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Implement File Descriptor Plugin

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Made use of /proc filesystem to get list of open file descriptors.
This is implemented as a Information_Schema plugin table PROC_FDINFO.
This commit is contained in:
Vicentiu Ciorbaru
2017-11-13 08:05:34 +02:00
parent 6c8471920a
commit d61a34662f
3 changed files with 129 additions and 1 deletions
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21
plugin/proc_info/mysql-test/proc_info/fdinfo.result Normal file
View File

@@ -0,0 +1,21 @@
SHOW CREATE TABLE INFORMATION_SCHEMA.PROC_FDINFO;
Table Create Table
PROC_FDINFO CREATE TEMPORARY TABLE `PROC_FDINFO` (
`NAME` varchar(100) NOT NULL DEFAULT '',
`VALUE` varchar(512) DEFAULT NULL
) ENGINE=MEMORY DEFAULT CHARSET=utf8
SELECT PLUGIN_NAME, PLUGIN_VERSION, PLUGIN_TYPE, PLUGIN_AUTHOR, PLUGIN_DESCRIPTION, PLUGIN_LICENSE, PLUGIN_MATURITY FROM INFORMATION_SCHEMA.PLUGINS WHERE PLUGIN_NAME='proc_fdinfo';
PLUGIN_NAME PROC_FDINFO
PLUGIN_VERSION 1.0
PLUGIN_TYPE INFORMATION SCHEMA
PLUGIN_AUTHOR
PLUGIN_DESCRIPTION Useful information from /proc
PLUGIN_LICENSE GPL
PLUGIN_MATURITY Experimental
SELECT * FROM INFORMATION_SCHEMA.PROC_FDINFO
WHERE NAME = '1' or NAME = '2' or NAME = '3'
;
NAME VALUE
1 MYSQLTEST_VARDIR_SOMETHING/log/mysqld.1.err
2 MYSQLTEST_VARDIR_SOMETHING/log/mysqld.1.err
3 MYSQLTEST_VARDIR_SOMETHING/mysqld.1/data/aria_log_control

7
plugin/proc_info/mysql-test/proc_info/fdinfo.test Normal file
View File

@@ -0,0 +1,7 @@
SHOW CREATE TABLE INFORMATION_SCHEMA.PROC_FDINFO;
query_vertical SELECT PLUGIN_NAME, PLUGIN_VERSION, PLUGIN_TYPE, PLUGIN_AUTHOR, PLUGIN_DESCRIPTION, PLUGIN_LICENSE, PLUGIN_MATURITY FROM INFORMATION_SCHEMA.PLUGINS WHERE PLUGIN_NAME='proc_fdinfo';
--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR_SOMETHING
SELECT * FROM INFORMATION_SCHEMA.PROC_FDINFO
WHERE NAME = '1' or NAME = '2' or NAME = '3'
;

102
plugin/proc_info/proc_info.cc
View File

@@ -4,6 +4,9 @@
#include <sql_class.h>
#include <mysql/plugin.h>
/* We'll use this to read directories */
#include <dirent.h>
static ST_FIELD_INFO meminfo_fields[]=
{
@@ -12,6 +15,15 @@ static ST_FIELD_INFO meminfo_fields[]=
{ 0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0 }
};
static ST_FIELD_INFO fdinfo_fields[]=
{
/* This can be number if we want to */
{ "NAME", 100, MYSQL_TYPE_STRING, 0, 0, 0, SKIP_OPEN_TABLE },
{ "VALUE", FN_REFLEN, MYSQL_TYPE_STRING, 0, MY_I_S_MAYBE_NULL, 0, SKIP_OPEN_TABLE },
{ 0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0 }
};
static int meminfo_fill(MYSQL_THD thd, TABLE_LIST *tables, COND *cond)
{
@@ -22,15 +34,18 @@ static int meminfo_fill(MYSQL_THD thd, TABLE_LIST *tables, COND *cond)
int res;
/* Here we open /proc/meminfo to get info */
if (!(fp= fopen("/proc/meminfo", "r")))
return 1;
/* Read it in a loop, storing name and value */
while ((res= fscanf(fp, "%[^:]: %lu kB\n", name, &value)) != EOF)
{
if (res != 2)
continue;
table->field[0]->store(name, strlen(name), system_charset_info);
table->field[1]->store(value);
/* table->record is filled by field[x]->store() */
if (schema_table_store_record(thd, table))
{
fclose(fp);
@@ -57,6 +72,75 @@ static int meminfo_init(void *p)
static struct st_mysql_information_schema meminfo_plugin=
{ MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION };
static struct st_mysql_information_schema fdinfo_plugin=
{ MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION };
static int fdinfo_fill(MYSQL_THD thd, TABLE_LIST *tables, COND *cond)
{
int fd;
DIR *dir; /* from dirent.h */
struct dirent dirbuf, *result;
TABLE *table= tables->table;
char final_result[FN_REFLEN + 1];
int error= 0;
if ((fd= open("/proc/self/fd", O_DIRECTORY)) < 0)
return 1;
if ((dir= fdopendir(fd)) == NULL)
{
close(fd);
return 1;
}
while (readdir_r(dir, &dirbuf, &result) == 0 && result)
{
if (result->d_name[0] == '.' /* for marko we'll do it later TODO */)
continue;
/* ASK QUESTIONS IF THIS IS NOT CLEAR!! */
ssize_t len;
len= readlinkat(fd, result->d_name, final_result, sizeof(final_result));
table->field[0]->store(result->d_name, strlen(result->d_name), system_charset_info);
if (len < 0)
{
table->field[1]->set_null();
}
else
{
table->field[1]->store(final_result, len, system_charset_info);
table->field[1]->set_notnull(); /* Sets not-null bit */
}
if (schema_table_store_record(thd, table))
{
error= 1;
break; /* Error, Crash and burn?! */
/* clang-format We should use this! */
}
}
close(fd);
closedir(dir);
return error;
}
static int fdinfo_init(void *p)
{
ST_SCHEMA_TABLE *schema= (ST_SCHEMA_TABLE *) p;
schema->fields_info= fdinfo_fields;
schema->fill_table= fdinfo_fill;
return 0;
}
maria_declare_plugin(proc_info)
{
@@ -65,7 +149,7 @@ maria_declare_plugin(proc_info)
"PROC_MEMINFO", /* name */
"" , /* author */
"Useful information from /proc", /* description */
PLUGIN_LICENSE_BSD, /* license */
PLUGIN_LICENSE_GPL, /* license */
meminfo_init, /* init callback */
0, /* deinit callback */
0x0100, /* version as hex */
@@ -73,5 +157,21 @@ maria_declare_plugin(proc_info)
NULL, /* system variables */
"1.0", /* version as a string */
MariaDB_PLUGIN_MATURITY_EXPERIMENTAL
},
{
MYSQL_INFORMATION_SCHEMA_PLUGIN, /* type */
&fdinfo_plugin, /* information schema */
"PROC_FDINFO", /* name */
"" , /* author */
"Useful information from /proc", /* description */
PLUGIN_LICENSE_GPL, /* license */
fdinfo_init, /* init callback */
0, /* deinit callback */
0x0100, /* version as hex */
NULL, /* status variables */
NULL, /* system variables */
"1.0", /* version as a string */
MariaDB_PLUGIN_MATURITY_EXPERIMENTAL
}
maria_declare_plugin_end;