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How do you build a Request-Response service using Asyncore in Python?

- by Casey

I have a 3rd-party protocol module (SNMP) that is built on top of asyncore. The asyncore interface is used to process response messages. What is the proper technique to design a client that generate the request-side of the protocol, while the asyncore main loop is running. I can think of two options right now: Use the loop,timeout parameters of asyncore.loop() to allow my client program time to send the appropriate request. Create a client asyncore dispatcher that will be executed in the same asyncore processing loop as the receiver. What is the best option? I'm working on the 2nd solution, cause the protocol API does not give me direct access to the asyncore parameters. Please correct me if I've misunderstood the proper technique for utilizing asyncore.

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Git push won't do anything (Everything up-to-date)

- by phleet

I'm trying to update a git repository on github. I made a bunch of changes, added them, committed then attempted to do a git push. The response tells me that everything is up to date, but clearly it's not. git remote show origin responds with the repository I'd expect. Why is git telling me the repository is up to date when there are local commits that aren't visible on the repository? [searchgraph] git status # On branch develop # Untracked files: # (use "git add <file>..." to include in what will be committed) # # Capfile # config/deploy.rb nothing added to commit but untracked files present (use "git add" to track) [searchgraph] git add . [searchgraph] git status # On branch develop # Changes to be committed: # (use "git reset HEAD <file>..." to unstage) # # new file: Capfile # new file: config/deploy.rb # [searchgraph] git commit -m "Added Capistrano deployment" [develop 12e8af7] Added Capistrano deployment 2 files changed, 26 insertions(+), 0 deletions(-) create mode 100644 Capfile create mode 100644 config/deploy.rb [searchgraph] git push Everything up-to-date [searchgraph] git status # On branch develop nothing to commit (working directory clean)

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Distributed transactions

- by javi

Hello! I've a question regarding distributed transactions. Let's assume I have 3 transaction programs: Transaction A begin a=read(A) b=read(B) c=a+b write(C,c) commit Transaction B begin a=read(A) a=a+1 write(A,a) commit Transaction C begin c=read(C) c=c*2 write(A,c) commit So there are 5 pairs of critical operations: C2-A5, A2-B4, B4-C4, B2-C4, A2-C4. I should ensure integrity and confidentiality, do you have any idea of how to achieve it? Thank you in advance!

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Design Question on when to save

- by Ben

Hi, I was just after peoples opinion on when the best time to save an object (or collection of objects) is. I appreciate that it can be completely dependent on the situation that you are in but here is my situation. I have a collection of objects "MyCollection" in a grid. You can open each object "MyObject" in an editor dialogue by double clicking on the grid. Selecting "Cancel" on the dialogue will back out any changes you have made, but should selecting "ok" commit those changes back to the database, or should they commit the changes on that object back to the collection and have a save method that iterates through the collection and saves all changed objects? If i have an object "MyParentObject", that contains a collection of childen "MyChildObjectCollection", none of the changes made to each "MyChildObject" would be commited to the database until the "MyParentObject" was saved - this makes sense. However in my current situation, none of the objects in the collection are linked, therefore should the "Ok" on the dialogue commit the changes to the database? Appreciate any opinions on this. Thanks

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Error while importing SSL into jboss 4.2 ?

- by worldpython

I've tried to setup .keystore on Jboss 4.2. due to this documentation from jboss community http://community.jboss.org/wiki/sslsetup but Jboss console generate this error LifecycleException: service.getName(): "jboss.web"; Protocol handler start failed: java.io.FileNotFoundException: C:\Documents and Settings\mebada\.keystore (The system cannot find the file specified) even I specify location of keystore in server.xml <Connector className = "org.apache.coyote.tomcat4.CoyoteConnector" address="${jboss.bind.address}" port = "8443" protocol="HTTP/1.1" SSLEnabled="true" scheme = "https" secure = "true"> <Factory className = "org.apache.coyote.tomcat4.CoyoteServerSocketFactory" keystoreFile="D:/Projects/Demo/jboss-4.2.3.GA/jboss-4.2.3.GA/server/default/conf/server.keystore" keystorePass="tc-ssl" protocol = "TLS"></Factory> Any Help ? Thanks in advance

