module GLib

Constants

GLIB_TO_SEVERITY: map glib levels to Logger::Severity
G_FREE: save the FFI::Function that attach will return … we can use it directly as a param for callbacks
LOG_FLAG_FATAL
LOG_FLAG_RECURSION: log flags
LOG_HANDLER: module-level, so it’s not GCd away
LOG_LEVEL_CRITICAL
LOG_LEVEL_DEBUG
LOG_LEVEL_ERROR: GLib log levels
LOG_LEVEL_INFO
LOG_LEVEL_MESSAGE
LOG_LEVEL_WARNING

Attributes

logger[RW]

Public Class Methods

remove_log_handler() click to toggle source

# File lib/vips.rb, line 90
def self.remove_log_handler
  if @glib_log_handler_id != 0 && @glib_log_domain
    g_log_remove_handler @glib_log_domain, @glib_log_handler_id
    @glib_log_handler_id = nil
  end
end

set_log_domain(domain) click to toggle source

# File lib/vips.rb, line 97
def self.set_log_domain domain
  GLib::remove_log_handler

  @glib_log_domain = domain

  # forward all glib logging output from this domain to a Ruby logger
  if @glib_log_domain
    # disable this feature for now
    #
    # libvips background worker threads can issue warnings, and
    # since the main thread is blocked waiting for libvips to come back
    # from an ffi call, you get a deadlock on the GIL
    #
    # to fix this, we need a way for g_log() calls from libvips workers
    # to be returned via the main thread
    #

    #             @glib_log_handler_id = g_log_set_handler @glib_log_domain,
    #                 LOG_LEVEL_DEBUG |
    #                 LOG_LEVEL_INFO |
    #                 LOG_LEVEL_MESSAGE |
    #                 LOG_LEVEL_WARNING |
    #                 LOG_LEVEL_ERROR |
    #                 LOG_LEVEL_CRITICAL |
    #                 LOG_FLAG_FATAL | LOG_FLAG_RECURSION,
    #                 LOG_HANDLER, nil

    # we must remove any handlers on exit, since libvips may log stuff
    # on shutdown and we don't want LOG_HANDLER to be invoked
    # after Ruby has gone
    at_exit {
      GLib::remove_log_handler
    }
  end
end