Class: SemanticLogger::Log

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

Overview

Log

Class to hold all log entry information

level

Log level of the supplied log call
:trace, :debug, :info, :warn, :error, :fatal

thread_name

Name of the thread in which the logging call was called

name

Class name supplied to the logging instance

message

Text message to be logged

payload

Optional Hash or Ruby Exception object to be logged

time

The time at which the log entry was created

duration

The time taken to complete a measure call

tags

Any tags active on the thread when the log call was made

level_index

Internal index of the log level

exception

Ruby Exception object to log

metric [Object]

Object supplied when measure_x was called

backtrace [Array<String>]

The backtrace captured at source when the log level >= SemanticLogger.backtrace_level

metric_amount [Numeric]

Used for numeric or counter metrics.
For example, the number of inquiries or, the amount purchased etc.

context [Hash]

Named contexts that were captured when the log entry was created.

Defined Under Namespace

Classes: DeprecatedLogger

Constant Summary collapse

MAX_EXCEPTIONS_TO_UNWRAP = 
5
CALLER_REGEXP = 
/^(.*):(\d+).*/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, level, index = nil) ⇒ Log

Returns a new instance of Log.



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# File 'lib/semantic_logger/log.rb', line 52

def initialize(name, level, index = nil)
  @level       = level
  @thread_name = Thread.current.name
  @name        = name
  @time        = Time.now
  @tags        = SemanticLogger.tags
  @named_tags  = SemanticLogger.named_tags
  @level_index = index.nil? ? SemanticLogger.level_to_index(level) : index
end

Instance Attribute Details

#backtrace ⇒ Object

Returns the value of attribute backtrace.



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# File 'lib/semantic_logger/log.rb', line 50

def backtrace
  @backtrace
end

#context ⇒ Object

Returns the value of attribute context.



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# File 'lib/semantic_logger/log.rb', line 50

def context
  @context
end

#duration ⇒ Object

Returns the value of attribute duration.



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# File 'lib/semantic_logger/log.rb', line 50

def duration
  @duration
end

#exception ⇒ Object

Returns the value of attribute exception.



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# File 'lib/semantic_logger/log.rb', line 50

def exception
  @exception
end

#level ⇒ Object

Returns the value of attribute level.



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# File 'lib/semantic_logger/log.rb', line 50

def level
  @level
end

#level_index ⇒ Object

Returns the value of attribute level_index.



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# File 'lib/semantic_logger/log.rb', line 50

def level_index
  @level_index
end

#message ⇒ Object

Returns the value of attribute message.



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# File 'lib/semantic_logger/log.rb', line 50

def message
  @message
end

#metric ⇒ Object

Returns the value of attribute metric.



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# File 'lib/semantic_logger/log.rb', line 50

def metric
  @metric
end

#metric_amount ⇒ Object

Returns the value of attribute metric_amount.



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# File 'lib/semantic_logger/log.rb', line 50

def metric_amount
  @metric_amount
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/semantic_logger/log.rb', line 50

def name
  @name
end

#named_tags ⇒ Object

Returns the value of attribute named_tags.



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# File 'lib/semantic_logger/log.rb', line 50

def named_tags
  @named_tags
end

#payload ⇒ Object

Returns the value of attribute payload.



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# File 'lib/semantic_logger/log.rb', line 50

def payload
  @payload
end

#tags ⇒ Object

Returns the value of attribute tags.



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# File 'lib/semantic_logger/log.rb', line 50

def tags
  @tags
end

#thread_name ⇒ Object

Returns the value of attribute thread_name.



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# File 'lib/semantic_logger/log.rb', line 50

def thread_name
  @thread_name
end

#time ⇒ Object

Returns the value of attribute time.



