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| | # -*- encoding: binary -*-
# frozen_string_literal: true
# \MogileFS administration client, this has little real-world usage
# and is considered a work-in-progress
class MogileFS::Admin < MogileFS::Client
##
# Enumerates fids using #list_fids. Returns the number of valid fids
# processed
def each_fid
low = -1
rv = 0
begin
fids = list_fids(low)
fids.each { |fid| yield fid }
rv += fids.size
end while last = fids[-1] and low = last["fid"]
rv
end
##
# Returns an Array of host status Hashes. If +hostid+ is given only that
# host is returned.
#
# admin.get_hosts 1
#
# Returns:
#
# [{"status"=>"alive",
# "http_get_port"=>nil,
# "http_port"=>7500,
# "hostid"=>1,
# "hostip"=>"192.168.1.2",
# "hostname"=>"rur-1",
# "altip"=>"",
# "altmask"=>""}]
def get_hosts(hostid = nil)
to_i = %w(hostid http_port http_get_port)
want = %w(status hostip hostname altip altmask).concat(to_i)
rv = @backend.get_hosts(hostid ? { :hostid => hostid } : {})
clean('hosts', 'host', rv, true, to_i, want)
end
##
# Returns an Array of device status Hashes. If devid is given only that
# device is returned.
#
# admin.get_devices 1
#
# Returns:
#
# [{"status"=>"alive",
# "mb_asof"=>nil,
# "mb_free"=>666000,
# "devid"=>1,
# "hostid"=>1,
# "mb_used"=>666,
# "utilization"=>0.0,
# "reject_bad_md5"=>false,
# "observed_state"=>"writeable",
# "mb_total"=>666666}]
def get_devices(devid = nil)
to_i = %w(mb_asof mb_free mb_used mb_total devid weight hostid)
want = %w(status reject_bad_md5 observed_state utilization).concat(to_i)
rv = @backend.get_devices(devid ? { :devid => devid } : {})
rv = clean('devices', 'dev', rv, true, to_i, want)
rv.each do |row|
u = row["utilization"] and row["utilization"] = u.to_f
case row["observed_state"]
when ""
row["observed_state"] = nil
end
# be sure we do not set this at all for pre-2.60 MogileFS-Server
case row["reject_bad_md5"]
when "1"
row["reject_bad_md5"] = true
when "0"
row["reject_bad_md5"] = false
when ""
row["reject_bad_md5"] = nil
end
end
end
##
# Returns an Array of fid Hashes from +from_fid+, limited to +count+
#
# admin.list_fids 0, 100
#
# Returns:
#
# [{"fid"=>99,
# "class"=>"normal",
# "domain"=>"test",
# "devcount"=>2,
# "length"=>4,
# "key"=>"file_key"},
# {"fid"=>82,
# "class"=>"normal",
# "devcount"=>2,
# "domain"=>"test",
# "length"=>9,
# "key"=>"new_new_key"}]
def list_fids(from_fid, count = 100)
to_i = %w(fid devcount length)
want = %w(domain class key).concat(to_i)
rv = @backend.list_fids(:from => from_fid, :to => count)
# :to is now :count internally in mogilefsd
clean('fid_count', 'fid_', rv, true, to_i, want)
end
##
# Returns a statistics structure representing the state of mogilefs.
#
# *** This command no longer works with recent versions of MogileFS ***
# *** Use mogstats(1) from the MogileFS::Utils package on CPAN ***
# *** We will remove this method in 4.x ***
#
# admin.get_stats
#
# Returns:
#
# {"fids"=>{"max"=>"99", "count"=>"2"},
# "device"=>
# [{"status"=>"alive", "files"=>"2", "id"=>"1", "host"=>"rur-1"},
# {"status"=>"alive", "files"=>"2", "id"=>"2", "host"=>"rur-2"}],
# "replication"=>
# [{"files"=>"2", "class"=>"normal", "devcount"=>"2", "domain"=>"test"}],
# "file"=>[{"files"=>"2", "class"=>"normal", "domain"=>"test"}]}
def get_stats(type = 'all')
res = @backend.stats type => 1
stats = {}
stats['device'] = clean 'devicescount', 'devices', res, false
stats['file'] = clean 'filescount', 'files', res, false
stats['replication'] = clean 'replicationcount', 'replication', res, false
if res['fidmax'] or res['fidcount'] then
stats['fids'] = {
'max' => res['fidmax'].to_i,
'count' => res['fidcount'].to_i
}
end
%w(device file replication).each do |s|
stats.delete(s) if stats[s].empty?
end
stats
end
##
# Returns the domains and classes, and their policies present in the mogilefs.
#
# admin.get_domains
#
# Returns (on newer MogileFS servers):
# {
# "test" => {
# "default" => {
# "mindevcount" => 2,
# "replpolicy" => "MultipleHosts()",
# "hashtype => nil,
# }
# }
# }
#
# Returns (on older MogileFS servers without replication policies):
#
# {"test"=>{"normal"=>3, "default"=>2}}
def get_domains
res = @backend.get_domains
have_replpolicy = false
domains = {}
to_i = %w(mindevcount)
want = %w(name replpolicy hashtype mindevcount)
(1..res['domains'].to_i).each do |i|
domain = clean("domain#{i}classes", "domain#{i}class", res, false, to_i,
want)
tmp = domains[res["domain#{i}"]] = {}
domain.each do |d|
tmp[d.delete("name")] = d
have_replpolicy ||= d.include?("replpolicy")
end
end
# only for MogileFS 1.x?, maybe we can drop support for this...
unless have_replpolicy
domains.each do |namespace, class_data|
class_data.each do |class_name, data|
class_data[class_name] = data["mindevcount"]
end
end
end
domains
end
##
# Creates a new domain named +domain+. Returns nil if creation failed.
def create_domain(domain)
raise MogileFS::ReadOnlyError if readonly?
res = @backend.create_domain :domain => domain
res ? res['domain'] : nil
end
##
# Deletes +domain+. Returns true if successful, raises
# MogileFS::Backend::DomainNotFoundError if not
def delete_domain(domain)
raise MogileFS::ReadOnlyError if readonly?
