Graham Ollis π > Yars > Yars::Tools

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Module Version: 1.22   Source  

NAME ^

Yars::Tools - various utility functions dealing with servers, hosts, etc

VERSION ^

version 1.22

DESCRIPTION ^

This module is largely used internally by Yars. Documentation for some of its capabilities are provided here for the understanding of how the rest of the Yars server works, but they should not be considered to be a public interface and they may change in the future, though probably not for a good reason.

FUNCTIONS ^

new

Create a new instance of Yars::Tools

refresh_config

Refresh the configuration data cached in memory.

disk_for

Given an md5 digest, calculate the root directory of this file. Undef is returned if this file does not belong on the current host.

local_buckets

Get a hash from disk to list of buckets for this server.

disk_is_up

Given a disk root, return true unless the disk is marked down. A disk is down if the state file indicates it, or if it exists but is unwriteable.

disk_is_up_verified

This is the same as disk_is_up, but doesn't trust the operating system, and tries to write a file to the disk's temp directory and verify that the file is not of zero size.

disk_is_down

Disk is not up.

disk_is_local

Return true if the disk is on this server.

server_is_up, server_is_down

Check to see if a remote server is up or down.

mark_disk_down, mark_disk_up

Mark a disk as up or down.

server_for

Given an md5, return the url for the server for this file.

bucket_map

Return a map from bucket prefix to server url.

storage_path

Calculate the directory of an md5 on disk. Optionally pass a second parameter to force it onto a particular disk.

remote_stashed_server

Find a server which is stashing this file, if one exists. Parameters : $c - controller $filename - filename $digest - digest

local_stashed_dir

Find a local directory stashing this file, if one exists. Parameters : $filename - filename $digest - digest Returns : The directory or false.

server_exists

Does this server exist?

server_url

Returns the url of the current server.

disk_roots

Return all the local directory roots, in a random order.

server_urls

Return all the other urls, in a random order.

cleanup_tree

Given a directory, traverse upwards until encountering a local disk root or a non-empty directory, and remove all empty directories.

count_files

Count the number of files in a directory tree.

human_size

Given a size, format it like df -kh

content_is_same

Given a filename and an Asset, return true if the content is the same for both.

hex2b64, b642hex

Convert from hex to base 64.

SEE ALSO ^

Yars, Yars::Client

AUTHOR ^

Original author: Marty Brandon

Current maintainer: Graham Ollis <plicease@cpan.org>

Contributors:

Brian Duggan

Curt Tilmes

COPYRIGHT AND LICENSE ^

This software is copyright (c) 2013 by NASA GSFC.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

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