Class: TokyoCacheCow::Server

Inherits:
EventMachine::Protocols::LineAndTextProtocol
  • Object
show all
Defined in:
lib/tokyo_cache_cow/server.rb

Constant Summary collapse

DefaultPort = 
11211
Terminator = 
"\r\n"
SetCommand =

set

/(\S+) +(\d+) +(\d+) +(\d+)( +noreply)?/
CasCommand = 
/(\S+) +(\d+) +(\d+) +(\d+) +(\d+)( +noreply)?/
StoredReply = 
"STORED\r\n"
NotStoredReply = 
"NOT_STORED\r\n"
ExistsReply = 
"EXISTS\r\n"
NotFoundReply = 
"NOT_FOUND\r\n"
GetValueReply = 
"VALUE %s %d %d\r\n"
CasValueReply = 
"VALUE %d %d %d %d\r\n"
EndReply = 
"END\r\n"
DeleteCommand =

delete

/(\S+) *(noreply)?/
DeleteWithTimeoutCommand = 
/(\S+) +(\d+) *(noreply)?/
DeletedReply = 
"DELETED\r\n"
NotDeletedReply = 
"NOT_DELETED\r\n"
DeleteMatchCommand =

delete_match

/(\S+)( +noreply)?/
IncrementDecrementCommand =

Increment/Decrement

/(\S+) +(\d+)( +noreply)?/
ValueReply = 
"%d\r\n"
OK =

errors

"OK\r\n"
Error = 
"ERROR\r\n"
ClientError = 
"CLIENT_ERROR %s\r\n"
ServerError = 
"SERVER_ERROR %s\r\n"
TerminatorRegex = 
/\r\n/

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#cache ⇒ Object

Returns the value of attribute cache.



47
48
49
 
# File 'lib/tokyo_cache_cow/server.rb', line 47

def cache
  @cache
end

#special_match_char ⇒ Object

Returns the value of attribute special_match_char.



47
48
49
 
# File 'lib/tokyo_cache_cow/server.rb', line 47

def special_match_char
  @special_match_char
end

Instance Method Details

#receive_data(data) ⇒ Object 



86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
 
# File 'lib/tokyo_cache_cow/server.rb', line 86

def receive_data(data)
  if @body
    @body << data
    return if @body.size < @expected_size
  end
  
  ss = StringScanner.new(@body || data)
  
  while part = ss.scan_until(TerminatorRegex)
    begin
      command_argument_separator_index = part.index(/\s/)
      command = part[0, command_argument_separator_index]
      args = part[command_argument_separator_index + 1, part.size - command_argument_separator_index - 3]
      case command
      when 'get', 'gets'
        keys = args.split(/\s+/)
        keys.each do |k|
          next unless validate_key(k)
          if special_match_char && k.index(special_match_char) == 0
            k.slice!(0, special_match_char.size)
            value = @cache.get_match_list(k)
            send_data(GetValueReply % [k, "0", value.size])
            send_data(value)
            send_data(Terminator)
          elsif k =~ /^(avg|sum|count|min|max)\((.*?)\)$/
            value = @cache.send(:"#{$1}_match", $2).to_s
            send_data(GetValueReply % [k, "0", value.size])
            send_data(value)
            send_data(Terminator)
          else
            if data = @cache.get(k)
              if command == 'get'
                send_data(GetValueReply % [k, data[:flags], data[:value].size])
              else
                send_data(CasValueReply % [k, data[:flags], data[:value].size, data[:value].hash])
              end
              send_data(data[:value])
              send_data(Terminator)
            end
          end
          
