summaryrefslogtreecommitdiffstats
path: root/extras/scripts/crcchecker.py
blob: 01cb02523d04463d62aa1ccf684fc830ec1a9bf5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
#!/usr/bin/env python3

"""
crcchecker is a tool to used to enforce that .api messages do not change.
API files with a semantic version < 1.0.0 are ignored.
"""

import sys
import os
import json
import argparse
import re
from subprocess import run, PIPE, check_output, CalledProcessError

# pylint: disable=subprocess-run-check

ROOTDIR = os.path.dirname(os.path.realpath(__file__)) + "/../.."
APIGENBIN = f"{ROOTDIR}/src/tools/vppapigen/vppapigen.py"


def crc_from_apigen(revision, filename):
    """Runs vppapigen with crc plugin returning a JSON object with CRCs for
    all APIs in filename"""
    if not revision and not os.path.isfile(filename):
        print(f"skipping: {filename}", file=sys.stderr)
        # Return <class 'set'> instead of <class 'dict'>
        return {-1}

    if revision:
        apigen = (
            f"{APIGENBIN} --git-revision {revision} --includedir src "
            f"--input {filename} CRC"
        )
    else:
        apigen = f"{APIGENBIN} --includedir src --input {filename} CRC"
    returncode = run(apigen.split(), stdout=PIPE, stderr=PIPE)
    if returncode.returncode == 2:  # No such file
        print(f"skipping: {revision}:{filename} {returncode}", file=sys.stderr)
        return {}
    if returncode.returncode != 0:
        print(
            f"vppapigen failed for {revision}:{filename} with "
            "command\n {apigen}\n error: {rv}",
            returncode.stderr.decode("ascii"),
            file=sys.stderr,
        )
        sys.exit(-2)

    return json.loads(returncode.stdout)


def dict_compare(dict1, dict2):
    """Compare two dictionaries returning added, removed, modified
    and equal entries"""
    d1_keys = set(dict1.keys())
    d2_keys = set(dict2.keys())
    intersect_keys = d1_keys.intersection(d2_keys)
    added = d1_keys - d2_keys
    removed = d2_keys - d1_keys
    modified = {
        o: (dict1[o], dict2[o])
        for o in intersect_keys
        if dict1[o]["crc"] != dict2[o]["crc"]
    }
    same = set(o for o in intersect_keys if dict1[o] == dict2[o])
    return added, removed, modified, same


def filelist_from_git_ls():
    """Returns a list of all api files in the git repository"""
    filelist = []
    git_ls = "git ls-files *.api"
    returncode = run(git_ls.split(), stdout=PIPE, stderr=PIPE)
    if returncode.returncode != 0:
        sys.exit(returncode.returncode)

    for line in returncode.stdout.decode("ascii").split("\n"):
        if line:
            filelist.append(line)
    return filelist


def is_uncommitted_changes():
    """Returns true if there are uncommitted changes in the repo"""
    git_status = "git status --porcelain -uno"
    returncode = run(git_status.split(), stdout=PIPE, stderr=PIPE)
    if returncode.returncode != 0:
        sys.exit(returncode.returncode)

    if returncode.stdout:
        return True
    return False


def filelist_from_git_grep(filename):
    """Returns a list of api files that this <filename> api files imports."""
    filelist = []
    try:
        returncode = check_output(
            f'git grep -e "import .*{filename}"' " -- *.api", shell=True
        )
    except CalledProcessError:
        return []
    for line in returncode.decode("ascii").split("\n"):
        if line:
            filename, _ = line.split(":")
            filelist.append(filename)
    return filelist


def filelist_from_patchset(pattern):
    """Returns list of api files in changeset and the list of api
    files they import."""
    filelist = []
    git_cmd = (
        "((git diff HEAD~1.. --name-only;git ls-files -m) | "
        'sort -u | grep "\\.api$")'
    )
    try:
        res = check_output(git_cmd, shell=True)
    except CalledProcessError:
        return []

    # Check for dependencies (imports)
    imported_files = []
    for line in res.decode("ascii").split("\n"):
        if not line:
            continue
        if not re.search(pattern, line):
            continue
        filelist.append(line)
        imported_files.extend(filelist_from_git_grep(os.path.basename(line)))

    filelist.extend(imported_files)
    return set(filelist)


def is_deprecated(message):
    """Given a message, return True if message is deprecated"""
    if "options" in message:
        if "deprecated" in message["options"]:
            return True
        # recognize the deprecated format
        if (
            "status" in message["options"]
            and message["options"]["status"] == "deprecated"
        ):
            print("WARNING: please use 'option deprecated;'")
            return True
    return False


def is_in_progress(message):
    """Given a message, return True if message is marked as in_progress"""
    if "options" in message:
        if "in_progress" in message["options"]:
            return True
        # recognize the deprecated format
        if (
            "status" in message["options"]
            and message["options"]["status"] == "in_progress"
        ):
            print("WARNING: please use 'option in_progress;'")
            return True
    return False


def report(new, old):
    """Given a dictionary of new crcs and old crcs, print all the
    added, removed, modified, in-progress, deprecated messages.
    Return the number of backwards incompatible changes made."""

