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Merge branch 'wip/smcv/issue2087' into 'master'

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Make it easier to filter logging

Closes #2087

See merge request GNOME/glib!1580
This commit is contained in:
Philip Withnall 2020-10-07 13:41:07 +00:00
commit f55b278cc0
4 changed files with 213 additions and 29 deletions
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2
docs/reference/glib/glib-sections.txt
View File

@ -1484,6 +1484,8 @@ g_log_writer_format_fields
g_log_writer_journald
g_log_writer_standard_streams
g_log_writer_default
g_log_writer_default_set_use_stderr
g_log_writer_default_would_drop
<SUBSECTION Private>
g_log_structured_standard

162
glib/gmessages.c
View File

@ -127,7 +127,8 @@
* It is recommended that custom log writer functions re-use the
* `G_MESSAGES_DEBUG` environment variable, rather than inventing a custom one,
* so that developers can re-use the same debugging techniques and tools across
* projects.
* projects. Since GLib 2.68, this can be implemented by dropping messages
* for which g_log_writer_default_would_drop() returns %TRUE.
*
* ## Testing for Messages ## {#testing-for-messages}
*
@ -197,6 +198,7 @@
#include "gstrfuncs.h"
#include "gstring.h"
#include "gpattern.h"
#include "gthreadprivate.h"
#ifdef G_OS_UNIX
#include <unistd.h>
@ -1160,12 +1162,42 @@ static const gchar *log_level_to_color (GLogLevelFlags log_level,
gboolean use_color);
static const gchar *color_reset (gboolean use_color);
static gboolean gmessages_use_stderr = FALSE;
/**
* g_log_writer_default_set_use_stderr:
* @use_stderr: If %TRUE, use `stderr` for log messages that would
* normally have appeared on `stdout`
*
* Configure whether the built-in log functions
* (g_log_default_handler() for the old-style API, and both
* g_log_writer_default() and g_log_writer_standard_streams() for the
* structured API) will output all log messages to `stderr`.
*
* By default, log messages of levels %G_LOG_LEVEL_INFO and
* %G_LOG_LEVEL_DEBUG are sent to `stdout`, and other log messages are
* sent to `stderr`. This is problematic for applications that intend
* to reserve `stdout` for structured output such as JSON or XML.
*
* This function sets global state. It is not thread-aware, and should be
* called at the very start of a program, before creating any other threads
* or creating objects that could create worker threads of their own.
*
* Since: 2.68
*/
void
g_log_writer_default_set_use_stderr (gboolean use_stderr)
{
g_return_if_fail (g_thread_n_created () == 0);
gmessages_use_stderr = use_stderr;
}
static FILE *
mklevel_prefix (gchar level_prefix[STRING_BUFFER_SIZE],
GLogLevelFlags log_level,
gboolean use_color)
{
gboolean to_stdout = TRUE;
gboolean to_stdout = !gmessages_use_stderr;
/* we may not call _any_ GLib functions here */
@ -1442,6 +1474,9 @@ log_level_to_priority (GLogLevelFlags log_level)
static FILE *
log_level_to_file (GLogLevelFlags log_level)
{
if (gmessages_use_stderr)
return stderr;
if (log_level & (G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL |
G_LOG_LEVEL_WARNING | G_LOG_LEVEL_MESSAGE))
return stderr;
@ -2524,7 +2559,9 @@ g_log_writer_journald (GLogLevelFlags log_level,
*
* Format a structured log message and print it to either `stdout` or `stderr`,
* depending on its log level. %G_LOG_LEVEL_INFO and %G_LOG_LEVEL_DEBUG messages
* are sent to `stdout`; all other log levels are sent to `stderr`. Only fields
* are sent to `stdout`, or to `stderr` if requested by
* g_log_writer_default_set_use_stderr();
* all other log levels are sent to `stderr`. Only fields
* which are understood by this function are included in the formatted string
* which is printed.
*
@ -2581,6 +2618,95 @@ log_is_old_api (const GLogField *fields,
g_strcmp0 (fields[0].value, "1") == 0);
