Don't wait for frame indefinitely

This needs a better fix in Capybara, see
https://github.com/jnicklas/capybara/issues/984#issuecomment-14347198

lib/capybara/poltergeist/browser.rb

@@ -1,8 +1,14 @@
+require "capybara/poltergeist/errors"
 require 'json'
 require 'time'
 
 module Capybara::Poltergeist
   class Browser
+    ERROR_MAPPINGS = {
+      "Poltergeist.JavascriptError" => JavascriptError,
+      "Poltergeist.FrameNotFound"   => FrameNotFound
+    }
+
     attr_reader :server, :client, :logger
 
     def initialize(server, client, logger = nil)
@@ -193,14 +199,11 @@ module Capybara::Poltergeist
       log json.inspect
 
       if json['error']
-        if json['error']['name'] == 'Poltergeist.JavascriptError'
+        klass = ERROR_MAPPINGS[json['error']['name']] || BrowserError
-          raise JavascriptError.new(json['error'])
+        raise klass.new(json['error'])
       else
-          raise BrowserError.new(json['error'])
-        end
-      end
         json['response']
-
+      end
     rescue DeadClient
       restart
       raise

lib/capybara/poltergeist/client/browser.coffee

@@ -145,16 +145,17 @@ class Poltergeist.Browser
     @page.execute("function() { #{script} }")
     this.sendResponse(true)
 
-  push_frame: (name) ->
+  push_frame: (name, timeout = new Date().getTime() + 2000) ->
     if @page.pushFrame(name)
       if @page.currentUrl() == 'about:blank'
         this.setState 'awaiting_frame_load'
       else
         this.sendResponse(true)
     else
-      # There's currently no PhantomJS callback available for frame creation,
+      if new Date().getTime() < timeout
-      # so we have to poll
+        setTimeout((=> this.push_frame(name, timeout)), 50)
-      setTimeout((=> this.push_frame(name)), 50)
+      else
+        @owner.sendError(new Poltergeist.FrameNotFound(name))
 
   pop_frame: ->
     this.sendResponse(@page.popFrame())

lib/capybara/poltergeist/client/compiled/browser.js

@@ -182,8 +182,11 @@ Poltergeist.Browser = (function() {
     return this.sendResponse(true);
   };
 
-  Browser.prototype.push_frame = function(name) {
+  Browser.prototype.push_frame = function(name, timeout) {
     var _this = this;
+    if (timeout == null) {
+      timeout = new Date().getTime() + 2000;
+    }
     if (this.page.pushFrame(name)) {
       if (this.page.currentUrl() === 'about:blank') {
         return this.setState('awaiting_frame_load');
@@ -191,9 +194,13 @@ Poltergeist.Browser = (function() {
         return this.sendResponse(true);
       }
     } else {
+      if (new Date().getTime() < timeout) {
         return setTimeout((function() {
-        return _this.push_frame(name);
+          return _this.push_frame(name, timeout);
         }), 50);
+      } else {
+        return this.owner.sendError(new Poltergeist.FrameNotFound(name));
+      }
     }
   };
 

lib/capybara/poltergeist/client/compiled/main.js

@@ -86,6 +86,24 @@ Poltergeist.ObsoleteNode = (function(_super) {
 
 })(Poltergeist.Error);
 
+Poltergeist.FrameNotFound = (function(_super) {
+
+  __extends(FrameNotFound, _super);
+
+  function FrameNotFound(frameName) {
+    this.frameName = frameName;
+  }
+
+  FrameNotFound.prototype.name = "Poltergeist.FrameNotFound";
+
+  FrameNotFound.prototype.args = function() {
+    return [this.frameName];
+  };
+
+  return FrameNotFound;
+
+})(Poltergeist.Error);
+
 Poltergeist.ClickFailed = (function(_super) {
 
   __extends(ClickFailed, _super);

lib/capybara/poltergeist/client/main.coffee

@@ -50,6 +50,11 @@ class Poltergeist.ObsoleteNode extends Poltergeist.Error
   args: -> []
   toString: -> this.name
 
+class Poltergeist.FrameNotFound extends Poltergeist.Error
+  constructor: (@frameName) ->
+  name: "Poltergeist.FrameNotFound"
+  args: -> [@frameName]
+
 class Poltergeist.ClickFailed extends Poltergeist.Error
   constructor: (@selector, @position) ->
   name: "Poltergeist.ClickFailed"

lib/capybara/poltergeist/driver.rb

@@ -132,7 +132,6 @@ module Capybara::Poltergeist
     end
 
     def within_frame(name, &block)
-      raise NotImplementedError
       browser.within_frame(name, &block)
     end
 

lib/capybara/poltergeist/errors.rb

@@ -54,6 +54,16 @@ module Capybara
       end
     end
 
+    class FrameNotFound < ClientError
+      def name
+        response['args'].first
+      end
+
+      def message
+        "The frame '#{name}' was not found."
+      end
+    end
+
     class NodeError < ClientError
       attr_reader :node
 

spec/integration/session_spec.rb

@@ -410,6 +410,14 @@ describe Capybara::Session do
           log.text.should == "one"
         end
       end
+
+      it "doesn't wait forever for the frame to load" do
+        @session.visit '/'
+
+        expect {
+          @session.within_frame('omg') { }
+        }.to raise_error(Capybara::Poltergeist::FrameNotFound)
+      end
     end
 
     # see https://github.com/jonleighton/poltergeist/issues/115