[libvirt] [PATCH 4/5] Consolidate code for parsing the logging environment variables
Daniel P. Berrange
berrange at redhat.com
Thu Aug 6 11:58:43 UTC 2009
On Fri, Jul 31, 2009 at 05:57:42PM -0400, Amy Griffis wrote:
> Add two new functions to the internal API,
> virLogParseDefaultPriority() and virLogSetFromEnv(),
> as was suggested earlier by Cole Robinson.
> ---
>
> qemud/qemud.c | 50 ++++++++++++++++++----------------------------
> src/libvirt.c | 22 +-------------------
> src/libvirt_private.syms | 2 ++
> src/logging.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++
> src/logging.h | 2 ++
> tests/eventtest.c | 16 +++------------
> 6 files changed, 78 insertions(+), 64 deletions(-)
ACK, good to remove this duplicated code
Daniel
>
> diff --git a/qemud/qemud.c b/qemud/qemud.c
> index 65c07d9..e6662e4 100644
> --- a/qemud/qemud.c
> +++ b/qemud/qemud.c
> @@ -2488,7 +2488,6 @@ remoteReadSaslAllowedUsernameList (virConfPtr conf ATTRIBUTE_UNUSED,
> */
> static int
> qemudSetLogging(virConfPtr conf, const char *filename) {
> - char *debugEnv;
> int log_level;
> char *log_filters = NULL;
> char *log_outputs = NULL;
> @@ -2497,9 +2496,18 @@ qemudSetLogging(virConfPtr conf, const char *filename) {
> virLogReset();
>
> /*
> - * look for default logging level first from config file,
> - * then from environment variable and finally from command
> - * line options
> + * Libvirtd's order of precedence is:
> + * cmdline > environment > config
> + *
> + * In order to achieve this, we must process configuration in
> + * different order for the log level versus the filters and
> + * outputs. Because filters and outputs append, we have to look at
> + * the environment first and then only check the config file if
> + * there was no result from the environment. The default output is
> + * then applied only if there was no setting from either of the
> + * first two. Because we don't have a way to determine if the log
> + * level has been set, we must process variables in the opposite
> + * order, each one overriding the previous.
> */
> /*
> * GET_CONF_INT returns 0 when there is no log_level setting in
> @@ -2511,38 +2519,13 @@ qemudSetLogging(virConfPtr conf, const char *filename) {
> if (log_level != 0)
> virLogSetDefaultPriority(log_level);
>
> - debugEnv = getenv("LIBVIRT_DEBUG");
> - if (debugEnv && *debugEnv) {
> - if (STREQ(debugEnv, "1") || STREQ(debugEnv, "debug"))
> - virLogSetDefaultPriority(VIR_LOG_DEBUG);
> - else if (STREQ(debugEnv, "2") || STREQ(debugEnv, "info"))
> - virLogSetDefaultPriority(VIR_LOG_INFO);
> - else if (STREQ(debugEnv, "3") || STREQ(debugEnv, "warning"))
> - virLogSetDefaultPriority(VIR_LOG_WARN);
> - else if (STREQ(debugEnv, "4") || STREQ(debugEnv, "error"))
> - virLogSetDefaultPriority(VIR_LOG_ERROR);
> - else
> - VIR_WARN0(_("Ignoring invalid log level setting."));
> - }
> -
> - if ((verbose) && (virLogGetDefaultPriority() > VIR_LOG_INFO))
> - virLogSetDefaultPriority(VIR_LOG_INFO);
> -
> - debugEnv = getenv("LIBVIRT_LOG_FILTERS");
> - if (debugEnv && *debugEnv)
