bsw@1071: -- generate a ready-to-use list of the configures LDAP servers
bsw@1071: -- --------------------------------------------------------------------------
bsw@1071: -- result is in order of preference, including a round robin style random
bsw@1071: -- selection of the preference of hosts with the same preference
bsw@1071: --
bsw@1071: -- returns:
bsw@1071: --   hostlist: flattened list of LDAP servers in order of preference
bsw@1071: 
bsw@1071: function ldap.get_hosts()
bsw@1071:   
bsw@1071:   math.randomseed(os.time())
bsw@1071:   
bsw@1071:   local hostlist = {}
bsw@1071:   
bsw@1071:   -- iterate through all entries on base level
bsw@1071:   for i, host in ipairs (config.ldap.hosts) do
bsw@1071:     
bsw@1071:     -- a single host entry
bsw@1071:     if host.uri then
bsw@1071:       hostlist[#hostlist+1] = host
bsw@1071:       
bsw@1071:     -- or a list of host entries
bsw@1071:     else
bsw@1071:       local subhostlist = {}
bsw@1071:       
bsw@1071:       -- sort list of host entries by random
bsw@1071:       for j, subhost in ipairs(host) do
bsw@1071:         subhost.priority = math.random()
bsw@1071:         subhostlist[#subhostlist+1] = subhost
bsw@1071:       end
bsw@1071:       table.sort(subhostlist, function (a,b)
bsw@1071:         return a.priority < b.priority
bsw@1071:       end)
bsw@1071:       
bsw@1071:       -- and add them to the main list
bsw@1071:       for i, subhost in ipairs(subhostlist) do
bsw@1071:         hostlist[#hostlist+1] = subhost
bsw@1071:       end
bsw@1071:       
bsw@1071:     end
bsw@1071:     
bsw@1071:   end
bsw@1071:   
bsw@1071:   return hostlist
bsw@1071:   
bsw@1071: end