activator for 0->1 case

BUILD.bazel

@@ -32,6 +32,14 @@ k8s_object(
     template = "webhook.yaml",
 )
 
+k8s_object(
+    name = "activator",
+    images = {
+        "ela-activator:latest": "//cmd/ela-activator:image",
+    },
+    template = "activator.yaml",
+)
+
 k8s_object(
     name = "namespace",
     template = "namespace.yaml",
@@ -57,6 +65,11 @@ k8s_object(
     template = "elawebhookservice.yaml",
 )
 
+k8s_object(
+    name = "ela-activator-service",
+    template = "ela-activator-service.yaml",
+)
+
 k8s_object(
     name = "configuration",
     template = "configuration.yaml",
@@ -109,6 +122,8 @@ k8s_objects(
         ":controllerservice",
         ":webhook",
         ":elawebhookservice",
+        ":activator",
+        ":ela-activator-service",
     ],
 )
 

activator.yaml

@@ -0,0 +1,39 @@
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: apps/v1beta1
+kind: Deployment
+metadata:
+  name: ela-activator
+  namespace: ela-system
+spec:
+  # TODO: Increase the replicas
+  # https://github.com/elafros/elafros/issues/695
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: ela-activator
+        role: ela-activator
+    spec:
+      serviceAccountName: ela-controller
+      containers:
+      - name: ela-activator
+        image: ela-activator:latest
+        ports:
+        - name: http
+          containerPort: 8080
+        args:
+        - "-logtostderr=true"
+        - "-stderrthreshold=INFO"

cmd/ela-activator/BUILD.bazel

@@ -0,0 +1,31 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["main.go"],
+    importpath = "github.com/elafros/elafros/cmd/ela-activator",
+    visibility = ["//visibility:private"],
+    deps = [
+        "//pkg/activator:go_default_library",
+        "//pkg/client/clientset/versioned:go_default_library",
+        "//pkg/signals:go_default_library",
+        "//vendor/github.com/golang/glog:go_default_library",
+        "//vendor/k8s.io/client-go/kubernetes:go_default_library",
+        "//vendor/k8s.io/client-go/rest:go_default_library",
+    ],
+)
+
+go_binary(
+    name = "ela-activator",
+    embed = [":go_default_library"],
+    pure = "on",
+    visibility = ["//visibility:public"],
+)
+
+load("@io_bazel_rules_docker//go:image.bzl", "go_image")
+
+go_image(
+    name = "image",
+    binary = ":ela-activator",
+    visibility = ["//visibility:public"],
+)

cmd/ela-activator/main.go

@@ -0,0 +1,54 @@
+/*
+Copyright 2018 Google Inc. All Rights Reserved.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"flag"
+	"net/http"
+
+	"github.com/elafros/elafros/pkg/activator"
+	clientset "github.com/elafros/elafros/pkg/client/clientset/versioned"
+	"github.com/elafros/elafros/pkg/signals"
+	"github.com/golang/glog"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+)
+
+func main() {
+	flag.Parse()
+	glog.Info("Starting the elafros activator...")
+
+	// set up signals so we handle the first shutdown signal gracefully
+	stopCh := signals.SetupSignalHandler()
+
+	clusterConfig, err := rest.InClusterConfig()
+	if err != nil {
+		glog.Fatal(err)
+	}
+	kubeClient, err := kubernetes.NewForConfig(clusterConfig)
+	if err != nil {
+		glog.Fatal(err)
+	}
+	elaClient, err := clientset.NewForConfig(clusterConfig)
+	if err != nil {
+		glog.Fatalf("Error building ela clientset: %v", err)
+	}
+	a, err := activator.NewActivator(kubeClient, elaClient, http.DefaultTransport.(*http.Transport))
+	if err != nil {
+		glog.Fatalf("Failed to create an activator: %v", err)
+	}
+
+	a.Run(stopCh)
+	glog.Flush()
+}

controller.yaml

@@ -37,6 +37,8 @@ spec:
         - ela-queue:latest
         - "-autoscalerImage"
         - ela-autoscaler:latest
+        # The flag to turn on the activator.
+        - "-enableActivatorExperiment=false"
         ports:
         - name: metrics
           containerPort: 9090

ela-activator-service.yaml

@@ -0,0 +1,30 @@
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: v1
+kind: Service
+metadata:
+  name: activator-service
+  namespace: ela-system
+  labels:
+    app: ela-activator
+spec:
+  selector:
+    app: ela-activator
+  ports:
+  - name: http
+    protocol: TCP
+    port: 80
+    targetPort: 8080
+  type: NodePort

pkg/activator/BUILD.bazel

@@ -0,0 +1,34 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "activator.go",
+    ],
+    importpath = "github.com/elafros/elafros/pkg/activator",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//pkg/apis/ela/v1alpha1:go_default_library",
+        "//pkg/client/clientset/versioned:go_default_library",
+        "//pkg/controller:go_default_library",
+        "//vendor/github.com/golang/glog:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/api/errors:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
+        "//vendor/k8s.io/client-go/kubernetes:go_default_library",
+        "//vendor/k8s.io/client-go/util/workqueue:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/watch:go_default_library",
+    ],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["activator_test.go"],
+    embed = [":go_default_library"],
+    deps = [
+        "//pkg/apis/ela:go_default_library",
+        "//pkg/client/clientset/versioned/fake:go_default_library",
+        "//vendor/k8s.io/api/core/v1:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/util/intstr:go_default_library",
+        "//vendor/k8s.io/client-go/kubernetes/fake:go_default_library",
+    ],
+)

pkg/activator/README.md

@@ -0,0 +1 @@
+See the [section](https://github.com/elafros/elafros/blob/master/pkg/autoscaler/README.md#activator) in the Autoscaler documentation.