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/
commands.rb
589 lines (527 loc) · 17.9 KB
/
commands.rb
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require "pp"
require "digest/md5"
module Gizzard
class Command
include Thrift
attr_reader :buffer
def self.run(command_name, global_options, argv, subcommand_options, log, service=nil)
command_class = Gizzard.const_get("#{classify(command_name)}Command")
service = command_class.make_service(global_options, log) if service.nil?
command = command_class.new(service, global_options, argv, subcommand_options)
command.run
if command.buffer && command_name = global_options.render.shift
run(command_name, global_options, command.buffer, OpenStruct.new, log, service)
end
end
def self.classify(string)
string.split(/\W+/).map{|s| s.capitalize }.join("")
end
attr_reader :service, :global_options, :argv, :command_options
def initialize(service, global_options, argv, command_options)
@service = service
@global_options = global_options
@argv = argv
@command_options = command_options
end
def help!(message = nil)
raise HelpNeededError, message
end
def output(string)
if global_options.render.any?
@buffer ||= []
@buffer << string.strip
else
puts string
end
end
end
class ShardCommand < Command
def self.make_service(global_options, log)
Gizzard::Thrift::ShardManager.new(global_options.host, global_options.port, log, global_options.dry)
end
end
class JobCommand < Command
def self.make_service(global_options, log)
Gizzard::Thrift::JobManager.new(global_options.host, global_options.port + 2, log, global_options.dry)
end
end
class AddforwardingCommand < ShardCommand
def run
help! if argv.length != 3
table_id, base_id, shard_id_text = argv
shard_id = ShardId.parse(shard_id_text)
service.set_forwarding(Forwarding.new(table_id.to_i, base_id.to_i, shard_id))
end
end
class DeleteforwardingCommand < ShardCommand
def run
help! if argv.length != 3
table_id, base_id, shard_id_text = argv
shard_id = ShardId.parse(shard_id_text)
service.remove_forwarding(Forwarding.new(table_id.to_i, base_id.to_i, shard_id))
end
end
class HostsCommand < ShardCommand
def run
service.list_hostnames.map do |host|
puts host
end
end
end
class ForwardingsCommand < ShardCommand
def run
service.get_forwardings().sort_by do |f|
[ ((f.table_id.abs << 1) + (f.table_id < 0 ? 1 : 0)), f.base_id ]
end.reject do |forwarding|
@command_options.table_ids && !@command_options.table_ids.include?(forwarding.table_id)
end.each do |forwarding|
output [ forwarding.table_id, @command_options.hex ? ("%016x" % forwarding.base_id) : forwarding.base_id, forwarding.shard_id.to_unix ].join("\t")
end
end
end
class SubtreeCommand < ShardCommand
def run
@roots = []
argv.each do |arg|
@id = ShardId.parse(arg)
@roots += roots_of(@id)
end
@roots.uniq.each do |root|
output root.to_unix
down(root, 1)
end
end
def roots_of(id)
links = service.list_upward_links(id)
if links.empty?
[id]
else
links.map { |link| roots_of(link.up_id) }.flatten
end
end
def down(id, depth = 0)
service.list_downward_links(id).map do |link|
printable = " " * depth + link.down_id.to_unix
output printable
down(link.down_id, depth + 1)
end
end
end
class ReloadCommand < ShardCommand
def run
if global_options.force || ask
service.reload_forwardings
else
STDERR.puts "aborted"
end
end
def ask
output "Are you sure? Reloading will affect production services immediately! (Type 'yes')"
gets.chomp == "yes"
end
end
class DeleteCommand < ShardCommand
def run
argv.each do |arg|
id = ShardId.parse(arg)
service.delete_shard(id)
output id.to_unix
end
end
end
class AddlinkCommand < ShardCommand
def run
up_id, down_id, weight = argv
help! if argv.length != 3
weight = weight.to_i
up_id = ShardId.parse(up_id)
down_id = ShardId.parse(down_id)
link = LinkInfo.new(up_id, down_id, weight)
service.add_link(link.up_id, link.down_id, link.weight)
output link.to_unix
end
end
class UnlinkCommand < ShardCommand
def run
up_id, down_id = argv
up_id = ShardId.parse(up_id)
down_id = ShardId.parse(down_id)
service.remove_link(up_id, down_id)
end
end
class UnwrapCommand < ShardCommand
def run
shard_ids = argv
help! "No shards specified" if shard_ids.empty?
