1 | #!/usr/local/bin/python |
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2 | |
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3 | import os,sys |
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4 | import re |
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5 | import string |
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6 | import copy |
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7 | import pickle |
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8 | import logging |
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9 | import time |
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10 | |
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11 | from threading import Thread, Lock |
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12 | from subprocess import Popen, call, PIPE, STDOUT |
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13 | from access import access_base |
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14 | from legacy_access import legacy_access |
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15 | |
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16 | from util import * |
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17 | from allocate_project import allocate_project_local, allocate_project_remote |
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18 | from fedid import fedid, generate_fedid |
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19 | from authorizer import authorizer, abac_authorizer |
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20 | from service_error import service_error |
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21 | from remote_service import xmlrpc_handler, soap_handler, service_caller |
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22 | |
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23 | import httplib |
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24 | import tempfile |
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25 | from urlparse import urlparse |
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26 | |
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27 | import topdl |
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28 | import list_log |
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29 | import proxy_emulab_segment |
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30 | import local_emulab_segment |
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31 | |
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32 | |
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33 | # Make log messages disappear if noone configures a fedd logger |
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34 | class nullHandler(logging.Handler): |
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35 | def emit(self, record): pass |
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36 | |
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37 | fl = logging.getLogger("fedd.access") |
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38 | fl.addHandler(nullHandler()) |
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39 | |
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40 | class access(access_base, legacy_access): |
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41 | """ |
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42 | The implementation of access control based on mapping users to projects. |
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43 | |
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44 | Users can be mapped to existing projects or have projects created |
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45 | dynamically. This implements both direct requests and proxies. |
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46 | """ |
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47 | |
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48 | def __init__(self, config=None, auth=None): |
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49 | """ |
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50 | Initializer. Pulls parameters out of the ConfigParser's access section. |
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51 | """ |
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52 | access_base.__init__(self, config, auth) |
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53 | |
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54 | self.cli_dir = config.get("access", "cli_dir") |
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55 | self.axis2_home = config.get("access", "axis2_home") |
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56 | self.idc_url = config.get("access", "idc") |
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57 | self.domain = config.get("access", "domain") |
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58 | self.duration = config.getint("access", "duration", 120) |
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59 | |
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60 | self.access = { } |
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61 | if not (self.cli_dir and self.axis2_home and self.idc_url): |
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62 | self.log.error("Must specify all of cli_dir, axis2_home, " +\ |
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63 | "idc in the [access] section of the configuration") |
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64 | |
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65 | # authorization information |
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66 | self.auth_type = config.get('access', 'auth_type') \ |
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67 | or 'legacy' |
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68 | self.auth_dir = config.get('access', 'auth_dir') |
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69 | accessdb = config.get("access", "accessdb") |
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70 | # initialize the authorization system |
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71 | if self.auth_type == 'legacy': |
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72 | self.access = { } |
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73 | if accessdb: |
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74 | self.legacy_read_access(accessdb, self.make_repo) |
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75 | # Add the ownership attributes to the authorizer. Note that the |
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76 | # indices of the allocation dict are strings, but the attributes are |
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77 | # fedids, so there is a conversion. |
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78 | self.state_lock.acquire() |
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79 | for k in self.state.keys(): |
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80 | for o in self.state[k].get('owners', []): |
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81 | self.auth.set_attribute(o, fedid(hexstr=k)) |
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82 | self.auth.set_attribute(fedid(hexstr=k),fedid(hexstr=k)) |
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83 | self.state_lock.release() |
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84 | self.lookup_access = self.legacy_lookup_access_base |
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85 | elif self.auth_type == 'abac': |
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86 | self.auth = abac_authorizer(load=self.auth_dir) |
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87 | self.access = [ ] |
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88 | if accessdb: |
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89 | self.read_access(accessdb, self.make_repo) |
