2 Implementation of the 'replication' sub-command.
9 from nominatim.db import status
10 from nominatim.db.connection import connect
11 from nominatim.errors import UsageError
13 LOG = logging.getLogger()
15 # Do not repeat documentation of subcommand classes.
16 # pylint: disable=C0111
17 # Using non-top-level imports to make pyosmium optional for replication only.
18 # pylint: disable=E0012,C0415
20 class UpdateReplication:
22 Update the database using an online replication service.
24 An OSM replication service is an online service that provides regular
25 updates (OSM diff files) for the planet or update they provide. The OSMF
26 provides the primary replication service for the full planet at
27 https://planet.osm.org/replication/ but there are other providers of
28 extracts of OSM data who provide such a service as well.
30 This sub-command allows to set up such a replication service and download
31 and import updates at regular intervals. You need to call '--init' once to
32 set up the process or whenever you change the replication configuration
33 parameters. Without any arguments, the sub-command will go into a loop and
34 continuously apply updates as they become available. Giving `--once` just
35 downloads and imports the next batch of updates.
40 group = parser.add_argument_group('Arguments for initialisation')
41 group.add_argument('--init', action='store_true',
42 help='Initialise the update process')
43 group.add_argument('--no-update-functions', dest='update_functions',
45 help="Do not update the trigger function to "
46 "support differential updates (EXPERT)")
47 group = parser.add_argument_group('Arguments for updates')
48 group.add_argument('--check-for-updates', action='store_true',
49 help='Check if new updates are available and exit')
50 group.add_argument('--once', action='store_true',
51 help="Download and apply updates only once. When "
52 "not set, updates are continuously applied")
53 group.add_argument('--catch-up', action='store_true',
54 help="Download and apply updates until no new "
55 "data is available on the server")
56 group.add_argument('--no-index', action='store_false', dest='do_index',
57 help=("Do not index the new data. Only usable "
58 "together with --once"))
59 group.add_argument('--osm2pgsql-cache', metavar='SIZE', type=int,
60 help='Size of cache to be used by osm2pgsql (in MB)')
61 group = parser.add_argument_group('Download parameters')
62 group.add_argument('--socket-timeout', dest='socket_timeout', type=int, default=60,
63 help='Set timeout for file downloads')
66 def _init_replication(args):
67 from ..tools import replication, refresh
69 LOG.warning("Initialising replication updates")
70 with connect(args.config.get_libpq_dsn()) as conn:
71 replication.init_replication(conn, base_url=args.config.REPLICATION_URL)
72 if args.update_functions:
73 LOG.warning("Create functions")
74 refresh.create_functions(conn, args.config, True, False)
79 def _check_for_updates(args):
80 from ..tools import replication
82 with connect(args.config.get_libpq_dsn()) as conn:
83 return replication.check_for_updates(conn, base_url=args.config.REPLICATION_URL)
86 def _report_update(batchdate, start_import, start_index):
87 def round_time(delta):
88 return dt.timedelta(seconds=int(delta.total_seconds()))
90 end = dt.datetime.now(dt.timezone.utc)
91 LOG.warning("Update completed. Import: %s. %sTotal: %s. Remaining backlog: %s.",
92 round_time((start_index or end) - start_import),
93 "Indexing: {} ".format(round_time(end - start_index))
94 if start_index else '',
95 round_time(end - start_import),
96 round_time(end - batchdate))
100 def _compute_update_interval(args):
104 update_interval = args.config.get_int('REPLICATION_UPDATE_INTERVAL')
105 # Sanity check to not overwhelm the Geofabrik servers.
106 if 'download.geofabrik.de' in args.config.REPLICATION_URL\
107 and update_interval < 86400:
108 LOG.fatal("Update interval too low for download.geofabrik.de.\n"
109 "Please check install documentation "
110 "(https://nominatim.org/release-docs/latest/admin/Import-and-Update#"
111 "setting-up-the-update-process).")
112 raise UsageError("Invalid replication update interval setting.")
114 return update_interval
119 from ..tools import replication
120 from ..indexer.indexer import Indexer
121 from ..tokenizer import factory as tokenizer_factory
123 update_interval = UpdateReplication._compute_update_interval(args)
125 params = args.osm2pgsql_options(default_cache=2000, default_threads=1)
126 params.update(base_url=args.config.REPLICATION_URL,
127 update_interval=update_interval,
128 import_file=args.project_dir / 'osmosischange.osc',
129 max_diff_size=args.config.get_int('REPLICATION_MAX_DIFF'),
130 indexed_only=not args.once)
133 if not args.do_index:
134 LOG.fatal("Indexing cannot be disabled when running updates continuously.")
135 raise UsageError("Bad argument '--no-index'.")
136 recheck_interval = args.config.get_int('REPLICATION_RECHECK_INTERVAL')
138 tokenizer = tokenizer_factory.get_tokenizer_for_db(args.config)
139 indexer = Indexer(args.config.get_libpq_dsn(), tokenizer, args.threads or 1)
142 with connect(args.config.get_libpq_dsn()) as conn:
143 start = dt.datetime.now(dt.timezone.utc)
144 state = replication.update(conn, params)
145 if state is not replication.UpdateState.NO_CHANGES:
146 status.log_status(conn, start, 'import')
147 batchdate, _, _ = status.get_status(conn)
150 if state is not replication.UpdateState.NO_CHANGES and args.do_index:
151 index_start = dt.datetime.now(dt.timezone.utc)
152 indexer.index_full(analyse=False)
154 with connect(args.config.get_libpq_dsn()) as conn:
155 status.set_indexed(conn, True)
156 status.log_status(conn, index_start, 'index')
161 if state is replication.UpdateState.NO_CHANGES and \
162 args.catch_up or update_interval > 40*60:
163 while indexer.has_pending():
164 indexer.index_full(analyse=False)
166 if LOG.isEnabledFor(logging.WARNING):
167 UpdateReplication._report_update(batchdate, start, index_start)
169 if args.once or (args.catch_up and state is replication.UpdateState.NO_CHANGES):
172 if state is replication.UpdateState.NO_CHANGES:
173 LOG.warning("No new changes. Sleeping for %d sec.", recheck_interval)
174 time.sleep(recheck_interval)
179 socket.setdefaulttimeout(args.socket_timeout)
182 return UpdateReplication._init_replication(args)
184 if args.check_for_updates:
185 return UpdateReplication._check_for_updates(args)
187 UpdateReplication._update(args)