rebaseline_server: add --compare-configs option

gm/rebaseline_server/results.py

Index: gm/rebaseline_server/results.py
diff --git a/gm/rebaseline_server/results.py b/gm/rebaseline_server/results.py
index aadb6a7851e3e578b36eb792674f1f41831aa513..7cf57453ca64307ef69cfd69e92c870bb7988f72 100755
--- a/gm/rebaseline_server/results.py
+++ b/gm/rebaseline_server/results.py
@@ -10,6 +10,7 @@ Repackage expected/actual GM results as needed by our HTML rebaseline viewer.
 """
 
 # System-level imports
+import fnmatch
 import os
 import re
 import sys
@@ -26,6 +27,7 @@ GM_DIRECTORY = os.path.dirname(PARENT_DIRECTORY)
 if GM_DIRECTORY not in sys.path:
   sys.path.append(GM_DIRECTORY)
 import gm_json
+import imagepairset
 
 # Keys used to link an image to a particular GM test.
 # NOTE: Keep these in sync with static/constants.js
@@ -56,3 +58,142 @@ KEY__RESULT_TYPE__SUCCEEDED = gm_json.JSONKEY_ACTUALRESULTS_SUCCEEDED
 
 IMAGE_FILENAME_RE = re.compile(gm_json.IMAGE_FILENAME_PATTERN)
 IMAGE_FILENAME_FORMATTER = '%s_%s.png'  # pass in (testname, config)
+
+# Ignore expectations/actuals for builders matching any of these patterns.
+# This allows us to ignore builders for which we don't maintain expectations
+# (trybots, Valgrind, ASAN, TSAN), and avoid problems like
+# https://code.google.com/p/skia/issues/detail?id=2036 ('rebaseline_server
+# produces error when trying to add baselines for ASAN/TSAN builders')
+SKIP_BUILDERS_PATTERN_LIST = [re.compile(p) for p in [
+    '.*-Trybot', '.*Valgrind.*', '.*TSAN.*', '.*ASAN.*']]
+
+DEFAULT_ACTUALS_DIR = '.gm-actuals'
+DEFAULT_GENERATED_IMAGES_ROOT = os.path.join(
+    PARENT_DIRECTORY, '.generated-images')
+
+
+class BaseComparisons(object):
+  """Base class for generating summary of comparisons between two image sets.
+  """
+
+  def __init__(self):
+    raise NotImplementedError('cannot instantiate the abstract base class')
+
+  def get_results_of_type(self, results_type):
+    """Return results of some/all tests (depending on 'results_type' parameter).
+
+    Args:
+      results_type: string describing which types of results to include; must
+          be one of the RESULTS_* constants
+
+    Results are returned in a dictionary as output by ImagePairSet.as_dict().
+    """
+    return self._results[results_type]
+
+  def get_packaged_results_of_type(self, results_type, reload_seconds=None,
+                                   is_editable=False, is_exported=True):
+    """Package the results of some/all tests as a complete response_dict.
+
+    Args:
+      results_type: string indicating which set of results to return;
+          must be one of the RESULTS_* constants
+      reload_seconds: if specified, note that new results may be available once
+          these results are reload_seconds old
+      is_editable: whether clients are allowed to submit new baselines
+      is_exported: whether these results are being made available to other
+          network hosts
+    """
+    response_dict = self._results[results_type]
+    time_updated = self.get_timestamp()
+    response_dict[KEY__HEADER] = {
+        KEY__HEADER__SCHEMA_VERSION: (
+            REBASELINE_SERVER_SCHEMA_VERSION_NUMBER),
+
+        # Timestamps:
+        # 1. when this data was last updated
+        # 2. when the caller should check back for new data (if ever)
+        KEY__HEADER__TIME_UPDATED: time_updated,
+        KEY__HEADER__TIME_NEXT_UPDATE_AVAILABLE: (
+            (time_updated+reload_seconds) if reload_seconds else None),
+
+        # The type we passed to get_results_of_type()
+        KEY__HEADER__TYPE: results_type,
+
+        # Hash of dataset, which the client must return with any edits--
+        # this ensures that the edits were made to a particular dataset.
+        KEY__HEADER__DATAHASH: str(hash(repr(
+            response_dict[imagepairset.KEY__IMAGEPAIRS]))),
+
+        # Whether the server will accept edits back.
+        KEY__HEADER__IS_EDITABLE: is_editable,
+
+        # Whether the service is accessible from other hosts.
+        KEY__HEADER__IS_EXPORTED: is_exported,
+    }
+    return response_dict
+
+  def get_timestamp(self):
+    """Return the time at which this object was created, in seconds past epoch
+    (UTC).
+    """
+    return self._timestamp
+
+  @staticmethod
+  def _ignore_builder(builder):
+    """Returns True if this builder matches any of SKIP_BUILDERS_PATTERN_LIST.
+
+    Args:
+      builder: name of this builder, as a string
+
+    Returns:
+      True if we should ignore expectations and actuals for this builder.
+    """
+    for pattern in SKIP_BUILDERS_PATTERN_LIST:
+      if pattern.match(builder):
+        return True
+    return False
+
+  @staticmethod
+  def _read_dicts_from_root(root, pattern='*.json'):
+    """Read all JSON dictionaries within a directory tree.
+
+    Args:
+      root: path to root of directory tree
+      pattern: which files to read within root (fnmatch-style pattern)
+
+    Returns:
+      A meta-dictionary containing all the JSON dictionaries found within
+      the directory tree, keyed by the builder name of each dictionary.
+
+    Raises:
+      IOError if root does not refer to an existing directory
+    """
+    if not os.path.isdir(root):
+      raise IOError('no directory found at path %s' % root)
+    meta_dict = {}
+    for dirpath, dirnames, filenames in os.walk(root):
+      for matching_filename in fnmatch.filter(filenames, pattern):
+        builder = os.path.basename(dirpath)
+        if BaseComparisons._ignore_builder(builder):
+          continue
+        fullpath = os.path.join(dirpath, matching_filename)
+        meta_dict[builder] = gm_json.LoadFromFile(fullpath)
+    return meta_dict
+
+  @staticmethod
+  def _create_relative_url(hashtype_and_digest, test_name):
+    """Returns the URL for this image, relative to GM_ACTUALS_ROOT_HTTP_URL.
+
+    If we don't have a record of this image, returns None.
+
+    Args:
+      hashtype_and_digest: (hash_type, hash_digest) tuple, or None if we
+          don't have a record of this image
+      test_name: string; name of the GM test that created this image
+    """
+    if not hashtype_and_digest:
+      return None
+    return gm_json.CreateGmRelativeUrl(
+        test_name=test_name,
+        hash_type=hashtype_and_digest[0],
+        hash_digest=hashtype_and_digest[1])