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absorb.go
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absorb.go
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package diag
import (
"io"
"net/http"
"github.com/zalando/skipper/filters"
"github.com/zalando/skipper/filters/flowid"
"github.com/zalando/skipper/logging"
)
// AbsorbName contains the name of the absorb filter.
const AbsorbName = "absorb"
type absorb struct {
logger logging.Logger
id flowid.Generator
}
func withLogger(l logging.Logger) filters.Spec {
if l == nil {
l = &logging.DefaultLog{}
}
id, err := flowid.NewStandardGenerator(flowid.MinLength)
if err != nil {
l.Errorf("failed to create ID generator: %v", err)
}
return &absorb{
logger: l,
id: id,
}
}
// NewAbsorb initializes a filter spec for the absorb filter.
//
// The absorb filter reads and discards the payload of the incoming requests.
// It logs with INFO level and a unique ID per request:
// - the event of receiving the request
// - partial and final events for consuming request payload and total consumed byte count
// - the finishing event of the request
// - any read errors other than EOF
func NewAbsorb() filters.Spec {
return withLogger(nil)
}
func (a absorb) Name() string { return AbsorbName }
func (a absorb) CreateFilter(args []interface{}) (filters.Filter, error) { return a, nil }
func (a absorb) Response(filters.FilterContext) {}
func (a absorb) Request(ctx filters.FilterContext) {
req := ctx.Request()
id := req.Header.Get(flowid.HeaderName)
if id == "" {
if a.id == nil {
id = "-"
} else {
var err error
if id, err = a.id.Generate(); err != nil {
a.logger.Error(err)
}
}
}
a.logger.Infof("received request to be absorbed: %s", id)
var count = 0
buf := make([]byte, 1<<12)
for {
n, err := req.Body.Read(buf)
count += n
a.logger.Infof("request %s, consumed bytes: %d", id, count)
if err != nil {
if err != io.EOF {
a.logger.Infof("request %s, error while consuming request: %v", id, err)
}
break
}
}
a.logger.Infof("request %s, consumed bytes: %d", id, count)
a.logger.Infof("request finished: %s", id)
ctx.Serve(&http.Response{StatusCode: http.StatusOK})
}