Stop PhantomJS if a site unavailable

Author: mgrachev

lib/gastly/screenshot.rb

@@ -5,6 +5,8 @@
 module Gastly
   class Screenshot
 
+    FetchError = Class.new(StandardError)
+
     SCRIPT_PATH = File.expand_path('../script.js', __FILE__)
     DEFAULT_TIMEOUT = 0
     DEFAULT_BROWSER_WIDTH = 1440
@@ -53,7 +55,9 @@ def capture
 
       Phantomjs.proxy_host = proxy_host if proxy_host
       Phantomjs.proxy_port = proxy_port if proxy_port
-      Phantomjs.run(proxy_options, SCRIPT_PATH.to_s, *prepared_params)
+      output = Phantomjs.run(proxy_options, SCRIPT_PATH.to_s, *prepared_params)
+
+      raise FetchError, output if output.present?
 
       Gastly::Image.new(tempfile)
     end

lib/gastly/script.js

@@ -39,24 +39,29 @@ if (args.cookies !== undefined){
     }
 }
 
-page.open(args.url, function(){
-    window.setTimeout(function(){
-        page.viewportSize = { width: args.width, height: args.height };
-
-        if (args.selector !== undefined){
-            var clipRect = page.evaluate(function(s){
-                return document.querySelector(s).getBoundingClientRect();
-            }, args.selector);
-
-            page.clipRect = {
-                top:    clipRect.top,
-                left:   clipRect.left,
-                width:  clipRect.width,
-                height: clipRect.height
-            };
-        }
-
-        page.render(args.output);
+page.open(args.url, function(status){
+    if(status !== 'success') {
+        console.log('Unable to load: ' + args.url);
         phantom.exit();
-    }, args.timeout);
+    } else {
+        window.setTimeout(function(){
+            page.viewportSize = { width: args.width, height: args.height };
+
+            if (args.selector !== undefined){
+                var clipRect = page.evaluate(function(s){
+                    return document.querySelector(s).getBoundingClientRect();
+                }, args.selector);
+
+                page.clipRect = {
+                    top:    clipRect.top,
+                    left:   clipRect.left,
+                    width:  clipRect.width,
+                    height: clipRect.height
+                };
+            }
+
+            page.render(args.output);
+            phantom.exit();
+        }, args.timeout);
+    }
 });

lib/gastly/version.rb

@@ -1,3 +1,3 @@
 module Gastly
-  VERSION = '0.2.0'
+  VERSION = '0.2.1'
 end