traefik/middlewares/cbreaker.go

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