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Handle persisting objects with circular refs in context

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Nick O'Leary 2018-08-15 10:19:37 +01:00
parent 36e3bfffb4
commit ef8b936069
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GPG Key ID: 4F2157149161A6C9
2 changed files with 33 additions and 3 deletions
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33
red/runtime/nodes/context/localfilesystem.js
View File

@ -48,9 +48,12 @@
var fs = require('fs-extra');
var path = require("path");
var util = require("../../util");
var log = require("../../log");
var safeJSONStringify = require("json-stringify-safe");
var MemoryStore = require("./memory");
function getStoragePath(storageBaseDir, scope) {
if(scope.indexOf(":") === -1){
if(scope === "global"){
@ -118,6 +121,12 @@ function listFiles(storagePath) {
}).then(dirs => dirs.reduce((acc, val) => acc.concat(val), []));
}
function stringify(value) {
var hasCircular;
var result = safeJSONStringify(value,null,4,function(k,v){hasCircular = true})
return { json: result, circular: hasCircular };
}
function LocalFileSystem(config){
this.config = config;
this.storageBaseDir = getBasePath(this.config);
@ -125,6 +134,8 @@ function LocalFileSystem(config){
this.cache = MemoryStore({});
}
this.pendingWrites = {};
this.knownCircularRefs = {};
if (config.hasOwnProperty('flushInterval')) {
this.flushInterval = Math.max(0,config.flushInterval) * 1000;
} else {
@ -172,7 +183,15 @@ LocalFileSystem.prototype.open = function(){
scopes.forEach(function(scope) {
var storagePath = getStoragePath(self.storageBaseDir,scope);
var context = newContext[scope];
promises.push(fs.outputFile(storagePath + ".json", JSON.stringify(context, undefined, 4), "utf8"));
var stringifiedContext = stringify(context);
if (stringifiedContext.circular && !self.knownCircularRefs[scope]) {
log.warn("Context "+scope+" contains a circular reference that cannot be persisted");
self.knownCircularRefs[scope] = true;
} else {
delete self.knownCircularRefs[scope];
}
log.debug("Flushing localfilesystem context scope "+scope);
promises.push(fs.outputFile(storagePath + ".json", stringifiedContext.json, "utf8"));
});
delete self._pendingWriteTimeout;
return Promise.all(promises);
@ -221,6 +240,7 @@ LocalFileSystem.prototype.get = function(scope, key, callback) {
};
LocalFileSystem.prototype.set = function(scope, key, value, callback) {
var self = this;
var storagePath = getStoragePath(this.storageBaseDir ,scope);
if (this.cache) {
this.cache.set(scope,key,value,callback);
@ -229,7 +249,6 @@ LocalFileSystem.prototype.set = function(scope, key, value, callback) {
// there's a pending write which will handle this
return;
} else {
var self = this;
this._pendingWriteTimeout = setTimeout(function() { self._flushPendingWrites.call(self)}, this.flushInterval);
}
} else if (callback && typeof callback !== 'function') {
@ -251,7 +270,14 @@ LocalFileSystem.prototype.set = function(scope, key, value, callback) {
}
util.setObjectProperty(obj,key[i],v);
}
return fs.outputFile(storagePath + ".json", JSON.stringify(obj, undefined, 4), "utf8");
var stringifiedContext = stringify(obj);
if (stringifiedContext.circular && !self.knownCircularRefs[scope]) {
log.warn("Context "+scope+" contains a circular reference that cannot be persisted");
self.knownCircularRefs[scope] = true;
} else {
delete self.knownCircularRefs[scope];
}
return fs.outputFile(storagePath + ".json", stringifiedContext.json, "utf8");
}).then(function(){
if(typeof callback === "function"){
callback(null);
@ -308,6 +334,7 @@ LocalFileSystem.prototype.clean = function(_activeNodes) {
} else {
cachePromise = Promise.resolve();
}
this.knownCircularRefs = {};
return cachePromise.then(() => listFiles(self.storageBaseDir)).then(function(files) {
var promises = [];
files.forEach(function(file) {

3
test/red/runtime/nodes/context/localfilesystem_spec.js
View File

@ -46,9 +46,12 @@ describe('localfilesystem',function() {
it('should store property',function(done) {
context.get("nodeX","foo",function(err, value){
if (err) { return done(err); }
should.not.exist(value);
context.set("nodeX","foo","test",function(err){
if (err) { return done(err); }
context.get("nodeX","foo",function(err, value){
if (err) { return done(err); }
value.should.be.equal("test");
done();
});