[PATCH] syslog support to xentoollog

[Gihan Munasinghe <GMunasinghe@flexiant.com>]

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Guys

See the attach patch, this implements a xentoollog consumer that can log 
in to syslog

Following are the changes

xentoollog.h:
1) Generic, xtl_logger_set_minlevel and xtl_logger_adjust_flags 
functions to be called from outside,
2) Making logger flags to be more generic
3) Change the struct xentool_logger, each logger will implement its own 
"set_minlevel" and "adjust_flags"  which will be invoked by 
xtl_logger_set_minlevel and xtl_logger_adjust_flags generic functions.
4) New function prototype to create a xentool_logger_syslogger

Going forward I would like to suggest that xentoollog.h file should only 
have generic functions, except for xtl_createlogger_* functions. Logger 
type specific function should not be included(e.g 
xtl_stdiostream_set_minlevel ) this will make sure outside code can 
switch from one logger to another (from stdiologger to syslogger vice 
versa) with out breaking the code.

xtl_core.c:
1) Implementation of xtl_logger_set_minlevel and xtl_logger_adjust_flags 
functions.

xtl_logger_syslog.c :
New logger implementation to log in to syslog.


I did some testing by changing the code in xl. This seems to work, but I 
would really like if more people can test this.
Also could someone look @ the syslogger_progress function and add any 
extra bits if needed, I did a very basic implementation of this.  

Signed-off-by : Gihan Munasinghe <GMunasinghe@flexiant.com>


Thanks
Gihan

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diff -Nuar a/tools/libxc/Makefile b/tools/libxc/Makefile
--- a/tools/libxc/Makefile	2010-06-01 23:32:43.000000000 +0100
+++ b/tools/libxc/Makefile	2010-06-03 22:56:42.000000000 +0100
@@ -29,6 +29,7 @@
 CTRL_SRCS-y       += xc_memshr.c
 CTRL_SRCS-y       += xtl_core.c
 CTRL_SRCS-y       += xtl_logger_stdio.c
+CTRL_SRCS-y       += xtl_logger_syslog.c
 CTRL_SRCS-$(CONFIG_X86) += xc_pagetab.c
 CTRL_SRCS-$(CONFIG_Linux) += xc_linux.c
 CTRL_SRCS-$(CONFIG_SunOS) += xc_solaris.c
diff -Nuar a/tools/libxc/xentoollog.h b/tools/libxc/xentoollog.h
--- a/tools/libxc/xentoollog.h	2010-06-01 23:32:43.000000000 +0100
+++ b/tools/libxc/xentoollog.h	2010-06-04 22:49:54.000000000 +0100
@@ -45,16 +45,28 @@
           * will always be called with done==0 for each new
           * context/doing_what */;
     void (*destroy)(struct xentoollog_logger *logger);
+    void (*set_minlevel)(xentoollog_logger *logger,
+                                  xentoollog_level min_level);
+    void (*adjust_flags)(xentoollog_logger *logger,
+                                  unsigned set_flags, unsigned clear_flags);
     /* each logger can put its necessary data here */
+
 };
 
 
 /*---------- facilities for consuming log messages ----------*/
 
+//-- Should be depricated not generic enough --//
 #define XTL_STDIOSTREAM_SHOW_PID      01u
 #define XTL_STDIOSTREAM_SHOW_DATE     02u
 #define XTL_STDIOSTREAM_HIDE_PROGRESS 04u
 
+//---Plase use the following as the new flags when creating and setting loggers
+#define XTL_SHOW_PID      01u
+#define XTL_SHOW_DATE     02u
+#define XTL_HIDE_PROGRESS 04u
+
+
 typedef struct xentoollog_logger_stdiostream  xentoollog_logger_stdiostream;
 
 xentoollog_logger_stdiostream *xtl_createlogger_stdiostream
@@ -62,15 +74,47 @@
     /* may return 0 if malloc fails, in which case error was logged */
     /* destroy on this logger does not close the file */
 
+//This method need to be depricated use more generic xtl_logger_set_minlevel method insted
 void xtl_stdiostream_set_minlevel(xentoollog_logger_stdiostream*,
                                   xentoollog_level min_level);
+
+//This method need to be depricated use more generic xtl_logger_adjust_flags method insted.
 void xtl_stdiostream_adjust_flags(xentoollog_logger_stdiostream*,
                                   unsigned set_flags, unsigned clear_flags);
   /* if set_flags and clear_flags overlap, set_flags takes precedence */
 
