Class: Scalyr::Common::Client::ClientSession

Inherits:
Object
  • Object
show all
Defined in:
lib/scalyr/common/client.rb

Overview

Encapsulates the connection between the agent and the Scalyr server, thus shielding the implementation (which may create a new connection for every post or use a persistent connection)

Instance Method Summary collapse

Constructor Details

#initialize(logger, add_events_uri, compression_type, compression_level, ssl_verify_peer, ssl_ca_bundle_path, ssl_verify_depth, append_builtin_cert, record_stats_for_status, flush_quantile_estimates_on_status_send) ⇒ ClientSession

Returns a new instance of ClientSession.



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# File 'lib/scalyr/common/client.rb', line 54

def initialize(logger, add_events_uri, compression_type, compression_level,
               ssl_verify_peer, ssl_ca_bundle_path, ssl_verify_depth, append_builtin_cert,
               record_stats_for_status, flush_quantile_estimates_on_status_send)
  @logger = logger
  @add_events_uri = add_events_uri  # typically /addEvents
  @compression_type = compression_type
  @compression_level = compression_level
  @ssl_verify_peer = ssl_verify_peer
  @ssl_ca_bundle_path = ssl_ca_bundle_path
  @append_builtin_cert = append_builtin_cert
  @ssl_verify_depth = ssl_verify_depth
  @record_stats_for_status = record_stats_for_status
  @flush_quantile_estimates_on_status_send = flush_quantile_estimates_on_status_send

  # A cert to use by default to avoid issues caused by the OpenSSL library not validating certs according to standard
  @cert_string = "" \
      "-----BEGIN CERTIFICATE-----\n" \
      "MIIG6zCCBNOgAwIBAgIJAM5aknNWtN6oMA0GCSqGSIb3DQEBCwUAMIGpMQswCQYD\n" \
      "VQQGEwJVUzETMBEGA1UECBMKQ2FsaWZvcm5pYTEXMBUGA1UEBxMOUG9ydG9sYSBW\n" \
      "YWxsZXkxEzARBgNVBAoTClNjYWx5ciBJbmMxFTATBgNVBAsTDFNjYWx5ciBBZ2Vu\n" \
      "dDEdMBsGA1UEAxMUU2NhbHlyIEFnZW50IENBIFJvb3QxITAfBgkqhkiG9w0BCQEW\n" \
      "EmNvbnRhY3RAc2NhbHlyLmNvbTAeFw0xNDA5MDkyMTUyMDVaFw0yNDA5MDYyMTUy\n" \
      "MDVaMIGpMQswCQYDVQQGEwJVUzETMBEGA1UECBMKQ2FsaWZvcm5pYTEXMBUGA1UE\n" \
      "BxMOUG9ydG9sYSBWYWxsZXkxEzARBgNVBAoTClNjYWx5ciBJbmMxFTATBgNVBAsT\n" \
      "DFNjYWx5ciBBZ2VudDEdMBsGA1UEAxMUU2NhbHlyIEFnZW50IENBIFJvb3QxITAf\n" \
      "BgkqhkiG9w0BCQEWEmNvbnRhY3RAc2NhbHlyLmNvbTCCAiIwDQYJKoZIhvcNAQEB\n" \
      "BQADggIPADCCAgoCggIBALdNamcMNVxkIB6qVWmNCi1jeyeqOX00rYAWDlyBHff7\n" \
      "vU833Evuixgrf0HxrOQNiPsOK66ehG6LfJd2UIBDEHBCXRo+aeFQLrCLIVXiqJ2W\n" \
      "Tvl7dUU9d7zfw/XXif3lMQTiyQAWYTyjfugDczEScEUk93EWFfW47j9PTGh96yKm\n" \
      "nVbfOxD4XbN0ykdo85cs7M/NOHQj4q34l77XGXrit+nb1cL3wS9ZzJG8s40J2+Dp\n" \
      "LUA8KBQuvim6hfqrjaDX0bXVvc52a7TSh/zb58gkLbiqvBuPo5P8PBLHCx8bJtZu\n" \
      "fjWRdjaftgw7CcsdIuMhbm3823WI/A+/p4s1B5KOPqOYRkgG8FBqFIRTecKAV5wC\n" \
      "Z2ruTytoOUBWItrheyJhm+99X1I2y/6mdecBdk7j3+8U+nCsGHkH5Jwjl2BH9tfT\n" \
      "RUhVTCQs25XLNm41kZo7xK464xZsJKHXj9jr5gLIdF6CgzU2uYsQHKcw1pAVITLe\n" \
      "bfGEob8AcL0E7+1hurRjyYxtxZpsZeGMwI0/BStT+fLEAOJ1byGUgSUbhi9lJ8Hc\n" \
      "+NZDfaCaCZKRxjePCqeWjZUUdVoH3fNSi2GuNLqtOFzxlkP5tBErnXufE6XZAtEQ\n" \
      "lv/9qxa4ZLsvhbt+6qQryIAHL4aReh/VReER438ARdwG2QDK+vRfhNpke69em5Kb\n" \
      "AgMBAAGjggESMIIBDjAdBgNVHQ4EFgQUENX6MjnzqTJdTQMAEakSdXV/I80wgd4G\n" \
      "A1UdIwSB1jCB04AUENX6MjnzqTJdTQMAEakSdXV/I82hga+kgawwgakxCzAJBgNV\n" \
      "BAYTAlVTMRMwEQYDVQQIEwpDYWxpZm9ybmlhMRcwFQYDVQQHEw5Qb3J0b2xhIFZh\n" \
      "bGxleTETMBEGA1UEChMKU2NhbHlyIEluYzEVMBMGA1UECxMMU2NhbHlyIEFnZW50\n" \
      "MR0wGwYDVQQDExRTY2FseXIgQWdlbnQgQ0EgUm9vdDEhMB8GCSqGSIb3DQEJARYS\n" \
      "Y29udGFjdEBzY2FseXIuY29tggkAzlqSc1a03qgwDAYDVR0TBAUwAwEB/zANBgkq\n" \
      "hkiG9w0BAQsFAAOCAgEAmmgm1AeO7wfuR36HHgpZCKZxboRFwc2FzKaHNSg2FQ0G\n" \
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      "pKlDDH6OfYjDplBzoqf5PkPgxZNyiZ7nyNUWz+P2vesLFVynmej2MvLIZVnEJ2Wp\n" \
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      "gdzEU3wEQYWc36j3XCsp7ZDvgTm6FpyHS5ccMpXR1E62tVINGX9r+97ZHyxjqurb\n" \
      "606y1FzV/5Mf/aihPYSSreq63UVqdsaQfyS77Q4tpJofq875w8nd2Vs3guDs2T0h\n" \
      "1bOlV3e2HfglWsHKwNguQZo2nfMUp11IYfV/HOKWNQkbrPhuayXMi3i2wCZe9JNt\n" \
      "P9uZ2OjzsVu2QFcSlvZF6y02/bjbNATRfj/J/SHNFyCDu6bXhtAu0yZzFLiOZxjD\n" \
      "LwzunBMoWcJj+P2Vx3OhbE9FMyMeKdOWdTgiI1GLEkfJi6s7d/tk1ayLmbBTRD/e\n" \
      "XkjSeLBss6mA1INuE1+gKVA4MABsUiLqGZ8xCPN16CyPcTqL2TJFo1IOqivMxKDh\n" \
      "H4Z/mHoGi5SRnye+Wo+jyiQiWjJQ5LrlQPbHmuO0tLs9lM1t9nhzLifzga5F4+o=\n" \
      "-----END CERTIFICATE-----"

