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helper methods in versioned store
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mrjvs
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commit
7096e544f4
@ -32,7 +32,6 @@ version 0
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}
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*/
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// TODO implement the store into the rest of the codebase
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export const VideoProgressStore = versionedStoreBuilder()
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.setKey('video-progress')
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.addVersion({
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@ -1,90 +1,109 @@
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function buildStoreObject(data) {
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return {
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versions: data.versions,
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currentVersion: data.maxVersion,
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id: data.storageString,
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update(obj) {
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if (!obj)
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throw new Error("object to update is not an object");
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// repeat until object fully updated
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while (obj["--version"] !== this.currentVersion) {
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// get version
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let version = obj["--version"] || 0;
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if (version.constructor !== Number || version < 0)
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version = -42; // invalid on purpose so it will reset
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else {
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version = (version+1).toString()
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}
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// check if version exists
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if (!this.versions[version]) {
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console.error(`Version not found for storage item in store ${this.id}, resetting`);
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obj = null;
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break;
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}
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// update object
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obj = this.versions[version].update(obj);
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console.log(obj);
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}
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// if resulting obj is null, use latest version as init object
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if (obj === null) {
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console.error(`Storage item for store ${this.id} has been reset due to faulty updates`);
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return this.versions[this.currentVersion.toString()].init();
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}
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// updates succesful, return
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return obj;
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},
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/*
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* get a instance of a stored item
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* will be migrated to the latest version on fetch
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* call .save() on it put the new modified data back
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*/
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get() {
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// get from storage api
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const store = this;
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let data = localStorage.getItem(this.id);
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// parse json if item exists
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if (data) {
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try {
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data = JSON.parse(data);
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if (!data.constructor) {
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console.error(`Storage item for store ${this.id} has not constructor`)
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throw new Error("storage item has no constructor")
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}
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if (data.constructor !== Object) {
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console.error(`Storage item for store ${this.id} is not an object`)
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throw new Error("storage item is not an object")
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}
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} catch (_) {
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// if errored, set to null so it generates new one, see below
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console.error(`Failed to parse storage item for store ${this.id}`)
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data = null;
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}
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}
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// if item doesnt exist, generate from version init
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if (!data) {
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data = this.versions[this.currentVersion.toString()].init();
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}
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// update the data if needed
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data = this.update(data);
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// add a save object to return value
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data.save = function save() {
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localStorage.setItem(store.id, JSON.stringify(data));
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}
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// return data
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return data;
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}
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function buildStoreObject(d) {
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const data = {
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versions: d.versions,
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currentVersion: d.maxVersion,
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id: d.storageString,
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}
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function update(obj) {
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if (!obj)
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throw new Error("object to update is not an object");
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// repeat until object fully updated
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if (obj["--version"] === undefined)
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obj["--version"] = 0;
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while (obj["--version"] !== this.currentVersion) {
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// get version
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let version = obj["--version"] || 0;
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if (version.constructor !== Number || version < 0)
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version = -42; // invalid on purpose so it will reset
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else {
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version = (version+1).toString()
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}
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console.log(this, version);
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// check if version exists
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if (!this.versions[version]) {
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console.error(`Version not found for storage item in store ${this.id}, resetting`);
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obj = null;
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break;
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}
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// update object
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obj = this.versions[version].update(obj);
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console.log(obj);
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}
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// if resulting obj is null, use latest version as init object
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if (obj === null) {
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console.error(`Storage item for store ${this.id} has been reset due to faulty updates`);
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return this.versions[this.currentVersion.toString()].init();
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}
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// updates succesful, return
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return obj;
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}
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function get() {
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// get from storage api
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const store = this;
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let data = localStorage.getItem(this.id);
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// parse json if item exists
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if (data) {
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try {
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data = JSON.parse(data);
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if (!data.constructor) {
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console.error(`Storage item for store ${this.id} has not constructor`)
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throw new Error("storage item has no constructor")
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}
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if (data.constructor !== Object) {
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console.error(`Storage item for store ${this.id} is not an object`)
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throw new Error("storage item is not an object")
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}
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} catch (_) {
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// if errored, set to null so it generates new one, see below
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console.error(`Failed to parse storage item for store ${this.id}`)
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data = null;
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}
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}
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// if item doesnt exist, generate from version init
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if (!data) {
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data = this.versions[this.currentVersion.toString()].init();
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}
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// update the data if needed
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data = this.update(data);
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// add a save object to return value
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data.save = function save() {
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localStorage.setItem(store.id, JSON.stringify(data));
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}
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// add instance helpers
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Object.entries(d.instanceHelpers).forEach(([name, helper]) => {
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if (data[name] !== undefined)
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throw new Error(`helper name: ${name} on instance of store ${this.id} is reserved`)
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data[name] = helper.bind(data);
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})
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// return data
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return data;
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}
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// add functions to store
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data.get = get.bind(data);
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data.update = update.bind(data);
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// add static helpers
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Object.entries(d.staticHelpers).forEach(([name, helper]) => {
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if (data[name] !== undefined)
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throw new Error(`helper name: ${name} on store ${data.id} is reserved`)
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data[name] = helper.bind({});
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})
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return data;
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}
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/*
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@ -99,6 +118,8 @@ export function versionedStoreBuilder() {
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maxVersion: 0,
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versions: {},
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storageString: null,
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instanceHelpers: {},
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staticHelpers: {},
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},
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/*
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@ -147,6 +168,38 @@ export function versionedStoreBuilder() {
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return this;
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},
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/*
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* register a instance or static helper to the store
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*
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* name: name of the helper function
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* helper: function to execute, the 'this' context is the current storage item (type is instance)
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* type: "instance" or "static". instance is put on the storage item when you store.get() it, static is on the store
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*/
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registerHelper({ name, helper, type }) {
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// type
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if (!type)
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type = "instance"
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// input checking
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if (!name || name.constructor !== String) {
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throw new Error("helper name is not a string")
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}
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if (!helper || helper.constructor !== Function) {
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throw new Error("helper function is not a function")
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}
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if (!["instance", "static"].includes(type)) {
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throw new Error("helper type must be either 'instance' or 'static'")
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}
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// register helper
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if (type === "instance")
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this._data.instanceHelpers[name] = helper
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else if (type === "static")
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this._data.staticHelpers[name] = helper
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return this;
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},
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/*
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* returns function store based on what has been set
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*/
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