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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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11
gateway/handlers/scaling.go
View File

@ -7,18 +7,11 @@ import (
"fmt"
"log"
"net/http"
"strings"
"github.com/openfaas/faas/gateway/pkg/middleware"
"github.com/openfaas/faas/gateway/scaling"
)
func getNamespace(defaultNamespace, fullName string) (string, string) {
if index := strings.LastIndex(fullName, "."); index > -1 {
return fullName[:index], fullName[index+1:]
}
return fullName, defaultNamespace
}
// MakeScalingHandler creates handler which can scale a function from
// zero to N replica(s). After scaling the next http.HandlerFunc will
// be called. If the function is not ready after the configured
@ -28,7 +21,7 @@ func MakeScalingHandler(next http.HandlerFunc, scaler scaling.FunctionScaler, co
return func(w http.ResponseWriter, r *http.Request) {
functionName, namespace := getNamespace(defaultNamespace, getServiceName(r.URL.String()))
functionName, namespace := middleware.GetNamespace(defaultNamespace, middleware.GetServiceName(r.URL.String()))
res := scaler.Scale(functionName, namespace)