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Proper way to set object instance variables

- by ensnare

I'm writing a class to insert users into a database, and before I get too far in, I just want to make sure that my OO approach is clean: class User(object): def setName(self,name): #Do sanity checks on name self._name = name def setPassword(self,password): #Check password length > 6 characters #Encrypt to md5 self._password = password def commit(self): #Commit to database >>u = User() >>u.setName('Jason Martinez') >>u.setPassword('linebreak') >>u.commit() Is this the right approach? Should I declare class variables up top? Should I use a _ in front of all the class variables to make them private? Thanks for helping out.

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git: How to diff changed files versus previous versions after a pull?

- by doug

I'm new to git, using it via Terminal on Snow Leopard. When I run "git pull" I often want to know what changed between the last version of a file and the new one. Say I want to know what someone else committed to a particular file. How is that done? I'm assuming it's "git diff" with some parameters for commit x versus commit y but I can't seem to get the syntax. I also find "git log" confusing a bit and am not sure where to get the commit ID of my latest version of the file versus the new one.

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How can I graph the Lines of Code history for git repo?

- by dbr

Basically I want to get the number of lines-of-code in the repository after each commit. The only (really crappy) ways I have found is to use git filter-branch to run "wc -l *", and a script that run git reset --hard on each commit, then ran wc -l To make it a bit clearer, when the tool is run, it would output the lines of code of the very first commit, then the second and so on.. This is what I want the tool to output (as an example): me@something:~/$ gitsloc --branch master 10 48 153 450 1734 1542 I've played around with the ruby 'git' library, but the closest I found was using the .lines() method on a diff, which seems like it should give the added lines (but does not.. it returns 0 when you delete lines for example) require 'rubygems' require 'git' total = 0 g = Git.open(working_dir = '/Users/dbr/Desktop/code_projects/tvdb_api') last = nil g.log.each do |cur| diff = g.diff(last, cur) total = total + diff.lines puts total last = cur end

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Implement a vpn

- by jackson

I want to build an application client(client.exe) - server to do the following: when the clients run it they are thrown in a VPN and they can communicate each other within 1 applicataion. For example : clients run client.exe and they can see each other in LAN ONLY in Starcraft. From what i have read the right type of vpn for this situation is Secured Socket Tunneling Protocol: "Secure socket tunneling protocol, also referred to as SSTP, is by definition an application-layer protocol. It is designed to employ a synchronous communication in a back and forth motion between two programs. It allows many application endpoints over one network connection, between peer nodes, thereby enabling efficient usage of the communication resources that are available to that network. " Question: I don't have experience with networking programming so my question for the ones who have, is this the right approach? PS1: i don't want something done like OpenVpn, i do this as learning exercise. PS2: the application is targeting Windows and i plan to use .NET Thanks for reading the whole story, i am waiting for your replies.

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GIT: Checkout to a "Really" Specific Folder

- by Rafid K. Abdullah

I want to export, checkout, or whatever you call it from the index, HEAD, or any other commit, to a specific folder, how is that possible? Similar questions have already been asked: GIT: Checkout to a specific folder How to do a "git export" (like "svn export") But the problem with the proposed solution is that they preserve the relative path. So for example, if I use the mentioned method to check out the file nbapp/editblog.php to the folder temp, the file would be checked out in temp/nbapp/editblog.php! Is there anyway to checkout to 'temp' directly? Also, another important thing is to be able to check the HEAD or any other commit. The checkout-index (which allows using the --prefix option to checkout to a specific folder, while normal checkout doesn't allow) checks out only the index. What if I want to check out a file from a certain commit to a certain folder? A similar question has alread

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How can I do a partial update (i.e., get isolated changesets) from subversion with subclipse?

