1 | #!/usr/local/bin/python |
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2 | |
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3 | import sys |
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4 | import re |
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5 | import os |
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6 | import random |
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7 | import copy |
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8 | |
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9 | from optparse import OptionParser, OptionValueError |
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10 | from federation.remote_service import service_caller |
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11 | from federation.service_error import service_error |
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12 | from federation import topdl |
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13 | |
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14 | class constraint: |
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15 | def __init__(self, name=None, required=False, accepts=None, provides=None, |
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16 | match=None): |
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17 | self.name = name |
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18 | self.required = required |
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19 | self.accepts = accepts or [] |
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20 | self.provides = provides or [] |
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21 | self.match = match |
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22 | |
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23 | def __str__(self): |
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24 | return "%s:%s:%s:%s" % (self.name, self.required, |
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25 | ",".join(self.provides), ",".join(self.accepts)) |
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26 | |
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27 | |
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28 | class ComposeOptionParser(OptionParser): |
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29 | """ |
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30 | This class encapsulates the options to this script in one place. It also |
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31 | holds the callback for the multifile choice. |
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32 | """ |
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33 | def __init__(self): |
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34 | OptionParser.__init__(self) |
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35 | self.add_option('--url', dest='url', default="http://localhost:13235", |
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36 | help='url of ns2 to topdl service') |
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37 | self.add_option('--certfile', dest='cert', default=None, |
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38 | help='Certificate to use as identity') |
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39 | self.add_option('--seed', dest='seed', type='int', default=None, |
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40 | help='Random number seed') |
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41 | self.add_option('--multifile', dest='files', default=[], type='string', |
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42 | action='callback', callback=self.multi_callback, |
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43 | help="Include file multiple times") |
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44 | self.add_option('--output', dest='outfile', default=None, |
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45 | help='Output file name') |
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46 | self.add_option('--format', dest='format', default="xml", |
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47 | help='Output file format') |
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48 | |
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49 | @staticmethod |
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50 | def multi_callback(option, opt_str, value, parser): |
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51 | """ |
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52 | Parse a --multifile command line option. The parameter is of the form |
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53 | filename,count. This splits the argument at the rightmost comma and |
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54 | inserts the filename, count tuple into the "files" option. It handles |
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55 | a couple error cases, too. |
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56 | """ |
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57 | idx = value.rfind(',') |
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58 | if idx != -1: |
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59 | try: |
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60 | parser.values.files.append((value[0:idx], int(value[idx+1:]))) |
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61 | except ValueError, e: |
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62 | raise OptionValueError( |
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63 | "Can't convert %s to int in multifile (%s)" % \ |
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64 | (value[idx+1:], value)) |
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65 | else: |
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66 | raise OptionValueError( |
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67 | "Bad format (need a comma) for multifile: %s" % value) |
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68 | |
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69 | def warn(msg): |
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70 | """ |
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71 | Exactly what you think. Print a message to stderr |
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72 | """ |
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73 | print >>sys.stderr, msg |
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74 | |
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75 | |
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76 | def make_new_name(names, prefix="name"): |
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77 | """ |
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78 | Generate an identifier not present in names by appending an integer to |
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79 | prefix. The new name is inserted into names and returned. |
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80 | """ |
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81 | i = 0 |
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82 | n = "%s%d" % (prefix,i) |
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83 | while n in names: |
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84 | i += 1 |
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85 | n = "%s%d" % (prefix,i) |
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86 | names.add(n) |
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87 | return n |
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88 | |
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89 | def add_interfaces(top, mark): |
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90 | """ |
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91 | Add unconnected interfaces to the nodes whose names are keys in the mark |
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92 | dict. As the interface is added change the name field of the contstraint |
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93 | in mark into a tuple containing the node name, interface name, and topology |
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94 | in which they reside. |
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95 | """ |
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96 | for e in top.elements: |
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97 | if e.name in mark: |
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98 | con = mark[e.name] |
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99 | ii = make_new_name(set([x.name for x in e.interface]), "inf") |
