| 1 | import os, re, string |
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| 2 | |
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| 3 | # Inspired by Django tips on: |
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| 4 | # http://www.b-list.org/weblog/2006/jun/07/django-tips-write-better-template-tags/ |
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| 5 | from django import template |
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| 6 | from django.template.defaultfilters import stringfilter |
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| 7 | from django.utils.encoding import smart_unicode, force_unicode |
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| 8 | |
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| 9 | from sara_cmt.logger import Logger |
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| 10 | logger = Logger().getLogger() |
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| 11 | |
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| 12 | #from django.db.models import get_model |
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| 13 | |
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| 14 | register = template.Library() |
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| 15 | |
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| 16 | class NoBlankLinesNode(template.Node): |
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| 17 | """ |
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| 18 | Renderer that'll remove all blank lines. |
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| 19 | """ |
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| 20 | |
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| 21 | def __init__(self, nodelist): |
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| 22 | self.nodelist = nodelist |
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| 23 | |
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| 24 | def render(self, context): |
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| 25 | return re.sub('\n([\ \t]*\n)+', '\n', force_unicode( |
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| 26 | self.nodelist.render(context))) |
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| 27 | |
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| 28 | @register.tag |
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| 29 | def noblanklines(parser, token): |
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| 30 | nodelist = parser.parse(('endnoblanklines',)) |
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| 31 | parser.delete_first_token() |
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| 32 | return NoBlankLinesNode(nodelist) |
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| 33 | |
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| 34 | @stringfilter |
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| 35 | def arpanize(value): |
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| 36 | """ |
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| 37 | Converts a IP (range) to reversed DNS style arpa notation |
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| 38 | |
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| 39 | Usage: |
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| 40 | {{{ <variable>|arpanize }}} |
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| 41 | |
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| 42 | I.e.: |
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| 43 | {% assign broadcast = '192.168.1.0' %} |
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| 44 | {{{ broastcast|arpanize }}} |
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| 45 | Results in output: |
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| 46 | 1.168.192.in-addr.arpa |
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| 47 | """ |
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| 48 | ip_blocks = value.split('.') |
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| 49 | |
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| 50 | reverse_block = [ ip_blocks[2], ip_blocks[1], ip_blocks[0], 'in-addr.arpa' ] |
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| 51 | |
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| 52 | return string.join( reverse_block, '.' ) |
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| 53 | |
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| 54 | register.filter( 'arpanize', arpanize ) |
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| 55 | |
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| 56 | @stringfilter |
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| 57 | def base_net(value): |
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| 58 | """ |
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| 59 | Converts a IP (range) to it's first 3 octects |
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| 60 | |
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| 61 | Usage: |
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| 62 | {{{ <variable>|base_net }}} |
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| 63 | |
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| 64 | I.e.: |
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| 65 | {% assign broadcast = '192.168.1.0' %} |
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| 66 | {{{ broastcast|base_net }}} |
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| 67 | Results in output: |
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| 68 | 192.168.1 |
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| 69 | """ |
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| 70 | ip_blocks = value.split('.') |
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| 71 | |
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| 72 | return string.join( ip_blocks[:3], '.' ) |
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| 73 | |
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| 74 | register.filter( 'base_net', base_net ) |
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| 75 | |
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| 76 | @stringfilter |
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| 77 | def ip_last_digit(value): |
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| 78 | """ |
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| 79 | Converts a IP (range) to it's last octect |
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| 80 | |
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| 81 | Usage: |
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| 82 | {{{ <variable>|ip_last_digit }}} |
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| 83 | |
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| 84 | I.e.: |
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| 85 | {% assign myip = '192.168.1.123' %} |
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| 86 | {{{ myip|ip_last_digit }}} |
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| 87 | Results in output: |
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| 88 | 123 |
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| 89 | """ |
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| 90 | ip_blocks = value.split('.') |
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| 91 | |
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| 92 | return ip_blocks[3] |
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| 93 | |
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| 94 | register.filter( 'ip_last_digit', ip_last_digit ) |
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| 95 | |
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| 96 | @register.tag(name='assign') |
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| 97 | def do_assign(parser,token): |
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| 98 | |
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| 99 | """ |
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| 100 | Variable assignment within template |
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| 101 | |
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| 102 | Usage: {% assign newvar = <space seperated list of strings/vars> %} |
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| 103 | i.e.: {% assign file_name = '/var/tmp/rack-' rack.label '.txt' %} |
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| 104 | """ |
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| 105 | definition = token.split_contents() |
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| 106 | |
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| 107 | if len(definition) < 4: |
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| 108 | raise template.TemplateSyntaxError, '%r tag requires at least 4 arguments' % tag |
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| 109 | |
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| 110 | tag = definition[0] |
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| 111 | new_var = definition[1] |
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| 112 | is_teken = definition[2] |