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90 | else: |
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91 | raise service_error(service_error.internal, |
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92 | "Unknown auth_type: %s" % self.auth_type) |
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93 | |
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94 | self.call_GetValue= service_caller('GetValue') |
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95 | self.call_SetValue= service_caller('SetValue') |
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96 | |
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97 | self.soap_services = {\ |
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98 | 'RequestAccess': soap_handler("RequestAccess", self.RequestAccess), |
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99 | 'ReleaseAccess': soap_handler("ReleaseAccess", self.ReleaseAccess), |
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100 | 'StartSegment': soap_handler("StartSegment", self.StartSegment), |
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101 | 'TerminateSegment': soap_handler("TerminateSegment", |
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102 | self.TerminateSegment), |
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103 | } |
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104 | self.xmlrpc_services = {\ |
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105 | 'RequestAccess': xmlrpc_handler('RequestAccess', |
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106 | self.RequestAccess), |
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107 | 'ReleaseAccess': xmlrpc_handler('ReleaseAccess', |
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108 | self.ReleaseAccess), |
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109 | 'StartSegment': xmlrpc_handler("StartSegment", self.StartSegment), |
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110 | 'TerminateSegment': xmlrpc_handler('TerminateSegment', |
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111 | self.TerminateSegment), |
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112 | } |
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113 | |
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114 | @staticmethod |
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115 | def make_repo(s): |
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116 | """ |
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117 | Get the repo directory from an access line. This is removing the () |
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118 | from the string. |
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119 | """ |
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120 | rv = s.strip() |
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121 | if rv.startswith('(') and rv.endswith(')'): return rv[1:-1] |
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122 | else: raise self.parse_error("Repo should be in parens"); |
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123 | |
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124 | # RequestAccess and ReleaseAccess come from the base class |
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125 | |
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126 | def extract_parameters(self, top): |
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127 | """ |
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128 | DRAGON currently supports a fixed capacity link between two endpoints. |
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129 | Those endpoints may specify a VPN (or list or range) to use. This |
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130 | extracts the DRAGON endpoints and vpn preferences from the segments (as |
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131 | attributes) and the capacity of the connection as given by the |
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132 | substrate. The two endpoints VLAN choices are intersected to get set |
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133 | of VLANs that are acceptable (no VLAN requiremnets means any is |
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134 | acceptable). |
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135 | """ |
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136 | segments = filter(lambda x: isinstance(x, topdl.Segment), top.elements) |
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137 | |
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138 | if len(segments) != 2 or len(top.substrates) != 1: |
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139 | raise service_error(service_error.req, |
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140 | "Requests to DRAGON must have exactlty two segments " +\ |
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141 | "and one substrate") |
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142 | |
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143 | ends = [ ] |
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144 | for s in segments: |
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145 | ep = s.get_attribute('dragon_endpoint') |
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146 | if not ep: |
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147 | raise service_error(service_error.req, |
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148 | "Missing DRAGON endpoint for %s" % s.id) |
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149 | v = s.get_attribute('vlans') |
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150 | vlans = None |
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151 | vset = set() |
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152 | # the vlans can be a single integer, a comma separated list or a |
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153 | # comma separated lists of dashed ranges. E.g 100 or 100,300 or |
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154 | # 100,300-305,400 |
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155 | if v: |
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156 | if v.count(",") > 0 : |
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157 | vl = [ x.strip() for x in v.split(",") ] |
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158 | else: |
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159 | vl = [ v ] |
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160 | for v in vl: |
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161 | try: |
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162 | if v.count("-")> 0: |
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163 | f, t = v.split("-", 1) |
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164 | for i in range(int(f), int(t)+1): |
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165 | vset.add(i) |
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166 | else: |
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167 | vset.add(int(v)) |
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168 | except ValueError: |
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169 | raise service_error(service_error.req, |
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170 | "VLAN tags must be integers (%s)" %s.name) |
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171 | if len(vset) > 0: |
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172 | if vlans: vlans &= vest |
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173 | else: vlans = vset |
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174 | ends.append(ep) |
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175 | |
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176 | |
