chore: Add pubsub scaler e2e test

Fixes kedacore#1528

Signed-off-by: Ram Cohen <ram.cohen@gmail.com>

tests/scalers/gcp-pubsub.test.ts

@@ -0,0 +1,235 @@
+import * as crypto from 'crypto'
+import * as fs from 'fs'
+import * as sh from 'shelljs'
+import * as tmp from 'tmp'
+import test from 'ava'
+
+const testNamespace = 'gcp-pubsub-test'
+const projectId = 'nth-hybrid-341214'
+const topicId = `projects/${projectId}/topics/keda-test-topic-` + crypto.randomBytes(6).toString('hex')
+const subscriptionName = `keda-test-topic-sub-` + crypto.randomBytes(6).toString('hex')
+const subscriptionId = `projects/${projectId}/subscriptions/${subscriptionName}`
+const deploymentName = 'dummy-consumer'
+const maxReplicaCount = '4'
+const gsPrefix = `kubectl exec --namespace ${testNamespace} deploy/gcp-sdk -- `
+
+test.before(t => {
+    sh.exec(`kubectl create namespace ${testNamespace}`)
+
+    // deploy dummy consumer app, scaled object etc.
+    const tmpFile = tmp.fileSync()
+    fs.writeFileSync(tmpFile.name, deployYaml.replace("{{GCP_CREDS}}", Buffer.from(serviceAccountJson).toString("base64")))
+
+    t.is(
+        0,
+        sh.exec(`kubectl apply -f ${tmpFile.name} --namespace ${testNamespace}`).code,
+        'creating a deployment should work..'
+    )
+
+})
+
+test.serial('Deployment should have 0 replicas on start', t => {
+    const replicaCount = sh.exec(
+        `kubectl get deployment.apps/${deploymentName} --namespace ${testNamespace} -o jsonpath="{.spec.replicas}"`
+    ).stdout
+    t.is(replicaCount, '0', 'replica count should start out as 0')
+})
+
+test.serial('creating the gcp-sdk pod should work..', t => {
+    let tmpFile = tmp.fileSync()
+    fs.writeFileSync(tmpFile.name, gcpSdkYaml)
+    t.is(
+        0,
+        sh.exec(`kubectl apply -f ${tmpFile.name} --namespace ${testNamespace}`).code,
+        'creating the gcp-sdk pod should work..'
+    )
+
+    // wait for the gcp-sdkpod to be ready
+    let gcpSdkReadyReplicaCount = '0'
+    for (let i = 0; i < 30; i++) {
+        gcpSdkReadyReplicaCount = sh.exec(`kubectl get deploy/gcp-sdk -n ${testNamespace} -o jsonpath='{.status.readyReplicas}'`).stdout
+        if (gcpSdkReadyReplicaCount != '1') {
+            sh.exec('sleep 2s')
+        }
+    }
+    t.is('1', gcpSdkReadyReplicaCount, 'GCP-SDK pod is not in a ready state')
+})
+
+test.serial('initializing the gcp-sdk pod should work..', t => {
+    // Authenticate to GCP
+    t.is(
+        0,
+        sh.exec(gsPrefix + `gcloud auth activate-service-account --key-file /etc/secret-volume/creds.json`).code,
+        'Executing remote command on gcp-sdk should work..'
+    )
+
+    // Set project id
+    sh.exec(gsPrefix + `gcloud config set project ${projectId}`)
+
+    // Create topic and subscription
+    t.is(
+        0,
+        sh.exec(gsPrefix + `gcloud pubsub topics create ${topicId}`).code,
+        'Creating a topic should work..'
+    )
+
+    t.is(0,
+        sh.exec(gsPrefix + `gcloud pubsub subscriptions create ${subscriptionId} --topic=${topicId}`).code,
+        'Creating a subscription should work..'
+    )
+})
+
+test.serial(`Publishing to pubsub`, t => {
+    let replicaCount = '0'
+
+    // Publish 30 messages
+    for (let i = 0; i < 30; i++) {
+        t.is(
+            0,
+            sh.exec(gsPrefix + `gcloud pubsub topics publish ${topicId} --message="AAAAAAAAAA"`).code,
+            'Publishing a message to pub/sub should work..'
+        )
+    }
+})
+
+test.serial(`Deployment should scale to ${maxReplicaCount} (the max) then back to 0`, t => {
+    let replicaCount = '0'
+
+    // Wait for the number of replicas to be scaled up to maxReplicaCount
+    for (let i = 0; i < 150 && replicaCount != maxReplicaCount; i++) {
+        replicaCount = sh.exec(