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| 113 | assignees = definition[3:] |
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| 114 | |
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| 115 | return resolveVariables( new_var, assignees ) |
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| 116 | |
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| 117 | class resolveVariables(template.Node): |
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| 118 | |
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| 119 | def __init__(self, varname, varlist ): |
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| 120 | |
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| 121 | self.varname = varname |
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| 122 | self.varlist = varlist |
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| 123 | |
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| 124 | def render(self, context): |
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| 125 | resvars = [ ] |
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| 126 | |
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| 127 | for a in self.varlist: |
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| 128 | |
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| 129 | var_str = '' |
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| 130 | |
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| 131 | if not (a[0] == a[-1] and a[0] in ('"', "'")): |
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| 132 | try: |
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| 133 | # RB: no quotes must mean its a variable |
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| 134 | # |
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| 135 | a_var = template.Variable( a ) |
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| 136 | var_str = a_var.resolve(context) |
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| 137 | |
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| 138 | except template.VariableDoesNotExist: |
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| 139 | |
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| 140 | #RB: still think not allowed to raise exceptions from render function |
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| 141 | # |
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| 142 | #raise template.TemplateSyntaxError, 'cannot resolve variable %r' %( str( self.path ) ) |
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| 143 | pass |
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| 144 | |
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| 145 | resvars.append( str(var_str) ) |
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| 146 | |
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| 147 | else: |
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| 148 | #RB: assume strings are quoted |
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| 149 | #RB: strip quotes from string |
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| 150 | # |
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| 151 | a = str( a.strip("'").strip('"') ) |
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| 152 | resvars.append( str(a) ) |
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| 153 | |
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| 154 | #RB: finally assign the concatenated string to new varname |
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| 155 | context[ self.varname ] = string.join( resvars, '' ) |
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| 156 | |
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| 157 | #RB: Django render functions not supposed/allowed to raise Exception, I think |
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| 158 | return '' |
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| 159 | |
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| 160 | @register.tag(name='store') |
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| 161 | def do_save_meta(parser, token): |
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| 162 | """ |
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| 163 | Compilation function to use for meta-info. |
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| 164 | |
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| 165 | Usage: {% store '/path/to/file' %} |
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| 166 | {% store variable %} # variable = '/path/to/file' |
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| 167 | """ |
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| 168 | definition = token.split_contents() |
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| 169 | |
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| 170 | if len(definition) != 4 and len(definition) != 2: |
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| 171 | raise template.TemplateSyntaxError, '%r tag requires at least 1 arguments' % tag |
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| 172 | |
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| 173 | tag = definition[0] |
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| 174 | path_arg = definition[1] |
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| 175 | #kw_as = definition[2] |
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| 176 | #kw_output = definition[3] |
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| 177 | |
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| 178 | if len(definition) == 4: |
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| 179 | |
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| 180 | #RB: OLDSTYLE |
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| 181 | #RB: 4 arguments means: {% store /path/filename as output %} |
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| 182 | #RB: old style: DONT try to resolve variable |
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| 183 | #RB: instead convert filename to quoted string |
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| 184 | |
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| 185 | path_str = "'%s'" %path_arg |
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| 186 | |
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| 187 | # RB: parse the entire template for old-style |
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| 188 | nodelist = parser.parse() |
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| 189 | |
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| 190 | # RB: set backwards compatibility for StoreOutput |
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| 191 | bw_compat = True |
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| 192 | |
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| 193 | else: |
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| 194 | #RB: NEWSTYLE |
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| 195 | #RB: 2 arguments can mean: {% store 'string' %} |
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| 196 | #RB: 2 arguments can mean: {% store variable %} |
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| 197 | |
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| 198 | path_str = path_arg |
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| 199 | |
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| 200 | # RB: parse the template thing until %endstore found |
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| 201 | nodelist = parser.parse(('endstore',)) |
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| 202 | # RB: throw away %endstore tag |
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| 203 | parser.delete_first_token() |
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| 204 | |
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| 205 | # RB: no backwards compatibility for StoreOutput |
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| 206 | bw_compat = False |
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| 207 | |
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| 208 | # RB: Now lets start writing output files |
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| 209 | return generateStoreOutput(tag, path_str, nodelist, bw_compat) |
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| 210 | |
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| 211 | class generateStoreOutput(template.Node): |
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| 212 | |
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| 213 | def __init__(self, tag, path_str, nodelist, bw_compat=False): |
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| 214 | self.tag = tag |
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| 215 | self.nodelist = nodelist |
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| 216 | self.path_str = path_str |
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| 217 | self.bw_compat = bw_compat |
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| 218 | |
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| 219 | def render(self, context): |
