Module: MockRedis::StringMethods

Includes:
Assertions
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 7

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

#decr(key) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 14

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

#decrby(key, n) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 18

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

#get(key) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 22

def get(key)
  assert_stringy(key)
  data[key]
end

#getbit(key, offset) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 27

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 43

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 48

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 54

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

#incrby(key, n) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 58

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

  unless looks_like_integer?(n.to_s)
    raise RuntimeError, "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

#mget(*keys) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 74

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

  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 82

def mset(*kvpairs)
  assert_has_args(kvpairs, 'mset')
  if kvpairs.length.odd?
    raise RuntimeError, "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 95

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

  if kvpairs.each_slice(2).any? {|(k,v)| exists(k)}
    0
  else
    mset(*kvpairs)
    1
  end
end

#set(key, value) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 106

def set(key, value)
  data[key] = value.to_s
  'OK'
end

#setbit(key, offset, value) ⇒ Object 



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# File 'lib/mock_redis/string_methods.rb', line 111

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
  char_as_number |=
    (2**((char.bytesize * 8)-1) >>
    (offset_within_char * 8 + offset_within_byte))
  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 149

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 155

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 164

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 174

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