traefik/pkg/middlewares/buffering/buffering.go

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package buffering
import (
"context"
"net/http"
"github.com/opentracing/opentracing-go/ext"
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"github.com/rs/zerolog"
"github.com/traefik/traefik/v2/pkg/config/dynamic"
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"github.com/traefik/traefik/v2/pkg/logs"
"github.com/traefik/traefik/v2/pkg/middlewares"
"github.com/traefik/traefik/v2/pkg/tracing"
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oxybuffer "github.com/vulcand/oxy/v2/buffer"
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)
const (
typeName = "Buffer"
)
type buffer struct {
name string
buffer *oxybuffer.Buffer
}
// New creates a buffering middleware.
func New(ctx context.Context, next http.Handler, config dynamic.Buffering, name string) (http.Handler, error) {
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logger := middlewares.GetLogger(ctx, name, typeName)
logger.Debug().Msg("Creating middleware")
logger.Debug().Msgf("Setting up buffering: request limits: %d (mem), %d (max), response limits: %d (mem), %d (max) with retry: '%s'",
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config.MemRequestBodyBytes, config.MaxRequestBodyBytes, config.MemResponseBodyBytes, config.MaxResponseBodyBytes, config.RetryExpression)
oxyBuffer, err := oxybuffer.New(
next,
oxybuffer.MemRequestBodyBytes(config.MemRequestBodyBytes),
oxybuffer.MaxRequestBodyBytes(config.MaxRequestBodyBytes),
oxybuffer.MemResponseBodyBytes(config.MemResponseBodyBytes),
oxybuffer.MaxResponseBodyBytes(config.MaxResponseBodyBytes),
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oxybuffer.Logger(logs.NewOxyWrapper(*logger)),
oxybuffer.Verbose(logger.GetLevel() == zerolog.TraceLevel),
oxybuffer.Cond(len(config.RetryExpression) > 0, oxybuffer.Retry(config.RetryExpression)),
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)
if err != nil {
return nil, err
}
return &buffer{
name: name,
buffer: oxyBuffer,
}, nil
}
func (b *buffer) GetTracingInformation() (string, ext.SpanKindEnum) {
return b.name, tracing.SpanKindNoneEnum
}
func (b *buffer) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
b.buffer.ServeHTTP(rw, req)
}