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| 220 | |
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| 221 | if (self.path_str[0] == self.path_str[-1] and self.path_str[0] in ('"', "'")): |
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| 222 | |
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| 223 | mypath_str = str(self.path_str)[1:-1] |
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| 224 | |
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| 225 | else: |
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| 226 | # RB: Not quoted: must be a variable: attempt to resolve to value |
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| 227 | try: |
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| 228 | pathvar = template.Variable( str(self.path_str) ) |
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| 229 | mypath_str = pathvar.resolve(context) |
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| 230 | except template.VariableDoesNotExist: |
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| 231 | #raise template.TemplateSyntaxError, '%r tag argument 1: not a variable %r' %( tag, path_str ) |
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| 232 | pass |
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| 233 | |
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| 234 | if self.bw_compat: |
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| 235 | # RB: store 'output' variable filename for BW compat |
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| 236 | |
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| 237 | context[ 'output' ] = mypath_str |
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| 238 | |
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| 239 | # RB: render template between store tags |
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| 240 | output = self.nodelist.render(context) |
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| 241 | |
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| 242 | # RB: store output in context dict for later writing to file |
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| 243 | context['stores'][ mypath_str ] = output |
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| 244 | |
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| 245 | # RB: output generated into context dict, so we return nothing |
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| 246 | return '' |
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| 247 | |
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| 248 | class ScriptNode(template.Node): |
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| 249 | """ |
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| 250 | Renderer, which executes the lines included in the script-tags. |
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| 251 | """ |
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| 252 | |
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| 253 | def __init__(self, nodelist): |
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| 254 | self.nodelist = nodelist |
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| 255 | |
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| 256 | def render(self, context): |
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| 257 | script = self.nodelist.render(context) |
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| 258 | if context.has_key('epilogue'): |
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| 259 | context['epilogue'].append(script) |
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| 260 | else: |
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| 261 | context['epilogue'] = [script] |
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| 262 | # All content between {% epilogue %} and {% endepilogue %} is parsed now |
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| 263 | return '' |
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| 264 | |
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| 265 | @register.tag(name='epilogue') |
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| 266 | def do_epilogue(parser, token): |
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| 267 | """ |
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| 268 | Saving the contents between the epilogue-tags |
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| 269 | """ |
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| 270 | nodelist = parser.parse(('endepilogue',)) |
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| 271 | parser.delete_first_token() |
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| 272 | return ScriptNode(nodelist) |
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| 273 | |
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| 274 | from django.db.models import get_model |
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| 275 | |
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| 276 | @register.tag(name='getbasenets') |
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| 277 | def do_getbasenets(parser, token): |
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| 278 | |
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| 279 | try: |
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| 280 | tag, network_name, kw_as, varname = token.split_contents() |
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| 281 | except ValueError: |
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| 282 | raise template.TemplateSyntaxError, '%r tag requires exactly 4 arguments' % tag |
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| 283 | |
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| 284 | return getBaseNets( varname, network_name ) |
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| 285 | |
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| 286 | class getBaseNets(template.Node): |
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| 287 | |
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| 288 | """ |
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| 289 | Get list of basenets in a network (name) |
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| 290 | |
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| 291 | Usage: {% getbasenets <network name> as <listname> %} |
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| 292 | """ |
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| 293 | |
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| 294 | def __init__(self, varname, network_name ): |
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| 295 | |
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| 296 | self.varname = varname |
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| 297 | self.network_name = network_name.strip("'").strip('"').__str__() |
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| 298 | self.basenets = [ ] |
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| 299 | |
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| 300 | def render(self, context): |
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| 301 | |
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| 302 | if (self.network_name[0] == self.network_name[-1] and self.network_name[0] in ('"', "'")): |
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| 303 | |
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| 304 | network_str = str( self.network_name.strip("'").strip('"') ) |
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| 305 | else: |
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| 306 | # RB: Not quoted: must be a variable: attempt to resolve to value |
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| 307 | try: |
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| 308 | networkvar = template.Variable( str(self.network_name) ) |
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| 309 | network_str = networkvar.resolve(context) |
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| 310 | except template.VariableDoesNotExist: |
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| 311 | #raise template.TemplateSyntaxError, '%r tag argument 1: not a variable %r' %( tag, path_str ) |
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| 312 | pass |
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| 313 | |
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| 314 | from IPy import IP |
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| 315 | |
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| 316 | network_units = get_model('cluster', 'Network').objects.filter( name=str(network_str) ) |
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| 317 | |
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| 318 | for n in network_units: |
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| 319 | |
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| 320 | for ipnum in IP( n.cidr ): |
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| 321 | if not base_net( ipnum ) in self.basenets: |
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| 322 | self.basenets.append( str( base_net( ipnum ) ) ) |
