Backed out changeset cd8049475224 (bug 1218576)

toolkit/components/telemetry/TelemetrySession.jsm

@@ -57,6 +57,7 @@ const PREF_UNIFIED = PREF_BRANCH + "unified";
 
 
 const MESSAGE_TELEMETRY_PAYLOAD = "Telemetry:Payload";
+const MESSAGE_TELEMETRY_GET_CHILD_PAYLOAD = "Telemetry:GetChildPayload";
 const MESSAGE_TELEMETRY_THREAD_HANGS = "Telemetry:ChildThreadHangs";
 const MESSAGE_TELEMETRY_GET_CHILD_THREAD_HANGS = "Telemetry:GetChildThreadHangs";
 const MESSAGE_TELEMETRY_USS = "Telemetry:USS";
@@ -539,6 +540,13 @@ this.TelemetrySession = Object.freeze({
   getPayload: function(reason, clearSubsession = false) {
     return Impl.getPayload(reason, clearSubsession);
   },
+  /**
+   * Asks the content processes to send their payloads.
+   * @returns Object
+   */
+  requestChildPayloads: function() {
+    return Impl.requestChildPayloads();
+  },
   /**
    * Returns a promise that resolves to an array of thread hang stats from content processes, one entry per process.
    * The structure of each entry is identical to that of "threadHangStats" in nsITelemetry.
@@ -1513,6 +1521,7 @@ var Impl = {
     }
 
     Services.obs.addObserver(this, "content-child-shutdown", false);
+    cpml.addMessageListener(MESSAGE_TELEMETRY_GET_CHILD_PAYLOAD, this);
     cpml.addMessageListener(MESSAGE_TELEMETRY_GET_CHILD_THREAD_HANGS, this);
     cpml.addMessageListener(MESSAGE_TELEMETRY_GET_CHILD_USS, this);
 
@@ -1550,6 +1559,14 @@ var Impl = {
       let source = message.data.childUUID;
       delete message.data.childUUID;
 
+      for (let child of this._childTelemetry) {
+        if (child.source === source) {
+          // Update existing telemetry data.
+          child.payload = message.data;
+          return;
+        }
+      }
+      // Did not find existing child in this._childTelemetry.
       this._childTelemetry.push({
         source: source,
         payload: message.data,
@@ -1562,6 +1579,12 @@ var Impl = {
 
       break;
     }
+    case MESSAGE_TELEMETRY_GET_CHILD_PAYLOAD:
+    {
+      // In child process, send the requested Telemetry payload
+      this.sendContentProcessPing("saved-session");
+      break;
+    }
     case MESSAGE_TELEMETRY_THREAD_HANGS:
     {
       // Accumulate child thread hang stats from this child
@@ -1741,6 +1764,11 @@ var Impl = {
     return this.getSessionPayload(reason, clearSubsession);
   },
 
+  requestChildPayloads: function() {
+    this._log.trace("requestChildPayloads");
+    ppmm.broadcastAsyncMessage(MESSAGE_TELEMETRY_GET_CHILD_PAYLOAD, {});
+  },
+
   getChildThreadHangs: function getChildThreadHangs() {
     return new Promise((resolve) => {
       // Return immediately if there are no child processes to get stats from