shard_ids.each do |shard_id_string|
shard_id = ShardId.parse(shard_id_string)
service.list_upward_links(shard_id).each do |uplink|
service.list_downward_links(shard_id).each do |downlink|
service.add_link(uplink.up_id, downlink.down_id, uplink.weight)
new_link = LinkInfo.new(uplink.up_id, downlink.down_id, uplink.weight)
service.remove_link(uplink.up_id, uplink.down_id)
service.remove_link(downlink.up_id, downlink.down_id)
output new_link.to_unix
end
end
service.delete_shard shard_id
end
end
end
class CreateCommand < ShardCommand
def run
help! if argv.length < 2
class_name, *shard_ids = argv
busy = 0
source_type = command_options.source_type || ""
destination_type = command_options.destination_type || ""
shard_ids.each do |id|
shard_id = ShardId.parse(id)
service.create_shard(ShardInfo.new(shard_id, class_name, source_type, destination_type, busy))
service.get_shard(shard_id)
output shard_id.to_unix
end
end
end
class LinksCommand < ShardCommand
def run
shard_ids = @argv
shard_ids.each do |shard_id_text|
shard_id = ShardId.parse(shard_id_text)
service.list_upward_links(shard_id).each do |link_info|
output link_info.to_unix
end
service.list_downward_links(shard_id).each do |link_info|
output link_info.to_unix
end
end
end
end
class InfoCommand < ShardCommand
def run
shard_ids = @argv
shard_ids.each do |shard_id|
shard_info = service.get_shard(ShardId.parse(shard_id))
output shard_info.to_unix
end
end
end
class RepairCommand < ShardCommand
def run
args = @argv.dup.map{|a| a.split(/\s+/)}.flatten
pairs = []
loop do
a = args.shift
b = args.shift
break unless a && b
pairs << [a, b]
end
pairs.each do |master, slave|
puts "#{master} #{slave}"
mprefixes = service.shards_for_hostname(master).map{|s| s.id.table_prefix}
sprefixes = service.shards_for_hostname(slave).map{|s| s.id.table_prefix}
delta = mprefixes - sprefixes
delta.each do |prefix|
puts "gizzmo copy #{master}/#{prefix} #{slave}/#{prefix}"
end
end
end
end
class WrapCommand < ShardCommand
def self.derive_wrapper_shard_id(shard_info, wrapping_class_name)
suffix = "_" + wrapping_class_name.split(".").last.downcase.gsub("shard", "")
ShardId.new("localhost", shard_info.id.table_prefix + suffix)
end
def run
class_name, *shard_ids = @argv
help! "No shards specified" if shard_ids.empty?
shard_ids.each do |shard_id_string|
shard_id = ShardId.parse(shard_id_string)
shard_info = service.get_shard(shard_id)
service.create_shard(ShardInfo.new(wrapper_id = self.class.derive_wrapper_shard_id(shard_info, class_name), class_name, "", "", 0))
existing_links = service.list_upward_links(shard_id)
unless existing_links.include?(LinkInfo.new(wrapper_id, shard_id, 1))
service.add_link(wrapper_id, shard_id, 1)
existing_links.each do |link_info|
service.add_link(link_info.up_id, wrapper_id, link_info.weight)
service.remove_link(link_info.up_id, link_info.down_id)
end
end
output wrapper_id.to_unix
end
end
end
class RebalanceCommand < ShardCommand
class NamedArray < Array
attr_reader :name
def initialize(name)
@name = name
end
end
def run
help! "No shards specified" if @argv.empty?
