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MaxScale/server/core/load_utils.c
Johan Wikman 5648f708af Update license to BSL 1.1
2017-02-14 21:42:28 +02:00

895 lines
26 KiB
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/*
* Copyright (c) 2016 MariaDB Corporation Ab
*
* Use of this software is governed by the Business Source License included
* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
*
* Change Date: 2019-07-01
*
* On the date above, in accordance with the Business Source License, use
* of this software will be governed by version 2 or later of the General
* Public License.
*/
/**
* @file load_utils.c Utility functions to aid the loading of dynamic
* modules into the gateway
*
* @verbatim
* Revision History
*
* Date Who Description
* 13/06/13 Mark Riddoch Initial implementation
* 14/06/13 Mark Riddoch Updated to add call to ModuleInit if one is
* defined in the loaded module.
* Also updated to call fixed GetModuleObject
* 02/06/14 Mark Riddoch Addition of module info
* 26/02/15 Massimiliano Pinto Addition of module_feedback_send
*
* @endverbatim
*/
#include <sys/param.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <dlfcn.h>
#include <maxscale/modinfo.h>
#include <maxscale/log_manager.h>
#include <maxscale/version.h>
#include <maxscale/notification.h>
#include <curl/curl.h>
#include <sys/utsname.h>
#include <openssl/sha.h>
#include <maxscale/paths.h>
#include <maxscale/alloc.h>
#include "maxscale/modules.h"
typedef struct loaded_module
{
char *module; /**< The name of the module */
char *type; /**< The module type */
char *version; /**< Module version */
void *handle; /**< The handle returned by dlopen */
void *modobj; /**< The module "object" this is the set of entry points */
MXS_MODULE *info; /**< The module information */
struct loaded_module *next; /**< Next module in the linked list */
} LOADED_MODULE;
static LOADED_MODULE *registered = NULL;
static LOADED_MODULE *find_module(const char *module);
static LOADED_MODULE* register_module(const char *module,
const char *type,
void *dlhandle,
MXS_MODULE *mod_info);
static void unregister_module(const char *module);
int module_create_feedback_report(GWBUF **buffer, LOADED_MODULE *modules, FEEDBACK_CONF *cfg);
int do_http_post(GWBUF *buffer, void *cfg);
struct MemoryStruct
{
char *data;
size_t size;
};
/**
* Callback write routine for curl library, getting remote server reply
*
* @param contents New data to add
* @param size Data size
* @param nmemb Elements in the buffer
* @param userp Pointer to the buffer
* @return 0 on failure, memory size on success
*
*/
static size_t
WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
{
size_t realsize = size * nmemb;
struct MemoryStruct *mem = (struct MemoryStruct *)userp;
void *data = MXS_REALLOC(mem->data, mem->size + realsize + 1);
if (data == NULL)
{
return 0;
}
mem->data = data;
memcpy(&(mem->data[mem->size]), contents, realsize);
mem->size += realsize;
mem->data[mem->size] = 0;
return realsize;
}
static bool check_module(const MXS_MODULE *mod_info, const char *type, const char *module)
{
bool success = true;
if (strcmp(type, MODULE_PROTOCOL) == 0
&& mod_info->modapi != MXS_MODULE_API_PROTOCOL)
{
MXS_ERROR("Module '%s' does not implement the protocol API.", module);
success = false;
}
if (strcmp(type, MODULE_AUTHENTICATOR) == 0
&& mod_info->modapi != MXS_MODULE_API_AUTHENTICATOR)
{
MXS_ERROR("Module '%s' does not implement the authenticator API.", module);
success = false;
}
if (strcmp(type, MODULE_ROUTER) == 0
&& mod_info->modapi != MXS_MODULE_API_ROUTER)
{
MXS_ERROR("Module '%s' does not implement the router API.", module);
success = false;
}
if (strcmp(type, MODULE_MONITOR) == 0
&& mod_info->modapi != MXS_MODULE_API_MONITOR)
{
MXS_ERROR("Module '%s' does not implement the monitor API.", module);
success = false;
}
if (strcmp(type, MODULE_FILTER) == 0
&& mod_info->modapi != MXS_MODULE_API_FILTER)
