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• Using persistent and non-persistent connection together in a PHP MySQL app

  - by cappuccino

  There are parts of my app where a persistent connection is required, in particular the parts where every hour maybe 30,000 select requests are made by many different users, this is causing my mysql server to max out on the 100 connection limit, and i really don't want to increase it since 100 connections already seems like alot. So for the parts of the application where reading and selecting is the case I want to switch to persistent connections. The other parts where data is being modified is usually done through a transaction, and the general rule is never to use persistent connections for transactions according to the php documentation. So I would like to keep this on non-persistent connections. My question is, am i able to use persistent and non-persistent connections together in the same app, the same script etc? I am using PHP 5.2+, MySQL 5+ (InnoDB tables) and the Zend Framework 10.6+

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• App Engine webapp.RequestHandler child instances has no self.request during __init__

  - by grucha

  i use modified webapp.RequestHandler for handling requests in my app: class MyRequestHandler(webapp.RequestHandler): """ Request handler with some facilities like user. self.out is the dictionary to pass to templates """ def __init__(self, *args, **kwargs): super(MyRequestHandler, self).__init__(*args, **kwargs) self.out = { 'user': users.get_current_user(), 'logout_url': users.create_logout_url(self.request.uri) } def render(self, template_name): """ Shortcut to render templates """ self.response.out.write(template.render(template_name, self.out)) class DeviceList(MyRequestHandler): def get(self): self.out['devices'] = GPSDevice.all().fetch(1000) self.render('templates/device_list.html') but I get an exception: line 28, in __init__ self.out['logout_url'] = users.create_logout_url(self.request.uri) AttributeError: 'DeviceList' object has no attribute 'request' When the code causing exception is moved out of __init__ everything's fine: class MyRequestHandler(webapp.RequestHandler): """ Request handler with some facilities like user. self.out is the dictionary to pass to templates and initially it contains user object for example """ def __init__(self, *args, **kwargs): super(MyRequestHandler, self).__init__(*args, **kwargs) self.out = { 'user': users.get_current_user(), } def render(self, template_name): """ Shortcut to render templates """ self.out['logout_url'] = users.create_logout_url(self.request.uri) self.response.out.write(template.render(template_name, self.out)) Whi is that? Why there's no self.request after parent's (i.e. webapp.RequestHandler's) __init__ was executed?

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• In Google App Engine, what is the simplest way to keep a record of items that you have put into memc

  - by Chris Boesch

  I am starting to use memcache more frequently to avoid having to recalculate things between page requests. When the memcache periodically clears, as it is designed to do, I have to start all over rebuilding various items that I have placed in memcache. What I would like to do is create a very simple model that enables me to periodically save the items that I put into memcache based on the memcache keys that I'm using along with a datetime that is related to the data being memcached. What is the best way to do this? I'm looking for something like this: class MemcacheRecord(db.Model): key = db.StringProperty(required=True) value = #Something that can store whatever memcache can validThru = db.DateTimeProperty(required=True) def set(self, key, value, validThru): #Save a new memcache record newMemcacheRecord = MemcacheRecord(key=key, value=value, validThru=validThru) .. return True # or False def get_latest(self, key): #Get the memcache record with the most recent validThru datetime latestMemcacheRecord = MemcacheRecord.all().order('-validThru').get() return {'validThru':latestMemcacheRecord.validThru, 'value':latestMemcachRecord.value}

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• what POIs (Point of Interests) DB can I use for a commercial app

  - by Ellie

  Hi, I need a POI database for a startup project I am working on - it will be a free basic version and a premium paid for version in the sense that user will pay a monthly subscription. I would like to use foursquare type checkin to places and plancast type functionality to search for places (one-line search). Ie I need to: - perform a search for POIs around a location - associate users to that POI, with a time stamp - allow users to add own POIs - provide free-text search for POIs (a la google one-line search) Google API allows great search, but I understand there are limits in number of requests that can be done? This would prevent scaling, and may result in application breaking when too many users. Also what does google T&C say about using this in a paid for service? Openstreetmap I understand does not have these contstraints, but do they also provide a good one-line search type API? Or how could I solve this? Many thanks for any advice, Ellie

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• Load a MySQL innodb database into memory

  - by jack

  I have a MySQL innodb database at 1.9GB, showed by following command. SELECT table_schema "Data Base Name", -> sum( data_length + index_length ) / 1024 / -> 1024 "Data Base Size in MB", -> sum( data_free )/ 1024 / 1024 "Free Space in MB" -> FROM information_schema.TABLES -> GROUP BY table_schema ; +--------------------+----------------------+------------------+ | Data Base Name | Data Base Size in MB | Free Space in MB | +--------------------+----------------------+------------------+ | database_name | 1959.73437500 | 31080.00000000 | My questions are: Does it mean if I set the innodb_buffer_pool_size to 2GB or larger, the whole database can be loaded into memory so much fewer read from disk requests are needed? What does the free space of 31GB mean? If the maximum RAM can be allocated to innodb_buffer_pool_size is 1GB, is it possible to specify which tables to loaded into memory while keep others always read from disk? Thanks in advance.