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177 | sub = top.substrates[0] |
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178 | if sub.capacity: |
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179 | cap = int(sub.capacity.rate / 1000.0) |
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180 | if cap < 1: cap = 1 |
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181 | else: |
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182 | cap = 100 |
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183 | |
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184 | |
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185 | # DRAGON's command line tool barfs if the source (ends[0]) is not in |
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186 | # the domain controlled by the IDC. This code ensures this situation. |
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187 | if self.domain and not ends[0].endswith(self.domain): |
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188 | hold = ends[0] |
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189 | for i, e in enumerate(ends): |
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190 | if i == 0: continue |
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191 | if e.endswith(self.domain): |
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192 | ends[0] = e |
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193 | ends[i] = hold |
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194 | break |
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195 | else: |
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196 | raise service_error(service_error.req, |
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197 | "No endpoint in my domain") |
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198 | |
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199 | |
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200 | return cap, ends[0], ends[1], vlans |
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201 | |
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202 | def oscars_create_vpn(self, repo, fr, to, cap, v, start, end, log): |
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203 | |
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204 | gri_re = re.compile("GRI:\s*(.*)", re.IGNORECASE) |
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205 | status_re = re.compile("Status:\s*(.*)", re.IGNORECASE) |
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206 | |
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207 | cmd = ['env', 'AXIS2_HOME=%s' % self.axis2_home, './run.sh', |
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208 | 'createReservation', '-repo', repo , '-url', self.idc_url, |
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209 | '-l2source', fr, '-l2dest', to, '-bwidth', "%s" % cap, |
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210 | '-vlan', "%s" % v, '-desc', 'fedd created connection', |
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211 | '-pathsetup', 'timer-automatic', '-start', "%d" % int(start), |
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212 | '-end', "%d" % int(end)] |
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213 | log.debug("[start_segment]: %s" % " ".join(cmd)) |
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214 | if not self.create_debug: |
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215 | p = Popen(cmd, cwd=self.cli_dir, stdout=PIPE, stderr=STDOUT, |
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216 | close_fds=True) |
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217 | for line in p.stdout: |
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218 | m = status_re.match(line) |
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219 | if m: |
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220 | status = m.group(1) |
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221 | continue |
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222 | m = gri_re.match(line) |
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223 | if m: |
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224 | gri = m.group(1) |
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225 | continue |
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226 | rv = p.wait() |
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227 | else: |
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228 | rv = 0 |
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229 | status = 'ACCEPTED' |
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230 | gri = 'debug_gri' |
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231 | |
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232 | return (rv, status, gri) |
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233 | |
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234 | def oscars_query_vpn(self, repo, gri, v, log): |
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235 | """ |
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236 | Call the oscars query command from the command line and parse out the |
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237 | data to see if the current request succeeded. This is a lot of fiddly |
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238 | code to do a pretty simple thing. |
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239 | """ |
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240 | status_re = re.compile("Status:\s*(.*)", re.IGNORECASE) |
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241 | source_re = re.compile("Source\s+Endpoint:\s*(.*)", re.IGNORECASE) |
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242 | dest_re = re.compile("Destination\s+Endpoint:\s*(.*)", re.IGNORECASE) |
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243 | path_re = re.compile("Path:") |
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244 | |
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245 | cmd = ['env', 'AXIS2_HOME=%s' % self.axis2_home, './run.sh', |
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246 | 'query', '-repo', repo , '-url', self.idc_url, '-gri', gri] |
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247 | log.debug("[start_segment]: %s" % " ".join(cmd)) |
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248 | if not self.create_debug: |
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249 | # Really do the query |
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250 | p = Popen(cmd, cwd=self.cli_dir, stdout=PIPE, stderr=STDOUT, |
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251 | close_fds=True) |
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252 | in_path = False |
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253 | vpn1 = None |
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254 | vpn2 = None |
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255 | src = None |
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256 | dest = None |
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257 | for line in p.stdout: |
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258 | if not in_path: |
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259 | m = status_re.match(line) |
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260 | if m: |
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261 | status = m.group(1) |
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262 | continue |
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263 | m = source_re.match(line) |
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264 | if m: |
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265 | src = m.group(1) |
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266 | continue |
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267 | m = dest_re.match(line) |
