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-- Gemeinschaft 5 module: call router class
-- (c) AMOOMA GmbH 2013
--
module(...,package.seeall)
Router = {}
-- create route object
function Router.new(self, arg)
arg = arg or {}
object = arg.object or {}
setmetatable(object, self);
self.__index = self;
self.class = 'router';
self.log = arg.log;
self.database = arg.database;
self.routes = arg.routes or {};
self.caller = arg.caller;
self.variables = arg.variables or {};
return object;
end
function Router.read_table(self, table_name)
local routing_table = {};
local sql_query = 'SELECT * \
FROM `call_routes` `a` \
JOIN `route_elements` `b` ON `a`.`id` = `b`.`call_route_id`\
WHERE `a`.`table` = "' .. table_name .. '" \
ORDER BY `a`.`position`, `b`.`position`';
local last_id = 0;
self.database:query(sql_query, function(route)
if last_id ~= tonumber(route.call_route_id) then
last_id = tonumber(route.call_route_id);
table.insert(routing_table, {id = route.call_route_id, name = route.name, endpoint_type = route.endpoint_type , endpoint_id = route.endpoint_id, elements = {} });
end
table.insert(routing_table[#routing_table].elements, {
var_in = route.var_in,
var_out = route.var_out,
pattern = route.pattern,
replacement = route.replacement,
action = route.action,
mandatory = common.str.to_b(route.mandatory),
});
end);
return routing_table;
end
function Router.expand_variables(self, line)
return (line:gsub('{([%a%d_]+)}', function(captured)
return variables[captured] or '';
end))
end
function Router.set_parameter(self, action, name, value)
if action == 'set_session_var' then
self.log:debug('ROUTER_SET_SESSION_VARIABLE - ', name, ' = ', value);
self.caller[name] = value;
elseif action == 'set_channel_var' then
self.log:debug('ROUTER_SET_VARIABLE - ', name, ' = ', value);
self.caller:set_variable(name, value);
elseif action == 'export_channel_var' then
self.log:debug('ROUTER_EXPORT_VARIABLE - ', name, ' = ', value);
self.caller:export_variable(name, value);
elseif action == 'set_header' then
self.log:debug('ROUTER_SIP_HEADER - ', name, ': ', value);
self.caller:export_variable('sip_h_' .. name, value);
else
self.log:error('ROUTER_SET_PARAMERER - unknown action: ', action, ', ', name, ' = ', value);
end
end
function Router.element_match(self, pattern, search_string, replacement)
local variables_list = {};
local success, result = pcall(string.find, search_string, pattern);
if not success then
self.log:error('ELEMENT_MATCH - table error - pattern: ', pattern, ', search_string: ', search_string);
elseif result then
return true, search_string:gsub(pattern, self:expand_variables(replacement, variables_list));
end
return false;
end
function Router.element_match_group(self, pattern, groups, replacement, use_key)
if type(groups) ~= 'table' then
return false;
end
for key, value in pairs(groups) do
if use_key then
value = key;
end
result, replaced_value = self:element_match(pattern, tostring(value), replacement);
if result then
return true, replaced_value;
end
end
end
function Router.route_match(self, route)
local destination = {
gateway = 'gateway' .. route.endpoint_id,
['type'] = route.endpoint_type,
id = route.endpoint_id,
channel_variables = {}
};
local route_matches = false;
for index=1, #route.elements do
local result = false;
local replacement = nil;
local element = route.elements[index];
if element.action ~= 'none' then
local command, variable_name = common.str.partition(element.var_in, ':');
if not command or not variable_name or command == 'var' then
local search_string = tostring(common.str.try(self.caller, element.var_in))
result, replacement = self:element_match(tostring(element.pattern), tostring(search_string), tostring(element.replacement));
elseif command == 'key' or command == 'val' then
local groups = common.str.try(self.caller, variable_name);
result, replacement = self:element_match_group(tostring(element.pattern), groups, tostring(element.replacement), command == 'key');
elseif command == 'chv' then
local search_string = self.caller:to_s(variable_name);
result, replacement = self:element_match(tostring(element.pattern), search_string, tostring(element.replacement));
elseif command == 'hdr' then
local search_string = self.caller:to_s('sip_h_' .. variable_name);
result, replacement = self:element_match(tostring(element.pattern), search_string, tostring(element.replacement));
end
if element.action == 'not_match' then
result = not result;
end
if not result then
if element.mandatory then
return false;
end
else
if not common.str.blank(element.var_out) then
local command, variable_name = common.str.partition(element.var_out, ':');
if not command or not variable_name or command == 'var' then
destination[element.var_out] = replacement;
elseif command == 'chv' then
table.insert(destination.channel_variables, { name = element.var_out, value = replacement });
elseif command == 'hdr' then
table.insert(destination.channel_variables, { name = 'sip_h_' .. tostring(element.var_out), value = replacement });
end
end
if element.action == 'match' or element.action == 'not_match' then
route_matches = true;
end
end
end
end
if route_matches then
return destination;
end;
return nil;
end
function Router.route_run(self, table_name, phone_number, find_first)
local routing_table = self:read_table(table_name);
local routes = {};
if type(routing_table) == 'table' then
for index=1, #routing_table do
local route = self:route_match(routing_table[index], phone_number);
if route then
table.insert(routes, route);
self.log:info('ROUTE ', #routes,' - ', table_name,'=', routing_table[index].id, '/', routing_table[index].name, ', destination: ', route.type, '=', route.id, ', destination_number: ', route.destination_number);
if find_first then
return route;
end
else
self.log:debug('ROUTE_NO_MATCH - ', table_name, '=', routing_table[index].id, '/', routing_table[index].name);
end
end
end
if not find_first then
return routes;
end
end
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