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Contents
require 'snmp/open/parser'
require 'snmp/open/command_reader'
# Simple Network Management Protocol
module SNMP
# Converts types introduced by the snmp gem to native ruby types
module_function def convert_from_snmp_to_ruby(value)
return nil if [NoSuchInstance, NoSuchObject, Null].include?(value)
case value
when Integer
value.to_i
when IpAddress, String
value.to_s
else
value
end
end
# Open3-based wrapper for SNMP CLI commands
class Open
attr_reader :reader
# see CommandReader for a description of options
def initialize(options = {})
@reader = options[:reader] || CommandReader.new(options)
end
# Perform an SNMP get using the "snmpget" command and parse the output
def get(oids)
return enum_for(:get, oids) unless block_given?
texts = oids.map { |oid| reader.capture(:get, oid) }
Parser.new(oids).parse(texts).fetch(0, []).each { |arg| yield(arg) }
end
# Perform an SNMP walk using the "snmpwalk" or "snmpbulkwalk" commands and
# parse the output
def walk(oids, **kwargs)
return enum_for(:walk, oids, **kwargs) unless block_given?
bulk = kwargs.fetch(:bulk, true)
options = walk_options(bulk, **kwargs)
cmd = bulk ? :bulkwalk : :walk
texts = oids.map { |oid| reader.capture(cmd, oid, options) }
Parser.new(oids).parse(texts).each { |*args| yield(*args) }
end
def walk_options(bulk, **kwargs)
if bulk
{
'-Cn' => kwargs.fetch(:non_repeaters, 0),
'-Cr' => kwargs.fetch(:max_repetitions, 10)
}
else
{}
end
end
end # class Open
end # module SNMP
Version data entries
6 entries across 6 versions & 1 rubygems