summaryrefslogtreecommitdiff
path: root/poky/bitbake/lib/hashserv/server.py
blob: 8e849897371606d840fbea4c175a49748633c044 (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
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
# Copyright (C) 2019 Garmin Ltd.
#
# SPDX-License-Identifier: GPL-2.0-only
#

from contextlib import closing, contextmanager
from datetime import datetime
import asyncio
import logging
import math
import time
from . import create_async_client, TABLE_COLUMNS
import bb.asyncrpc


logger = logging.getLogger('hashserv.server')


class Measurement(object):
    def __init__(self, sample):
        self.sample = sample

    def start(self):
        self.start_time = time.perf_counter()

    def end(self):
        self.sample.add(time.perf_counter() - self.start_time)

    def __enter__(self):
        self.start()
        return self

    def __exit__(self, *args, **kwargs):
        self.end()


class Sample(object):
    def __init__(self, stats):
        self.stats = stats
        self.num_samples = 0
        self.elapsed = 0

    def measure(self):
        return Measurement(self)

    def __enter__(self):
        return self

    def __exit__(self, *args, **kwargs):
        self.end()

    def add(self, elapsed):
        self.num_samples += 1
        self.elapsed += elapsed

    def end(self):
        if self.num_samples:
            self.stats.add(self.elapsed)
            self.num_samples = 0
            self.elapsed = 0


class Stats(object):
    def __init__(self):
        self.reset()

    def reset(self):
        self.num = 0
        self.total_time = 0
        self.max_time = 0
        self.m = 0
        self.s = 0
        self.current_elapsed = None

    def add(self, elapsed):
        self.num += 1
        if self.num == 1:
            self.m = elapsed
            self.s = 0
        else:
            last_m = self.m
            self.m = last_m + (elapsed - last_m) / self.num
            self.s = self.s + (elapsed - last_m) * (elapsed - self.m)

        self.total_time += elapsed

        if self.max_time < elapsed:
            self.max_time = elapsed

    def start_sample(self):
        return Sample(self)

    @property
    def average(self):
        if self.num == 0:
            return 0
        return self.total_time / self.num

    @property
    def stdev(self):
        if self.num <= 1:
            return 0
        return math.sqrt(self.s / (self.num - 1))

    def todict(self):
        return {k: getattr(self, k) for k in ('num', 'total_time', 'max_time', 'average', 'stdev')}


def insert_task(cursor, data, ignore=False):
    keys = sorted(data.keys())
    query = '''INSERT%s INTO tasks_v2 (%s) VALUES (%s)''' % (
        " OR IGNORE" if ignore else "",
        ', '.join(keys),
        ', '.join(':' + k for k in keys))
    cursor.execute(query, data)

async def copy_from_upstream(client, db, method, taskhash):
    d = await client.get_taskhash(method, taskhash, True)
    if d is not None:
        # Filter out unknown columns
        d = {k: v for k, v in d.items() if k in TABLE_COLUMNS}

        with closing(db.cursor()) as cursor:
            insert_task(cursor, d)
            db.commit()

    return d

async def copy_outhash_from_upstream(client, db, method, outhash, taskhash):
    d = await client.get_outhash(method, outhash, taskhash)
    if d is not None:
        # Filter out unknown columns
        d = {k: v for k, v in d.items() if k in TABLE_COLUMNS}

        with closing(db.cursor()) as cursor:
            insert_task(cursor, d)
            db.commit()

    return d

class ServerClient(bb.asyncrpc.AsyncServerConnection):
    FAST_QUERY = 'SELECT taskhash, method, unihash FROM tasks_v2 WHERE method=:method AND taskhash=:taskhash ORDER BY created ASC LIMIT 1'
    ALL_QUERY =  'SELECT *                         FROM tasks_v2 WHERE method=:method AND taskhash=:taskhash ORDER BY created ASC LIMIT 1'
    OUTHASH_QUERY = '''
        -- Find tasks with a matching outhash (that is, tasks that
        -- are equivalent)
        SELECT * FROM tasks_v2 WHERE method=:method AND outhash=:outhash

        -- If there is an exact match on the taskhash, return it.
        -- Otherwise return the oldest matching outhash of any
        -- taskhash
        ORDER BY CASE WHEN taskhash=:taskhash THEN 1 ELSE 2 END,
            created ASC