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100 | e.interface.append( |
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101 | topdl.Interface(substrate=[], name=ii, element=e)) |
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102 | con.name = (e.name, ii, top) |
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103 | |
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104 | def localize_names(top, names, marks): |
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105 | """ |
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106 | Take a topology and rename any substrates or elements that share a name |
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107 | with an existing computer or substrate. Keep the original name as a |
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108 | localized_name attribute. In addition, remap any constraints or interfaces |
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109 | that point to the old name over to the new one. Constraints are found in |
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110 | the marks dict, indexed by node name. Those constraints name attributes |
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111 | have already been converted to triples (node name, interface name, |
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112 | topology) so only the node name needs to be changed. |
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113 | """ |
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114 | sub_map = { } |
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115 | for s in top.substrates: |
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116 | s.set_attribute('localized_name', s.name) |
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117 | if s.name in names: |
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118 | sub_map[s.name] = n = make_new_name(names, "substrate") |
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119 | s.name = n |
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120 | else: |
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121 | names.add(s.name) |
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122 | |
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123 | for e in [ e for e in top.elements if isinstance(e, topdl.Computer)]: |
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124 | e.set_attribute('localized_name', e.name) |
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125 | if e.name in names: |
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126 | nn= make_new_name(names, "computer") |
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127 | if e.name in marks: |
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128 | n, i, t = marks[e.name].name |
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129 | marks[e.name].name = (nn, i, t) |
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130 | e.name = nn |
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131 | else: |
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132 | names.add(e.name) |
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133 | |
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134 | # Interface mapping. The list comprehension creates a list of |
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135 | # substrate names where each element in the list is replaced by the |
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136 | # entry in sub_map indexed by it if present and left alone otherwise. |
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137 | for i in e.interface: |
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138 | i.substrate = [ sub_map.get(ii, ii) for ii in i.substrate ] |
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139 | |
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140 | def meet_constraints(candidates, provides, accepts): |
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141 | """ |
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142 | Try to meet all the constraints in candidates using the information in the |
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143 | provides and accepts dicts (which index constraints that provide or accept |
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144 | the given attribute). A constraint is met if it can be matched with another |
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145 | constraint that provides an attribute that the first constraint accepts. |
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146 | Only one match per pair is allowed, and we always prefer matching a |
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147 | required constraint to an unreqired one. If all the candidates can be |
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148 | matches, return True and return False otherwise. |
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149 | """ |
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150 | got_all = True |
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151 | for c in candidates: |
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152 | if not c.match: |
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153 | match = None |
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154 | for a in c.accepts: |
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155 | for can in provides.get(a,[]): |
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156 | # A constraint cannot satisfy itself, nor do we allow loops |
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157 | # within the same topology. This also excludes matched |
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158 | # constraints. |
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159 | if can.name != c.name and can.name[2] != c.name[2] and \ |
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160 | not can.match: |
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161 | match = can |
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162 | # Within providers, prefer matches against required |
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163 | # composition points |
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164 | if can.required: |
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165 | break |
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166 | # Within acceptance categories, prefer matches against required |
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167 | # composition points |
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168 | if match and match.required: |
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169 | break |
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170 | |
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171 | # Done checking all possible matches. |
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172 | if match: |
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173 | match.match = c |
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174 | c.match = match |
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175 | else: |
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176 | got_all = False |
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177 | return got_all |
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178 | |
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179 | def randomize_constraint_order(indexes): |
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180 | """ |
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181 | Randomly reorder the lists of constraints that provides and accepts hold. |
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182 | """ |
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183 | if not isinstance(indexes, tuple): |
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184 | indexes = (indexes,) |
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185 | |
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186 | for idx in indexes: |
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187 | for k in idx.keys(): |
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188 | random.shuffle(idx[k]) |
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189 | |
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190 | def remote_ns2topdl(uri, desc, cert): |
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191 | """ |
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192 | Call a remote service to convert the ns2 to topdl (and in fact all the way |
