1  import enum
       2  
       3  # After the connection is lost, log warnings after this many write()s.
       4  LOG_THRESHOLD_FOR_CONNLOST_WRITES = 5
       5  
       6  # Seconds to wait before retrying accept().
       7  ACCEPT_RETRY_DELAY = 1
       8  
       9  # Number of stack entries to capture in debug mode.
      10  # The larger the number, the slower the operation in debug mode
      11  # (see extract_stack() in format_helpers.py).
      12  DEBUG_STACK_DEPTH = 10
      13  
      14  # Number of seconds to wait for SSL handshake to complete
      15  # The default timeout matches that of Nginx.
      16  SSL_HANDSHAKE_TIMEOUT = 60.0
      17  
      18  # Number of seconds to wait for SSL shutdown to complete
      19  # The default timeout mimics lingering_time
      20  SSL_SHUTDOWN_TIMEOUT = 30.0
      21  
      22  # Used in sendfile fallback code.  We use fallback for platforms
      23  # that don't support sendfile, or for TLS connections.
      24  SENDFILE_FALLBACK_READBUFFER_SIZE = 1024 * 256
      25  
      26  FLOW_CONTROL_HIGH_WATER_SSL_READ = 256  # KiB
      27  FLOW_CONTROL_HIGH_WATER_SSL_WRITE = 512  # KiB
      28  
      29  # The enum should be here to break circular dependencies between
      30  # base_events and sslproto
      31  class ESC[4;38;5;81m_SendfileMode(ESC[4;38;5;149menumESC[4;38;5;149m.ESC[4;38;5;149mEnum):
      32      UNSUPPORTED = enum.auto()
      33      TRY_NATIVE = enum.auto()
      34      FALLBACK = enum.auto()