New upstream version 1.11.0+dfsgupstream/1.11.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 664 insertions, 29 deletions

diff --git a/libnetdata/config/Makefile.am b/libnetdata/config/Makefile.am
new file mode 100644
index 000000000..1cb69ed99
--- /dev/null
+++ b/libnetdata/config/Makefile.am
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
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+
+
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
diff --git a/libnetdata/config/Makefile.in b/libnetdata/config/Makefile.in
new file mode 100644
index 000000000..940ccb8d8
--- /dev/null
+++ b/libnetdata/config/Makefile.in
@@ -0,0 +1,464 @@
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diff --git a/libnetdata/config/README.md b/libnetdata/config/README.md
new file mode 100644
index 000000000..5e170caa9
--- /dev/null
+++ b/libnetdata/config/README.md
@@ -0,0 +1,46 @@
+# netdata ini config files
+
+Configuration files `netdata.conf` and `stream.conf` are netdata ini files.
+
+## Motivation
+
+The whole idea came up when we were evaluating the documentation involved
+in maintaining a complex configuration system. Our intention was to give
+configuration options for everything imaginable. But then, documenting all
+these options would require a tremendous amount of time, users would have
+to search through endless pages for the option they need, etc.
+
+We concluded then that **configuring software like that is a waste of time
+and effort**. Of course there must be plenty of configuration options, but
+the implementation itself should require a lot less effort for both the
+developers and the users.
+
+So, we did this:
+
+1. No configuration is required to run netdata
+2. There are plenty of options to tweak
+3. There is minimal documentation (or no at all)
+
+## Why this works?
+
+The configuration file is a `name = value` dictionary with `[sections]`.
+Write whatever you like there as long as it follows this simple format.
+
+Netdata loads this dictionary and then when the code needs a value from
+it, it just looks up the `name` in the dictionary at the proper `section`.
+In all places, in the code, there are both the `names` and their
+`default values`, so if something is not found in the configuration
+file, the default is used. The lookup is made using B-Trees and hashes
+(no string comparisons), so they are super fast. Also the `names` of the
+settings can be `my super duper setting that once set to yes, will turn the world upside down = no`
+- so goodbye to most of the documentation involved.
+
+Next, netdata can generate a valid configuration for the user to edit.
+No need to remember anything or copy and paste settings. Just get the
+configuration from the server (`/netdata.conf` on your netdata server),
+edit it and save it.
+
+Last, what about options you believe you have set, but you misspelled?
+When you get the configuration file from the server, there will be a
+comment above all `name = value` pairs the server does not use.
+So you know that whatever you wrote there, is not used.
diff --git a/src/appconfig.c b/libnetdata/config/appconfig.c
index 2424864b5..411538446 100644
--- a/src/appconfig.c
+++ b/libnetdata/config/appconfig.c
@@ -1,4 +1,6 @@
-#include "common.h"
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "../libnetdata.h"
 
 #define CONFIG_FILE_LINE_MAX ((CONFIG_MAX_NAME + CONFIG_MAX_VALUE + 1024) * 2)
 
@@ -7,11 +9,11 @@
 
 #define CONFIG_VALUE_LOADED  0x01 // has been loaded from the config
 #define CONFIG_VALUE_USED    0x02 // has been accessed from the program
-#define CONFIG_VALUE_CHANGED 0x04 // has been changed from the loaded value
+#define CONFIG_VALUE_CHANGED 0x04 // has been changed from the loaded value or the internal default value
 #define CONFIG_VALUE_CHECKED 0x08 // has been checked if the value is different from the default
 
 struct config_option {
-    avl avl;                // the index - this has to be first!
+    avl avl;                // the index entry of this entry - this has to be first!
 
     uint8_t flags;
     uint32_t hash;          // a simple hash to speed up searching
@@ -24,7 +26,7 @@ struct config_option {
 };
 
 struct section {
-    avl avl;
+    avl avl;                // the index entry of this section - this has to be first!
 
     uint32_t hash;          // a simple hash to speed up searching
                             // we first compare hashes, and only if the hashes are equal we do string comparisons
@@ -40,25 +42,6 @@ struct section {
                             // readers are protected using the rwlock in avl_tree_lock
 };
 
