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  • installing simplejson on the google appengine

    - by user266564
    Super nub question time! I am trying to use simplejson on the google appengine. In a terminal on my machine I have simplejson installed and working. But my when I try to import it in a script running on the appengine I get an error saying no such library exists. If open the interactive console on my machine (from the link on http://localhost:8080/_ah/admin) and type "import simplejson" I get: Traceback (most recent call last): File "/home/chris/google_appengine/google/appengine/ext/admin/init.py", line 210, in post exec(compiled_code, globals()) File "", line 1, in ImportError: No module named simplejson Any thoughts?

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  • [Gdata] GetAuthSubToken returns None

    - by Matt
    Hey guys, I am a little lost on how to get the auth token. Here is the code I am using on the return from authorizing my app: client = gdata.service.GDataService() gdata.alt.appengine.run_on_appengine(client) sessionToken = gdata.auth.extract_auth_sub_token_from_url(self.request.uri) client.UpgradeToSessionToken(sessionToken) logging.info(client.GetAuthSubToken()) what gets logged is "None" so that does seem right :-( if I use this: temp = client.upgrade_to_session_token(sessionToken) logging.info(dump(temp)) I get this: {'scopes': ['http://www.google.com/calendar/feeds/'], 'auth_header': 'AuthSub token=CNKe7drpFRDzp8uVARjD-s-wAg'} so I can see that I am getting a AuthSub Token and I guess I could just parse that and grab the token but that doesn't seem like the way things should work. If I try to use AuthSubTokenInfo I get this: Traceback (most recent call last): File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/webapp/__init__.py", line 507, in __call__ handler.get(*groups) File "controllers/indexController.py", line 47, in get logging.info(client.AuthSubTokenInfo()) File "/Users/matthusby/Dropbox/appengine/projects/FBCal/gdata/service.py", line 938, in AuthSubTokenInfo token = self.token_store.find_token(scopes[0]) TypeError: 'NoneType' object is unsubscriptable so it looks like my token_store is not getting filled in correctly, is that something I should be doing? Also I am using gdata 2.0.9 Thanks Matt

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  • Best Design for a Facebook clone on GAE Java

    - by charming30
    My current App is written in Python on GAE which can do Contacts management, Genealogy, Social Networking, Photo sharing, Telecom Integration (SMS, iVRS, URL Billing), CRON and performs business logic operations for our Mobile Apps. Current Architecture indlues python, django, jquery, memcache and few telecom APIs. Now, It feels that an SOA Architecture on GAE using Java would be really ideal and scalable for this kind of App where we want to build new features like widgets that users can turn on or off and third party developers can also develop and deploy features. Please correct me or improve the following design decision: UI (Current plan is GWT) Sessions, Security and ACL (Spring MVC 2.x) Reusable Business Logic components (?) Implementation of Web Services (?) Your advice would really help.

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  • Efficiently storing a list of prime numbers

    - by eSKay
    This article says: Every prime number can be expressed as 30k±1, 30k±7, 30k±11, or 30k±13 for some k. That means we can use eight bits per thirty numbers to store all the primes; a million primes can be compressed to 33,334 bytes "That means we can use eight bits per thirty numbers to store all the primes" This "eight bits per thirty numbers" would be for k, correct? But each k value will not necessarily take-up just one bit. Shouldn't it be eight k values instead? "a million primes can be compressed to 33,334 bytes" I am not sure how this is true. We need to indicate two things: VALUE of k (can be arbitrarily large) STATE from one of the eight states (-13,-11,-7,-1,1,7,11,13) I am not following how 33,334 bytes was arrived at, but I can say one thing: as the prime numbers become larger and larger in value, we will need more space to store the value of k. How, then can we fix it at 33,334 bytes?

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  • Images in database vs file system

    - by Jesse
    We have a project coming up where we will be building a whole backend CMS system that will power our entire extranet and intranet with one package. The question I have been trying to find an answer to is which is better: storing images in the database (SQL Server 2005) so we may have integrity, single replication plan, etc OR storing on the file system? One issue we have is that we have multiple servers load balanced that require to have the same data at all times. As of now we have SQL replication taking care of that but file replication seems to be a little tougher. Another concern we have is that we would like to have multiple resolutions of the same image, we are not sure if creating and storing each version on the file system would be best or maybe dynamically pulling and creating the resolution image we would like upon request. Our concerns are the with the following: Data integrity Data replication Multiple resolutions Speed of database vs file system Overhead load of database vs file system Data management and backup Does anyone have a similar situation or have any input on what would be recommended? Thanks in advance for the help!

