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1#!/usr/bin/env python2.7
2
3# Copyright 2016 gRPC authors.
4#
5# Licensed under the Apache License, Version 2.0 (the "License");
6# you may not use this file except in compliance with the License.
7# You may obtain a copy of the License at
8#
9#     http://www.apache.org/licenses/LICENSE-2.0
10#
11# Unless required by applicable law or agreed to in writing, software
12# distributed under the License is distributed on an "AS IS" BASIS,
13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14# See the License for the specific language governing permissions and
15# limitations under the License.
16
17import argparse
18import os
19import os.path
20import re
21import sys
22import subprocess
23
24
25def build_valid_guard(fpath):
26    prefix = 'GRPC_' if not fpath.startswith('include/') else ''
27    return prefix + '_'.join(
28        fpath.replace('++', 'XX').replace('.', '_').upper().split('/')[1:])
29
30
31def load(fpath):
32    with open(fpath, 'r') as f:
33        return f.read()
34
35
36def save(fpath, contents):
37    with open(fpath, 'w') as f:
38        f.write(contents)
39
40
41class GuardValidator(object):
42
43    def __init__(self):
44        self.ifndef_re = re.compile(r'#ifndef ([A-Z][A-Z_1-9]*)')
45        self.define_re = re.compile(r'#define ([A-Z][A-Z_1-9]*)')
46        self.endif_c_re = re.compile(
47            r'#endif /\* ([A-Z][A-Z_1-9]*) (?:\\ *\n *)?\*/')
48        self.endif_cpp_re = re.compile(r'#endif  // ([A-Z][A-Z_1-9]*)')
49        self.failed = False
50
51    def fail(self, fpath, regexp, fcontents, match_txt, correct, fix):
52        cpp_header = 'grpc++' in fpath or 'grpcpp' in fpath
53        self.failed = True
54        invalid_guards_msg_template = (
55            '{0}: Missing preprocessor guards (RE {1}). '
56            'Please wrap your code around the following guards:\n'
57            '#ifndef {2}\n'
58            '#define {2}\n'
59            '...\n'
60            '... epic code ...\n'
61            '...\n') + ('#endif  // {2}' if cpp_header else '#endif /* {2} */')
62        if not match_txt:
63            print invalid_guards_msg_template.format(fpath, regexp.pattern,
64                                                     build_valid_guard(fpath))
65            return fcontents
66
67        print('{}: Wrong preprocessor guards (RE {}):'
68              '\n\tFound {}, expected {}').format(fpath, regexp.pattern,
69                                                  match_txt, correct)
70        if fix:
71            print 'Fixing {}...\n'.format(fpath)
72            fixed_fcontents = re.sub(match_txt, correct, fcontents)
73            if fixed_fcontents:
74                self.failed = False
75            return fixed_fcontents
76        else:
77            print
78        return fcontents
79
80    def check(self, fpath, fix):
81        cpp_header = 'grpc++' in fpath or 'grpcpp' in fpath
82        valid_guard = build_valid_guard(fpath)
83
84        fcontents = load(fpath)
85
86        match = self.ifndef_re.search(fcontents)
87        if not match:
88            print 'something drastically wrong with: %s' % fpath
89            return False  # failed
90        if match.lastindex is None:
91            # No ifndef. Request manual addition with hints
92            self.fail(fpath, match.re, match.string, '', '', False)
93            return False  # failed
94
95        # Does the guard end with a '_H'?
96        running_guard = match.group(1)
97        if not running_guard.endswith('_H'):
98            fcontents = self.fail(fpath, match.re, match.string, match.group(1),
99                                  valid_guard, fix)
100            if fix: save(fpath, fcontents)
101
102        # Is it the expected one based on the file path?
103        if running_guard != valid_guard:
104            fcontents = self.fail(fpath, match.re, match.string, match.group(1),
105                                  valid_guard, fix)
106            if fix: save(fpath, fcontents)
107
108        # Is there a #define? Is it the same as the #ifndef one?
109        match = self.define_re.search(fcontents)
110        if match.lastindex is None:
111            # No define. Request manual addition with hints
112            self.fail(fpath, match.re, match.string, '', '', False)
113            return False  # failed
114
115        # Is the #define guard the same as the #ifndef guard?
116        if match.group(1) != running_guard:
117            fcontents = self.fail(fpath, match.re, match.string, match.group(1),
118                                  valid_guard, fix)
119            if fix: save(fpath, fcontents)
120
121        # Is there a properly commented #endif?
122        endif_re = self.endif_cpp_re if cpp_header else self.endif_c_re
123        flines = fcontents.rstrip().splitlines()
124        match = endif_re.search('\n'.join(flines[-2:]))
125        if not match:
126            # No endif. Check if we have the last line as just '#endif' and if so
127            # replace it with a properly commented one.
128            if flines[-1] == '#endif':
129                flines[-1] = (
130                    '#endif' +
131                    ('  // {}\n'.format(valid_guard)
132                     if cpp_header else ' /* {} */\n'.format(valid_guard)))
133                if fix:
134                    fcontents = '\n'.join(flines)
135                    save(fpath, fcontents)
136            else:
137                # something else is wrong, bail out
138                self.fail(fpath, endif_re, flines[-1], '', '', False)
139        elif match.group(1) != running_guard:
140            # Is the #endif guard the same as the #ifndef and #define guards?
141            fcontents = self.fail(fpath, endif_re, fcontents, match.group(1),
142                                  valid_guard, fix)
143            if fix: save(fpath, fcontents)
144
145        return not self.failed  # Did the check succeed? (ie, not failed)
146
147
148# find our home
149ROOT = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), '../..'))
150os.chdir(ROOT)
151
152# parse command line
153argp = argparse.ArgumentParser(description='include guard checker')
154argp.add_argument('-f', '--fix', default=False, action='store_true')
155argp.add_argument('--precommit', default=False, action='store_true')
156args = argp.parse_args()
157
158KNOWN_BAD = set([
159    'src/core/ext/filters/client_channel/lb_policy/grpclb/proto/grpc/lb/v1/load_balancer.pb.h',
160    'src/core/ext/filters/client_channel/lb_policy/grpclb/proto/grpc/lb/v1/google/protobuf/duration.pb.h',
161    'src/core/ext/filters/client_channel/lb_policy/grpclb/proto/grpc/lb/v1/google/protobuf/timestamp.pb.h',
162    'src/core/tsi/alts/handshaker/altscontext.pb.h',
163    'src/core/tsi/alts/handshaker/handshaker.pb.h',
164    'src/core/tsi/alts/handshaker/transport_security_common.pb.h',
165    'include/grpc++/ext/reflection.grpc.pb.h',
166    'include/grpc++/ext/reflection.pb.h',
167])
168
169grep_filter = r"grep -E '^(include|src/core)/.*\.h$'"
170if args.precommit:
171    git_command = 'git diff --name-only HEAD'
172else:
173    git_command = 'git ls-tree -r --name-only -r HEAD'
174
175FILE_LIST_COMMAND = ' | '.join((git_command, grep_filter))
176
177# scan files
178ok = True
179filename_list = []
180try:
181    filename_list = subprocess.check_output(
182        FILE_LIST_COMMAND, shell=True).splitlines()
183    # Filter out non-existent files (ie, file removed or renamed)
184    filename_list = (f for f in filename_list if os.path.isfile(f))
185except subprocess.CalledProcessError:
186    sys.exit(0)
187
188validator = GuardValidator()
189
190for filename in filename_list:
191    if filename in KNOWN_BAD: continue
192    ok = ok and validator.check(filename, args.fix)
193
194sys.exit(0 if ok else 1)
195