Module: CloudCrowd

Defined in:
lib/cloud-crowd.rb,
lib/cloud_crowd/node.rb,
lib/cloud_crowd/action.rb,
lib/cloud_crowd/models.rb,
lib/cloud_crowd/server.rb,
lib/cloud_crowd/worker.rb,
lib/cloud_crowd/helpers.rb,
lib/cloud_crowd/inflector.rb,
lib/cloud_crowd/exceptions.rb,
lib/cloud_crowd/models/job.rb,
lib/cloud_crowd/asset_store.rb,
lib/cloud_crowd/command_line.rb,
lib/cloud_crowd/models/work_unit.rb,
lib/cloud_crowd/helpers/resources.rb,
lib/cloud_crowd/models/node_record.rb,
lib/cloud_crowd/asset_store/s3_store.rb,
lib/cloud_crowd/helpers/authorization.rb,
lib/cloud_crowd/asset_store/cloudfiles_store.rb,
lib/cloud_crowd/asset_store/filesystem_store.rb

Defined Under Namespace

Modules: Helpers, Inflector, ModelStatus Classes: Action, AssetStore, CommandLine, Error, Job, Node, NodeRecord, Server, WorkUnit, Worker

Constant Summary collapse

VERSION =

Keep this version in sync with the gemspec.

'0.7.0'
SCHEMA_VERSION =

Increment the schema version when there's a backwards incompatible change.

4
ROOT =

Root directory of the CloudCrowd gem.

File.expand_path(File.dirname(__FILE__) + '/..')
LOG_PATH =

Default folder to log daemonized servers and nodes into.

'log'
PID_PATH =

Default folder to contain the pids of daemonized servers and nodes.

'tmp/pids'
MIN_RETRIES =

Minimum number of attempts per work unit.

1
PROCESSING =

A Job is processing if its WorkUnits are in the queue to be handled by nodes.

1
SUCCEEDED =

A Job has succeeded if all of its WorkUnits have finished successfully.

2
FAILED =

A Job has failed if even a single one of its WorkUnits has failed (they may be attempted multiple times on failure, however).

3
SPLITTING =

A Job is splitting if it's in the process of dividing its inputs up into multiple WorkUnits.

4
MERGING =

A Job is merging if it's busy collecting all of its successful WorkUnits back together into the final result.

5
COMPLETE =

A Job is considered to be complete if it succeeded or if it failed.

[SUCCEEDED, FAILED]
INCOMPLETE =

A Job is considered incomplete if it's being processed, split up or merged.

[PROCESSING, SPLITTING, MERGING]
DISPLAY_STATUS_MAP =

Mapping of statuses to their display strings.

['unknown', 'processing', 'succeeded', 'failed', 'splitting', 'merging']

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.config ⇒ Object (readonly)

Returns the value of attribute config.



95
96
97
 
# File 'lib/cloud-crowd.rb', line 95

def config
  @config
end

.identity ⇒ Object

Returns the value of attribute identity.



96
97
98
 
# File 'lib/cloud-crowd.rb', line 96

def identity
  @identity
end

Class Method Details

.action_paths ⇒ Object

Retrieve the list of every installed Action for this node or server.



178
179
180
181
182
183
 
# File 'lib/cloud-crowd.rb', line 178

def action_paths
  default_actions   = config[:disable_default_actions] ? [] : Dir["#{ROOT}/actions/*.rb"]
  installed_actions = Dir["#{@config_path}/actions/*.rb"]
  custom_actions    = CloudCrowd.config[:actions_path] ? Dir["#{CloudCrowd.config[:actions_path]}/*.rb"] : []
  default_actions + installed_actions + custom_actions
end

.actions ⇒ Object

CloudCrowd::Actions are requested dynamically by name. Access them through this actions property, which behaves like a hash. At load time, we load all installed Actions and CloudCrowd's default Actions into it. If you wish to have certain nodes be specialized to only handle certain Actions, then install only those into the actions directory.