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  • dynamic array pointer to binary file

    - by Yijinsei
    Hi guys, Know this might be rather basic, but I been trying to figure out how to one after create a dynamic array such as double* data = new double[size]; be used as a source of data to be kept in to a binary file such as ofstream fs("data.bin",ios:binary"); fs.write(reinterpret_cast<const char *> (data),size*sizeof(double)); When I finish writing, I attempt to read the file through double* data = new double[size]; ifstream fs("data.bin",ios:binary"); fs.read(reinterpret_cast<char*> (data),size*sizeof(double)); However I seem to encounter a run time error when reading the data. Do you guys have any advice how i should attempt to write a dynamic array using pointers passed from other methods to be stored in binary files?

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  • 2D World design question

    - by Maciek
    I'm facing a problem which is probably extremely common in game-design. Let's assume that we've got a 2D world The world's size is M x N rect The world may contain some items in it The items have (x,y) coords The world can be browsed via a window that is physically (m x n) large. The browser window can be zoomed in / out The browser window can be panned up/down + left right, while in the extents of the world's rect. How should I go about implementing this? I'm especially concerned about the browser window. Can anyone recommend any good reads ? This is not a homework - it's more of a task which I've set myself to complete.

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  • Implications of not forwarding http:// to http://www.

    - by Michael Wilson
    Hi, my company is running IIS and DNN (I'm not a server guy, so color me ignorant), and I've read previous that you should either redirect your .http://www.mydomain to .http://mydomain or Vice Versa. Can anyone give me reasons to do this? (periods "prepended" to remove href) From what I understand, it's because search engines see those as two different 'sites' (Even when visiting one or the other, I can be logged into one but not the other). I also heard it can be a duplicate content problem, which search engines dislike. Just looking for some professional insight, will help me and others. Thanks!

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  • Generate fixed length hash in python for url parameter

    - by LeRoy
    I am working in python on appengine. I am trying to create what is equivalent to the "v" value in the youtube url's (http://www.youtube.com/watch?v=XhMN0wlITLk) for retrieving specific entities. The datastore auto generates a key but it is way too long (34 digits). I have experimented with hashlib to build my own, but again I get a long string. I would like to keep it to under 11 digits (I am not dealing with a huge number of entities) and letters and numbers are acceptable. It seems like there should be a pretty standard solution. I am probably just missing it.

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  • Is there a way to disable calls to Runtime.checkRestricted on the GAE Java development server under Eclipse?

    - by Thomas Becker
    I'm one of those guys who step through their code a lot during development. Beginning with version 1.6.4 of the GAE Java development server, the server has been instrumented with calls to a function named Runtime.checkRestricted. This causes two inconveniences when I step through my code: 1) Whenever I step into a function, the debugger goes into the function Runtime.checkRestricted (for which there is no source code) at least once, often multiple times. 2) Whenever I step over a function call which has a large call tree underneath it, then it takes a very long time for the debugger to come back. (That's always a problem in the Eclipse Java debugger, but now it's really bad.) For me, all this causes a serious drain on productivity. Is there any way to disable this instrumentation, or to prevent the debugger from stepping into it? I am using Eclipse with the GAE plugin.

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  • Thread Local Memory, Using std::string's internal buffer for c-style Scratch Memory.

    - by Hassan Syed
    I am using Protocol Buffers and OpensSSL to generate, HMACs and then CBC encrypt the two fields to obfuscate the session cookies -- similar Kerberos tokens. Protocol Buffers' API communicates with std::strings and has a buffer caching mechanism; I exploit the caching mechanism, for successive calls in the the same thread, by placing it in thread local memory; additionally the OpenSSL HMAC and EVP CTX's are also placed in the same thread local memory structure ( see this question for some detail on why I use thread local memory and the massive amount of speedup it enables even with a single thread). The generation and deserialization, "my algorithms", of these cookie strings uses intermediary void *s and std::strings and since Protocol Buffers has an internal memory retention mechanism I want these characteristics for "my algorithms". So how do I implement a common scratch memory ? I don't know much about the rdbuf(streambuf - strinbuf ??) of the std::string object. I would presumeably need to grow it to the lowest common size ever encountered during the execution of "my algorithms". Thoughts ? My question I guess would be: " is the internal buffer of a string re-usable, and if so, how ?" Edit: See comments to Vlad's answer please.

