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path: root/bitbake/lib/hashserv/__init__.py
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# Copyright (C) 2018-2019 Garmin Ltd.
#
# SPDX-License-Identifier: GPL-2.0-only
#

from http.server import BaseHTTPRequestHandler, HTTPServer
import contextlib
import urllib.parse
import sqlite3
import json
import traceback
import logging
import socketserver
import queue
import threading
import signal
import time
import math
import socket
import threading
from contextlib import contextmanager
from datetime import datetime

logger = logging.getLogger('hashserv')

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

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

    def end(self):
        self.stats.add(self.elapsed)

    def __enter__(self):
        self.start_time = time.perf_counter()
        return self

    def __exit__(self, *args, **kwargs):
        self.add(time.perf_counter() - self.start_time)

class Stats(object):
    def __init__(self):
        self.lock = threading.RLock()
        self.reset()

    def reset(self):
        with self.lock:
            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):
        with self.lock:
            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):
        with self.lock:
            if self.num == 0:
                return 0
            return self.total_time / self.num

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

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

request_stats = Stats()
io_stats = Stats()
sql_stats = Stats()
connect_stats = Stats()

class HashEquivalenceServer(BaseHTTPRequestHandler):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.equivalent_path = self.prefix + '/v1/equivalent'
        self.stats_path = self.prefix + '/v1/stats'

    def setup(self):
        global connect_stats
        global request_stats
        global io_stats
        global sql_stats

        if self.request.connect_time is not None:
            connect_stats.add(time.perf_counter() - self.request.connect_time)
            self.request.connect_time = None

        self.io_sample = io_stats.start_sample()
        self.sql_sample = sql_stats.start_sample()

        self.start_time = time.perf_counter()

        super().setup()

    def finish(self):
        global request_stats

        super().finish()
        request_stats.add(time.perf_counter() - self.start_time)

        self.io_sample.end()
        self.sql_sample.end()

    def handle_one_request(self):
        self.start_read_time = time.perf_counter()
        super().handle_one_request()

    def log_message(self, f, *args):
        logger.debug(f, *args)

    def opendb(self):
        self.db = sqlite3.connect(self.dbname)
        self.db.row_factory = sqlite3.Row
        self.db.execute("PRAGMA synchronous = OFF;")
        self.db.execute("PRAGMA journal_mode = MEMORY;")

    def do_GET_equivalent(self, p):
        query = urllib.parse.parse_qs(p.query, strict_parsing=True)
        method = query['method'][0]
        taskhash = query['taskhash'][0]

        d = None
        with contextlib.closing(self.db.cursor()) as cursor:
            with self.sql_sample:
                cursor.execute('SELECT taskhash, method, unihash FROM tasks_v2 WHERE method=:method AND taskhash=:taskhash ORDER BY created ASC LIMIT 1',
                        {'method': method, 'taskhash': taskhash})

                row = cursor.fetchone()

            if row is not None:
                logger.debug('Found equivalent task %s', row['taskhash'])
                d = {k: row[k] for k in ('taskhash', 'method', 'unihash')}

        return d

    def do_GET_stats(self, p):
        global request_stats
        global connect_stats
        global io_stats

        return {
            'requests': request_stats.todict(),
            'connections': connect_stats.todict(),
            'io': io_stats.todict(),
            'sql': sql_stats.todict(),
            }

    def do_DELETE_stats(self, p):
        global request_stats
        global connect_stats

        request_stats.reset()
        connect_stats.reset()

        self.send_response(200)
        self.end_headers()

    def do_GET(self):
        self.io_sample.add(time.perf_counter() - self.start_read_time)

        try:
            if not self.db:
                self.opendb()

            p = urllib.parse.urlparse(self.path)

            if p.path == self.prefix + '/v1/equivalent':
                d = self.do_GET_equivalent(p)
            elif p.path == self.prefix + '/v1/stats':
                d = self.do_GET_stats(p)
            else:
                with self.io_sample:
                    self.send_error(404)
                return

            data = json.dumps(d).encode('utf-8')

            with self.io_sample:
                self.send_response(200)
                self.send_header('Content-Type', 'application/json; charset=utf-8')
                self.send_header('Content-length', str(len(data)))
                self.end_headers()
                self.wfile.write(data)
                self.wfile.flush()
        except:
            logger.exception('Error in GET')
            with self.io_sample:
                self.send_error(400, explain=traceback.format_exc())

    def do_POST(self):
        self.io_sample.add(time.perf_counter() - self.start_read_time)

        try:
            if not self.db:
                self.opendb()

            p = urllib.parse.urlparse(self.path)

            if p.path != self.prefix + '/v1/equivalent':
                with self.io_sample:
                    self.send_error(404)
                return

            length = int(self.headers['content-length'])
            with self.io_sample:
                data = json.loads(self.rfile.read(length).decode('utf-8'))

            with contextlib.closing(self.db.cursor()) as cursor:
                with self.sql_sample:
                    cursor.execute('''
                        -- Find tasks with a matching outhash (that is, tasks that
                        -- are equivalent)
                        SELECT taskhash, method, unihash 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
                        ''', {k: data[k] for k in ('method', 'outhash', 'taskhash')})

                    row = cursor.fetchone()