shards = []
command_options.write_only_shard ||= "com.twitter.gizzard.shards.WriteOnlyShard"
additional_hosts = (command_options.hosts || "").split(/[\s,]+/)
ids = @argv.map{|arg| ShardId.new(*arg.split("/")) rescue nil }.compact
by_host = ids.inject({}) do |memo, id|
memo[id.hostname] ||= NamedArray.new(id.hostname)
memo[id.hostname] << id
memo
end
additional_hosts.each do |host|
by_host[host] ||= NamedArray.new(host)
end
sets = by_host.values
begin
sorted = sets.sort_by{|s| s.length }
longest = sorted.last
shortest = sorted.first
shortest.push longest.pop
end while longest.length > shortest.length + 1
shard_info = nil
sets.each do |set|
host = set.name
set.each do |id|
if id.hostname != host
shard_info ||= service.get_shard(id)
old = id.to_unix
id.hostname = host
shards << [old, id.to_unix]
end
end
end
new_shards = shards.map{|(old, new)| new }
puts "gizzmo create #{shard_info.class_name} -s '#{shard_info.source_type}' -d '#{shard_info.destination_type}' #{new_shards.join(" ")}"
puts "gizzmo wrap #{command_options.write_only_shard} #{new_shards.join(" ")}"
shards.map {|(old, new)| puts "gizzmo copy #{old} #{new}" }
end
end
class PairCommand < ShardCommand
def run
ids = []
@argv.map do |host|
service.shards_for_hostname(host).each do |shard|
ids << shard.id
end
end
ids_by_table = {}
ids.map do |id|
ids_by_table[id.table_prefix] ||= []
ids_by_table[id.table_prefix] << id
end
ids_by_host = {}
ids.map do |id|
ids_by_host[id.hostname] ||= []
ids_by_host[id.hostname] << id
end
overlaps = {}
ids_by_table.values.each do |arr|
key = arr.map{|id| id.hostname }.sort
overlaps[key] ||= 0
overlaps[key] += 1
end
displayed = {}
overlaps.sort_by{|hosts, count| count }.reverse.each do |(host_a, host_b), count|
next if !host_a || !host_b || displayed[host_a] || displayed[host_b]
id_a = ids_by_host[host_a].find{|id| service.list_upward_links(id).size > 0 }
id_b = ids_by_host[host_b].find{|id| service.list_upward_links(id).size > 0 }
next unless id_a && id_b
weight_a = service.list_upward_links(id_a).first.weight
weight_b = service.list_upward_links(id_b).first.weight
if weight_a > weight_b
puts "#{host_a}\t#{host_b}"
else
puts "#{host_b}\t#{host_a}"
end
displayed[host_a] = true
displayed[host_b] = true
end
remaining = @argv - displayed.keys
loop do
a = remaining.shift
b = remaining.shift
break unless a && b
puts "#{a}\t#{b}"
end
end
end
class ReportCommand < ShardCommand
def run
things = @argv.map do |shard|
parse(down(ShardId.parse(shard))).join("\n")
end
group(things).each do |string, things|
puts "=== " + sign(string) + ": #{things.length}" + " ===================="
puts string
end
end
def sign(string)
::Digest::MD5.hexdigest(string)[0..10]
end
def group(arr)
arr.inject({}) do |m, e|
m[e] ||= []
m[e] << e
m
end.to_a.sort_by{|k, v| v.length}.reverse
end
def parse(obj, id = nil, depth = 0, sub = true)
case obj
when Hash
id, prefix = parse(obj.keys.first, id, depth, sub)
[prefix] + parse(obj.values.first, id, depth + 1, sub)
when String
host, prefix = obj.split("/")
host = "db" if host != "localhost" && sub
id ||= prefix[/\w+ward_\d+_\d+/]
prefix = (" " * depth) + host + "/" + (sub ? prefix.sub(id, "[ID]") : prefix)
[id, prefix]
when Array
obj.map do |e|
parse e, id, depth, sub
end
end
end
def down(id)
vals = service.list_downward_links(id).map do |link|
down(link.down_id)
end
{id.to_unix => vals}
end
end
class DrillCommand < ReportCommand
def run
signature = @argv.shift
@argv.map do |shard|
if sign(parse(down(ShardId.parse(shard))).join("\n")) == signature
puts parse(down(ShardId.parse(shard)), nil, 0, false).join("\n")
end
end
end
end
class FindCommand < ShardCommand
def run
hosts = @argv << command_options.shard_host
hosts.compact.each do |host|
service.shards_for_hostname(host).each do |shard|
next if command_options.shard_type && shard.class_name !~ Regexp.new(command_options.shard_type)
output shard.id.to_unix
end
end
end
end
class LookupCommand < ShardCommand
def run
table_id, source = @argv
help!("Requires table id and source") unless table_id && source
case @command_options.hash_function
when :fnv
source_id = Digest.fnv1a_64(source)
else
source_id = source.to_i
end
shard = service.find_current_forwarding(table_id.to_i, source_id)
output shard.id.to_unix
end
end
class CopyCommand < ShardCommand
def run
from_shard_id_string, to_shard_id_string = @argv
help!("Requires source & destination shard id") unless from_shard_id_string && to_shard_id_string
from_shard_id = ShardId.parse(from_shard_id_string)
to_shard_id = ShardId.parse(to_shard_id_string)
service.copy_shard(from_shard_id, to_shard_id)
end
end
class BusyCommand < ShardCommand
def run
service.get_busy_shards().each { |shard_info| output shard_info.to_unix }
end
end
class SetupMigrateCommand < ShardCommand
def run
from_shard_id_string, to_shard_id_string = @argv
help!("Requires source & destination shard id") unless from_shard_id_string && to_shard_id_string
from_shard_id = ShardId.parse(from_shard_id_string)
to_shard_id = ShardId.parse(to_shard_id_string)
if service.list_upward_links(to_shard_id).size > 0
STDERR.puts "Destination shard #{to_shard_id} has links to it."