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  • how to import the parent model on gae-python

    - by zjm1126
    main:. +-a ¦ +-__init__.py ¦ +-aa.py +-b ¦ +-__init__.py ¦ +-bb.py +-cc.py if i am in aa.py , how to import cc.py ? this is my code ,but it is error : from main import cc what should i do . thanks updated in normal python file (not on gae),i can use this code : import os,sys dirname=os.path.dirname path=os.path.join(dirname(dirname(__file__))) sys.path.insert(0,path) import cc print cc.c but on gae , it show error : ImportError: No module named cc

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  • python appengine form-posted utf8 file issue

    - by khany
    hi, i am trying to form-post a sql file that consists on many INSERTS, eg. INSERT INTO `TABLE` VALUES ('abcdé', 2759); then i use re.search to parse it and extract the fields to put into my own datastore. The problem is that, although the file contains accented characters (see the e is a é), once uploaded it loses it and either errors or stores a bytestring representation of it. Heres what i am currently using (and I have tried loads of alternatives): form = cgi.FieldStorage() uFile = form['sql'] uSql = uFile.file.read() lineX = uSql.split("\n") # to get each line and so on. has anyone got a robust way of making this work? remember i am on appengine so access to some libraries is restricted/forbidden

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  • Session expiry times?

    - by user246114
    Hi, I've enabled sessions on my app: // appengine-web.xml <sessions-enabled>true</sessions-enabled> they seem to work when I load different pages under my domain. If I close the browser however, looks like the session is terminated. Restarting the browser shows the last session is no longer available. That could be fine, just wondering if this is documented anywhere, so I can rely on this fact? I tried the following just to test if we can tweak it: // in web.xml <session-config> <session-timeout>10</session-timeout> </session-config> also // in my servlet getThreadLocalRequest().getSession().setMaxInactiveInterval(60 * 5); but same behavior, session data is no longer available after browser restart. I looked at the stats for my project and I see data being used for something like "_ah_SESSION" objects. Are those the sessions from above? If so, shouldn't they be cleaned since they're no longer valid? (Hopefully gae takes care of that automatically?) Thanks

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  • Loading Files in AppEngine

    - by Chris M
    I've got a tiny bit of code to display a file in app.yaml - url: /(.*\.(gif|png|jpg)) static_files: static/\1 upload: static/(.*\.(gif|png|jpg)) in main.py ... class ShowImage(webapp.RequestHandler): def get(self): rootpath = os.path.dirname(__file__) file = rootpath + "/static/tracker.gif"; fh=open(file, 'r') self.response.out.write(fh.read()) fh.close ... I can see the files gone up by going to my *.appspot.com/tracker.gif (as per the app.yaml) But using *.appspot.com/showimage returns Traceback (most recent call last): File "/base/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 510, in __call__ handler.get(*groups) File "/base/data/home/apps/APPNAME/2.341131266814384624/main.py", line 170, in get fh=open(file, 'r') IOError: [Errno 2] No such file or directory: '/base/data/home/apps/APPNAME/2.341131266814384624/static/tracker.gif'

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  • Having difficulty in mapreduce to understand

    - by mahesh
    Hi all, I have seen the below link which is of getting started mapreduce with python http://code.google.com/p/appengine-mapreduce/wiki/GettingStartedInPython But still I am not able to understand how its working. I am executing below code but not able to understand what exactly is happening? mapreduce.yaml mapreduce: - name: Testmapper mapper: input_reader: mapreduce.input_readers.DatastoreInputReader handler: main.process params: - name: entity_kind default: main.userDetail mapreduce/main.py #some code class userDetail(db.Model): name = db.StringProperty() #some code def process(u): u.name="mahesh" yield op.db.Put(u) I am executing this and it gives me status = success in status page. But not able to understand what happend The main thing I want do with mapreduce is to search or count records from entity So anyone can please help me?? Thanks in advance

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  • To Create a Search, with values from multiple selection element?

    - by Harish
    I am working in PHP(with Symfony Framework) and i want to create a search based on multiple values selected from multiple selection element, i.e there will be multiple selection dropdown elements for like countries, cities, age etc.. and the values from them will query a data table and give the desired search output. (all values are not mandatory, will work with atleast one value). the idea will also do..

