author | Tero Marttila <terom@paivola.fi> |
Mon, 09 Mar 2015 23:31:13 +0200 | |
changeset 738 | 3104fdf7ea26 |
parent 734 | 5770ed34c1f0 |
child 739 | 5149c39f3dfc |
permissions | -rw-r--r-- |
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import collections |
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import ipaddr |
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import logging; log = logging.getLogger('pvl.hosts.host') |
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import pvl.dns |
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class HostError (Exception): |
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""" |
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An error associated with some specific Host. |
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""" |
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def __init__(self, host, error): |
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""" |
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host : Host which caused error |
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error : Exception or str message |
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""" |
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self.host = host |
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self.error = error |
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|
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def __str__ (self): |
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return "{self.host}: {self.error}".format(self=self) |
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def parse_bool(value): |
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""" |
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Normalize optional boolean value. |
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""" |
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if value is None: |
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return None |
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elif value: |
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return True |
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else: |
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return False |
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def parse_ip(value, type): |
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if value: |
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return type(value) |
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else: |
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return None |
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def parse_list(value): |
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""" |
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Parse list of strings. |
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""" |
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if value: |
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return value.split() |
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else: |
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return () |
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def parse_location(location, domain): |
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""" |
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Parse location@domain. |
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""" |
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if not location: |
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return None |
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if '@' in location: |
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location, location_domain = location.split('@', 1) |
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else: |
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location_domain = domain |
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return (location, location_domain) |
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def parse_ethernet(value): |
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""" |
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Normalize ethernet str. |
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""" |
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return ':'.join('%02x' % int(x, 16) for x in value.split(':')) |
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def parse_dhcp_boot(boot): |
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""" |
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Parse the dhcp boot=... option |
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>>> print parse_dhcp_boot(None) |
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{} |
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>>> print parse_dhcp_boot({'filename': '/foo'}) |
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{'filename': '/foo'} |
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>>> print parse_dhcp_boot({'filename': '/foo', 'next-server': 'bar'}) |
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{'next-server': 'bar', 'filename': '/foo'} |
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>>> print parse_dhcp_boot('/foo') |
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{'filename': '/foo'} |
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>>> print parse_dhcp_boot('bar:/foo') |
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{'next-server': 'bar', 'filename': '/foo'} |
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>>> print parse_dhcp_boot('bar:') |
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{'next-server': 'bar'} |
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>>> print parse_dhcp_boot('foo') |
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Traceback (most recent call last): |
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... |
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ValueError: invalid boot=foo |
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""" |
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# normalize to dict |
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if not boot: |
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boot = { } |
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elif not isinstance(boot, dict): |
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boot = { None: boot } |
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else: |
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boot = dict(boot) |
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# support either an instanced dict or a plain str or a mixed instanced-with-plain-str |
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boot_str = boot.pop(None, None) |
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105 |
if not (set(boot) <= set(('filename', 'next-server', None))): |
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raise ValueError("Invalid boot.*: {instances}".format(instances=' '.join(boot))) |
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107 |
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# any boot= given overrides boot.* fields |
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109 |
if not boot_str: |
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110 |
pass |
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111 |
elif boot_str.startswith('/'): |
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boot['filename'] = boot_str |
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113 |
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114 |
elif boot_str.endswith(':'): |
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boot['next-server'] = boot_str[:-1] |
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116 |
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117 |
elif ':' in boot_str: |
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boot['next-server'], boot['filename'] = boot_str.split(':', 1) |
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119 |
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else : |
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raise ValueError("invalid boot={boot}".format(boot=boot_str)) |
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122 |
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123 |
return boot |
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124 |
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125 |
def parse_str(value): |
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126 |
""" |
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Normalize optional string value. |
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128 |
""" |
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129 |
|
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130 |
if value is None: |
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131 |
# omit |
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132 |
return None |
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133 |
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134 |
elif value: |
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135 |
return str(value) |
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136 |
|
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137 |
else: |
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138 |
# empty value |
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139 |
return False |
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def parse_dict(value, parse, **opts): |
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if not value: |
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143 |
return { } |
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144 |
|
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145 |
if isinstance(value, dict): |
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146 |
values = value |
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147 |
else: |
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148 |
values = {None: value} |
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149 |
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return {instance: parse(value, **opts) for instance, value in values.iteritems()} |
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151 |
|
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152 |
class Host (object) : |
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153 |
""" |
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154 |
A host is a network node that can have multiple ethernet interfaces, and multiple IP addresses in different domains. |
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155 |
""" |
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156 |
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157 |
EXTENSIONS = { } |
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158 |
|
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159 |
@classmethod |
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160 |
def build_extensions(cls, extensions): |
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161 |
for extension, value in extensions.iteritems(): |
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extension_cls = cls.EXTENSIONS.get(extension) |
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163 |
|
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164 |
if extension_cls: |
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yield extension, extension_cls.build(**value) |
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166 |
else: |
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167 |
