/*
 *      Copyright (c) 2018-2028, DreamLu All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  Redistributions of source code must retain the above copyright notice,
 *  this list of conditions and the following disclaimer.
 *  Redistributions in binary form must reproduce the above copyright
 *  notice, this list of conditions and the following disclaimer in the
 *  documentation and/or other materials provided with the distribution.
 *  Neither the name of the dreamlu.net developer nor the names of its
 *  contributors may be used to endorse or promote products derived from
 *  this software without specific prior written permission.
 *  Author: DreamLu 卢春梦 (596392912@qq.com)
 */
package org.springblade.core.metrics.sentinel;

import com.alibaba.csp.sentinel.metric.extension.MetricExtension;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import io.micrometer.core.instrument.Metrics;
import io.micrometer.core.instrument.Tags;
import org.springblade.core.auto.service.AutoService;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Sentinel Metrics Extension
 *
 * @author L.cm
 */
@AutoService(MetricExtension.class)
public class SentinelMetricsExtension implements MetricExtension {
	public static final String PASS_REQUESTS_TOTAL = "sentinel_pass_requests_total";
	public static final String BLOCK_REQUESTS_TOTAL = "sentinel_block_requests_total";
	public static final String SUCCESS_REQUESTS_TOTAL = "sentinel_success_requests_total";
	public static final String EXCEPTION_REQUESTS_TOTAL = "sentinel_exception_requests_total";
	public static final String REQUESTS_LATENCY_SECONDS = "sentinel_requests_latency_seconds";
	public static final String CURRENT_THREADS = "sentinel_current_threads";
	public static final String DEFAULT_TAT_NAME = "resource";
	private final AtomicLong CURRENT_THREAD_COUNT = new AtomicLong(0);

	@Override
	public void addPass(String resource, int n, Object... args) {
		Metrics.counter(PASS_REQUESTS_TOTAL, DEFAULT_TAT_NAME, resource).increment(n);
	}

	@Override
	public void addBlock(String resource, int n, String origin, BlockException ex, Object... args) {
		Metrics.counter(BLOCK_REQUESTS_TOTAL, resource, ex.getClass().getSimpleName(), ex.getRuleLimitApp(), origin).increment(n);
	}

	@Override
	public void addSuccess(String resource, int n, Object... args) {
		Metrics.counter(SUCCESS_REQUESTS_TOTAL, DEFAULT_TAT_NAME, resource).increment(n);
	}

	@Override
	public void addException(String resource, int n, Throwable throwable) {
		Metrics.counter(EXCEPTION_REQUESTS_TOTAL, DEFAULT_TAT_NAME, resource).increment(n);
	}

	@Override
	public void addRt(String resource, long rt, Object... args) {
		Metrics.timer(REQUESTS_LATENCY_SECONDS, DEFAULT_TAT_NAME, resource).record(rt, TimeUnit.MICROSECONDS);
	}

	@Override
	public void increaseThreadNum(String resource, Object... args) {
		Tags tags = Tags.of(DEFAULT_TAT_NAME, resource);
		Metrics.gauge(CURRENT_THREADS, tags, CURRENT_THREAD_COUNT, AtomicLong::incrementAndGet);
	}

	@Override
	public void decreaseThreadNum(String resource, Object... args) {
		Tags tags = Tags.of(DEFAULT_TAT_NAME, resource);
		Metrics.gauge(CURRENT_THREADS, tags, CURRENT_THREAD_COUNT, AtomicLong::decrementAndGet);
	}
}