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268 | if m: |
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269 | dest = m.group(1) |
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270 | continue |
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271 | m = path_re.match(line) |
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272 | if m: |
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273 | in_path = True |
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274 | if src and dest: |
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275 | vpn1_re = re.compile( |
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276 | "\s*%s,\s*\w+\s*,\s*(\d+)" % \ |
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277 | src.replace("*", "\*")) |
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278 | vpn2_re = re.compile( |
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279 | "\s*%s,\s*\w+\s*,\s*(\d+)" % \ |
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280 | dest.replace("*", "\*")) |
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281 | else: |
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282 | raise service_error(service_error.internal, |
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283 | "Strange output from query") |
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284 | else: |
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285 | m = vpn1_re.match(line) |
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286 | if m: |
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287 | vpn1 = m.group(1) |
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288 | continue |
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289 | m = vpn2_re.match(line) |
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290 | if m: |
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291 | vpn2 = m.group(1) |
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292 | continue |
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293 | rv = p.wait() |
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294 | # Make sure that OSCARS did what we expected. |
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295 | if vpn1 == vpn2: |
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296 | if v is not None: |
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297 | if int(vpn1) == v: |
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298 | vlan_no = int(v) |
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299 | else: |
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300 | raise service_error(service_error.federant, |
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301 | "Unexpected vlan assignment") |
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302 | else: |
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303 | vlan_no = int(v or 0) |
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304 | else: |
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305 | raise service_error(service_error.internal, |
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306 | "Different VPNs on DRAGON ends") |
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307 | log.debug("Status: %s" % status or "none") |
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308 | else: |
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309 | rv = 0 |
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310 | status = 'ACTIVE' |
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311 | vlan_no = int(v or 1) |
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312 | |
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313 | return (rv, status, vlan_no) |
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314 | |
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315 | |
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316 | |
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317 | def start_segment(self, repo, fr, to, cap, vpns=None, start=None, end=None, |
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318 | log=None): |
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319 | """ |
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320 | Do the actual work of creating the dragon connecton. |
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321 | """ |
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322 | waiting_states = ('ACCEPTED', 'INSETUP', 'INCREATE', 'PENDING') |
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323 | if not log: log = self.log |
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324 | |
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325 | if not vpns: |
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326 | vpns = [ None, None, None, None, None] |
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327 | |
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328 | if not start: |
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329 | start = time.time() |
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330 | if not end: |
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331 | end = start + self.duration *60 |
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332 | |
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333 | |
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334 | status = None |
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335 | gri = None |
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336 | rv = None |
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337 | vlan_no = None |
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338 | for v in vpns: |
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339 | rv, status, gri = self.oscars_create_vpn(repo, fr, to, cap, v, |
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340 | start, end, log) |
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341 | # Reservation in progress. Poll the IDC until we know the outcome |
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342 | while status in waiting_states: |
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343 | rv, status, vlan_no = self.oscars_query_vpn(repo, gri, v, log) |
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344 | if status in waiting_states: |
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345 | time.sleep(45) |
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346 | if status in ('ACTIVE', 'FINISHED', 'CANCELLED'): |
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347 | break |
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348 | |
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349 | if (rv == 0 and gri and vlan_no and status == 'ACTIVE'): |
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350 | self.log.debug("made reservation %s %s" % (gri, vlan_no)) |
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351 | return gri, vlan_no |
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352 | else: |
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353 | raise service_error(service_error.federant, |
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354 | "Cannot make reservation") |
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355 | |
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356 | def stop_segment(self, repo, gri, log=None): |
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357 | """ |
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358 | Terminate the reservation. |
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359 | """ |
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360 | if not log: log = self.log |
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361 | cmd = ['env', 'AXIS2_HOME=%s' % self.axis2_home, './run.sh', |
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362 | 'cancel', '-repo', repo , '-url', self.idc_url, '-gri', gri] |
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363 | |
