Jacob
99 lines
2.6 KiB
JavaScript
99 lines
2.6 KiB
JavaScript
const profilerDefaultConfig = {
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trace: false,
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slowQueryWarningTime: 100,
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slowestQueries: 21,
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timeInterval: 300000,
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};
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function updateExecutionTimes(object, queryTime) {
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let returnObj = null;
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if (object) {
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const { totalExecutionTime, queryCount } = object;
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returnObj = {
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totalExecutionTime: totalExecutionTime + queryTime,
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queryCount: queryCount + 1,
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};
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} else {
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returnObj = {
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totalExecutionTime: queryTime,
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queryCount: 1,
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};
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}
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return returnObj;
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}
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class Profiler {
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constructor(logger, config) {
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this.version = 'MySQL';
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this.startTime = Date.now();
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this.logger = logger;
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this.config = Object.assign({}, profilerDefaultConfig, config);
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this.profiles = {
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executionTimes: [],
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resources: {},
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slowQueries: [],
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};
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this.slowQueryLimit = 0;
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}
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get getFastestSlowQuery() {
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return this.profiles.slowQueries.reduce((acc, cur) => ((cur < acc) ? cur : acc));
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}
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addSlowQuery(sql, resource, queryTime) {
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this.profiles.slowQueries.push({ sql, resource, queryTime });
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if (this.profiles.slowQueries.length > this.config.slowestQueries) {
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const min = this.getFastestSlowQuery;
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this.profiles.slowQueries = this.profiles.slowQueries.filter(el => el !== min);
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this.slowQueryLimit = this.getFastestSlowQuery;
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}
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}
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setVersion(version) {
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this.version = version;
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}
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fillExecutionTimes(interval) {
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for (let i = 0; i < interval; i += 1) {
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if (!this.profiles.executionTimes[i]) {
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this.profiles.executionTimes[i] = {
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totalExecutionTime: 0,
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queryCount: 0,
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};
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}
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}
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}
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profile(time, sql, resource) {
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const interval = Math.floor((Date.now() - this.startTime) / this.config.timeInterval);
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const queryTime = time[0] * 1e3 + time[1] * 1e-6;
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this.profiles.resources[resource] = updateExecutionTimes(
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this.profiles.resources[resource], queryTime,
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);
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this.profiles.executionTimes[interval] = updateExecutionTimes(
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this.profiles.executionTimes[interval], queryTime,
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);
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// fix execution times manually
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this.fillExecutionTimes(interval);
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// todo: cull old intervals
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if (this.slowQueryLimit < queryTime) {
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this.addSlowQuery(sql, resource, queryTime);
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}
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if (this.slowQueryWarningTime < queryTime) {
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this.logger.error(`[${this.version}] [Slow Query Warning] [${resource}] [${queryTime.toFixed()}ms] ${sql}`);
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}
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if (this.config.trace) {
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this.logger.log(`[${this.version}] [${resource}] [${queryTime.toFixed()}ms] ${sql}`);
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}
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}
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}
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module.exports = Profiler;
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