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193 | to a topdl.Topology. |
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194 | """ |
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195 | |
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196 | req = { 'description' : { 'ns2description': desc }, } |
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197 | |
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198 | r = service_caller('Ns2Topdl')(uri, req, cert) |
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199 | |
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200 | if r.has_key('Ns2TopdlResponseBody'): |
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201 | r = r['Ns2TopdlResponseBody'] |
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202 | ed = r.get('experimentdescription', None) |
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203 | if 'topdldescription' in ed: |
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204 | return topdl.Topology(**ed['topdldescription']) |
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205 | else: |
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206 | return None |
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207 | else: |
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208 | return None |
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209 | |
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210 | def connect_composition_points(top, contraints, names): |
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211 | """ |
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212 | top is a topology containing copies of all the topologies represented in |
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213 | the contsraints, flattened into one name space. This routine inserts the |
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214 | additional substrates required to interconnect the topology as described by |
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215 | the constraints. After the links are made, unused connection points are |
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216 | purged. |
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217 | """ |
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218 | done = set() |
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219 | for c in constraints: |
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220 | if c not in done and c.match: |
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221 | # c is an unprocessed matched constraint. Create a substrate |
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222 | # and attach it to the interfaces named by c and c.match. |
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223 | sn = make_new_name(names, "sub") |
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224 | s = topdl.Substrate(name=sn) |
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225 | connected = 0 |
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226 | # Walk through all the computers in the topology |
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227 | for e in [ e for e in top.elements \ |
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228 | if isinstance(e, topdl.Computer)]: |
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229 | # if the computer matches the computer and interface name in |
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230 | # either c or c.match, connect it. Once both computers have |
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231 | # been found and connected, exit the loop walking through all |
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232 | # computers. |
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233 | for comp, inf in (c.name[0:2], c.match.name[0:2]): |
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234 | if e.name == comp: |
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235 | for i in e.interface: |
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236 | if i.name == inf: |
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237 | i.substrate.append(sn) |
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238 | connected += 1 |
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239 | break |
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240 | break |
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241 | # Connected both, so add the substrate to the topology |
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242 | if connected == 2: |
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243 | top.substrates.append(s) |
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244 | break |
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245 | # c and c.match have been processed, so add them to the done set |
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246 | done.add(c) |
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247 | done.add(c.match) |
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248 | |
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249 | # All interfaces with matched constraints have been connected. Cull any |
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250 | # interfaces unassigned to a substrate |
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251 | for e in [ e for e in top.elements if isinstance(e, topdl.Computer)]: |
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252 | if any([ not i.substrate for i in e.interface]): |
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253 | e.interface = [ i for i in e.interface if i.substrate ] |
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254 | |
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255 | top.incorporate_elements() |
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256 | |
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257 | def import_ns2_constraints(contents): |
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258 | """ |
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259 | Contents is a list containing the lines of an annotated ns2 file. This |
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260 | routine extracts the constraint comment lines and convertes them into |
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261 | constraints in the namespace of the tcl experiment, as well as inserting |
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262 | them in the accepts and provides indices. |
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263 | |
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264 | Constraints are given in lines of the form |
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265 | name:required:provides:accepts |
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266 | where name is the name of the node in the current topology, if the second |
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267 | field is "required" this is a required constraint, a list of attributes |
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268 | that this connection point provides and a list that it accepts. The |
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269 | provides and accepts lists are comma-separated. The constraint is added to |
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270 | the marks dict under the name key and that dict is returned. |
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271 | """ |
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272 | |
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273 | const_re = re.compile("\s*#\s*COMPOSITION:\s*([^:]+:[^:]+:.*)") |
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274 | |
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275 | marks = { } |
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276 | for l in contents: |
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277 | m = const_re.search(l) |
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278 | if m: |
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279 | exp = re.sub('\s', '', m.group(1)) |
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280 | nn, r, p, a = exp.split(":") |
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281 | if nn.find('(') != -1: |
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282 | # Convert array references into topdl names |
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283 | nn = re.sub('\\((\\d)\\)', '-\\1', nn) |
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284 | p = p.split(",") |
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285 | a = a.split(",") |