{
MXS_ERROR("Module '%s' does not implement the filter API.", module);
success = false;
}
if (strcmp(type, MODULE_QUERY_CLASSIFIER) == 0
&& mod_info->modapi != MXS_MODULE_API_QUERY_CLASSIFIER)
{
MXS_ERROR("Module '%s' does not implement the query classifier API.", module);
success = false;
}
if (mod_info->version == NULL)
{
MXS_ERROR("Module '%s' does not define a version string", module);
success = false;
}
if (mod_info->module_object == NULL)
{
MXS_ERROR("Module '%s' does not define a module object", module);
success = false;
}
return success;
}
void *load_module(const char *module, const char *type)
{
ss_dassert(module && type);
LOADED_MODULE *mod;
if ((mod = find_module(module)) == NULL)
{
/** The module is not already loaded, search for the shared object */
char fname[MAXPATHLEN + 1];
snprintf(fname, MAXPATHLEN + 1, "%s/lib%s.so", get_libdir(), module);
if (access(fname, F_OK) == -1)
{
MXS_ERROR("Unable to find library for "
"module: %s. Module dir: %s",
module, get_libdir());
return NULL;
}
void *dlhandle = dlopen(fname, RTLD_NOW | RTLD_LOCAL);
if (dlhandle == NULL)
{
MXS_ERROR("Unable to load library for module: "
"%s\n\n\t\t %s."
"\n\n",
module, dlerror());
return NULL;
}
void *sym = dlsym(dlhandle, MXS_MODULE_SYMBOL_NAME);
if (sym == NULL)
{
MXS_ERROR("Expected entry point interface missing "
"from module: %s\n\t\t\t %s.",
module, dlerror());
dlclose(dlhandle);
return NULL;
}
void *(*entry_point)() = sym;
MXS_MODULE *mod_info = entry_point();
if (!check_module(mod_info, type, module) ||
(mod = register_module(module, type, dlhandle, mod_info)) == NULL)
{
dlclose(dlhandle);
return NULL;
}
MXS_NOTICE("Loaded module %s: %s from %s", module, mod_info->version, fname);
}
return mod->modobj;
}
void unload_module(const char *module)
{
LOADED_MODULE *mod = find_module(module);
if (mod)
{
void *handle = mod->handle;
unregister_module(module);
dlclose(handle);
}
}
/**
* Find a module that has been previously loaded and return the handle for that
* library
*
* @param module The name of the module
* @return The module handle or NULL if it was not found
*/
static LOADED_MODULE *
find_module(const char *module)
{
LOADED_MODULE *mod = registered;
if (module)
{
while (mod)
{
if (strcmp(mod->module, module) == 0)
{
return mod;
}
else
{
mod = mod->next;
}
}
}
return NULL;
}
/**
* Register a newly loaded module. The registration allows for single copies
* to be loaded and cached entry point information to be return.
*
* @param module The name of the module loaded
* @param type The type of the module loaded
* @param dlhandle The handle returned by dlopen
* @param version The version string returned by the module
* @param modobj The module object
* @param mod_info The module information
* @return The new registered module or NULL on memory allocation failure
*/
static LOADED_MODULE* register_module(const char *module,
const char *type,
void *dlhandle,
MXS_MODULE *mod_info)
{
module = MXS_STRDUP(module);
type = MXS_STRDUP(type);
char *version = MXS_STRDUP(mod_info->version);
LOADED_MODULE *mod = (LOADED_MODULE *)MXS_MALLOC(sizeof(LOADED_MODULE));
if (!module || !type || !version || !mod)
{
MXS_FREE((void*)module);
MXS_FREE((void*)type);
MXS_FREE(version);
MXS_FREE(mod);
return NULL;
}
mod->module = (char*)module;
mod->type = (char*)type;
mod->handle = dlhandle;
mod->version = version;
mod->modobj = mod_info->module_object;
mod->next = registered;
mod->info = mod_info;
registered = mod;
return mod;
}
/**
* Unregister a module
*
* @param module The name of the module to remove
*/
static void
unregister_module(const char *module)
{
LOADED_MODULE *mod = find_module(module);
LOADED_MODULE *ptr;
if (!mod)
{
return; // Module not found
}
if (registered == mod)
{
registered = mod->next;
}
else
{
ptr = registered;
while (ptr && ptr->next != mod)
{
ptr = ptr->next;
}
/*<
* Remove the module to be be freed from the list.
