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tsindex.py
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tsindex.py
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# -*- coding: utf-8 -*-
r"""
obspy.clients.filesystem.tsindex - IRIS TSIndex Client and Indexer
==========================================================================
The obspy.clients.filesystem.tsindex module includes a timeseries extraction
:class:`~obspy.clients.filesystem.tsindex.Client` class for a database created
by the IRIS
`mseedindex <https://github.com/iris-edu/mseedindex>`_ program, as well as, a
:class:`~obspy.clients.filesystem.tsindex.Indexer` class for creating a SQLite3
database that follows the IRIS `tsindex database
schema <https://github.com/iris-edu/mseedindex/wiki/Database-Schema/>`_\.
:copyright:
Nick Falco, Chad Trabant, IRISDMC, 2018
The ObsPy Development Team (devs@obspy.org)
:license:
GNU Lesser General Public License, Version 3
(https://www.gnu.org/copyleft/lesser.html)
.. contents:: Contents
:local:
:depth: 2
------------
Client Usage
------------
The first step is always to initialize a client object.
.. highlight:: python
>>> from obspy.clients.filesystem.tsindex import Client
>>> from obspy.clients.filesystem.tests.test_tsindex \
import get_test_data_filepath
>>> import os
>>> # for this example get the file path to test data
>>> filepath = get_test_data_filepath()
>>> db_path = os.path.join(filepath, 'timeseries.sqlite')
>>> # create a new Client instance
>>> client = Client(db_path, datapath_replace=("^", filepath))
The example below uses the test SQLite3 tsindex database included with ObsPy to
illustrate how to do the following:
* Determine what data is available in the tsindex database using
:meth:`~obspy.clients.filesystem.tsindex.Client.get_availability_extent()`
and :meth:`~obspy.clients.filesystem.tsindex.Client.get_availability()`, as
well as, the percentage of data available using
:meth:`~obspy.clients.filesystem.tsindex.Client.get_availability_percentage()`.
* Request available timeseries data using
:meth:`~obspy.clients.filesystem.tsindex.Client.get_waveforms()` and
:meth:`~obspy.clients.filesystem.tsindex.Client.get_waveforms_bulk()`.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Determining Data Availability
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
* :meth:`~obspy.clients.filesystem.tsindex.Client.get_availability_extent()`:
Returns a list of (network, station, location, channel, earliest, latest)
tuples that represent the full extent of available data. This example
retrieves from the very small obspy test tsindex database a list of all
available ("BHZ") channel extents from the Global Seismograph Network
("IU") for all times.
>>> extents = client.get_availability_extent(network="IU", channel="BHZ")
>>> for extent in extents:
... print("{0:<3} {1:<6} {2:<3} {3:<4} {4} {5}".format(*extent))
IU ANMO 10 BHZ 2018-01-01T00:00:00.019500Z 2018-01-01T00:00:59.994536Z
IU COLA 10 BHZ 2018-01-01T00:00:00.019500Z 2018-01-01T00:00:59.994538Z
* :meth:`~obspy.clients.filesystem.tsindex.Client.get_availability()`:
Works in the same way as
:meth:`~obspy.clients.filesystem.tsindex.Client.get_availability_extent()`
but returns a list of (network, station, location, channel, starttime,
endtime) tuples representing contiguous time spans for selected channels
and time ranges.
* :meth: \
`~obspy.clients.filesystem.tsindex.Client.get_availability_percentage()`:
Returns the tuple(float, int) of percentage of available data
(``0.0`` to ``1.0``) and number of gaps/overlaps. Availability percentage is
calculated relative to the provided ``starttime`` and ``endtime``.
>>> from obspy import UTCDateTime
>>> avail_percentage = client.get_availability_percentage( \
"IU", \
"ANMO", \
"10", \
"BHZ", \
UTCDateTime(2018, 1, 1, 0, 0, 0, 19500), \
UTCDateTime(2018, 1, 1, 0, 1, 57, 994536))
>>> print(avail_percentage)
(0.5083705674817509, 1)
^^^^^^^^^^^^^^^^^^^^^^^^^^
Requesting Timeseries Data
^^^^^^^^^^^^^^^^^^^^^^^^^^
* :meth:`~obspy.clients.filesystem.tsindex.Client.get_waveforms()`:
This example illustrates how to request 1 second of available ("IU")
timeseries data in the test tsindex database. Results are returned as a
:class:`~obspy.core.stream.Stream` object. See the
:meth:`~obspy.clients.filesystem.tsindex.Client.get_waveforms_bulk()`
method for information on how to make multiple requests at once.
