Monday, July 14, 2014

SQL Relay - 0.56 is out

SQL Relay version 0.56 is now available!

You might want to get this one. A subtle memory leak is fixed in this release. If you really can't upgrade and need a fix for a previous release, contact me and we can work something out.

Amazing new features:

Perl, PHP, Python and Java API's all build and work on Windows. You still have to build them from source though, and it's a pain. If you need Windows binaries, contact me and we can work something out.

Intelligent defaults have been added for a lot of the configuration parameters. The sqlrelay.conf file can be much more stripped down now. I also added a Configuration Guide that walks you through various configurations from minimal to complex. Enjoy.

The PHP PDO API now has a custom statement attribute PDO::SQLRELAY_ATTR_GET_NULLS_AS_EMPTY_STRINGS that can be set to true or false to cause it to return NULL values as NULLs or empty strings.

New parameters have been added for connecting to MySQL via SSL. See the Configuration Reference for more detail.

Amazing bug fixes:

The PHP PDO driver handles float values correctly now. Previously it was converting them to strings. It also handles NULL integers correctly now rather than converting them to 0's.

There was a bug in the sqlr-scaler that could cause it to use a noticeable amount of the CPU when sitting idle. That's fixed now.

Some installations of Oracle instant client might not have been properly detected before, but they are now.

There was a bug that caused problems with DB2 7.X. It's fixed now.

sessionhandler="thread" and listenertimeout!="0" ought to work now. This is still sketchy and experimental though.

Internal stuff:

A lot of code has been reorganized internally. Many things have been modularized and simplified. Frameworks have been built and some things have been re-implemented using them. This is ongoing. More of this will be done over the next few releases.

Full ChangeLog follows:

  • removed VERSION from perl api bootstrap
  • reorganized and simplified perl api code
  • got perl api working on windows with ActivePerl
  • perl api uninstall cleans up better now
  • got python api working on windows with ActivePython
  • consolidated php include tweaks
  • got java api working on windows
  • updated pdo driver to convert float fields to strings rather than ints
  • updated pthread test to match rudiments pthread test
  • moved everything done by children of sqlwriter interface into individual translations
  • added plugin-based authentication framework
  • reorganized code tree a bit
  • reworked default values to enable more minimal configurations
  • updated configuration docs and added configuration guide
  • fixed cast issue with firebird 1.5
  • added result set translation framework and re-implemented date translation using it
  • fixed millisecond->nanosecond confusion in sqlr-scaler
  • fixed subtle oracle instantclient version detection bug
  • added null input bind support to sqlrsh
  • fixed php pdo driver to return null rather than 0 for null integer fields and bind null rather than 0 for null integer input binds
  • added attribute to return nulls as nulls or empty strings to php pdo
  • added parameters for connecting to mysql via ssl
  • added a few tweaks to support DB2 < 8.0
  • fixed bad return value type in python getConnectionPort method
  • fixed sessionhandler="thread" with listenertimeout!="0"

Rudiments - 0.47 is out

For immediate release!

Rudiments 0.47 is now available.

This update to rudiments fixes a few obscure things including a memory leak in the datetime class that could cause SQL Relay to chew up memory (very slowly) and a potential null-dereference in the xmldomnode class. Not sure how I ever missed those bugs before, given how often I use those classes, but at least they're fixed now.

Another significant update in this release is internal support for poll, epoll and kqueue. In the past, the listener class used select exclusively, but select has some issues. Most notably, attempting to listen on "large numbers" (more than 1024 on most systems) of file descriptors could cause undefined problems (references beyond the end of a 1024-member array). Now, if the platform supports epoll (like most modern linux systems) or kqueue (like most modern BSD systems) then those will be used in favor of select. If the platform supports neither epoll nor kqueue, but supports regular poll, then poll will also be used in favor of select. /dev/poll is not yet supported on solaris yet, but it's on the TODO list. Also, the poll/epoll/kqueue implementations aren't optimized yet. They still do inefficient things like rebuild the list of file descriptors every time, which has to be done with select, but they are a bit faster than select, and safe for large numbers of file descriptors.

Two classes have been renamed to be more consistent - variablebuffer is now bytebuffer and rawbuffer is now bytestring. Hey, it's pre-1.0 software. Things get renamed.

The linkedlist class has been refactored and a singlylinkedlist class has been added. Both now have sort methods now too: selectionSort() and heapSort(). Writing them took me back to my data structures class in college. selectionSort() is slow but uses no additional storage. heapSort() is much faster but uses N additional storage. Choose!

I also fixed an obscure bug on windows involving file::open() with O_CREAT but not O_EXCL.

Solaris 2.5.1 is also supported, just in case anyone still uses that!

Full ChangeLog follows:

  • fixed possible null-dereference in xmldomnode::safeAppend
  • added charstring::inSetIgnoringCase
  • xmldomnode::setAttributeValue does nothing when the null node is referenced now
  • fixed a codetree bug that could cause indentation to attempt to go negative when using an unsigned number
  • added a configure test to see if -Wno-format is needed
  • configure tests for mlockall/munlockall attempt link now
  • added sys/types.h before sys/un.h in sys/un.h test for older freebsd
  • implemented stubs for pure virtual methods of client and server classes so instances of them could be created to attach already-open file descriptors to
  • unified usage of select/poll and prefer poll
  • pushed all select/poll-related code into listener class
  • removed problematic and unused useListener-related methods in filedescriptor class
  • epoll is used in place of select/poll for systems that support it
  • kqueue is used in place of select/poll for systems that support it
  • consolidated getpagesize() calls to use sys::getPageSize()
  • added detection and support for __vsnprintf for platforms that have that instead of vsnprintf
  • added cancel and raiseSignal methods to the thread class
  • fixed datetime memory leak
  • added xmldomnode::clone method to clone a node
  • renamed variablebuffer to bytebuffer
  • renamed rawbuffer to bytestring
  • refactored linkedlist
  • added singlylinkedlist class
  • added sort, detach, move and insert methods to linkedlist classes
  • fixed file::open using O_CREAT without O_EXCL on windows