node-nlp
Version:
Library for NLU (Natural Language Understanding) done in Node.js
51 lines • 2.15 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const botState_1 = require("./botState");
const NO_KEY = `ConversationState: channelId and/or conversation missing from context.request.`;
/**
* Reads and writes conversation state for your bot to storage.
*
* @remarks
* Each conversation your bot has with a user or group will have its own isolated storage object
* that can be used to persist conversation tracking information between turns of the conversation.
* This state information can be reset at any point by calling [clear()](#clear).
*
* ```JavaScript
* const { ConversationState, MemoryStorage } = require('botbuilder');
*
* const conversationState = new ConversationState(new MemoryStorage());
* ```
*/
class ConversationState extends botState_1.BotState {
/**
* Creates a new ConversationState instance.
* @param storage Storage provider to persist conversation 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 conversation state.
* @param context Context for current turn of conversation with the user.
*/
getStorageKey(context) {
const activity = context.activity;
const channelId = activity.channelId;
const conversationId = activity && activity.conversation && activity.conversation.id ? activity.conversation.id : undefined;
if (!channelId) {
throw new Error('missing activity.channelId');
}
if (!conversationId) {
throw new Error('missing activity.conversation.id');
}
return `${channelId}/conversations/${conversationId}/${this.namespace}`;
}
}
exports.ConversationState = ConversationState;
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