> - virLogParseFilters(strdup(debugEnv));
> + virLogSetFromEnv();
>
> if (virLogGetNbFilters() == 0) {
> GET_CONF_STR (conf, filename, log_filters);
> virLogParseFilters(log_filters);
> }
>
> - /* there is no default filters */
> -
> - debugEnv = getenv("LIBVIRT_LOG_OUTPUTS");
> - if (debugEnv && *debugEnv)
> - virLogParseOutputs(strdup(debugEnv));
> -
> if (virLogGetNbOutputs() == 0) {
> GET_CONF_STR (conf, filename, log_outputs);
> virLogParseOutputs(log_outputs);
> @@ -2566,6 +2549,13 @@ qemudSetLogging(virConfPtr conf, const char *filename) {
> virLogParseOutputs(tmp);
> VIR_FREE(tmp);
> }
> +
> + /*
> + * Command line override for --verbose
> + */
> + if ((verbose) && (virLogGetDefaultPriority() > VIR_LOG_INFO))
> + virLogSetDefaultPriority(VIR_LOG_INFO);
> +
> ret = 0;
>
> free_and_fail:
> diff --git a/src/libvirt.c b/src/libvirt.c
> index 9e96410..19bffb1 100644
> --- a/src/libvirt.c
> +++ b/src/libvirt.c
> @@ -262,7 +262,6 @@ winsock_init (void)
> int
> virInitialize(void)
> {
> - char *debugEnv;
> if (initialized)
> return(0);
>
> @@ -273,26 +272,7 @@ virInitialize(void)
> virRandomInitialize(time(NULL) ^ getpid()))
> return -1;
>
> - debugEnv = getenv("LIBVIRT_DEBUG");
> - if (debugEnv && *debugEnv) {
> - if (STREQ(debugEnv, "1") || STREQ(debugEnv, "debug"))
> - virLogSetDefaultPriority(VIR_LOG_DEBUG);
> - else if (STREQ(debugEnv, "2") || STREQ(debugEnv, "info"))
> - virLogSetDefaultPriority(VIR_LOG_INFO);
> - else if (STREQ(debugEnv, "3") || STREQ(debugEnv, "warning"))
> - virLogSetDefaultPriority(VIR_LOG_WARN);
> - else if (STREQ(debugEnv, "4") || STREQ(debugEnv, "error"))
> - virLogSetDefaultPriority(VIR_LOG_ERROR);
> - else
> - VIR_WARN0(_("Ignoring invalid log level setting."));
> - }
> - debugEnv = getenv("LIBVIRT_LOG_FILTERS");
> - if (debugEnv && *debugEnv)
> - virLogParseFilters(debugEnv);
> -
> - debugEnv = getenv("LIBVIRT_LOG_OUTPUTS");
> - if (debugEnv && *debugEnv)
> - virLogParseOutputs(debugEnv);
> + virLogSetFromEnv();
>
> DEBUG0("register drivers");
>
> diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
> index 487585c..f20e5ce 100644
> --- a/src/libvirt_private.syms
> +++ b/src/libvirt_private.syms
> @@ -217,8 +217,10 @@ virLogGetNbFilters;
> virLogGetNbOutputs;
> virLogGetDefaultPriority;
> virLogSetDefaultPriority;
> +virLogSetFromEnv;
> virLogDefineFilter;
> virLogDefineOutput;
> +virLogParseDefaultPriority;
> virLogParseFilters;
> virLogParseOutputs;
> virLogStartup;
> diff --git a/src/logging.c b/src/logging.c
> index aad4b50..b2cf0bf 100644
> --- a/src/logging.c
> +++ b/src/logging.c
> @@ -829,3 +829,53 @@ int virLogGetNbFilters(void) {
> int virLogGetNbOutputs(void) {
> return (virLogNbOutputs);
> }
> +
> +/**
> + * virLogParseDefaultPriority:
> + * @priority: string defining the desired logging level
> + *
> + * Parses and sets the default log priority level. It can take a string or
> + * number corresponding to the following levels:
> + * 1: DEBUG
> + * 2: INFO
> + * 3: WARNING
> + * 4: ERROR
> + *
> + * Returns the parsed log level or -1 on error.
