From 8bb56fec42d5dc92bceb83389d7b9bf8acb38061 Mon Sep 17 00:00:00 2001 From: glyn Date: Sun, 26 Jun 2011 22:06:53 +0100 Subject: [PATCH 1/1] Initial checkin --- .gitignore | 2 + LICENCE | 674 +++++++++++++++++++++++++++++++++++++++++++++++++++ README.md | 73 ++++++ pg_sched.pl | 461 +++++++++++++++++++++++++++++++++++ pg_sched.sql | 56 +++++ 5 files changed, 1266 insertions(+) create mode 100644 .gitignore create mode 100644 LICENCE create mode 100644 README.md create mode 100755 pg_sched.pl create mode 100644 pg_sched.sql diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..fafff2e --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +.DS_Store +Thumbs.db diff --git a/LICENCE b/LICENCE new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/LICENCE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +them if you wish), that you receive source code or can get it if you +want it, that you can change the software or use pieces of it in new +free programs, and that you know you can do these things. + + To protect your rights, we need to prevent others from denying you +these rights or asking you to surrender the rights. Therefore, you have +certain responsibilities if you distribute copies of the software, or if +you modify it: responsibilities to respect the freedom of others. + + For example, if you distribute copies of such a program, whether +gratis or for a fee, you must pass on to the recipients the same +freedoms that you received. You must make sure that they, too, receive +or can get the source code. And you must show them these terms so they +know their rights. + + Developers that use the GNU GPL protect your rights with two steps: +(1) assert copyright on the software, and (2) offer you this License +giving you legal permission to copy, distribute and/or modify it. + + For the developers' and authors' protection, the GPL clearly explains +that there is no warranty for this free software. For both users' and +authors' sake, the GPL requires that modified versions be marked as +changed, so that their problems will not be attributed erroneously to +authors of previous versions. + + Some devices are designed to deny users access to install or run +modified versions of the software inside them, although the manufacturer +can do so. This is fundamentally incompatible with the aim of +protecting users' freedom to change the software. The systematic +pattern of such abuse occurs in the area of products for individuals to +use, which is precisely where it is most unacceptable. Therefore, we +have designed this version of the GPL to prohibit the practice for those +products. If such problems arise substantially in other domains, we +stand ready to extend this provision to those domains in future versions +of the GPL, as needed to protect the freedom of users. + + Finally, every program is threatened constantly by software patents. +States should not allow patents to restrict development and use of +software on general-purpose computers, but in those that do, we wish to +avoid the special danger that patents applied to a free program could +make it effectively proprietary. To prevent this, the GPL assures that +patents cannot be used to render the program non-free. + + The precise terms and conditions for copying, distribution and +modification follow. + + TERMS AND CONDITIONS + + 0. Definitions. + + "This License" refers to version 3 of the GNU General Public License. + + "Copyright" also means copyright-like laws that apply to other kinds of +works, such as semiconductor masks. + + "The Program" refers to any copyrightable work licensed under this +License. Each licensee is addressed as "you". "Licensees" and +"recipients" may be individuals or organizations. + + To "modify" a work means to copy from or adapt all or part of the work +in a fashion requiring copyright permission, other than the making of an +exact copy. The resulting work is called a "modified version" of the +earlier work or a work "based on" the earlier work. + + A "covered work" means either the unmodified Program or a work based +on the Program. + + To "propagate" a work means to do anything with it that, without +permission, would make you directly or secondarily liable for +infringement under applicable copyright law, except executing it on a +computer or modifying a private copy. Propagation includes copying, +distribution (with or without modification), making available to the +public, and in some countries other activities as well. + + To "convey" a work means any kind of propagation that enables other +parties to make or receive copies. Mere interaction with a user through +a computer network, with no transfer of a copy, is not conveying. + + An interactive user interface displays "Appropriate Legal Notices" +to the extent that it includes a convenient and prominently visible +feature that (1) displays an appropriate copyright notice, and (2) +tells the user that there is no warranty for the work (except to the +extent that warranties are provided), that licensees may convey the +work under this License, and how to view a copy of this License. If +the interface presents a list of user commands or options, such as a +menu, a prominent item in the list meets this criterion. + + 1. Source Code. + + The "source code" for a work means the preferred form of the work +for making modifications to it. "Object code" means any non-source +form of a work. + + A "Standard Interface" means an interface that either is an official +standard defined by a recognized standards body, or, in the case of +interfaces specified for a particular programming language, one that +is widely used among developers working in that language. + + The "System Libraries" of an executable work include anything, other +than the work as a whole, that (a) is included in the normal form of +packaging a Major Component, but which is not part of that Major +Component, and (b) serves only to enable use of the work with that +Major Component, or to implement a Standard