Bug 1591564 - Assemble a 'prototype' ping every hour. r=janerik

Differential Revision: https://phabricator.services.mozilla.com/D57106

--HG--
extra : moz-landing-system : lando

toolkit/components/telemetry/fog/src/lib.rs

@@ -3,8 +3,12 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use glean_preview::Configuration;
+use glean_preview::metrics::PingType;
 use nserror::{nsresult, NS_ERROR_FAILURE, NS_OK};
 use nsstring::nsAString;
+use std::{thread, time};
+use std::io::Error;
+use std::thread::JoinHandle;
 
 #[no_mangle]
 pub unsafe extern "C" fn fog_init(upload_enabled: bool, data_dir: &nsAString) -> nsresult {
@@ -20,5 +24,24 @@ pub unsafe extern "C" fn fog_init(upload_enabled: bool, data_dir: &nsAString) ->
     return NS_ERROR_FAILURE
   }
 
+  // We ignore the returned JoinHandle for the nonce.
+  // The detached thread will live until this process (the main process) dies.
+  if prototype_ping_init().is_err() {
+    return NS_ERROR_FAILURE
+  }
+
   NS_OK
 }
+
+fn prototype_ping_init() -> Result<JoinHandle<()>, Error> {
+  thread::Builder::new().name("fogotype_ping".to_owned()).spawn(|| {
+    let prototype_ping = PingType::new("prototype", true, true);
+    glean_preview::register_ping_type(&prototype_ping);
+
+    let an_hour = time::Duration::from_secs(60 * 60);
+    loop {
+      thread::sleep(an_hour);
+      prototype_ping.send();
+    }
+  })
+}