*/
if (ptr && (ptr->next == mod))
{
ptr->next = ptr->next->next;
}
}
/*<
* The module is now not in the linked list and all
* memory related to it can be freed
*/
dlclose(mod->handle);
MXS_FREE(mod->module);
MXS_FREE(mod->type);
MXS_FREE(mod->version);
MXS_FREE(mod);
}
void unload_all_modules()
{
while (registered)
{
unregister_module(registered->module);
}
}
void printModules()
{
LOADED_MODULE *ptr = registered;
printf("%-15s | %-11s | Version\n", "Module Name", "Module Type");
printf("-----------------------------------------------------\n");
while (ptr)
{
printf("%-15s | %-11s | %s\n", ptr->module, ptr->type, ptr->version);
ptr = ptr->next;
}
}
void dprintAllModules(DCB *dcb)
{
LOADED_MODULE *ptr = registered;
dcb_printf(dcb, "Modules.\n");
dcb_printf(dcb, "----------------+-----------------+---------+-------+-------------------------\n");
dcb_printf(dcb, "%-15s | %-15s | Version | API | Status\n", "Module Name", "Module Type");
dcb_printf(dcb, "----------------+-----------------+---------+-------+-------------------------\n");
while (ptr)
{
dcb_printf(dcb, "%-15s | %-15s | %-7s ", ptr->module, ptr->type, ptr->version);
if (ptr->info)
dcb_printf(dcb, "| %d.%d.%d | %s",
ptr->info->api_version.major,
ptr->info->api_version.minor,
ptr->info->api_version.patch,
ptr->info->status == MXS_MODULE_IN_DEVELOPMENT
? "In Development"
: (ptr->info->status == MXS_MODULE_ALPHA_RELEASE
? "Alpha"
: (ptr->info->status == MXS_MODULE_BETA_RELEASE
? "Beta"
: (ptr->info->status == MXS_MODULE_GA
? "GA"
: (ptr->info->status == MXS_MODULE_EXPERIMENTAL
? "Experimental" : "Unknown")))));
dcb_printf(dcb, "\n");
ptr = ptr->next;
}
dcb_printf(dcb, "----------------+-----------------+---------+-------+-------------------------\n\n");
}
void moduleShowFeedbackReport(DCB *dcb)
{
GWBUF *buffer;
LOADED_MODULE *modules_list = registered;
FEEDBACK_CONF *feedback_config = config_get_feedback_data();
if (!module_create_feedback_report(&buffer, modules_list, feedback_config))
{
MXS_ERROR("Error in module_create_feedback_report(): gwbuf_alloc() failed to allocate memory");
return;
}
dcb_printf(dcb, "%s", (char *)GWBUF_DATA(buffer));
gwbuf_free(buffer);
}
/**
* Provide a row to the result set that defines the set of modules
*
* @param set The result set
* @param data The index of the row to send
* @return The next row or NULL
*/
static RESULT_ROW *
moduleRowCallback(RESULTSET *set, void *data)
{
int *rowno = (int *)data;
int i = 0;;
char *stat, buf[20];
RESULT_ROW *row;
LOADED_MODULE *ptr;
ptr = registered;
while (i < *rowno && ptr)
{
i++;
ptr = ptr->next;
}
if (ptr == NULL)
{
MXS_FREE(data);
return NULL;
}
(*rowno)++;
row = resultset_make_row(set);
resultset_row_set(row, 0, ptr->module);
resultset_row_set(row, 1, ptr->type);
resultset_row_set(row, 2, ptr->version);
snprintf(buf, 19, "%d.%d.%d", ptr->info->api_version.major,
ptr->info->api_version.minor,
ptr->info->api_version.patch);
buf[19] = '\0';
resultset_row_set(row, 3, buf);
resultset_row_set(row, 4, ptr->info->status == MXS_MODULE_IN_DEVELOPMENT
? "In Development"
: (ptr->info->status == MXS_MODULE_ALPHA_RELEASE
? "Alpha"
: (ptr->info->status == MXS_MODULE_BETA_RELEASE
? "Beta"
: (ptr->info->status == MXS_MODULE_GA
? "GA"
: (ptr->info->status == MXS_MODULE_EXPERIMENTAL
? "Experimental" : "Unknown")))));
return row;
}
RESULTSET *moduleGetList()
{
RESULTSET *set;
int *data;