-static int appconfig_section_compare(void *a, void *b);
-
-struct config netdata_config = {
-        .sections = NULL,
-        .mutex = NETDATA_MUTEX_INITIALIZER,
-        .index = {
-            { NULL, appconfig_section_compare },
-            AVL_LOCK_INITIALIZER
-        }
-};
-
-struct config stream_config = {
-        .sections = NULL,
-        .mutex = NETDATA_MUTEX_INITIALIZER,
-        .index = {
-                { NULL, appconfig_section_compare },
-                AVL_LOCK_INITIALIZER
-        }
-};
 
 // ----------------------------------------------------------------------------
 // locking
@@ -104,7 +87,7 @@ static struct config_option *appconfig_option_index_find(struct section *co, con
 // ----------------------------------------------------------------------------
 // config sections index
 
-static int appconfig_section_compare(void *a, void *b) {
+int appconfig_section_compare(void *a, void *b) {
     if(((struct section *)a)->hash < ((struct section *)b)->hash) return -1;
     else if(((struct section *)a)->hash > ((struct section *)b)->hash) return 1;
     else return strcmp(((struct section *)a)->name, ((struct section *)b)->name);
@@ -445,7 +428,7 @@ int appconfig_load(struct config *root, char *filename, int overwrite_used)
 
     FILE *fp = fopen(filename, "r");
     if(!fp) {
-        error("CONFIG: cannot open file '%s'", filename);
+        // info("CONFIG: cannot open file '%s'. Using internal defaults.", filename);
         return 0;
     }
 
@@ -493,10 +476,8 @@ int appconfig_load(struct config *root, char *filename, int overwrite_used)
             error("CONFIG: ignoring line %d of file '%s', name is empty.", line, filename);
             continue;
         }
-        if(!value) {
-            debug(D_CONFIG, "CONFIG: ignoring line %d of file '%s', value is empty.", line, filename);
-            continue;
-        }
+
+        if(!value) value = "";
 
         struct config_option *cv = appconfig_option_index_find(co, name, 0);
 
