1 files changed, 85 insertions, 0 deletions
diff --git a/devtools/shared/commands/tracer/tracer-command.js b/devtools/shared/commands/tracer/tracer-command.js
new file mode 100644
index 0000000000..f512c15d9e
--- /dev/null
+++ b/devtools/shared/commands/tracer/tracer-command.js
@@ -0,0 +1,85 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+class TracerCommand {
+  constructor({ commands }) {
+    this.#targetCommand = commands.targetCommand;
+    this.#targetConfigurationCommand = commands.targetConfigurationCommand;
+    this.#resourceCommand = commands.resourceCommand;
+  }
+
+  #resourceCommand;
+  #targetCommand;
+  #targetConfigurationCommand;
+  #isTracing = false;
+
+  async initialize() {
+    return this.#resourceCommand.watchResources(
+      [this.#resourceCommand.TYPES.JSTRACER_STATE],
+      { onAvailable: this.onResourcesAvailable }
+    );
+  }
+  destroy() {
+    this.#resourceCommand.unwatchResources(
+      [this.#resourceCommand.TYPES.JSTRACER_STATE],
+      { onAvailable: this.onResourcesAvailable }
+    );
+  }
+
+  onResourcesAvailable = resources => {
+    for (const resource of resources) {
+      if (resource.resourceType != this.#resourceCommand.TYPES.JSTRACER_STATE) {
+        continue;
+      }
+      this.#isTracing = resource.enabled;
+    }
+  };
+
+  /**
+   * Get the dictionary passed to the server codebase as a SessionData.
+   * This contains all settings to fine tune the tracer actual behavior.
+   *
+   * @return {JSON}
+   *         Configuration object.
+   */
+  #getTracingOptions() {
+    return {
+      logMethod: Services.prefs.getStringPref(
+        "devtools.debugger.javascript-tracing-log-method",
+        ""
+      ),
+      traceValues: Services.prefs.getBoolPref(
+        "devtools.debugger.javascript-tracing-values",
+        false
+      ),
+      traceOnNextInteraction: Services.prefs.getBoolPref(
+        "devtools.debugger.javascript-tracing-on-next-interaction",
+        false
+      ),
+      traceOnNextLoad: Services.prefs.getBoolPref(
+        "devtools.debugger.javascript-tracing-on-next-load",
+        false
+      ),
+      traceFunctionReturn: Services.prefs.getBoolPref(
+        "devtools.debugger.javascript-tracing-function-return",
+        false
+      ),
+    };
+  }
+
+  /**
+   * Toggle JavaScript tracing for all targets.
+   */
+  async toggle() {
+    this.#isTracing = !this.#isTracing;
+
+    await this.#targetConfigurationCommand.updateConfiguration({
+      tracerOptions: this.#isTracing ? this.#getTracingOptions() : undefined,
+    });
+  }
+}
+
+module.exports = TracerCommand;