exit 1
end
write_only_shard_id = ShardId.new("localhost", "#{to_shard_id.table_prefix}_migrate_write_only")
replica_shard_id = ShardId.new("localhost", "#{to_shard_id.table_prefix}_migrate_replica")
service.create_shard(ShardInfo.new(write_only_shard_id, "com.twitter.gizzard.shards.WriteOnlyShard", "", "", 0))
service.create_shard(ShardInfo.new(replica_shard_id, "com.twitter.gizzard.shards.ReplicatingShard", "", "", 0))
service.add_link(write_only_shard_id, to_shard_id, 1)
service.list_upward_links(from_shard_id).each do |link|
service.remove_link(link.up_id, link.down_id)
service.add_link(link.up_id, replica_shard_id, link.weight)
end
service.add_link(replica_shard_id, from_shard_id, 1)
service.add_link(replica_shard_id, write_only_shard_id, 0)
service.replace_forwarding(from_shard_id, replica_shard_id)
output replica_shard_id.to_unix
end
end
class FinishMigrateCommand < ShardCommand
def run
from_shard_id_string, to_shard_id_string = @argv
help!("Requires source & destination shard id") unless from_shard_id_string && to_shard_id_string
from_shard_id = ShardId.parse(from_shard_id_string)
to_shard_id = ShardId.parse(to_shard_id_string)
write_only_shard_id = ShardId.new("localhost", "#{to_shard_id.table_prefix}_migrate_write_only")
replica_shard_id = ShardId.new("localhost", "#{to_shard_id.table_prefix}_migrate_replica")
# careful. need to validate some basic assumptions.
unless global_options.force
if service.list_upward_links(from_shard_id).map { |link| link.up_id }.to_a != [ replica_shard_id ]
STDERR.puts "Uplink from #{from_shard_id} is not a migration replica."
exit 1
end
if service.list_upward_links(to_shard_id).map { |link| link.up_id }.to_a != [ write_only_shard_id ]
STDERR.puts "Uplink from #{to_shard_id} is not a write-only barrier."
exit 1
end
if service.list_upward_links(write_only_shard_id).map { |link| link.up_id }.to_a != [ replica_shard_id ]
STDERR.puts "Uplink from write-only barrier is not a migration replica."
exit 1
end
end
service.remove_link(write_only_shard_id, to_shard_id)
service.list_upward_links(replica_shard_id).each do |link|
service.remove_link(link.up_id, link.down_id)
service.add_link(link.up_id, to_shard_id, link.weight)
end
service.replace_forwarding(replica_shard_id, to_shard_id)
service.delete_shard(replica_shard_id)
service.delete_shard(write_only_shard_id)
end
end
class InjectCommand < JobCommand
def run
priority, *jobs = @argv
help!("Requires priority") unless priority and jobs.size > 0
count = 0
jobs.each do |job|
service.inject_job(priority.to_i, job)
count += 1
# FIXME add -q --quiet option
STDERR.print "."
STDERR.print "#{count}" if count % 100 == 0
STDERR.flush
end
STDERR.print "\n"
end
end
class FlushCommand < JobCommand
def run
args = @argv[0]
help!("Requires --all, or a job priority id.") unless args || command_options.flush_all
if command_options.flush_all
service.retry_errors()
else
service.retry_errors_for(args.to_i)
end
end
end
end