Module: MockRedis::StringMethods

Includes:
Assertions, UtilityMethods
Included in:
Database
Defined in:
lib/mock_redis/string_methods.rb

Instance Method Summary collapse

Instance Method Details

#append(key, value) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 8

def append(key, value)
  assert_stringy(key)
  data[key] ||= ''
  data[key] << value
  data[key].length
end

#bitcount(key, start = 0, stop = -1)) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 281

def bitcount(key, start = 0, stop = -1)
  assert_stringy(key)

  str   = data[key] || ''
  count = 0
  m1    = 0x5555555555555555
  m2    = 0x3333333333333333
  m4    = 0x0f0f0f0f0f0f0f0f
  m8    = 0x00ff00ff00ff00ff
  m16   = 0x0000ffff0000ffff
  m32   = 0x00000000ffffffff

  str.bytes.to_a[start..stop].each do |byte|
    # Naive Hamming weight
    c = byte
    c = (c & m1) + ((c >> 1) & m1)
    c = (c & m2) + ((c >> 2) & m2)
    c = (c & m4) + ((c >> 4) & m4)
    c = (c & m8) + ((c >> 8) & m8)
    c = (c & m16) + ((c >> 16) & m16)
    c = (c & m32) + ((c >> 32) & m32)
    count += c
  end

  count
end

#bitfield(*args) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 15

def bitfield(*args)
  if args.length < 4
    raise Redis::CommandError, 'ERR wrong number of arguments for BITFIELD'
  end

  key = args.shift
  output = []
  overflow_method = 'wrap'

  until args.empty?
    command = args.shift.to_s

    if command == 'overflow'
      new_overflow_method = args.shift.to_s.downcase

      unless %w[wrap sat fail].include? new_overflow_method
        raise Redis::CommandError, 'ERR Invalid OVERFLOW type specified'
      end

      overflow_method = new_overflow_method
      next
    end

    type, offset = args.shift(2)

    is_signed = type.slice(0) == 'i'
    type_size = type[1..-1].to_i

    if (type_size > 64 && is_signed) || (type_size >= 64 && !is_signed)
      raise Redis::CommandError,
        'ERR Invalid bitfield type. Use something like i16 u8. ' \
        'Note that u64 is not supported but i64 is.'
    end

    if offset.to_s[0] == '#'
      offset = offset[1..-1].to_i * type_size
    end

    bits = []

    type_size.times do |i|
      bits.push(getbit(key, offset + i))
    end

    val = is_signed ? twos_complement_decode(bits) : bits.join('').to_i(2)

    case command
    when 'get'
      output.push(val)
    when 'set'
      output.push(val)

      set_bitfield(key, args.shift.to_i, is_signed, type_size, offset)
    when 'incrby'
      new_val = incr_bitfield(val, args.shift.to_i, is_signed, type_size, overflow_method)

      set_bitfield(key, new_val, is_signed, type_size, offset) if new_val
      output.push(new_val)
    end
  end

  output
end

#decr(key) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 79

def decr(key)
  decrby(key, 1)
end

#decrby(key, n) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 83

def decrby(key, n)
  incrby(key, -n)
end

#get(key) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 87

def get(key)
  key = key.to_s
  assert_stringy(key)
  data[key]
end

#getbit(key, offset) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 93

def getbit(key, offset)
  assert_stringy(key)

  offset_of_byte = offset / 8
  offset_within_byte = offset % 8

  # String#getbyte would be lovely, but it's not in 1.8.7.
  byte = (data[key] || '').each_byte.drop(offset_of_byte).first

  if byte
    (byte & (2**7 >> offset_within_byte)) > 0 ? 1 : 0
  else
    0
  end
end

#getrange(key, start, stop) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 109

def getrange(key, start, stop)
  assert_stringy(key)
  (data[key] || '')[start..stop]
end

#getset(key, value) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 114

def getset(key, value)
  retval = get(key)
  set(key, value)
  retval
end

#incr(key) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 120

def incr(key)
  incrby(key, 1)
end

#incrby(key, n) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 124

def incrby(key, n)
  assert_stringy(key)
  unless can_incr?(data[key])
    raise Redis::CommandError, 'ERR value is not an integer or out of range'
  end

  unless looks_like_integer?(n.to_s)
    raise Redis::CommandError, 'ERR value is not an integer or out of range'
  end

  new_value = data[key].to_i + n.to_i
  data[key] = new_value.to_s
  # for some reason, redis-rb doesn't return this as a string.
  new_value
end

