F5 "else" statement (junos)

[petzah]

if { something } {
do X
} else {
do Y
}

Traceback (most recent call last):
File "./test.py", line 4, in
parse = CiscoConfParse('file.conf', syntax='junos', debug=True, comment='#')
File "/usr/lib/pymodules/python2.7/ciscoconfparse/ciscoconfparse.py", line 225, in init
config = self.convert_braces_to_ios(rgx.split(text))
File "/usr/lib/pymodules/python2.7/ciscoconfparse/ciscoconfparse.py", line 351, in convert_braces_to_ios
line, line_offset = line_level(tmp.strip())
File "/usr/lib/pymodules/python2.7/ciscoconfparse/ciscoconfparse.py", line 345, in line_level
raise ValueError("Could not parse: '{0}'".format(input))
ValueError: Could not parse: '} else {'

[kthned]

Hi
Did you get the solution for this ? I am having the similar issue while parsing F5.

[timothyfranson]

After fussing with it for the better part of today I came up with the below solution which finally allowed all my F5 parsing to run without issue. It's not the cleanest solution and I'm sure it can be improved but it works well enough to allow me to accomplish what I set out for. Python 3.5.2.

# Prep F5 config before instantiating the CiscoConfParse instance
import re

clean_conf = []
for line in bigip_conf:
    # the comment kwarg of CiscoConfParse does not work right
    if re.match(r'^(\s*#)', line):
        continue
    # kill empty '{ }' that break the parser
    new_line = line.replace(' { }', '')
    # remove one-line configs.  cause problems with parser
    # example of line removed:  'monitor min 1 of { /some/monitor /some/othermonitor }'
    if re.match(r'^(.+?{)(.+?}\s*)$', new_line):
        continue
    # separate '} else(if) {' lines so parser interprets them properly
    if re.match(r'\s*\}\s+else(if)?', new_line):
        new_line = re.sub(r'\}\s+elseif', '}\nelseif', new_line, count=1)
        new_line = re.sub(r'\}\s+else\s*{', '}\nelse {', new_line, count=1)
        new_line = new_line.split('\n', maxsplit=1)
        clean_conf.extend(new_line)
        continue
    clean_conf.append(new_line)

[mpenning]

Please try version 1.2.52 and see if this helps...

[timothyfranson]

Just gave it a shot, still runs into an issue. Lines like the below would be common in iRules.

File "/var/www/asdf/fetch.py", line 344, in fetch_f5_config
parse = CiscoConfParse(bigip_conf, syntax='junos', comment='#')
File "/var/www/asdf/venv/lib/python3.5/site-packages/ciscoconfparse/ciscoconfparse.py", line 188, in init
config = self.convert_braces_to_ios(config)
File "/var/www/asdf/venv/lib/python3.5/site-packages/ciscoconfparse/ciscoconfparse.py", line 402, in convert_braces_to_ios
line, line_offset = line_level(tmp.strip())
File "/var/www/asdf/venv/lib/python3.5/site-packages/ciscoconfparse/ciscoconfparse.py", line 396, in line_level
raise ValueError("Could not parse: '{0}'".format(input))
ValueError: Could not parse: '} elseif { $path starts_with "/abc" || $path starts_with "/abc/123" } {'

[mpenning]

I don't have access to an F5 anymore... can someone respond with a sanitized F5 config with some else and elseif conditions in it?

[timothyfranson]

Attached below. Very generically sanitized. Ctrl+f for 'if_elseif_rule' for a good example complete with nested if statements.

sanitized_bigip.conf.txt

[mpenning]

@timothyfranson , I finally rewrote the junos parser to support these kind of F5 configs... please test version 1.5.1 and tell me whether this works for you.