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286 | c = constraint(name=nn, required=(r == 'required'), |
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287 | provides=p, accepts=a) |
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288 | marks[nn] = c |
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289 | return marks |
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290 | |
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291 | def add_constraint_attributes(top, marks): |
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292 | """ |
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293 | Take the constraints in marks and add attributes representing them to the |
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294 | nodes in top. |
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295 | """ |
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296 | for e in [e for e in top.elements if isinstance(e, topdl.Computer)]: |
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297 | if e.name in marks and not e.get_attribute('composition_point'): |
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298 | c = marks[e.name] |
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299 | e.set_attribute('composition_point', 'true') |
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300 | e.set_attribute('required', '%s' % c.required) |
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301 | e.set_attribute('provides', ",".join(c.provides)) |
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302 | e.set_attribute('accepts', ",".join(c.accepts)) |
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303 | |
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304 | def remove_constraint_attributes(top, marks): |
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305 | """ |
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306 | Remove constraint attributes that match the ones in the dict from the |
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307 | topology. |
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308 | """ |
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309 | for e in [e for e in top.elements \ |
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310 | if isinstance(e, topdl.Computer) and e.name in marks]: |
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311 | e.remove_attribute('composition_point') |
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312 | e.remove_attribute('required') |
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313 | e.remove_attribute('provides') |
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314 | e.remove_attribute('accepts') |
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315 | |
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316 | def import_ns2_component(fn): |
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317 | """ |
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318 | Pull a composition component in from an ns2 description. The Constraints |
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319 | are parsed from the comments using import_ns2_constraints and the topology |
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320 | is created using a call to a fedd exporting the Ns2Topdl function. A |
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321 | topdl.Topology object rempresenting the component's topology and a dict |
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322 | mapping constraints from the components names to the conttraints is |
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323 | returned. If either the file read or the conversion fails, appropriate |
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324 | Exceptions are thrown. |
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325 | """ |
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326 | f = open(fn, "r") |
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327 | contents = [ l for l in f ] |
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328 | |
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329 | marks = import_ns2_constraints(contents) |
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330 | top = remote_ns2topdl(opts.url, "".join(contents), cert) |
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331 | if not top: |
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332 | raise RuntimeError("Cannot create topology from: %s" % fn) |
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333 | add_constraint_attributes(top, marks) |
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334 | |
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335 | return (top, marks) |
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336 | |
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337 | def import_topdl_component(fn): |
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338 | """ |
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339 | Pull a component in from a topdl description. The topology generation is |
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340 | straightforward and the constraints are pulled from the attributes of |
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341 | Computer nodes in the experiment. The compisition_point attribute being |
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342 | true marks a node as a composition point. The required, provides and |
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343 | accepts attributes map directly into those constraint fields. The dict of |
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344 | constraints and the topology are returned. |
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345 | """ |
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346 | top = topdl.topology_from_xml(filename=fn, top='experiment') |
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347 | marks = { } |
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348 | for e in [ e for e in top.elements if isinstance(e, topdl.Computer)]: |
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349 | if e.get_attribute('composition_point'): |
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350 | r = e.get_attribute('required') or 'false' |
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351 | a = e.get_attribute('accepts') |
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352 | p = e.get_attribute('provides') |
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353 | if a and p: |
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354 | c = constraint(name=e.name, required=(r == 'required'), |
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355 | provides=p.split(','), accepts=a.split(',')) |
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356 | marks[e.name] = c |
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357 | return (top, marks) |
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358 | |
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359 | def index_constraints(constraints, provides, accepts): |
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360 | """ |
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361 | Add constraints to the provides and accepts indices based on the attributes |
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362 | of the contstraints. |
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363 | """ |
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364 | for c in constraints: |
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365 | for attr, dict in ((c.provides, provides), (c.accepts, accepts)): |
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366 | for a in attr: |
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367 | if a not in dict: dict[a] = [c] |
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368 | else: dict[a].append(c) |
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369 | |
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370 | def get_suffix(fn): |
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371 | """ |
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372 | We get filename suffixes a couple places. It;s worth using the same code. |
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373 | This gets the shortest . separated suffix from a filename, or None. |
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374 | """ |
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375 | idx = fn.rfind('.') |
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376 | if idx != -1: return fn[idx+1:] |
