Class: Aws::AWSErrorHandler

Inherits:
Object show all
Defined in:
lib/awsbase/right_awsbase.rb

Constant Summary collapse

DEFAULT_CLOSE_ON_4XX_PROBABILITY =

0-100 (%)

10
@@reiteration_start_delay = 
0.2
@@reiteration_time = 
5
@@close_on_error = 
true
@@close_on_4xx_probability = 
DEFAULT_CLOSE_ON_4XX_PROBABILITY

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(aws, parser, params = {}) ⇒ AWSErrorHandler

params:

:reiteration_time
:errors_list
:close_on_error           = true | false
:close_on_4xx_probability = 1-100



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# File 'lib/awsbase/right_awsbase.rb', line 899

def initialize(aws, parser, params={}) #:nodoc:
    @aws = aws # Link to RightEc2 | RightSqs | RightS3 instance
    @parser = parser # parser to parse Amazon response
    @started_at = Time.now
    @stop_at = @started_at + (params[:reiteration_time] || @@reiteration_time)
    @errors_list = params[:errors_list] || []
    @reiteration_delay = @@reiteration_start_delay
    @retries = 0
    # close current HTTP(S) connection on 5xx, errors from list and 4xx errors
    @close_on_error = params[:close_on_error].nil? ? @@close_on_error : params[:close_on_error]
    @close_on_4xx_probability = params[:close_on_4xx_probability] || @@close_on_4xx_probability
end

Class Method Details

.close_on_4xx_probability ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 886

def self.close_on_4xx_probability
    @@close_on_4xx_probability
end

.close_on_4xx_probability=(close_on_4xx_probability) ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 890

def self.close_on_4xx_probability=(close_on_4xx_probability)
    @@close_on_4xx_probability = close_on_4xx_probability
end

.close_on_error ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 876

def self.close_on_error
    @@close_on_error
end

.close_on_error=(close_on_error) ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 880

def self.close_on_error=(close_on_error)
    @@close_on_error = close_on_error
end

.reiteration_start_delay ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 856

def self.reiteration_start_delay
    @@reiteration_start_delay
end

.reiteration_start_delay=(reiteration_start_delay) ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 860

def self.reiteration_start_delay=(reiteration_start_delay)
    @@reiteration_start_delay = reiteration_start_delay
end

.reiteration_time ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 866

def self.reiteration_time
    @@reiteration_time
end

.reiteration_time=(reiteration_time) ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 870

def self.reiteration_time=(reiteration_time)
    @@reiteration_time = reiteration_time
end

Instance Method Details

#check(request) ⇒ Object

Returns false if



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# File 'lib/awsbase/right_awsbase.rb', line 913

def check(request) #:nodoc:
    result = false
    error_found = false
    redirect_detected= false
    error_match = nil
    last_errors_text = ''
    response = @aws.last_response
    # log error
    request_text_data = "#{request[:server]}:#{request[:port]}#{request[:request].path}"
    # is this a redirect?
    # yes!
    if response.is_a?(Net::HTTPRedirection)
        redirect_detected = true
    else
        # no, it's an error ...
        @aws.logger.warn("##### #{@aws.class.name} returned an error: #{response.code} #{response.message}\n#{response.body} #####")
        @aws.logger.warn("##### #{@aws.class.name} request: #{request_text_data} ####")
    end
    # Check response body: if it is an Amazon XML document or not:
    if redirect_detected || (response.body && response.body[/<\?xml/]) # ... it is a xml document
        @aws.class.bench_xml.add! do
            error_parser = RightErrorResponseParser.new
            error_parser.parse(response)
            @aws.last_errors = error_parser.errors
            @aws.last_request_id = error_parser.requestID
            last_errors_text = @aws.last_errors.flatten.join("\n")
            # on redirect :
            if redirect_detected
                location = response['location']
                # ... log information and ...
                @aws.logger.info("##### #{@aws.class.name} redirect requested: #{response.code} #{response.message} #####")
                @aws.logger.info("##### New location: #{location} #####")
                # ... fix the connection data
                request[:server] = URI.parse(location).host
                request[:protocol] = URI.parse(location).scheme
                request[:port] = URI.parse(location).port
            end
        end
    else # ... it is not a xml document(probably just a html page?)
        @aws.last_errors = [[response.code, "#{response.message} (#{request_text_data})"]]
        @aws.last_request_id = '-undefined-'
        last_errors_text = response.message
    end
    # now - check the error
    unless redirect_detected
        @errors_list.each do |error_to_find|
            if last_errors_text[/#{error_to_find}/i]
                error_found = true
                error_match = error_to_find
                @aws.logger.warn("##### Retry is needed, error pattern match: #{error_to_find} #####")
                break
            end
        end
    end
    # check the time has gone from the first error come
    if redirect_detected || error_found
        # Close the connection to the server and recreate a new one.
        # It may have a chance that one server is a semi-down and reconnection
        # will help us to connect to the other server
        if !redirect_detected && @close_on_error
            @aws.connection.finish "#{self.class.name}: error match to pattern '#{error_match}'"
        end

        if (Time.now < @stop_at)
            @retries += 1
            unless redirect_detected
                @aws.logger.warn("##### Retry ##{@retries} is being performed. Sleeping for #{@reiteration_delay} sec. Whole time: #{Time.now-@started_at} sec ####")
                sleep @reiteration_delay
                @reiteration_delay *= 2

                # Always make sure that the fp is set to point to the beginning(?)
                # of the File/IO. TODO: it assumes that offset is 0, which is bad.
                if (request[:request].body_stream && request[:request].body_stream.respond_to?(:pos))
                    begin
                        request[:request].body_stream.pos = 0
                    rescue Exception => e
                        @logger.warn("Retry may fail due to unable to reset the file pointer" +
                                " -- #{self.class.name} : #{e.inspect}")
                    end
                end
            else
                @aws.logger.info("##### Retry ##{@retries} is being performed due to a redirect.  ####")
            end
            result = @aws.request_info(request, @parser)
        else
            @aws.logger.warn("##### Ooops, time is over... ####")
        end
        # aha, this is unhandled error:
    elsif @close_on_error
        # Is this a 5xx error ?
        if @aws.last_response.code.to_s[/^5\d\d$/]
            @aws.connection.finish "#{self.class.name}: code: #{@aws.last_response.code}: '#{@aws.last_response.message}'"
            # Is this a 4xx error ?
        elsif @aws.last_response.code.to_s[/^4\d\d$/] && @close_on_4xx_probability > rand(100)
            @aws.connection.finish "#{self.class.name}: code: #{@aws.last_response.code}: '#{@aws.last_response.message}', " +
                    "probability: #{@close_on_4xx_probability}%"
        end
    end
    result
end