>>> t = UTCDateTime("2018-01-01T00:00:00.019500")
>>> st = client.get_waveforms("IU", "*", "*", "BHZ", t, t + 1)
>>> st.plot() # doctest: +SKIP
.. plot::
from obspy import UTCDateTime
from obspy.clients.filesystem.tsindex import Client
from obspy.clients.filesystem.tests.test_tsindex \
import get_test_data_filepath
# for this example get the file path to test data
filepath = get_test_data_filepath()
db_path = os.path.join(filepath, 'timeseries.sqlite')
# create a new Client instance
client = Client(db_path, datapath_replace=("^", filepath))
t = UTCDateTime("2018-01-01T00:00:00.019500")
st = client.get_waveforms("IU", "*", "*", "BHZ", t, t + 1)
st.plot()
-------------
Indexer Usage
-------------
The :class:`~obspy.clients.filesystem.tsindex.Indexer` provides a high level
API for indexing a directory tree of miniSEED files using the IRIS
`mseedindex <https://github.com/iris-edu/mseedindex/>`_ software.
Initialize a indexer object by supplying the root path to data to be indexed.
>>> from obspy.clients.filesystem.tsindex import Indexer
>>> from obspy.clients.filesystem.tests.test_tsindex \
import get_test_data_filepath
>>> # for this example get the file path to test data
>>> filepath = get_test_data_filepath()
>>> # create a new Indexer instance
>>> indexer = Indexer(filepath, filename_pattern='*.mseed')
Index a directory tree of miniSEED files by calling
:meth:`~obspy.clients.filesystem.tsindex.Indexer.run`. By default this will
create a database called ``timeseries.sqlite`` in the current working
directory. The name of the index database can be changed by supplying the
``database`` parameter when instantiating the
:class:`~obspy.clients.filesystem.tsindex.Indexer` object.
.. code-block:: python
indexer.run()
"""
from __future__ import (absolute_import, division, print_function,
unicode_literals)
from future.builtins import * # NOQA
from future.utils import native_str
import os
from os.path import relpath
from glob import glob
import datetime
import subprocess
import copyreg
from multiprocessing import Pool
import types
import logging
import requests
from collections import namedtuple
import sqlalchemy as sa
from sqlalchemy.exc import ResourceClosedError
from sqlalchemy.orm import sessionmaker
from sqlalchemy.pool import QueuePool
from obspy import UTCDateTime
from obspy.core.stream import Stream
from obspy.clients.filesystem.miniseed import MiniseedDataExtractor, \
NoDataError
from obspy.clients.filesystem.db import get_tsindex_table, \
get_tsindex_summary_table
# Setup the logger.
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)
# Prevent propagating to higher loggers.
logger.propagate = 0
# Console log handler. By default any logs of level info and above are
# written to the console
ch = logging.StreamHandler()
ch.setLevel(logging.INFO)
# Add formatter
FORMAT = "[%(asctime)s] - %(name)s - %(levelname)s: %(message)s"
formatter = logging.Formatter(FORMAT)
ch.setFormatter(formatter)
logger.addHandler(ch)
def _pickle_method(m):
"""
Allows serializing of class and instance methods.
"""
if m.im_self is None:
return getattr, (m.im_class, m.im_func.func_name)
else:
return getattr, (m.im_self, m.im_func.func_name)
copyreg.pickle(types.MethodType, _pickle_method)
class Client(object):
"""
Time series extraction client for IRIS tsindex database schema.
"""
def __init__(self, database, datapath_replace=None, debug=False):
"""
Initializes the client.
:type database: str or
:class:`~obspy.clients.filesystem.tsindex.TSIndexDatabaseHandler`
:param database: Path to sqlite tsindex database or a
TSIndexDatabaseHandler object
:type datapath_replace: 2-value tuple(str, str)
:param datapath_replace: A 2-value ``tuple(str, str)``, where any
occurrence of the first value will be replaced with the second
value in åfilename paths from the index.