+            `kubectl get deployment.apps/${deploymentName} --namespace ${testNamespace} -o jsonpath="{.spec.replicas}"`
+        ).stdout
+        if (replicaCount != maxReplicaCount) {
+            sh.exec('sleep 2s')
+        }
+    }
+
+    t.is(maxReplicaCount, replicaCount, `Replica count should be ${maxReplicaCount} after 120 seconds but is ${replicaCount}`)
+
+    // Purge all messages
+    sh.exec(gsPrefix + `gcloud pubsub subscriptions seek ${subscriptionId} --time=-p1s`)
+
+    // Wait for the number of replicas to be scaled down to 0
+    for (let i = 0; i < 30 && replicaCount !== '0'; i++) {
+      replicaCount = sh.exec(
+        `kubectl get deployment.apps/${deploymentName} --namespace ${testNamespace} -o jsonpath="{.spec.replicas}"`
+      ).stdout
+      if (replicaCount != '0') {
+        sh.exec('sleep 10s')
+      }
+    }
+
+    t.is('0', replicaCount, 'Replica count should be 0 after 3 minutes')
+})
+
+test.after.always.cb('clean up', t => {
+    // Delete the subscription and topic
+    sh.exec(gsPrefix + `gcloud pubsub subscriptions delete ${subscriptionId}`)
+    sh.exec(gsPrefix + `gcloud pubsub topics delete ${topicId}`)
+
+    sh.exec(`kubectl delete deployment.apps/${deploymentName} --namespace ${testNamespace}`)
+    sh.exec(`kubectl delete namespace ${testNamespace}`)
+
+  t.end()
+})
+
+
+const deployYaml = `apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: ${deploymentName}
+  namespace: ${testNamespace}
+  labels:
+    app: ${deploymentName}
+spec:
+  replicas: 0
+  selector:
+    matchLabels:
+      app: ${deploymentName}
+  template:
+    metadata:
+      labels:
+        app: ${deploymentName}
+    spec:
+      containers:
+        - name: ${deploymentName}-processor
+          image: google/cloud-sdk:slim
+          # Consume a message
+          command: [ "/bin/bash", "-c", "--" ]
+          args: [ "gcloud auth activate-service-account --key-file /etc/secret-volume/creds.json && gcloud pubsub subscriptions pull ${subscriptionId} --auto-ack" ]
+          env:
+            - name: GOOGLE_APPLICATION_CREDENTIALS_JSON
+              valueFrom:
+                secretKeyRef:
+                  name: pubsub-secrets
+                  key: creds.json
+          volumeMounts:
+            - name: secret-volume
+              mountPath: /etc/secret-volume
+      volumes:
+        - name: secret-volume
+          secret:
+            secretName: pubsub-secrets
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: pubsub-secrets
+type: Opaque
+data:
+  creds.json: {{GCP_CREDS}}
+---
+apiVersion: keda.sh/v1alpha1
+kind: ScaledObject
+metadata:
+  name: test-scaledobject
+spec:
+  scaleTargetRef:
+    name: ${deploymentName}
+  pollingInterval: 5
+  maxReplicaCount: ${maxReplicaCount}
+  cooldownPeriod: 10
+  triggers:
+    - type: gcp-pubsub
+      metadata:
+        subscriptionName: ${subscriptionName}
+        mode: SubscriptionSize
+        value: "5"
+        credentialsFromEnv: GOOGLE_APPLICATION_CREDENTIALS_JSON
+`
+
+const gcpSdkYaml = `apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: gcp-sdk
+  namespace: ${testNamespace}
+  labels:
+    app: gcp-sdk
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: gcp-sdk
+  template:
+    metadata:
+      labels:
+        app: gcp-sdk
+    spec:
+      containers:
+        - name: gcp-sdk-container
+          image: google/cloud-sdk:slim
+          # Just spin & wait forever
+          command: [ "/bin/bash", "-c", "--" ]
+          args: [ "while true; do sleep 30; done;" ]
+          volumeMounts:
+            - name: secret-volume
+              mountPath: /etc/secret-volume
+      volumes:
+        - name: secret-volume
+          secret:
+            secretName: pubsub-secrets
+`
+
+const serviceAccountJson = `{
+  }` // Json key with \n converted to \\n