Karapace: Initial commit to get things started

Karapace is an aiohttp based daemon written in Python 3.6
that allows you initially to store and retrieve schemas.

Also schema compatibility testing support for the modes
BACKWARD, FULL and FORWARD compatibility exist, though
could surely be more comprehensive.

There's a fairly extensive set of unittests for the project
but there are sure to be issues that remain so we'll need
even more of them in the future.

The initial release is roughly ~2.5k LOC in all.

.flake8

@@ -0,0 +1,8 @@
+[flake8]
+max-line-length = 125
+
+# Style issues are handled by yapf formatting
+ignore =
+  E126,  # continuation line over-indented for hanging indent
+  W503,  # line break before binary operator
+  E251,  # unexpected spaces around keyword / parameter equals

.gitignore

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+*.pyc
+*.pyo
+*~
+/.cache
+/.coverage
+/.project
+/.pydevproject
+/.pytest_cache/
+__pycache__/
+/build/
+/dist/
+/karapace.egg-info/
+/karapace-rpm-src.tar
+/rpm/
+/kafka_*.tgz
+/kafka_*/

.pylintrc

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+[MASTER]
+jobs=4
+
+[MESSAGES CONTROL]
+disable=
+  bad-continuation,
+  fixme,
+  invalid-name,
+  missing-docstring,
+  too-few-public-methods,
+  too-many-arguments,
+  too-many-branches,
+  too-many-instance-attributes,
+  too-many-locals,
+  too-many-nested-blocks,
+  too-many-public-methods,
+  too-many-statements,
+  too-public-methods,
+  wrong-import-order,
+
+[FORMAT]
+max-line-length=125
+
+[REPORTS]
+output-format=text
+reports=no
+score=no

.style.yapf

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+[style]
+# For docs, see https://github.com/google/yapf/blob/master/README.rst
+
+based_on_style = pep8
+# Disallow splitting between dict key and dict value in multiline {"key": "value"} lines
+ALLOW_SPLIT_BEFORE_DICT_VALUE = false
+
+# Avoid adding unnecessary blank lines when nesting
+BLANK_LINE_BEFORE_NESTED_CLASS_OR_DEF = false
+
+# Always add two blank lines for top-level classes and methods
+BLANK_LINES_AROUND_TOP_LEVEL_DEFINITION = 2
+
+# These two combine consecutive ({ and }) to same line to reduce clutter
+COALESCE_BRACKETS = true
+DEDENT_CLOSING_BRACKETS = true
+
+# Line length
+COLUMN_LIMIT = 125
+
+# Try to avoid having overly long lines by having excessively large penalty for that.
+SPLIT_PENALTY_EXCESS_CHARACTER = 1000000000
+
+# Always split dict entries to one entry per line
+# EACH_DICT_ENTRY_ON_SEPARATE_LINE = true
+
+# Never split this comment to a separate line. Workaround for certain flake8 & email template lines
+I18N_COMMENT = # noqa
+
+# Allow automatically joining lines, for example, multiline if that would fit to a single line
+JOIN_MULTIPLE_LINES = true
+
+# "3 * 5", instead of "3*5"
+SPACES_AROUND_POWER_OPERATOR = true
+
+# Follow normal comment style by adding two spaces between code and comment
+SPACES_BEFORE_COMMENT = 2
+
+# If list of items is comma terminated, always split to one per line.
+SPLIT_ARGUMENTS_WHEN_COMMA_TERMINATED = true
+
+# Related to previous one, if list of items (args or dict/list/...) needs to be split, split to one per line.
+# SPLIT_ALL_COMMA_SEPARATED_VALUES = true
+
+# Split dict generators for clarity (add line breaks between { and key: val etc.
+SPLIT_BEFORE_DICT_SET_GENERATOR = true
+
+# Split method(k1=v1, k2=v2...) to separate lines
+SPLIT_BEFORE_NAMED_ASSIGNS = true
+
+# For complex (for some definition of complex) comprehensions, put output, for and if to separate lines
+SPLIT_COMPLEX_COMPREHENSION = true
+
+# When splitting something to multiple lines ('method(\n val...'), intend by 4
+CONTINUATION_INDENT_WIDTH = 4

.travis.yml

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+language: python
+
+python:
+  - "3.5"
+  - "3.6"
+
+# TODO: remove these overrides once default dist supports python 3.7
+matrix:
+  include:
+    - python: 3.7
+      dist: xenial
+      sudo: true
+
+install:
+  - "pip install astroid==2.0.0 flake8 pylint pytest isort yapf requests kafka-python aiohttp avro-python3 aiosocksy"
+
+script:
+  - "make pylint"
+  - "make flake8"
+  - "make unittest"