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var debug = require('debug')('algoliasearch:src/hostIndexState.js');
var localStorageNamespace = 'algoliasearch-client-js';
var store;
var moduleStore = {
state: {},
set: function(key, data) {
this.state[key] = data;
return this.state[key];
},
get: function(key) {
return this.state[key] || null;
}
};
var localStorageStore = {
set: function(key, data) {
moduleStore.set(key, data); // always replicate localStorageStore to moduleStore in case of failure
try {
var namespace = JSON.parse(global.localStorage[localStorageNamespace]);
namespace[key] = data;
global.localStorage[localStorageNamespace] = JSON.stringify(namespace);
return namespace[key];
} catch (e) {
return localStorageFailure(key, e);
}
},
get: function(key) {
try {
return JSON.parse(global.localStorage[localStorageNamespace])[key] || null;
} catch (e) {
return localStorageFailure(key, e);
}
}
};
function localStorageFailure(key, e) {
debug('localStorage failed with', e);
cleanup();
store = moduleStore;
return store.get(key);
}
store = supportsLocalStorage() ? localStorageStore : moduleStore;
module.exports = {
get: getOrSet,
set: getOrSet,
supportsLocalStorage: supportsLocalStorage
};
function getOrSet(key, data) {
if (arguments.length === 1) {
return store.get(key);
}
return store.set(key, data);
}
function supportsLocalStorage() {
try {
if ('localStorage' in global &&
global.localStorage !== null) {
if (!global.localStorage[localStorageNamespace]) {
// actual creation of the namespace
global.localStorage.setItem(localStorageNamespace, JSON.stringify({}));
}
return true;
}
return false;
} catch (_) {
return false;
}
}
// In case of any error on localStorage, we clean our own namespace, this should handle
// quota errors when a lot of keys + data are used
function cleanup() {
try {
global.localStorage.removeItem(localStorageNamespace);
} catch (_) {
// nothing to do
}
}
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