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UPSTREAM: 115328: annotate early and late requests
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183 changes: 183 additions & 0 deletions
183
staging/src/k8s.io/apiserver/pkg/server/filters/with_early_late_annotations.go
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/* | ||
Copyright 2023 The Kubernetes Authors. | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
*/ | ||
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package filters | ||
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import ( | ||
"fmt" | ||
"net" | ||
"net/http" | ||
"strings" | ||
"time" | ||
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"k8s.io/apiserver/pkg/audit" | ||
"k8s.io/apiserver/pkg/authentication/user" | ||
"k8s.io/apiserver/pkg/endpoints/request" | ||
clockutils "k8s.io/utils/clock" | ||
netutils "k8s.io/utils/net" | ||
) | ||
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type lifecycleEvent interface { | ||
// Name returns the name of the signal, useful for logging. | ||
Name() string | ||
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// Signaled returns a channel that is closed when the underlying event | ||
// has been signaled. Successive calls to Signaled return the same value. | ||
Signaled() <-chan struct{} | ||
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// SignaledAt returns the time the event was signaled. If SignaledAt is | ||
// invoked before the event is signaled nil will be returned. | ||
SignaledAt() *time.Time | ||
} | ||
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type shouldExemptFunc func(*http.Request) bool | ||
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var ( | ||
// the health probes are not annotated by default | ||
healthProbes = []string{ | ||
"/readyz", | ||
"/healthz", | ||
"/livez", | ||
} | ||
) | ||
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func exemptIfHealthProbe(r *http.Request) bool { | ||
path := "/" + strings.TrimLeft(r.URL.Path, "/") | ||
for _, probe := range healthProbes { | ||
if path == probe { | ||
return true | ||
} | ||
} | ||
return false | ||
} | ||
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// WithShutdownLateAnnotation, if added to the handler chain, tracks the | ||
// incoming request(s) after the apiserver has initiated the graceful | ||
// shutdown, and annoates the audit event for these request(s) with | ||
// diagnostic information. | ||
// This enables us to identify the actor(s)/load balancer(s) that are sending | ||
// requests to the apiserver late during the server termination. | ||
// It should be placed after (in order of execution) the | ||
// 'WithAuthentication' filter. | ||
func WithShutdownLateAnnotation(handler http.Handler, shutdownInitiated lifecycleEvent, delayDuration time.Duration) http.Handler { | ||
return withShutdownLateAnnotation(handler, shutdownInitiated, delayDuration, exemptIfHealthProbe, clockutils.RealClock{}) | ||
} | ||
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// WithStartupEarlyAnnotation annotates the request with an annotation keyed as | ||
// 'apiserver.k8s.io/startup' if the request arrives early (the server is not | ||
// fully initialized yet). It should be placed after (in order of execution) | ||
// the 'WithAuthentication' filter. | ||
func WithStartupEarlyAnnotation(handler http.Handler, hasBeenReady lifecycleEvent) http.Handler { | ||
return withStartupEarlyAnnotation(handler, hasBeenReady, exemptIfHealthProbe) | ||
} | ||
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func withShutdownLateAnnotation(handler http.Handler, shutdownInitiated lifecycleEvent, delayDuration time.Duration, shouldExemptFn shouldExemptFunc, clock clockutils.PassiveClock) http.Handler { | ||
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) { | ||
select { | ||
case <-shutdownInitiated.Signaled(): | ||
default: | ||
handler.ServeHTTP(w, req) | ||
return | ||
} | ||
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if shouldExemptFn(req) { | ||
handler.ServeHTTP(w, req) | ||
return | ||
} | ||
shutdownInitiatedAt := shutdownInitiated.SignaledAt() | ||
if shutdownInitiatedAt == nil { | ||
handler.ServeHTTP(w, req) | ||
return | ||
} | ||
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elapsedSince := clock.Since(*shutdownInitiatedAt) | ||
// TODO: 80% is the threshold, if requests arrive after 80% of | ||
// shutdown-delay-duration elapses we annotate the request as late=true. | ||
late := lateMsg(delayDuration, elapsedSince, 80) | ||
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// NOTE: some upstream unit tests have authentication disabled and will | ||
// fail if we require the requestor to be present in the request | ||
// context. Fixing those unit tests will increase the chance of merge | ||
// conflict during rebase. | ||
// This also implies that this filter must be placed after (in order of | ||
// execution) the 'WithAuthentication' filter. | ||
self := "self=" | ||
if requestor, exists := request.UserFrom(req.Context()); exists && requestor != nil { | ||
self = fmt.Sprintf("%s%t", self, requestor.GetName() == user.APIServerUser) | ||
} | ||
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audit.AddAuditAnnotation(req.Context(), "apiserver.k8s.io/shutdown", | ||
fmt.Sprintf("%s %s loopback=%t", late, self, isLoopback(req.RemoteAddr))) | ||
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handler.ServeHTTP(w, req) | ||
}) | ||
} | ||
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func lateMsg(delayDuration, elapsedSince time.Duration, threshold float64) string { | ||
if delayDuration == time.Duration(0) { | ||
return fmt.Sprintf("elapsed=%s threshold= late=%t", elapsedSince.Round(time.Second).String(), true) | ||
} | ||
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percentElapsed := (float64(elapsedSince) / float64(delayDuration)) * 100 | ||
return fmt.Sprintf("elapsed=%s threshold=%.2f%% late=%t", | ||
elapsedSince.Round(time.Second).String(), percentElapsed, percentElapsed > threshold) | ||
} | ||
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func withStartupEarlyAnnotation(handler http.Handler, hasBeenReady lifecycleEvent, shouldExemptFn shouldExemptFunc) http.Handler { | ||
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) { | ||
select { | ||
case <-hasBeenReady.Signaled(): | ||
handler.ServeHTTP(w, req) | ||
return | ||
default: | ||
} | ||
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// NOTE: some upstream unit tests have authentication disabled and will | ||
// fail if we require the requestor to be present in the request | ||
// context. Fixing those unit tests will increase the chance of merge | ||
// conflict during rebase. | ||
// This also implies that this filter must be placed after (in order of | ||
// execution) the 'WithAuthentication' filter. | ||
self := "self=" | ||
if requestor, exists := request.UserFrom(req.Context()); exists && requestor != nil { | ||
if requestor.GetName() == user.APIServerUser { | ||
handler.ServeHTTP(w, req) | ||
return | ||
} | ||
self = fmt.Sprintf("%s%t", self, false) | ||
} | ||
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audit.AddAuditAnnotation(req.Context(), "apiserver.k8s.io/startup", | ||
fmt.Sprintf("early=true %s loopback=%t", self, isLoopback(req.RemoteAddr))) | ||
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handler.ServeHTTP(w, req) | ||
}) | ||
} | ||
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func isLoopback(address string) bool { | ||
host, _, err := net.SplitHostPort(address) | ||
if err != nil { | ||
// if the address is missing a port, SplitHostPort will return an error | ||
// with an empty host, and port value. For such an error, we should | ||
// continue and try to parse the original address. | ||
host = address | ||
} | ||
if ip := netutils.ParseIPSloppy(host); ip != nil { | ||
return ip.IsLoopback() | ||
} | ||
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return false | ||
} |
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