+
+typedef struct xentoollog_logger_syslogger xentoollog_logger_syslogger;
+
+/**
+Create a logger that will log to syslog 
+syslog_facility is the facilities that are in the sys/syslog.h
+edit /etc/syslog.conf file to indicate where you wansyslog to send log data
+
+example config:- 
+Add the following line in to /etc/syslog.conf
+ 
+local1.*       /var/log/xenlog
+restart syslogd
+When setting up the logger give LOG_LOCAL1 as the logging facility
+now all your logs will appear in /var/log/xenlog file 
+
+Please look more in to syslog and syslogng configs if you want to send the data in to remote logging servers 
+
+NOTE: XTL_SHOW_DATE flag will not take any effect as syslogd will put the date by default
+**/
+xentoollog_logger_syslogger *xtl_createlogger_syslogger
+        (int syslog_facility, xentoollog_level min_level, unsigned flags);
+
 void xtl_logger_destroy(struct xentoollog_logger *logger /* 0 is ok */);
 
 
+void xtl_logger_set_minlevel(struct xentoollog_logger *logger,xentoollog_level min_level);
+
+void xtl_logger_adjust_flags(struct xentoollog_logger *logger,
+                                  unsigned set_flags, unsigned clear_flags);
+
+
 /*---------- facilities for generating log messages ----------*/
 
 void xtl_logv(struct xentoollog_logger *logger,
@@ -104,6 +148,8 @@
     (buffer).vtable.vmessage = LOGGER##_vmessage;                       \
     (buffer).vtable.progress = LOGGER##_progress;                       \
     (buffer).vtable.destroy  = LOGGER##_destroy;                        \
+    (buffer).vtable.set_minlevel = LOGGER##_set_minlevel;                \
+    (buffer).vtable.adjust_flags = LOGGER##_adjust_flags;                \
                                                                         \
     new_consumer = malloc(sizeof(*new_consumer));                       \
     if (!new_consumer) {                                                \
diff -Nuar a/tools/libxc/xtl_core.c b/tools/libxc/xtl_core.c
--- a/tools/libxc/xtl_core.c	2010-06-01 23:32:43.000000000 +0100
+++ b/tools/libxc/xtl_core.c	2010-06-04 21:34:55.000000000 +0100
@@ -63,7 +63,23 @@
     logger->progress(logger, context, doing_what, percent, done, total);
 }
 
+void xtl_logger_set_minlevel(struct xentoollog_logger *logger,
+                             xentoollog_level min_level){
+    if (!logger || !logger->set_minlevel) return; 
+
+    logger->set_minlevel(logger,min_level);
+}
+    
+void xtl_logger_adjust_flags(struct xentoollog_logger *logger,
+                             unsigned set_flags, unsigned clear_flags){
+    if (!logger || !logger->adjust_flags) return; 
+
+    logger->adjust_flags(logger,set_flags,clear_flags);
+}
+
+
 void xtl_logger_destroy(struct xentoollog_logger *logger) {
-    if (!logger) return;
+    if (!logger || !logger->destroy) return;
+
     logger->destroy(logger);
 }
diff -Nuar a/tools/libxc/xtl_logger_stdio.c b/tools/libxc/xtl_logger_stdio.c
--- a/tools/libxc/xtl_logger_stdio.c	2010-06-01 23:32:43.000000000 +0100
+++ b/tools/libxc/xtl_logger_stdio.c	2010-06-04 21:44:52.000000000 +0100
@@ -124,6 +124,20 @@
     lg->flags = new_flags;
 }
 
