Look into <a href="http://datr.ws">http://datr.ws</a> also.<br>-E<br><br><div><span class="gmail_quote">On 5/2/07, <b class="gmail_sendername"><a href="mailto:zooko@zooko.com">zooko@zooko.com</a></b> <<a href="mailto:zooko@zooko.com">
zooko@zooko.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>Dear p2p-hackers:<br><br>Allmydata, Inc. [1], provider of the "Allmydata" consumer backup product, is
<br>pleased to announce the first public release of "Tahoe", a secure,<br>distributed storage grid with a free-software licence.<br><br>The source code that we are releasing is the current working prototype for<br>
Allmydata's next-generation product. This release is targeted at hackers who<br>are willing to use a minimal, text-oriented web user interface.<br><br>This prototype is not recommended for storage of confidential data nor for
<br>data which is not otherwise backed up, but it already implements a functional<br>distributed storage grid and is useful for experimentation, prototyping, and<br>extension.<br><br><br>LICENCE<br><br>Tahoe is offered under the GNU General Public License (v2 or later), with the
<br>added permission that, if you become obligated to release a derived work<br>under this licence (as per section 2.b), you may delay the fulfillment of<br>this obligation for up to 12 months.<br><br><br>INSTALLATION<br>
<br>This release of Tahoe works and passes all unit tests on Linux/x86,<br>Linux/amd64, Mac/Intel, Mac/PPC, Windows-native, and Cygwin.<br><br>To install, download the tarball [2], untar it, go into the resulting<br>directory, and follow the directions in the README [3].
<br><br><br>USAGE<br><br>Once installed, create a "client node". Instruct this client node to connect<br>to a specific "introducer node" by means of config files in the client node's<br>working directory. To join a public grid, copy in the .furl files for that
<br>grid. To create a private grid, run your own introducer, and copy its .furl<br>files. See the README for step-by-step instructions.<br><br>Each client node runs a local webserver (enabled by writing the desired port
<br>number into a file called 'webport'). The front page of this webserver shows<br>the node's status, including which introducer is being used and which other<br>nodes are connected. Links from the status page lead to others that give
<br>access to a shared virtual filesystem, in which each directory is represented<br>by a separate page. Each directory page shows a list of the files available<br>there, with download links, and forms to upload new files.
<br><br>Other ways to access the filesystem are planned, as well as other structures<br>than the single globally-shared namespace implemented by this release: please<br>see the roadmap.txt [5] for some rough details.<br><br>
<br>HACKING AND COMMUNITY<br><br>Please join the mailing list [4] to discuss the ideas behind Tahoe and<br>extensions of and uses of Tahoe. Patches that extend and improve Tahoe are<br>gratefully accepted -- roadmap.txt shows the next improvements that we plan
<br>to make. You can browse the revision control history, source code, and issue<br>tracking at the Trac instance [6]. Please see the buildbot [7], which shows<br>how Tahoe builds and passes unit tests on each checkin, and the code coverage
<br>results [8] and percentage-covered graph [9], which show how much of the<br>Tahoe source code is currently exercised by the test suite.<br><br><br>NETWORK ARCHITECTURE<br><br>Each peer maintains a connection to each other peer. A single distinct
<br>server called an "introducer" is used to discover other peers with which to<br>connect.<br><br>To store a file, the file is encrypted and erasure coded, and each resulting<br>share is uploaded to a different peer. The secure hash of the encrypted file
<br>and the encryption key are packed into a URI, knowledge of which is necessary<br>and sufficient to recover the file.<br><br>To fetch a file, starting with the URI, a subset of shares is downloaded from<br>peers, the file is reconstructed from the shares, and then decrypted.
<br><br>A single distinct server called a "vdrive server" maintains a global mapping<br>from pathnames/filenames to URIs.<br><br>We are well aware of the limitations of decentralization and scalability<br>inherent in this prototype. In particular, the completely-connected property
<br>of the grid and the requirement of a single distinct introducer and vdrive<br>server limits the possible size of the grid. We have plans to loosen these<br>limitations (see roadmap.txt). Currently it should be noted that the grid
<br>already depends as little as possible on the accessibility and correctness of<br>the introduction server and the vdrive server. Also note that the choice of<br>which servers to use is easily configured -- you should be able to set up a
<br>private grid for you and your friends almost as easily as to connect to our<br>public test grid.<br><br><br>SOFTWARE ARCHITECTURE<br><br>Tahoe is a "from the ground-up" rewrite, inspired by Allmydata's existing
<br>consumer backup service. It is primarily written in Python.<br><br>Tahoe is based on the Foolscap library [10] which provides a remote object<br>protocol inspired by the capability-secure "E" programming language [11].
<br>Foolscap allows us to express the intended behavior of the distributed grid<br>directly in object-oriented terms while relying on a well-engineered, secure<br>transport layer.<br><br>The underlying networking is provided by the Twisted library [12].
<br>Computationally intensive operations are performed in native compiled code,<br>such as the "zfec" library for fast erasure coding (also available<br>separately: [13]).<br><br><br>[1] <a href="http://allmydata.com">
http://allmydata.com</a><br>[2] <a href="http://allmydata.org/source/tahoe/tahoe-0.2.0-0-UNSTABLE.tar.gz">http://allmydata.org/source/tahoe/tahoe-0.2.0-0-UNSTABLE.tar.gz</a><br>[3] <a href="http://allmydata.org/trac/tahoe/browser/README">
http://allmydata.org/trac/tahoe/browser/README</a><br>[4] <a href="http://allmydata.org/cgi-bin/mailman/listinfo/tahoe-dev">http://allmydata.org/cgi-bin/mailman/listinfo/tahoe-dev</a><br>[5] <a href="http://allmydata.org/trac/tahoe/browser/roadmap.txt">
http://allmydata.org/trac/tahoe/browser/roadmap.txt</a><br>[6] <a href="http://allmydata.org/trac/tahoe">http://allmydata.org/trac/tahoe</a><br>[7] <a href="http://allmydata.org/buildbot">http://allmydata.org/buildbot</a>
<br>[8] <a href="http://allmydata.org/tahoe-figleaf/figleaf/">http://allmydata.org/tahoe-figleaf/figleaf/</a><br>[9] <a href="http://allmydata.org/tahoe-figleaf-graph/hanford.allmydata.com-tahoe_figleaf.html">http://allmydata.org/tahoe-figleaf-graph/hanford.allmydata.com-tahoe_figleaf.html
</a><br>[10] <a href="http://twistedmatrix.com/trac/wiki/FoolsCap">http://twistedmatrix.com/trac/wiki/FoolsCap</a><br>[11] <a href="http://erights.org/">http://erights.org/</a><br>[12] <a href="http://twistedmatrix.com/">
http://twistedmatrix.com/</a><br>[13] <a href="http://allmydata.org/trac/tahoe/browser/src/zfec">http://allmydata.org/trac/tahoe/browser/src/zfec</a><br>_______________________________________________<br>p2p-hackers mailing list
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<br><br clear="all"><br>-- <br>Thanks in advance and best regards,<br><br>Ed <br>Mail: edpimentl[at]gmail.com<br>Mail2: edpimentl[at]ieee.org<br>IM: edpimentl [AOL | Jabber | Yahoo | MSN ]<br>Voip: edpimentl [SKype | GoogleTalk ]
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