demo script updates (#934)

Demo script updates.  Record-replay, a bugfix in the canary demo script, etc.

demos/declarative-specs/cleanup.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+fission spec destroy
+
+# this one is generated in run.sh
+rm specs/function-hello-go.yaml
+
+rm *.~?~
+

demos/declarative-specs/hello.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"net/http"
+)
+
+// Handler is the entry point for this fission function
+
+func Handler(w http.ResponseWriter, r *http.Request) {
+	msg := "Hello, CNCF Webinar!\n"
+	w.Write([]byte(msg))
+}

demos/declarative-specs/run.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+DEMO_RUN_FAST=1
+ROOT_DIR=$(dirname $0)/..
+. $ROOT_DIR/util.sh
+
+desc "Declaratively specified app"
+run "ls specs"
+
+desc "Generate initial YAML, so we don't have to write it by hand"
+run "fission function create --spec --name hello-go --env go --src hello.go --entrypoint Handler"
+
+desc "Generated function YAML"
+run "tail -25 specs/function-hello-go.yaml"
+
+desc "Deploy on cluster, and wait for build result"
+run "fission spec apply --wait"
+
+desc "Invoke the function"
+run "fission function test --name hello-go"
+
+desc "Live-reload: auto build + deploy on save"
+run "fission spec apply --watch"
+

demos/declarative-specs/specs/README

@@ -0,0 +1,42 @@
+
+Fission Specs
+=============
+
+This is a set of specifications for a Fission app.  This includes functions,
+environments, and triggers; we collectively call these things "resources".
+
+How to use these specs
+----------------------
+
+These specs are handled with the 'fission spec' command.  See 'fission spec --help'.
+
+'fission spec apply' will "apply" all resources specified in this directory to your
+cluster.  That means it checks what resources exist on your cluster, what resources are
+specified in the specs directory, and reconciles the difference by creating, updating or
+deleting resources on the cluster.
+
+'fission spec apply' will also package up your source code (or compiled binaries) and
+upload the archives to the cluster if needed.  It uses 'ArchiveUploadSpec' resources in
+this directory to figure out which files to archive.
+
+You can use 'fission spec apply --watch' to watch for file changes and continuously keep
+the cluster updated.
+
+You can add YAMLs to this directory by writing them manually, but it's easier to generate
+them.  Use 'fission function create --spec' to generate a function spec,
+'fission environment create --spec' to generate an environment spec, and so on.
+
+You can edit any of the files in this directory, except 'fission-deployment-config.yaml',
+which contains a UID that you should never change.  To apply your changes simply use
+'fission spec apply'.
+
+fission-deployment-config.yaml
+------------------------------
+
+fission-deployment-config.yaml contains a UID.  This UID is what fission uses to correlate
+resources on the cluster to resources in this directory.
+
+All resources created by 'fission spec apply' are annotated with this UID.  Resources on
+the cluster that are _not_ annotated with this UID are never modified or deleted by
+fission.
+

demos/declarative-specs/specs/fission-deployment-config.yaml

@@ -0,0 +1,7 @@
+# This file is generated by the 'fission spec init' command.
+# See the README in this directory for background and usage information.
+# Do not edit the UID below: that will break 'fission spec apply'
+apiVersion: fission.io/v1
+kind: DeploymentConfig
+name: declarative-specs
+uid: e20fe7b4-b012-4ae0-98bd-0f968d21d397

demos/declarative-specs/specs/function-hello-go.yaml

@@ -0,0 +1,51 @@
+include:
+- hello.go
+kind: ArchiveUploadSpec
+name: hello-go
+
+---
+apiVersion: fission.io/v1
+kind: Package
+metadata:
+  creationTimestamp: null
+  name: hello-go-xfxy
+  namespace: default
+spec:
+  deployment:
+    checksum: {}
+  environment:
+    name: go
+    namespace: default
+  source:
+    checksum: {}
+    type: url
+    url: archive://hello-go
+status:
+  buildstatus: pending
+
+---
+apiVersion: fission.io/v1
+kind: Function
+metadata:
+  creationTimestamp: null
+  name: hello-go
+  namespace: default
+spec:
+  InvokeStrategy:
+    ExecutionStrategy:
+      ExecutorType: poolmgr
+      MaxScale: 1
+      MinScale: 0
+      TargetCPUPercent: 80
+    StrategyType: execution
+  configmaps: null
+  environment:
+    name: go
+    namespace: default
+  package:
+    functionName: Handler
+    packageref:
+      name: hello-go-xfxy
+      namespace: default
+  resources: {}
+  secrets: null