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| 323 | |
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| 324 | context[ self.varname ] = self.basenets |
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| 325 | self.basenets = [ ] |
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| 326 | |
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| 327 | return '' |
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| 328 | |
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| 329 | @register.tag(name='getracks') |
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| 330 | def do_getracks(parser, token): |
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| 331 | |
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| 332 | try: |
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| 333 | tag, cluster, kw_as, name = token.split_contents() |
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| 334 | except ValueError: |
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| 335 | raise template.TemplateSyntaxError, '%r tag requires exactly 4 arguments' % tag |
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| 336 | |
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| 337 | return getRacks( name, cluster ) |
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| 338 | |
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| 339 | class getRacks(template.Node): |
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| 340 | |
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| 341 | """ |
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| 342 | Get list of racks in a cluster |
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| 343 | |
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| 344 | Usage: {% getracks <cluster> as <listname> %} |
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| 345 | """ |
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| 346 | |
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| 347 | def __init__(self, name, cluster): |
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| 348 | |
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| 349 | self.name = name |
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| 350 | self.cluster = cluster.strip("'").strip('"').__str__() |
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| 351 | self.racks = [ ] |
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| 352 | |
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| 353 | def render(self, context): |
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| 354 | |
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| 355 | cluster_units = get_model('cluster', 'HardwareUnit').objects.filter( cluster__name=str(self.cluster) ) |
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| 356 | |
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| 357 | for u in cluster_units: |
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| 358 | if u.rack not in self.racks: |
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| 359 | self.racks.append( u.rack ) |
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| 360 | |
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| 361 | context[ self.name ] = self.racks |
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| 362 | return '' |
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| 363 | |
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| 364 | @register.tag(name='use') |
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| 365 | def do_use(parser, token): |
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| 366 | """ |
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| 367 | Compilation function to definine Querysets for later use. |
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| 368 | |
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| 369 | Usage: {% use <entity> with <attribute>=<value> as <list/var> <key> %} |
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| 370 | """ |
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| 371 | tag = token.contents.split()[0] |
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| 372 | |
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| 373 | try: |
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| 374 | definition = token.split_contents() |
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| 375 | # definition should look like ['use', <entity>, 'with' <query>, 'as', '<key>'] |
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| 376 | except ValueError: |
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| 377 | raise template.TemplateSyntaxError, '%r tag requires at least 5 arguments' % tag |
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| 378 | if len(definition) != 6: |
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| 379 | raise template.TemplateSyntaxError, '%r tag requires at least 5 arguments' % tag |
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| 380 | if definition[2] != 'with': |
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| 381 | raise template.TemplateSyntaxError, "second argument of %r tag has to be 'with'" % tag |
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| 382 | if definition[-2] != 'as': |
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| 383 | raise template.TemplateSyntaxError, "second last argument of %r tag has to be 'as'" % tag |
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| 384 | |
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| 385 | entity = definition[1] |
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| 386 | query = definition[-3] |
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| 387 | key = definition[-1] |
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| 388 | |
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| 389 | return QuerySetNode(entity, query, key) |
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| 390 | |
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| 391 | class QuerySetNode(template.Node): |
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| 392 | """ |
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| 393 | Renderer, which fetches objects from the database. |
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| 394 | """ |
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| 395 | |
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| 396 | def __init__(self, entity, query, key): |
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| 397 | self.entity = entity |
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| 398 | self.query = query |
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| 399 | self.key = key |
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| 400 | |
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| 401 | def render(self, context): |
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| 402 | |
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| 403 | if (self.query[0] == self.query[-1] and self.query[0] in ('"', "'")): |
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| 404 | |
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| 405 | myquery_str = str( self.query.strip("'").strip('"') ) |
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| 406 | else: |
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| 407 | # RB: Not quoted: must be a variable: attempt to resolve to value |
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| 408 | try: |
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| 409 | queryvar = template.Variable( str(self.query) ) |
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| 410 | myquery_str = queryvar.resolve(context) |
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| 411 | except template.VariableDoesNotExist: |
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| 412 | #raise template.TemplateSyntaxError, '%r tag argument 1: not a variable %r' %( tag, path_str ) |
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| 413 | pass |
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| 414 | |
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| 415 | attr, val = myquery_str.split('=') |
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| 416 | queryset = get_model('cluster', self.entity).objects.filter(**{attr:val}) |
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| 417 | if len(queryset) == 1: |
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| 418 | queryset = queryset[0] |
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| 419 | context[self.key] = queryset |
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| 420 | logger.debug('context = %s'%context) |
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| 421 | return '' |
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| 422 | |
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| 423 | # use <entity> with <attribute>=<value> as <key> |
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| 424 | |
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| 425 | |
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| 426 | |
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