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377 | else: return None |
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378 | |
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379 | |
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380 | def output_composition(top, constraints, outfile=None, format=None): |
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381 | """ |
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382 | Output the composition to the file named by outfile (if any) in the format |
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383 | given by format if any. If both are None, output to stdout in topdl |
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384 | """ |
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385 | def topdl_out(f, top, constraints): |
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386 | """ |
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387 | Output into topdl. Just call the topdl output, as the constraint |
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388 | attributes should be in the topology. |
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389 | """ |
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390 | print >>f, topdl.topology_to_xml(comp, top='experiment') |
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391 | |
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392 | def ns2_out(f, top, constraints): |
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393 | """ |
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394 | Reformat the constraint data structures into ns2 constraint comments |
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395 | and output the ns2 using the topdl routine. |
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396 | """ |
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397 | # Inner routines |
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398 | # Deal with the possibility that the single string name is still in the |
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399 | # constraint. |
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400 | def name_format(n): |
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401 | if isinstance(n, tuple): return n[0] |
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402 | else: return n |
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403 | |
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404 | |
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405 | # Format the required field back into a string. (ns2_out inner |
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406 | def required_format(x): |
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407 | if x: return "required" |
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408 | else: return "optional" |
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409 | |
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410 | # ns2_out main line |
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411 | for c in constraints: |
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412 | print >>f, "# COMPOSITION: %s:%s:%s:%s" % ( |
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413 | topdl.to_tcl_name(name_format(c.name)), |
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414 | required_format(c.required), ",".join(c.provides), |
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415 | ",".join(c.accepts)) |
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416 | print >>f, topdl.topology_to_ns2(top) |
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417 | |
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418 | # Info to map from format to output routine. |
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419 | exporters = { |
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420 | 'xml':topdl_out, 'topdl':topdl_out, |
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421 | 'tcl': ns2_out, 'ns': ns2_out, |
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422 | } |
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423 | |
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424 | if format: |
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425 | # Explicit format set, use it |
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426 | if format in exporters: |
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427 | exporter = exporters[format] |
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428 | else: |
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429 | raise RuntimeError("Unknown format %s" % format) |
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430 | elif outfile: |
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431 | # Determine the format from the suffix (if any) |
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432 | s = get_suffix(outfile) |
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433 | if s and s in exporters: |
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434 | exporter = exporters[s] |
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435 | else: |
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436 | raise RuntimeError("Unknown format (suffix) %s" % outfile) |
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437 | else: |
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438 | # Both outfile and format are empty |
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439 | exporter = topdl_out |
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440 | |
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441 | # The actual output. Open the file, if any, and call the exporter |
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442 | if outfile: f = open(outfile, "w") |
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443 | else: f = sys.stdout |
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444 | exporter(f, top, constraints) |
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445 | if outfile: f.close() |
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446 | |
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447 | def import_components(files): |
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448 | """ |
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449 | Pull in the components. The input is a sequence of tuples where each tuple |
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450 | includes the name of the file to pull the component from and the number of |
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451 | copies to make of it. The routine to read a file is picked by its suffix. |
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452 | On completion, a tuple containing the number of components successfully |
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453 | read, a list of the topologies, a set of names in use accross all |
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454 | topologies (for inserting later names), the constraints extracted, and |
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455 | indexes mapping the attribute provices and accepted tinto the lists of |
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456 | constraints that provide or accept them is returned. |
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457 | """ |
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458 | importers = { |
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459 | 'tcl': import_ns2_component, |
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460 | 'ns': import_ns2_component, |
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461 | 'xml':import_topdl_component, |
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462 | 'topdl':import_topdl_component, |
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463 | } |
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464 | names = set() |
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465 | constraints = [ ] |
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466 | provides = { } |
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467 | accepts = { } |
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468 | components = 0 |
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469 | topos = [ ] |
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470 | |
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471 | for fn, cnt in files: |
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472 | top = None |
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473 | try: |