Interface for which an +implementation is available to the public in source code form. A +"Major Component", in this context, means a major essential component +(kernel, window system, and so on) of the specific operating system +(if any) on which the executable work runs, or a compiler used to +produce the work, or an object code interpreter used to run it. + + The "Corresponding Source" for a work in object code form means all +the source code needed to generate, install, and (for an executable +work) run the object code and to modify the work, including scripts to +control those activities. However, it does not include the work's +System Libraries, or general-purpose tools or generally available free +programs which are used unmodified in performing those activities but +which are not part of the work. For example, Corresponding Source +includes interface definition files associated with source files for +the work, and the source code for shared libraries and dynamically +linked subprograms that the work is specifically designed to require, +such as by intimate data communication or control flow between those +subprograms and other parts of the work. + + The Corresponding Source need not include anything that users +can regenerate automatically from other parts of the Corresponding +Source. + + The Corresponding Source for a work in source code form is that +same work. + + 2. Basic Permissions. + + All rights granted under this License are granted for the term of +copyright on the Program, and are irrevocable provided the stated +conditions are met. This License explicitly affirms your unlimited +permission to run the unmodified Program. The output from running a +covered work is covered by this License only if the output, given its +content, constitutes a covered work. This License acknowledges your +rights of fair use or other equivalent, as provided by copyright law. + + You may make, run and propagate covered works that you do not +convey, without conditions so long as your license otherwise remains +in force. You may convey covered works to others for the sole purpose +of having them make modifications exclusively for you, or provide you +with facilities for running those works, provided that you comply with +the terms of this License in conveying all material for which you do +not control copyright. Those thus making or running the covered works +for you must do so exclusively on your behalf, under your direction +and control, on terms that prohibit them from making any copies of +your copyrighted material outside their relationship with you. + + Conveying under any other circumstances is permitted solely under +the conditions stated below. Sublicensing is not allowed; section 10 +makes it unnecessary. + + 3. Protecting Users' Legal Rights From Anti-Circumvention Law. + + No covered work shall be deemed part of an effective technological +measure under any applicable law fulfilling obligations under article +11 of the WIPO copyright treaty adopted on 20 December 1996, or +similar laws prohibiting or restricting circumvention of such +measures. + + When you convey a covered work, you waive any legal power to forbid +circumvention of technological measures to the extent such circumvention +is effected by exercising rights under this License with respect to +the covered work, and you disclaim any intention to limit operation or +modification of the work as a means of enforcing, against the work's +users, your or third parties' legal rights to forbid circumvention of +technological measures. + + 4. Conveying Verbatim Copies. + + You may convey verbatim copies of the Program's source code as you +receive it, in any medium, provided that you conspicuously and +appropriately publish on each copy an appropriate copyright notice; +keep intact all notices stating that this License and any +non-permissive terms added in accord with section 7 apply to the code; +keep intact all notices of the absence of any warranty; and give all +recipients a copy of this License along with the Program. + + You may charge any price or no price for each copy that you convey, +and you may offer support or warranty protection for a fee. + + 5. Conveying Modified Source Versions. + + You may convey a work based on the Program, or the modifications to +produce it from the Program, in the form of source code under the +terms of section 4, provided that you also meet all of these conditions: + + a) The work must carry prominent notices stating that you modified + it, and giving a relevant date. + + b) The work must carry prominent notices stating that it is + released under this License and any conditions added under section + 7. This requirement modifies the requirement in section 4 to + "keep intact all notices". + + c) You must license the entire work, as a whole, under this + License to anyone who comes into possession of a copy. This + License will therefore apply, along with any applicable section 7 + additional terms, to the whole of the work, and all its parts, + regardless of how they are packaged. This License gives no + permission to license the work in any other way, but it does not + invalidate such permission if you have separately received it. + + d) If the work has interactive user interfaces, each must display + Appropriate Legal Notices; however, if the Program has interactive + interfaces that do not display Appropriate Legal Notices, your + work need not make them do so. + + A compilation of a covered work with other separate and independent +works, which are not by their nature extensions of the covered work, +and which are not combined with it such as to form a larger program, +in or on a volume of a storage or distribution medium, is called an +"aggregate" if the compilation and its resulting copyright are not +used to limit the access or legal rights of the compilation's users +beyond what the individual works permit. Inclusion of a covered work +in an aggregate does not cause this License to apply to the other +parts of the aggregate. + + 6. Conveying Non-Source Forms. + + You may convey a covered work in object code form under the terms +of sections 4 and 5, provided that you also convey the +machine-readable Corresponding Source under the terms of this License, +in one of these ways: + + a) Convey the object code in, or embodied in, a physical product + (including a physical distribution medium), accompanied by the + Corresponding Source fixed on a durable physical medium + customarily used for software interchange. + + b) Convey the object code in, or embodied in, a physical product + (including a physical distribution medium), accompanied by a + written offer, valid for at least three years and valid for as + long as you offer spare parts or customer support for that product + model, to give anyone who possesses the object code either (1) a + copy of the Corresponding Source for all the software in the + product that is covered by this License, on a durable physical + medium customarily used for software interchange, for a price no + more than your reasonable cost of physically performing this + conveying of source, or (2) access to copy the + Corresponding Source from a network server at no charge. + + c) Convey individual copies of the object code with a copy of the + written offer to provide the Corresponding Source. This + alternative is allowed only occasionally and noncommercially, and + only if you received the object code with such an offer, in accord + with subsection 6b. + + d) Convey the object code by offering access from a designated + place (gratis or for a charge), and offer equivalent access to the + Corresponding Source in the same way through the same place at no + further charge. You need not require recipients to copy the + Corresponding Source along with the object code. If the place to + copy the object code is a network server, the Corresponding Source + may be on a different server (operated by you or a third party) + that supports equivalent copying facilities, provided you maintain + clear directions next to the object code saying where to find the + Corresponding Source. Regardless of what server hosts the + Corresponding Source, you remain obligated to ensure that it is + available for as long as needed to satisfy these requirements. + + e) Convey the object code using peer-to-peer transmission, provided + you inform other peers where the object code and Corresponding + Source of the work are being offered to the general public at no + charge under subsection 6d. + + A separable portion of the object code, whose source code is excluded +from the Corresponding Source as a System Library, need not be +included in conveying the object code work. + + A "User Product" is either (1) a "consumer product", which means any +tangible personal property which is normally used for personal, family, +or household purposes, or (2) anything designed or sold for incorporation +into a dwelling. In determining whether a product is a consumer product, +doubtful cases shall be resolved in favor of coverage. For a particular +product received by a particular user, "normally used" refers to a +typical or common use of that class of product, regardless of the status +of the particular user or of the way in which the particular user +actually uses, or expects or is expected to use, the product. A product +is a consumer product regardless of whether the product has substantial +commercial, industrial or non-consumer uses, unless such uses represent +the only significant mode of use of the product. + + "Installation Information" for a User Product means any methods, +procedures, authorization keys, or other information required to install +and execute modified versions of a covered work in that User Product from +a modified version of its Corresponding Source. The information must +suffice to ensure that the continued functioning of the modified object +code is in no case prevented or interfered with solely because +modification has been made. + + If you convey an object code work under this section in, or with, or +specifically for use in, a User Product, and the conveying occurs as +part of a transaction in which the right of possession and use of the +User Product is transferred to the recipient in perpetuity or for a +fixed term (regardless of how the transaction is characterized), the +Corresponding Source conveyed under this section must be accompanied +by the Installation Information. But this requirement does not apply +if neither you nor any third party retains the ability to install +modified object code on the User Product (for example, the work has +been installed in ROM). + + The requirement to provide Installation Information does not include a +requirement to continue to provide support service, warranty, or updates +for a work that has been modified or installed by the recipient, or for +the User Product in which it has been modified or installed. Access to a +network may be denied when the modification itself materially and +adversely affects the operation of the network or violates the rules and +protocols for communication across the network. + + Corresponding Source conveyed, and Installation Information provided, +in accord with this section must be in a format that is publicly +documented (and with an implementation available to the public in +source code form), and must require no special password or key for +unpacking, reading or copying. + + 7. Additional Terms. + + "Additional permissions" are terms that supplement the terms of this +License by making exceptions from one or more of its conditions. +Additional permissions that are applicable to the entire Program shall +be treated as though they were included in this License, to the extent +that they are valid under applicable law. If additional permissions +apply only to part of the Program, that part may be used separately +under those permissions, but the entire Program remains governed by +this License without regard to the