- by Ingvald

If a file is committed several times with various changes, how can I fetch one change at a time, i.e., one changeset at a time? I use eclipse, subversion, and subclipse, and I can't change the former two for the time being (or the MS platform..). In my list/ overview a file seems to be listed only in the latest relevant changeset even if all changesets are listed. So an earlier changeset doesn't necessarily show the full set of files in the original commit, nor the original diff for a file in a commit. Update: I'm thinking about using changesets for simplified peer review, so I'd like the partial update represented for all the files commited in one changeset. It's easy to get diffs and specific revisions for specific files in eclipse, but I'd like to step through all the changes in one specific commit/ changeset in a practical manner.

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Simple bad merge scenario in mercurial

- by user281180

I have created a repository AAA and another BBB. In AAA I have created a file A with the values a1, a2, a3 and commit In BBB I have created a file B with the values b1, b2, b3, commit and export a bundle. I add the bundle in AAA and merge. I make a change in B, and write b33 in AAA and another change in B and write b23 in BBB. and commit both. I create bundle of BBB and add the bundle in AAA. I do a merge. Now I decide to revert to the revert to step 2. I no more want to have the merge of 4. changes done in B as they were bad merges. Now I want to add the bundle of 3 but I can see that it can`t see any changes anymore. Why? How can I do the merge once more?

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Git subtree workflow

- by Cedric

In my current project I'm using an open source forum (https://github.com/vanillaforums/Garden.git). I was planning on doing something like this : git remote add vanilla_remote https://github.com/vanillaforums/Garden.git git checkout -b vanilla vanilla_remote/master git checkout master git read-tree --prefix=vanilla -u vanilla This way I can make change into the vanilla folder (like changing config) and commit it to my master branch and I can also switch into my vanilla branch to fetch updates. My problem is when I try to merge the branch together git checkout vanilla git pull git checkout master git merge --squash -s subtree --no-commit vanilla The problem is that the "update commit" goes on top of my commits and "overwrite" my change. I would rather like to have my commits replay on top of the update. Is there a simple way to do that? I'm not very good in git so maybe this is the wrong approach. Also, I really don't want to mix my history with the vanilla history.

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How good is my method of embedding version numbers into my application using Mercurial hooks?

- by ArtB

This is not quite a specifc question, and more me like for a criticism of my current approach. I would like to include the program version number in the program I am developing. This is not a commercial product, but a research application so it is important to know which version generated the results. My method works as follows: There is a "pre-commit" hook in my .hg/hgrc file link to .hg/version_gen.sh version_gen.sh consists solely of: hg parent --template "r{rev}_{date|shortdate}" > version.num In the makefile, the line version="%__VERSION__% in the main script is replaced with the content of the version.num file. Are there better ways of doing this? The only real short coming I can see is that if you only commit a specfic file, version.num will be updated, but it won't be commited, and if I tried to add always committing that file, that would result in an infite loop (unless I created some temp file to indicate I was already in a commit, but that seems ugly...).

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.NET Data Providers - How do I determine what they can do?

- by rbellamy

I have code which could be executed using a Provider that doesn't support transactions, or doesn't support nested transactions. How would I programmatically determine such support? E.g. The code below throws a System.InvalidOperationException on the final commit when using the MySQL .NET Connector, but works fine for MSSQL. I'd like to be able to alter the code to accommodate various providers, without having to hardcode tests based on the type of provider (E.g. I don't want to have to do if(typeof(connection) == "some provider name")) using (IDbConnection connection = Use.Connection(ConnectionStringName)) using (IDbTransaction transaction = connection.BeginTransaction()) { using (currentCommand = connection.CreateCommand()) { using (IDbCommand cmd = connection.CreateCommand()) { currentCommand = cmd; currentCommand.Transaction = transaction; currentCommand.ExecuteNonQuery(); } if (PipelineExecuter.HasErrors) { transaction.Rollback(); } else { transaction.Commit(); } } transaction.Commit(); }

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How can I "git log" only code published to trunk?

