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ottertune/script/validators/source_validator.py

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#!/usr/bin/env python
# encoding: utf-8
#
# OtterTune - source_validator.py
#
# Copyright (c) 2017-18, Carnegie Mellon University Database Group
#
# ==============================================
# SOURCE VALIDATOR
# ==============================================
#
# Adapted from the source validator used by Peloton.
# (see https://github.com/cmu-db/peloton/blob/master/script/validators/source_validator.py)
import argparse
import logging
import imp
import os
import re
import subprocess
import sys
import json
import functools
from collections import namedtuple
from fabric.api import lcd, local, settings, quiet
EXIT_SUCCESS = 0
EXIT_FAILURE = -1
# ==============================================
# CONFIGURATION
# ==============================================
# Logging
LOG = logging.getLogger(__name__)
LOG.addHandler(logging.StreamHandler())
LOG.setLevel(logging.INFO)
# NOTE: the absolute path to ottertune directory is calculated from current
# directory structure: ottertune/server/website/scripts/validators/<this_file>
# OTTERTUNE_DIR needs to be redefined if the directory structure is changed.
CODE_SOURCE_DIR = os.path.abspath(os.path.dirname(__file__))
OTTERTUNE_DIR = os.path.abspath(functools.reduce(os.path.join,
[CODE_SOURCE_DIR,
os.path.pardir,
os.path.pardir]))
# Other directory paths used are relative to OTTERTUNE_DIR
DEFAULT_DIRS = [
OTTERTUNE_DIR
]
# Directories that should NOT be checked
EXCLUDE_DIRECTORIES = [
# Django-generated directories
os.path.join(OTTERTUNE_DIR, "server/website/website/migrations"),
# Source code files from json.org
os.path.join(OTTERTUNE_DIR, "client/controller/src/main/java/com/controller/util/json"),
# Django settings
os.path.join(OTTERTUNE_DIR, 'server/website/website/settings'),
# Docker files
os.path.join(OTTERTUNE_DIR, 'docker'),
# Django manage.py extensions
os.path.join(OTTERTUNE_DIR, "server/website/website/management"),
]
# Files that should NOT be checked
EXCLUDE_FILES = [
# Django-generated files
os.path.join(OTTERTUNE_DIR, 'server/website/manage.py'),
# Docker files
os.path.join(OTTERTUNE_DIR, 'server/website/createadmin.py'),
]
CHECKSTYLE_JAR_PATH = os.path.join(OTTERTUNE_DIR,
"client/controller/build/libs/checkstyle-8.8-all.jar")
# Regex patterns
PYCODESTYLE_COMMENT_PATTERN = re.compile(r'#\s*pycodestyle:\s*disable\s*=\s*[\w\,\s]+$')
PYTHON_ILLEGAL_PATTERNS = [
(re.compile(r'^print[ (]'), "Do not use 'print'. Use the logging module instead.")
]
JAVA_ILLEGAL_PATTERNS = [
(re.compile(r'^System.out.println'), "Do not use println. Use the logging module instead.")
]
PYTHON_HEADER_PATTERN = re.compile(r'#\n#.*\n#\n# Copyright.*\n#\n')
JAVA_HEADER_PATTERN = re.compile(r'/\*\n \*.*\n \*\n \* Copyright.*\n \*/\n\n')
# Stdout format strings
SEPARATOR = 80 * '-'
OUTPUT_FMT = (
'' + SEPARATOR + '\n\n'
'\033[1m' # start bold text
'%s\n'
'FAILED: %s\n\n'
'\033[0m' # end bold text
'%s'
)
VALIDATOR_FMT = '{name}\n{u}\n{out}'.format
MSG_PREFIX_FMT = ' {filename}:{line:3d}: '.format
MSG_SUFFIX_FMT = ' ({symbol})'.format
# ==============================================
# UTILITY FUNCTION DEFINITIONS
# ==============================================
def format_message(filename, line, message, symbol=None):
out_prefix = MSG_PREFIX_FMT(filename=filename, line=line)
out_suffix = '' if symbol is None else MSG_SUFFIX_FMT(symbol=symbol)
# Crop the message details to make the output more readable
max_msg_len = 80 - len(out_prefix) - len(out_suffix)
if len(message) > max_msg_len:
message = message[:max_msg_len - 3] + '...'