additional permissions. + + When you convey a copy of a covered work, you may at your option +remove any additional permissions from that copy, or from any part of +it. (Additional permissions may be written to require their own +removal in certain cases when you modify the work.) You may place +additional permissions on material, added by you to a covered work, +for which you have or can give appropriate copyright permission. + + Notwithstanding any other provision of this License, for material you +add to a covered work, you may (if authorized by the copyright holders of +that material) supplement the terms of this License with terms: + + a) Disclaiming warranty or limiting liability differently from the + terms of sections 15 and 16 of this License; or + + b) Requiring preservation of specified reasonable legal notices or + author attributions in that material or in the Appropriate Legal + Notices displayed by works containing it; or + + c) Prohibiting misrepresentation of the origin of that material, or + requiring that modified versions of such material be marked in + reasonable ways as different from the original version; or + + d) Limiting the use for publicity purposes of names of licensors or + authors of the material; or + + e) Declining to grant rights under trademark law for use of some + trade names, trademarks, or service marks; or + + f) Requiring indemnification of licensors and authors of that + material by anyone who conveys the material (or modified versions of + it) with contractual assumptions of liability to the recipient, for + any liability that these contractual assumptions directly impose on + those licensors and authors. + + All other non-permissive additional terms are considered "further +restrictions" within the meaning of section 10. If the Program as you +received it, or any part of it, contains a notice stating that it is +governed by this License along with a term that is a further +restriction, you may remove that term. If a license document contains +a further restriction but permits relicensing or conveying under this +License, you may add to a covered work material governed by the terms +of that license document, provided that the further restriction does +not survive such relicensing or conveying. + + If you add terms to a covered work in accord with this section, you +must place, in the relevant source files, a statement of the +additional terms that apply to those files, or a notice indicating +where to find the applicable terms. + + Additional terms, permissive or non-permissive, may be stated in the +form of a separately written license, or stated as exceptions; +the above requirements apply either way. + + 8. Termination. + + You may not propagate or modify a covered work except as expressly +provided under this License. Any attempt otherwise to propagate or +modify it is void, and will automatically terminate your rights under +this License (including any patent licenses granted under the third +paragraph of section 11). + + However, if you cease all violation of this License, then your +license from a particular copyright holder is reinstated (a) +provisionally, unless and until the copyright holder explicitly and +finally terminates your license, and (b) permanently, if the copyright +holder fails to notify you of the violation by some reasonable means +prior to 60 days after the cessation. + + Moreover, your license from a particular copyright holder is +reinstated permanently if the copyright holder notifies you of the +violation by some reasonable means, this is the first time you have +received notice of violation of this License (for any work) from that +copyright holder, and you cure the violation prior to 30 days after +your receipt of the notice. + + Termination of your rights under this section does not terminate the +licenses of parties who have received copies or rights from you under +this License. If your rights have been terminated and not permanently +reinstated, you do not qualify to receive new licenses for the same +material under section 10. + + 9. Acceptance Not Required for Having Copies. + + You are not required to accept this License in order to receive or +run a copy of the Program. Ancillary propagation of a covered work +occurring solely as a consequence of using peer-to-peer transmission +to receive a copy likewise does not require acceptance. However, +nothing other than this License grants you permission to propagate or +modify any covered work. These actions infringe copyright if you do +not accept this License. Therefore, by modifying or propagating a +covered work, you indicate your acceptance of this License to do so. + + 10. Automatic Licensing of Downstream Recipients. + + Each time you convey a covered work, the recipient automatically +receives a license from the original licensors, to run, modify and +propagate that work, subject to this License. You are not responsible +for enforcing compliance by third parties with this License. + + An "entity transaction" is a transaction transferring control of an +organization, or substantially all assets of one, or subdividing an +organization, or merging organizations. If propagation of a covered +work results from an entity transaction, each party to that +transaction who receives a copy of the work also receives whatever +licenses to the work the party's predecessor in interest had or could +give under the previous paragraph, plus a right to possession of the +Corresponding Source of the work from the predecessor in interest, if +the predecessor has it or can get it with reasonable efforts. + + You may not impose any further restrictions on the exercise of the +rights granted or affirmed under this License. For example, you may +not impose a license fee, royalty, or other charge for exercise of +rights granted under this License, and you may not initiate litigation +(including a cross-claim or counterclaim in a lawsuit) alleging that +any patent claim is infringed by