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Extract scaling from zero

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- extracting this package means it can be used in other components
such as the asynchronous nats-queue-worker which may need to
invoke functions which are scaled down to zero replicas.

Ref: https://github.com/openfaas/nats-queue-worker/issues/32

Tested on Docker Swarm for scaling up, already scaled and not
found error.

Signed-off-by: Alex Ellis (VMware) <alexellis2@gmail.com>
This commit is contained in:
Alex Ellis (VMware)
2018-11-01 12:54:17 +00:00
committed by Alex Ellis
parent fb06e299cf
commit 9cea08c728
15 changed files with 208 additions and 125 deletions
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27
gateway/handlers/alerthandler.go
View File

@ -11,30 +11,11 @@ import (
"net/http"
"github.com/openfaas/faas/gateway/requests"
)
const (
// DefaultMinReplicas is the minimal amount of replicas for a service.
DefaultMinReplicas = 1
// DefaultMaxReplicas is the amount of replicas a service will auto-scale up to.
DefaultMaxReplicas = 20
// DefaultScalingFactor is the defining proportion for the scaling increments.
DefaultScalingFactor = 20
// MinScaleLabel label indicating min scale for a function
MinScaleLabel = "com.openfaas.scale.min"
// MaxScaleLabel label indicating max scale for a function
MaxScaleLabel = "com.openfaas.scale.max"
// ScalingFactorLabel label indicates the scaling factor for a function
ScalingFactorLabel = "com.openfaas.scale.factor"
"github.com/openfaas/faas/gateway/scaling"
)
// MakeAlertHandler handles alerts from Prometheus Alertmanager
func MakeAlertHandler(service ServiceQuery) http.HandlerFunc {
func MakeAlertHandler(service scaling.ServiceQuery) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
log.Println("Alert received.")
@ -76,7 +57,7 @@ func MakeAlertHandler(service ServiceQuery) http.HandlerFunc {
}
}
func handleAlerts(req *requests.PrometheusAlert, service ServiceQuery) []error {
func handleAlerts(req *requests.PrometheusAlert, service scaling.ServiceQuery) []error {
var errors []error
for _, alert := range req.Alerts {
if err := scaleService(alert, service); err != nil {
@ -88,7 +69,7 @@ func handleAlerts(req *requests.PrometheusAlert, service ServiceQuery) []error {
return errors
}
func scaleService(alert requests.PrometheusInnerAlert, service ServiceQuery) error {
func scaleService(alert requests.PrometheusInnerAlert, service scaling.ServiceQuery) error {
var err error
serviceName := alert.Labels.FunctionName