[8463d78] | 1 | #!/usr/bin/env python3 |
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[64cf353] | 2 | # -*- coding: utf-8 -*- |
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[991df6a] | 3 | #******************************************************************************* |
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| 4 | # @Author: Anne Fouilloux (University of Oslo) |
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| 5 | # |
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| 6 | # @Date: July 2014 |
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| 7 | # |
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| 8 | # @Change History: |
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| 9 | # February 2018 - Anne Philipp (University of Vienna): |
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| 10 | # - applied PEP8 style guide |
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| 11 | # - added documentation |
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| 12 | # - changed some naming |
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| 13 | # |
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| 14 | # @License: |
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[44174de] | 15 | # (C) Copyright 2014-2019. |
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| 16 | # Anne Philipp, Leopold Haimberger |
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[991df6a] | 17 | # |
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[44174de] | 18 | # SPDX-License-Identifier: CC-BY-4.0 |
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[ff99eae] | 19 | # |
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[44174de] | 20 | # This work is licensed under the Creative Commons Attribution 4.0 |
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| 21 | # International License. To view a copy of this license, visit |
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| 22 | # http://creativecommons.org/licenses/by/4.0/ or send a letter to |
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| 23 | # Creative Commons, PO Box 1866, Mountain View, CA 94042, USA. |
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[991df6a] | 24 | #******************************************************************************* |
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[64cf353] | 25 | |
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| 26 | # ------------------------------------------------------------------------------ |
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| 27 | # MODULES |
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| 28 | # ------------------------------------------------------------------------------ |
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[4ef5ba9] | 29 | from __future__ import print_function |
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[aa275fc] | 30 | |
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[4ef5ba9] | 31 | import os |
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[991df6a] | 32 | |
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[64cf353] | 33 | # ------------------------------------------------------------------------------ |
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| 34 | # CLASS |
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| 35 | # ------------------------------------------------------------------------------ |
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[268ee86] | 36 | class GribUtil(object): |
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[64cf353] | 37 | ''' |
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| 38 | Class for GRIB utilities (new methods) based on GRIB API |
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[44174de] | 39 | |
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| 40 | The GRIB API provides all necessary tools to work directly with the |
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| 41 | grib files. Nevertheless, the GRIB API tools are very basic and are in |
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| 42 | direct connection with the grib files. This class provides some higher |
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| 43 | functions which apply a set of GRIB API tools together in the respective |
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| 44 | context. So, the class initially contains a list of grib files (their |
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| 45 | names) and the using program then applies the methods directly on the |
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| 46 | class objects without having to think about how the actual GRIB API |
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| 47 | tools have to be arranged. |
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[64cf353] | 48 | ''' |
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| 49 | # -------------------------------------------------------------------------- |
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[efdb01a] | 50 | # CLASS FUNCTIONS |
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[64cf353] | 51 | # -------------------------------------------------------------------------- |
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| 52 | def __init__(self, filenames): |
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[268ee86] | 53 | '''Initialise an object of GribUtil and assign a list of filenames. |
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[274f9ef] | 54 | |
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| 55 | Parameters |
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| 56 | ---------- |
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| 57 | filenames : :obj:`list` of :obj:`strings` |
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| 58 | A list of filenames. |
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[64cf353] | 59 | |
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[274f9ef] | 60 | Return |
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| 61 | ------ |
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[64cf353] | 62 | |
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| 63 | ''' |
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| 64 | |
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[ff99eae] | 65 | self.filenames = filenames |
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[64cf353] | 66 | |
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| 67 | return |
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| 68 | |
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| 69 | |
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[0f89116] | 70 | def get_keys(self, keynames, wherekeynames, wherekeyvalues): |
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[274f9ef] | 71 | '''Get keyvalues for a given list of keynames a where statement |
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| 72 | can be given (list of key and list of values) |
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[64cf353] | 73 | |