                # 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]

                    with self.sql_sample:
                        cursor.execute('''INSERT INTO tasks_v2 (%s) VALUES (%s)''' % (
                                ', '.join(sorted(insert_data.keys())),
                                ', '.join(':' + k for k in sorted(insert_data.keys()))),
                            insert_data)

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

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

                with self.io_sample:
                    self.send_response(200)
                    self.send_header('Content-Type', 'application/json; charset=utf-8')
                    self.end_headers()
                    self.wfile.write(json.dumps(d).encode('utf-8'))
                    self.wfile.flush()
        except:
            logger.exception('Error in POST')
            with self.io_sample:
                self.send_error(400, explain=traceback.format_exc())

    def do_DELETE(self):
        try:
            p = urllib.parse.urlparse(self.path)

            if p.path == self.prefix + '/v1/stats':
                self.do_DELETE_stats(p)
            else:
                with self.io_sample:
                    self.send_error(404)
                return
        except:
            logger.exception('Error in DELETE')
            with self.io_sample:
                self.send_error(400, explain=traceback.format_exc())

class ClientSocket(socket.socket):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.connect_time = time.perf_counter()

    @classmethod
    def create(cls, sock):
        import _socket
        fd = _socket.dup(sock.fileno())
        s = cls(sock.family, sock.type, sock.proto, fileno=fd)
        s.settimeout(sock.gettimeout())
        return s

class ThreadedHTTPServer(HTTPServer):
    # The quit event needs to be a distinct object. Making a plain object() and
    # checking it with "is" works well
    quit = object()

    def __init__(self, *args, num_threads=1, **kwargs):
        super().__init__(*args, **kwargs)
        self.num_threads = num_threads

    def serve_forever(self):
        logger.debug('Using %d threads' % self.num_threads)
        self.requestqueue = queue.Queue()
        self.handlerthreads = [threading.Thread(target=self.process_request_thread) for i in range(self.num_threads)]

        for t in self.handlerthreads:
            t.daemon = False
            t.start()

        signal.signal(signal.SIGTERM, self.sigterm_exception)
        super().serve_forever()
        os._exit(0)

    def sigterm_exception(self, signum, stackframe):
        self.server_close()
        os._exit(0)

    def process_request_thread(self):
        while True:
            try:
                d = self.requestqueue.get(True)
                if d is self.quit:
                    # Put the item back in the queue for another thread to get
                    self.requestqueue.put(d)
                    break

                (request, client_address) = d
            except queue.Empty:
                continue

            try:
                self.finish_request(request, client_address)
            except Exception:
                self.handle_error(request, client_address)
            finally:
                self.shutdown_request(request)
        os._exit(0)

    def process_request(self, request, client_address):
        self.requestqueue.put((request, client_address))

    def server_close(self):
        super().server_close()

        self.requestqueue.put(self.quit)
        for t in self.handlerthreads:
            t.join()

    def get_request(self):
        sock, client_address = super().get_request()
        return ClientSocket.create(sock), client_address

def create_server(addr, dbname, prefix='', num_threads=1):
    class Handler(HashEquivalenceServer):
        pass

    db = sqlite3.connect(dbname)
    db.row_factory = sqlite3.Row

    Handler.prefix = prefix
    Handler.db = None
    Handler.dbname = dbname

    with contextlib.closing(db.cursor()) as cursor:
        cursor.execute('''
            CREATE TABLE IF NOT EXISTS tasks_v2 (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                method TEXT NOT NULL,
                outhash TEXT NOT NULL,
                taskhash TEXT NOT NULL,
                unihash TEXT NOT NULL,
                created DATETIME,

                -- Optional fields
                owner TEXT,
                PN TEXT,
                PV TEXT,
                PR TEXT,
                task TEXT,
                outhash_siginfo TEXT,

                UNIQUE(method, outhash, taskhash)
                )
            ''')
        cursor.execute('CREATE INDEX IF NOT EXISTS taskhash_lookup ON tasks_v2 (method, taskhash)')
        cursor.execute('CREATE INDEX IF NOT EXISTS outhash_lookup ON tasks_v2 (method, outhash)')

    ret = ThreadedHTTPServer(addr, Handler, num_threads=num_threads)

    logger.info('Starting server on %s\n', ret.server_port)

    return ret