Prepare for having per destination module log levels

src/logging.c

@@ -9,6 +9,11 @@
 #include "ucore/logging.h"
 
 
+//used to realise per destination settings
+struct uc_log_module_setting {
+    int log_level;
+};
+
 struct uc_log_destination {
     SLIST_ENTRY(uc_log_destination) entry;
     enum UC_LOG_DESTINATION dest_type;
@@ -16,6 +21,7 @@ struct uc_log_destination {
     int log_level;
     //Whether to log the source file name and line number 
     int log_location;
+    struct uc_log_module_setting *module_settings;
     union {
         //for syslog openlog()
         struct {
@@ -95,6 +101,22 @@ static inline int uc_ll_2_syslog(enum UC_LOG_LEVEL l)
     return LOG_INFO;
 }
 
+static int uc_log_init_settings(struct uc_log_destination *dest)
+{
+    int i;
+
+    dest->module_settings = calloc(g_modules.cnt, sizeof *dest->module_settings);
+    if (dest->module_settings == NULL) {
+        return -1;
+    }
+
+    for (i = 0; i < g_modules.cnt; i++) {
+        dest->module_settings[i].log_level = g_modules.mods[i].log_level;
+    }
+
+    return 0;
+}
+
 struct uc_log_destination *uc_log_new_stderr(int log_level, int log_location)
 {
     struct uc_log_destination *dest = calloc(1, sizeof *dest);
@@ -102,6 +124,11 @@ struct uc_log_destination *uc_log_new_stderr(int log_level, int log_location)
     if(dest == NULL)
         return NULL;
 
+    if (uc_log_init_settings(dest) != 0) {
+        free(dest);
+        return NULL;
+    }
+
    dest->dest_type = UC_LDEST_STDERR;
    dest->type.file.file = stderr;
    dest->log_level = log_level;;
@@ -118,9 +145,15 @@ struct uc_log_destination *uc_log_new_syslog(const char *ident, int facility, in
     if (dest == NULL)
         return NULL;
 
+    if (uc_log_init_settings(dest) != 0) {
+        free(dest);
+        return NULL;
+    }
+
     //copy the ident - though it's unused inside the struct for now
     id = strdup(ident);
     if (id == NULL) {
+        free(dest->module_settings);
         free(dest);
         return NULL;
     }
@@ -145,14 +178,21 @@ struct uc_log_destination *uc_log_new_file(const char *filename, int log_level,
     if (dest == NULL)
         return NULL;
 
+    if (uc_log_init_settings(dest) != 0) {
+        free(dest);
+        return NULL;
+    }
+
     name = strdup(filename);
     if (name == NULL) {
+       free(dest->module_settings);
        free(dest);
        return NULL;
     }
 
     f = fopen(filename, "a"); 
     if (f == NULL) {
+       free(dest->module_settings);
        free(name);
        free(dest);
        return NULL;
@@ -245,6 +285,7 @@ void uc_log_delete_destination(struct uc_log_destination *dest)
             free(dest->type.file.file_name);
             break;
     }
+    free(dest->module_settings);
 
     free(dest);
 
@@ -412,43 +453,51 @@ void uc_logf(int log_level, int module, int raw,
     else 
         log_module = &g_unknown_module;
     
-    //Check if the module should not be logged
-    if (log_level < log_module->log_level)
-        goto out;
-
     //do logging for each destination
     SLIST_FOREACH(dest, &g_destinations, entry) {
         va_list apc;
+        int module_log_level;
 
-        if (log_level >= dest->log_level) {
-            const struct uc_log_args args = {
-                .dest = dest,
-                .module = log_module,
-                .log_level = log_level,
-                .file = file,
-                .line = line,
-                .raw = raw
-            }; 
 
-            //log func will mess with the va_list,
-            //so make a copy
-            va_copy(apc, ap);
+        //destnation level
+        if (log_level < dest->log_level)
+            continue;
 
-            switch (dest->dest_type) {
-                case UC_LDEST_SYSLOG:
-                    uc_vlog_syslog(&args, fmt, apc);
-                    break;
-                case UC_LDEST_STDERR:
-                case UC_LDEST_FILE:
-                    uc_vlog_file(&args, fmt, apc);
-                    break;
-            }
+        //individual module level
+        if (module >= 0 && module < g_modules.cnt)
+            module_log_level = dest->module_settings[module].log_level;
+        else //application bug. use global/unknown module 
+            module_log_level = log_module->log_level;
 
-            va_end(apc);
+        if (log_level < module_log_level)
+            continue;
+
+        const struct uc_log_args args = {
+            .dest = dest,
+            .module = log_module,
+            .log_level = log_level,
+            .file = file,
+            .line = line,
+            .raw = raw
+        }; 
+
+        //log func will mess with the va_list,
+        //so make a copy
+        va_copy(apc, ap);
+
+        switch (dest->dest_type) {
+            case UC_LDEST_SYSLOG:
+                uc_vlog_syslog(&args, fmt, apc);
+                break;
+            case UC_LDEST_STDERR:
+            case UC_LDEST_FILE:
+                uc_vlog_file(&args, fmt, apc);
+                break;
         }
+
+        va_end(apc);
     }
 
-out:
     pthread_mutex_unlock(&g_log_lock);
     va_end(ap);
 }