Class: DevCycle::ConfigManager

Inherits:
Object
  • Object
show all
Extended by:
T::Sig
Defined in:
lib/devcycle-ruby-server-sdk/localbucketing/config_manager.rb

Instance Method Summary collapse

Constructor Details

#initialize(sdkKey, local_bucketing, wait_for_init) ⇒ ConfigManager

Returns a new instance of ConfigManager.



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# File 'lib/devcycle-ruby-server-sdk/localbucketing/config_manager.rb', line 17

def initialize(sdkKey, local_bucketing, wait_for_init)
  @first_load = true
  @config_version = "v1"
  @local_bucketing = local_bucketing
  @sdkKey = sdkKey
  @config_e_tag = ""
  @config_last_modified = ""
  @logger = local_bucketing.options.logger
  @polling_enabled = true
  @max_config_retries = 2

  @config_poller = Concurrent::TimerTask.new({
                                               execution_interval: @local_bucketing.options.config_polling_interval_ms.fdiv(1000)
                                             }) do |task|
    fetch_config
  end

  t = Thread.new { initialize_config }
  t.join if wait_for_init
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/devcycle-ruby-server-sdk/localbucketing/config_manager.rb', line 138

def close
  @config_poller.shutdown if @config_poller.running?
  nil
end

#fetch_config ⇒ Object 



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# File 'lib/devcycle-ruby-server-sdk/localbucketing/config_manager.rb', line 49

def fetch_config
  return unless @polling_enabled

  req = Typhoeus::Request.new(
    get_config_url,
    headers: {
      Accept: "application/json",
    })

  begin
    Date.parse(@config_last_modified)
    if @config_last_modified != ""
      req.options[:headers]["If-Modified-Since"] = Time.httpdate(@config_last_modified)
    end
  rescue
  end


  if @config_e_tag != ""
    req.options[:headers]['If-None-Match'] = @config_e_tag
  end

  @max_config_retries.times do
    @logger.debug("Requesting new config from #{get_config_url}, current etag: #{@config_e_tag}, last modified: #{@config_last_modified}")
    resp = req.run
    @logger.debug("Config request complete, status: #{resp.code}")
    case resp.code
    when 304
      @logger.debug("Config not modified, using cache, etag: #{@config_e_tag}, last modified: #{@config_last_modified}")
      break
    when 200
      @logger.debug("New config received, etag: #{resp.headers['Etag']} LM:#{resp.headers['Last-Modified']}")
      lm_header = resp.headers['Last-Modified']
      begin
        lm_timestamp = Time.rfc2822(lm_header)
        current_lm = Time.rfc2822(@config_last_modified)
        if lm_timestamp == "" && @config_last_modified == "" || (current_lm.utc < lm_timestamp.utc)
          set_config(resp.body, resp.headers['Etag'], lm_header)
          @logger.debug("New config stored, etag: #{@config_e_tag}, last modified: #{lm_header}")
        else
          @logger.warn("Config response was an older config than currently stored config.")
        end
      rescue
        @logger.warn("Failed to parse last modified header, setting config.")
        set_config(resp.body, resp.headers['Etag'], lm_header)
      end
      break
    when 403
      stop_polling
      @logger.error("Failed to download DevCycle config; Invalid SDK Key.")
      break
    when 404
      stop_polling
      @logger.error("Failed to download DevCycle config; Config not found.")
      break
    when 500...599
      @logger.error("Failed to download DevCycle config. Status: #{resp.code}")
    else
      @logger.error("Unexpected response from DevCycle CDN")
      @logger.error("Response code: #{resp.code}")
      @logger.error("Response body: #{resp.body}")
      break
    end
  end

  nil
end

#get_config_url ⇒ Object 



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# File 'lib/devcycle-ruby-server-sdk/localbucketing/config_manager.rb', line 128

def get_config_url
  configBasePath = @local_bucketing.options.config_cdn_uri
  "#{configBasePath}/config/#{@config_version}/server/#{@sdkKey}.json"
end

#initialize_config ⇒ Object 



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# File 'lib/devcycle-ruby-server-sdk/localbucketing/config_manager.rb', line 38

def initialize_config
  begin
    fetch_config
    @config_poller.execute if @polling_enabled
  rescue => e
    @logger.error("DevCycle: Error Initializing Config: #{e.message}")
  ensure
    @local_bucketing.initialized = true
  end
end

#set_config(config, etag, lastmodified) ⇒ Object 



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# File 'lib/devcycle-ruby-server-sdk/localbucketing/config_manager.rb', line 117

def set_config(config, etag, lastmodified)
  if !JSON.parse(config).is_a?(Hash)
    raise("Invalid JSON body parsed from Config Response")
  end

  @local_bucketing.store_config(config)
  @config_e_tag = etag
  @config_last_modified = lastmodified
  @local_bucketing.has_config = true
end

#stop_polling ⇒ Object 



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# File 'lib/devcycle-ruby-server-sdk/localbucketing/config_manager.rb', line 133

def stop_polling
  @polling_enabled = false
  @config_poller.shutdown if @config_poller.running?
end