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Feature for probing functions

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Introduces a single-flight call to a function's health
endpoint to verify that it is registered with an Istio
sidecar (Envoy) before letting the invocation through.

Results are cached for 5 seconds, before a probe is
required again.

Tested without Istio, with probe_functions environment
variable set to true, I saw a probe execute in the logs.

Fixes: #1721 for Istio users.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alex@openfaas.com>
This commit is contained in:
Alex Ellis (OpenFaaS Ltd)
2022-06-29 10:09:01 +01:00
committed by Alex Ellis
parent 01841f605c
commit 88eea5f62e
43 changed files with 784 additions and 468 deletions
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3
gateway/handlers/queue_proxy.go
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@ -14,6 +14,7 @@ import (
"github.com/gorilla/mux"
ftypes "github.com/openfaas/faas-provider/types"
"github.com/openfaas/faas/gateway/metrics"
"github.com/openfaas/faas/gateway/pkg/middleware"
"github.com/openfaas/faas/gateway/scaling"
)
@ -21,7 +22,7 @@ import (
const queueAnnotation = "com.openfaas.queue"
// MakeQueuedProxy accepts work onto a queue
func MakeQueuedProxy(metrics metrics.MetricOptions, queuer ftypes.RequestQueuer, pathTransformer URLPathTransformer, defaultNS string, functionQuery scaling.FunctionQuery) http.HandlerFunc {
func MakeQueuedProxy(metrics metrics.MetricOptions, queuer ftypes.RequestQueuer, pathTransformer middleware.URLPathTransformer, defaultNS string, functionQuery scaling.FunctionQuery) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if r.Body != nil {
defer r.Body.Close()