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run-action-curry.js
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run-action-curry.js
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"use strict";
const locreq = require("locreq")(__dirname);
const ActionResultCache = new WeakMap();
function hash_call(subject_path, action_name, params){
const to_map = [subject_path, action_name, params];
return to_map.map(e=>JSON.stringify(e)).reduce((a, b) => a + b);
}
function get_event_name(stage, subject_path, action_name){
return `${stage }:${ subject_path.join(".") }:${ action_name}`;
}
function run_action_curry(app){
return function run_action(context, subject_path, action_name, params){
if(!ActionResultCache.has(context)){
ActionResultCache.set(context, new Map());
}
const hash = hash_call(subject_path, action_name, params);
context.total = context.total + 1 || 1;
if(ActionResultCache.get(context).has(hash)){
context.from_cache = context.from_cache + 1 || 1;
return ActionResultCache.get(context).get(hash);
}else{
let subject = null;
const promise = app.RootSubject.get_subject(subject_path)
.then(function(_subject){
subject = _subject;
const event_name = get_event_name("pre", subject_path, action_name);
return app.emit(event_name, subject_path, params);
})
.then(function(new_params){
if(new_params[0] !== undefined){
params = new_params[0];
}
return subject.perform_action(context, action_name, params);
}).then(function(response){
const event_name = get_event_name("post", subject_path, action_name);
return app.emit(event_name, subject_path, params, response)
.then(function(){
return response;
});
});
if(action_name === "show"){
ActionResultCache.get(context).set(hash, promise);
}
if(action_name !== "show"){
ActionResultCache.delete(context);
}
return promise;
}
};
}
module.exports = run_action_curry;

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