Broken Concurrency in Webworker with multiple stores / never Ready()

[disarticulate]

test case:

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d=a.name?new va(function(b){b(a.storeName?ea(a,e._defaultConfig):a.name+"/")}).then(function(a){for(var b=localStorage.length-1;b>=0;b--){var c=localStorage.key(b);0===c.indexOf(a)&&localStorage.removeItem(c)}}):va.reject("Invalid arguments"),h(d,b),d}function ra(a,b){a[b]=function(){var c=arguments;return a.ready().then(function(){return a[b].apply(a,c)})}}function sa(){for(var a=1;a<arguments.length;a++){var b=arguments[a];if(b)for(var c in b)b.hasOwnProperty(c)&&($a(b[c])?arguments[0][c]=b[c].slice():arguments[0][c]=b[c])}return arguments[0]}var ta="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(a){return typeof a}:function(a){return a&&"function"==typeof Symbol&&a.constructor===Symbol&&a!==Symbol.prototype?"symbol":typeof a},ua=e();"undefined"==typeof Promise&&a(3);var va=Promise,wa="local-forage-detect-blob-support",xa=void 0,ya={},za=Object.prototype.toString,Aa="readonly",Ba="readwrite",Ca={_driver:"asyncStorage",_initStorage:C,_support:f(),iterate:E,getItem:D,setItem:F,removeItem:G,clear:H,length:I,key:J,keys:K,dropInstance:L},Da="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",Ea="~~local_forage_type~",Fa=/^~~local_forage_type~([^~]+)~/,Ga="__lfsc__:",Ha=Ga.length,Ia="arbf",Ja="blob",Ka="si08",La="ui08",Ma="uic8",Na="si16",Oa="si32",Pa="ur16",Qa="ui32",Ra="fl32",Sa="fl64",Ta=Ha+Ia.length,Ua=Object.prototype.toString,Va={serialize:P,deserialize:Q,stringToBuffer:N,bufferToString:O},Wa={_driver:"webSQLStorage",_initStorage:S,_support:M(),iterate:V,getItem:U,setItem:X,removeItem:Y,clear:Z,length:$,key:_,keys:aa,dropInstance:ca},Xa={_driver:"localStorageWrapper",_initStorage:ha,_support:da(),iterate:ka,getItem:ja,setItem:pa,removeItem:oa,clear:ia,length:na,key:la,keys:ma,dropInstance:qa},Ya=function(a,b){return a===b||"number"==typeof a&&"number"==typeof b&&isNaN(a)&&isNaN(b)},Za=function(a,b){for(var c=a.length,d=0;d<c;){if(Ya(a[d],b))return!0;d++}return!1},$a=Array.isArray||function(a){return"[object Array]"===Object.prototype.toString.call(a)},_a={},ab={},bb={INDEXEDDB:Ca,WEBSQL:Wa,LOCALSTORAGE:Xa},cb=[bb.INDEXEDDB._driver,bb.WEBSQL._driver,bb.LOCALSTORAGE._driver],db=["dropInstance"],eb=["clear","getItem","iterate","key","keys","length","removeItem","setItem"].concat(db),fb={description:"",driver:cb.slice(),name:"localforage",size:4980736,storeName:"keyvaluepairs",version:1},gb=function(){function a(b){d(this,a);for(var c in bb)if(bb.hasOwnProperty(c)){var e=bb[c],f=e._driver;this[c]=f,_a[f]||this.defineDriver(e)}this._defaultConfig=sa({},fb),this._config=sa({},this._defaultConfig,b),this._driverSet=null,this._initDriver=null,this._ready=!1,this._dbInfo=null,this._wrapLibraryMethodsWithReady(),this.setDriver(this._config.driver).catch(function(){})}return a.prototype.config=function(a){if("object"===(void 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Error("No available storage method found.");return g._driverSet=va.reject(h),g._driverSet}var c=0;return b()}}var g=this;$a(a)||(a=[a]);var h=this._getSupportedDrivers(a),j=null!==this._driverSet?this._driverSet.catch(function(){return va.resolve()}):va.resolve();return this._driverSet=j.then(function(){var a=h[0];return g._dbInfo=null,g._ready=null,g.getDriver(a).then(function(a){g._driver=a._driver,d(),g._wrapLibraryMethodsWithReady(),g._initDriver=f(h)})}).catch(function(){d();var a=new Error("No available storage method found.");return g._driverSet=va.reject(a),g._driverSet}),i(this._driverSet,b,c),this._driverSet},a.prototype.supports=function(a){return!!ab[a]},a.prototype._extend=function(a){sa(this,a)},a.prototype._getSupportedDrivers=function(a){for(var b=[],c=0,d=a.length;c<d;c++){var e=a[c];this.supports(e)&&b.push(e)}return b},a.prototype._wrapLibraryMethodsWithReady=function(){for(var a=0,b=eb.length;a<b;a++)ra(this,eb[a])},a.prototype.createInstance=function(b){return new a(b)},a}(),hb=new gb;b.exports=hb},{3:3}]},{},[4])(4)});
localforage.config({driver:localforage.INDEXEDDB,name:'service-worker',version:1.0,size:4980736,storeName:'service_worker',description:'stores service worker data'})
  self.onmessage = async (e) => {
    const fileCache = localforage.createInstance({
      name: 'fileCache' ,
      storeName: 'filename' + e.data.msg,
      description: 'Packet Buffer'
    })
    let key = 'test' + e.data.msg
    self.postMessage('got:' + key)
    let data = await fileCache.setItem(key, e.data)
    self.postMessage('set:' + key)
  };
  // Rest of your worker code goes here.
</script>
<script>
  var blob = new Blob([
    document.querySelector('#worker1').textContent
  ], { type: "text/javascript" })

