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Search found 11 results on 1 pages for 'tylerl'.

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• Benefits of classic OOP over Go-like language

  - by tylerl

  I've been thinking a lot about language design and what elements would be necessary for an "ideal" programming language, and studying Google's Go has led me to question a lot of otherwise common knowledge. Specifically, Go seems to have all of the interesting benefits from object oriented programming without actually having any of the structure of an object oriented language. There are no classes, only structures; there is no class/structure inheritance -- only structure embedding. There aren't any hierarchies, no parent classes, no explicit interface implementations. Instead, type casting rules are based on a loose system similar to duck-typing, such that if a struct implements the necessary elements of a "Reader" or a "Request" or an "Encoding", then you can cast it and use it as one. Does such a system obsolete the concept of OOP? Or is there something about OOP as implemented in C++ and Java and C# that is inherently more capable, more maintainable, somehow more powerful that you have to give up when moving to a language like Go? What benefit do you have to give up to gain the simplicity that this new paradigm represents?

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• Use IPtables or null route for blacklisting about 1 million IP addresses?

  - by tylerl

  I've come across a situation where a client needs to blacklist a set of just under 1 million individual IP addresses (no subnets), and network performance is a concern. While I would conjecture that IPTables rules would have less of a performance impact than routes, that's just conjecture. Does anyone have any solid evidence or other justification for favoring either IPTables or null routing as solution for blacklisting long lists of IP addresses? In this case everything is automated, so ease-of-use isn't really a concern.

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• postfix specify limited relay domain while allowing sasl-auth relay

  - by tylerl

  I'm trying to set up postfix to allow relaying under a limited set of conditions: The destination domain is one of a pre-defined list -or- The client successfully logs in Here's the relevant bits o' config: smtpd_sasl_auth_enable=yes relay_domains=example.com smtpd_recipient_restrictions=permit_auth_destination,reject_unauth_destination smtpd_client_restrictions=permit_sasl_authenticated,reject The problem is that it requires that BOTH restrictions be satisfied, rather than either-or. Which is to say, it only allows relaying if the client is authenticated AND the recipient domain is @example.com. Instead, I need it to allow relaying if either one of the requirements is satisfied. How do I do this without resorting to running SMTP on two separate ports with different rules? Note: The context is an outbound-use-only (bound to 127.0.0.1) MTA on a shared web server which all site owners are allowed to relay mail to one of the "owned" domains (not server-local, though), and for which a limited set of "trusted" site owners are allowed to relay mail without restriction provided they have a valid SMTP login.

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• How will I support 100,000 requests an hour?!

  - by tylerl

  I know this question is a little strange but I got lucky with an idea and I need some numbers to use for when I try to make a deal with a company. I'm wondering how much it'll cost me to run a site that's heavy on PHP and gets between 70,000 and 100,000 requests an hour on something like Rackspace's Cloud Servers. I have no idea how many servers I need or how much RAM each one should have. There will be a decent number of images on the site (probably something like 10,000 in the first couple weeks) and the site runs on about 2,500 lines of PHP code. I figure I should sign up for a CDN of some kind, although CDN In A Box is all I've heard of and I'm not sure it's necessary for a site that's already on a cloud platform. I've obviously never done anything like this before so I'm just looking to get an estimation of what I need for this massive site... Also, I use a database and I was wondering how that works - would I dedicate one of the cloud servers to running the database or would I need to put the database into each of the cloud servers? Thanks in advance...

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• SQL Server 2005 Default Backup Plan

  - by tylerl

  I noticed that a newly imported database on SQLServer 2005 had configured itself (without my knowledge) to perform daily backups; but it's not deleting old files and quickly filling up the disk. I don't know how the backup job got configured (maybe that's something that gets transferred when you move a database?) but I'm having trouble modifying it. The backup runs as part of SQL Server Agent job called "Daily Backups". This job runs a package called "(SSIS Packages)\Maintenance Plans\Backup Plan" -- which I can't find. The "Management\Maintenance Plans" area for my server is empty. I imagine I could delete the existing plan and re-create it manually, but I was hoping to just modify what was already there, since all that's missing is deleting old files.