output = (out_prefix + message + out_suffix).replace('\n', '')
return output + '\n'
def validate_validator(modules, config_path):
status = True
# Check if required modules are installed
for module in modules:
if module is not None:
try:
imp.find_module(module)
except ImportError:
LOG.error("Cannot find module %s", module)
status = False
# Check that the config file exists if assigned
if config_path is not None and not os.path.isfile(config_path):
LOG.error("Cannot find config file %s", config_path)
status = False
return status
# Validate the file passed as argument
def validate_file(file_path):
if file_path in EXCLUDE_FILES:
return True
if not file_path.endswith(".py") and not file_path.endswith(".java"):
return True
LOG.debug("Validating file: %s", file_path)
status = True
output = []
failed_validators = []
for validator in VALIDATORS:
val_status, val_output = validator.validate_fn(
file_path, validator.config_path)
if not val_status:
status = False
output.append(VALIDATOR_FMT(name=validator.name,
u='-' * len(validator.name),
out=val_output))
failed_validators.append(validator.name)
if not status:
LOG.info(OUTPUT_FMT, file_path, ', '.join(failed_validators), '\n'.join(output))
return status
# Validate all the files in the root_dir passed as argument
def validate_dir(root_dir):
if root_dir in EXCLUDE_DIRECTORIES:
return True
status = True
for root, dirs, files in os.walk(root_dir): # pylint: disable=not-an-iterable
# Remove excluded dirs from list
dirs[:] = [d for d in dirs if os.path.join(root, d) not in EXCLUDE_DIRECTORIES]
for file_path in files:
file_path = os.path.join(root, file_path)
if not validate_file(file_path):
status = False
return status
# ==============================================
# VALIDATOR FUNCTION DEFINITIONS
# ==============================================
def check_pylint(file_path, config_path=None):
if not file_path.endswith(".py"):
return True, None
options = [
'--output-format=json',
'--reports=yes',
]
if config_path is not None:
options.append('--rcfile=' + config_path)
with settings(warn_only=True), quiet():
res = local('pylint {} {}'.format(' '.join(options), file_path), capture=True)
if res.stdout == '':
assert res.return_code == 0, 'return_code={}, expected=0\n{}'.format(
res.return_code, res.stderr)
return True, None
output = []
errors = json.loads(res.stdout)
for entry in errors:
# Remove extra whitespace and hints
msg = entry['message'].replace('^', '').replace('|', '')
msg = re.sub(' +', ' ', msg)
msg = msg.strip()
output.append(format_message(os.path.basename(file_path), entry['line'],
msg, entry['symbol']))
output = ''.join(output)
return res.return_code == 0, output
def check_pycodestyle(file_path, config_path=None):
import pycodestyle
if not file_path.endswith(".py"):
return True, None
# A custom reporter class for pycodestyle that checks for disabled errors
# and formats the style report output.
class CustomReporter(pycodestyle.StandardReport):
def get_file_results(self):
# Iterates through the lines of code that generated lint errors and
# checks if the given error has been disabled for that line via an
# inline comment (e.g., # pycodestyle: disable=E201,E226). Those
# that have been disabled are not treated as errors.
self._deferred_print.sort()
results = []
prev_line_num = -1
prev_line_errs = []
for line_number, _, code, text, _ in self._deferred_print:
if prev_line_num == line_number:
err_codes = prev_line_errs
else:
line = self.lines[line_number - 1]
m = PYCODESTYLE_COMMENT_PATTERN.search(line)
if m and m.group(0):
err_codes = [ec.strip() for ec in m.group(0).split('=')[1].split(',')]
else:
err_codes = []
prev_line_num = line_number
prev_line_errs = err_codes
if code in err_codes:
# Error is disabled in source
continue
results.append(format_message(os.path.basename(file_path),
self.line_offset + line_number,
text, code))
return results, len(results) == 0
# END CustomReporter class
options = {} if config_path is None else {'config_file': config_path}
style = pycodestyle.StyleGuide(quiet=True, **options)
# Set the reporter option to our custom one
style.options.reporter = CustomReporter
style.init_report()
report = style.check_files([file_path])
results, status = report.get_file_results()
output = None if status else ''.join(results)
return status, output
def check_java_checkstyle(file_path, config_path=None):
if not file_path.endswith(".java"):
return True, None
if not os.path.exists(CHECKSTYLE_JAR_PATH):
with lcd(os.path.join(OTTERTUNE_DIR, "client/controller")): # pylint: disable=not-context-manager
local("gradle downloadJars")
options = '' if config_path is None else '-c ' + config_path
with quiet():
res = local("java -jar {} {} {}".format(CHECKSTYLE_JAR_PATH, options, file_path),
capture=True)
lines = res.stdout.split('\n')
assert len(lines) >= 2 and lines[0] == "Starting audit..." and lines[-1] == "Audit done."