if ((data = (int *)MXS_MALLOC(sizeof(int))) == NULL)
{
return NULL;
}
*data = 0;
if ((set = resultset_create(moduleRowCallback, data)) == NULL)
{
MXS_FREE(data);
return NULL;
}
resultset_add_column(set, "Module Name", 18, COL_TYPE_VARCHAR);
resultset_add_column(set, "Module Type", 12, COL_TYPE_VARCHAR);
resultset_add_column(set, "Version", 10, COL_TYPE_VARCHAR);
resultset_add_column(set, "API Version", 8, COL_TYPE_VARCHAR);
resultset_add_column(set, "Status", 15, COL_TYPE_VARCHAR);
return set;
}
void module_feedback_send(void* data)
{
LOADED_MODULE *modules_list = registered;
CURL *curl = NULL;
CURLcode res;
struct curl_httppost *formpost = NULL;
struct curl_httppost *lastptr = NULL;
GWBUF *buffer = NULL;
void *data_ptr = NULL;
long http_code = 0;
int last_action = _NOTIFICATION_SEND_PENDING;
time_t now;
struct tm *now_tm;
int hour;
int n_mod = 0;
char hex_setup_info[2 * SHA_DIGEST_LENGTH + 1] = "";
int http_send = 0;
now = time(NULL);
struct tm now_result;
now_tm = localtime_r(&now, &now_result);
hour = now_tm->tm_hour;
FEEDBACK_CONF *feedback_config = (FEEDBACK_CONF *) data;
/* Configuration check */
if (feedback_config->feedback_enable == 0 ||
feedback_config->feedback_url == NULL ||
feedback_config->feedback_user_info == NULL)
{
MXS_ERROR("Error in module_feedback_send(): some mandatory parameters are not set"
" feedback_enable=%u, feedback_url=%s, feedback_user_info=%s",
feedback_config->feedback_enable,
feedback_config->feedback_url == NULL ? "NULL" : feedback_config->feedback_url,
feedback_config->feedback_user_info == NULL ?
"NULL" : feedback_config->feedback_user_info);
feedback_config->feedback_last_action = _NOTIFICATION_SEND_ERROR;
return;
}
/**
* Task runs nightly, from 2 AM to 4 AM
*
* If it's done in that time interval, it will be skipped
*/
if (hour > 4 || hour < 2)
{
/* It's not the rigt time, mark it as to be done and return */
feedback_config->feedback_last_action = _NOTIFICATION_SEND_PENDING;
MXS_INFO("module_feedback_send(): execution skipped, current hour [%d]"
" is not within the proper interval (from 2 AM to 4 AM)",
hour);
return;
}
/* Time to run the task: if a previous run was succesfull skip next runs */
if (feedback_config->feedback_last_action == _NOTIFICATION_SEND_OK)
{
/* task was done before, return */
MXS_INFO("module_feedback_send(): execution skipped because of previous "
"succesful run: hour is [%d], last_action [%d]",
hour, feedback_config->feedback_last_action);
return;
}
MXS_INFO("module_feedback_send(): task now runs: hour is [%d], last_action [%d]",
hour, feedback_config->feedback_last_action);
if (!module_create_feedback_report(&buffer, modules_list, feedback_config))
{
MXS_ERROR("Error in module_create_feedback_report(): gwbuf_alloc() failed to allocate memory");
feedback_config->feedback_last_action = _NOTIFICATION_SEND_ERROR;
return;
}
/* try sending data via http/https post */
http_send = do_http_post(buffer, feedback_config);
if (http_send == 0)
{
feedback_config->feedback_last_action = _NOTIFICATION_SEND_OK;
}
else
{
feedback_config->feedback_last_action = _NOTIFICATION_SEND_ERROR;
MXS_INFO("Error in module_create_feedback_report(): do_http_post ret_code is %d", http_send);
}
MXS_INFO("module_feedback_send(): task completed: hour is [%d], last_action [%d]",
hour,
feedback_config->feedback_last_action);
gwbuf_free(buffer);
}
/**
* Create the feedback report as string.
