A reference implementation for processing the content.log files found at opendata.dwd.de/weather

Deutscher Wetterdienst (DWD)

Last update: Nov 26, 2022

Related tags

Miscellaneous opendata-content.log-tool

Overview

content.log Tool

A reference implementation for processing the content.log files found at opendata.dwd.de/weather.

Example usage:

wildcards.txt ./get_updated_files.py -w wildcards.txt 2022-01-26T03:00 > updated_files.txt">

wget https://opendata.dwd.de/weather/nwp/content.log.bz2
bunzip2 content.log.bz2
echo "./icon-d2/grib/*/t_2m/*" > wildcards.txt
./get_updated_files.py -w wildcards.txt 2022-01-26T03:00 > updated_files.txt

The produced file updated_files.txt will hold all pathnames as given by content.log that are updated since 2022-01-26 03:00:00 UTC according to the file's modification date. Remember that those paths are relative to the directory the content.log.bz2 was in, in this case https://opendata.dwd.de/weather/nwp/.

Also mind that there are multiple servers behind https://opendata.dwd.de which might not be exactly in sync with each other regarding file modification timestamps. Look into the code of get_updated_files.py for a suggestion on how to deal with that.

While this program relies on the file modification timestamp dumped into content.log.bz2, it might be more feasible to process the data reference time that is contained in the filenames instead.

$ ./get_updated_files.py --help
usage: get_updated_files.py [-h] [--content-log CONTENT_LOG_FILE] [--wildcards WILDCARDS_FILE] [--min-delta MIN_DELTA] [--version] UPDATED_SINCE

Filters paths of a DWD Open Data content.log file for entries that have been updated.

positional arguments:
  UPDATED_SINCE         Last time files were checked for updates

optional arguments:
  -h, --help            show this help message and exit
  --content-log CONTENT_LOG_FILE, -f CONTENT_LOG_FILE
                        The decompressed content.log file (default: content.log)
  --wildcards WILDCARDS_FILE, -w WILDCARDS_FILE
                        Filter results by a set of wildcards
  --min-delta MIN_DELTA, -d MIN_DELTA
                        Minimum number of seconds a file needs to be younger than UPDATED_SINCE (default: 60)
  --version             show program's version number and exit

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Comments

changing urljoin to os.path.join

The behavior of urljoin is on my opionion not constructive, because of its description "Construct a full (“absolute”) URL by combining a “base URL” (base) with another URL (url). Informally, this uses components of the base URL, in particular the addressing scheme, the network location and (part of) the path, to provide missing components in the relative URL." (https://docs.python.org/3/library/urllib.parse.html#urllib.parse.urljoin)

opened by nklever 0

Releases(v2.0.0)

v2.0.0(Jan 27, 2022)
This new major release introduces support for timezones. Also, the deprecated feature --wildcards was removed and instead the use of external tools like bzgrep on the compressed file content.log.bz2 are recommended. The content.log file was promoted to the

Changes

CONTENT_LOG_FILE is now a positional argument which defaults to STDIN when omitted

--updated-since is now a required option

New features

supply multiple CONTENT_LOG_FILEs as positional arguments to parse their combined content

--updated-since now supports timezones when specified as +HH:MM while assuming the system's time zone if not specified; date-times in content.log are always treated as UTC

Source code(tar.gz)
Source code(zip)
v1.1.0(Jan 27, 2022)
Changes

added --url-base option

deprecated --wildcards

Source code(tar.gz)
Source code(zip)
v1.0.0(Jan 27, 2022)
This is the first fully functional version. It implements minimal features with focus on readability to also act as a form of documentation around the quirks around DWD's Open Data emerging from having two seperate servers sitting behind opendata.dwd.de.

Features

List the paths contained in a content.log file for entries that have likely been updated since a given date-time

Filter those results by one or more --wildcards

Source code(tar.gz)
Source code(zip)