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• Browser for cross-site-script testing (for testing Mozilla Add-On)

  - by Anthony

  I am working on a Firefox extension that will involve ajax calls to domains that would normally fail due to the same-origin policy set by Firefox (and most modern browsers). I was wondering if there is a way to either turn off the same-origin restriction (in about:config, perhaps) or if there was a standard lite-browser that developers turn to for this. I really would like to avoid using any blackhat tools, if possible. Not because I'm against them, I just don't want to add another learning curve to the process. I can use curl in PHP to confirm that the requests work, but I want to get started on writing the js that the addon will actually use, so I need a client that will execute js. I also tried spidermonkey, but since I'm doing the ajax with jquery, it threw a fit at all of the browser-based default variables. So, short version: is there a reliable browser/client for cross site scripting that isn't primarily a hacker app? Or can I just turn off same-domain policy in Firefox?

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• Java: Parse Australian Street Addresses

  - by bguiz

  Looking for a quick and dirty way to parse Australian street addresses into its parts: 3A/45 Jindabyne Rd, Oakleigh, VIC 3166 should split into: "3A", 45, "Jindabyne Rd" "Oakleigh", "VIC", 3166 Suburb names can have multiple words, as can street names. See: http://stackoverflow.com/questions/1739746/parse-a-steet-address-into-components Has to be in Java, cannot make http requests (e.g. to web APIs). EDIT: Assume that format specified is always followed. I have no issue with spitting incorrectly formatted strings back at the user with a message telling them to follow the format (which I've described above).

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• Combine static files or load in parallel

  - by Niall Collins

  I am at present introducing code to my site to combine css and javascript files. Is there a way without having to include an external library to load javascript asynchronously or in parallel? I have read on some blogs that combining of files can be counter productive as the load of the http request can be large and its better to load multiple files in parallel. Opinions on this? I am caching my javascript/css. And would have thought it was better to combine rather than have multiple http requests.

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• Dynamically loading CSS and JavaScript using Prototype

  - by Salman A

  I have a classic ASP application that I've been constantly trying to modularize. Currently, almost all pages are divided in to two pages: an outer page that contains the layout, header, sidebar, footer an inner page that contains ASP code The outer pages use dreamweaver templates so updating layout and replicating changes is easy. The inner pages are managed by me. Now here is the problem: I had to add a lightbox to one page, I chose Lightbox 2 which requires Prototype. I ended up adding Prototype on every page, assuming that sooner or later I'll upgrade all pages, forms, ajax requests and other javascript to use Prototype. I've now added two other plugins -- Modalbox and Protofade; each with a pair of .JS and .CSS files. Since I'll be using these three plugins on specific set of pages I am wondering if I can load the required CSS and JS files dynamically. I do not want to access the document head and add include files there, I'll have to do this from inside a DIV where all ASP code is supposed to go.

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• Creating client-side dynamic dependent controls , interactive user interface

  - by igor

  Hello everyone! I am looking for client-side javascript plugin for jquery(prefered, or maybe other framework) or other javascript framework, that implements dynamic, interactive user interface (fig. 1) Requirements: 1) user interface shall be dynamic (client-side, javascript). 2) the displaying of the next control shall be dependent on input of previous control(s) 3) the dependency shall be implemented in declarative form (settings, mapping, xml...) 4) this scope of controls shall be supported: dropdown list - fixed list (static, list of items has fixed scope of items) edit input (loop-up) - dynamic list, dependent on user input dropdown list - fixed list (dynamic, list of items dependent on previous input) static structure controls to display dynamic data. 5) this scope of dependencies shall be implemented: one-way: one to one one-way: one to many 6) this scope of dependency actions shall be implemented: hide (remove) control show (add) control show disabled set default value 7) controls shall be filled in by using ajax requests to the server-side application (json, xml...) Any thoughts, references, I would appreciate any assistance. Fig. 1. Interactive user interface

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• Improving the speed of php

  - by cast01

  I'm currently working on a website in PHP, and I'm wondering what the best practices/methods are to reduce the time requests take. I've build the site in a modular way, so a page would consist of a number of modules, and each of these would need to request information. For example, I have a cart module, that (if a cart is set) will fetch the cart with the id (stored in a session variable) from the database and return its contents. I have another module that lists categories and this needs to fetch the categories from the database. My system is built with models, and each model might also make a request, for example a category model will make a request to get products in that category.

