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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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18
gateway/handlers/alerthandler_test.go
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@ -5,12 +5,14 @@ package handlers
import (
"testing"
"github.com/openfaas/faas/gateway/scaling"
)
func TestDisabledScale(t *testing.T) {
minReplicas := uint64(1)
scalingFactor := uint64(0)
newReplicas := CalculateReplicas("firing", DefaultMinReplicas, DefaultMaxReplicas, minReplicas, scalingFactor)
newReplicas := CalculateReplicas("firing", scaling.DefaultMinReplicas, scaling.DefaultMaxReplicas, minReplicas, scalingFactor)
if newReplicas != minReplicas {
t.Logf("Expected not to scale, but replicas were: %d", newReplicas)
t.Fail()
@ -20,7 +22,7 @@ func TestDisabledScale(t *testing.T) {
func TestParameterEdge(t *testing.T) {
minReplicas := uint64(0)
scalingFactor := uint64(0)
newReplicas := CalculateReplicas("firing", DefaultMinReplicas, DefaultMaxReplicas, minReplicas, scalingFactor)
newReplicas := CalculateReplicas("firing", scaling.DefaultMinReplicas, scaling.DefaultMaxReplicas, minReplicas, scalingFactor)
if newReplicas != 0 {
t.Log("Expected not to scale")
t.Fail()
@ -41,7 +43,7 @@ func TestScalingWithSameUpperLowerLimit(t *testing.T) {
func TestMaxScale(t *testing.T) {
minReplicas := uint64(1)
scalingFactor := uint64(100)
newReplicas := CalculateReplicas("firing", DefaultMinReplicas, DefaultMaxReplicas, minReplicas, scalingFactor)
newReplicas := CalculateReplicas("firing", scaling.DefaultMinReplicas, scaling.DefaultMaxReplicas, minReplicas, scalingFactor)
if newReplicas != 20 {
t.Log("Expected ceiling of 20 replicas")
t.Fail()
@ -51,7 +53,7 @@ func TestMaxScale(t *testing.T) {
func TestInitialScale(t *testing.T) {
minReplicas := uint64(1)
scalingFactor := uint64(20)
newReplicas := CalculateReplicas("firing", DefaultMinReplicas, DefaultMaxReplicas, minReplicas, scalingFactor)
newReplicas := CalculateReplicas("firing", scaling.DefaultMinReplicas, scaling.DefaultMaxReplicas, minReplicas, scalingFactor)
if newReplicas != 4 {
t.Log("Expected the increment to equal 4")
t.Fail()
@ -61,7 +63,7 @@ func TestInitialScale(t *testing.T) {
func TestScale(t *testing.T) {
minReplicas := uint64(1)
scalingFactor := uint64(20)
newReplicas := CalculateReplicas("firing", 4, DefaultMaxReplicas, minReplicas, scalingFactor)
newReplicas := CalculateReplicas("firing", 4, scaling.DefaultMaxReplicas, minReplicas, scalingFactor)
if newReplicas != 8 {
t.Log("Expected newReplicas to equal 8")
t.Fail()
@ -71,7 +73,7 @@ func TestScale(t *testing.T) {
func TestScaleCeiling(t *testing.T) {
minReplicas := uint64(1)
scalingFactor := uint64(20)
newReplicas := CalculateReplicas("firing", 20, DefaultMaxReplicas, minReplicas, scalingFactor)
newReplicas := CalculateReplicas("firing", 20, scaling.DefaultMaxReplicas, minReplicas, scalingFactor)
if newReplicas != 20 {
t.Log("Expected ceiling of 20 replicas")
t.Fail()
@ -81,7 +83,7 @@ func TestScaleCeiling(t *testing.T) {
func TestScaleCeilingEdge(t *testing.T) {
minReplicas := uint64(1)
scalingFactor := uint64(20)
newReplicas := CalculateReplicas("firing", 19, DefaultMaxReplicas, minReplicas, scalingFactor)
newReplicas := CalculateReplicas("firing", 19, scaling.DefaultMaxReplicas, minReplicas, scalingFactor)
if newReplicas != 20 {
t.Log("Expected ceiling of 20 replicas")
t.Fail()
@ -91,7 +93,7 @@ func TestScaleCeilingEdge(t *testing.T) {
func TestBackingOff(t *testing.T) {
minReplicas := uint64(1)
scalingFactor := uint64(20)
newReplicas := CalculateReplicas("resolved", 8, DefaultMaxReplicas, minReplicas, scalingFactor)
newReplicas := CalculateReplicas("resolved", 8, scaling.DefaultMaxReplicas, minReplicas, scalingFactor)
if newReplicas != 1 {
t.Log("Expected backing off to 1 replica")
t.Fail()