:type debug: bool
:param debug: Debug flag.
"""
self.debug = debug
if self.debug is True:
# write debug level logs to the console
ch.setLevel(logging.DEBUG)
# setup handler for database
if isinstance(database, (str, native_str)):
self.request_handler = TSIndexDatabaseHandler(database,
debug=self.debug)
elif isinstance(database, TSIndexDatabaseHandler):
self.request_handler = database
else:
raise ValueError("database must be a string or "
"TSIndexDatabaseHandler object.")
# Create and configure the data extraction
self.data_extractor = MiniseedDataExtractor(
dp_replace=datapath_replace,
debug=self.debug)
def get_waveforms(self, network, station, location,
channel, starttime, endtime, merge=-1):
"""
Query tsindex database and read miniSEED data from local indexed
directory tree.
:type network: str
:param network: Network code of requested data (e.g. "IU").
Wildcards '*' and '?' are supported.
:type station: str
:param station: Station code of requested data (e.g. "ANMO").
Wildcards '*' and '?' are supported.
:type location: str
:param location: Location code of requested data (e.g. "").
Wildcards '*' and '?' are supported.
:type channel: str
:param channel: Channel code of requested data (e.g. "HHZ").
Wildcards '*' and '?' are supported.
:type starttime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param starttime: Start of requested time window.
:type endtime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param endtime: End of requested time window.
:type merge: int or None
:param merge: Specifies, which merge operation should be performed
on the stream before returning the data. Default (``-1``) means
only a conservative cleanup merge is performed to merge seamless
traces (e.g. when reading across day boundaries). See
:meth:`Stream.merge() <obspy.core.stream.Stream.merge>` for
details. If set to ``None`` (or ``False``) no merge operation at
all will be performed.
:rtype: :class:`~obspy.core.stream.Stream`
:returns: A ObsPy :class:`~obspy.core.stream.Stream` object containing
requested timeseries data.
"""
query_rows = [(network, station, location,
channel, starttime, endtime)]
return self._get_waveforms(query_rows, merge)
def get_waveforms_bulk(self, query_rows, merge=-1):
"""
Query tsindex database and read miniSEED data from local indexed
directory tree using a bulk request.
:type query_rows: list(tuple(str, str, str, str,
:class:`~obspy.core.utcdatetime.UTCDateTime`,
:class:`~obspy.core.utcdatetime.UTCDateTime`)
:param query_rows: A list of tuples [(net, sta, loc, cha, starttime,
endtime),...] containing information on what timeseries should be
returned from the indexed archive.
Wildcards '*' and '?' are supported.
:type merge: int or None
:param merge: Specifies, which merge operation should be performed
on the stream before returning the data. Default (``-1``) means
only a conservative cleanup merge is performed to merge seamless
traces (e.g. when reading across day boundaries). See
:meth:`Stream.merge() <obspy.core.stream.Stream.merge>` for
details. If set to ``None`` (or ``False``) no merge operation at
all will be performed.
:rtype: :class:`~obspy.core.stream.Stream`
:returns: A ObsPy :class:`~obspy.core.stream.Stream` object containing
requested timeseries data.
"""
return self._get_waveforms(query_rows, merge)
def get_nslc(self, network=None, station=None, location=None,
channel=None, starttime=None, endtime=None):
"""
Get a list of tuples [(net, sta, loc, cha),...] containing information
on what streams are included in the tsindex database.
:type network: str
:param network: Network code of requested data (e.g. "IU").
Wildcards '*' and '?' are supported.
:type station: str
:param station: Station code of requested data (e.g. "ANMO").
Wildcards '*' and '?' are supported.
:type location: str
:param location: Location code of requested data (e.g. "").
Wildcards '*' and '?' are supported.
:type channel: str
:param channel: Channel code of requested data (e.g. "HHZ").
Wildcards '*' and '?' are supported.
:type starttime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param starttime: Start of requested time window.
:type endtime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param endtime: End of requested time window.
:rtype: list(tuple(str, str, str, str))
:returns: A list of tuples [(network, station, location, channel)...]
containing information on what streams are included in the tsindex
database.