> + */
> +int virLogParseDefaultPriority(const char *priority) {
> + int ret = -1;
> +
> + if (STREQ(priority, "1") || STREQ(priority, "debug"))
> + ret = virLogSetDefaultPriority(VIR_LOG_DEBUG);
> + else if (STREQ(priority, "2") || STREQ(priority, "info"))
> + ret = virLogSetDefaultPriority(VIR_LOG_INFO);
> + else if (STREQ(priority, "3") || STREQ(priority, "warning"))
> + ret = virLogSetDefaultPriority(VIR_LOG_WARN);
> + else if (STREQ(priority, "4") || STREQ(priority, "error"))
> + ret = virLogSetDefaultPriority(VIR_LOG_ERROR);
> + else
> + VIR_WARN0(_("Ignoring invalid log level setting"));
> +
> + return ret;
> +}
> +
> +/**
> + * virLogSetFromEnv:
> + *
> + * Sets virLogDefaultPriority, virLogFilters and virLogOutputs based on
> + * environment variables.
> + */
> +void virLogSetFromEnv(void) {
> + char *debugEnv;
> +
> + debugEnv = getenv("LIBVIRT_DEBUG");
> + if (debugEnv && *debugEnv)
> + virLogParseDefaultPriority(debugEnv);
> + debugEnv = getenv("LIBVIRT_LOG_FILTERS");
> + if (debugEnv && *debugEnv)
> + virLogParseFilters(strdup(debugEnv));
> + debugEnv = getenv("LIBVIRT_LOG_OUTPUTS");
> + if (debugEnv && *debugEnv)
> + virLogParseOutputs(strdup(debugEnv));
> +}
> diff --git a/src/logging.h b/src/logging.h
> index c8698e5..8b2b84c 100644
> --- a/src/logging.h
> +++ b/src/logging.h
> @@ -109,6 +109,7 @@ extern int virLogGetNbFilters(void);
> extern int virLogGetNbOutputs(void);
> extern int virLogGetDefaultPriority(void);
> extern int virLogSetDefaultPriority(int priority);
> +extern void virLogSetFromEnv(void);
> extern int virLogDefineFilter(const char *match, int priority, int flags);
> extern int virLogDefineOutput(virLogOutputFunc f, virLogCloseFunc c,
> void *data, int priority, int flags);
> @@ -120,6 +121,7 @@ extern int virLogDefineOutput(virLogOutputFunc f, virLogCloseFunc c,
> extern int virLogStartup(void);
> extern int virLogReset(void);
> extern void virLogShutdown(void);
> +extern int virLogParseDefaultPriority(const char *priority);
> extern int virLogParseFilters(const char *filters);
> extern int virLogParseOutputs(const char *output);
> extern void virLogMessage(const char *category, int priority,
> diff --git a/tests/eventtest.c b/tests/eventtest.c
> index 05fe3f3..d25381d 100644
> --- a/tests/eventtest.c
> +++ b/tests/eventtest.c
> @@ -272,19 +272,9 @@ mymain(int argc, char **argv)
> if (virThreadInitialize() < 0)
> return EXIT_FAILURE;
> char *debugEnv = getenv("LIBVIRT_DEBUG");
> - if (debugEnv && *debugEnv) {
> - if (STREQ(debugEnv, "1") || STREQ(debugEnv, "debug"))
> - virLogSetDefaultPriority(VIR_LOG_DEBUG);
> - else if (STREQ(debugEnv, "2") || STREQ(debugEnv, "info"))
> - virLogSetDefaultPriority(VIR_LOG_INFO);
> - else if (STREQ(debugEnv, "3") || STREQ(debugEnv, "warning"))
> - virLogSetDefaultPriority(VIR_LOG_WARN);
> - else if (STREQ(debugEnv, "4") || STREQ(debugEnv, "error"))
> - virLogSetDefaultPriority(VIR_LOG_ERROR);
> - else {
> - fprintf(stderr, "Invalid log level setting.\n");
> - return EXIT_FAILURE;
> - }
> + if (debugEnv && *debugEnv && (virLogParseDefaultPriority(debugEnv) == -1)) {
> + fprintf(stderr, "Invalid log level setting.\n");
> + return EXIT_FAILURE;
> }
>
> virEventInit();
>
> --
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