    # pylint: disable=too-many-branches

    new.pop("_version", None)
    old.pop("_version", None)
    added, removed, modified, _ = dict_compare(new, old)
    backwards_incompatible = 0

    # print the full list of in-progress messages
    # they should eventually either disappear of become supported
    for k in new.keys():
        newversion = int(new[k]["version"])
        if newversion == 0 or is_in_progress(new[k]):
            print(f"in-progress: {k}")
    for k in added:
        print(f"added: {k}")
    for k in removed:
        oldversion = int(old[k]["version"])
        if oldversion > 0 and not is_deprecated(old[k]) and not is_in_progress(old[k]):
            backwards_incompatible += 1
            print(f"removed: ** {k}")
        else:
            print(f"removed: {k}")
    for k in modified.keys():
        oldversion = int(old[k]["version"])
        newversion = int(new[k]["version"])
        if oldversion > 0 and not is_in_progress(old[k]):
            backwards_incompatible += 1
            print(f"modified: ** {k}")
        else:
            print(f"modified: {k}")

    # check which messages are still there but were marked for deprecation
    for k in new.keys():
        newversion = int(new[k]["version"])
        if newversion > 0 and is_deprecated(new[k]):
            if k in old:
                if not is_deprecated(old[k]):
                    print(f"deprecated: {k}")
            else:
                print(f"added+deprecated: {k}")

    return backwards_incompatible


def check_patchset():
    """Compare the changes to API messages in this changeset.
    Ignores API files with version < 1.0.0.
    Only considers API files located under the src directory in the repo.
    """
    files = filelist_from_patchset("^src/")
    revision = "HEAD~1"

    oldcrcs = {}
    newcrcs = {}
    for filename in files:
        # Ignore files that have version < 1.0.0
        _ = crc_from_apigen(None, filename)
        # Ignore removed files
        if isinstance(_, set) == 0:
            if isinstance(_, set) == 0 and _["_version"]["major"] == "0":
                continue
            newcrcs.update(_)

        oldcrcs.update(crc_from_apigen(revision, filename))

    backwards_incompatible = report(newcrcs, oldcrcs)
    if backwards_incompatible:
        # alert on changing production API
        print(
            "crcchecker: Changing production APIs in an incompatible way",
            file=sys.stderr,
        )
        sys.exit(-1)
    else:
        print("*" * 67)
        print("* VPP CHECKAPI SUCCESSFULLY COMPLETED")
        print("*" * 67)


def main():
    """Main entry point."""
    parser = argparse.ArgumentParser(description="VPP CRC checker.")
    parser.add_argument("--git-revision", help="Git revision to compare against")
    parser.add_argument(
        "--dump-manifest", action="store_true", help="Dump CRC for all messages"
    )
    parser.add_argument(
        "--check-patchset",
        action="store_true",
        help="Check patchset for backwards incompatbile changes",
    )
    parser.add_argument("files", nargs="*")
    parser.add_argument("--diff", help="Files to compare (on filesystem)", nargs=2)

    args = parser.parse_args()

    if args.diff and args.files:
        parser.print_help()
        sys.exit(-1)

    # Diff two files
    if args.diff:
        oldcrcs = crc_from_apigen(None, args.diff[0])
        newcrcs = crc_from_apigen(None, args.diff[1])
        backwards_incompatible = report(newcrcs, oldcrcs)
        sys.exit(0)

    # Dump CRC for messages in given files / revision
    if args.dump_manifest:
        files = args.files if args.files else filelist_from_git_ls()
        crcs = {}
        for filename in files:
            crcs.update(crc_from_apigen(args.git_revision, filename))
        for k, value in crcs.items():
            print(f"{k}: {value}")
        sys.exit(0)

    # Find changes between current patchset and given revision (previous)
    if args.check_patchset:
        if args.git_revision:
            print("Argument git-revision ignored", file=sys.stderr)
        # Check there are no uncomitted changes
        if is_uncommitted_changes():
            print("Please stash or commit changes in workspace", file=sys.stderr)
            sys.exit(-1)
        check_patchset()
        sys.exit(0)

    # Find changes between current workspace and revision
    # Find changes between a given file and a revision
    files = args.files if args.files else filelist_from_git_ls()

    revision = args.git_revision if args.git_revision else "HEAD~1"

    oldcrcs = {}
    newcrcs = {}
    for file in files:
        newcrcs.update(crc_from_apigen(None, file))
        oldcrcs.update(crc_from_apigen(revision, file))

    backwards_incompatible = report(newcrcs, oldcrcs)

    if args.check_patchset:
        if backwards_incompatible:
            # alert on changing production API
            print(
                "crcchecker: Changing production APIs in an incompatible way",
                file=sys.stderr,
            )
            sys.exit(-1)
        else:
            print("*" * 67)
            print("* VPP CHECKAPI SUCCESSFULLY COMPLETED")
            print("*" * 67)


if __name__ == "__main__":
    main()