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  • Appengine not liking my .jspx files

    - by Hans Westerbeek
    I have a little app that runs fine on local dev appengine, but appengine itself is not processing my .jspx files. The jspx files are in WEB-INF so they should not be excluded by appengine (as a static resource) I am using Apache Tiles to define my views. So the html produced looks like this: <html xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:c="http://java.sun.com/jsp/jstl/core" xmlns:tiles="http://tiles.apache.org/tags-tiles" > <jsp:output omit-xml-declaration="yes"/> <jsp:directive.page contentType="text/html;charset=UTF-8" /> <jsp:directive.page isELIgnored="false"/> (etc etc) How can I solve this problem?

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  • Do Blob properties on entities affect query performance?

    - by Jaroslav Záruba
    Hello I'm trying to make my mind on whether to store a binary representation of an entity as its Blob property, or whether I better keep the blobs in some separate 'wrapping' class. Possible impact on memory heap and/or a query execution time are my concerns in the first case, complexity votes against the other one. I know Blobs are not indexed, i.e. index size is not what I'm worrying about. Also I assume for blobs Datastore puts defaultFetchGroup to false, but does it mean that blobs don't make a difference in queries? Regards J. Záruba

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  • Help with game development. Render loop?

    - by John
    Hello, I'm working on a simple game, this is my first game project. Most of the samples I find have a Render Loop where all the game logic is made too and I just don't like this. Let's say I have a ball with X=0, and a wall in X=10 and in a slow machine, the first loop places the ball in X=7 and in a second loop, it places the ball in X=14. It would just crash the game! Is this "render loop" the right way to make games? Should I write code to check for things like this in every frame? Example, new frame X=14, last frame have X=7, so I should check if there's anything from X=7 to X=14?? I was thinking that I should have a separated thread for the game logic and in the render loop, I should just "take a snapshot" of the current game logic and display that, no? How do you guys, experienced game developers work around this? thanks!

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  • GWT with JDO problem

    - by Maksim
    I just start playing with GWT I'm having a really hard time to make GWT + JAVA + JDO + Google AppEngine working with DataStore. I was trying to follow different tutorial but had no luck. For example I wend to these tutorials: TUT1 TUT2 I was not able to figure out how and what i need to do in order to make this work. Please look at my simple code and tell me what do i need to do so i can persist it to the datastore: 1. ADDRESS ENTITY package com.example.rpccalls.client; import java.io.Serializable; import javax.jdo.annotations.IdGeneratorStrategy; import javax.jdo.annotations.Persistent; import javax.jdo.annotations.PrimaryKey; public class Address implements Serializable{ @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private int addressID; @Persistent private String address1; @Persistent private String address2; @Persistent private String city; @Persistent private String state; @Persistent private String zip; public Address(){} public Address(String a1, String a2, String city, String state, String zip){ this.address1 = a1; this.address2 = a2; this.city = city; this.state = state; this.zip = zip; } /* Setters and Getters */ } 2. PERSON ENTITY package com.example.rpccalls.client; import java.io.Serializable; import java.util.ArrayList; import javax.jdo.annotations.IdGeneratorStrategy; import javax.jdo.annotations.PersistenceCapable; import javax.jdo.annotations.Persistent; import javax.jdo.annotations.PrimaryKey; import com.google.appengine.api.datastore.Key; @PersistenceCapable public class Person implements Serializable{ @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Key key; @Persistent private String name; @Persistent private int age; @Persistent private char gender; @Persistent ArrayList<Address> addresses; public Person(){} public Person(String name, int age, char gender){ this.name = name; this.age = age; this.gender = gender; } /* Getters and Setters */ } 3. RPCCalls package com.example.rpccalls.client; import java.util.ArrayList; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.core.client.GWT; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.RootPanel; import com.google.gwt.user.client.ui.TextBox; public class RPCCalls implements EntryPoint { private static final String SERVER_ERROR = "An error occurred while attempting to contact the server. Please check your network connection and try again."; private final RPCCallsServiceAsync rpccallService = GWT.create(RPCCallsService.class); TextBox nameTxt = new TextBox(); Button btnSave = getBtnSave(); public void onModuleLoad() { RootPanel.get("inputName").add(nameTxt); RootPanel.get("btnSave").add(btnSave); } private Button getBtnSave(){ Button btnSave = new Button("SAVE"); btnSave.addClickHandler( new ClickHandler(){ public void onClick(ClickEvent event){ saveData2DB(nameTxt.getText()); } } ); return btnSave; } void saveData2DB(String name){ AsyncCallback<String> callback = new AsyncCallback<String>() { public void onFailure(Throwable caught) { Window.alert("WOOOHOOO, ERROR: " + SERVER_ERROR);

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