        -- Only return one row
        LIMIT 1
        '''

    def __init__(self, reader, writer, db, request_stats, backfill_queue, upstream, read_only):
        super().__init__(reader, writer, 'OEHASHEQUIV', logger)
        self.db = db
        self.request_stats = request_stats
        self.max_chunk = bb.asyncrpc.DEFAULT_MAX_CHUNK
        self.backfill_queue = backfill_queue
        self.upstream = upstream

        self.handlers.update({
            'get': self.handle_get,
            'get-outhash': self.handle_get_outhash,
            'get-stream': self.handle_get_stream,
            'get-stats': self.handle_get_stats,
        })

        if not read_only:
            self.handlers.update({
                'report': self.handle_report,
                'report-equiv': self.handle_equivreport,
                'reset-stats': self.handle_reset_stats,
                'backfill-wait': self.handle_backfill_wait,
            })

    def validate_proto_version(self):
        return (self.proto_version > (1, 0) and self.proto_version <= (1, 1))

    async def process_requests(self):
        if self.upstream is not None:
            self.upstream_client = await create_async_client(self.upstream)
        else:
            self.upstream_client = None

        await super().process_requests()

        if self.upstream_client is not None:
            await self.upstream_client.close()

    async def dispatch_message(self, msg):
        for k in self.handlers.keys():
            if k in msg:
                logger.debug('Handling %s' % k)
                if 'stream' in k:
                    await self.handlers[k](msg[k])
                else:
                    with self.request_stats.start_sample() as self.request_sample, \
                            self.request_sample.measure():
                        await self.handlers[k](msg[k])
                return

        raise bb.asyncrpc.ClientError("Unrecognized command %r" % msg)

    async def handle_get(self, request):
        method = request['method']
        taskhash = request['taskhash']

        if request.get('all', False):
            row = self.query_equivalent(method, taskhash, self.ALL_QUERY)
        else:
            row = self.query_equivalent(method, taskhash, self.FAST_QUERY)

        if row is not None:
            logger.debug('Found equivalent task %s -> %s', (row['taskhash'], row['unihash']))
            d = {k: row[k] for k in row.keys()}
        elif self.upstream_client is not None:
            d = await copy_from_upstream(self.upstream_client, self.db, method, taskhash)
        else:
            d = None

        self.write_message(d)

    async def handle_get_outhash(self, request):
        with closing(self.db.cursor()) as cursor:
            cursor.execute(self.OUTHASH_QUERY,
                           {k: request[k] for k in ('method', 'outhash', 'taskhash')})

            row = cursor.fetchone()

        if row is not None:
            logger.debug('Found equivalent outhash %s -> %s', (row['outhash'], row['unihash']))
            d = {k: row[k] for k in row.keys()}
        else:
            d = None

        self.write_message(d)

    async def handle_get_stream(self, request):
        self.write_message('ok')

        while True:
            upstream = None

            l = await self.reader.readline()
            if not l:
                return

            try:
                # This inner loop is very sensitive and must be as fast as
                # possible (which is why the request sample is handled manually
                # instead of using 'with', and also why logging statements are
                # commented out.
                self.request_sample = self.request_stats.start_sample()
                request_measure = self.request_sample.measure()
                request_measure.start()

                l = l.decode('utf-8').rstrip()
                if l == 'END':
                    self.writer.write('ok\n'.encode('utf-8'))
                    return

                (method, taskhash) = l.split()
                #logger.debug('Looking up %s %s' % (method, taskhash))
                row = self.query_equivalent(method, taskhash, self.FAST_QUERY)
                if row is not None:
                    msg = ('%s\n' % row['unihash']).encode('utf-8')
                    #logger.debug('Found equivalent task %s -> %s', (row['taskhash'], row['unihash']))
                elif self.upstream_client is not None:
                    upstream = await self.upstream_client.get_unihash(method, taskhash)
                    if upstream:
                        msg = ("%s\n" % upstream).encode("utf-8")
                    else:
                        msg = "\n".encode("utf-8")
                else:
                    msg = '\n'.encode('utf-8')

                self.writer.write(msg)
            finally:
                request_measure.end()
                self.request_sample.end()

            await self.writer.drain()

            # Post to the backfill queue after writing the result to minimize
            # the turn around time on a request
            if upstream is not None:
                await self.backfill_queue.put((method, taskhash))

    async def handle_report(self, data):
        with closing(self.db.cursor()) as cursor:
            cursor.execute(self.OUTHASH_QUERY,
                           {k: data[k] for k in ('method', 'outhash', 'taskhash')})

            row = cursor.fetchone()

            if row is None and self.upstream_client:
                # Try upstream
                row = await copy_outhash_from_upstream(self.upstream_client,
                                                       self.db,
                                                       data['method'],
                                                       data['outhash'],
                                                       data['taskhash'])