making, using, selling, offering for +sale, or importing the Program or any portion of it. + + 11. Patents. + + A "contributor" is a copyright holder who authorizes use under this +License of the Program or a work on which the Program is based. The +work thus licensed is called the contributor's "contributor version". + + A contributor's "essential patent claims" are all patent claims +owned or controlled by the contributor, whether already acquired or +hereafter acquired, that would be infringed by some manner, permitted +by this License, of making, using, or selling its contributor version, +but do not include claims that would be infringed only as a +consequence of further modification of the contributor version. For +purposes of this definition, "control" includes the right to grant +patent sublicenses in a manner consistent with the requirements of +this License. + + Each contributor grants you a non-exclusive, worldwide, royalty-free +patent license under the contributor's essential patent claims, to +make, use, sell, offer for sale, import and otherwise run, modify and +propagate the contents of its contributor version. + + In the following three paragraphs, a "patent license" is any express +agreement or commitment, however denominated, not to enforce a patent +(such as an express permission to practice a patent or covenant not to +sue for patent infringement). To "grant" such a patent license to a +party means to make such an agreement or commitment not to enforce a +patent against the party. + + If you convey a covered work, knowingly relying on a patent license, +and the Corresponding Source of the work is not available for anyone +to copy, free of charge and under the terms of this License, through a +publicly available network server or other readily accessible means, +then you must either (1) cause the Corresponding Source to be so +available, or (2) arrange to deprive yourself of the benefit of the +patent license for this particular work, or (3) arrange, in a manner +consistent with the requirements of this License, to extend the patent +license to downstream recipients. "Knowingly relying" means you have +actual knowledge that, but for the patent license, your conveying the +covered work in a country, or your recipient's use of the covered work +in a country, would infringe one or more identifiable patents in that +country that you have reason to believe are valid. + + If, pursuant to or in connection with a single transaction or +arrangement, you convey, or propagate by procuring conveyance of, a +covered work, and grant a patent license to some of the parties +receiving the covered work authorizing them to use, propagate, modify +or convey a specific copy of the covered work, then the patent license +you grant is automatically extended to all recipients of the covered +work and works based on it. + + A patent license is "discriminatory" if it does not include within +the scope of its coverage, prohibits the exercise of, or is +conditioned on the non-exercise of one or more of the rights that are +specifically granted under this License. You may not convey a covered +work if you are a party to an arrangement with a third party that is +in the business of distributing software, under which you make payment +to the third party based on the extent of your activity of conveying +the work, and under which the third party grants, to any of the +parties who would receive the covered work from you, a discriminatory +patent license (a) in connection with copies of the covered work +conveyed by you (or copies made from those copies), or (b) primarily +for and in connection with specific products or compilations that +contain the covered work, unless you entered into that arrangement, +or that patent license was granted, prior to 28 March 2007. + + Nothing in this License shall be construed as excluding or limiting +any implied license or other defenses to infringement that may +otherwise be available to you under applicable patent law. + + 12. No Surrender of Others' Freedom. + + If conditions are imposed on you (whether by court order, agreement or +otherwise) that contradict the conditions of this License, they do not +excuse you from the conditions of this License. If you cannot convey a +covered work so as to satisfy simultaneously your obligations under this +License and any other pertinent obligations, then as a consequence you may +not convey it at all. For example, if you agree to terms that obligate you +to collect a royalty for further conveying from those to whom you convey +the Program, the only way you could satisfy both those terms and this +License would be to refrain entirely from conveying the Program. + + 13. Use with the GNU Affero General Public License. + + Notwithstanding any other provision of this License, you have +permission to link or combine any covered work with a work licensed +under version 3 of the GNU Affero General Public License into a single +combined work, and to convey the resulting work. The terms of this +License will continue to apply to the part which is the covered work, +but the special requirements of the GNU Affero General Public License, +section 13, concerning interaction through a network will apply to the +combination as such. + + 14. Revised Versions of this License. + + The Free Software Foundation may publish revised and/or new versions of +the GNU General Public License from time to time. Such new versions will +be similar in spirit to the present version, but may differ in detail to +address new problems or concerns. + + Each version is given a distinguishing version number. If the +Program specifies that a certain numbered version of the GNU General +Public License "or any later version" applies to it, you have the +option of following the terms and conditions either of that numbered +version or of any later version published by the Free Software +Foundation. If the Program does not specify a version number of the +GNU General Public License, you may choose