internal/server: make MaybePromptForTelemetry no-op

For the transition of vscode go extension users who explicitly trigger
prompting using the command, make the command no-op if the telemetry
prompt setting is already true.

For golang/go#67821

Change-Id: I648c5a8e4449eeb15fb28c71879c967975363a79
Reviewed-on: https://go-review.googlesource.com/c/tools/+/589836
Auto-Submit: Hyang-Ah Hana Kim <hyangah@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Robert Findley <rfindley@google.com>

gopls/internal/server/command.go

@@ -256,7 +256,11 @@ func (h *commandHandler) Packages(ctx context.Context, args command.PackagesArgs
 }
 
 func (h *commandHandler) MaybePromptForTelemetry(ctx context.Context) error {
-	go h.s.maybePromptForTelemetry(ctx, true)
+	// if the server's TelemetryPrompt is true, it's likely the server already
+	// handled prompting for it. Don't try to prompt again.
+	if !h.s.options.TelemetryPrompt {
+		go h.s.maybePromptForTelemetry(ctx, true)
+	}
 	return nil
 }
 

gopls/internal/server/prompt.go

@@ -162,6 +162,7 @@ func (s *server) maybePromptForTelemetry(ctx context.Context, enabled bool) {
 			//  v0.17 ~: must have all four fields.
 		} else {
 			state, attempts, creationTime, token = pUnknown, 0, 0, 0
+			// TODO(hyangah): why do we want to present this as an error to user?
 			errorf("malformed prompt result %q", string(content))
 		}
 	} else if !os.IsNotExist(err) {