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const mssql = require('mssql');
/**
* Storage for conversation logs
*
* @class
*/
class ChatLogStorage {
/**
*
* @param {Promise<mssql.ConnectionPool>} pool
* @param {{error:Function}} [log] - console like logger
*/
constructor (pool, log = console) {
this._pool = pool;
this._log = log;
this.muteErrors = true;
}
/**
* @returns {Promise<mssql.Table>}
*/
/**
* Interate history
* all limits are inclusive
*
* @param {string} senderId
* @param {string} [pageId] - use null to treat senderId as flag
* @param {number} [limit]
* @param {number} [endAt] - iterate backwards to history
* @param {number} [startAt] - iterate forward to last interaction
*/
async getInteractions (senderId, pageId = null, limit = 10, endAt = null, startAt = null) {
const cp = await this._pool;
const r = cp.request();
const top = limit
? `TOP ${parseInt(`${limit}`, 10)}`
: '';
const forceIndex = pageId
? 'WITH (INDEX(page_sender_timestamp))'
: 'WITH (INDEX(flag))';
let query = `SELECT ${top}
senderId, request, responses, metadata, pageId, timestamp, err
FROM chatlogs ${forceIndex}
WHERE `;
if (pageId) {
query += `senderId=@senderId
AND pageId=@pageId`;
} else {
query += 'flag=@senderId';
}
const orderBackwards = startAt && !endAt;
if (startAt || endAt) {
query += ' AND timestamp BETWEEN @startAt AND @endAt';
r.input('startAt', mssql.BigInt, startAt || 0);
r.input('endAt', mssql.BigInt, endAt || Number.MAX_SAFE_INTEGER);
}
query += ' ORDER BY timestamp';
if (orderBackwards) {
query += ' ASC';
} else {
query += ' DESC';
}
let { recordset } = await r
.input('senderId', mssql.VarChar, senderId)
.input('pageId', mssql.VarChar, pageId)
.query(query);
// @ts-ignore
recordset = recordset.map((o) => {
// eslint-disable-next-line no-param-reassign
o.responses = JSON.parse(o.responses);
// eslint-disable-next-line no-param-reassign
o.request = JSON.parse(o.request);
// eslint-disable-next-line no-param-reassign
o.timestamp = JSON.parse(o.timestamp);
Object.assign(o, JSON.parse(o.metadata));
// eslint-disable-next-line no-param-reassign
delete o.metadata;
if (o.err === null) {
delete o.err; // eslint-disable-line no-param-reassign
}
return o;
});
if (!orderBackwards) {
recordset.reverse();
}
// @ts-ignore
return recordset;
}
/**
* Log single event
*
* @param {string} senderId
* @param {object[]} responses - list of sent responses
* @param {object} request - event request
* @param {object} [metadata] - request metadata
* @returns {Promise}
*/
log (senderId, responses = [], request = {}, metadata = {}) {
const log = {
senderId,
time: new Date(request.timestamp || Date.now()),
request,
responses
};
Object.assign(log, metadata);
const query = `
INSERT INTO chatlogs
(senderId, time, request, responses, pageId, metadata, flag, timestamp, err)
VALUES
(@senderId, @time, @request, @responses, @pageId, @metadata, @flag, @timestamp, @err)`;
return this._pool
.then((pool) => pool.request()
.input('senderId', mssql.VarChar, log.senderId)
.input('time', mssql.VarChar, log.time)
.input('request', mssql.NVarChar, JSON.stringify(log.request))
.input('responses', mssql.NVarChar, JSON.stringify(log.responses))
.input('metadata', mssql.NVarChar, JSON.stringify(metadata))
.input('flag', mssql.VarChar, typeof metadata.flag === 'string' ? metadata.flag : null)
.input('pageId', mssql.VarChar, log.pageId || null)
.input('timestamp', mssql.VarChar, log.timestamp || null)
.input('err', mssql.VarChar, log.err || null)
.query(query))
.catch((err) => {
this._log.error('Failed to store chat log', err, log);
if (!this.muteErrors) {
throw err;
}
});
}
/**
* Log single event
*
* @method
* @name ChatLog#error
* @param {any} err - error
* @param {string} senderId
* @param {object[]} [responses] - list of sent responses
* @param {object} [request] - event request
* @param {object} [metadata] - request metadata
* @returns {Promise}
*/
error (err, senderId, responses = [], request = {}, metadata = {}) {
let saveError;
try {
saveError = `${err}`.trim().substr(0, 73);
} catch (e) {
saveError = `${err.message || 'unknown error'}`.substr(0, 73);
}
const log = {
senderId,
time: new Date(request.timestamp || Date.now()),
request,
responses,
err: saveError
};
Object.assign(log, metadata);
const query = `INSERT INTO chatlogs
(senderId, time, request, responses, pageId, metadata, flag, timestamp, err)
VALUES
(@senderId, @time, @request, @responses, @pageId, @metadata, @flag, @timestamp, @err)`;
return this._pool
.then((pool) => pool.request()
.input('senderId', mssql.VarChar, log.senderId)
.input('time', mssql.VarChar, log.time)
.input('request', mssql.NVarChar, JSON.stringify(log.request))
.input('responses', mssql.NVarChar, JSON.stringify(log.responses))
.input('metadata', mssql.NVarChar, JSON.stringify(metadata))
.input('flag', mssql.VarChar, typeof metadata.flag === 'string' ? metadata.flag : null)
.input('pageId', mssql.VarChar, log.pageId || null)
.input('timestamp', mssql.VarChar, log.timestamp || null)
.input('err', mssql.VarChar, log.err || null)
.query(query))
.catch((storeError) => {
this._log.error('Failed to store chat log', storeError, log);
if (!this.muteErrors) {
throw storeError;
}
});
}
}
module.exports = ChatLogStorage;
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