  var worker1 = new Worker(window.URL.createObjectURL(blob))
  worker1.onmessage = function(e) {
    console.log("Received: " + e.data)
  }
  worker1.postMessage({ msg: "hello1", data: new Uint8Array(16000) })

  var worker2 = new Worker(window.URL.createObjectURL(blob))
  worker2.onmessage = function(e) {
    console.log("Received: " + e.data)
  }
  worker2.postMessage({ msg: "hello2", data: new Uint8Array(16000) })

  var worker3 = new Worker(window.URL.createObjectURL(blob))
  worker3.onmessage = function(e) {
    console.log("Received: " + e.data)
  }
  worker3.postMessage({ msg: "hello3", data: new Uint8Array(16000) })

  var worker4 = new Worker(window.URL.createObjectURL(blob))
  worker4.onmessage = function(e) {
    console.log("Received: " + e.data)
  }
  worker4.postMessage({ msg: "hello4", data: new Uint8Array(16000) })
  worker3.postMessage({ msg: "hello3-1", data: new Uint8Array(16000) })
  worker3.postMessage({ msg: "hello3-2", data: new Uint8Array(16000) })
  worker1.postMessage({ msg: "hello1-1", data: new Uint8Array(16000) })
  worker2.postMessage({ msg: "hello2-1", data: new Uint8Array(16000) })
  worker1.postMessage({ msg: "hello1-1", data: new Uint8Array(16000) })
  worker1.postMessage({ msg: "hello1-2", data: new Uint8Array(16000) })
  worker1.postMessage({ msg: "hello1-3", data: new Uint8Array(16000) })
</script>

Chromium Version 87.0.4280.88 (Official Build) snap (64-bit)
console:

test.localforage.html:43 Received: got:testhello1
test.localforage.html:55 Received: got:testhello3
2test.localforage.html:43 Received: got:testhello1-1
test.localforage.html:55 Received: got:testhello3-1
test.localforage.html:61 Received: got:testhello4
test.localforage.html:55 Received: got:testhello3-2
test.localforage.html:43 Received: got:testhello1-2
test.localforage.html:43 Received: got:testhello1-3
test.localforage.html:49 Received: got:testhello2
test.localforage.html:49 Received: got:testhello2-1
test.localforage.html:49 Received: set:testhello2
test.localforage.html:49 Received: set:testhello2-1

Ubuntu Firefox Version 84.0 (64-bit)

Received: got:testhello4 test.localforage.html:61:13
Received: got:testhello3 test.localforage.html:55:13
Received: got:testhello1 test.localforage.html:43:13
Received: got:testhello3-1 test.localforage.html:55:13
Received: got:testhello3-2 test.localforage.html:55:13
Received: got:testhello1-1 test.localforage.html:43:13
Received: got:testhello2 test.localforage.html:49:13
Received: got:testhello1-1 test.localforage.html:43:13
Received: got:testhello1-2 test.localforage.html:43:13
Received: got:testhello1-3 test.localforage.html:43:13
Received: got:testhello2-1 test.localforage.html:49:13

Bug Use Case (it's not a feature): A receiving file cache where webworkers get multi part files (via broken Webrtc file send limit) to rebuild

maybe related to #991 as it appears that data is actually set via inspection of application/indexDb but the ready() promise is never fulfilled (as describe din the API, we're not suppose to need ot check ready).