  # Request statistics are accumulated across multiple threads and must be accessed through a mutex
  @stats_lock = Mutex.new
  @latency_stats = get_new_latency_stats
  @stats = {
      :total_requests_sent => 0, # The total number of RPC requests sent.
      :total_requests_failed => 0, # The total number of RPC requests that failed.
      :total_request_bytes_sent => 0, # The total number of bytes sent over the network.
      :total_compressed_request_bytes_sent => 0,  # The total number of compressed bytes sent over the network
      :total_response_bytes_received => 0,  # The total number of bytes received.
      :total_request_latency_secs => 0, #  The total number of secs spent waiting for a responses (so average latency
      # can be calculated by dividing this number by @total_requests_sent).
      # This includes connection establishment time.
      :total_serialization_duration_secs => 0, # The total duration (in seconds) it took to serialize (JSON dumos) all the request bodies.
      # You can calculate avg compression duration by diving this value with total_requests_sent
      :total_compression_duration_secs => 0, # The total duration (in seconds) it took to compress all the request bodies.
      # You can calculate avg compression duration by diving this value with total_requests_sent
      :compression_type => @compression_type,
      :compression_level => @compression_level,
  }

  @http = Net::HTTP::Persistent.new

  # verify peers to prevent potential MITM attacks
  if @ssl_verify_peer
    @ca_cert = Tempfile.new("ca_cert")
    if File.file?(@ssl_ca_bundle_path)
      @ca_cert.write(File.read(@ssl_ca_bundle_path))
      @ca_cert.flush
    end
    if @append_builtin_cert
      open(@ca_cert.path, 'a') do |f|
        f.puts @cert_string
      end
    end
    @ca_cert.flush
    @http.ca_file = @ca_cert.path
    @http.verify_mode = OpenSSL::SSL::VERIFY_PEER
    @http.verify_depth = @ssl_verify_depth
  else
    @http.verify_mode = OpenSSL::SSL::VERIFY_NONE
  end
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/scalyr/common/client.rb', line 247

def close
  @http.shutdown
end

#get_new_latency_stats ⇒ Object

Convenience method to create a fresh quantile estimator



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# File 'lib/scalyr/common/client.rb', line 154

def get_new_latency_stats
  return {
    # The total number of HTTP connections successfully created.
    :serialization_duration_secs => Quantile::Estimator.new, # The duration (in seconds) it took to serialize (JSON dumos) all the request bodies.
    :compression_duration_secs => Quantile::Estimator.new, # The duration (in seconds) it took to compress all the request bodies.
    :request_latency_secs => Quantile::Estimator.new, #  Secs spent waiting for a responses. This includes connection establishment time.
    :bytes_sent => Quantile::Estimator.new  # The number of bytes sent over the network. Batch size with a bit more overhead.
  }
end