if len(lines) == 2:
return True, None
output = []
for line in lines[1:-1]:
parts = line.strip().split(':')
line_number = int(parts[1])
text, code = parts[-1].rsplit('[', 1)
text = text.strip()
code = code[:-1]
output.append(format_message(os.path.basename(file_path), line_number, text, code))
output = ''.join(output)
return False, output
def check_illegal_patterns(file_path, config_path=None): # pylint: disable=unused-argument
if file_path.endswith(".py"):
illegal_patterns = PYTHON_ILLEGAL_PATTERNS
comment = "#"
elif file_path.endswith(".java"):
illegal_patterns = JAVA_ILLEGAL_PATTERNS
comment = "//"
else:
return True, None
line_num = 1
output = []
status = True
with open(file_path, 'r') as f:
for line in f:
line = line.strip()
for pattern_info in illegal_patterns:
if not line.startswith(comment) and pattern_info[0].search(line):
output.append(format_message(filename=os.path.basename(file_path),
line=line_num,
message=pattern_info[1]))
status = False
line_num += 1
output = None if status else ''.join(output)
return status, output
def check_header(file_path, config_file=None): # pylint: disable=unused-argument
if file_path.endswith(".py"):
header_pattern = PYTHON_HEADER_PATTERN
elif file_path.endswith(".java"):
header_pattern = JAVA_HEADER_PATTERN
else:
return True, None
status = True
output = None
with open(file_path, 'r') as f:
file_contents = f.read()
header_match = header_pattern.search(file_contents)
filename = os.path.basename(file_path)
if header_match:
if filename not in header_match.group(0):
status = False
output = format_message(filename=filename, line=2,
message="Incorrect filename in header")
else:
status = False
output = format_message(filename=filename, line=1,
message='Missing header')
return status, output
# ==============================================
# VALIDATORS
# ==============================================
# Struct for storing validator metadata
Validator = namedtuple('Validator', 'name validate_fn modules config_path')
VALIDATORS = [
# Runs pylint on python source
Validator('check_pylint', check_pylint, ['pylint'],
os.path.join(OTTERTUNE_DIR, "script/formatting/config/pylintrc")),
# Runs pycodestyle on python source
Validator('check_pycodestyle', check_pycodestyle, ['pycodestyle'],
os.path.join(OTTERTUNE_DIR, "script/formatting/config/pycodestyle")),
# Runs checkstyle on the java source
Validator("check_java_checkstyle", check_java_checkstyle, [],
os.path.join(OTTERTUNE_DIR, "script/formatting/config/google_checks.xml")),
# Checks that the python/java source files do not use illegal patterns
Validator('check_illegal_patterns', check_illegal_patterns, [], None),
# Checks that the python/java source files have headers
Validator('check_header', check_header, [], None)
]
# ==============================================
# MAIN FUNCTION
# ==============================================
def main():
parser = argparse.ArgumentParser(description="Validate OtterTune's source code")
parser.add_argument('paths', metavar='PATH', type=str, nargs='*',
help='Files or directories to (recursively) validate')
parser.add_argument('--staged-files', action='store_true',
help='Apply the selected action(s) to all staged files (git)')
args = parser.parse_args()
LOG.info('\nRunning source validators:\n%s\n',
'\n'.join(' ' + v.name for v in VALIDATORS))
for validator in VALIDATORS:
if not validate_validator(validator.modules, validator.config_path):
sys.exit(EXIT_FAILURE)
if args.staged_files:
targets = [os.path.abspath(os.path.join(OTTERTUNE_DIR, f))
for f in subprocess.check_output(["git", "diff", "--name-only", "HEAD",
"--cached", "--diff-filter=d"]).split()]
if not targets:
LOG.error("No staged files or not calling from a repository. Exiting...")
sys.exit(EXIT_FAILURE)
elif args.paths:
targets = args.paths
else:
targets = DEFAULT_DIRS
for target in targets:
target = os.path.abspath(target)
if os.path.isfile(target):
LOG.debug("Scanning file: %s\n", target)
status = validate_file(target)
elif os.path.isdir(target):
LOG.debug("Scanning directory: %s\n", target)
status = validate_dir(target)
else:
LOG.error("%s isn't a file or directory", target)
sys.exit(EXIT_FAILURE)
if not status:
LOG.info(SEPARATOR + '\n')
LOG.info("Validation NOT successful\n")
sys.exit(EXIT_FAILURE)
LOG.info("Validation successful\n")
sys.exit(EXIT_SUCCESS)
if __name__ == '__main__':
main()
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