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[274f9ef] | 74 | Parameters |
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| 75 | ---------- |
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| 76 | keynames : :obj:`list` of :obj:`string` |
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| 77 | List of keynames. |
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[64cf353] | 78 | |
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[0f89116] | 79 | wherekeynames : :obj:`list` of :obj:`string` |
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| 80 | List of key names for indexing grib message parameter. |
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[64cf353] | 81 | |
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[0f89116] | 82 | wherekeyvalues : :obj:`list` of :obj:`string` |
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| 83 | List of key values corresponding the key names. |
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[64cf353] | 84 | |
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[274f9ef] | 85 | Return |
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| 86 | ------ |
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| 87 | return_list : :obj:`list` of :obj:`string` |
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| 88 | List of keyvalues for given keynames. |
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[64cf353] | 89 | ''' |
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[4ef5ba9] | 90 | from eccodes import (codes_new_from_file, codes_is_defined, codes_get, |
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| 91 | codes_release) |
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[64cf353] | 92 | |
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| 93 | return_list = [] |
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| 94 | |
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[c77630a] | 95 | with open(self.filenames, 'rb') as fileid: |
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[d69b677] | 96 | |
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[c77630a] | 97 | gid = codes_new_from_file(fileid) |
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[64cf353] | 98 | |
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| 99 | if len(wherekeynames) != len(wherekeyvalues): |
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| 100 | raise Exception("Number of key values and key names must be \ |
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| 101 | the same. Give a value for each keyname!") |
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| 102 | |
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| 103 | select = True |
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| 104 | i = 0 |
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[d69b677] | 105 | for wherekey in wherekeynames: |
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[2e62398] | 106 | if not codes_is_defined(gid, wherekey): |
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[64cf353] | 107 | raise Exception("where key was not defined") |
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| 108 | |
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| 109 | select = (select and (str(wherekeyvalues[i]) == |
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[2e62398] | 110 | str(codes_get(gid, wherekey)))) |
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[64cf353] | 111 | i += 1 |
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| 112 | |
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[d69b677] | 113 | if select: |
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| 114 | llist = [] |
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| 115 | for key in keynames: |
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[2e62398] | 116 | llist.extend([str(codes_get(gid, key))]) |
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[d69b677] | 117 | return_list.append(llist) |
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[64cf353] | 118 | |
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[2e62398] | 119 | codes_release(gid) |
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[64cf353] | 120 | |
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[d69b677] | 121 | return return_list |
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[64cf353] | 122 | |
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| 123 | |
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[0f89116] | 124 | def set_keys(self, fromfile, keynames, keyvalues, wherekeynames, |
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| 125 | wherekeyvalues, filemode='wb'): |
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[274f9ef] | 126 | '''Opens the file to read the grib messages and then write |
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[268ee86] | 127 | the selected messages (with wherekeys) to a new output file. |
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| 128 | Also, the keyvalues of the passed list of keynames are set. |
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[64cf353] | 129 | |
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[274f9ef] | 130 | Parameters |
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| 131 | ---------- |
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| 132 | fromfile : :obj:`string` |
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| 133 | Filename of the input file to read the grib messages from. |
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[64cf353] | 134 | |
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[274f9ef] | 135 | keynames : :obj:`list` of :obj:`string` |
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[268ee86] | 136 | List of keynames to set in the selected messages. |
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| 137 | Default is an empty list. |
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[64cf353] | 138 | |
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[274f9ef] | 139 | keyvalues : :obj:`list` of :obj:`string` |
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[268ee86] | 140 | List of keyvalues to set in the selected messages. |
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| 141 | Default is an empty list. |
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[64cf353] | 142 | |
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[0f89116] | 143 | wherekeynames : :obj:`list` of :obj:`string` |
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[268ee86] | 144 | List of keynames to select correct message. |
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[64cf353] | 145 | |
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[0f89116] | 146 | wherekeyvalues : :obj:`list` of :obj:`string` |
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[268ee86] | 147 | List of keyvalues for keynames to select correct message. |
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[64cf353] | 148 | |
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[274f9ef] | 149 | filemode : :obj:`string`, optional |
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[c77630a] | 150 | Sets the mode for the output file. Default is "wb". |
