traefik/pkg/middlewares/circuitbreaker/circuit_breaker.go

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package circuitbreaker
import (
"context"
"net/http"
"time"
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"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
"github.com/traefik/traefik/v3/pkg/logs"
"github.com/traefik/traefik/v3/pkg/middlewares"
"github.com/traefik/traefik/v3/pkg/tracing"
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"github.com/vulcand/oxy/v2/cbreaker"
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"go.opentelemetry.io/otel/trace"
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)
const typeName = "CircuitBreaker"
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type circuitBreaker struct {
circuitBreaker *cbreaker.CircuitBreaker
name string
}
// New creates a new circuit breaker middleware.
func New(ctx context.Context, next http.Handler, confCircuitBreaker dynamic.CircuitBreaker, name string) (http.Handler, error) {
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expression := confCircuitBreaker.Expression
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logger := middlewares.GetLogger(ctx, name, typeName)
logger.Debug().Msg("Creating middleware")
logger.Debug().Msgf("Setting up with expression: %s", expression)
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responseCode := confCircuitBreaker.ResponseCode
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cbOpts := []cbreaker.Option{
cbreaker.Fallback(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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tracing.SetStatusErrorf(req.Context(), "blocked by circuit-breaker (%q)", expression)
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rw.WriteHeader(responseCode)
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if _, err := rw.Write([]byte(http.StatusText(responseCode))); err != nil {
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log.Ctx(req.Context()).Error().Err(err).Send()
}
})),
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cbreaker.Logger(logs.NewOxyWrapper(*logger)),
cbreaker.Verbose(logger.GetLevel() == zerolog.TraceLevel),
}
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if confCircuitBreaker.CheckPeriod > 0 {
cbOpts = append(cbOpts, cbreaker.CheckPeriod(time.Duration(confCircuitBreaker.CheckPeriod)))
}
if confCircuitBreaker.FallbackDuration > 0 {
cbOpts = append(cbOpts, cbreaker.FallbackDuration(time.Duration(confCircuitBreaker.FallbackDuration)))
}
if confCircuitBreaker.RecoveryDuration > 0 {
cbOpts = append(cbOpts, cbreaker.RecoveryDuration(time.Duration(confCircuitBreaker.RecoveryDuration)))
}
oxyCircuitBreaker, err := cbreaker.New(next, expression, cbOpts...)
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if err != nil {
return nil, err
}
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return &circuitBreaker{
circuitBreaker: oxyCircuitBreaker,
name: name,
}, nil
}
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func (c *circuitBreaker) GetTracingInformation() (string, string, trace.SpanKind) {
return c.name, typeName, trace.SpanKindInternal
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}
func (c *circuitBreaker) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
c.circuitBreaker.ServeHTTP(rw, req)
}