/
zset_methods.rb
368 lines (313 loc) · 9.99 KB
/
zset_methods.rb
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require 'mock_redis/assertions'
require 'mock_redis/utility_methods'
require 'mock_redis/zset'
class MockRedis
module ZsetMethods
include Assertions
include UtilityMethods
def zadd(key, *args)
zadd_options = {}
zadd_options = args.pop if args.last.is_a?(Hash)
if zadd_options&.include?(:nx) && zadd_options&.include?(:xx)
raise Redis::CommandError, 'ERR XX and NX options at the same time are not compatible'
end
if args.size == 1 && args[0].is_a?(Array)
zadd_multiple_members(key, args.first, zadd_options)
elsif args.size == 2
score, member = args
zadd_one_member(key, score, member, zadd_options)
else
raise Redis::CommandError, 'ERR wrong number of arguments'
end
end
def zadd_one_member(key, score, member, zadd_options = {})
assert_scorey(score) unless score.to_s =~ /(\+|\-)inf/
with_zset_at(key) do |zset|
if zadd_options[:incr]
if zadd_options[:xx]
member_present = zset.include?(member)
return member_present ? zincrby(key, score, member) : nil
end
if zadd_options[:nx]
member_present = zset.include?(member)
return member_present ? nil : zincrby(key, score, member)
end
zincrby(key, score, member)
elsif zadd_options[:xx]
zset.add(score, member.to_s) if zset.include?(member)
false
elsif zadd_options[:nx]
!zset.include?(member) && !!zset.add(score, member.to_s)
else
retval = !zscore(key, member)
zset.add(score, member.to_s)
retval
end
end
end
private :zadd_one_member
def zadd_multiple_members(key, args, zadd_options = {})
assert_has_args(args, 'zadd')
args = args.each_slice(2).to_a unless args.first.is_a?(Array)
with_zset_at(key) do |zset|
if zadd_options[:incr]
raise Redis::CommandError, 'ERR INCR option supports a single increment-element pair'
elsif zadd_options[:xx]
args.each { |score, member| zset.include?(member) && zset.add(score, member.to_s) }
0
elsif zadd_options[:nx]
args.reduce(0) do |retval, (score, member)|
unless zset.include?(member)
zset.add(score, member.to_s)
retval += 1
end
retval
end
else
args.reduce(0) do |retval, (score, member)|
retval += 1 unless zset.include?(member)
zset.add(score, member.to_s)
retval
end
end
end
end
private :zadd_multiple_members
def zcard(key)
with_zset_at(key, &:size)
end
def zcount(key, min, max)
assert_range_args(min, max)
with_zset_at(key) do |zset|
zset.in_range(min, max).size
end
end
def zincrby(key, increment, member)
assert_scorey(increment)
member = member.to_s
with_zset_at(key) do |z|
old_score = z.include?(member) ? z.score(member) : 0
new_score = old_score + increment
z.add(new_score, member)
new_score.to_f
end
end
def zinterstore(destination, keys, options = {})
assert_has_args(keys, 'zinterstore')
data[destination] = combine_weighted_zsets(keys, options, :intersection)
zcard(destination)
end
def zrange(key, start, stop, options = {})
with_zset_at(key) do |z|
start = [start.to_i, -z.sorted.size].max
stop = stop.to_i
to_response(z.sorted[start..stop] || [], options)
end
end
def zrangebyscore(key, min, max, options = {})
assert_range_args(min, max)
with_zset_at(key) do |zset|
all_results = zset.in_range(min, max)
to_response(apply_limit(all_results, options[:limit]), options)
end
end
def zrank(key, member)
with_zset_at(key) { |z| z.sorted_members.index(member.to_s) }
end
def zrem(key, *args)
if !args.first.is_a?(Array)
retval = with_zset_at(key) { |z| !!z.delete?(args.first.to_s) }
else
args = args.first
if args.empty?
raise Redis::CommandError, "ERR wrong number of arguments for 'zrem' command"
else
retval = args.map { |member| !!zscore(key, member.to_s) }.count(true)
with_zset_at(key) do |z|
args.each { |member| z.delete?(member) }
end
end
end
retval
end
def zpopmin(key, count = 1)
with_zset_at(key) do |z|
pairs = z.sorted.first(count)
pairs.each { |pair| z.delete?(pair.last) }
retval = to_response(pairs, with_scores: true)
count == 1 ? retval.first : retval
end
end
def zpopmax(key, count = 1)
with_zset_at(key) do |z|
pairs = z.sorted.reverse.first(count)
pairs.each { |pair| z.delete?(pair.last) }
retval = to_response(pairs, with_scores: true)
count == 1 ? retval.first : retval
end
end
def zrevrange(key, start, stop, options = {})
with_zset_at(key) do |z|
to_response(z.sorted.reverse[start..stop] || [], options)
end
end
def zremrangebyrank(key, start, stop)
zrange(key, start, stop).