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474 | s = get_suffix(fn) |
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475 | if s and s in importers: |
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476 | top, marks = importers[s](fn) |
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477 | else: |
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478 | warn("Unknown suffix on file %s. Ignored" % fn) |
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479 | continue |
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480 | except service_error, e: |
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481 | warn("Remote error on %s: %s" % (fn, e)) |
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482 | continue |
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483 | except EnvironmentError, e: |
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484 | warn("Error on %s: %s" % (fn, e)) |
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485 | continue |
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486 | |
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487 | # Parsed the component and sonctraints, now work through the rest of |
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488 | # the pre-processing. We do this once per copy of the component |
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489 | # requested, cloning topologies and constraints each time. |
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490 | for i in range(0, cnt): |
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491 | components += 1 |
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492 | t = top.clone() |
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493 | m = copy.deepcopy(marks) |
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494 | index_constraints(m.values(), provides, accepts) |
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495 | add_interfaces(t, m) |
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496 | localize_names(t, names, m) |
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497 | t.incorporate_elements() |
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498 | constraints.extend(m.values()) |
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499 | topos.append(t) |
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500 | |
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501 | return (components, topos, names, constraints, provides, accepts) |
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502 | |
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503 | # Main line begins |
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504 | parser = ComposeOptionParser() |
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505 | |
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506 | opts, args = parser.parse_args() |
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507 | |
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508 | if opts.cert: |
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509 | cert = opts.cert |
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510 | elif os.access(os.path.expanduser("~/.ssl/emulab.pem"), os.R_OK): |
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511 | cert = os.path.expanduser("~/.ssl/emulab.pem") |
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512 | else: |
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513 | cert = None |
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514 | |
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515 | random.seed(opts.seed) |
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516 | |
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517 | files = opts.files |
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518 | files.extend([ (a, 1) for a in args]) |
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519 | |
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520 | # Pull 'em in. |
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521 | components, topos, names, constraints, provides, accepts = \ |
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522 | import_components(files) |
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523 | |
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524 | # Let the user know if they messed up on specifying constraints. |
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525 | if any([ not isinstance(c.name, tuple) for c in constraints]): |
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526 | warn("nodes not found for constraints on %s" % \ |
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527 | ",".join([ c.name for c in constraints \ |
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528 | if isinstance(c.name, basestring)])) |
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529 | constraints = [ c for c in constraints if isinstance(c.name, tuple )] |
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530 | |
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531 | # If more than one component was given, actually do the composition, otherwise |
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532 | # this is probably a format conversion. |
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533 | if components > 1: |
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534 | # Mix up the constraint indexes |
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535 | randomize_constraint_order((provides, accepts)) |
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536 | |
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537 | # Now the various components live in the same namespace and are marked with |
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538 | # their composition requirements. |
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539 | |
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540 | if not meet_constraints([c for c in constraints if c.required], |
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541 | provides, accepts): |
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542 | sys.exit("Could not meet all required constraints") |
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543 | |
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544 | meet_constraints([ c for c in constraints if not c.match ], |
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545 | provides, accepts) |
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546 | |
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547 | # Make a topology containing all elements and substrates from components |
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548 | # that had matches. |
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549 | comp = topdl.Topology() |
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550 | for t in set([ c.name[2] for c in constraints if c.match]): |
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551 | comp.elements.extend([e.clone() for e in t.elements]) |
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552 | comp.substrates.extend([s.clone() for s in t.substrates]) |
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553 | |
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554 | # Add substrates and connections corresponding to composition points |
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555 | connect_composition_points(comp, constraints, names) |
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556 | |
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557 | # Remove composition attributes for satisfied constraints |
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558 | remove_constraint_attributes(comp, dict( |
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559 | [(c.name[0], c) for c in constraints if c.match])) |
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560 | elif topos == 1: |
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561 | comp = topos[0] |
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562 | else: |
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563 | sys.exit("Did not read any components.") |
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564 | |
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565 | # Put out the composition with only the unmatched constriaints |
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566 | output_composition(comp, [c for c in constraints if not c.match], |
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567 | opts.outfile, opts.format) |
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