}
/*
* Internal version of g_log_writer_default_would_drop(), which can
* read from either a log_domain or an array of fields. This avoids
* having to iterate through the fields if the @log_level is sufficient
* to make the decision.
*/
static gboolean
should_drop_message (GLogLevelFlags log_level,
const char *log_domain,
const GLogField *fields,
gsize n_fields)
{
/* Disable debug message output unless specified in G_MESSAGES_DEBUG. */
if (!(log_level & DEFAULT_LEVELS) && !(log_level >> G_LOG_LEVEL_USER_SHIFT))
{
const gchar *domains;
gsize i;
domains = g_getenv ("G_MESSAGES_DEBUG");
if ((log_level & INFO_LEVELS) == 0 ||
domains == NULL)
return TRUE;
if (log_domain == NULL)
{
for (i = 0; i < n_fields; i++)
{
if (g_strcmp0 (fields[i].key, "GLIB_DOMAIN") == 0)
{
log_domain = fields[i].value;
break;
}
}
}
if (strcmp (domains, "all") != 0 &&
(log_domain == NULL || !strstr (domains, log_domain)))
return TRUE;
}
return FALSE;
}
/**
* g_log_writer_default_would_drop:
* @log_domain: (nullable): log domain
* @log_level: log level, either from #GLogLevelFlags, or a user-defined
* level
*
* Check whether g_log_writer_default() and g_log_default_handler() would
* ignore a message with the given domain and level.
*
* As with g_log_default_handler(), this function drops debug and informational
* messages unless their log domain (or `all`) is listed in the space-separated
* `G_MESSAGES_DEBUG` environment variable.
*
* This can be used when implementing log writers with the same filtering
* behaviour as the default, but a different destination or output format:
*
* |[<!-- language="C" -->
* if (g_log_writer_default_would_drop (log_level, log_domain))
* return G_LOG_WRITER_HANDLED;
* ]|
*
* or to skip an expensive computation if it is only needed for a debugging
* message, and `G_MESSAGES_DEBUG` is not set:
*
* |[<!-- language="C" -->
* if (!g_log_writer_default_would_drop (G_LOG_LEVEL_DEBUG, G_LOG_DOMAIN))
* {
* gchar *result = expensive_computation (my_object);
*
* g_debug ("my_object result: %s", result);
* g_free (result);
* }
* ]|
*
* Returns: %TRUE if the log message would be dropped by GLib's
* default log handlers
* Since: 2.68
*/
gboolean
g_log_writer_default_would_drop (GLogLevelFlags log_level,
const char *log_domain)
{
return should_drop_message (log_level, log_domain, NULL, 0);
}
/**
* g_log_writer_default:
* @log_level: log level, either from #GLogLevelFlags, or a user-defined
@ -2625,31 +2751,8 @@ g_log_writer_default (GLogLevelFlags log_level,
g_return_val_if_fail (fields != NULL, G_LOG_WRITER_UNHANDLED);
g_return_val_if_fail (n_fields > 0, G_LOG_WRITER_UNHANDLED);
/* Disable debug message output unless specified in G_MESSAGES_DEBUG. */
if (!(log_level & DEFAULT_LEVELS) && !(log_level >> G_LOG_LEVEL_USER_SHIFT))
{
const gchar *domains, *log_domain = NULL;
gsize i;
domains = g_getenv ("G_MESSAGES_DEBUG");
if ((log_level & INFO_LEVELS) == 0 ||
domains == NULL)
return G_LOG_WRITER_HANDLED;
for (i = 0; i < n_fields; i++)
{
if (g_strcmp0 (fields[i].key, "GLIB_DOMAIN") == 0)
{
log_domain = fields[i].value;
break;
}
}
if (strcmp (domains, "all") != 0 &&
(log_domain == NULL || !strstr (domains, log_domain)))
return G_LOG_WRITER_HANDLED;
}
if (should_drop_message (log_level, NULL, fields, n_fields))
return G_LOG_WRITER_HANDLED;
/* Mark messages as fatal if they have a level set in
* g_log_set_always_fatal().
@ -3075,7 +3178,8 @@ escape_string (GString *string)
*
* stderr is used for levels %G_LOG_LEVEL_ERROR, %G_LOG_LEVEL_CRITICAL,
* %G_LOG_LEVEL_WARNING and %G_LOG_LEVEL_MESSAGE. stdout is used for
* the rest.
* the rest, unless stderr was requested by
* g_log_writer_default_set_use_stderr().
*
* This has no effect if structured logging is enabled; see
* [Using Structured Logging][using-structured-logging].

