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annotate python/url.py @ 809:b3f75f1361c5

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minor mostly formatting fixes
author Jeff Hammel <k0scist@gmail.com>
date Fri, 28 Oct 2016 17:27:32 -0700
parents f011ec45b8e8
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1 #!/usr/bin/env python
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2 # -*- coding: utf-8 -*-
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3
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4 """
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5 url manipulation
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6 """
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7
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8 import argparse
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9 import os
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10 import shutil
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11 import subprocess
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12 import sys
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13 import tempfile
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14 import urlparse
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15 import urllib2
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16
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17 __all__ = ['load', 'main']
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18 string = (str, unicode)
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19
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20 def ensure_dir(directory):
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21 """ensure `directory` is a directory"""
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22 if os.path.exists(directory):
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23 assert os.path.isdir(directory)
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24 return directory
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25 os.makedirs(directory)
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26 return directory
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27
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28 def isURL(url):
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29 return '://' in url
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30
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31 def read_s3(url):
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32 name = tempfile.mktemp()
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33 try:
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34 subprocess.check_output(['s3cmd', 'get', url, name])
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35 with open(name) as f:
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36 read = f.read()
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37 os.remove(name)
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38 return read
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39 finally:
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40 if os.path.exists(name):
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41 os.remove(name)
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42
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43 def read_http(url):
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44 return urllib2.urlopen(url).read()
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45
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46 def read_file(url):
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47 scheme = 'file://'
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48 if url.startswith(scheme):
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49 url = url[len(scheme):]
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50 return open(url).read()
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51
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52 loaders = {'s3': read_s3,
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53 'http': read_http,
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54 'https': read_http,
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55 'file': read_file
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56 }
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57
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58 def scheme(url):
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59 if '://' in url:
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60 parsed = urlparse.urlsplit(url)
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61 return parsed.scheme
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62 return 'file'
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63
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64 def parent(url):
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65 if '://' in url:
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66 return url.rsplit('/', 1)[0]
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67 else:
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68 # file
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69 return os.path.abspath(os.path.dirname(url))
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70
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71 def basename(url):
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72 if '://' in url:
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73 return url.rsplit('/', 1)[-1]
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74 else:
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75 # file
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76 return os.path.basename(url)
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77
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78 def loader(url):
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79 return loaders[scheme(url)]
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80
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81 def load(url):
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82 """returns the contents of a URL"""
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83 return loader(url)(url)
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84
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85 def get_file(src, dest):
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86 shutil.copy2(src, dest)
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87
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88 def get_s3(src, dest):
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89 subprocess.check_output(['s3cmd', 'get', src, dest])
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90
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91 def default_getter(src, dest):
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92 assert not os.path.isURL(dest)
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93 dirname = parent(dest)
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94 ensure_dir(dirname)
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95 with open(dest, 'w') as f:
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96 f.write(load(url))
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97
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98 getters = {'file': get_file,
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99 's3': get_s3
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100 }
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101
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102 def get(src, dest):
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103 """get a thing to a local file"""
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104 if os.path.isdir(dest):
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105 dest = os.path.join(dest, basename(src))
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106 return getters.get(scheme(src), default_getter)(src, dest)
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107
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108 def rel(base, path):
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109 """
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110 relative path to base
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111 otherwise, return None
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112 """
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113
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114 if path.startswith(base):
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115 return path[len(base):]
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116
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117 def main(args=sys.argv[1:]):
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118 """CLI"""
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119
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120 # parse command line
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121 parser = argparse.ArgumentParser(description=__doc__)
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122 parser.add_argument('url', help='URL to read')
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123 parser.add_argument('-o', '--output', dest='output',
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124 help="get to this location")
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125 options = parser.parse_args(args)
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126
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127 if options.output:
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128 # copy src to this location
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129 get(options.url, options.output)
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130 sys.exit()
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131
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132 # read location
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133 contents = load(options.url)
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134
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135 # output
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136 print (contents)
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137
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138 if __name__ == '__main__':
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139 main()