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54 lines
1.4 KiB
54 lines
1.4 KiB
package circuitbreaker
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import (
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"context"
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"github.com/go-kratos/aegis/circuitbreaker"
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"github.com/go-kratos/aegis/circuitbreaker/sre"
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"github.com/go-kratos/kratos/v2/errors"
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"github.com/go-kratos/kratos/v2/middleware"
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)
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// Option is circuit breaker option.
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type Option func(*options)
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// WithBreaker set circuit breaker implentation
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func WithBreaker(breaker circuitbreaker.CircuitBreaker) Option {
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return func(o *options) {
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o.breaker = breaker
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}
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}
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type options struct {
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breaker circuitbreaker.CircuitBreaker
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}
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// Client circuitbreaker middleware will return errBreakerTriggered when the circuit
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// breaker is triggered and the request is rejected directly.
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func Client(opts ...Option) middleware.Middleware {
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options := &options{
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breaker: sre.NewBreaker(),
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}
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for _, o := range opts {
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o(options)
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}
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return func(handler middleware.Handler) middleware.Handler {
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return func(ctx context.Context, req interface{}) (interface{}, error) {
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if err := options.breaker.Allow(); err != nil {
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// rejected
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// NOTE: when client reject requets locally,
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// continue add counter let the drop ratio higher.
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options.breaker.MarkFailed()
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return nil, errors.New(503, "CIRCUITBREAKER", "request failed due to circuit breaker triggered")
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}
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// allowed
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reply, err := handler(ctx, req)
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if err != nil {
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options.breaker.MarkFailed()
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} else {
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options.breaker.MarkSuccess()
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}
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return reply, err
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}
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}
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}
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