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TDengine

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TDengine
未验证 提交 f0b77fa3 编写于 作者: H Huo Linhe 提交者： GitHub
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[TD-4258]<fix>: speedup nodejs fetchall() with taos_fetch_block (#6165)

上级 4697cdfd
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Showing with 189 addition and 475 deletion
src/connector/nodejs/nodetaos/cursor.js
浏览文件 @ f0b77fa3
const ref = require('ref-napi');
require('./globalfunc.js')
const CTaosInterface = require('./cinterface')
const errors = require ('./error')
const errors = require('./error')
const TaosQuery = require('./taosquery')
const { PerformanceObserver, performance } = require('perf_hooks');
module.exports = TDengineCursor;
......@@ -22,7 +22,7 @@ module.exports = TDengineCursor;
* @property {fields} - Array of the field objects in order from left to right of the latest data retrieved
* @since 1.0.0
*/
function TDengineCursor(connection=null) {
function TDengineCursor(connection = null) {
//All parameters are store for sync queries only.
this._rowcount = -1;
this._connection = null;
......@@ -176,27 +176,22 @@ TDengineCursor.prototype.fetchall = function fetchall(options, callback) {
throw new errors.OperationalError("Invalid use of fetchall, either result or fields from query are null. First execute a query first");
}
let data = [];
let num_of_rows = this._chandle.affectedRows(this._result);
let data = new Array(num_of_rows);
this._rowcount = 0;
//let nodetime = 0;
let time = 0;
const obs = new PerformanceObserver((items) => {
time += items.getEntries()[0].duration;
performance.clearMarks();
});
/*
const obs2 = new PerformanceObserver((items) => {
nodetime += items.getEntries()[0].duration;
performance.clearMarks();
});
obs2.observe({ entryTypes: ['measure'] });
performance.mark('nodea');
*/
obs.observe({ entryTypes: ['measure'] });
performance.mark('A');
while(true) {
while (true) {
let blockAndRows = this._chandle.fetchBlock(this._result, this._fields);
// console.log(blockAndRows);
// break;
let block = blockAndRows.blocks;
let num_of_rows = blockAndRows.num_of_rows;
if (num_of_rows == 0) {
......@@ -205,16 +200,18 @@ TDengineCursor.prototype.fetchall = function fetchall(options, callback) {
this._rowcount += num_of_rows;
let numoffields = this._fields.length;
for (let i = 0; i < num_of_rows; i++) {
data.push([]);
// data.push([]);
let rowBlock = new Array(numoffields);
for (let j = 0; j < numoffields; j++) {
rowBlock[j] = block[j][i];
}
data[data.length-1] = (rowBlock);
data[this._rowcount - num_of_rows + i] = (rowBlock);
// data.push(rowBlock);
}
}
performance.mark('B');
performance.measure('query', 'A', 'B');
let response = this._createSetResponse(this._rowcount, time)
......@@ -239,7 +236,7 @@ TDengineCursor.prototype.fetchall = function fetchall(options, callback) {
* @return {number | Buffer} Number of affected rows or a Buffer that points to the results of the query
* @since 1.0.0
*/
TDengineCursor.prototype.execute_a = function execute_a (operation, options, callback, param) {
TDengineCursor.prototype.execute_a = function execute_a(operation, options, callback, param) {
if (operation == undefined) {
throw new errors.ProgrammingError('No operation passed as argument');
return null;
......@@ -265,14 +262,14 @@ TDengineCursor.prototype.execute_a = function execute_a (operation, options, cal
}
if (resCode >= 0) {
// let fieldCount = cr._chandle.numFields(res2);
// if (fieldCount == 0) {
// //cr._chandle.freeResult(res2);
// return res2;
// }
// else {
// return res2;
// }
// let fieldCount = cr._chandle.numFields(res2);
// if (fieldCount == 0) {
// //cr._chandle.freeResult(res2);
// return res2;
// }
// else {
// return res2;
// }
return res2;
}
......@@ -360,17 +357,17 @@ TDengineCursor.prototype.fetchall_a = function fetchall_a(result, options, callb
for (let k = 0; k < fields.length; k++) {
rowBlock[k] = block[k][j];
}
data[data.length-1] = rowBlock;
data[data.length - 1] = rowBlock;
}
}
cr._chandle.freeResult(result2); // free result, avoid seg faults and mem leaks!
callback(param2, result2, numOfRows2, {data:data,fields:fields});
callback(param2, result2, numOfRows2, { data: data, fields: fields });
}
}
ref.writeObject(buf, 0, param);
param = this._chandle.fetch_rows_a(result, asyncCallbackWrapper, buf); //returned param
return {param:param,result:result};
return { param: param, result: result };
}
/**
* Stop a query given the result handle.
......@@ -428,7 +425,7 @@ TDengineCursor.prototype.subscribe = function subscribe(config) {
*/
TDengineCursor.prototype.consumeData = async function consumeData(subscription, callback) {
while (true) {
let { data, fields, result} = this._chandle.consume(subscription);
let { data, fields, result } = this._chandle.consume(subscription);
callback(data, fields, result);
}
}
......@@ -450,7 +447,7 @@ TDengineCursor.prototype.unsubscribe = function unsubscribe(subscription) {
* @return {Buffer} A buffer pointing to the stream handle
* @since 1.3.0
*/
TDengineCursor.prototype.openStream = function openStream(sql, callback, stime = 0, stoppingCallback, param = {}) {
TDengineCursor.prototype.openStream = function openStream(sql, callback, stime = 0, stoppingCallback, param = {}) {
let buf = ref.alloc('Object');
ref.writeObject(buf, 0, param);
......@@ -463,17 +460,17 @@ TDengineCursor.prototype.unsubscribe = function unsubscribe(subscription) {
for (let k = 0; k < fields.length; k++) {
rowBlock[k] = blocks[k][j];
}
data[data.length-1] = rowBlock;
data[data.length - 1] = rowBlock;
}
callback(param2, result2, blocks, fields);
}
return this._chandle.openStream(this._connection._conn, sql, asyncCallbackWrapper, stime, stoppingCallback, buf);
}
/**
}
/**
* Close a stream
* @param {Buffer} - A buffer pointing to the handle of the stream to be closed
* @since 1.3.0
*/
TDengineCursor.prototype.closeStream = function closeStream(stream) {
TDengineCursor.prototype.closeStream = function closeStream(stream) {
this._chandle.closeStream(stream);
}
}
src/connector/nodejs/package-lock.json 已删除 100644 → 0
浏览文件 @ 4697cdfd
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src/connector/nodejs/package.json
浏览文件 @ f0b77fa3
{
"name": "td2.0-connector",
"version": "2.0.6",
"version": "2.0.7",
"description": "A Node.js connector for TDengine.",
"main": "tdengine.js",
"directories": {
......
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