Mercurial > repos > pieterlukasse > prims_metabolomics

annotate query_mass_repos.py @ 62:9bd2597c8851 default tip

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author pieter.lukasse@wur.nl
date Fri, 06 Feb 2015 15:49:26 +0100
parents 60b53f2aa48a
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1 #!/usr/bin/env python
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2 # encoding: utf-8
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3 '''
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4 Module to query a set of accurate mass values detected by high-resolution mass spectrometers
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5 against various repositories/services such as METabolomics EXPlorer database or the
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6 MFSearcher service (http://webs2.kazusa.or.jp/mfsearcher/).
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7
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8 It will take the input file and for each record it will query the
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9 molecular mass in the selected repository/service. If one or more compounds are found
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10 then extra information regarding these compounds is added to the output file.
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11
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12 The output file is thus the input file enriched with information about
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13 related items found in the selected repository/service.
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14
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15 The service should implement the following interface:
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16
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17 http://service_url/mass?targetMs=500&margin=1&marginUnit=ppm&output=txth (txth means there is guaranteed to be a header line before the data)
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18
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19 The output should be tab separated and should contain the following columns (in this order)
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20 db-name molecular-formula dbe formula-weight id description
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22
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23 '''
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24 import csv
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25 import sys
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26 import fileinput
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27 import urllib2
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28 import time
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29 from collections import OrderedDict
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30
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31 __author__ = "Pieter Lukasse"
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32 __contact__ = "pieter.lukasse@wur.nl"
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33 __copyright__ = "Copyright, 2014, Plant Research International, WUR"
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34 __license__ = "Apache v2"
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35
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36 def _process_file(in_xsv, delim='\t'):
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37 '''
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38 Generic method to parse a tab-separated file returning a dictionary with named columns
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39 @param in_csv: input filename to be parsed
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40 '''
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41 data = list(csv.reader(open(in_xsv, 'rU'), delimiter=delim))
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42 return _process_data(data)
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43
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44 def _process_data(data):
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45
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46 header = data.pop(0)
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47 # Create dictionary with column name as key
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48 output = OrderedDict()
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49 for index in xrange(len(header)):
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50 output[header[index]] = [row[index] for row in data]
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51 return output
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52
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53
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54 def _query_and_add_data(input_data, molecular_mass_col, repository_dblink, error_margin, margin_unit):
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55
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56 '''
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57 This method will iterate over the record in the input_data and
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58 will enrich them with the related information found (if any) in the
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59 chosen repository/service
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60
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61 # TODO : could optimize this with multi-threading, see also nice example at http://stackoverflow.com/questions/2846653/python-multithreading-for-dummies
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62 '''
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63 merged = []
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64
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65 for i in xrange(len(input_data[input_data.keys()[0]])):
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66 # Get the record in same dictionary format as input_data, but containing
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67 # a value at each column instead of a list of all values of all records:
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68 input_data_record = OrderedDict(zip(input_data.keys(), [input_data[key][i] for key in input_data.keys()]))
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69
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70 # read the molecular mass :
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71 molecular_mass = input_data_record[molecular_mass_col]
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72
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73
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74 # search for related records in repository/service:
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75 data_found = None
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76 if molecular_mass != "":
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77 molecular_mass = float(molecular_mass)
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78
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79 # 1- search for data around this MM:
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80 query_link = repository_dblink + "/mass?targetMs=" + str(molecular_mass) + "&margin=" + str(error_margin) + "&marginUnit=" + margin_unit + "&output=txth"
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81
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82 data_found = _fire_query_and_return_dict(query_link + "&_format_result=tsv")
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83 data_type_found = "MM"
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84
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85
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86 if data_found == None:
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87 # If still nothing found, just add empty columns
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88 extra_cols = ['', '','','','','']
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89 else:
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90 # Add info found:
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91 extra_cols = _get_extra_info_and_link_cols(data_found, data_type_found, query_link)
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92
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93 # Take all data and merge it into a "flat"/simple array of values:
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94 field_values_list = _merge_data(input_data_record, extra_cols)
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95
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96 merged.append(field_values_list)
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97
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98 # return the merged/enriched records:
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99 return merged
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100
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101
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102 def _get_extra_info_and_link_cols(data_found, data_type_found, query_link):
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103 '''
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104 This method will go over the data found and will return a
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105 list with the following items:
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106 - details of hits found :
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107 db-name molecular-formula dbe formula-weight id description
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108 - Link that executes same query
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109
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110 '''
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111
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112 # set() makes a unique list:
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113 db_name_set = []
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114 molecular_formula_set = []
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115 id_set = []
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116 description_set = []
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117
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118
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119 if 'db-name' in data_found:
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120 db_name_set = set(data_found['db-name'])
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121 elif '# db-name' in data_found:
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122 db_name_set = set(data_found['# db-name'])
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123 if 'molecular-formula' in data_found:
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124 molecular_formula_set = set(data_found['molecular-formula'])
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125 if 'id' in data_found:
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126 id_set = set(data_found['id'])
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127 if 'description' in data_found:
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128 description_set = set(data_found['description'])
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129
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130 result = [data_type_found,
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131 _to_xsv(db_name_set),
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132 _to_xsv(molecular_formula_set),
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133 _to_xsv(id_set),
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134 _to_xsv(description_set),
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135 #To let Excel interpret as link, use e.g. =HYPERLINK("http://stackoverflow.com", "friendly name"):
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136 "=HYPERLINK(\""+ query_link + "\", \"Link to entries found in DB \")"]
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137 return result
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138
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139