log.warning("skip unknown extension: %s", extension) |
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168 |
|
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169 |
@classmethod |
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170 |
def build (cls, name, domain, |
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ip=None, ip6=None, |
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172 |
ethernet=None, |
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173 |
owner=None, |
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174 |
location=None, |
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175 |
alias=None, alias4=None, alias6=None, |
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176 |
forward=None, reverse=None, |
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177 |
down=None, |
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178 |
boot=None, |
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179 |
extensions={ }, |
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180 |
) : |
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181 |
""" |
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182 |
Return a Host initialized from data attributes. |
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183 |
|
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|
184 |
This handles all string parsing to our data types. |
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185 |
""" |
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186 |
|
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|
187 |
return cls(name, |
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188 |
domain = domain, |
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189 |
ip4 = parse_ip(ip, ipaddr.IPv4Address), |
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190 |
ip6 = parse_ip(ip6, ipaddr.IPv6Address), |
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|
191 |
ethernet = parse_dict(ethernet, parse_ethernet), |
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192 |
owner = owner, |
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|
193 |
location = parse_location(location, domain), |
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194 |
alias = parse_list(alias), |
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195 |
alias4 = parse_list(alias4), |
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196 |
alias6 = parse_list(alias6), |
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197 |
forward = parse_str(forward), |
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198 |
reverse = parse_str(reverse), |
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199 |
down = parse_bool(down), |
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200 |
boot = parse_dhcp_boot(boot), |
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201 |
extensions = dict(cls.build_extensions(extensions)), |
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202 |
) |
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203 |
|
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204 |
def __init__ (self, name, domain, |
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205 |
ip4=None, ip6=None, |
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206 |
ethernet={ }, |
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207 |
owner=None, |
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208 |
location=None, |
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209 |
alias=(), alias4=(), alias6=(), |
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210 |
forward=None, reverse=None, |
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down=None, |
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boot=None, |
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extensions={}, |
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214 |
): |
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""" |
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name - str |
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domain - str |
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ip4 - primary ipaddr.IPv4Address |
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ip6 - primary ipaddr.IPv6Address |
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ethernet - { index: ethernet } |
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alias - [ str ]: generate CNAMEs for given relative names |
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owner - str: LDAP uid |
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location - None or (name, domain) |
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alias4 - [ str ]: generate additional A records for given relative names |
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alias6 - [ str ]: generate additional AAAA records for given relative names |
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forward - None: generate forward zone A/AAAA records per ip/ip6 |
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False: omit A/AAAA records (and any alias= CNAMEs) |
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str: generate forward zone CNAME to given fqdn |
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reverse - None: generate reverse zone PTR records per ip/ip6 |
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False: omit PTR records for ip/ip6 |
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str: generate IPv4 reverse zone CNAME to given fqdn, and omit IPv6 PTR |
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232 |
down - mark as offline for polling |
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233 |
""" |
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234 |
|
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self.name = name |
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self.domain = domain |
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self.ip4 = ip4 |
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238 |
self.ip6 = ip6 |
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self.ethernet = ethernet |
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240 |
self.alias = alias |
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241 |
self.alias4 = alias4 |
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242 |
self.alias6 = alias6 |
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243 |
self.owner = owner |
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244 |
self.location = location |
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245 |
self.boot = boot |
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246 |
self.forward = forward |
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247 |
self.reverse = reverse |
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248 |
self.down = down |
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249 |
self.extensions = extensions |
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250 |
|
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251 |
def sort_key (self): |
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252 |
""" |
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253 |
Stable sort ordering |
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254 |
""" |
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255 |
|
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256 |
if self.ip4: |
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257 |
return self.ip4 |
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258 |
else: |
440
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|
259 |
# sorts first |
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260 |
return ipaddr.IPAddress(0) |
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|
261 |
|
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|
262 |
def addresses (self): |
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263 |
""" |
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264 |
Yield (sublabel, ipaddr) records. |
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265 |
""" |
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266 |
|
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267 |
if self.ip4: |
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268 |
yield None, self.ip4 |
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269 |
|
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270 |
if self.ip6: |
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271 |
yield None, self.ip6 |
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272 |
|
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273 |
for extension in self.extensions.itervalues(): |
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274 |
for sublabel, ip in extension.addresses(): |
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275 |
yield sublabel, ip |
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|
276 |
|
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277 |
def fqdn (self): |
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278 |
""" |
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279 |
Return DNS FQDN for this host in its domain. |
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280 |
""" |
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281 |
|
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|
282 |
if self.domain: |
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|
283 |
return pvl.dns.fqdn(self.name, self.domain) |
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284 |
else: |
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285 |
return pvl.dns.fqdn(self.name) |
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|
286 |
|
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|
287 |
def __str__ (self): |
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288 |
return "{self.name}@{domain}".format(self=self, |
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|
289 |
domain = self.domain or '', |
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|
290 |
) |
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291 |
|
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292 |
class HostExtension (object): |
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|
293 |
""" |
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|
294 |
Base class for Host.EXTENSIONS |
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295 |
|
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|
296 |
Provides default no-op behaviours for extension hooks. |
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297 |
""" |
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298 |
|
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299 |
def addresses (self): |
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300 |
""" |
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301 |
Yield additional (sublabel, ipaddr) records. |
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302 |
""" |
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|
303 |
|
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304 |
return () |
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|
305 |
|
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|
306 |
def extension (cls): |
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307 |
""" |
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308 |
Register an extension class |
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309 |
""" |
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310 |
|
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311 |
Host.EXTENSIONS[cls.EXTENSION] = cls |
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312 |