* I t could be sent to notification service
* or just printed via maxadmin/telnet
*
* @param buffe The pointr for GWBUF allocation, to be freed by the caller
* @param modules The mouleds list
* @param cfg The feedback configuration
* @return 0 on failure, 1 on success
*
*/
int
module_create_feedback_report(GWBUF **buffer, LOADED_MODULE *modules, FEEDBACK_CONF *cfg)
{
LOADED_MODULE *ptr = modules;
int n_mod = 0;
char *data_ptr = NULL;
char hex_setup_info[2 * SHA_DIGEST_LENGTH + 1] = "";
time_t now;
struct tm *now_tm;
int report_max_bytes = 0;
if (buffer == NULL)
{
return 0;
}
now = time(NULL);
/* count loaded modules */
while (ptr)
{
ptr = ptr->next;
n_mod++;
}
/* module lists pointer is set back to the head */
ptr = modules;
/**
* allocate gwbuf for data to send
*
* each module gives 4 rows
* product and release rows add 7 rows
* row is _NOTIFICATION_REPORT_ROW_LEN bytes long
*/
report_max_bytes = ((n_mod * 4) + 7) * (_NOTIFICATION_REPORT_ROW_LEN + 1);
*buffer = gwbuf_alloc(report_max_bytes);
if (*buffer == NULL)
{
return 0;
}
/* encode MAC-sha1 to HEX */
gw_bin2hex(hex_setup_info, cfg->mac_sha1, SHA_DIGEST_LENGTH);
data_ptr = (char *)GWBUF_DATA(*buffer);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "FEEDBACK_SERVER_UID\t%s\n", hex_setup_info);
data_ptr += strlen(data_ptr);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "FEEDBACK_USER_INFO\t%s\n",
cfg->feedback_user_info == NULL ? "not_set" : cfg->feedback_user_info);
data_ptr += strlen(data_ptr);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "VERSION\t%s\n", MAXSCALE_VERSION);
data_ptr += strlen(data_ptr);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN * 2, "NOW\t%lu\nPRODUCT\t%s\n", now, "maxscale");
data_ptr += strlen(data_ptr);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "Uname_sysname\t%s\n", cfg->sysname);
data_ptr += strlen(data_ptr);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "Uname_distribution\t%s\n", cfg->release_info);
data_ptr += strlen(data_ptr);
while (ptr)
{
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN * 2,
"module_%s_type\t%s\nmodule_%s_version\t%s\n",
ptr->module, ptr->type, ptr->module, ptr->version);
data_ptr += strlen(data_ptr);
if (ptr->info)
{
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "module_%s_api\t%d.%d.%d\n",
ptr->module,
ptr->info->api_version.major,
ptr->info->api_version.minor,
ptr->info->api_version.patch);
data_ptr += strlen(data_ptr);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "module_%s_releasestatus\t%s\n",
ptr->module,
ptr->info->status == MXS_MODULE_IN_DEVELOPMENT
? "In Development"
: (ptr->info->status == MXS_MODULE_ALPHA_RELEASE
? "Alpha"
: (ptr->info->status == MXS_MODULE_BETA_RELEASE
? "Beta"
: (ptr->info->status == MXS_MODULE_GA
? "GA"
: (ptr->info->status == MXS_MODULE_EXPERIMENTAL
? "Experimental" : "Unknown")))));
data_ptr += strlen(data_ptr);
}
ptr = ptr->next;
}
return 1;
}
/**
* Send data to notification service via http/https
*
* @param buffer The GWBUF with data to send
* @param cfg The configuration details of notification service
* @return 0 on success, != 0 on failure
*/
int
do_http_post(GWBUF *buffer, void *cfg)
{
CURL *curl = NULL;
CURLcode res;
struct curl_httppost *formpost = NULL;
struct curl_httppost *lastptr = NULL;
long http_code = 0;
struct MemoryStruct chunk;
int ret_code = 1;
FEEDBACK_CONF *feedback_config = (FEEDBACK_CONF *) cfg;
/* allocate first memory chunck for httpd servr reply */
chunk.data = MXS_MALLOC(1); /* will be grown as needed by the realloc above */