any version ever published +by the Free Software Foundation. + + If the Program specifies that a proxy can decide which future +versions of the GNU General Public License can be used, that proxy's +public statement of acceptance of a version permanently authorizes you +to choose that version for the Program. + + Later license versions may give you additional or different +permissions. However, no additional obligations are imposed on any +author or copyright holder as a result of your choosing to follow a +later version. + + 15. Disclaimer of Warranty. + + THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY +APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT +HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY +OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, +THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM +IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF +ALL NECESSARY SERVICING, REPAIR OR CORRECTION. + + 16. Limitation of Liability. + + IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS +THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY +GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE +USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF +DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD +PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), +EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF +SUCH DAMAGES. + + 17. Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..516bcc7 --- /dev/null +++ b/README.md @@ -0,0 +1,73 @@ +#PostgreSQL Scheduler + +Simple scheduler for running stored functions against databases in a +PostgreSQL cluster, with support for selective execution based on the +replication role of nodes in Slony-I clusters. + +The script is designed to be run once a minute from cron or similar, and +as such has a maximum resolution of 1 minute. It provides very simple +scheduling functionality to execute individual stored functions at +specified intervals and offsets (E.g. The most complex schedule would +be of the form "once every 5 hours at 20 minutes past the hour"). + +If you require more complex schedules or multi-step tasks try +pgAgent + +## Command line + +```bash +$ pg_sched.pl -h -p -d -U -n -t -cl -m -l + -h Hostname of database containing schedule table + DEFAULT = localhost + -p Listening port of database containing schedule table + DEFAULT = 5432 + -d Name of database containing schedule table + DEFAULT = postgres + -U User to connect to databse with, also used as default user for all tasks + DEFAULT = pg_sched + -n Name of schema containing schedule table + DEFAULT = public + -t Name of schedule table + DEFAULT = pg_sched + -cl Name of slony cluster. 'auto' to autodetect, 'off' to disable + DEFAULT = auto + -m Comma separated list of slony sets on the master. 'all' for all + DEFAULT = all + -l Lockfile used to prevent concurrent execution of tasks. + DEFAULT = not used +``` + +##Example usage + +Create a PostgreSQL user for schedule to run as, to run tasks under +different roles create the user as a superuser: + +```postgresql +mydb=> CREATE USER pg_sched WITH PASSWORD 'my_password' SUPERUSER ; +``` + +Create a pgpass file for the OS user that will run the script from cron: + +```bash +$ echo *:*:*:pg_sched:my_password >> /home/myuser/.pgpass +chmod 600 /home/myuser/.pgpass +``` + +Create the schedule table in your database of choice: + +```bash +$ psql -U pg_sched -d mydb -f pg_sched.sql +``` + +Add an entry to run from cron something like: + +```cron + * * * * * myuser /home/myuser/pg_sched.pl -d mydb -U pg_sched >> /var/log/pg_sched.log 2>&1 +``` + +Insert a row into the table to create a task, e.g: + +```postgresql +mydb=> INSERT INTO pg_sched (usename, datname, pronamespace, proname, proargs, proargtypes, enabled, frequency, frequency_offset) +VALUES ('test_user', 'mydb', 'pg_catalog', 'date_part', '{"hour", "2015-03-25 13:50:59"}', '{text, timestamp}', 'A', '1 hour', '1 minute'); +``` diff --git a/pg_sched.pl b/pg_sched.pl new file mode 100755 index 0000000..a62b7c0 --- /dev/null +++ b/pg_sched.pl @@ -0,0 +1,461 @@ +#!/usr/bin/perl + +# Script: pg_sched.pl +# Copyright: 26/06/2011: v1.0.0 Glyn Astill +# PostgreSQL 9.0+ (optional Slony-I) +# +# This script is a command-line utility to schedule execution of stored +# functions against databases in a PostgreSQL cluster, with support for +# selective execution based on the replication role of nodes in Slony-I +# clusters. +# +# The script is designed to be run from cron and has a maximum resolution +# of 1 minute. +# +# This script is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This script is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this script. If not, see . + +use strict; +use warnings; +use threads; +use Time::HiRes qw/gettimeofday/; +use DBI; +use sigtrap 'handler' => \&cleanExit, 'HUP', 'INT','ABRT','QUIT','TERM'; +use Getopt::Long qw/GetOptions/; +Getopt::Long::Configure('no_ignore_case'); +use vars qw{%opt}; + +use constant false => 0; +use constant true => 1; + +my $g_slony_cluster = "test_replication"; +my $g_dbhost = 'localhost'; +my $g_dbport = 5432; +my $g_dbname = 'postgres'; +my $g_dbuser = 'pg_sched'; +my $g_dbschema = 'public'; +my $g_dbtable = 'pg_sched'; +my $g_clname = 'auto'; +my $g_sets = 'all'; +my $g_usage = "pg_sched.pl -h -p -d -U -n -t