- by Russell Silva

At my workplace we have a "master" trunk branch that represents published code. To make a change, I check out a working copy, create a topic branch, commit to the topic branch, merge the topic branch into master, and push. For small changes, I might commit directly to master, then push. My problem is that when I use "git log", I don't care about my topic branches in my local working copy. I only want to see the changes to the master branch on the remote, shared git server. What's more, if I use --stat or -p or one of their friends, I want to see the files and changes associated with the merge commit to master, not associated to their original branch commits (which, like I said, I don't want to see at all). How do I go about doing this?

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Unable to create application factory of class org.apache.wicket.spring.SpringWebApplicationFactory

- by theJava

org.apache.wicket.protocol.http.WebApplicationFactoryCreationException: Unable to create application factory of class org.apache.wicket.spring.SpringWebApplicationFactory at org.apache.wicket.protocol.http.WicketFilter.getApplicationFactory(WicketFilter.java:228) at org.apache.wicket.protocol.http.WicketFilter.init(WicketFilter.java:271) at org.apache.wicket.protocol.http.WicketFilter.init(WicketFilter.java:252) at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:713) at org.mortbay.jetty.servlet.Context.startContext(Context.java:140) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499) at org.mortbay.jetty.plugin.Jetty6PluginWebAppContext.doStart(Jetty6PluginWebAppContext.java:115) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.Server.doStart(Server.java:224) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) at org.mortbay.jetty.plugin.Jetty6PluginServer.start(Jetty6PluginServer.java:132) at org.mortbay.jetty.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:454) at org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:396) at org.mortbay.jetty.plugin.AbstractJettyRunMojo.execute(AbstractJettyRunMojo.java:210) at org.mortbay.jetty.plugin.Jetty6RunMojo.execute(Jetty6RunMojo.java:184) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:107) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:195) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:148) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:140) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59) at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:314) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:151) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:445) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:168) at org.apache.maven.cli.MavenCli.main(MavenCli.java:132) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352) 2010-12-28 14:51:46.213:INFO::Started [email protected]:8080 I am using Wicket 1.5 M3, Spring 3.0 and i am getting this error. Below is my Web.xml config. <?xml version="1.0" encoding="ISO-8859-1"?> <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4"> <display-name>mysticpaste</display-name>  <filter> <filter-name>wicket.mysticpaste</filter-name> <filter-class> org.apache.wicket.protocol.http.WicketFilter </filter-class> <init-param> <param-name>applicationFactoryClassName</param-name> <param-value>org.apache.wicket.spring.SpringWebApplicationFactory</param-value> </init-param> </filter> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:com/mysticcoders/mysticpaste/spring/application-context.xml</param-value> </context-param> <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener> <filter> <filter-name>wicket.session</filter-name> <filter-class>org.apache.wicket.protocol.http.servlet.WicketSessionFilter</filter-class> <init-param> <param-name>filterName</param-name> <param-value>wicket.mysticpaste</param-value> </init-param> </filter> <filter-mapping> <filter-name>wicket.session</filter-name> <url-pattern>/servlet/*</url-pattern> </filter-mapping> <filter> <filter-name>open.hibernate.session.in.view</filter-name> <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class> </filter>  <filter-mapping> <filter-name>open.hibernate.session.in.view</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>

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Thread Local Memory for 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 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 ?

