module MockRedis::ListMethods
Public Instance Methods
blpop(*args)
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# File lib/mock_redis/list_methods.rb, line 9 def blpop(*args) lists, timeout = extract_timeout(args) nonempty_list = first_nonempty_list(lists) if nonempty_list [nonempty_list, lpop(nonempty_list)] elsif timeout > 0 nil else raise MockRedis::WouldBlock, "Can't block forever" end end
brpop(*args)
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# File lib/mock_redis/list_methods.rb, line 22 def brpop(*args) lists, timeout = extract_timeout(args) nonempty_list = first_nonempty_list(lists) if nonempty_list [nonempty_list, rpop(nonempty_list)] elsif timeout > 0 nil else raise MockRedis::WouldBlock, "Can't block forever" end end
brpoplpush(source, destination, options = {})
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# File lib/mock_redis/list_methods.rb, line 35 def brpoplpush(source, destination, options = {}) options = { :timeout => options } if options.is_a?(Integer) timeout = options.is_a?(Hash) && options[:timeout] || 0 assert_valid_timeout(timeout) if llen(source) > 0 rpoplpush(source, destination) elsif timeout > 0 nil else raise MockRedis::WouldBlock, "Can't block forever" end end
lindex(key, index)
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# File lib/mock_redis/list_methods.rb, line 49 def lindex(key, index) with_list_at(key) { |l| l[index.to_i] } end
linsert(key, position, pivot, value)
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# File lib/mock_redis/list_methods.rb, line 53 def linsert(key, position, pivot, value) unless %w[before after].include?(position.to_s) raise Redis::CommandError, 'ERR syntax error' end assert_listy(key) return 0 unless data[key] pivot_position = (0..llen(key) - 1).find do |i| data[key][i] == pivot.to_s end return -1 unless pivot_position insertion_index = if position.to_s == 'before' pivot_position else pivot_position + 1 end data[key].insert(insertion_index, value.to_s) llen(key) end
llen(key)
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# File lib/mock_redis/list_methods.rb, line 77 def llen(key) with_list_at(key, &:length) end
lpop(key)
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# File lib/mock_redis/list_methods.rb, line 81 def lpop(key) with_list_at(key, &:shift) end
lpush(key, values)
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# File lib/mock_redis/list_methods.rb, line 85 def lpush(key, values) values = [values] unless values.is_a?(Array) assert_has_args(values, 'lpush') with_list_at(key) { |l| values.each { |v| l.unshift(v.to_s) } } llen(key) end
lpushx(key, value)
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# File lib/mock_redis/list_methods.rb, line 92 def lpushx(key, value) value = [value] unless value.is_a?(Array) if value.empty? raise Redis::CommandError, "ERR wrong number of arguments for 'lpushx' command" end assert_listy(key) return 0 unless list_at?(key) lpush(key, value) end
lrange(key, start, stop)
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# File lib/mock_redis/list_methods.rb, line 102 def lrange(key, start, stop) start = start.to_i with_list_at(key) { |l| start < l.size ? l[[start, -l.length].max..stop.to_i] : [] } end
lrem(key, count, value)
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# File lib/mock_redis/list_methods.rb, line 107 def lrem(key, count, value) unless looks_like_integer?(count.to_s) raise Redis::CommandError, 'ERR value is not an integer or out of range' end count = count.to_i value = value.to_s with_list_at(key) do |list| indices_with_value = (0..(llen(key) - 1)).find_all do |i| list[i] == value end indices_to_delete = if count == 0 indices_with_value.reverse elsif count > 0 indices_with_value.take(count).reverse else indices_with_value.reverse.take(-count) end indices_to_delete.each { |i| list.delete_at(i) }.length end end
lset(key, index, value)
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# File lib/mock_redis/list_methods.rb, line 131 def lset(key, index, value) assert_listy(key) unless list_at?(key) raise Redis::CommandError, 'ERR no such key' end index = index.to_i unless (0...llen(key)).cover?(index) raise Redis::CommandError, 'ERR index out of range' end data[key][index] = value.to_s 'OK' end
ltrim(key, start, stop)
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# File lib/mock_redis/list_methods.rb, line 147 def ltrim(key, start, stop) with_list_at(key) do |list| list&.replace(list[[start.to_i, -list.length].max..stop.to_i] || []) 'OK' end end
rpop(key)
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# File lib/mock_redis/list_methods.rb, line 154 def rpop(key) with_list_at(key) { |list| list&.pop } end
rpoplpush(source, destination)
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# File lib/mock_redis/list_methods.rb, line 158 def rpoplpush(source, destination) value = rpop(source) lpush(destination, value) unless value.nil? value end
rpush(key, values)
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# File lib/mock_redis/list_methods.rb, line 164 def rpush(key, values) values = [values] unless values.is_a?(Array) assert_has_args(values, 'rpush') with_list_at(key) { |l| values.each { |v| l.push(v.to_s) } } llen(key) end
rpushx(key, value)
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# File lib/mock_redis/list_methods.rb, line 171 def rpushx(key, value) value = [value] unless value.is_a?(Array) if value.empty? raise Redis::CommandError, "ERR wrong number of arguments for 'rpushx' command" end assert_listy(key) return 0 unless list_at?(key) rpush(key, value) end
Private Instance Methods
assert_listy(key)
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# File lib/mock_redis/list_methods.rb, line 195 def assert_listy(key) unless listy?(key) # Not the most helpful error, but it's what redis-rb barfs up raise Redis::CommandError, 'WRONGTYPE Operation against a key holding the wrong kind of value' end end
first_nonempty_list(keys)
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# File lib/mock_redis/list_methods.rb, line 203 def first_nonempty_list(keys) keys.find { |k| llen(k) > 0 } end
list_at?(key)
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# File lib/mock_redis/list_methods.rb, line 183 def list_at?(key) data[key] && listy?(key) end
listy?(key)
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# File lib/mock_redis/list_methods.rb, line 191 def listy?(key) data[key].nil? || data[key].is_a?(Array) end
with_list_at(key, &blk)
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# File lib/mock_redis/list_methods.rb, line 187 def with_list_at(key, &blk) with_thing_at(key, :assert_listy, proc { [] }, &blk) end