#get_stats ⇒ Object

Get a clone of current statistics hash and calculate percentiles



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# File 'lib/scalyr/common/client.rb', line 165

def get_stats
  current_stats = @stats.clone

  current_stats[:request_latency_p50] = @latency_stats[:request_latency_secs].query(0.5)
  current_stats[:request_latency_p90] = @latency_stats[:request_latency_secs].query(0.9)
  current_stats[:request_latency_p99] = @latency_stats[:request_latency_secs].query(0.99)
  current_stats[:serialization_duration_secs_p50] = @latency_stats[:serialization_duration_secs].query(0.5)
  current_stats[:serialization_duration_secs_p90] = @latency_stats[:serialization_duration_secs].query(0.9)
  current_stats[:serialization_duration_secs_p99] = @latency_stats[:serialization_duration_secs].query(0.99)
  current_stats[:compression_duration_secs_p50] = @latency_stats[:compression_duration_secs].query(0.5)
  current_stats[:compression_duration_secs_p90] = @latency_stats[:compression_duration_secs].query(0.9)
  current_stats[:compression_duration_secs_p99] = @latency_stats[:compression_duration_secs].query(0.99)
  current_stats[:bytes_sent_p50] = @latency_stats[:bytes_sent].query(0.5)
  current_stats[:bytes_sent_p90] = @latency_stats[:bytes_sent].query(0.9)
  current_stats[:bytes_sent_p99] = @latency_stats[:bytes_sent].query(0.99)

  if @flush_quantile_estimates_on_status_send
    @logger.debug "Recreating / reseting quantile estimator classes for plugin metrics"
    @latency_stats = get_new_latency_stats
  end
  current_stats
end

#post_add_events(body, is_status, body_serialization_duration = 0) ⇒ Object

Upload data to Scalyr. Assumes that the body size complies with Scalyr limits



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# File 'lib/scalyr/common/client.rb', line 191

def post_add_events(body, is_status, body_serialization_duration = 0)
  post, compression_duration = prepare_post_object @add_events_uri.path, body
  fail_count = 1  # putative assume failure
  start_time = Time.now
  uncompressed_bytes_sent = 0
  compressed_bytes_sent = 0
  bytes_received = 0
  begin
    response = @http.request(@add_events_uri, post)
    handle_response(response)

    fail_count -= 1  # success means we negate the putative failure
    uncompressed_bytes_sent = (body.bytesize + @add_events_uri.path.bytesize)
    compressed_bytes_sent = (post.body.bytesize + @add_events_uri.path.bytesize)
    bytes_received = response.body.bytesize  # echee: double check
      # echee TODO add more statistics

  rescue OpenSSL::SSL::SSLError => e
    if @ssl_verify_peer and @ssl_ca_bundle_path.nil? and !File.file?(@ca_cert.path)
      @ca_cert = Tempfile.new("ca_cert")
      @ca_cert.write(@cert_string)
      @ca_cert.flush
      @http.ca_file = @ca_cert.path
      raise ClientError.new("Packaged certificate appears to have been deleted, writing a new one.", @add_events_uri)
    else
      raise e
    end

  rescue Net::HTTP::Persistent::Error => e
    # The underlying persistent-connection library automatically retries when there are network-related errors.
    # Eventually, it will give up and raise this generic error, at which time, we convert it to a ClientError
    raise ClientError.new(e.message, @add_events_uri)

  ensure
    if @record_stats_for_status or !is_status
      @stats_lock.synchronize do
        @stats[:total_requests_sent] += 1
        @stats[:total_requests_failed] += fail_count
        @stats[:total_request_bytes_sent] += uncompressed_bytes_sent
        @stats[:total_compressed_request_bytes_sent] += compressed_bytes_sent
        @stats[:total_response_bytes_received] += bytes_received
        @stats[:total_serialization_duration_secs] += body_serialization_duration
        @stats[:total_compression_duration_secs] += compression_duration
        end_time = Time.now
        @stats[:total_request_latency_secs] += (end_time - start_time)
        @latency_stats[:request_latency_secs].observe(end_time - start_time)
        @latency_stats[:serialization_duration_secs].observe(body_serialization_duration)
        @latency_stats[:compression_duration_secs].observe(compression_duration)
        @latency_stats[:bytes_sent].observe(uncompressed_bytes_sent)
      end
    end
  end
end