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• virtual disk image - file or partition

  - by tylerl

  I'm looking at the differences between using a file versus a partition to store a virtual disk image in VM use. The common knowledge is that partition-based images are faster than file-based images because of a decreased overhead. It makes sense, but I've never seen any actual numbers. My own testing bears out a different result. When I benchmark a direct-to-partition virtual disk, then format that same partition with ext4, create a virtual disk image stored on that ext4 filesystem, and then benchmark that, I see no speedup at all for the direct-to-partition virtual disk. Instead on some systems the file-based image is even faster (possibly due to host OS caching or something like that). This test was repeated many times on many systems, with fairly consistent results. So perhaps throwing out the performance justification, is it still considered better to use a partition rather than a virtual disk image? Is there some other reason why direct partition access is better than image files? Or perhaps is there some reason to go the other way around? Perhaps an advantage in one of the virtual disk file formats that you don't get with raw partition images?

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• Notepad++ "Compress whitespace" effect

  - by tylerl

  I'm looking for a mechanism within notepad++ to replace runs of consecutive whitespace with a single space, like the "Compress whitespace" command in notepad2. Essentially, in regex form: s/\s+/ /g I know I can do it with the find-replace form, but I would prefer soemthing that I can bind to a keyboard sequence. EDIT Find and replace cannot be recorded as a macro in some versions of Notepad++. Update to the latest if you have trouble.

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• Get directory path by fd

  - by tylerl

  I've run into the need to be able refer to a directory by path given its file descriptor in Linux. The path doesn't have to be canonical, it just has to be functional so that I can pass it to other functions. So, taking the same parameters as passed to a function like fstatat(), I need to be able to call a function like getxattr() which doesn't have a f-XYZ-at() variant. So far I've come up with these solutions; though none are particularly elegant. The simplest solution is to avoid the problem by calling openat() and then using a function like fgetxattr(). This works, but not in every situation. So another method is needed to fill the gaps. The next solution involves looking up the information in proc: if (!access("/proc/self/fd",X_OK)) { sprintf(path,"/proc/self/fd/%i/",fd); } This, of course, totally breaks on systems without proc, including some chroot environments. The last option, a more portable but potentially-race-condition-prone solution, looks like this: DIR* save = opendir("."); fchdir(fd); getcwd(path,PATH_MAX); fchdir(dirfd(save)); closedir(save); The obvious problem here is that in a multithreaded app, changing the working directory around could have side effects. However, the fact that it works is compelling: if I can get the path of a directory by calling fchdir() followed by getcwd(), why shouldn't I be able to just get the information directly: fgetcwd() or something. Clearly the kernel is tracking the necessary information. So how do I get to it?

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• Change library load order at run time (like LD_PRELOAD but during execution)

  - by tylerl

  How do I change the library a function loads from during run time? For example, say I want to replace the standard printf function with something new, I can write my own version and compile it into a shared library, then put "LD_PRELOAD=/my/library.so" in the environment before running my executable. But let's say that instead, I want to change that linkage from within the program itself. Surely that must be possible... right?

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• Random-access archive for Unix use

  - by tylerl

  I'm looking for a good format for archiving entire file-systems of old Linux computers. TAR.GZ The tar.gz format is great for archiving files with UNIX-style attributes, but since the compression is applied across the entire archive, the design precludes random-access. Instead, if you want to access a file at the end of the archive, you have to start at the beginning and decompress the whole file (which could be several hundred GB) up to the point where you find the entry you're looking for. ZIP Conversely, one selling point of the ZIP format is that it stores an index of the archive: filenames are stored separately with pointers to the location within the archive were to find the data. If I want to extract a file at the end, I look up the position of that file by name, seek to the location, and extract the data. However, it doesn't store file attributes such as ownership, permissions, symbolic links, etc. Other options? I've tried using squashfs, but it's not really designed for this purpose. The file format is not consistent between versions, and building the archive takes a lot of time and space. What other options might suit this purpose better?

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• Handling right-click within a MenuItem

  - by tylerl

  Is it possible to check for a right-click on a menu item in .NET? It appears that the framework doesn't expose it as an Event, but I've seen other applications (like Chrome and Firefox) which allow you to bring up a right-click context menu for a menu item. Presumably with a little event-loop magic you can do the same thing in .NET, right?

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