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# File 'lib/semantic_logger/log.rb', line 50

def time
  @time
end

Instance Method Details

#assign(message: nil, payload: nil, min_duration: 0.0, exception: nil, metric: nil, metric_amount: 1, duration: nil, backtrace: nil, log_exception: :full, on_exception_level: nil) ⇒ Object

Assign named arguments to this log entry, supplying defaults where applicable

Returns [true|false] whether this log entry should be logged

Example:

logger.info(name: 'value')



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# File 'lib/semantic_logger/log.rb', line 68

def assign(message: nil, payload: nil, min_duration: 0.0, exception: nil, metric: nil, metric_amount: 1, duration: nil, backtrace: nil, log_exception: :full, on_exception_level: nil)
  # Elastic logging: Log when :duration exceeds :min_duration
  # Except if there is an exception when it will always be logged
  if duration
    self.duration = duration
    return false if (duration < min_duration) && exception.nil?
  end

  self.message = message
  self.payload = payload

  if exception
    case log_exception
    when :full
      self.exception = exception
    when :partial
      self.message = "#{message} -- Exception: #{exception.class}: #{exception.message}"
    when nil, :none
      # Log the message without the exception that was raised
    else
      raise(ArgumentError, "Invalid value:#{log_exception.inspect} for argument :log_exception")
    end
    # On exception change the log level
    if on_exception_level
      self.level       = on_exception_level
      self.level_index = SemanticLogger.level_to_index(level)
    end
  end

  if backtrace
    self.backtrace = self.class.cleanse_backtrace(backtrace)
  elsif level_index >= SemanticLogger.backtrace_level_index
    self.backtrace = self.class.cleanse_backtrace
  end

  if metric
    self.metric        = metric
    self.metric_amount = metric_amount
  end

  self.payload = payload if payload && (payload.size > 0)
  true
end

#assign_positional(message = nil, payload = nil, exception = nil) ⇒ Object

Assign positional arguments to this log entry, supplying defaults where applicable

Returns [true|false] whether this log entry should be logged

Example:

logger.info('value', :debug, 0, "hello world")



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# File 'lib/semantic_logger/log.rb', line 118

def assign_positional(message = nil, payload = nil, exception = nil)
  # Exception being logged?
  # Under JRuby a java exception is not a Ruby Exception
  #   Java::JavaLang::ClassCastException.new.is_a?(Exception) => false
  if exception.nil? && payload.nil? && message.respond_to?(:backtrace) && message.respond_to?(:message)
    exception = message
    message   = nil
  elsif exception.nil? && payload && payload.respond_to?(:backtrace) && payload.respond_to?(:message)
    exception = payload
    payload   = nil
  end

  # Add result of block as message or payload if not nil
  if block_given? && (result = yield)
    if result.is_a?(String)
      message = message.nil? ? result : "#{message} -- #{result}"
      assign(message: message, payload: payload, exception: exception)
    elsif message.nil? && result.is_a?(Hash)
      assign(result)
    elsif payload && payload.respond_to?(:merge)
      assign(message: message, payload: payload.merge(result), exception: exception)
    else
      assign(message: message, payload: result, exception: exception)
    end
  else
    assign(message: message, payload: payload, exception: exception)
  end
end

#backtrace_to_s ⇒ Object

Returns [String] the exception backtrace including all of the child / caused by exceptions



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# File 'lib/semantic_logger/log.rb', line 171

def backtrace_to_s
  trace = ''
  each_exception do |exception, i|
    if i == 0
      trace = (exception.backtrace || []).join("\n")
    else
      trace << "\nCause: #{exception.class.name}: #{exception.message}\n#{(exception.backtrace || []).join("\n")}"
    end
  end
  trace
end

#cleansed_message ⇒ Object

Strip the standard Rails colorizing from the logged message



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# File 'lib/semantic_logger/log.rb', line 247

def cleansed_message
  message.to_s.gsub(/(\e(\[([\d;]*[mz]?))?)?/, '').strip
end

#duration_human ⇒ Object

Returns [String] the duration in human readable form



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# File 'lib/semantic_logger/log.rb', line 198

def duration_human
  return nil unless duration
  seconds = duration / 1000
  if seconds >= 86400.0 # 1 day
    "#{(seconds / 86400).to_i}d #{Time.at(seconds).strftime('%-Hh %-Mm')}"
  elsif seconds >= 3600.0 # 1 hour
    Time.at(seconds).strftime('%-Hh %-Mm')
  elsif seconds >= 60.0 # 1 minute
    Time.at(seconds).strftime('%-Mm %-Ss')
  elsif seconds >= 1.0 # 1 second
    "#{'%.3f' % seconds}s"
  else
    duration_to_s
  end
end

