37 lines
1.1 KiB
Go
37 lines
1.1 KiB
Go
package middlewares
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import (
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"net/http"
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"github.com/containous/traefik/middlewares/tracing"
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"github.com/vulcand/oxy/cbreaker"
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)
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// CircuitBreaker holds the oxy circuit breaker.
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type CircuitBreaker struct {
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circuitBreaker *cbreaker.CircuitBreaker
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}
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// NewCircuitBreaker returns a new CircuitBreaker.
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func NewCircuitBreaker(next http.Handler, expression string, options ...cbreaker.CircuitBreakerOption) (*CircuitBreaker, error) {
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circuitBreaker, err := cbreaker.New(next, expression, options...)
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if err != nil {
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return nil, err
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}
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return &CircuitBreaker{circuitBreaker}, nil
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}
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// NewCircuitBreakerOptions returns a new CircuitBreakerOption
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func NewCircuitBreakerOptions(expression string) cbreaker.CircuitBreakerOption {
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return cbreaker.Fallback(
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http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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tracing.LogEventf(r, "blocked by circuitbreaker (%q)", expression)
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w.WriteHeader(http.StatusServiceUnavailable)
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w.Write([]byte(http.StatusText(http.StatusServiceUnavailable)))
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}))
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}
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func (cb *CircuitBreaker) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
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cb.circuitBreaker.ServeHTTP(rw, r)
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}
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