Class: GenericCommand

Inherits:
Object
  • Object
show all
Defined in:
lib/CommandManager.rb

Direct Known Subclasses

LocalCommand, SSHCommand

Constant Summary collapse

ERROR_OPEN = 
"ERROR MESSAGE --8<------"
ERROR_CLOSE = 
"ERROR MESSAGE ------>8--"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(command, logger = nil, stdin = nil, timeout = nil) ⇒ GenericCommand

Creates the new command: command: string with the command to be executed logger: proc that takes a message parameter and logs it



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# File 'lib/CommandManager.rb', line 60

def initialize(command, logger=nil, stdin=nil, timeout=nil)
    @command = command
    @logger  = logger
    @stdin   = stdin
    @timeout = timeout
end

Instance Attribute Details

#code ⇒ Object (readonly)

Returns the value of attribute code.



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# File 'lib/CommandManager.rb', line 48

def code
  @code
end

#command ⇒ Object (readonly)

Returns the value of attribute command.



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# File 'lib/CommandManager.rb', line 48

def command
  @command
end

#stderr ⇒ Object (readonly)

Returns the value of attribute stderr.



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# File 'lib/CommandManager.rb', line 48

def stderr
  @stderr
end

#stdout ⇒ Object (readonly)

Returns the value of attribute stdout.



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# File 'lib/CommandManager.rb', line 48

def stdout
  @stdout
end

Class Method Details

.run(command, logger = nil, stdin = nil, timeout = nil) ⇒ Object

Creates a command and runs it



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# File 'lib/CommandManager.rb', line 51

def self.run(command, logger=nil, stdin=nil, timeout=nil)
    cmd = self.new(command, logger, stdin, timeout)
    cmd.run
    cmd
end

Instance Method Details

#get_error_message ⇒ Object

Parses error message from stderr output



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# File 'lib/CommandManager.rb', line 103

def get_error_message
    tmp=@stderr.scan(/^#{ERROR_OPEN}\n(.*?)#{ERROR_CLOSE}$/m)
    return "-" if !tmp[0]
    tmp[0].join(' ').strip
end

#log(message, all = true) ⇒ Object

Sends a log message to the logger proc



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# File 'lib/CommandManager.rb', line 68

def log(message, all=true)
    @logger.call(message, all) if @logger
end

#run ⇒ Object

Runs the command



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# File 'lib/CommandManager.rb', line 73

def run
    begin
        @stdout, @stderr, status = execute

        if status && status.exited?
            @code = status.exitstatus
        else
            @code = 255
        end

        if @code != 0
            log("Command execution failed (exit code: #{@code}): #{command}")
            log(@stderr)
        end
    rescue Exception => e
        if e.is_a?(Timeout::Error)
            error_message = "Timeout executing #{command}"
        else
            error_message = "Internal error #{e}"
        end

        log(error_message)
        @stderr = ERROR_OPEN + "\n" + error_message + "\n" + ERROR_CLOSE
        @code = 255
    end

    return @code
end