164
165
166
167
168
169
170
171
172
173
174
175
 
# File 'lib/cloud-crowd.rb', line 164

def actions
  return @actions if @actions
  @actions = action_paths.inject({}) do |memo, path|
    name = File.basename(path, File.extname(path))
    require path
    memo[name] = Module.const_get(Inflector.camelize(name))
    memo
  end
rescue NameError => e
  adjusted_message = "One of your actions failed to load. Please ensure that the name of your action class can be deduced from the name of the file. ex: 'word_count.rb' => 'WordCount'\n#{e.message}"
  raise NameError.new(adjusted_message, e.name)
end

.central_server ⇒ Object

Get a reference to the central server, including authentication if configured.



121
122
123
 
# File 'lib/cloud-crowd.rb', line 121

def central_server
  @central_server ||= RestClient::Resource.new(CloudCrowd.config[:central_server], CloudCrowd.client_options)
end

.client_options ⇒ Object

The standard RestClient options for the central server talking to nodes, as well as the other way around. There's a timeout of 5 seconds to open a connection, and a timeout of 30 to finish reading it.



140
141
142
143
144
145
146
147
148
149
150
151
 
# File 'lib/cloud-crowd.rb', line 140

def client_options
  return @client_options if @client_options
  @client_options = {
    :timeout => (self.server? ? config[:node_timeout] : config[:server_timeout]) || 30,
    :open_timeout => config[:open_timeout] || 5
  }
  if CloudCrowd.config[:http_authentication]
    @client_options[:user]      = CloudCrowd.config[:login]
    @client_options[:password]  = CloudCrowd.config[:password]
  end
  @client_options
end

.configure(config_path) ⇒ Object

Configure CloudCrowd by passing in the path to config.yml.



99
100
101
102
103
 
# File 'lib/cloud-crowd.rb', line 99

def configure(config_path)
  @config_path = File.expand_path(File.dirname(config_path))
  @config = YAML.load(ERB.new(File.read(config_path)).result)
  @config[:work_unit_retries] ||= MIN_RETRIES
end

.configure_database(config_path, validate_schema = true) ⇒ Object

Configure the CloudCrowd central database (and connect to it), by passing in a path to database.yml. The file should use the standard ActiveRecord connection format.



108
109
110
111
112
113
114
115
116
117
 
# File 'lib/cloud-crowd.rb', line 108

def configure_database(config_path, validate_schema=true)
  configuration = YAML.load(ERB.new(File.read(config_path)).result)
  ActiveRecord::Base.establish_connection(configuration)
  if validate_schema
    version = ActiveRecord::Base.connection.select_values('select max(version) from schema_migrations').first.to_i
    return true if version == SCHEMA_VERSION
    puts "Your database schema is out of date. Please use `crowd load_schema` to update it. This will wipe all the tables, so make sure that your jobs have a chance to finish first.\nexiting..."
    exit
  end
end

.display_status(status) ⇒ Object

Return the displayable status name of an internal CloudCrowd status number. (See the above constants).



155
156
157
 
# File 'lib/cloud-crowd.rb', line 155

def display_status(status)
  DISPLAY_STATUS_MAP[status] || 'unknown'
end

.log_path(log_file = nil) ⇒ Object

The path that daemonized servers and nodes will log to.



126
127
128
129
 
# File 'lib/cloud-crowd.rb', line 126

def log_path(log_file=nil)
  @log_path ||= config[:log_path] || LOG_PATH
  log_file ? File.join(@log_path, log_file) : @log_path
end

.node? ⇒ Boolean

Or is it a node?

Returns:

  • (Boolean) 


192
193
194
 
# File 'lib/cloud-crowd.rb', line 192

def node?
  @identity == :node
end

.pid_path(pid_file = nil) ⇒ Object

The path in which daemonized servers and nodes will store their pids.



132
133
134
135
 
# File 'lib/cloud-crowd.rb', line 132

def pid_path(pid_file=nil)
  @pid_path ||= config[:pid_path] || PID_PATH
  pid_file ? File.join(@pid_path, pid_file) : @pid_path
end

.server? ⇒ Boolean

Is this CloudCrowd instance a server? Useful for avoiding loading unneeded code from actions.

Returns:

  • (Boolean) 


187
188
189
 
# File 'lib/cloud-crowd.rb', line 187

def server?
  @identity == :server
end