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how to manage svn repositories in xcode

- by ratnasomu

hellow all , i am using svn for my xcode project. now i added two files into current project and added to repository and commit changes for classes folder. But,when i am trying to commit entire project i am getting error like "Error: 155005 (Working copy not locked; this is probably a bug, please report) Description: Commit failed (details follow): Error: 155005 (Working copy not locked; this is probably a bug, please report) Description: Directory '/Users/gopalmadhu/Desktop/All My data/Schduler current code/build/Debug-iphonesimulator/scheduler.app.dSYM/.svn' containing working copy admin area is missing " due to this the classes that are already checked -in also not getting visible when i check out my code . the files are in the project but not visible.so i need to add them again from the project floder to classes folder. this is not correct way of managing the svn.. so wht can i do to solve my problem .coud anyone help me solve this. Thanks ..

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Restoring a subversion repository to workcopy revision

- by tinny

My subversion VM died the other day (host hardware melted) and I had to restore a backed up copy of the vmware server image. The restore went well and the VM is running again on a new host. The problem I have is that my restored repository is at revision 60 but my working copy on my PC is at 66. When I try and commit my working copy I get the following error message. svn: Commit failed (details follow): svn: No such revision 61 What is the best way to force this commit and bring subversion up to the same revision as my working copy? Thanks

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git and local modifications

- by user362073

Hi I am discovering how to use git. I just made the following test: create a folder and 2 files then git init, git add ., git commit -m "initial commit" create a branch: git branch experimental, git checkout experimental then change the name of the folder and delete one of the files, then git add ., git commit -m "experimental" go back to master: git checkout master Surprise: I do not find the master as I left it; the folder has disappeared. And I have to do a git -reset --hard to find my folder. I wonder if I did something wrong or if I have not understood how git manages local changes. Thanks for your help.

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Available options for hosting FTP server in .NET application

- by duane

I need to implement an FTP service inside my .NET application (running as a Windows Service) and have not had much luck finding good/current source code or vendors. Ideally it needs to be able to respond to the basic FTP Protocol and accept the data stream from an upload via a stream, enabling me to process the data as it is being received (think on the fly hashing). I need to be able to integrate it into my service because it will stack on top of our current code base with an existing custom TCP/IP communication protocol. I don't want to write (and then spend time debugging and performance testing) my own protocol, or implementation. I have already found plenty of ftp client implementations, I just need an acceptable server solution.

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No such directory when committing files using CVS from Eclipse

- by Peter

Hi all I am using Eclipse solely as a CVS client. Mostly it works very good, but once in a while, when I am right-clicking a file to commit it (a file that it itself says is changed and ready for commit), it tells me "cvs [server aborted]: no such directory `...' But the directory DOES exist?! If I navigate to the folder using tortoise CVS and right click for commit, it works fine? (this is the way I finally have to get those files committed) Has anyone experienced this as well, and more importantly - has anyone solved it? :) I am running Vista on the client PC and the CVS server is a Windows Server 2003 (please dont tell me to just switch to Linux - that is not much help). Thank you very much for your help!

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How to learn more XMPP/Jabber command

- by user359277

Hi, I am using ejabberd as a chatting server now. And I am writing a client to chat and register new user. Right now, I know some of the protocol to register a new account, like sending the following command to register new user: <iq type="set"><query xmlns="jabber:iq:register"><username>wfwfewegwegwewefg</username><password>wfwefwefwefwef</password></query></iq> My question is: I want to learn more command/protocol to talk to the server. So where can I learn more? For example, How can I ask the server if the user name exists or not. How can I ask the server to unregister a user. What is the key word I should search for? Should I search for Jabber XMPP protocol or what? Thanks

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Wrong code coverage on of unit test

- by KamilPyc

I'm using code coverage for unit tests in Xcode. Everything is working except some special cases, for example protocol declaration shows wrong values. If I have : @protocol SomeProtocole <NSObject> @property (nonatomic, readonly) NSObject *example; @end I will get 0% code coverage for this file. But I have unit test that is using class that conforms to that protocol. Only solution I found so far is to filter code coverage raport to not include protocols. But I would like to see real values for protocols. Any one have some solution to fix it?

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