! @backend.delete_domain(:domain => domain).nil?
end
##
# Creates a new class in +domain+ named +klass+ with +policy+ for
# replication. Raises on failure.
def create_class(domain, klass, policy)
modify_class(domain, klass, policy, :create)
end
##
# Updates class +klass+ in +domain+ with +policy+ for replication.
# Raises on failure.
def update_class(domain, klass, policy)
modify_class(domain, klass, policy, :update)
end
##
# Removes class +klass+ from +domain+. Returns true if successful.
# Raises on failure
def delete_class(domain, klass)
! @backend.delete_class(:domain => domain, :class => klass).nil?
end
##
# Creates a new host named +host+. +args+ must contain :ip and :port.
# Returns true if successful, false if not.
def create_host(host, args = {})
raise ArgumentError, "Must specify ip and port" unless \
args.include? :ip and args.include? :port
modify_host(host, args, 'create')
end
##
# Updates +host+ with +args+. Returns true if successful, false if not.
def update_host(host, args = {})
modify_host(host, args, 'update')
end
##
# Deletes host +host+. Returns nil on failure.
def delete_host(host)
raise MogileFS::ReadOnlyError if readonly?
! @backend.delete_host(:host => host).nil?
end
##
# Creates device with Integer +devid+ on +host+
# +host+ may be an integer for hostid or String for hostname
def create_device(host, devid, opts = {})
raise MogileFS::ReadOnlyError if readonly?
opts = opts.dup
case host
when Integer
opts[:hostid] = host
when String
opts[:hostname] = host
else
raise ArgumentError, "host=#{host.inspect} is not a String or Integer"
end
opts[:devid] = devid
! @backend.create_device(opts).nil?
end
##
# Changes the device status of +device+ on +host+ to +state+ which can be
# 'alive', 'down', or 'dead'.
def change_device_state(host, device, state)
raise MogileFS::ReadOnlyError if readonly?
! @backend.set_state(:host => host, :device => device, :state => state).nil?
end
##
# Changes the device weight of +device+ on +host+ to +weight+.
# +weight+ should be a non-negative Integer. Devices with higher
# +weight+ values are more likely to be chosen for reads and writes.
def change_device_weight(host, device, weight)
raise MogileFS::ReadOnlyError if readonly?
opts = { :host => host, :device => device, :weight => weight }
! @backend.set_weight(opts).nil?
end
# reschedules all deferred replication, returns a hash with the number
# of files rescheduled:
#
# admin.replicate_now => { "count" => 5 }
def replicate_now
rv = @backend.replicate_now
rv["count"] = rv["count"].to_i
rv
end
# Clears the tracker caches. Not implemented in all versions of MogileFS
def clear_cache
@backend.clear_cache
end
protected unless defined? $TESTING
##
# Modifies +klass+ on +domain+ to store files on +mindevcount+ devices via
# +action+. Returns the class name if successful, raises if not
def modify_class(domain, klass, policy, action)
raise MogileFS::ReadOnlyError if readonly?
args = { :domain => domain, :class => klass }
case policy
when Integer
args[:mindevcount] = policy
when String
args[:replpolicy] = policy
when Hash
args.merge!(policy)
else
raise ArgumentError,
"policy=#{policy.inspect} not understood for #{action}_class"
end
@backend.__send__("#{action}_class", args)["class"]
end
##
# Modifies +host+ using +args+ via +action+. Returns true if successful,
# false if not.
def modify_host(host, args = {}, action = 'create')
args[:host] = host
! @backend.__send__("#{action}_host", args).nil?
end
##
# Turns the response +res+ from the backend into an Array of Hashes from 1
# to res[+count+]. If +underscore+ is true then a '_' character is assumed
# between the prefix and the hash key value.
#
# res = {"host1_remoteroot"=>"/mnt/mogilefs/rur-1",
# "host1_hostname"=>"rur-1",
# "host1_hostid"=>"1",
# "host1_http_get_port"=>"",
# "host1_altip"=>"",
# "hosts"=>"1",
# "host1_hostip"=>"",
# "host1_http_port"=>"",
# "host1_status"=>"alive",
# "host1_altmask"=>""}
# admin.clean 'hosts', 'host', res
#
# Returns:
#
# [{"status"=>"alive",
# "http_get_port"=>nil,
# "http_port"=>7600,
# "hostid"=>1,
# "hostip"=>"192.168.1.3",
# "hostname"=>"rur-1",
# "altip"=>"",
# "altmask"=>""}]
def clean(count, prefix, res, underscore = true, to_i = [], want = nil)
empty = ""
underscore = underscore ? '_' : empty
# convert array to hash for O(1) lookups
to_i = to_i.inject({}) { |m,k| m[k] = m }
if want
(1..res[count].to_i).map do |i|
row = {}
want.each do |k|
v = res["#{prefix}#{i}#{underscore}#{k}"] or next
row[k] = to_i.include?(k) ? (empty == v ? nil : v.to_i) : v
end
row
end
else
keys = res.keys
(1..res[count].to_i).map do |i|
re = /^#{prefix}#{i}#{underscore}/
row = {}
keys.grep(re).each do |k|
v = res[k]
k = k.sub(re, empty)
row[k] = to_i.include?(k) ? (empty == v ? nil : v.to_i) : v
end
row
end
end
end
end
|