6
glib/gmessages.h
View File

@ -242,6 +242,12 @@ GLogWriterOutput g_log_writer_default (GLogLevelFlags log_level,
gsize n_fields,
gpointer user_data);
GLIB_AVAILABLE_IN_2_68
void g_log_writer_default_set_use_stderr (gboolean use_stderr);
GLIB_AVAILABLE_IN_2_68
gboolean g_log_writer_default_would_drop (GLogLevelFlags log_level,
const char *log_domain);
/**
* G_DEBUG_HERE:
*

72
glib/tests/logging.c
View File

@ -124,6 +124,68 @@ test_default_handler_debug (void)
g_log ("foo", G_LOG_LEVEL_DEBUG, "6");
g_log ("bar", G_LOG_LEVEL_DEBUG, "6");
g_log ("baz", G_LOG_LEVEL_DEBUG, "6");
exit (0);
}
static void
test_default_handler_debug_stderr (void)
{
g_log_writer_default_set_use_stderr (TRUE);
g_log_set_default_handler (g_log_default_handler, NULL);
g_setenv ("G_MESSAGES_DEBUG", "all", TRUE);
g_log ("foo", G_LOG_LEVEL_DEBUG, "6");
g_log ("bar", G_LOG_LEVEL_DEBUG, "6");
g_log ("baz", G_LOG_LEVEL_DEBUG, "6");
exit (0);
}
static void
test_default_handler_would_drop (void)
{
g_unsetenv ("G_MESSAGES_DEBUG");
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_ERROR, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_CRITICAL, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_WARNING, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_MESSAGE, "foo"));
g_assert_true (g_log_writer_default_would_drop (G_LOG_LEVEL_INFO, "foo"));
g_assert_true (g_log_writer_default_would_drop (G_LOG_LEVEL_DEBUG, "foo"));
g_assert_false (g_log_writer_default_would_drop (1<<G_LOG_LEVEL_USER_SHIFT, "foo"));
g_setenv ("G_MESSAGES_DEBUG", "bar baz", TRUE);
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_ERROR, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_CRITICAL, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_WARNING, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_MESSAGE, "foo"));
g_assert_true (g_log_writer_default_would_drop (G_LOG_LEVEL_INFO, "foo"));
g_assert_true (g_log_writer_default_would_drop (G_LOG_LEVEL_DEBUG, "foo"));
g_assert_false (g_log_writer_default_would_drop (1<<G_LOG_LEVEL_USER_SHIFT, "foo"));
g_setenv ("G_MESSAGES_DEBUG", "foo bar", TRUE);
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_ERROR, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_CRITICAL, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_WARNING, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_MESSAGE, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_INFO, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_DEBUG, "foo"));
g_assert_false (g_log_writer_default_would_drop (1<<G_LOG_LEVEL_USER_SHIFT, "foo"));
g_setenv ("G_MESSAGES_DEBUG", "all", TRUE);
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_ERROR, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_CRITICAL, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_WARNING, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_MESSAGE, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_INFO, "foo"));
g_assert_false (g_log_writer_default_would_drop (G_LOG_LEVEL_DEBUG, "foo"));
g_assert_false (g_log_writer_default_would_drop (1<<G_LOG_LEVEL_USER_SHIFT, "foo"));
exit (0);
}
@ -170,9 +232,17 @@ test_default_handler (void)
g_test_trap_assert_passed ();
g_test_trap_assert_stdout ("*DEBUG*6*6*6*");
g_test_trap_subprocess ("/logging/default-handler/subprocess/debug-stderr", 0, 0);
g_test_trap_assert_passed ();
g_test_trap_assert_stdout_unmatched ("DEBUG");
g_test_trap_assert_stderr ("*DEBUG*6*6*6*");
g_test_trap_subprocess ("/logging/default-handler/subprocess/0x400", 0, 0);
g_test_trap_assert_passed ();
g_test_trap_assert_stdout ("*LOG-0x400*message7*");
g_test_trap_subprocess ("/logging/default-handler/subprocess/would-drop", 0, 0);
g_test_trap_assert_passed ();
}
static void
@ -578,7 +648,9 @@ main (int argc, char *argv[])
g_test_add_func ("/logging/default-handler/subprocess/bar-info", test_default_handler_bar_info);
g_test_add_func ("/logging/default-handler/subprocess/baz-debug", test_default_handler_baz_debug);
g_test_add_func ("/logging/default-handler/subprocess/debug", test_default_handler_debug);
g_test_add_func ("/logging/default-handler/subprocess/debug-stderr", test_default_handler_debug_stderr);
g_test_add_func ("/logging/default-handler/subprocess/0x400", test_default_handler_0x400);
g_test_add_func ("/logging/default-handler/subprocess/would-drop", test_default_handler_would_drop);
g_test_add_func ("/logging/warnings", test_warnings);
g_test_add_func ("/logging/fatal-log-mask", test_fatal_log_mask);
g_test_add_func ("/logging/set-handler", test_set_handler);