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[64cf353] | 151 | |
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[274f9ef] | 152 | Return |
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| 153 | ------ |
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[64cf353] | 154 | |
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| 155 | ''' |
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[4ef5ba9] | 156 | from eccodes import (codes_grib_new_from_file, codes_is_defined, |
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| 157 | codes_get, codes_set, codes_write, |
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| 158 | codes_set_values, codes_release) |
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| 159 | |
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[268ee86] | 160 | if len(wherekeynames) != len(wherekeyvalues): |
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| 161 | raise Exception("Give a value for each keyname!") |
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| 162 | |
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[ff99eae] | 163 | fout = open(self.filenames, filemode) |
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[64cf353] | 164 | |
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[c77630a] | 165 | with open(fromfile, 'rb') as fin: |
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[268ee86] | 166 | gid = codes_grib_new_from_file(fin) |
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[64cf353] | 167 | |
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| 168 | select = True |
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| 169 | i = 0 |
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[d69b677] | 170 | for wherekey in wherekeynames: |
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[2e62398] | 171 | if not codes_is_defined(gid, wherekey): |
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[268ee86] | 172 | raise Exception("wherekey was not defined") |
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[64cf353] | 173 | |
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| 174 | select = (select and (str(wherekeyvalues[i]) == |
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[2e62398] | 175 | str(codes_get(gid, wherekey)))) |
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[64cf353] | 176 | i += 1 |
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| 177 | |
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[d69b677] | 178 | if select: |
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[64cf353] | 179 | i = 0 |
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[d69b677] | 180 | for key in keynames: |
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[268ee86] | 181 | if key == 'values': |
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| 182 | codes_set_values(gid, keyvalues[i]) |
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| 183 | else: |
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| 184 | codes_set(gid, key, keyvalues[i]) |
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[64cf353] | 185 | i += 1 |
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| 186 | |
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[268ee86] | 187 | codes_write(gid, fout) |
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[ff99eae] | 188 | |
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[2e62398] | 189 | codes_release(gid) |
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[64cf353] | 190 | |
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[d69b677] | 191 | fout.close() |
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| 192 | |
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[64cf353] | 193 | return |
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| 194 | |
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[0f89116] | 195 | def copy_dummy_msg(self, filename_in, keynames, keyvalues, |
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| 196 | selectwhere=True, filemode='wb'): |
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[274f9ef] | 197 | '''Add the content of another input grib file to the objects file but |
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[64cf353] | 198 | only messages corresponding to keys/values passed to the function. |
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| 199 | The selectWhere switch decides if to copy the keys equal to (True) or |
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| 200 | different to (False) the keynames/keyvalues list passed to the function. |
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| 201 | |
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[274f9ef] | 202 | Parameters |
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| 203 | ---------- |
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| 204 | filename_in : :obj:`string` |
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| 205 | Filename of the input file to read the grib messages from. |
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| 206 | |
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[0f89116] | 207 | selectwhere : :obj:`boolean`, optional |
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[274f9ef] | 208 | Decides if to copy the keynames and values equal to (True) or |
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| 209 | different to (False) the keynames/keyvalues list passed to the |
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| 210 | function. Default is True. |
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[64cf353] | 211 | |
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[0f89116] | 212 | keynames : :obj:`list` of :obj:`string` |
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| 213 | List of keynames. |
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[64cf353] | 214 | |
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[0f89116] | 215 | keyvalues : :obj:`list` of :obj:`string` |
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| 216 | List of keyvalues. |
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[64cf353] | 217 | |
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[274f9ef] | 218 | filemode : :obj:`string`, optional |
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[c77630a] | 219 | Sets the mode for the output file. Default is "wb". |
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[64cf353] | 220 | |
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[274f9ef] | 221 | Return |
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| 222 | ------ |
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[64cf353] | 223 | |
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| 224 | ''' |
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[4ef5ba9] | 225 | from eccodes import (codes_grib_new_from_file, codes_is_defined, |
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| 226 | codes_get, codes_release, codes_write) |
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| 227 | |
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[268ee86] | 228 | if len(keynames) != len(keyvalues): |
