feat(middleware/breaker): add circuit breaker middleware (#1299)
* add breaker middlewarepull/1420/head
Kagaya
3 years ago
committed by
GitHub
parent
221fa98319
commit
47f039792b
@ -0,0 +1,53 @@ |
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package circuitbreaker |
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import ( |
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"context" |
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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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"github.com/go-kratos/sra/circuitbreaker" |
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"github.com/go-kratos/sra/circuitbreaker/sre" |
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) |
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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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