Method: Net::SNMP::Session#walk

Defined in:
lib/net/snmp/session.rb

#walk(oidlist) ⇒ Object

Issue repeated getnext requests on each oid passed in until the result is no longer a child. Returns a hash with the numeric oid strings as keys. XXX work in progress. only works synchronously (except with EM + fibers). Need to do better error checking and use getbulk when avaiable.



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# File 'lib/net/snmp/session.rb', line 297

def walk(oidlist)
  oidlist = [oidlist] unless oidlist.kind_of?(Array)
  oidlist = oidlist.map {|o| o.kind_of?(OID) ? o : OID.new(o)}
  all_results = {}
  base_list = oidlist
  while(!oidlist.empty? && pdu = get_next(oidlist))
    debug "==============================================================="
    debug "base_list = #{base_list}"
    prev_base = base_list.dup
    oidlist = []
    #print_errors
    #pdu.print_errors
    pdu.varbinds.each_with_index do |vb, i|
      if prev_base[i].parent_of?(vb.oid) && vb.object_type != Constants::SNMP_ENDOFMIBVIEW
        # Still in subtree.  Store results and add next oid to list
        debug "adding #{vb.oid} to oidlist"
        all_results[vb.oid.to_s] = vb.value
        oidlist << vb.oid
      else
        # End of subtree.  Don't add to list or results
        debug "End of subtree"
        base_list.delete_at(i)
        debug "not adding #{vb.oid}"
      end
      # If get a pdu error, we can only tell the first failing varbind,
      # So we remove it and resend all the rest
      if pdu.error? && pdu.errindex == i + 1
        oidlist.pop  # remove the bad oid
        debug "caught error"
        if pdu.varbinds.size > i+1
          # recram rest of oids on list
          ((i+1)..pdu.varbinds.size).each do |j|
            debug "j = #{j}"
            debug "adding #{j} = #{prev_list[j]}"
            oidlist << prev_list[j]
          end
          # delete failing oid from base_list
          base_list.delete_at(i)
        end
        break
      end
    end
  end
  if block_given?
    yield all_results
  end
  all_results
end