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instrument.go
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instrument.go
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package main
import (
"context"
"errors"
"github.com/go-kit/kit/endpoint"
"github.com/go-kit/kit/metrics"
"github.com/juju/ratelimit"
"golang.org/x/time/rate"
"time"
)
var ErrLimitExceed = errors.New("Rate limit exceed!")
// NewTokenBucketLimitterWithJuju 使用juju/ratelimit创建限流中间件
func NewTokenBucketLimitterWithJuju(bkt *ratelimit.Bucket) endpoint.Middleware {
return func(next endpoint.Endpoint) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (response interface{}, err error) {
if bkt.TakeAvailable(1) == 0 {
return nil, ErrLimitExceed
}
return next(ctx, request)
}
}
}
// NewTokenBucketLimitterWithBuildIn 使用x/time/rate创建限流中间件
func NewTokenBucketLimitterWithBuildIn(bkt *rate.Limiter) endpoint.Middleware {
return func(next endpoint.Endpoint) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (response interface{}, err error) {
if !bkt.Allow() {
return nil, ErrLimitExceed
}
return next(ctx, request)
}
}
}
// metricMiddleware 定义监控中间件,嵌入Service
// 新增监控指标项:requestCount和requestLatency
type metricMiddleware struct {
Service
requestCount metrics.Counter
requestLatency metrics.Histogram
}
// Metrics 封装监控方法
func Metrics(requestCount metrics.Counter, requestLatency metrics.Histogram) ServiceMiddleware {
return func(next Service) Service {
return metricMiddleware{
next,
requestCount,
requestLatency}
}
}
func (mw metricMiddleware) Add(a, b int) (ret int) {
defer func(beign time.Time) {
lvs := []string{"method", "Add"}
mw.requestCount.With(lvs...).Add(1)
mw.requestLatency.With(lvs...).Observe(time.Since(beign).Seconds())
}(time.Now())
ret = mw.Service.Add(a, b)
return ret
}
func (mw metricMiddleware) Subtract(a, b int) (ret int) {
defer func(beign time.Time) {
lvs := []string{"method", "Subtract"}
mw.requestCount.With(lvs...).Add(1)
mw.requestLatency.With(lvs...).Observe(time.Since(beign).Seconds())
}(time.Now())
ret = mw.Service.Subtract(a, b)
return ret
}
func (mw metricMiddleware) Multiply(a, b int) (ret int) {
defer func(beign time.Time) {
lvs := []string{"method", "Multiply"}
mw.requestCount.With(lvs...).Add(1)
mw.requestLatency.With(lvs...).Observe(time.Since(beign).Seconds())
}(time.Now())
ret = mw.Service.Multiply(a, b)
return ret
}
func (mw metricMiddleware) Divide(a, b int) (ret int, err error) {
defer func(beign time.Time) {
lvs := []string{"method", "Divide"}
mw.requestCount.With(lvs...).Add(1)
mw.requestLatency.With(lvs...).Observe(time.Since(beign).Seconds())
}(time.Now())
ret, err = mw.Service.Divide(a, b)
return
}
func (mw metricMiddleware) HealthCheck() (result bool) {
defer func(begin time.Time) {
lvs := []string{"method", "HealthCheck"}
mw.requestCount.With(lvs...).Add(1)
mw.requestLatency.With(lvs...).Observe(time.Since(begin).Seconds())
}(time.Now())
result = mw.Service.HealthCheck()
return
}