anchor.diff:  -include_lib("radius/include/radius.hrl").
   -include("ocs_log.hrl").
   
  +%% support deprecated_time_unit()
  +-define(MILLISECOND, milli_seconds).
  +%-define(MILLISECOND, millisecond).
  +
   -spec content_types_accepted() -> ContentTypes
   	when
   		ContentTypes :: list().
  
positive.code: 
  %% @hidden
  get_acct_query([] = _Query, Filters) ->
  	{ok, _MaxItems} = application:get_env(ocs, rest_page_size),
  	case ocs_log:auth_query(1, 1, '_', '_', '_', '_') of
  		[] ->
  			{error, 404};
  		Events ->
  			JsonObj = usage_aaa_acct(Events, Filters),
  			JsonArray = {array, JsonObj},
  			Body = mochijson:encode(JsonArray),
  			N = integer_to_list(length(Events)),
  			ContentRange = "items 1-" ++ N ++ "/" ++ N,
  			Headers = [{content_type, "application/json"},
  					{content_range, ContentRange}],
  
negative.code: %% 	`GET /usageManagement/v1/usage/{id}'
  %% 	requests.
  get_usage("auth-" ++ _ = Id, [] = _Query) ->
  	{ok, MaxItems} = application:get_env(ocs, rest_page_size),
  	try
  		["auth", TimeStamp, Serial] = string:tokens(Id, [$-]),
  		TS = list_to_integer(TimeStamp),
  		N = list_to_integer(Serial),
  		case query_auth(TS, TS, '_', '_', '_', '_', MaxItems) of
  			{error, _} ->
  				{error, 500};
  			{_, Events} ->
  				case lists:keyfind(N, 2, Events) of
  					Event when is_tuple(Event) ->
  						JsonObj = usage_aaa_auth(Event, []),
  						{struct, Attr} = JsonObj,
  						{_, Date} = lists:keyfind("date", 1, Attr),
  						Body = mochijson:encode(JsonObj),
  						Headers = [{content_type, "application/json"},
  								{last_modified, Date}],
  						{ok, Headers, Body};
  					_ ->
  						{error, 404}
  				end
  		end
  	catch
  		_:_Reason ->
  			{error, 404}
  	end;
  get_usage("acct-" ++ _ = Id, [] = _Query) ->
  	{ok, MaxItems} = application:get_env(ocs, rest_page_size),
  	try
  		["acct", TimeStamp, Serial] = string:tokens(Id, [$-]),
  		TS = list_to_integer(TimeStamp),
  		N = list_to_integer(Serial),
  		case query_acct(TS, TS, '_', '_', '_', MaxItems) of
  			{error, _} ->
  				{error, 500};
  			{_, Events} ->
  				case lists:keyfind(N, 2, Events) of
  					Event when is_tuple(Event) ->
  						JsonObj = usage_aaa_acct(Event, []),
  						{struct, Attr} = JsonObj,
  						{_, Date} = lists:keyfind("date", 1, Attr),
  						Body = mochijson:encode(JsonObj),
  						Headers = [{content_type, "application/json"},
  								{last_modified, Date}],
  						{ok, Headers, Body};
  					_ ->
  						{error, 404}
  				end
  		end
  	catch
  		_:_Reason ->
  			{error, 404}
  get_usage(Id, [] = _Query) ->
  	{ok, MaxItems} = application:get_env(ocs, rest_page_size),
  	{ok, Directory} = application:get_env(ocs, ipdr_log_dir),
  