"""
summary_rows = self._get_summary_rows(network, station, location,
channel, starttime, endtime)
nslc_list = []
for row in summary_rows:
nslc = (row.network, row.station, row.location, row.channel)
nslc_list.append(nslc)
nslc_list.sort()
return nslc_list
def get_availability_extent(self, network=None, station=None,
location=None, channel=None, starttime=None,
endtime=None):
"""
Get a list of tuples [(network, station, location, channel,
earliest, latest)] containing data extent info for time series
included in the tsindex database.
:type network: str
:param network: Network code of requested data (e.g. "IU").
Wildcards '*' and '?' are supported.
:type station: str
:param station: Station code of requested data (e.g. "ANMO").
Wildcards '*' and '?' are supported.
:type location: str
:param location: Location code of requested data (e.g. "").
Wildcards '*' and '?' are supported.
:type channel: str
:param channel: Channel code of requested data (e.g. "HHZ").
Wildcards '*' and '?' are supported.
:type starttime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param starttime: Start of requested time window.
:type endtime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param endtime: End of requested time window.
:rtype: list(tuple(str, str, str, str,
:class:`~obspy.core.utcdatetime.UTCDateTime`,
:class:`~obspy.core.utcdatetime.UTCDateTime`))
:returns: A list of tuples [(network, station, location, channel,
earliest, latest)...] containing data extent info for time series
included in the tsindex database.
"""
summary_rows = self._get_summary_rows(network, station,
location, channel,
starttime, endtime)
availability_extents = []
for row in summary_rows:
extent = (row.network, row.station, row.location, row.channel,
UTCDateTime(row.earliest), UTCDateTime(row.latest))
availability_extents.append(extent)
availability_extents.sort()
return availability_extents
def get_availability(self, network=None, station=None, location=None,
channel=None, starttime=None, endtime=None,
include_sample_rate=False,
merge_overlap=False):
"""
Get a list of tuples [(network, station, location, channel,
starttime, endtime),...] containing data availability info for
time series included in the tsindex database.
If ``include_sample_rate=True``, then a tuple containing the sample
rate [(net, sta, loc, cha, start, end, sample_rate),...] is returned.
If ``merge_overlap=True``, then all time spans that overlap are merged.
:type network: str
:param network: Network code of requested data (e.g. "IU").
Wildcards '*' and '?' are supported.
:type station: str
:param station: Station code of requested data (e.g. "ANMO").
Wildcards '*' and '?' are supported.
:type location: str
:param location: Location code of requested data (e.g. "").
Wildcards '*' and '?' are supported.
:type channel: str
:param channel: Channel code of requested data (e.g. "HHZ").
Wildcards '*' and '?' are supported.
:type starttime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param starttime: Start of requested time window.
:type endtime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param endtime: End of requested time window.
:type include_sample_rate: bool
:param include_sample_rate: If ``include_sample_rate=True``, then
a tuple containing the sample rate [(net, sta, loc, cha,
start, end, sample_rate),...] is returned.
:type merge_overlap: bool
:param merge_overlap: If ``merge_overlap=True``, then all time
spans that overlap are merged.
:rtype: list(tuple(str, str, str, str,
:class:`~obspy.core.utcdatetime.UTCDateTime`,
:class:`~obspy.core.utcdatetime.UTCDateTime`))
:returns: A list of tuples [(network, station, location, channel,
earliest, latest)...] representing contiguous time spans for
selected channels and time ranges.
