direct inputs to a `RepoWalker`, and generally correspond to exactly one 

107 Gen2 dataset type. 

108 

109 Parameters 

110 ---------- 

111 template : `str` 

112 The complete Gen2 template to be matched (not just the template for 

113 one path element). 

114 keys : `dict` [`str`, `type`] 

115 A mapping from Gen2 data ID key to the type of its value. 

116 """ 

117 def __init__(self, template: str, keys: Dict[str, type]): 

118 self.template = template 

119 self.keys = keys 

120 self.elements = self.template.split(os.path.sep) 

121 

122 template: str 

123 """The complete Gen2 template to be matched (`str`). 

124 """ 

125 

126 keys: Dict[str, type] 

127 """A mapping from Gen2 data ID key to the type of its value 

128 (`dict` [`str`, `type`]). 

129 """ 

130 

131 elements: List[str] 

132 """The path elements (file or directory levels) of `template` 

133 (`list` of `str`). 

134 """ 

135 

136 

137class BuilderSkipInput(BuilderInput): 

138 """An input to a `RepoWalker` that indicates that matched files should be 

139 skipped, possibly with a warning message. 

140 

141 BuilderSkipInputs can be pruned. When they are not pruned, they build 

142 `SkipHandler` instances. 

143 

144 Parameters 

145 ---------- 

146 template : `str` 

147 The complete Gen2 template to be matched (not just the template for 

148 one path element). 

149 keys : `dict` [`str`, `type`] 

150 A mapping from Gen2 data ID key to the type of its value. 

151 message : `str`, optional 

152 If not `None`, a warning message that should be printed either when a 

153 matching file is enountered or a directory that may contain such files 

154 is skipped. 

155 isForFiles : `bool`, optional 

156 If `True` (default), this handler should be run on files. Otherwise it 

157 should be run on directories. 

158 """ 

159 def __init__(self, template: str, keys: Dict[str, type], message: Optional[str] = None, *, 

160 isForFiles: bool = True): 

161 super().__init__(template=template, keys=keys) 

162 self._message = message 

163 self._isForFiles = isForFiles 

164 

165 def build(self, parser: PathElementParser, allKeys: Dict[str, type], cumulativeKeys: Dict[str, type], *, 

166 fileIgnoreRegEx: Optional[re.Pattern], dirIgnoreRegEx: Optional[re.Pattern] 

167 ) -> PathElementHandler: 

168 # Docstring inherited from BuilderNode. 

169 return SkipHandler(parser=parser, isForFiles=self._isForFiles, message=self._message) 

170 

171 def prune(self) -> Tuple[BuilderNode, List[str], bool]: 

172 # Docstring inherited from BuilderNode. 

173 return self, [self._message] if self._message is not None else [], True 

174 

175 

176class BuilderTargetInput(BuilderInput): 

177 """An input to a `RepoWalker` that matches files that correspond to 

178 datasets that we want to extract. 

179 

180 BuilderTargetInputs can never be pruned, and always build 

181 `TargetFileHandler` instances. 

182 

183 Parameters 

184 ---------- 

185 datasetTypeName : `str` 

186 Name of the dataset type. 

187 template : `str` 

188 Full Gen2 filename template. 

189 keys : `dict` [`str`, `type`] 

190 Dictionary that maps Gen2 data ID key to the type of its value. 

191 storageClass : `StorageClass` 

192 `StorageClass` for the Gen3 dataset type. 

193 universe : `DimensionUniverse` 

194 All candidate dimensions for the Gen3 dataset type. 

195 kwargs: 

196 Additional keyword arguments are passed to `Translator.makeMatching`, 

197 in along with ``datasetTypeName`` and ``keys``. 

198 """ 

199 def __init__(self, *, datasetTypeName: str, template: str, keys: Dict[str, type], 

200 storageClass: StorageClass, universe: DimensionUniverse, **kwargs: Any): 

201 # strip off [%HDU] identifiers from e.g. DECAM Community Pipeline products 

202 template = template.split('[%(')[0] 

203 super().__init__(template=template, keys=keys) 

204 self._translator = Translator.makeMatching(datasetTypeName, keys, **kwargs) 

205 self.datasetType = DatasetType(datasetTypeName, dimensions=self._translator.dimensionNames, 

206 storageClass=storageClass, universe=universe) 

207 

208 def build(self, parser: PathElementParser, allKeys: Dict[str, type], cumulativeKeys: Dict[str, type], *, 

209 fileIgnoreRegEx: Optional[re.Pattern], dirIgnoreRegEx: Optional[re.Pattern] 

210 ) -> PathElementHandler: 

211 # Docstring inherited from BuilderNode. 

