Update the iot-core demo to use Broker rather than Channel (#1103)

* Update the iot-core demo to use Broker rather than Channel. Also remove ko and kail usage.

* Update docs/eventing/samples/iot-core/README.md

Co-Authored-By: Harwayne <harwayne@google.com>

docs/eventing/samples/iot-core/README.md

@@ -24,7 +24,6 @@ export IOTCORE_PROJECT="s9-demo"
 #### Variables you may Change
 
 ```shell
-export CHANNEL_NAME="iot-demo"
 export IOTCORE_REGISTRY="iot-demo"
 export IOTCORE_DEVICE="iot-demo-client"
 export IOTCORE_REGION="us-central1"
@@ -34,12 +33,6 @@ export IOTCORE_TOPIC_DEVICE="iot-demo-device-pubsub-topic"
 
 ### Prerequisites
 
-#### Local
-
-1.  Clone
-    [Knative Eventing Sources](https://github.com/knative/eventing-sources)
-    locally.
-
 #### Kubernetes
 
 1.  Have a running Kubernetes cluster with `kubectl` pointing at it.
@@ -67,13 +60,6 @@ export IOTCORE_TOPIC_DEVICE="iot-demo-device-pubsub-topic"
 
 1.  Setup [Knative Eventing](../../../eventing).
 
-1.  Install the
-    [in-memory `ClusterChannelProvisioner`](https://github.com/knative/eventing/tree/master/config/provisioners/in-memory-channel).
-
-    - Note that you can skip this if you choose to use a different type of
-      `Channel`. If so, you will need to modify `channel.yaml` before deploying
-      it.
-
 #### GCP PubSub Source
 
 1.  Create a GCP
@@ -94,20 +80,17 @@ export IOTCORE_TOPIC_DEVICE="iot-demo-device-pubsub-topic"
     controller.
 
     ```shell
-    pushd $HOME/go/src/github.com/knative/eventing-sources
+    kubectl apply --filename https://github.com/knative/eventing-sources/releases/download/v0.5.0/gcppubsub.yaml
-    ko apply --filename config/default-gcppubsub.yaml
-    popd
     ```
 
 ### Deploying
 
-#### Channel
+#### Broker
 
-1.  Create a `Channel`.
+1. Install the default `Broker`.
 
     ```shell
-    sed "s/CHANNEL_NAME/$CHANNEL_NAME/" channel.yaml |
+    kubectl label namespace default knative-eventing-injection=enabled
-    kubectl --namespace default apply --filename -
     ```
 
 #### GCP PubSub Source
@@ -115,23 +98,21 @@ export IOTCORE_TOPIC_DEVICE="iot-demo-device-pubsub-topic"
 1.  Deploy `gcp-pubsub-source.yaml`.
 
     ```shell
-    sed -e "s/MY_GCP_PROJECT/$IOTCORE_PROJECT/" \
+    sed -e "s/PROJECT_ID/$IOTCORE_PROJECT/" \
         -e "s/TOPIC_NAME/$IOTCORE_TOPIC_DATA/" \
-        -e "s/CHANNEL_NAME/$CHANNEL_NAME/" \
+        docs/eventing/samples/iot-core/gcp-pubsub-source.yaml |
-        gcp-pubsub-source.yaml |
     kubectl apply --filename -
     ```
 
-#### Subscription
+#### Trigger
 
 Even though the `Source` isn't completely ready yet, we can setup the
-`Subscription` for all events coming out of it.
+`Trigger` for all events coming out of it.
 
-1.  Deploy `subscription.yaml`.
+1.  Deploy `trigger.yaml`.
 
     ```shell
-    sed "s/CHANNEL_NAME/$CHANNEL_NAME/" subscription.yaml |
+    kubectl apply --filename docs/eventing/samples/iot-core/trigger.yaml
-    ko apply --filename -
     ```
 
     - This uses a very simple Knative Service to see that events are flowing.
@@ -178,14 +159,7 @@ Core.
 We now have everything installed and ready to go. We will generate events and
 see them in the subscriber.
 
-1.  Setup [`kail`](https://github.com/boz/kail) to tail the logs of the
+1.  Run the following program to generate events:
-    subscriber.
-
-    ```shell
-    kail -d message-dumper -c user-container
-    ```
-
-1.  In a separate terminal, run the following program to generate events.
 
     ```shell
     go run github.com/knative/docs/docs/eventing/samples/iot-core/generator \
@@ -199,37 +173,39 @@ see them in the subscriber.
         -events 10
     ```
 
+1. Inspect the logs of the subscriber:
+
+    ```shell
+    kubectl logs --selector serving.knative.dev/service=message-dumper -c user-container
+    ```
+
+    You should see something along the similar to:
+    
+    ```shell
+    {"ID":"481014114648052","Data":"eyJzb3VyY2VfaWQiOiJpb3QtY29yZSBkZW1vIiwiZXZlbnRfaWQiOiJlaWQtMzI3MjJiMzItZWU5Mi00YzZlLWEzOTgtNDlmYjRkYWYyNGE1IiwiZXZlbnRfdHMiOjE1NTM3MTczOTYsIm1ldHJpYyI6MC4xMzY1MjI5OH0=","Attributes":{"deviceId":"iot-demo-client","deviceNumId":"2754785852315736","deviceRegistryId":"iot-demo","deviceRegistryLocation":"us-central1","projectId":"s9-demo","subFolder":""},"PublishTime":"2019-03-27T20:09:56.685Z"}
+
 ### Cleanup
 
