cloudfns/wikiwebhook: set GCP_PROJECT env var explicitly

Prior to CL 230637, this cloud function was targeting the Go 1.11
runtime, which implicitly¹ set the GCP_PROJECT environment variable.
That no longer happens with the newer Go runtime², so set the same
variable explicitly, otherwise publishing to the topic fails.

Remove a defer r.Body.Close() line; the http.Request body is closed
by the http.Server, http.Handler does not need to.

Also update the version of pubsub package to the latest. It isn't
needed to fix the problem, but it has already been tested during
debugging, so it's inexpensive to include.

A future enhancement is to factor out the pubsub client creation
to happen once per function instance rather than per invocation³,
and use metadata.ProjectID instead of needing an explicit env var.

¹ https://cloud.google.com/functions/docs/env-var#nodejs_8_python_37_and_go_111
² https://cloud.google.com/functions/docs/env-var#newer_runtimes
³ https://cloud.google.com/functions/docs/concepts/go-runtime#one-time_initialization

Fixes golang/go#44948.

Change-Id: I03fd66c7fb784cef24c5759b45cb7c10ed17ee6a
Reviewed-on: https://go-review.googlesource.com/c/build/+/302549
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
diff --git a/cloudfns/wikiwebhook/README.md b/cloudfns/wikiwebhook/README.md
index a6586ad..3274274 100644
--- a/cloudfns/wikiwebhook/README.md
+++ b/cloudfns/wikiwebhook/README.md
@@ -14,5 +14,5 @@
   --project=symbolic-datum-552 \
   --runtime go113 \
   --trigger-http \
-  --set-env-vars="PUBSUB_TOPIC=github.webhooks.golang.go.wiki,GITHUB_WEBHOOK_SECRET=$(gcloud --project=symbolic-datum-552 secrets versions access latest --secret=github-webhook-secret)"
+  --set-env-vars="PUBSUB_TOPIC=github.webhooks.golang.go.wiki,GCP_PROJECT=symbolic-datum-552,GITHUB_WEBHOOK_SECRET=$(gcloud --project=symbolic-datum-552 secrets versions access latest --secret=github-webhook-secret)"
 ```
diff --git a/cloudfns/wikiwebhook/go.mod b/cloudfns/wikiwebhook/go.mod
index a653bc0..917f1b5 100644
--- a/cloudfns/wikiwebhook/go.mod
+++ b/cloudfns/wikiwebhook/go.mod
@@ -2,11 +2,4 @@
 
 go 1.13
 
-require (
-	cloud.google.com/go v0.34.0
-	github.com/googleapis/gax-go v2.0.2+incompatible // indirect
-	golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 // indirect
-	google.golang.org/api v0.1.0 // indirect
-	google.golang.org/genproto v0.0.0-20190111180523-db91494dd46c // indirect
-	google.golang.org/grpc v1.18.0 // indirect
-)
+require cloud.google.com/go/pubsub v1.10.1
diff --git a/cloudfns/wikiwebhook/go.sum b/cloudfns/wikiwebhook/go.sum
index deb8218..daac81b 100644
--- a/cloudfns/wikiwebhook/go.sum
+++ b/cloudfns/wikiwebhook/go.sum
@@ -1,66 +1,450 @@
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diff --git a/cloudfns/wikiwebhook/wikiwebhook.go b/cloudfns/wikiwebhook/wikiwebhook.go
index 9daca95..51c0da4 100644
--- a/cloudfns/wikiwebhook/wikiwebhook.go
+++ b/cloudfns/wikiwebhook/wikiwebhook.go
@@ -27,7 +27,6 @@
 )
 
 func GitHubWikiChangeWebHook(w http.ResponseWriter, r *http.Request) {
-	defer r.Body.Close()
 	body, err := ioutil.ReadAll(r.Body)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "Could not read request body: %v", err)
@@ -64,7 +63,13 @@
 // publishToTopic publishes body to the given topic.
 // It returns the ID of the message published.
 var publishToTopic = func(topic string, body []byte) (string, error) {
+	// TODO(dmitshur): Can factor out pubsub.NewClient to run once at init time as suggested at
+	// https://cloud.google.com/functions/docs/concepts/go-runtime#one-time_initialization, and
+	// determine projectID via metadata.ProjectID instead of needing the GCP_PROJECT env var.
 	ctx := context.Background()
+	if projectID == "" {
+		return "", fmt.Errorf("projectID is an empty string")
+	}
 	client, err := pubsub.NewClient(ctx, projectID)
 	if err != nil {
 		return "", fmt.Errorf("pubsub.NewClient: %v", err)