#duration_to_s ⇒ Object 



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# File 'lib/semantic_logger/log.rb', line 187

def duration_to_s
  "#{duration.to_i}ms" if duration
end

#each_exception ⇒ Object

Call the block for exception and any nested exception



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# File 'lib/semantic_logger/log.rb', line 149

def each_exception
  # With thanks to https://github.com/bugsnag/bugsnag-ruby/blob/6348306e44323eee347896843d16c690cd7c4362/lib/bugsnag/notification.rb#L81
  depth      = 0
  exceptions = []
  ex         = exception
  while ex != nil && !exceptions.include?(ex) && exceptions.length < MAX_EXCEPTIONS_TO_UNWRAP
    exceptions << ex
    yield(ex, depth)

    depth += 1
    ex    =
      if ex.respond_to?(:cause) && ex.cause
        ex.cause
      elsif ex.respond_to?(:continued_exception) && ex.continued_exception
        ex.continued_exception
      elsif ex.respond_to?(:original_exception) && ex.original_exception
        ex.original_exception
      end
  end
end

#extract_file_and_line(stack, short_name = false) ⇒ Object

Extract the filename and line number from the last entry in the supplied backtrace



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# File 'lib/semantic_logger/log.rb', line 232

def extract_file_and_line(stack, short_name = false)
  match = CALLER_REGEXP.match(stack.first)
  [short_name ? File.basename(match[1]) : match[1], match[2].to_i]
end

#file_name_and_line(short_name = false) ⇒ Object

Returns [String, String] the file_name and line_number from the backtrace supplied in either the backtrace or exception



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# File 'lib/semantic_logger/log.rb', line 239

def file_name_and_line(short_name = false)
  if backtrace || (exception && exception.backtrace)
    stack = backtrace || exception.backtrace
    extract_file_and_line(stack, short_name) if stack && stack.size > 0
  end
end

#formatted_time ⇒ Object

DEPRECATED



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# File 'lib/semantic_logger/log.rb', line 263

def formatted_time
  time.strftime(Formatters::Base::TIME_FORMAT)
end

#has_payload? ⇒ Boolean

Returns [true|false] whether the log entry has a payload

Returns:

  • (Boolean) 


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# File 'lib/semantic_logger/log.rb', line 258

def has_payload?
  !(payload.nil? || (payload.respond_to?(:empty?) && payload.empty?))
end

#level_to_s ⇒ Object

Returns [String] single character upper case log level



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# File 'lib/semantic_logger/log.rb', line 215

def level_to_s
  level.to_s[0..0].upcase
end

#payload_to_s ⇒ Object

Return the payload in text form Returns nil if payload is missing or empty



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# File 'lib/semantic_logger/log.rb', line 253

def payload_to_s
  payload.inspect if has_payload?
end

#process_info(thread_name_length = 30) ⇒ Object

Returns [String] the available process info Example:

18934:thread 23 test_logging.rb:51



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# File 'lib/semantic_logger/log.rb', line 222

def process_info(thread_name_length = 30)
  file, line = file_name_and_line(true)
  file_name  = " #{file}:#{line}" if file

  "#{$$}:#{"%.#{thread_name_length}s" % thread_name}#{file_name}"
end

#set_context(key, value) ⇒ Object

Lazy initializes the context hash and assigns a key value pair.



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# File 'lib/semantic_logger/log.rb', line 276

def set_context(key, value)
  (self.context ||= {})[key] = value
end

#to_h(host = SemanticLogger.host, application = SemanticLogger.application) ⇒ Object

DEPRECATED: Use SemanticLogger::Formatters::Raw



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# File 'lib/semantic_logger/log.rb', line 270

def to_h(host = SemanticLogger.host, application = SemanticLogger.application)
  logger = DeprecatedLogger.new(host, application)
  SemanticLogger::Formatters::Raw.new.call(self, logger)
end