            # If no matching outhash was found, or one *was* found but it
            # wasn't an exact match on the taskhash, a new entry for this
            # taskhash should be added
            if row is None or row['taskhash'] != data['taskhash']:
                # If a row matching the outhash was found, the unihash for
                # the new taskhash should be the same as that one.
                # Otherwise the caller provided unihash is used.
                unihash = data['unihash']
                if row is not None:
                    unihash = row['unihash']

                insert_data = {
                    'method': data['method'],
                    'outhash': data['outhash'],
                    'taskhash': data['taskhash'],
                    'unihash': unihash,
                    'created': datetime.now()
                }

                for k in ('owner', 'PN', 'PV', 'PR', 'task', 'outhash_siginfo'):
                    if k in data:
                        insert_data[k] = data[k]

                insert_task(cursor, insert_data)
                self.db.commit()

                logger.info('Adding taskhash %s with unihash %s',
                            data['taskhash'], unihash)

                d = {
                    'taskhash': data['taskhash'],
                    'method': data['method'],
                    'unihash': unihash
                }
            else:
                d = {k: row[k] for k in ('taskhash', 'method', 'unihash')}

        self.write_message(d)

    async def handle_equivreport(self, data):
        with closing(self.db.cursor()) as cursor:
            insert_data = {
                'method': data['method'],
                'outhash': "",
                'taskhash': data['taskhash'],
                'unihash': data['unihash'],
                'created': datetime.now()
            }

            for k in ('owner', 'PN', 'PV', 'PR', 'task', 'outhash_siginfo'):
                if k in data:
                    insert_data[k] = data[k]

            insert_task(cursor, insert_data, ignore=True)
            self.db.commit()

            # Fetch the unihash that will be reported for the taskhash. If the
            # unihash matches, it means this row was inserted (or the mapping
            # was already valid)
            row = self.query_equivalent(data['method'], data['taskhash'], self.FAST_QUERY)

            if row['unihash'] == data['unihash']:
                logger.info('Adding taskhash equivalence for %s with unihash %s',
                                data['taskhash'], row['unihash'])

            d = {k: row[k] for k in ('taskhash', 'method', 'unihash')}

        self.write_message(d)


    async def handle_get_stats(self, request):
        d = {
            'requests': self.request_stats.todict(),
        }

        self.write_message(d)

    async def handle_reset_stats(self, request):
        d = {
            'requests': self.request_stats.todict(),
        }

        self.request_stats.reset()
        self.write_message(d)

    async def handle_backfill_wait(self, request):
        d = {
            'tasks': self.backfill_queue.qsize(),
        }
        await self.backfill_queue.join()
        self.write_message(d)

    def query_equivalent(self, method, taskhash, query):
        # This is part of the inner loop and must be as fast as possible
        try:
            cursor = self.db.cursor()
            cursor.execute(query, {'method': method, 'taskhash': taskhash})
            return cursor.fetchone()
        except:
            cursor.close()


class Server(bb.asyncrpc.AsyncServer):
    def __init__(self, db, loop=None, upstream=None, read_only=False):
        if upstream and read_only:
            raise bb.asyncrpc.ServerError("Read-only hashserv cannot pull from an upstream server")

        super().__init__(logger, loop)

        self.request_stats = Stats()
        self.db = db
        self.upstream = upstream
        self.read_only = read_only

    def accept_client(self, reader, writer):
        return ServerClient(reader, writer, self.db, self.request_stats, self.backfill_queue, self.upstream, self.read_only)

    @contextmanager
    def _backfill_worker(self):
        async def backfill_worker_task():
            client = await create_async_client(self.upstream)
            try:
                while True:
                    item = await self.backfill_queue.get()
                    if item is None:
                        self.backfill_queue.task_done()
                        break
                    method, taskhash = item
                    await copy_from_upstream(client, self.db, method, taskhash)
                    self.backfill_queue.task_done()
            finally:
                await client.close()

        async def join_worker(worker):
            await self.backfill_queue.put(None)
            await worker

        if self.upstream is not None:
            worker = asyncio.ensure_future(backfill_worker_task())
            try:
                yield
            finally:
                self.loop.run_until_complete(join_worker(worker))
        else:
            yield

    def run_loop_forever(self):
        self.backfill_queue = asyncio.Queue()

        with self._backfill_worker():
            super().run_loop_forever()