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| 229 | raise Exception("Give a value for each keyname!") |
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[64cf353] | 230 | |
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[c77630a] | 231 | |
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[ff99eae] | 232 | fout = open(self.filenames, filemode) |
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[64cf353] | 233 | |
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[268ee86] | 234 | fields = 0 |
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| 235 | |
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[c77630a] | 236 | with open(filename_in, 'rb') as fin: |
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| 237 | if fields >= 1: |
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| 238 | fout.close() |
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| 239 | return |
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[d69b677] | 240 | |
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[c77630a] | 241 | gid = codes_grib_new_from_file(fin) |
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[64cf353] | 242 | |
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| 243 | select = True |
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| 244 | i = 0 |
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[d69b677] | 245 | for key in keynames: |
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[2e62398] | 246 | if not codes_is_defined(gid, key): |
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[64cf353] | 247 | raise Exception("Key was not defined") |
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| 248 | |
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[0f89116] | 249 | if selectwhere: |
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[64cf353] | 250 | select = (select and (str(keyvalues[i]) == |
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[2e62398] | 251 | str(codes_get(gid, key)))) |
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[d69b677] | 252 | else: |
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[64cf353] | 253 | select = (select and (str(keyvalues[i]) != |
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[2e62398] | 254 | str(codes_get(gid, key)))) |
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[64cf353] | 255 | i += 1 |
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| 256 | |
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[d69b677] | 257 | if select: |
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[268ee86] | 258 | fields = fields + 1 |
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[2e62398] | 259 | codes_write(gid, fout) |
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[64cf353] | 260 | |
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[2e62398] | 261 | codes_release(gid) |
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[64cf353] | 262 | |
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[d69b677] | 263 | fout.close() |
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| 264 | |
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[64cf353] | 265 | return |
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| 266 | |
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[0f89116] | 267 | def index(self, index_keys, index_file="my.idx"): |
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[274f9ef] | 268 | '''Create index file from a list of files if it does not exist or |
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| 269 | read an index file. |
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| 270 | |
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| 271 | Parameters |
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| 272 | ---------- |
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[0f89116] | 273 | index_keys: :obj:`list` of :obj:`string` |
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[274f9ef] | 274 | Contains the list of key parameter names from |
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| 275 | which the index is to be created. |
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| 276 | |
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| 277 | index_file: :obj:`string`, optional |
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| 278 | Filename where the indices are stored. |
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| 279 | Default is "my.idx". |
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| 280 | |
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| 281 | Return |
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| 282 | ------ |
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| 283 | iid: :obj:`integer` |
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| 284 | Grib index id. |
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[64cf353] | 285 | ''' |
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[4ef5ba9] | 286 | from eccodes import (codes_index_read, codes_index_new_from_file, |
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| 287 | codes_index_add_file, codes_index_write) |
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| 288 | |
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[2fb99de] | 289 | print("... index will be done") |
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[ff99eae] | 290 | iid = None |
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[64cf353] | 291 | |
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[ff99eae] | 292 | if os.path.exists(index_file): |
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[2e62398] | 293 | iid = codes_index_read(index_file) |
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[2fb99de] | 294 | print("Use existing index file: %s " % (index_file)) |
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[d69b677] | 295 | else: |
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[ff99eae] | 296 | for filename in self.filenames: |
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[2fb99de] | 297 | print("Inputfile: %s " % (filename)) |
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[ff99eae] | 298 | if iid is None: |
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[2e62398] | 299 | iid = codes_index_new_from_file(filename, index_keys) |
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[d69b677] | 300 | else: |
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[2e62398] | 301 | codes_index_add_file(iid, filename) |
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[d69b677] | 302 | |
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[ff99eae] | 303 | if iid is not None: |
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[2e62398] | 304 | codes_index_write(iid, index_file) |
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[d69b677] | 305 | |
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[2fb99de] | 306 | print('... index done') |
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[d69b677] | 307 | |
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[ff99eae] | 308 | return iid |
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