#incrbyfloat(key, n) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 140

def incrbyfloat(key, n)
  assert_stringy(key)
  unless can_incr_float?(data[key])
    raise Redis::CommandError, 'ERR value is not a valid float'
  end

  unless looks_like_float?(n.to_s)
    raise Redis::CommandError, 'ERR value is not a valid float'
  end

  new_value = data[key].to_f + n.to_f
  data[key] = new_value.to_s
  # for some reason, redis-rb doesn't return this as a string.
  new_value
end

#mapped_mget(*keys) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 165

def mapped_mget(*keys)
  Hash[keys.zip(mget(*keys))]
end

#mapped_mset(hash) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 184

def mapped_mset(hash)
  mset(*hash.to_a.flatten)
end

#mapped_msetnx(hash) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 199

def mapped_msetnx(hash)
  msetnx(*hash.to_a.flatten)
end

#mget(*keys) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 156

def mget(*keys)
  assert_has_args(keys, 'mget')

  keys.flatten!
  keys.map do |key|
    get(key) if stringy?(key)
  end
end

#mset(*kvpairs) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 169

def mset(*kvpairs)
  assert_has_args(kvpairs, 'mset')
  kvpairs = kvpairs.first if kvpairs.size == 1 && kvpairs.first.is_a?(Enumerable)

  if kvpairs.length.odd?
    raise Redis::CommandError, 'ERR wrong number of arguments for MSET'
  end

  kvpairs.each_slice(2) do |(k, v)|
    set(k, v)
  end

  'OK'
end

#msetnx(*kvpairs) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 188

def msetnx(*kvpairs)
  assert_has_args(kvpairs, 'msetnx')

  if kvpairs.each_slice(2).any? { |(k, _)| exists(k) }
    false
  else
    mset(*kvpairs)
    true
  end
end

#set(key, value, options = {}) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 203

def set(key, value, options = {})
  key = key.to_s
  return_true = false
  options = options.dup
  if options.delete(:nx)
    if exists(key)
      return false
    else
      return_true = true
    end
  end
  if options.delete(:xx)
    if exists(key)
      return_true = true
    else
      return false
    end
  end
  data[key] = value.to_s

  # take latter
  expire_option = options.to_a.last
  if expire_option
    type, duration = expire_option
    if duration == 0
      raise Redis::CommandError, 'ERR invalid expire time in set'
    end
    expire(key, type.to_sym == :ex ? duration : duration / 1000.0)
  end
  return_true ? true : 'OK'
end

#setbit(key, offset, value) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 235

def setbit(key, offset, value)
  assert_stringy(key, 'ERR bit is not an integer or out of range')
  retval = getbit(key, offset)

  str = data[key] || ''

  offset_of_byte = offset / 8
  offset_within_byte = offset % 8

  if offset_of_byte >= str.bytesize
    str = zero_pad(str, offset_of_byte + 1)
  end

  char_index = byte_index = offset_within_char = 0
  str.each_char do |c|
    if byte_index < offset_of_byte
      char_index += 1
      byte_index += c.bytesize
    else
      offset_within_char = byte_index - offset_of_byte
      break
    end
  end

  char = str[char_index]
  char = char.chr if char.respond_to?(:chr) # ruby 1.8 vs 1.9
  char_as_number = char.each_byte.reduce(0) do |a, byte|
    (a << 8) + byte
  end

  bitmask_length = (char.bytesize * 8 - offset_within_char * 8 - offset_within_byte - 1)
  bitmask = 1 << bitmask_length

  if value.zero?
    bitmask ^= 2**(char.bytesize * 8) - 1
    char_as_number &= bitmask
  else
    char_as_number |= bitmask
  end

  str[char_index] = char_as_number.chr

  data[key] = str
  retval
end

#setex(key, seconds, value) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 308

def setex(key, seconds, value)
  set(key, value)
  expire(key, seconds)
  'OK'
end

#setnx(key, value) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 314

def setnx(key, value)
  if exists(key)
    false
  else
    set(key, value)
    true
  end
end

#setrange(key, offset, value) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 323

def setrange(key, offset, value)
  assert_stringy(key)
  value = value.to_s
  old_value = (data[key] || '')

  prefix = zero_pad(old_value[0...offset], offset)
  data[key] = prefix + value + (old_value[(offset + value.length)..-1] || '')
  data[key].length
end

#strlen(key) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 333

def strlen(key)
  assert_stringy(key)
  (data[key] || '').bytesize
end