each { |member| zrem(key, member) }.
size
end
def zremrangebyscore(key, min, max)
assert_range_args(min, max)
zrangebyscore(key, min, max).
each { |member| zrem(key, member) }.
size
end
def zrevrangebyscore(key, max, min, options = {})
assert_range_args(min, max)
with_zset_at(key) do |zset|
to_response(
apply_limit(
zset.in_range(min, max).reverse,
options[:limit]
),
options
)
end
end
def zrevrank(key, member)
with_zset_at(key) { |z| z.sorted_members.reverse.index(member.to_s) }
end
def zscan(key, cursor, opts = {})
opts = opts.merge(key: lambda { |x| x[0] })
common_scan(zrange(key, 0, -1, withscores: true), cursor, opts)
end
def zscan_each(key, opts = {}, &block)
return to_enum(:zscan_each, key, opts) unless block_given?
cursor = 0
loop do
cursor, values = zscan(key, cursor, opts)
values.each(&block)
break if cursor == '0'
end
end
def zscore(key, member)
with_zset_at(key) do |z|
score = z.score(member.to_s)
score&.to_f
end
end
def zunionstore(destination, keys, options = {})
assert_has_args(keys, 'zunionstore')
data[destination] = combine_weighted_zsets(keys, options, :union)
zcard(destination)
end
private
def apply_limit(collection, limit)
if limit
if limit.is_a?(Array) && limit.length == 2
offset, count = limit
collection.drop(offset).take(count)
else
raise Redis::CommandError, 'ERR syntax error'
end
else
collection
end
end
def to_response(score_member_pairs, options)
score_member_pairs.map do |(score, member)|
if options[:with_scores] || options[:withscores]
[member, score.to_f]
else
member
end
end
end
def combine_weighted_zsets(keys, options, how)
weights = options.fetch(:weights, keys.map { 1 })
if weights.length != keys.length
raise Redis::CommandError, 'ERR syntax error'
end
aggregator = case options.fetch(:aggregate, :sum).to_s.downcase.to_sym
when :sum
proc { |a, b| [a, b].compact.reduce(&:+) }
when :min
proc { |a, b| [a, b].compact.min }
when :max
proc { |a, b| [a, b].compact.max }
else
raise Redis::CommandError, 'ERR syntax error'
end
with_zsets_at(*keys, coercible: true) do |*zsets|
zsets.zip(weights).map do |(zset, weight)|
zset.reduce(Zset.new) do |acc, (score, member)|
acc.add(score * weight, member)
end
end.reduce do |za, zb|
za.send(how, zb, &aggregator)
end
end
end
def coerce_to_zset(set)
zset = Zset.new
set.each do |member|
zset.add(1.0, member)
end
zset
end
def with_zset_at(key, coercible: false, &blk)
if coercible
with_thing_at(key, :assert_coercible_zsety, proc { Zset.new }) do |value|
blk.call value.is_a?(Set) ? coerce_to_zset(value) : value
end
else
with_thing_at(key, :assert_zsety, proc { Zset.new }, &blk)
end
end
def with_zsets_at(*keys, coercible: false, &blk)
if keys.length == 1
with_zset_at(keys.first, coercible: coercible, &blk)
else
with_zset_at(keys.first, coercible: coercible) do |set|
with_zsets_at(*(keys[1..-1]), coercible: coercible) do |*sets|
yield(*([set] + sets))
end
end
end
end
def zsety?(key)
data[key].nil? || data[key].is_a?(Zset)
end
def coercible_zsety?(key)
zsety?(key) || data[key].is_a?(Set)
end
def assert_zsety(key)
unless zsety?(key)
raise Redis::CommandError,
'WRONGTYPE Operation against a key holding the wrong kind of value'
end
end
def assert_coercible_zsety(key)
unless coercible_zsety?(key)
raise Redis::CommandError,
'WRONGTYPE Operation against a key holding the wrong kind of value'
end
end
def looks_like_float?(x)
# ugh, exceptions for flow control.
!!Float(x) rescue false
end
def assert_scorey(value, message = 'ERR value is not a valid float')
return if value.to_s =~ /\(?(\-|\+)inf/
value = $1 if value.to_s =~ /\((.*)/
unless looks_like_float?(value)
raise Redis::CommandError, message
end
end
def assert_range_args(min, max)
[min, max].each do |value|
assert_scorey(value, 'ERR min or max is not a float')
end
end
end
end