"""
tsindex_rows = self._get_tsindex_rows(network, station,
location, channel,
starttime, endtime)
grouped_channels = {}
for row in tsindex_rows:
if include_sample_rate is True:
# split on different sample rates when merging
hash = "{}_{}_{}_{}_{}".format(row.network,
row.station,
row.location,
row.channel,
row.samplerate)
else:
# ignore sample rate when merging
hash = "{}_{}_{}_{}".format(row.network,
row.station,
row.location,
row.channel)
timespans = self._create_timespans_list(row.timespans)
if grouped_channels.get(hash) is not None:
if row.samplerate not in \
grouped_channels[hash]["samplerates"]:
grouped_channels[hash]["samplerates"].append(
row.samplerate)
grouped_channels[hash]["timespans"].extend(timespans)
else:
grouped_channels[hash] = {}
grouped_channels[hash]["samplerates"] = [row.samplerate]
grouped_channels[hash]["timespans"] = timespans
# sort timespans
for _, channel_group in grouped_channels.items():
channel_group["timespans"].sort()
# join timespans
joined_avail_tuples = []
for sncl, channel_group in grouped_channels.items():
net, sta, loc, cha = sncl.split("_")[:4]
samplerates = channel_group["samplerates"]
timespans = channel_group["timespans"]
avail_data = self._get_availability_from_timespans(
net,
sta,
loc,
cha,
samplerates,
include_sample_rate,
merge_overlap,
timespans
)
# extend complete list of available data
joined_avail_tuples.extend(avail_data)
joined_avail_tuples.sort()
return joined_avail_tuples
def get_availability_percentage(self, network, station,
location, channel,
starttime, endtime):
"""
Get percentage of available data.
:type network: str
:param network: Network code of requested data (e.g. "IU").
:type station: str
:param station: Station code of requested data (e.g. "ANMO").
:type location: str
:param location: Location code of requested data (e.g. "").
:type channel: str
:param channel: Channel code of requested data (e.g. "HHZ").
:type starttime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param starttime: Start of requested time window.
:type endtime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param endtime: End of requested time window.
:rtype: tuple(float, int)
:returns: Tuple of percentage of available data (``0.0`` to ``1.0``)
and number of gaps/overlaps.
"""
avail = self.get_availability(network, station,
location, channel,
starttime, endtime,
merge_overlap=True)
if not avail:
return (0, 1)
total_duration = endtime - starttime
# sum up gaps in the middle
gap_sum = 0
gap_count = 0
for idx, cur_ts in enumerate(avail[1:]):
prev_ts = avail[idx]
gap_count = gap_count + 1
gap_sum += cur_ts[4] - prev_ts[5]
# check if we have a gap at start or end
earliest = min([ts[4] for ts in avail])
latest = max([ts[5] for ts in avail])
if earliest > starttime:
gap_sum += earliest - starttime
gap_count += 1
if latest < endtime:
gap_sum += endtime - latest
gap_count += 1
return (1 - (gap_sum / total_duration), gap_count)
def has_data(self, network=None, station=None, location=None,
channel=None, starttime=None, endtime=None):
"""
Return whether there is data for a specified network, station,
location, channel, starttime, and endtime combination.
:type network: str
:param network: Network code of requested data (e.g. "IU").
Wildcards '*' and '?' are supported.
:type station: str
:param station: Station code of requested data (e.g. "ANMO").
Wildcards '*' and '?' are supported.
:type location: str
:param location: Location code of requested data (e.g. "").
Wildcards '*' and '?' are supported.
:type channel: str
:param channel: Channel code of requested data (e.g. "HHZ").
Wildcards '*' and '?' are supported.
:type starttime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param starttime: Start of requested time window. Defaults to
minimum possible start date.
:type endtime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param endtime: End of requested time window. Defaults to maximum
possible end date.
:rtype: bool
:returns: Returns ``True`` if there is data in the index for a given
network, station, location, channel, starttime, endtime.
"""
if starttime is None:
starttime = UTCDateTime(year=datetime.MINYEAR,
month=1,
day=1)
if endtime is None:
endtime = UTCDateTime(year=datetime.MAXYEAR,
month=12,
day=31)
avail_percentage = self.get_availability_percentage(network,
station,
location,
channel,
starttime,
endtime)[0]
if avail_percentage > 0:
return True
else:
return False
def _get_summary_rows(self, network, station, location, channel,
starttime, endtime):
"""
Return a list of tuples [(net, sta, loc, cha, earliest, latest),...]
containing information found in the tsindex_summary table.
Information about the tsindex_summary schema may be found in the
`mseedindex wiki <https://github.com/iris-edu/mseedindex/wiki/\
Database-Schema#suggested-time-series-summary-table>`_.
:type network: str
:param network: Network code of requested data (e.g. "IU").
Wildcards '*' and '?' are supported.
:type station: str
:param station: Station code of requested data (e.g. "ANMO").
Wildcards '*' and '?' are supported.
:type location: str
:param location: Location code of requested data (e.g. "").