 To cleanup the knative resources:
 
-1.  Remove the gcppubsub controller:
+1.  Remove the `GcpPubSubSource`:
 
     ```shell
-    pushd $HOME/go/src/github.com/knative/eventing-sources
+    sed -e "s/PROJECT_ID/$IOTCORE_PROJECT/" \
-    kubectl delete --filename config/default-gcppubsub.yaml
-    popd
-    ```
-
-2.  Remove the channel:
-
-    ```shell
-    sed "s/CHANNEL_NAME/$CHANNEL_NAME/" channel.yaml |
-    kubectl --namespace default delete --filename -
-    ```
-
-3.  Remove the gcppubsub source:
-
-    ```shell
-    sed -e "s/MY_GCP_PROJECT/$IOTCORE_PROJECT/" \
         -e "s/TOPIC_NAME/$IOTCORE_TOPIC_DATA/" \
-        -e "s/CHANNEL_NAME/$CHANNEL_NAME/" \
+        docs/eventing/samples/iot-core/gcp-pubsub-source.yaml |
-        gcp-pubsub-source.yaml |
     kubectl delete --filename -
     ```
     
-4.  Remove the subscription:
+1.  Remove the Trigger:
+
     ```shell
-    sed "s/CHANNEL_NAME/$CHANNEL_NAME/" subscription.yaml |
+    kubectl delete --filename docs/eventing/samples/iot-core/trigger.yaml
-    kubectl delete --filename -
     ```
+
+1.  Remove the `GcpPubSubSource` controller:
+
+    ```shell
+    kubectl delete --filename https://github.com/knative/eventing-sources/releases/download/v0.5.0/gcppubsub.yaml
+    ```
+

docs/eventing/samples/iot-core/channel.yaml

@@ -1,10 +0,0 @@
-apiVersion: eventing.knative.dev/v1alpha1
-kind: Channel
-metadata:
-  name: CHANNEL_NAME
-  namespace: default
-spec:
-  provisioner:
-    apiVersion: eventing.knative.dev/v1alpha1
-    kind: ClusterChannelProvisioner
-    name: in-memory-channel

docs/eventing/samples/iot-core/gcp-pubsub-source.yaml

@@ -10,9 +10,9 @@ spec:
   gcpCredsSecret:
     name: google-cloud-key
     key: key.json
-  googleCloudProject: MY_GCP_PROJECT
+  googleCloudProject: PROJECT_ID
   topic: TOPIC_NAME
   sink:
     apiVersion: eventing.knative.dev/v1alpha1
-    kind: Channel
+    kind: Broker
-    name: CHANNEL_NAME
+    name: default

docs/eventing/samples/iot-core/trigger.yaml

@@ -1,13 +1,9 @@
 apiVersion: eventing.knative.dev/v1alpha1
-kind: Subscription
+kind: Trigger
 metadata:
   name: iot-demo
   namespace: default
 spec:
-  channel:
-    apiVersion: eventing.knative.dev/v1alpha1
-    kind: Channel
-    name: CHANNEL_NAME
   subscriber:
     ref:
       apiVersion: serving.knative.dev/v1alpha1
@@ -28,4 +24,6 @@ spec:
       revisionTemplate:
         spec:
           container:
-            image: github.com/knative/eventing-sources/cmd/message_dumper
+            # This corresponds to
+            # https://github.com/knative/eventing-sources/blob/release-0.3/cmd/message_dumper/dumper.go
+            image: gcr.io/knative-releases/github.com/knative/eventing-sources/cmd/message_dumper@sha256:8423232db7a7b4010c0cfbfaef95745efe962631af9b7456903825801a7893f7