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casti_ctrl_t.js
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casti_ctrl_t.js
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// system dependancies
var sys = require('sys');
// local dependancies
var project_path= "..";
var neoip_rpc = require(project_path+'/lib/neoip_rpc_node');
var equiv = require(project_path+'/vendor/node-helpers/equiv').equiv;
/**
*/
var casti_ctrl_t = function(ctor_opts){
//////////////////////////////////////////////////////////////////////////
// class variables //
//////////////////////////////////////////////////////////////////////////
// alias 'this' for this object, to self
var self = this;
// copy ctor_opts + set default values if needed
var call_url = ctor_opts.call_url || console.assert(false);
var casti_opts = ctor_opts.casti_opts || console.assert(false);
var event_cb = ctor_opts.event_cb || function(event_type, event_data){}
var req_timer_delay = ctor_opts.req_timer_delay || 0.5*1000;
var verbose = ctor_opts.verbose || 0;
// private methods
var cast_privhash = null;
//////////////////////////////////////////////////////////////////////////
// ctor/dtor //
//////////////////////////////////////////////////////////////////////////
var ctor = function(){
rpc_call_request();
}
var dtor = function(){
// destroy pending rpc_call if needed
rpc_call_destroy();
// stop the req_timer if needed
req_timer_stop();
}
//////////////////////////////////////////////////////////////////////////
// misc //
//////////////////////////////////////////////////////////////////////////
var start_release = function(){
// destroy pending rpc_call if needed
rpc_call_destroy();
// stop the req_timer if needed
req_timer_stop();
// launch_rpc_call_release
rpc_call_release();
}
//////////////////////////////////////////////////////////////////////////
// req_timer //
//////////////////////////////////////////////////////////////////////////
var req_timer_id = null;
var req_timer_start = function(delay){
// if not specified, set delay to default value
if( delay == undefined ) delay = req_timer_delay;
console.assert(req_timer_id === null);
req_timer_id = setTimeout(req_timer_cb, delay);
}
var req_timer_stop = function(){
if( req_timer_id !== null ) clearTimeout(req_timer_id);
req_timer_id = null;
}
var req_timer_refresh = function(){
req_timer_stop();
req_timer_start();
}
var req_timer_cb = function(){
if( verbose > 1 ) console.log("req_timer expired. next in "+req_timer_delay+"-msec");
rpc_call_request();
}
//////////////////////////////////////////////////////////////////////////
// rpc_call //
//////////////////////////////////////////////////////////////////////////
var rpc_call = null;
var rpc_call_request = function(){
// log to debug
if( verbose > 1 ) console.log("rpc: rpc_call_request enter")
// sanity check
console.assert(rpc_call === null);
// create the neoip_rpc.call
var co = casti_opts;
rpc_call = neoip_rpc.rpc_call.create({
call_url : call_url,
method_name : 'request_stream',
method_args : [co.mdata_srv_uri, co.cast_name, co.cast_privtext, co.scasti_uri
, co.scasti_mod, co.http_peersrc_uri, co.web2srv_str],
success_cb : function(returned_val){
rpc_call_destroy();
req_timer_refresh();
if(returned_val.length > 0){
// mark this cast as "published"
cast_privhash = returned_val;
notify_event("ispublished", {cast_privhash: returned_val});
}else{
// mark this cast as "not published"
cast_privhash = null;
notify_event("nopublished", null);
}
},
failure_cb : function(fault){
// mark this cast as "not published"
cast_privhash = null;
if( verbose ) console.log("failure: "+require('sys').inspect(fault));
rpc_call_destroy();
notify_event("rpc_error", null);
}
});
}
var rpc_call_release = function(){
// log to debug
if( verbose > 1 ) console.log("rpc: rpc_call_release enter")
// sanity check
console.assert(rpc_call === null);
// mark this cast as "not published"
cast_privhash = null;
// create the neoip_rpc.call
var co = casti_opts;
rpc_call = neoip_rpc.rpc_call.create({
call_url : call_url,
method_name : 'release_stream',
method_args : [co.mdata_srv_uri, co.cast_name, co.cast_privtext],
success_cb : function(returned_val){
rpc_call_destroy();
notify_event("released", null);
},
failure_cb : function(fault){
if( verbose ) console.log("failure: "+require('sys').inspect(fault));
rpc_call_destroy();
notify_event("rpc_error", null);
}
});
}
var rpc_call_destroy = function(){
if( rpc_call !== null ) rpc_call.destroy();
rpc_call = null;
}
//////////////////////////////////////////////////////////////////////////
// notify_event //
//////////////////////////////////////////////////////////////////////////
var last_event_type = null;
var last_event_data = null;
var notify_event = function(event_type, event_data){
// return if current event is equal to last event
if( event_type == last_event_type && equiv(event_data, last_event_data) )
return;
// backup current event_type/event_data
last_event_data = event_data;
last_event_type = event_type;
// do notify the event_cb
event_cb(event_type, event_data);
}
//////////////////////////////////////////////////////////////////////////
// run initialisation //
//////////////////////////////////////////////////////////////////////////
// call the contructor
ctor();
// return the public properties
return {
release : start_release,
published : function(){ return cast_privhash !== null },
cast_privhash : function(){ return cast_privhash; },
destroy : dtor
}
}
/**
* Class method to create an object
* - thus avoid new operator
*/
casti_ctrl_t.create = function(ctor_opts){
return new casti_ctrl_t(ctor_opts);
}
// export it via commonjs
exports.create = casti_ctrl_t.create;