Wildcards '*' and '?' are supported.
:type channel: str
:param channel: Channel code of requested data (e.g. "HHZ").
Wildcards '*' and '?' are supported.
:type starttime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param starttime: Start of requested time window.
:type endtime: :class:`~obspy.core.utcdatetime.UTCDateTime`
"""
query_rows = [(network, station, location,
channel, starttime, endtime)]
return self.request_handler._fetch_summary_rows(query_rows)
def _get_waveforms(self, query_rows, merge=-1):
"""
Query tsindex database and read miniSEED data from local
indexed directory tree using a bulk request and return a
:class:`~obspy.core.stream.Stream` object containing the requested
timeseries data.
:type query_rows: list(tuple(str, str, str, str,
:class:`~obspy.core.utcdatetime.UTCDateTime`,
:class:`~obspy.core.utcdatetime.UTCDateTime`))
:param query_rows: A list of tuples [(net, sta, loc, cha, starttime,
endtime),...] containing information on what timeseries should be
returned from the indexed archive.
Wildcards '*' and '?' are supported.
:type merge: int or None
:param merge: Specifies, which merge operation should be performed
on the stream before returning the data. Default (``-1``) means
only a conservative cleanup merge is performed to merge seamless
traces (e.g. when reading across day boundaries). See
:meth:`Stream.merge() <obspy.core.stream.Stream.merge>` for
details. If set to ``None`` (or ``False``) no merge operation at
all will be performed.
"""
# Get the corresponding index DB entries
index_rows = self.request_handler._fetch_index_rows(query_rows)
total_bytes = 0
src_bytes = {}
logger.debug("Starting data return")
st = Stream(traces=[])
try:
# Extract the data, writing each returned segment to the response
for data_segment in self.data_extractor.extract_data(index_rows):
bytes_written = data_segment.get_num_bytes()
src_name = data_segment.get_src_name()
if bytes_written > 0:
st_segment = data_segment.read_stream()
st += st_segment
total_bytes += bytes_written
src_bytes.setdefault(src_name, 0)
src_bytes[src_name] += bytes_written
except NoDataError:
logger.debug("No data matched selection")
logger.debug("Wrote {} bytes".format(total_bytes))
if merge:
st.merge(merge)
return st
def _get_tsindex_rows(self, network, station, location, channel, starttime,
endtime):
"""
Return a list of tuples [(net, sta, loc, cha, quality... etc.),...]
containing information found in the tsindex table.
Information about the tsindex schema may be found in the
`mseedindex wiki <https://github.com/iris-edu/mseedindex/wiki/\
Database-Schema#sqlite-schema-version-11>`_.
:type network: str
:param network: Network code of requested data (e.g. "IU").
Wildcards '*' and '?' are supported.
:type station: str
:param station: Station code of requested data (e.g. "ANMO").
Wildcards '*' and '?' are supported.
:type location: str
:param location: Location code of requested data (e.g. "").
Wildcards '*' and '?' are supported.
:type channel: str
:param channel: Channel code of requested data (e.g. "HHZ").
Wildcards '*' and '?' are supported.
:type starttime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param starttime: Start of requested time window.
:type endtime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param endtime: End of requested time window.
"""
query_rows = [(network, station, location,
channel, starttime, endtime)]
return self.request_handler._fetch_index_rows(query_rows)
def _get_availability_from_timespans(self, network, station,
location, channel,
samplerates,
include_sample_rate,
merge_overlap,
timespans,
_sncl_joined_avail_tuples=None):
"""
Recurse over a list of timespans, joining adjacent timespans,
and merging if merge_overlaps is ``True``.
Returns a list of tuples (network, station, location, channel,
earliest, latest) representing available data.
:type network: str
:param network: Network code of requested data (e.g. "IU").
Wildcards '*' and '?' are supported.
:type station: str
:param station: Station code of requested data (e.g. "ANMO").
Wildcards '*' and '?' are supported.
:type location: str
:param location: Location code of requested data (e.g. "").
Wildcards '*' and '?' are supported.
:type channel: str
:param channel: Channel code of requested data (e.g. "HHZ").
Wildcards '*' and '?' are supported.
:type starttime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param starttime: Start of requested time window.