+static void stdiostream_set_minlevel(struct xentoollog_logger *logger_in,
+                                  xentoollog_level min_level){
+
+    xentoollog_logger_stdiostream *lg = (void*)logger_in;
+    xtl_stdiostream_set_minlevel(lg,min_level);
+}
+
+static void stdiostream_adjust_flags(struct xentoollog_logger *logger_in,
+                                  unsigned set_flags, unsigned clear_flags) {
+
+    xentoollog_logger_stdiostream *lg = (void*)logger_in;
+    xtl_stdiostream_adjust_flags(lg,set_flags,clear_flags); 
+}
+
 xentoollog_logger_stdiostream *xtl_createlogger_stdiostream
         (FILE *f, xentoollog_level min_level, unsigned flags) {
     xentoollog_logger_stdiostream newlogger;
diff -Nuar a/tools/libxc/xtl_logger_syslog.c b/tools/libxc/xtl_logger_syslog.c
--- a/tools/libxc/xtl_logger_syslog.c	1970-01-01 01:00:00.000000000 +0100
+++ b/tools/libxc/xtl_logger_syslog.c	2010-06-05 00:52:09.000000000 +0100
@@ -0,0 +1,152 @@
+/**
+*xtl_logger_syslog.c
+*
+*xentool log comsumer implementation, that will log into syslog
+*
+*Copyright (c) 2010 Flexiant Ltd. 
+**/
+#include "xentoollog.h"
+
+#include <sys/syslog.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <pthread.h>
+
+typedef struct _log_map{
+    xentoollog_level xen_log;
+    int syslog_level;
+}LOG_MAP;
+
+LOG_MAP log_mappings[] = 
+    {
+        {XTL_DEBUG,LOG_DEBUG}, 
+        {XTL_VERBOSE,LOG_DEBUG},
+        {XTL_DETAIL,LOG_DEBUG},
+        {XTL_PROGRESS,LOG_DEBUG},
+        {XTL_INFO,LOG_INFO},
+        {XTL_NOTICE,LOG_NOTICE},
+        {XTL_WARN,LOG_WARNING},
+        {XTL_ERROR,LOG_ERR},
+        {XTL_CRITICAL,LOG_CRIT}
+    };
+
+int maptable_len = sizeof(log_mappings)/sizeof(LOG_MAP);
+
+
+struct xentoollog_logger_syslogger{ 
+    xentoollog_logger vtable;
+    pthread_mutex_t mutex; //syslog in not thread safe at all therefore we need a lock before issue a syslog call 
+    unsigned flags;
+};
+
+/**
+Returns mapping syslog level for a given xentoollog_level
+**/
+static int get_syslog_level(xentoollog_level level){
+    int i; 
+    for (i=0; i<maptable_len; i++){
+        LOG_MAP map = log_mappings[i]; 
+        if (map.xen_log==level){
+           return map.syslog_level;
+        }
+    }
+    // If a mapping is not found use LOG_INFO as default
+    return LOG_INFO;
+}
+
+
+static void syslogger_vmessage(xentoollog_logger *logger_in,
+                                 xentoollog_level level,
+                                 int errnoval,
+                                 const char *context,
+                                 const char *format,
+                                 va_list al) {
+    char *buffer;
+    xentoollog_logger_syslogger *lg = (void*)logger_in;
+    
+    buffer = (char *)calloc(1024,sizeof(char));
+    if (context && (lg->flags & XTL_SHOW_PID)){
+       char *new_format = (char *) calloc(13+strlen(context)+10,sizeof(char));
+       sprintf(new_format,"[%s] [%lu] : ",context,(unsigned long)getpid());
+       strcat(buffer,new_format);
+       free(new_format);
+       
+    }else if(context){
+       char *new_format = (char *) calloc(7+strlen(context),sizeof(char));
+       sprintf(new_format,"[%s] : ",context);
+       strcat(buffer,new_format);
+       free(new_format);
+
+    }else if(lg->flags & XTL_SHOW_PID){
+       char *new_format = (char *) calloc(18,sizeof(char));
+       sprintf(new_format,"[%lu] : ",(unsigned long)getpid());
+       strcat(buffer,new_format);
+       free(new_format);
+
+    }
+  
+    if (errnoval >= 0){
+       char *new_format = (char *) calloc(100,sizeof(char));
+       sprintf(new_format,"[%s] : ",strerror(errnoval));
+       strcat(buffer,new_format);
+       free(new_format);
+    }
+ 
+    strcat(buffer,format);
+
+    pthread_mutex_lock(&lg->mutex);
+    vsyslog(get_syslog_level(level),buffer,al);
+    pthread_mutex_unlock(&lg->mutex);
+
+    free(buffer);
+}
+
+static void syslogger_progress(struct xentoollog_logger *logger_in,
+                                 const char *context,
+                                 const char *doing_what, int percent,
+                                 unsigned long done, unsigned long total){
+    xentoollog_logger_syslogger *lg = (void *)logger_in;
+    
+    pthread_mutex_lock(&lg->mutex);
+    syslog(get_syslog_level(XTL_PROGRESS),"%s%s" "%s: %lu/%lu  %3d%%",
+                          context?context:"", context?": ":"",
+                          doing_what, done, total, percent);
+    pthread_mutex_unlock(&lg->mutex);
+}
+
+static void syslogger_destroy(struct xentoollog_logger *logger_in) {
+    xentoollog_logger_syslogger *lg = (void*)logger_in;
+    closelog();
+    pthread_mutex_destroy(&lg->mutex);
+    free(lg);
+}
+
+static void syslogger_set_minlevel(struct xentoollog_logger *logger_in,
+                                  xentoollog_level minlevel){
+    setlogmask(LOG_UPTO(get_syslog_level(minlevel)));
+}
+
+static void syslogger_adjust_flags(struct xentoollog_logger *logger_in,
+                                  unsigned set_flags, unsigned clear_flags){
+    xentoollog_logger_syslogger *lg = (void *)logger_in;
+    unsigned new_flags = (lg->flags & ~clear_flags) | set_flags;
+    lg->flags = new_flags;
+}
+
+xentoollog_logger_syslogger *xtl_createlogger_syslogger
+        (int syslog_facility, xentoollog_level min_level, unsigned flags) {
+
+    xentoollog_logger_syslogger newlogger;
+    newlogger.flags = flags;
+    pthread_mutex_init(&newlogger.mutex,NULL);;
+
+    openlog("",LOG_CONS | LOG_NDELAY,syslog_facility);
+    setlogmask(LOG_UPTO(get_syslog_level(min_level)));
+
+    return XTL_NEW_LOGGER(syslogger, newlogger);
+}
+

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