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364 | |
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365 | self.log.debug("[stop_segment]: %s" % " ".join(cmd)) |
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366 | if not self.create_debug: |
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367 | try: |
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368 | f = open("/dev/null", "w") |
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369 | call(cmd, cwd=self.cli_dir, stdout=f, stderr=f, close_fds=True) |
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370 | f.close() |
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371 | except EnvironmentError, e: |
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372 | raise service_error(service_error.internal, |
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373 | "Failed to open /dev/null: %s" % e) |
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374 | |
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375 | def export_store_info(self, cf, vlan, connInfo): |
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376 | """ |
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377 | For the export requests in the connection info, install the peer names |
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378 | at the experiment controller via SetValue calls. |
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379 | """ |
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380 | |
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381 | for c in connInfo: |
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382 | for p in [ p for p in c.get('parameter', []) \ |
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383 | if p.get('type', '') == 'output']: |
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384 | |
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385 | if p.get('name', '') != 'vlan_id': |
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386 | self.log.error("Unknown export parameter: %s" % \ |
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387 | p.get('name')) |
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388 | continue |
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389 | |
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390 | k = p.get('key', None) |
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391 | surl = p.get('store', None) |
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392 | if surl and k: |
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393 | value = "%s" % vlan |
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394 | req = { 'name': k, 'value': value } |
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395 | print "calling SetValue %s %s" % (surl, req) |
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396 | self.call_SetValue(surl, req, cf) |
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397 | else: |
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398 | self.log.error("Bad export request: %s" % p) |
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399 | |
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400 | def initialize_experiment_info(self, aid, ename): |
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401 | repo = None |
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402 | self.state_lock.acquire() |
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403 | if aid in self.state: |
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404 | repo = self.state[aid].get('user', None) |
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405 | self.state[aid]['log'] = [ ] |
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406 | # Create a logger that logs to the experiment's state object as |
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407 | # well as to the main log file. |
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408 | alloc_log = logging.getLogger('fedd.access.%s' % ename) |
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409 | h = logging.StreamHandler( |
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410 | list_log.list_log(self.state[aid]['log'])) |
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411 | # XXX: there should be a global one of these rather than |
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412 | # repeating the code. |
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413 | h.setFormatter(logging.Formatter( |
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414 | "%(asctime)s %(name)s %(message)s", '%d %b %y %H:%M:%S')) |
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415 | alloc_log.addHandler(h) |
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416 | self.write_state() |
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417 | self.state_lock.release() |
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418 | return (repo, alloc_log) |
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419 | |
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420 | def finalize_experiment(self, topo, vlan_no, gri, aid, alloc_id, proof): |
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421 | """ |
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422 | Place the relevant information in the global state block, and prepare |
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423 | the response. |
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424 | """ |
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425 | rtopo = topo.clone() |
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426 | for s in rtopo.substrates: |
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427 | s.set_attribute('vlan', vlan_no) |
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428 | s.set_attribute('gri', gri) |
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429 | |
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430 | # Grab the log (this is some anal locking, but better safe than |
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431 | # sorry) |
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432 | self.state_lock.acquire() |
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433 | self.state[aid]['gri'] = gri |
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434 | logv = "".join(self.state[aid]['log']) |
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435 | # It's possible that the StartSegment call gets retried (!). |
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436 | # if the 'started' key is in the allocation, we'll return it rather |
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437 | # than redo the setup. |
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438 | self.state[aid]['started'] = { |
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439 | 'allocID': alloc_id, |
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440 | 'allocationLog': logv, |
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441 | 'segmentdescription': { |
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442 | 'topdldescription': rtopo.to_dict() |
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443 | }, |
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444 | 'proof': proof.to_dict(), |
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445 | } |
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446 | retval = copy.deepcopy(self.state[aid]['started']) |
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447 | self.write_state() |
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448 | self.state_lock.release() |
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449 | |
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450 | return retval |
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451 | |
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452 | def StartSegment(self, req, fid): |
