Class: Awful::CloudWatchLogs

Inherits:
Cli show all
Defined in:
lib/awful/cloudwatch_logs.rb

Instance Method Summary collapse

Methods inherited from Cli

#initialize

Constructor Details

This class inherits a constructor from Awful::Cli

Instance Method Details

#create(name) ⇒ Object 



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# File 'lib/awful/cloudwatch_logs.rb', line 48

def create(name)
  logs.create_log_group(log_group_name: name)
end

#delete(name) ⇒ Object 



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# File 'lib/awful/cloudwatch_logs.rb', line 53

def delete(name)
  logs.delete_log_group(log_group_name: name)
end

#events(group, nth = 0) ⇒ Object 



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# File 'lib/awful/cloudwatch_logs.rb', line 109

def events(group, nth = 0)
  opt = options.dup
  opt[:stream] ||= latest_stream(group, nth).log_stream_name # use latest stream if none requested

  ## magical tail option returns up to requested number of last events
  if opt[:tail]
    opt[:head]  = false
    opt[:pages] = 1
    opt[:limit] = opt[:tail]
  end

  next_token = nil
  events = []
  pages = 0
  loop do
    response = logs.get_log_events(
      log_group_name:  group,
      log_stream_name: opt[:stream],
      start_from_head: opt[:head],
      limit:           opt[:limit],
      next_token:      next_token,
    )

    break if response.events.count == 0 # break on no results as token does not get to nil
    events = events + response.events

    pages += 1
    break if pages >= opt[:pages]

    next_token = response.next_backward_token
    break if next_token.nil? # not sure if this is ever set to nil
  end

  events.output do |ev|
    if options[:long]
      print_table ev.map { |e| [human_time(e.timestamp), e.message] }
    else
      puts ev.map(&:message)
    end
  end
end

#filter(group, *streams) ⇒ Object 



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# File 'lib/awful/cloudwatch_logs.rb', line 155

def filter(group, *streams)
  start_time = options[:start] ? Time.parse(options[:start]).to_i*1000 : nil
  end_time   = options[:end]   ? Time.parse(options[:end]).to_i*1000   : nil
  token = nil
  loop do
    resp = logs.filter_log_events(
      log_group_name: group,
      log_stream_names: streams.empty? ? nil : streams,
      next_token: token,
      start_time: start_time,
      end_time: end_time,
      filter_pattern: options[:pattern],
    )
    resp.events.each do |e|
      time   = set_color(human_time(e.timestamp).utc, :green)
      stream = set_color(e.log_stream_name, :blue)
      puts("#{time}  #{stream}  #{e.message}")
    end
    token = resp.next_token
    break unless token
  end
end

#head(group, stream) ⇒ Object 



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# File 'lib/awful/cloudwatch_logs.rb', line 212

def head(group, stream)
  out = options[:timestamp] ? ->(e) { puts("#{set_color(human_time(e.timestamp).utc, :green)}  #{e.message}") } : ->(e) { puts e.message }

  logs.get_log_events(
    log_group_name: group,
    log_stream_name: stream,
    limit: options[:numlines],
    start_from_head: true,
  ).events.each do |e|
    out.call(e)
  end
end

#latest(group, n = 0) ⇒ Object 



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# File 'lib/awful/cloudwatch_logs.rb', line 96

def latest(group, n = 0)
  latest_stream(group, n).output do |stream|
    puts stream.log_stream_name
  end
end

#ls(prefix = nil) ⇒ Object 



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# File 'lib/awful/cloudwatch_logs.rb', line 28

def ls(prefix = nil)
  paginate(:log_groups) do |token|
    logs.describe_log_groups(log_group_name_prefix: prefix, next_token: token)
  end.output do |groups|
    if options[:long]
      print_table groups.map { |group|
        [
          group.log_group_name,
          group.retention_in_days,
          human_time(group.creation_time),
          group.stored_bytes,
        ]
      }
    else
      puts groups.map(&:log_group_name)
    end
  end
end

#streams(group, prefix = nil) ⇒ Object 



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# File 'lib/awful/cloudwatch_logs.rb', line 61

def streams(group, prefix = nil)
  paginate(:log_streams) do |token|
    logs.describe_log_streams(
      log_group_name: group,
      log_stream_name_prefix: prefix,
      order_by: options[:alpha] ? 'LogStreamName' : 'LastEventTime',
      descending: (not options[:alpha]), # want desc order if by time for most recent first
      limit: options[:limit],
      next_token: token,
    )
  end.output do |streams|
    if options[:long]
      print_table streams.map { |s|
        [ s.log_stream_name, human_time(s.creation_time), human_time(s.last_event_timestamp) ]
      }
    else
      puts streams.map(&:log_stream_name)
    end
  end
end

#tail(group, stream) ⇒ Object 



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# File 'lib/awful/cloudwatch_logs.rb', line 183

def tail(group, stream)
  trap('SIGINT', 'EXIT')    # expect to exit with ctrl-c

  ## how to print each line
  out = if options[:timestamp]
    ->(e) { puts("#{set_color(human_time(e.timestamp).utc, :green)}  #{e.message}") }
  else
    ->(e) { puts e.message }
  end

  token = nil
  loop do
    resp = logs.get_log_events(
      log_group_name: group,
      log_stream_name: stream,
      limit: options[:numlines],
      next_token: token,
    )
    resp.events.each do |e|
      out.call(e)
    end
    token = resp.next_forward_token
    options[:follow] ? sleep(options[:sleep]) : break
  end
end