diff --git a/libnetdata/config/appconfig.h b/libnetdata/config/appconfig.h
new file mode 100644
index 000000000..6ac666d8b
--- /dev/null
+++ b/libnetdata/config/appconfig.h
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+/*
+ * This section manages ini config files, like netdata.conf and stream.conf
+ *
+ * It is organized like this:
+ *
+ * struct config (i.e. netdata.conf or stream.conf)
+ *   .sections    = a linked list of struct section
+ *   .mutex       = a mutex to protect the above linked list due to multi-threading
+ *   .index       = an AVL tree of struct section
+ *
+ * struct section (i.e. [global] or [health] of netdata.conf)
+ *   .value       = a linked list of struct config_option
+ *   .mutex       = a mutex to protect the above linked list due to multi-threading
+ *   .value_index = an AVL tree of struct config_option
+ *
+ * struct config_option (ie. a name-value pair for each ini file option)
+ *
+ * The following operations on name-value options are supported:
+ *    SET           to set the value of an option
+ *    SET DEFAULT   to set the value and the default value of an option
+ *    GET           to get the value of an option
+ *    EXISTS        to check if an option exists
+ *    MOVE          to move an option from a section to another section, and/or rename it
+ *
+ *    GET and SET operations are provided for the following data types:
+ *                  STRING
+ *                  NUMBER (long long)
+ *                  FLOAT (long double)
+ *                  BOOLEAN (false, true)
+ *                  BOOLEAN ONDEMAND (false, true, auto)
+ *
+ *   GET and SET operations create struct config_option, if it is not already present.
+ *   This allows netdata to run even without netdata.conf and stream.conf. The internal
+ *   defaults are used to create the structure that should exist in the ini file and the config
+ *   file can be downloaded from the server.
+ *
+ *   Also 2 operations are supported for the whole config file:
+ *
+ *     LOAD         To load the ini file from disk
+ *     GENERATE     To generate the ini file (this is used to download the ini file from the server)
+ *
+ * For each option (name-value pair), the system maintains 4 flags:
+ *   LOADED   to indicate that the value has been loaded from the file
+ *   USED     to indicate that netdata used the value
+ *   CHANGED  to indicate that the value has been changed from the loaded value or the internal default value
+ *   CHECKED  is used internally for optimization (to avoid an strcmp() every time GET is called).
+ *
+ * TODO:
+ * 1. The linked lists and the mutexes can be removed and the AVL trees can become DICTIONARY.
+ *    This part of the code was written before we add traversal to AVL.
+ *
+ * 2. High level data types could be supported, to simplify the rest of the code:
+ *       MULTIPLE CHOICE  to let the user select one of the supported keywords
+ *                        this would allow users see in comments the available options
+ *
+ *       SIMPLE PATTERN   to let the user define netdata SIMPLE PATTERNS
+ *
+ * 3. Sorting of options should be supported.
+ *    Today, when the ini file is downloaded from the server, the options are shown in the order
+ *    they appear in the linked list (the order they were added, listing changed options first).
+ *    If we remove the linked list, the order they appear in the AVL tree will be used (which is
+ *    random due to simple_hash()).
+ *    Ideally, we support sorting of options when generating the ini file.
+ *
+ * 4. There is no free() operation. So, memory is freed on netdata exit.
+ *
+ * 5. Avoid memory fragmentation
+ *    Since entries are created from multiple threads and a lot of allocations are required
+ *    for each config_option, fragmentation can be a problem for IoT.
+ *
+ * 6. Although this way of managing options is quite flexible and dynamic, it wastes memory
+ *    for the names of the options. Since most of the option names are static, we could provide
+ *    a method to allocate only the dynamic option names.
+ */
+
+#ifndef NETDATA_CONFIG_H
+#define NETDATA_CONFIG_H 1
+
+#include "../libnetdata.h"
+
+#define CONFIG_FILENAME "netdata.conf"
+
+#define CONFIG_SECTION_GLOBAL   "global"
+#define CONFIG_SECTION_WEB      "web"
+#define CONFIG_SECTION_STATSD   "statsd"
+#define CONFIG_SECTION_PLUGINS  "plugins"
+#define CONFIG_SECTION_REGISTRY "registry"
+#define CONFIG_SECTION_HEALTH   "health"
+#define CONFIG_SECTION_BACKEND  "backend"
+#define CONFIG_SECTION_STREAM   "stream"
+
+// these are used to limit the configuration names and values lengths
+// they are not enforced by config.c functions (they will strdup() all strings, no matter of their length)
+#define CONFIG_MAX_NAME 1024
+#define CONFIG_MAX_VALUE 2048
+
+struct config {
+    struct section *sections;
+    netdata_mutex_t mutex;
+    avl_tree_lock index;
+};
+
+#define CONFIG_BOOLEAN_INVALID 100  // an invalid value to check for validity (used as default initialization when needed)
+
+#define CONFIG_BOOLEAN_NO   0       // disabled
+#define CONFIG_BOOLEAN_YES  1       // enabled
+
+#ifndef CONFIG_BOOLEAN_AUTO
+#define CONFIG_BOOLEAN_AUTO 2       // enabled if it has useful info when enabled
+#endif
+
+extern int appconfig_load(struct config *root, char *filename, int overwrite_used);
+
+extern char *appconfig_get(struct config *root, const char *section, const char *name, const char *default_value);
+extern long long appconfig_get_number(struct config *root, const char *section, const char *name, long long value);
+extern LONG_DOUBLE appconfig_get_float(struct config *root, const char *section, const char *name, LONG_DOUBLE value);
+extern int appconfig_get_boolean(struct config *root, const char *section, const char *name, int value);
+extern int appconfig_get_boolean_ondemand(struct config *root, const char *section, const char *name, int value);
+
+extern const char *appconfig_set(struct config *root, const char *section, const char *name, const char *value);
+extern const char *appconfig_set_default(struct config *root, const char *section, const char *name, const char *value);
+extern long long appconfig_set_number(struct config *root, const char *section, const char *name, long long value);
+extern LONG_DOUBLE appconfig_set_float(struct config *root, const char *section, const char *name, LONG_DOUBLE value);
+extern int appconfig_set_boolean(struct config *root, const char *section, const char *name, int value);
+
+extern int appconfig_exists(struct config *root, const char *section, const char *name);
+extern int appconfig_move(struct config *root, const char *section_old, const char *name_old, const char *section_new, const char *name_new);
+
+extern void appconfig_generate(struct config *root, BUFFER *wb, int only_changed);
+
+extern int appconfig_section_compare(void *a, void *b);
+
+#endif /* NETDATA_CONFIG_H */