Class: EmSequelAsync::Mysql::ClientPool

Inherits:
Object
  • Object
show all
Defined in:
lib/em-sequel-async/mysql.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(db) ⇒ ClientPool

Instance Methods ===================================================



28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
 
# File 'lib/em-sequel-async/mysql.rb', line 28

def initialize(db)
  @db = db
  @options = {
    symbolize_keys: true,
    cast_booleans: true
  }

  db.opts.each do |key, value|
    case (key)
    when :database, :username, :password, :host, :port, :socket, :encoding, :charset, :compress, :timeout
      @options[key] = value
    when :user
      @options[:username] = value
    when :loggers
      if (value and !value.empty?)
        @options[:logging] = true
        @options[:logger] = value.first
      end
    end
  end
  
  @query_queue = [ ]

  @connections = { }
  @connection_pool = [ ]
  @connections_active = { }
  
  @connection_limit = db.opts[:connections] || self.class.size
  
  if (EventMachine.reactor_running? and self.class.trace?)
    EventMachine::PeriodicTimer.new(1) do
      dump_file = "#{self.class.trace}.#{@options[:database]}"
      
      File.open(dump_file, 'w') do |f|
        f.puts @options[:database]

        @connections.each do |c, x|
          next unless (x)
          
          f.puts "\t#{c.inspect} -> #{x.inspect}"
        end
        @connection_pool.each do |c|
          f.puts "\t#{c.inspect} (pool)"
        end
      
        @query_queue.each do |query, callback|
          f.puts "\t#{query}"
        end
      end
    end
  end
end

Class Method Details

.size ⇒ Object 



10
11
12
 
# File 'lib/em-sequel-async/mysql.rb', line 10

def self.size
  @size ||= 32
end

.size=(value) ⇒ Object

Class Methods ======================================================



5
6
7
8
 
# File 'lib/em-sequel-async/mysql.rb', line 5

def self.size=(value)
  @size = value.to_i
  @size = 1 if (@size <= 0)
end

.trace ⇒ Object 



18
19
20
 
# File 'lib/em-sequel-async/mysql.rb', line 18

def self.trace
  @trace
end

.trace=(value) ⇒ Object 



22
23
24
 
# File 'lib/em-sequel-async/mysql.rb', line 22

def self.trace=(value)
  @trace = value
end

.trace? ⇒ Boolean

Returns:

  • (Boolean) 


14
15
16
 
# File 'lib/em-sequel-async/mysql.rb', line 14

def self.trace?
  !!@trace
end

Instance Method Details

#add(connection) ⇒ Object 



89
90
91
92
93
94
95
96
97
98
 
# File 'lib/em-sequel-async/mysql.rb', line 89

def add(connection)
  @connections[connection] = nil
  
  if (@query_queue.empty?)
    @connections_active.delete(connection)
    @connection_pool << connection
  else
    self.delegate_query(connection, *@query_queue.pop)
  end
end

#delegate_query(connection, query, callback) ⇒ Object 



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
 
# File 'lib/em-sequel-async/mysql.rb', line 105

def delegate_query(connection, query, callback)
  @connections[connection] = [ query, callback ]

  start = Time.now
  deferrable = connection.query(
    query,
    database_timezone: @db.timezone,
    application_timezone: Sequel.application_timezone
  )
  
  deferrable.callback do |result|
    log(:debug, "(%.6fs) [OK] %s" % [ Time.now - start, query ])
    
    callback and callback.call(result, (Time.now - start).to_f, connection)

    self.add(connection)
  end

  deferrable.errback do |err|
    handled = false

    case (err)
    when Mysql2::Error
      case (err.message)
      when /^Deadlock/i
        self.delegate_query(connection, query, callback)

        handled = true
      when /Duplicate entry/i
        callback and callback.call(nil, (Time.now - start).to_f, connection, err)

        self.add(connection)

        handled = true
      when /MySQL server has gone away|Lost connection/i
        self.remove(connection)

        EventMachine::Timer.new(10) do
          self.query(query, &callback)
        end

        handled = true
      end
    end

    unless (handled)
      log(:error, "(%.6fs) [ERR] %s (%s: %s)" % [ Time.now - start, query, err.class, err ])
      log(:error, err.backtrace)

      callback and callback.call(false, (Time.now - start).to_f, connection, err)

      self.add(connection)
    end
  end

rescue Mysql2::Error => err
  case (err.message)
  when /MySQL server has gone away|Lost connection/i
    self.remove(connection)

    EventMachine::Timer.new(10) do
      self.query(query, &callback)
    end
  end
end

#log(level, *args) ⇒ Object 



85
86
87
 
# File 'lib/em-sequel-async/mysql.rb', line 85

def log(level, *args)
  @options[:logger] and @options[:logger].send(level, *args)
end

#logger ⇒ Object 



81
82
83
 
# File 'lib/em-sequel-async/mysql.rb', line 81

def logger
  @options[:logger]
end

#pool_connection ⇒ Object 



171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
 
# File 'lib/em-sequel-async/mysql.rb', line 171

def pool_connection
  connection = @connection_pool.pop
  
  if (!connection and @connections.length < @connection_limit)
    connection = Mysql2::EM::Client.new(@options)
  end

  @connections_active[connection] = true
  
  connection

rescue Mysql2::Error => err
  case (err.message)
  when /Too many connections/i
    return
  else
    raise err
  end
end

#query(query, callback = nil, &block) ⇒ Object 



191
192
193
194
195
196
197
198
199
200
201
202
203
 
# File 'lib/em-sequel-async/mysql.rb', line 191

def query(query, callback = nil, &block)
  callback ||= block

  if (connection = self.pool_connection)
    self.delegate_query(connection, query, callback)
    
    :executing
  else
    @query_queue << [ query, callback ]

    :queued
  end
end

#remove(connection) ⇒ Object 



100
101
102
103
 
# File 'lib/em-sequel-async/mysql.rb', line 100

def remove(connection)
  @connections.delete(connection)
  @connections_active.delete(connection)
end