:type endtime: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param endtime: End of requested time window.
:type timespans: list
:param timespans: List of timespan tuples.
"""
if _sncl_joined_avail_tuples is None:
_sncl_joined_avail_tuples = []
sr = min(samplerates)
if len(timespans) > 1:
prev_ts = timespans.pop(0)
cur_ts = timespans.pop(0)
if merge_overlap is True and \
self._do_timespans_overlap(prev_ts, cur_ts) is True:
# merge if overlapping timespans and merge_overlap
# option is set to true
merged_ts = self._create_timespan(prev_ts.earliest,
cur_ts.latest)
timespans.insert(0, merged_ts)
return self._get_availability_from_timespans(
network, station,
location, channel,
samplerates,
include_sample_rate,
merge_overlap,
timespans,
_sncl_joined_avail_tuples)
elif self._are_timespans_adjacent(prev_ts, cur_ts, sr, 0.5):
# merge if timespans are next to each other within
# a 0.5 sample tolerance
merged_ts = self._create_timespan(prev_ts.earliest,
cur_ts.latest)
timespans.insert(0, merged_ts)
return self._get_availability_from_timespans(
network, station,
location, channel,
samplerates,
include_sample_rate,
merge_overlap,
timespans,
_sncl_joined_avail_tuples)
else:
# timespan shouldn't be merged so add to list
avail_tuple = self._create_avail_tuple(
network, station,
location, channel,
prev_ts.earliest,
prev_ts.latest,
sr=sr if include_sample_rate
else None)
_sncl_joined_avail_tuples.append(avail_tuple)
timespans.insert(0, cur_ts)
return self._get_availability_from_timespans(
network, station,
location, channel,
samplerates,
include_sample_rate,
merge_overlap,
timespans,
_sncl_joined_avail_tuples)
else:
# no other timespans to merge with
cur_ts = timespans.pop(0)
avail_tuple = self._create_avail_tuple(
network, station,
location, channel,
cur_ts.earliest,
cur_ts.latest,
sr=sr if include_sample_rate
else None)
_sncl_joined_avail_tuples.append(avail_tuple)
return _sncl_joined_avail_tuples
def _are_timespans_adjacent(self, ts1, ts2, sample_rate, tolerance=0.5):
"""
Checks whether or not two time span named tuples
(e.g. NameTuple(earliest, latest)) are adjacent within
a given tolerance.
:type ts1: NamedTuple
:param ts1: Earliest timespan.
:type ts2: NamedTuple
:param ts2: Latest timespan.
:type sample_rate: int
:param sample_rate: Sensor sample rate.
:type tolerance: float
:param tolerance: Tolerance to determine whether a adjacent
timespan should be merged.
"""
# @40Hz sample period = 0.025
sample_period = 1. / float(sample_rate)
expected_next = ts1.latest + sample_period
# @40Hz tolerance = 0.0125
tolerance_amount = (tolerance*sample_period)
actual_next = ts2.earliest
if expected_next + tolerance_amount > actual_next and \
expected_next - tolerance_amount < actual_next:
return True
else:
return False
def _do_timespans_overlap(self, ts1, ts2):
"""
Checks whether or not two time span named tuples
(e.g. NameTuple(earliest, latest)) intersect with
one another.
:type ts1: namedtuple
:param ts1: Earliest timespan.
:type ts2: namedtuple
:param ts2: Latest timespan.
"""
if ts1.earliest <= ts2.latest and \
ts1.latest >= ts2.earliest:
return True
else:
return False
def _create_avail_tuple(self, network, station, location, channel,
earliest, latest, sr=None):
"""
Returns a tuple representing available waveform data.
:type network: str
:param network: Network code of requested data (e.g. "IU").
Wildcards '*' and '?' are supported.
:type station: str
:param station: Station code of requested data (e.g. "ANMO").
Wildcards '*' and '?' are supported.
:type location: str
:param location: Location code of requested data (e.g. "").
Wildcards '*' and '?' are supported.
:type channel: str
:param channel: Channel code of requested data (e.g. "HHZ").
Wildcards '*' and '?' are supported.
:type earliest: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param earliest: Earliest date of timespan.
:type latest: :class:`~obspy.core.utcdatetime.UTCDateTime`
:param latest: Latest date of timespan.
