node-nlp
Version:
Library for NLU (Natural Language Understanding) done in Node.js
50 lines • 1.91 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const botState_1 = require("./botState");
const NO_KEY = `UserState: channelId and/or conversation missing from context.request.`;
/**
* Reads and writes user state for your bot to storage.
*
* @remarks
* Each user your bot communicates with will have its own isolated storage object that can be used
* to persist information about the user across all of the conversation you have with that user.
*
* ```JavaScript
* const { UserState, MemoryStorage } = require('botbuilder');
*
* const userState = new UserState(new MemoryStorage());
* ```
*/
class UserState extends botState_1.BotState {
/**
* Creates a new UserState instance.
* @param storage Storage provider to persist user state to.
* @param namespace (Optional) namespace to append to storage keys. Defaults to an empty string.
*/
constructor(storage, namespace = '') {
super(storage, (context) => {
// Calculate storage key
const key = this.getStorageKey(context);
return key ? Promise.resolve(key) : Promise.reject(new Error(NO_KEY));
});
this.namespace = namespace;
}
/**
* Returns the storage key for the current user state.
* @param context Context for current turn of conversation with the user.
*/
getStorageKey(context) {
const activity = context.activity;
const channelId = activity.channelId;
const userId = activity && activity.from && activity.from.id ? activity.from.id : undefined;
if (!channelId) {
throw new Error('missing activity.channelId');
}
if (!userId) {
throw new Error('missing activity.from.id');
}
return `${channelId}/users/${userId}/${this.namespace}`;
}
}
exports.UserState = UserState;
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