-cl -m -l + -h Hostname of database containing schedule table + DEFAULT = $g_dbhost + -p Listening port of database containing schedule table + DEFAULT = $g_dbport + -d Name of database containing schedule table + DEFAULT = $g_dbname + -U User to connect to databse with, also used as default user for all tasks + DEFAULT = $g_dbuser + -n Name of schema containing schedule table + DEFAULT = $g_dbschema + -t Name of schedule table + DEFAULT = $g_dbtable + -cl Name of slony cluster. 'auto' to autodetect, 'off' to disable + DEFAULT = $g_clname + -m Comma separated list of slony sets on the master. 'all' for all + DEFAULT = $g_sets + -l Lockfile used to prevent concurrent execution of tasks. + DEFAULT = not used +"; + +my @g_databases; +my $g_origin = false; +my @g_pronames; +my $g_errors; +my $g_lockfile; + +die $g_usage unless GetOptions(\%opt, 'host|H=s', 'port|p=i', 'dbname|d=s', 'user|U=s', 'schema|n=s', 'table|t=s', 'lockfile|l=s', 'clname|cl=s', 'msets|m=s'); + +if (defined($opt{host})) { + $g_dbhost = $opt{host}; +} +if (defined($opt{port})) { + $g_dbport = $opt{port}; +} +if (defined($opt{dbname})) { + $g_dbname = $opt{dbname}; +} +if (defined($opt{user})) { + $g_dbuser = $opt{user}; +} +if (defined($opt{schema})) { + $g_dbschema = $opt{schema}; +} +if (defined($opt{table})) { + $g_dbtable = $opt{table}; +} +if (defined($opt{lockfile})) { + $g_lockfile = $opt{lockfile}; +} +if (defined($opt{clname})) { + $g_clname = $opt{clname}; +} +if (defined($opt{msets})) { + $g_sets = $opt{msets}; +} + +# If lockfile supplied check if the script is already running +if (defined($g_lockfile)) { + schedLock($g_lockfile, 'lock'); +} + +# Get a list of databases in the postgresql cluster +@g_databases = loadDatabases($g_dbhost, $g_dbport, $g_dbname, $g_dbuser); + +# For each database get its replication status then get any work to do +undef @g_pronames; +foreach my $target_dbname (@g_databases) { + if ($g_clname ne 'off') { + $g_origin = checkSlony($g_dbhost, $g_dbport, $target_dbname, $g_dbuser, $g_clname, $g_sets); + } + else { + $g_origin = true; + } + @g_pronames = (@g_pronames, loadWork($g_dbhost, $g_dbport, $g_dbname, $g_dbuser, $g_dbschema, $g_dbtable, $g_origin, $target_dbname)); +} +# Do all the work we have collected for all databases +$g_errors = doWork(\@g_pronames, $g_dbhost, $g_dbport, $g_dbname, $g_dbuser, $g_dbschema, $g_dbtable); + +if ($g_errors > 0) { + warn ("ERROR: Encountered $g_errors errors processing the schedule\n") if $@; +} + +cleanExit($g_lockfile); + +sub cleanExit{ + my $lockfile = shift; + + if (defined($lockfile)) { + schedLock($lockfile, 'unlock'); + } + exit(0); +} + +sub schedLock{ + my $lockdir = shift; + my $op = shift; + + if ($op eq 'lock') { + eval { + mkdir($lockdir) or die "Can't make directory: $!"; + }; + die ("Script already running") if $@; + } + else { + eval { + rmdir $lockdir; + }; + die ("unable to remove lock\n") if $@; + } +} + +sub loadDatabases{ + my $dbhost = shift; + my $dbport = shift; + my $dbname = shift; + my $dbuser = shift; + my $dsn; + my $dbh; + my $sth; + my $query; + my @databases; + + $dsn = "DBI:Pg:dbname=$dbname;host=$dbhost;port=$dbport;"; + eval { + $dbh = DBI->connect($dsn, $dbuser); + { + $dbh->do("SET application_name = 'pg_sched'"); + + $query = "SELECT datname FROM pg_catalog.pg_database WHERE datallowconn AND NOT datistemplate;"; + + $sth = $dbh->prepare($query); + $sth->execute(); + + while (my $databasename = $sth->fetchrow) { + push(@databases, $databasename); + } + } + }; + warn ("ERROR: Loading databaees failed\n") if $@; + + return @databases; +} + +sub checkSlony{ + my $dbhost = shift; + my $dbport = shift; + my $target_dbname = shift; + my $dbuser = shift; + my $clname = shift; + my $sets = shift; + my $qw_clname; + my $dsn; + my $dbh; + my $sth; + my $query; + my $local_sets; + my $all_sets; + my $run_master = false; + + $dsn = "DBI:Pg:dbname=$target_dbname;host=$dbhost;port=$dbport;"; + eval { + $dbh = DBI->connect($dsn, $dbuser); + { + $dbh->do("SET application_name = 'pg_sched'"); + + if ($clname ne 'auto') { + $query = "SELECT substr(n.nspname,2) FROM pg_catalog.pg_namespace n WHERE n.nspname = ?;"; + } + else { + $query = "SELECT substr(n.nspname,2) FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON c.relnamespace = n.oid + WHERE c.relname = 'sl_set' AND c.relkind = 'r' GROUP BY n.nspname;"; + } + + $sth = $dbh->prepare($query); + + if ($clname ne 'auto') { + $sth->bind_param(1, "_" . $clname); + } + + $sth->execute(); + $clname = $sth->fetchrow; + + if (defined($clname)) { + $qw_clname = $dbh->quote_identifier("_" . $clname); + + $query = "SELECT count(*), sum(CASE WHEN s.set_origin = $qw_clname.getlocalnodeid(?::name) THEN 1 ELSE 0 END) + FROM $qw_clname.sl_set s" . (($sets ne 'all')?' WHERE s.set_id = ANY(?::integer[]);':';'); + + $sth = $dbh->prepare($query); + $sth->bind_param(1, "_" . $clname); + if ($sets ne 'all') { + $sth->bind_param(2, [ split(',', $sets) ]); + } + + $sth->execute(); + + ($all_sets, $local_sets) = $sth->fetchrow; + + if (($all_sets // 0) == ($local_sets // 0)) { + $run_master = true; + } + else { + $run_master = false; + } + } + else { + $run_master = true; + } + } + }; + warn ("ERROR: Failed reading slony node config\n") if $@; + + return $run_master; +} + +sub loadWork{ + my $dbhost = shift; + my $dbport = shift; + my $dbname = shift; + my $dbuser = shift; + my $dbschema = shift; + my $dbtable = shift; + my $node_role = shift; + my $target_dbname = shift; + my $dsn; + my $dbh; + my $sth; + my $query; + my $qw_schedname; + my @pronames; + + if ($node_role ne 'D') { + $dsn = "DBI:Pg:dbname=$dbname;host=$dbhost;port=$dbport;"; + eval { + $dbh = DBI->connect($dsn, $dbuser); + { + $dbh->do("SET application_name = 'pg_sched'"); + + $qw_schedname = $dbh->quote_identifier($dbschema) . '.' . $dbh->quote_identifier($dbtable); + + $query = "SELECT p.id, p.datname, p.pronamespace, p.proname, p.proargs, p.proargtypes, COALESCE(p.usename,current_user), ?::text, p.running FROM $qw_schedname p + WHERE p.datname = ? AND (p.enabled = 'A' OR p.enabled = ?) + AND (p.last_run IS NULL OR + (date_trunc('m', current_timestamp)-date_trunc('m',p.last_run))::interval >= p.frequency) + AND (p.isloose OR + (extract(EPOCH FROM date_trunc('m', current_timestamp-coalesce(frequency_offset,'0s'::interval)))::integer + %extract(EPOCH FROM frequency)::integer) = 0);"; + + $sth = $dbh->prepare($query); + $sth->bind_param(1, ($node_role?'O':'R')); + $sth->bind_param(2, $target_dbname); + $sth->bind_param(3, ($node_role?'O':'R')); + $sth->execute(); + + while (my @prodef = $sth->fetchrow) { + push(@pronames, \@prodef); + } + } + }; + warn ("ERROR: Loading work failed\n") if $@; + } + + return @pronames; +} + +sub