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• How to prevent traffic to/from a slow Cassandra node using Python

  - by Sergio Ayestarán

  Intro: I have a Python application using a Cassandra 1.2.4 cluster with a replication factor of 3, all reads and writes are done with a consistency level of 2. To access the cluster I use the CQL library. The Cassandra cluster is running on rackspace's virtual servers. The problem: From time to time one of the nodes can become slower than usual, in this case I want to be able to detect this situation and prevent making requests to the slow node and if possible to stop using it at all (this should theoretically be possible since the RF is 3 and the CL is 2 for every single request). The questions: What's the best way of detecting the slow node from a Python application? Is there a way to stop using one of the Cassandra nodes from Python in this scenario without human intervention? Thanks in advance!

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• Need help using the Windows IP Helper API & ParseNetworString in C#.

  - by JohnnyNoir

  I'm attempting to rewrite some C# web service code that uses the Windows IP Helper API call "SendARP" to retreive a remote system's MAC address. SendARP works great - until you cross a network segment as Arp requests aren't routed. I've been looking at the "ParseNetworkString" documentation after happening across its existance on StackOverflow. The quick & dirty algorithm I have in mind is: public static string GetMacAddress(string strHostOrIP) { if (strHostOrIP is IPAddress) { parse results of nbstat -A strHostOrIP return macAddress } if (strHostOrIP is Hostname) { IPHostEntry hostEntry = null; try { hostEntry = Dns.GetHostEntry(strHostOrIP); } catch { return null; } if (hostEntry.AddressList.Length == 0) { return null; } foreach (IPAddress ip in hostEntry.AddressList) { if (ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork) { ipAddress = ip; break; } } } return GetMACAddress(ipAddress); } "ParseNetworkString" is new with Vista/Win2008 so I haven't been able to find example C# code demonstrating its use and I'm no C++ coder so if anyone can point me in the right direction...

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• Is it possible to use JSONP on the server?

  - by Denis Hoctor

  Hi all, I'm stuck on a clients host that has medium trust setup which blocks cross domain requests and need data from a 3rd party domain. I now have the option to use JSONP. I've used JSONP from the client with jQuery to get around the browsers cross domain security and I've used HttpWebRequest in ASP.Net 3.5. Is it possible to use JSON on the server and if so how? I don't think it is, but worth asking seeing as I already have this app written server side.... Thanks, Denis

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• J2ME HTTPS Connection Problem: Certificate was issued by an unrecognized entity

  - by Mustafa

  I am developing a little J2ME application that will read our grades from our university's server. With Desktop Applications, It is fine, I can do it but in J2ME, it always gives me this error, even I use well-known services like HTTPS Google, I still get the same error. urlConn = (HttpsConnection) Connector.open("https://stars.bilkent.edu.tr/srs/ajax/login.php"); urlConn.setRequestMethod(HttpsConnection.POST); urlConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); o = urlConn.openOutputStream(); // Sending my POST requests to server input = urlConn.openDataInputStream(); In the last line I always get the error I mentioned above. What should I do about it?

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• How to use a DHT for a social trading environment

  - by Lirik

  I'm trying to understand if a DHT can be used to solve a problem I'm working on: I have a trading environment where professional option traders can get an increase in their risk limit by requesting that fellow traders lend them some of their risk limit. The lending trader will can either search for traders with certain risk parameters which are part of every trader's profile, i.e. Greeks, or the lending trader can subscribe to requests from certain traders. I want this environment to be scalable and decentralized, but I don't know how traders can search for specific profile parameters when the data is contained in a DHT. Could anybody explain how this can be done?

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• Explanation for expires header

  - by sushil bharwani

  I have a joomla application working on Apache.To improve site performace we have written a .htaccess file to root of the application with setting a far future expires header to all the static content. As desired first time the files load in fresh with 200 status code. when again click on the same link many of the files are served directly from cache. I need explanation for two things When i press f5 then a number of files load with 304 status code however i expected them to be coming directly from cache without hitting the server for a status header? When i close the browser and come back to the same page again i see the same thing happening a number of files load with 304 status code although i thought they will load directly from the browser cache? I understand that 304 also servs file from browser cache but i want to avoid the header communication between servers as my static files wont ever change. Also i want to add that my requests are over a https connection does that create any issue.

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• After dynamically changing a form submit function causes old function to get called once then new fu

  - by cnobile

  I am setting the submit function on a form with jQuery then later in the process I reset the function to something else. What happens is the original function gets called again then the new function when only the new function should have been called. I am sending the requests with AJAX. The first one validated the values on the server then asks if you want to continue. Clicking the submit again should only call the changed function but for some reason both get called simultaneously with a single click. What is happening here? Could jQuery be delaying the the setting of the 2nd function on the form submit?