:type sr: float
:param sr: Sensor sample rate (optional).
"""
if sr is not None:
avail_record = (network, station, location, channel,
UTCDateTime(float(earliest)),
UTCDateTime(float(latest)), sr)
else:
avail_record = (network, station, location, channel,
UTCDateTime(float(earliest)),
UTCDateTime(float(latest)))
return avail_record
def _create_timespan(self, earliest, latest):
"""
Create a ``TimeSpan`` named tuple object given a earliest and latest
date.
:param earliest: Earliest date of timespan.
:param latest: Latest date of timespan.
"""
TimeSpan = namedtuple('TimeSpan',
['earliest', 'latest'])
return TimeSpan(earliest, latest)
def _create_timespans_list(self, raw_timespans):
"""
Given a timespans string from the database, return
a list of named tuples.
:type raw_timespans: str
:param raw_timespans: timespans field from tsindex database table.
"""
timespans = []
unparsed_timespans = \
raw_timespans.replace("[", "").replace("]", "").split(",")
for t in unparsed_timespans:
earliest, latest = t.split(":")
ts = self._create_timespan(float(earliest), float(latest))
timespans.append(ts)
return timespans
class Indexer(object):
"""
Build an index for miniSEED data using IRIS's mseedindex program.
Recursively search for files matching ``filename_pattern`` starting
from ``root_path`` and run ``index_cmd`` for each target file found that
is not already in the index. After all new files are indexed a summary
table is generated with the extents of each timeseries.
"""
def __init__(self, root_path, database="timeseries.sqlite",
leap_seconds_file="SEARCH", index_cmd='mseedindex',
bulk_params=None, filename_pattern='*', parallel=5,
debug=False):
"""
Initializes the Indexer.
:type root_path: str
:param root_path: Root path to the directory structure to index.
:type database: str or
:class:`~obspy.clients.filesystem.tsindex.TSIndexDatabaseHandler`
:param database: Path to sqlite tsindex database or a
TSIndexDatabaseHandler object. A database will be created
if one does not already exists at the specified path.
:type leap_seconds_file: str
:param leap_seconds_file: Path to leap seconds file. If set to
"SEARCH" (default), then the program looks for a leap seconds file
in the same directory as the sqlite3 database. If set to `None`
then no leap seconds file will be used.
In :meth:`~obspy.clients.filesystem.tsindex.Indexer.run` the leap
seconds listed in this file will be used to adjust the time
coverage for records that contain a leap second. Also, leap second
indicators in the miniSEED headers will be ignored. See the
`mseedindex wiki <https://github.com/iris-edu/mseedindex/blob/"
"master/doc/mseedindex.md#leap-second-list-file>`_ for more"
"for more information regarding this file.
:type index_cmd: str
:param index_cmd: Command to be run for each target file found that
is not already in the index
:type bulk_params: dict
:param bulk_params: Dictionary of options to pass to ``index_cmd``.
:type filename_pattern: str
:param filename_pattern: Glob pattern to determine what files to index.
:type parallel: int
:param parallel: Max number of ``index_cmd`` instances to run in
parallel. By default a max of 5 parallel process are run.
:type debug: bool
:param debug: Debug flag. Sets logging level to debug.
"""
self.debug = debug
if self.debug is True:
# write debug level logs to the console
ch.setLevel(logging.DEBUG)
self.index_cmd = index_cmd
if bulk_params is None:
bulk_params = {}
self.bulk_params = bulk_params
self.filename_pattern = filename_pattern
self.parallel = parallel
# setup handler for database
if isinstance(database, (str, native_str)):
self.request_handler = TSIndexDatabaseHandler(database,
debug=self.debug)
elif isinstance(database, TSIndexDatabaseHandler):
self.request_handler = database
else:
raise ValueError("Database must be a string or "
"TSIndexDatabaseHandler object.")
self.leap_seconds_file = self._get_leap_seconds_file(leap_seconds_file)
self.root_path = os.path.abspath(root_path)
if not os.path.isdir(self.root_path):
raise OSError("Root path `{}` does not exists."
.format(self.root_path))
def run(self, build_summary=True, relative_paths=False, reindex=False):
"""
Execute the file discovery and indexing.