doWork{ + my $pronames = shift; + my $dbhost = shift; + my $dbport = shift; + my $dbname = shift; + my $dbuser = shift; + my $dbschema = shift; + my $dbtable = shift; + my @workers; + my @worker_result; + my $bad = 0; + + foreach my $prodef (@$pronames) { + my ($t) = threads->new(\&runWorker, $prodef, $dbhost, $dbport, $dbname, $dbuser, $dbschema, $dbtable); + push(@workers,$t); + } + foreach (@workers) { + @worker_result = $_->join; + if ($worker_result[0] == true) { + print("$worker_result[1] [SUCCEEDED]\n"); + } + else { + print("$worker_result[1] [FAILED]\n"); + $bad++; + } + } + return $bad; +} + +sub runWorker{ + my $prodef = shift; + my $dbhost = shift; + my $dbport = shift; + my $dbname = shift; + my $dbuser = shift; + my $dbschema = shift; + my $dbtable = shift; + + my $dsn; + my $dbh; + my $sth; + my $query; + my $qw_schedname; + my @result; + my $success; + my ($g_year, $g_month, $g_day, $g_hour, $g_min, $g_sec) = (localtime(time))[5,4,3,2,1,0]; + my $timestamp = sprintf ("%02d/%02d/%04d %02d:%02d:%02d", $g_day, $g_month+1, $g_year+1900, $g_hour, $g_min, $g_sec); + my $detail = $timestamp . " Schedule: $dbschema.$dbtable Task: id#@$prodef[0] @$prodef[1].@$prodef[2].@$prodef[3](" . + (defined(@$prodef[4])?join(', ',@{@$prodef[4]}):'') . ") Rep Role: @$prodef[7] User: @$prodef[6] Result: "; + my $typindex = 0; + my $start; + my $end; + + if (!defined(@$prodef[8]) || !kill(0, @$prodef[8])) { + eval { + + eval { + $dsn = "DBI:Pg:dbname=$dbname;host=$dbhost;port=$dbport;"; + $dbh = DBI->connect($dsn, $dbuser); + $dbh->do("SET application_name = 'pg_sched'"); + + $qw_schedname = $dbh->quote_identifier($dbschema) . '.' . $dbh->quote_identifier($dbtable); + + $query = "UPDATE $qw_schedname SET running = ? WHERE id = ?;"; + $sth = $dbh->prepare($query); + $sth->bind_param(1, $$); + $sth->bind_param(2, @$prodef[0]); + $sth->execute(); + $sth->finish; + $dbh->disconnect(); + }; + if ($@) { + warn ("WARNING: pre update of schedule failed\n"); + } + + $dsn = "DBI:Pg:dbname=@$prodef[1];host=$dbhost;port=$dbport;"; + $dbh = DBI->connect($dsn, $dbuser); + $dbh->do("SET application_name = 'pg_sched'"); + + $sth = $dbh->prepare("SET session_authorization = ?"); + $sth->bind_param(1, @$prodef[6]); + $sth->execute(); + + $query = "SELECT " . $dbh->quote_identifier(@$prodef[2]) . '.' . $dbh->quote_identifier(@$prodef[3]) . '('; + if (defined(@$prodef[4])) { + foreach my $arg (@{@$prodef[4]}) { + #$query = $query . ($typindex>0?',':'') . $dbh->quote($arg) . '::' . @{@$prodef[5]}[$typindex]; + $query .= ($typindex>0?',':'') . '?::' . @{@$prodef[5]}[$typindex]; + $typindex++; + } + } + $query .= ');'; + + $sth = $dbh->prepare($query); + + $typindex = 0; + if (defined(@$prodef[4])) { + foreach my $arg (@{@$prodef[4]}) { + $typindex++; + $sth->bind_param($typindex, $arg); + } + } + $start = gettimeofday(); + $sth->execute(); + $end = gettimeofday(); + + while (my @result = $sth->fetchrow) { + $success = true; + $detail .= ($result[0] // 'NULL') . ' (Timing: ' . sprintf("%.2f sec", $end-$start) . ')'; + } + $sth->finish; + $dbh->disconnect(); + + eval { + $dsn = "DBI:Pg:dbname=$dbname;host=$dbhost;port=$dbport;"; + $dbh = DBI->connect($dsn, $dbuser); + $dbh->do("SET application_name = 'pg_sched'"); + + $qw_schedname = $dbh->quote_identifier($dbschema) . '.' . $dbh->quote_identifier($dbtable); + + $query = "UPDATE $qw_schedname SET running = NULL, last_run = ?::timestamp WHERE id = ?;"; + $sth = $dbh->prepare($query); + $sth->bind_param(1, $timestamp); + $sth->bind_param(2, @$prodef[0]); + $sth->execute(); + $sth->finish; + $dbh->disconnect(); + }; + if ($@) { + warn ("WARNING: post update of schedule failed\n"); + } + }; + if ($@) { + $success = false; + $detail = $@; + warn ("WARNING: worker execution failed\n"); + } + } + else { + $success = false; + $detail .= 'already running PID ' . @$prodef[8]; + } + + return ($success, $detail); +} + diff --git a/pg_sched.sql b/pg_sched.sql new file mode 100644 index 0000000..b8fda5c --- /dev/null +++ b/pg_sched.sql @@ -0,0 +1,56 @@ +SET search_path=public; + +DROP TYPE IF EXISTS node_role CASCADE; +CREATE TYPE node_role AS ENUM ('O', 'R', 'A', 'D'); + +DROP TABLE IF EXISTS pg_sched CASCADE; +CREATE TABLE pg_sched +( + id bigserial NOT NULL PRIMARY KEY, + datname text NOT NULL, + proname text NOT NULL, + pronamespace text NOT NULL, + proargs text[], + proargtypes text[], + usename text, + frequency interval NOT NULL, + frequency_offset interval NOT NULL DEFAULT '0s', + last_run timestamp, + enabled node_role NULL DEFAULT 'O', + isexclusive boolean NOT NULL DEFAULT true, + isloose boolean NOT NULL DEFAULT true, + tag varchar(50), + running integer, + CONSTRAINT pg_sched_unique UNIQUE (datname, proname, pronamespace, proargs, proargtypes, frequency, frequency_offset, enabled), + CHECK (array_length(proargs,1) IS NOT DISTINCT FROM array_length(proargtypes,1)) +); + +CREATE OR REPLACE FUNCTION pg_sched_check_types() RETURNS TRIGGER AS +$BODY$ +BEGIN + IF EXISTS(SELECT 1 FROM unnest(NEW.proargtypes) a + LEFT JOIN pg_catalog.pg_type + ON pg_catalog.format_type(oid, NULL) = a + OR typname = a WHERE typname IS NULL) THEN + RAISE EXCEPTION 'Value for column "proargtypes" contains invalid types: %', NEW.proargtypes; + END IF; + RETURN NEW; +END; +$BODY$ +LANGUAGE plpgsql; + +REVOKE ALL ON pg_sched FROM public; +GRANT SELECT ON pg_sched TO public; + +CREATE TRIGGER pg_sched_check_types_trigger +BEFORE UPDATE OR INSERT ON pg_sched +FOR EACH ROW WHEN (NEW.proargtypes IS NOT NULL) +EXECUTE PROCEDURE pg_sched_check_types(); + +-- Superuser is required to run tasks under differing credentials +-- CREATE USER pg_sched WITH PASSWORD 'my password' SUPERUSER ; +-- ALTER TABLE pg_sched OWNER TO pg_sched; + +-- Example task +-- INSERT INTO pg_sched (usename, datname, pronamespace, proname, proargs, proargtypes, enabled, frequency, frequency_offset) +-- VALUES ('test_user', 'mydb', 'pg_catalog', 'date_part', '{"hour", "2015-03-25 13:50:59"}', '{text, timestamp}', 'A', '1 hour', '1 minute'); -- 2.39.5