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453 | err = None # Any service_error generated after tmpdir is created |
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454 | rv = None # Return value from segment creation |
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455 | |
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456 | try: |
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457 | req = req['StartSegmentRequestBody'] |
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458 | topref = req['segmentdescription']['topdldescription'] |
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459 | except KeyError: |
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460 | raise service_error(server_error.req, "Badly formed request") |
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461 | |
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462 | auth_attr = req['allocID']['fedid'] |
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463 | aid = "%s" % auth_attr |
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464 | attrs = req.get('fedAttr', []) |
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465 | access_ok, proof = self.auth.check_attribute(fid, auth_attr, |
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466 | with_proof=True) |
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467 | if not access_ok: |
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468 | raise service_error(service_error.access, "Access denied") |
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469 | else: |
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470 | # See if this is a replay of an earlier succeeded StartSegment - |
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471 | # sometimes SSL kills 'em. If so, replay the response rather than |
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472 | # redoing the allocation. |
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473 | self.state_lock.acquire() |
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474 | retval = self.state[aid].get('started', None) |
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475 | self.state_lock.release() |
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476 | if retval: |
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477 | self.log.warning("Duplicate StartSegment for %s: " % aid + \ |
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478 | "replaying response") |
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479 | return retval |
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480 | |
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481 | certfile = "%s/%s.pem" % (self.certdir, aid) |
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482 | |
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483 | if topref: |
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484 | topo = topdl.Topology(**topref) |
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485 | else: |
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486 | raise service_error(service_error.req, |
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487 | "Request missing segmentdescription'") |
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488 | |
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489 | connInfo = req.get('connection', []) |
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490 | |
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491 | cap, src, dest, vlans = self.extract_parameters(topo) |
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492 | |
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493 | for a in attrs: |
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494 | if a['attribute'] == 'experiment_name': |
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495 | ename = a['value'] |
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496 | break |
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497 | else: ename = aid |
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498 | |
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499 | repo, alloc_log = self.initialize_experiment_info(aid, ename) |
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500 | |
---|
501 | if not repo: |
---|
502 | raise service_error(service_error.internal, |
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503 | "Can't find creation user for %s" % aid) |
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504 | |
---|
505 | gri, vlan_no = self.start_segment(repo, src, dest, cap, vlans, |
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506 | log=alloc_log) |
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507 | |
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508 | self.export_store_info(certfile, vlan_no, connInfo) |
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509 | |
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510 | |
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511 | if gri: |
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512 | return self.finalize_experiment(topo, vlan_no, gri, aid, |
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513 | req['allocID'], proof) |
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514 | elif err: |
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515 | raise service_error(service_error.federant, |
---|
516 | "Swapin failed: %s" % err) |
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517 | else: |
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518 | raise service_error(service_error.federant, "Swapin failed") |
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519 | |
---|
520 | def TerminateSegment(self, req, fid): |
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521 | try: |
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522 | req = req['TerminateSegmentRequestBody'] |
---|
523 | except KeyError: |
---|
524 | raise service_error(server_error.req, "Badly formed request") |
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525 | |
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526 | auth_attr = req['allocID']['fedid'] |
---|
527 | aid = "%s" % auth_attr |
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528 | |
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529 | self.log.debug("Terminate request for %s" %aid) |
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530 | attrs = req.get('fedAttr', []) |
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531 | access_ok, proof = self.auth.check_attribute(fid, auth_attr, |
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532 | with_proof=True) |
---|
533 | if not access_ok: |
---|
534 | raise service_error(service_error.access, "Access denied") |
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535 | |
---|
536 | self.state_lock.acquire() |
---|
537 | if self.state.has_key(aid): |
---|
538 | gri = self.state[aid].get('gri', None) |
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539 | user = self.state[aid].get('user', None) |
---|
540 | else: |
---|
541 | gri = None |
---|
542 | user = None |
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543 | self.state_lock.release() |
---|
544 | self.log.debug("Stop segment for user: %s gre %s" %(user, gri)) |
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545 | |
---|
546 | if not gri: |
---|
547 | raise service_error(service_error.internal, |
---|
548 | "Can't find gri for %s" % aid) |
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549 | |
---|
550 | if not user: |
---|
551 | raise service_error(service_error.internal, |
---|
552 | "Can't find creation user for %s" % aid) |
---|
553 | |
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554 | self.log.debug("Stop segment for GRI: %s" %gri) |
---|
555 | self.stop_segment(user, gri) |
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556 | return { 'allocID': req['allocID'], 'proof': proof.to_dict() } |
---|