        end
        send_data(EndReply)
      when 'set'
        SetCommand.match(args) or (send_client_error and next)
        (key, flags, expires, bytes, noreply) = [$1, Integer($2), Integer($3), Integer($4), !$5.nil?]
        next unless validate_key(key)
        return if set_incomplete(ss, bytes, part)
        send_data(@cache.set(key, ss.rest[0, bytes.to_i], :flags => flags, :expires => expires) ?
          StoredReply : NotStoredReply)
        @body = nil
        ss.pos += bytes + 2 
      when 'add'
        SetCommand.match(args)
        (key, flags, expires, bytes, noreply) = [$1, $2.to_i, $3.to_i, $4, !$5.nil?]
        return if set_incomplete(ss, bytes, part)
        send_data(@cache.add(key, ss.rest[0, bytes.to_i], :flags => flags, :expires => expires) ?
          StoredReply : NotStoredReply)
        @body = nil
        ss.pos += bytes + 2 
      when 'replace'
        SetCommand.match(args)
        (key, flags, expires, bytes, noreply) = [$1, $2.to_i, $3.to_i, $4, !$5.nil?]
        return if set_incomplete(ss, bytes, part)
        send_data(@cache.replace(key, ss.rest[0, bytes.to_i], :flags => flags, :expires => expires) ?
          StoredReply : NotStoredReply)
        @body = nil
        ss.pos += bytes + 2 
      when 'append'
        SetCommand.match(args)
        (key, flags, expires, bytes, noreply) = [$1, $2.to_i, $3.to_i, $4, !$5.nil?]
        return if set_incomplete(ss, bytes, part)
        send_data(@cache.append(key, ss.rest[0, bytes.to_i], :flags => flags, :expires => expires) ?
          StoredReply : NotStoredReply)
        @body = nil
        ss.pos += bytes + 2 
      when 'prepend'
        SetCommand.match(args)
        (key, flags, expires, bytes, noreply) = [$1, $2.to_i, $3.to_i, $4, !$5.nil?]
        return if set_incomplete(ss, bytes, part)
        send_data(@cache.prepend(key, ss.rest[0, bytes.to_i], :flags => flags, :expires => expires) ?
          StoredReply : NotStoredReply)
        @body = nil
        ss.pos += bytes + 2 
      when 'cas'
        # do something
      when 'delete'
        split_args = args.split(/\s+/)
        (key, timeout, noreply) = case split_args.size
        when 2
          [split_args[0].chomp, 0, !split_args[1].nil?]
        when 3
          [split_args[0].chomp, split_args[1].to_i, !split_args[2].nil?]
        else
          (send_client_error and next)
        end
        next unless validate_key(key)
        if special_match_char && key.index(special_match_char) == 0
          key.slice!(0,special_match_char.size)
          @cache.delete_match(key)
          send_data(DeletedReply)
        elsif timeout == 0
          send_data @cache.delete(key) ?
            DeletedReply : NotDeletedReply
        else
          send_data(@cache.delete(key, :expires => timeout) ?
            DeletedReply : NotDeletedReply)
        end
      when 'delete_match'
        DeleteMatchCommand.match(args)
        (key, noreply) = [$1.chomp, !$2.nil?]
        next unless validate_key(key)
        @cache.delete_match(key)
        send_data(DeletedReply)
      when 'incr', 'decr'
        IncrementDecrementCommand.match(args)
        (key, value, noreply) = [$1, $2.to_i, !$3.nil?]
        next unless validate_key(key)
        send_data(if d = @cache.get(key)
          value = -value if command == 'decr'
          d['data'] = (val = (d['data'].to_i + value)).to_s
          @cache.put(key, d)
          ValueReply % val
        else
          NotFoundReply
        end)
      when 'stats'
        send_data(Error)
      when 'flush_all'
        send_data(@cache.flush_all ? OK : Error)
      when 'version'
        send_data(Error)
      when 'quit'
        close_connection_after_writing
      else
        send_data(Error)
      end
    rescue
      puts $!
      puts $!.backtrace
      send_server_error($!)
    end
  end
  
end

#send_client_error(message = "invalid arguments") ⇒ Object 



49
50
51
 
# File 'lib/tokyo_cache_cow/server.rb', line 49

def send_client_error(message = "invalid arguments")
  send_data(ClientError % message.to_s)
end

#send_server_error(message = "there was a problem") ⇒ Object 



53
54
55
 
# File 'lib/tokyo_cache_cow/server.rb', line 53

def send_server_error(message = "there was a problem")
  send_data(ServerError % message.to_s)
end

#set_incomplete(ss, length, part) ⇒ Object 



71
72
73
74
75
76
77
78
79
80
81
82
83
84
 
# File 'lib/tokyo_cache_cow/server.rb', line 71

def set_incomplete(ss, length, part)
  if ss.rest.size < length
    @expected_size = length + ss.pre_match.size + 2
    if @body
      @body << ss.string
    else
      @body = part
      @body << ss.rest
    end
    true
  else
    false
  end
end

#validate_key(key) ⇒ Object 



57
58
59
60
61
62
63
64
65
66
67
68
69
 
# File 'lib/tokyo_cache_cow/server.rb', line 57

def validate_key(key)
  if key.nil?
    send_data(ClientError % "key cannot be blank")
  elsif key && key.index(' ')
    send_data(ClientError % "key cannot contain spaces")
    nil
  elsif key.size > 250
    send_data(ClientError % "key must be less than 250 characters")
    nil
  else
    key
  end
end