212 if self.datasetType.name == 'cpBias' or self.datasetType.name == 'cpFlat': 

213 # 'cpBias'/'cpFlat' are DECam Community Pipeline calibrations 

214 # stored as multi-extension FITS files. 

215 return MultiExtensionFileHandler(parser=parser, 

216 translator=self._translator, 

217 datasetType=self.datasetType) 

218 else: 

219 return TargetFileHandler(parser=parser, translator=self._translator, datasetType=self.datasetType) 

220 

221 def prune(self) -> Tuple[BuilderNode, List[str], bool]: 

222 # Docstring inherited from BuilderNode. 

223 return self, [], False 

224 

225 datasetType: DatasetType 

226 """The Gen3 dataset type extracted by the hander this object builds 

227 (`lsst.daf.butler.DatasetType`). 

228 """ 

229 

230 

231class BuilderPrunedTree(BuilderNode): 

232 """A `BuilderNode` that represents a subdirectory to be skipped, 

233 created by pruning `BuilderTree` that contained only `BuilderSkipInput` 

234 instances. 

235 

236 BuilderPrunedTrees can be pruned. When they are not pruned, they 

237 build `SkipHandler` instances. 

238 

239 Parameters 

240 ---------- 

241 messages : `list` [`str`] 

242 A list of warning messages to be printed when the handler produced by 

243 this builder matches a subdirectory. 

244 """ 

245 

246 def __init__(self, messages: List[str]): 

247 self._messages = messages 

248 

249 def build(self, parser: PathElementParser, allKeys: Dict[str, type], cumulativeKeys: Dict[str, type], *, 

250 fileIgnoreRegEx: Optional[re.Pattern], dirIgnoreRegEx: Optional[re.Pattern] 

251 ) -> PathElementHandler: 

252 # Docstring inherited from BuilderNode. 

253 message = "; ".join(self._messages) if self._messages else None 

254 return SkipHandler(parser=parser, isForFiles=False, message=message) 

255 

256 def prune(self) -> Tuple[BuilderNode, List[str], bool]: 

257 # Docstring inherited from BuilderNode. 

258 return self, self._messages, True 

259 

260 

261class BuilderDuplicateInputs(BuilderNode): 

262 """A `BuilderNode` that represents a collection of `BuilderInput` instances 

263 that all have the same template. 

264 """ 

265 def __init__(self, old: BuilderInput, new: BuilderInput): 

266 self._children = [] 

267 if isinstance(old, BuilderDuplicateInputs): 

268 self._children.extend(old._children) 

269 else: 

270 self._children.append(old) 

271 self._children.append(new) 

272 self._messages = [] # populated in prune() 

273 

274 def build(self, parser: PathElementParser, allKeys: Dict[str, type], cumulativeKeys: Dict[str, type], *, 

275 fileIgnoreRegEx: Optional[re.Pattern], dirIgnoreRegEx: Optional[re.Pattern] 

276 ) -> PathElementHandler: 

277 # Docstring inherited from BuilderNode. 

278 message = "; ".join(self._messages) if self._messages else None 

279 return SkipHandler(parser=parser, isForFiles=False, message=message) 

280 

281 def prune(self) -> Tuple[BuilderNode, List[str], bool]: 

282 # Docstring inherited from BuilderNode. 

283 unprunable = [] 

284 newChildren = [] 

285 for child in self._children: 

286 newChild, childMessages, toPruneChild = child.prune() 

287 if toPruneChild: 

288 self._messages.extend(childMessages) 

289 else: 

290 unprunable.append(newChild) 

291 newChildren.append(newChildren) 

292 self._children = newChildren 

293 if len(unprunable) == 0: 

294 # All children are just skips, so we can prune this node if we 

295 # remember their messages. 

296 return self, self._messages, True 

297 elif len(unprunable) == 1 and not self._messages: 

298 # Exactly one child is a target, and the others were ignored with 

299 # no warning messages. Tell parent node to just use that child, 

300 # so if we see any matching files, we just assume they're for that 

301 # target. 

302 return unprunable[0], [], False 

303 else: 

304 # Multiple targets or skips with messages, which means we won't 

305 # know how to handle any matching files. Replace any messages we 

306 # have with a single message that combines them all as well as 

307 # any target dataset types that they are ambiguous with. 

