1 files changed, 101 insertions, 0 deletions
diff --git a/browser/extensions/screenshots/catcher.js b/browser/extensions/screenshots/catcher.js
new file mode 100644
index 0000000000..0c3f544141
--- /dev/null
+++ b/browser/extensions/screenshots/catcher.js
@@ -0,0 +1,101 @@
+/* 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";
+
+// eslint-disable-next-line no-var
+var global = this;
+
+this.catcher = (function() {
+  const exports = {};
+
+  let handler;
+
+  let queue = [];
+
+  const log = global.log;
+
+  exports.unhandled = function(error, info) {
+    if (!error.noReport) {
+      log.error("Unhandled error:", error, info);
+    }
+    const e = makeError(error, info);
+    if (!handler) {
+      queue.push(e);
+    } else {
+      handler(e);
+    }
+  };
+
+  /** Turn an exception into an error object */
+  function makeError(exc, info) {
+    let result;
+    if (exc.fromMakeError) {
+      result = exc;
+    } else {
+      result = {
+        fromMakeError: true,
+        name: exc.name || "ERROR",
+        message: String(exc),
+        stack: exc.stack,
+      };
+      for (const attr in exc) {
+        result[attr] = exc[attr];
+      }
+    }
+    if (info) {
+      for (const attr of Object.keys(info)) {
+        result[attr] = info[attr];
+      }
+    }
+    return result;
+  }
+
+  /** Wrap the function, and if it raises any exceptions then call unhandled() */
+  exports.watchFunction = function watchFunction(func, quiet) {
+    return function() {
+      try {
+        return func.apply(this, arguments);
+      } catch (e) {
+        if (!quiet) {
+          exports.unhandled(e);
+        }
+        throw e;
+      }
+    };
+  };
+
+  exports.watchPromise = function watchPromise(promise, quiet) {
+    return promise.catch(e => {
+      if (quiet) {
+        if (!e.noReport) {
+          log.debug("------Error in promise:", e);
+          log.debug(e.stack);
+        }
+      } else {
+        if (!e.noReport) {
+          log.error("------Error in promise:", e);
+          log.error(e.stack);
+        }
+        exports.unhandled(makeError(e));
+      }
+      throw e;
+    });
+  };
+
+  exports.registerHandler = function(h) {
+    if (handler) {
+      log.error("registerHandler called after handler was already registered");
+      return;
+    }
+    handler = h;
+    for (const error of queue) {
+      handler(error);
+    }
+    queue = [];
+  };
+
+  return exports;
+})();
+null;