mirror of
https://github.com/tahoe-lafs/tahoe-lafs.git
synced 2024-12-24 23:26:43 +00:00
b06c74c2a1
These allow client-side code to conveniently retrieve the IDirectoryNode instances for both the global shared public root directory, and the per-user private root directory.
78 lines
3.1 KiB
Plaintext
78 lines
3.1 KiB
Plaintext
|
|
CODE OVERVIEW
|
|
|
|
A brief map to where the code lives in this distribution:
|
|
|
|
src/zfec: the erasure-coding library, turns data into shares and back again.
|
|
When installed, this provides the 'zfec' package.
|
|
|
|
src/Crypto: a modified version of PyCrypto, which includes a patch to
|
|
greatly improve the speed of CTR mode, which unfortunately makes
|
|
it incompatible with the normal version of PyCrypto. When
|
|
installed, this provides the 'allmydata.Crypto' package.
|
|
|
|
src/allmydata: the bulk of the code for this project. When installed, this
|
|
provides the 'allmydata' package
|
|
|
|
Within src/allmydata/ :
|
|
|
|
interfaces.py: declaration of zope.interface-style Interfaces for most
|
|
components, also defines Foolscap RemoteInterfaces for
|
|
all remotely-accessible components
|
|
|
|
node.py: the base Node, which handles connection establishment and
|
|
application startup
|
|
|
|
client.py, introducer_and_vdrive.py:
|
|
these are two specialized subclasses of Node, for users and the central
|
|
introducer/vdrive handler, respectively. Each works by assembling a
|
|
collection of services underneath a top-level Node instance.
|
|
|
|
introducer.py: node introduction handlers, client is used by client.py,
|
|
server is used by introducer_and_vdrive.py
|
|
|
|
storageserver.py: provides storage services to other nodes
|
|
|
|
codec.py: low-level erasure coding, wraps zfec
|
|
|
|
encode.py: handles turning data into shares and blocks, computes hash trees
|
|
upload.py: upload-side peer selection, reading data from upload sources
|
|
|
|
download.py: download-side peer selection, share retrieval, decoding
|
|
|
|
dirnode.py: implements the directory nodes. One part runs on the
|
|
global vdrive server, the other runs inside a client
|
|
(starting with vdrive.py)
|
|
|
|
vdrive.py: provides a client-side service that accesses the global
|
|
shared virtual drive and the per-user private drive.
|
|
|
|
webish.py, web/*.xhtml: provides the web frontend, using a Nevow server
|
|
|
|
uri.py: URI packing/parsing routines
|
|
|
|
hashtree.py: Merkle hash tree classes
|
|
|
|
debugshell.py, manhole.py: SSH-connected python shell, for debug purposes
|
|
|
|
util/*.py: misc utility classes
|
|
|
|
test/*.py: unit tests
|
|
|
|
|
|
Both the client and the central introducer-and-vdrive node runs as a tree of
|
|
(twisted.application.service) Service instances. The Foolscap "Tub" is one of
|
|
these. Client nodes have an Uploader service and a Downloader service that
|
|
turn data into URIs and back again. They also have a VirtualDrive service
|
|
which provides access to the single global shared filesystem.
|
|
|
|
The Uploader is given an "upload source" (which could be an open filehandle,
|
|
a filename on local disk, or even a string), and returns a Deferred that
|
|
fires with the URI once the upload is complete. The Downloader is given a URI
|
|
and a "download target" (an open filehandle, filename, or instructions to
|
|
provide a string), and fires a Deferred with a target-specific value when the
|
|
download is complete. The source/target API is intended to make it easy to
|
|
stream the incoming data to a media player or HTTP connection without having
|
|
to consume a lot of memory for buffering.
|
|
|