308 nested = [f"{c.datasetType.name} (target)" for c in unprunable] 

309 nested.extend(self._messages) 

310 self._messages = [f"ambiguous match: [{', '.join(nested)}]"] 

311 return self, self._messages, True 

312 

313 

314class BuilderTree(BuilderNode): 

315 """A `BuilderNode` that represents a directory. 

316 

317 This is the only `BuilderNode` class that is not a leaf node. If all 

318 of its children can be pruned, it is replaced by a `BuilderPrunedTree` 

319 (which can then be pruned itself). It builds `SubdirectoryHandler` 

320 instances when not pruned. 

321 """ 

322 def __init__(self): 

323 self._children = {} # Maps template path element to BuilderNode 

324 

325 def insert(self, level: int, leaf: BuilderInput): 

326 """Insert an input leaf node into the tree, recursively constructing 

327 intermediate parents in order to put it at the right level. 

328 

329 Parameters 

330 ---------- 

331 level : `int` 

332 The level ``self``is at in the larger tree, with zero the 

333 repository root. The right level for the leaf is given by the 

334 length of ``leaf.elements``. 

335 leaf : `BuilderInput` 

336 The leaf node to insert. 

337 """ 

338 nextLevel = level + 1 

339 element = leaf.elements[level] 

340 if nextLevel == len(leaf.elements): 

341 conflict = self._children.get(element) 

342 if conflict is not None: 

343 # Sadly, the Gen2 butler has some actual dataset types that 

344 # use the exact same template. 

345 leaf = BuilderDuplicateInputs(conflict, leaf) 

346 self._children[element] = leaf 

347 else: 

348 child = self._children.setdefault(element, BuilderTree()) 

349 child.insert(nextLevel, leaf) 

350 

351 def fill(self, scanner: DirectoryScanner, allKeys: Dict[str, type], previousKeys: Dict[str, type], *, 

352 fileIgnoreRegEx: Optional[re.Pattern], dirIgnoreRegEx: Optional[re.Pattern]): 

353 """Fill a `DirectoryScanner` instance by recursively building all 

354 child nodes. 

355 

356 Parameters 

357 ---------- 

358 scanner : `DirectoryScanner` 

359 Object to populate. 

360 allKeys : `dict` [`str`, `type`] 

361 Mapping from Gen2 data ID key to its value type, covering all keys 

362 that could be used in any child template. 

363 previousKeys : `dict` [`str`, `type`], optional 

364 A dictionary containing key strings and types for Gen2 data ID keys 

365 that have been extracted from previous path elements of the same 

366 template. 

367 """ 

368 if fileIgnoreRegEx is not None: 

369 scanner.add(IgnoreHandler(fileIgnoreRegEx, isForFiles=True)) 

370 if dirIgnoreRegEx is not None: 

371 scanner.add(IgnoreHandler(dirIgnoreRegEx, isForFiles=False)) 

372 for template, child in self._children.items(): 

373 parser = PathElementParser(template, allKeys, previousKeys=previousKeys) 

374 cumulativeKeys = previousKeys.copy() 

375 cumulativeKeys.update(parser.keys) 

376 scanner.add(child.build(parser, allKeys, cumulativeKeys, fileIgnoreRegEx=fileIgnoreRegEx, 

377 dirIgnoreRegEx=dirIgnoreRegEx)) 

378 

379 def prune(self) -> Tuple[BuilderNode, List[str], bool]: 

380 # Docstring inherited from BuilderNode. 

381 toPruneThis = True 

382 newChildren = {} 

383 messages = [] 

384 # Recursively prune children. 

385 for template, child in list(self._children.items()): 

386 newChild, childMessages, toPruneChild = child.prune() 

387 newChildren[template] = newChild 

388 messages.extend(childMessages) 

389 if not toPruneChild: 

390 toPruneThis = False 

391 self._children = newChildren 

392 if toPruneThis: 

393 return BuilderPrunedTree(messages), messages, True 

394 else: 

395 return self, [], False 

396 

397 def build(self, parser: PathElementParser, allKeys: Dict[str, type], cumulativeKeys: Dict[str, type], *, 

398 fileIgnoreRegEx: Optional[re.Pattern], dirIgnoreRegEx: Optional[re.Pattern] 

399 ) -> PathElementHandler: 

400 # Docstring inherited from BuilderNode. 

401 built = SubdirectoryHandler(parser) 

402 self.fill(built.scanner, allKeys, cumulativeKeys, fileIgnoreRegEx=fileIgnoreRegEx, 

403 dirIgnoreRegEx=dirIgnoreRegEx) 

404 return built