MXS_ABORT_IF_NULL(chunk.data);
chunk.size = 0; /* no data at this point */
/* Initializing curl library for data send via HTTP */
curl_global_init(CURL_GLOBAL_DEFAULT);
curl = curl_easy_init();
if (curl)
{
char error_message[CURL_ERROR_SIZE] = "";
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, error_message);
curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, feedback_config->feedback_connect_timeout);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, feedback_config->feedback_timeout);
/* curl API call for data send via HTTP POST using a "file" type input */
curl_formadd(&formpost,
&lastptr,
CURLFORM_COPYNAME, "data",
CURLFORM_BUFFER, "report.txt",
CURLFORM_BUFFERPTR, (char *)GWBUF_DATA(buffer),
CURLFORM_BUFFERLENGTH, strlen((char *)GWBUF_DATA(buffer)),
CURLFORM_CONTENTTYPE, "text/plain",
CURLFORM_END);
curl_easy_setopt(curl, CURLOPT_HEADER, 1);
/* some servers don't like requests that are made without a user-agent field, so we provide one */
curl_easy_setopt(curl, CURLOPT_USERAGENT, "MaxScale-agent/http-1.0");
/* Force HTTP/1.0 */
curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
curl_easy_setopt(curl, CURLOPT_URL, feedback_config->feedback_url);
curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
/* send all data to this function */
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
/* we pass our 'chunk' struct to the callback function */
curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
/* Perform the request, res will get the return code */
res = curl_easy_perform(curl);
/* Check for errors */
if (res != CURLE_OK)
{
ret_code = 2;
MXS_ERROR("do_http_post(), curl call for [%s] failed due: %s, %s",
feedback_config->feedback_url,
curl_easy_strerror(res),
error_message);
goto cleanup;
}
else
{
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code);
}
if (http_code == 302)
{
char *from = strstr(chunk.data, "<h1>ok</h1>");
if (from)
{
ret_code = 0;
}
else
{
ret_code = 3;
goto cleanup;
}
}
else
{
MXS_ERROR("do_http_post(), Bad HTTP Code from remote server: %lu", http_code);
ret_code = 4;
goto cleanup;
}
}
else
{
MXS_ERROR("do_http_post(), curl object not initialized");
ret_code = 1;
goto cleanup;
}
MXS_INFO("do_http_post() ret_code [%d], HTTP code [%ld]",
ret_code, http_code);
cleanup:
if (chunk.data)
{
MXS_FREE(chunk.data);
}
if (curl)
{
curl_easy_cleanup(curl);
curl_formfree(formpost);
}
curl_global_cleanup();
return ret_code;
}
const MXS_MODULE *get_module(const char *name, const char *type)
{
LOADED_MODULE *mod = find_module(name);
if (mod == NULL && load_module(name, type))
{
mod = find_module(name);
}
return mod ? mod->info : NULL;
}
MXS_MODULE_ITERATOR mxs_module_iterator_get(const char* type)
{
LOADED_MODULE* module = registered;
while (module && type && (strcmp(module->type, type) != 0))
{
module = module->next;
}
MXS_MODULE_ITERATOR iterator;
iterator.type = type;
iterator.position = module;
return iterator;
}
bool mxs_module_iterator_has_next(const MXS_MODULE_ITERATOR* iterator)
{
return iterator->position != NULL;
}
MXS_MODULE* mxs_module_iterator_get_next(MXS_MODULE_ITERATOR* iterator)
{
MXS_MODULE* module = NULL;
LOADED_MODULE* loaded_module = (LOADED_MODULE*)iterator->position;
if (loaded_module)
{
module = loaded_module->info;
do
{
loaded_module = loaded_module->next;
}
while (loaded_module && iterator->type && (strcmp(loaded_module->type, iterator->type) != 0));
iterator->position = loaded_module;
}
return module;
}
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