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140 def _to_xsv(data_set):
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141 result = ""
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142 for item in data_set:
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143 result = result + str(item) + "|"
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144 return result
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145
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146
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147 def _fire_query_and_return_dict(url):
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148 '''
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149 This method will fire the query as a web-service call and
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150 return the results as a list of dictionary objects
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151 '''
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152
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153 try:
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154 data = urllib2.urlopen(url).read()
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155
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156 # transform to dictionary:
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157 result = []
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158 data_rows = data.split("\n")
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159
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160 # remove comment lines if any (only leave the one that has "molecular-formula" word in it...compatible with kazusa service):
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161 data_rows_to_remove = []
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162 for data_row in data_rows:
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163 if data_row == "" or (data_row[0] == '#' and "molecular-formula" not in data_row):
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164 data_rows_to_remove.append(data_row)
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165
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166 for data_row in data_rows_to_remove:
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167 data_rows.remove(data_row)
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168
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169 # check if there is any data in the response:
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170 if len(data_rows) <= 1 or data_rows[1].strip() == '':
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171 # means there is only the header row...so no hits:
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172 return None
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173
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174 for data_row in data_rows:
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175 if not data_row.strip() == '':
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176 row_as_list = _str_to_list(data_row, delimiter='\t')
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177 result.append(row_as_list)
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178
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179 # return result processed into a dict:
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180 return _process_data(result)
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181
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182 except urllib2.HTTPError, e:
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183 raise Exception( "HTTP error for URL: " + url + " : %s - " % e.code + e.reason)
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184 except urllib2.URLError, e:
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185 raise Exception( "Network error: %s" % e.reason.args[1] + ". Administrator: please check if service [" + url + "] is accessible from your Galaxy server. ")
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186
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187 def _str_to_list(data_row, delimiter='\t'):
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188 result = []
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189 for column in data_row.split(delimiter):
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190 result.append(column)
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191 return result
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192
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193
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194 # alternative: ?
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195 # s = requests.Session()
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196 # s.verify = False
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197 # #s.auth = (token01, token02)
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198 # resp = s.get(url, params={'name': 'anonymous'}, stream=True)
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199 # content = resp.content
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200 # # transform to dictionary:
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201
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202
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203
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204
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205 def _merge_data(input_data_record, extra_cols):
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206 '''
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207 Adds the extra information to the existing data record and returns
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208 the combined new record.
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209 '''
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210 record = []
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211 for column in input_data_record:
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212 record.append(input_data_record[column])
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213
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214
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215 # add extra columns
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216 for column in extra_cols:
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217 record.append(column)
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218
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219 return record
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220
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221
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222 def _save_data(data_rows, headers, out_csv):
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223 '''
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224 Writes tab-separated data to file
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225 @param data_rows: dictionary containing merged/enriched dataset
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226 @param out_csv: output csv file
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227 '''
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228
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229 # Open output file for writing
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230 outfile_single_handle = open(out_csv, 'wb')
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231 output_single_handle = csv.writer(outfile_single_handle, delimiter="\t")
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232
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233 # Write headers
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234 output_single_handle.writerow(headers)
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235
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236 # Write one line for each row
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237 for data_row in data_rows:
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238 output_single_handle.writerow(data_row)
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239
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240 def _get_repository_URL(repository_file):
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241 '''
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242 Read out and return the URL stored in the given file.
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243 '''
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244 file_input = fileinput.input(repository_file)
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245 try:
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246 for line in file_input:
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247 if line[0] != '#':
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248 # just return the first line that is not a comment line:
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249 return line
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250 finally:
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251 file_input.close()
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252
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253
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254 def main():
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255 '''
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256 Query main function
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257
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258 The input file can be any tabular file, as long as it contains a column for the molecular mass.
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259 This column is then used to query against the chosen repository/service Database.
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260 '''
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261 seconds_start = int(round(time.time()))
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262
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263 input_file = sys.argv[1]
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264 molecular_mass_col = sys.argv[2]
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265 repository_file = sys.argv[3]
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266 error_margin = float(sys.argv[4])
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267 margin_unit = sys.argv[5]
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268 output_result = sys.argv[6]
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269
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270 # Parse repository_file to find the URL to the service:
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271 repository_dblink = _get_repository_URL(repository_file)
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272
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273 # Parse tabular input file into dictionary/array:
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274 input_data = _process_file(input_file)
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275
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276 # Query data against repository :
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277 enriched_data = _query_and_add_data(input_data, molecular_mass_col, repository_dblink, error_margin, margin_unit)
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278 headers = input_data.keys() + ['SEARCH hits for ','SEARCH hits: db-names', 'SEARCH hits: molecular-formulas ',
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279 'SEARCH hits: ids','SEARCH hits: descriptions', 'Link to SEARCH hits'] #TODO - add min and max formula weigth columns
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280
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281 _save_data(enriched_data, headers, output_result)
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282
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283 seconds_end = int(round(time.time()))
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284 print "Took " + str(seconds_end - seconds_start) + " seconds"
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285
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286
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287
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288 if __name__ == '__main__':
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289 main()