[disarticulate]

pull request here for tests: #1009

digging around, it looks like there's an upgradeneeded request that's blocked leading to the hang:

function _getConnection(dbInfo, upgradeNeeded) {
    return new Promise$1(function (resolve, reject) {
        dbContexts[dbInfo.name] = dbContexts[dbInfo.name] || createDbContext();

        if (dbInfo.db) {
            if (upgradeNeeded) {
                _deferReadiness(dbInfo);
                dbInfo.db.close();
                console.log('dbInfo.db:close', dbInfo.storeName)
            } else {
                return resolve(dbInfo.db);
            }
        }

        var dbArgs = [dbInfo.name];

        if (upgradeNeeded) {
            dbArgs.push(dbInfo.version);
        }

        var openreq = idb.open.apply(idb, dbArgs);

        if (upgradeNeeded) {
            openreq.onupgradeneeded = function (e) {
                var db = openreq.result;
                try {
                    var objectStore = db.createObjectStore(dbInfo.storeName);

                    console.log('openreq:objectStore', dbInfo.storeName, objectStore)
                    if (e.oldVersion <= 1) {
                        // Added when support for blob shims was added
                        db.createObjectStore(DETECT_BLOB_SUPPORT_STORE);
                    }
                } catch (ex) {
                    if (ex.name === 'ConstraintError') {
                        console.warn('The database "' + dbInfo.name + '"' + ' has been upgraded from version ' + e.oldVersion + ' to version ' + e.newVersion + ', but the storage "' + dbInfo.storeName + '" already exists.');
                    } else {
                        throw ex;
                    }
                }
            };
        }
        // two concurrent requests to upgrade (or more) will block.
        // this block generates a IDBVersionChangeEvent](https://developer.mozilla.org/en-US/docs/Web/API/IDBVersionChangeEvent)
        openreq.onblocked = function (e) {
          console.log('openreq:onblocked', dbInfo.storeName, e)
        }
   {...}
}

I've stared at the code for awhile and can't really understand how to restart the _getConnection it seems like after the if block close, we need to extract a functional while loop.

[disarticulate]

further investigation seems to indicates there's atleast two issues going on.

There's definitely the onblock concurrency needing to be handled, but there's also this versioning:

function _isUpgradeNeeded(dbInfo, defaultVersion) {
    if (!dbInfo.db) {
        return true;
    }

    var isNewStore = !dbInfo.db.objectStoreNames.contains(dbInfo.storeName);
    var isDowngrade = dbInfo.version < dbInfo.db.version;
    var isUpgrade = dbInfo.version > dbInfo.db.version;

    if (isDowngrade) {
        // If the version is not the default one
        // then warn for impossible downgrade.
        if (dbInfo.version !== defaultVersion) {
            console.warn('The database "' + dbInfo.name + '"' + " can't be downgraded from version " + dbInfo.db.version + ' to version ' + dbInfo.version + '.');
        }
        // Align the versions to prevent errors.
        dbInfo.version = dbInfo.db.version;
    }

    if (isUpgrade || isNewStore) {
        // If the store is new then increment the version (if needed).
        // This will trigger an "upgradeneeded" event which is required
        // for creating a store.
        if (isNewStore) {
            var incVersion = dbInfo.db.version + 1;
            if (incVersion > dbInfo.version) {
                dbInfo.version = incVersion;
            }
        }

        return true;
    }

    return false;
}

it does not appear to handle concurrency

[tofumatt]

I'm a bit behind on localForage issues but I'll admit that web worker support is not something a lot of users tend to use so that might be why this is buggy.

The new 2.0 rewrite #906 aims to have better database initialisation/ready handlers, but aside from that I'm honestly not sure off the top of my head what's wrong here, sorry 🙁

[inf3rnus]

I made a PR that may elucidate some aspect of this issue, I don't have time to get into the nitty gritty
of @disarticulate's original post, but it's extremely close to the issue I was experiencing with a webworker

@disarticulate - Could you test out my change, it's one line of code, I'm curious to see what it does for you?

#1019