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• ASP.Net Cross Page Posting

  - by John

  Currently I have two pages: The first page contains an input form, and the 2nd page generates an excel document. The input form's button posts to this 2nd page. What I'd like to do is add a second button which also posts to the 2nd page; however, I'll need requests created from this new button to act differently, which brings me to my question: Is there a way I can tell, from the 2nd page, which button was pressed to submit the request? The main reason I'm asking is I'd like to re-use the 2nd page's logic in parsing the information from the first page if possible; I'd rather not have to copy it to a new page and have the new button post to that. Thanks!

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• set current user in asp.net mvc

  - by Tomh

  Hey guys, I'm not sure if this is the best way to do it, but I want to keep a user object alive during all requests of the current user. From reading several resources I learned that you should create your own IPrinciple which holds this. But I don't want to trigger the database every authentication request. Any recommendations on how to handle this? Is caching the db request a good idea? protected void Application_AuthenticateRequest(Object sender, EventArgs e) { HttpCookie authCookie = Request.Cookies[FormsAuthentication.FormsCookieName]; if (authCookie != null) { FormsAuthenticationTicket authTicket = FormsAuthentication.Decrypt(authCookie.Value); User user; using (HgDataContext hg = new HgDataContext()) { if (Session["user"] != null) { user = (from u in hg.Users where u.EmailAddress == authTicket.Name select u).Single(); } else { user = Session["user"] as User; } } var principal = new HgPrincipal(user); Context.User = principal; } }

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• Mono and Apache are serving files with no ASP.NET processing

  - by dnord

  On a new Rackspace Cloud Server box (Ubuntu 9.10), I've installed apache2, libapache2-mod-mono, and mod-mono-server2. I've disabled mod_mono and enabled mod_mono_auto, but whatever I do, requests for Default.aspx return the actual contents of Default.aspx (in this case, "This is a marker file generated by the precompilation tool, and should not be deleted!") I've installed XSP, and it looks like it works okay, but I'd like to use Apache with mod_mono (seems a more common configuration) if I can get it running. However, this is no error messages and no hints, with Google obviously not terribly helpful. What else can I look for to make sure I'm configured correctly? How can I test further?

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• Response.Redirect() will not redirect on Internet Explorer

  - by Amit

  Hi, I am using Response.Redirect("someurl",true); in the page_preInit event to redirect all the requests that come to a page. It works fine on Firexox, but if i access the page from internet explorer 7/8, it says page can not be found and will not redirect to new URL. Any idea why this happens?? Update: I tried giving a radom URL in the redirect such as google.com and it works fine. Actually the URL I am trying to redirect is not accessible on my machine, it is on another VPN. I guess IE will not change the URL on the addressbar if it can not access the URL. Firefox on the other hand changes the address on the address bar.

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• JSON to Persistent Data Store (CoreData, etc.)

  - by Bryan Veloso

  All of the data on my application is pulled through an API via JSON. The nature of a good percentage of this data is that it doesn't change very often. So to go and make JSON requests to get a list of data that doesn't change much didn't seem all that appealing. I'm looking for the most sensible option to have this JSON saved onto the iPhone in some sort of persistent data store. Obviously one plus of persisting the data would be to provide it when the phone can't access the API. I've looked at a few examples of having JSON and CoreData interact, for example, but it seems that they only describe transforming NSManagedObjects into JSON. If I can transform JSON into CoreData, my only problem would be being able to change that data when the data from the API does change. (Or, maybe this is all just silly.)

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• Set top level directory to be handled by Perl?

  - by Sam Lee

  I have an Apache server set up to use mod_perl. I have it set up to handle all requests using a Perl module MyModule. Here is part of my httpd.conf: LoadModule perl_module modules/mod_perl.so <Directory /> Order Deny,Allow Allow from all </Directory> PerlModule MyModule <Location /> SetHandler modperl PerlResponseHandler MyModule </Location> This seems to work fine, except top level directory (ie. www.mysite.com/) is not being sent to MyModule. What's going wrong?

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• Will an Nginx as reverse proxy for Apache help on dynamic content only

  - by Saif Bechan

  I am planning to move all my static content to a CDN so on my server I only have dynamic content left. I now have Nginx set up as reverse proxy to Apache. The static request that came in where directly delivered by Nginx without having to go to Apache. In this case Nginx handled a large portion of the request and I can clearly see the necessity of Nginx. Now that I moved all the static content to another domain, is there still a need to have nginx in front of Apache. Because now all the request are by default dynamic requests and all go to Apache. Are there any other benefits of having Nginx and Apache running for only dynamic content. My dynamic content is PHP/MySQL Edit: To be clear: I now have Nginx as a reverse proxy. It delivers static and dynamic content. But I am moving my static files to a CDN. Do I then still need Nginx on my domain.

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