| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "fcgid_spawn_ctl.h" |
| #include "fcgid_conf.h" |
| |
| #include "apr_strings.h" |
| |
| #define REGISTER_LIFE 1 |
| #define REGISTER_DEATH 2 |
| |
| struct fcgid_stat_node { |
| apr_ino_t inode; |
| dev_t deviceid; |
| uid_t uid; |
| gid_t gid; |
| const char *cmdline; |
| int vhost_id; |
| int score; |
| int process_counter; |
| int max_class_process_count; |
| int min_class_process_count; |
| apr_time_t last_stat_time; |
| struct fcgid_stat_node *next; |
| }; |
| |
| static apr_pool_t *g_stat_pool = NULL; |
| static struct fcgid_stat_node *g_stat_list_header = NULL; |
| static int g_total_process; |
| |
| static void |
| register_life_death(server_rec * main_server, |
| fcgid_procnode * procnode, int life_or_death) |
| { |
| struct fcgid_stat_node *previous_node, *current_node; |
| fcgid_server_conf *sconf = ap_get_module_config(main_server->module_config, |
| &fcgid_module); |
| apr_time_t now = apr_time_now(); |
| |
| if (!g_stat_pool || !procnode) |
| abort(); |
| |
| /* Can I find the node base on inode, device id and cmdline? */ |
| previous_node = g_stat_list_header; |
| for (current_node = previous_node; |
| current_node != NULL; current_node = current_node->next) { |
| if (current_node->inode == procnode->inode |
| && current_node->deviceid == procnode->deviceid |
| && !strcmp(current_node->cmdline, procnode->cmdline) |
| && current_node->vhost_id == procnode->vhost_id |
| && current_node->uid == procnode->uid |
| && current_node->gid == procnode->gid) |
| break; |
| previous_node = current_node; |
| } |
| |
| if (!current_node) { /* I can't find it, create one */ |
| if (life_or_death == REGISTER_DEATH) { |
| ap_log_error(APLOG_MARK, APLOG_CRIT, 0, main_server, |
| "stat node not found for exiting process %s", |
| procnode->cmdline); |
| return; |
| } |
| current_node = apr_pcalloc(g_stat_pool, sizeof(*current_node)); |
| current_node->deviceid = procnode->deviceid; |
| current_node->inode = procnode->inode; |
| current_node->cmdline = apr_pstrdup(g_stat_pool, procnode->cmdline); |
| current_node->vhost_id = procnode->vhost_id; |
| current_node->uid = procnode->uid; |
| current_node->gid = procnode->gid; |
| current_node->last_stat_time = now; |
| current_node->score = 0; |
| current_node->process_counter = 0; |
| current_node->max_class_process_count = |
| procnode->cmdopts.max_class_process_count; |
| current_node->min_class_process_count = |
| procnode->cmdopts.min_class_process_count; |
| current_node->next = NULL; |
| |
| /* append it to stat list for next search */ |
| if (!previous_node) |
| g_stat_list_header = current_node; |
| else |
| previous_node->next = current_node; |
| } |
| |
| /* Increase the score first */ |
| if (life_or_death == REGISTER_LIFE) { |
| current_node->score += sconf->spawn_score; |
| current_node->process_counter++; |
| } else { |
| current_node->score += sconf->termination_score; |
| current_node->process_counter--; |
| } |
| |
| /* Decrease the score based on elapsed time */ |
| current_node->score -= |
| sconf->time_score * |
| (int)(apr_time_sec(now) - apr_time_sec(current_node->last_stat_time)); |
| |
| /* Make score reasonable */ |
| if (current_node->score < 0) |
| current_node->score = 0; |
| |
| current_node->last_stat_time = now; |
| } |
| |
| void spawn_control_init(server_rec * main_server, apr_pool_t * configpool) |
| { |
| apr_status_t rv; |
| |
| if ((rv = apr_pool_create(&g_stat_pool, configpool)) != APR_SUCCESS) { |
| /* Fatal error */ |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, main_server, |
| "mod_fcgid: can't create stat pool"); |
| exit(1); |
| } |
| } |
| |
| void |
| register_termination(server_rec * main_server, fcgid_procnode * procnode) |
| { |
| register_life_death(main_server, procnode, REGISTER_DEATH); |
| g_total_process--; |
| } |
| |
| void register_spawn(server_rec * main_server, fcgid_procnode * procnode) |
| { |
| register_life_death(main_server, procnode, REGISTER_LIFE); |
| g_total_process++; |
| } |
| |
| /* |
| * Spawn control strategy: |
| * 1. Add FcgidSpawnScore to score if application is terminated |
| * 2. Add FcgidTerminationScore to score if application is spawned |
| * 3. Subtract FcgidTimeScore from score each second while score is positive |
| * 4. Ignore spawn request if score is higher than FcgidSpawnScoreUpLimit |
| * 5. Ignore spawn request if total process count higher than |
| * FcgidSpawnScoreUpLimit |
| * 6. Ignore spawn request if process count of this class is higher than |
| * FcgidMaxProcessesPerClass |
| */ |
| int is_spawn_allowed(server_rec * main_server, fcgid_command * command) |
| { |
| struct fcgid_stat_node *current_node; |
| fcgid_server_conf *sconf = ap_get_module_config(main_server->module_config, |
| &fcgid_module); |
| |
| if (!command || !g_stat_pool) |
| return 1; |
| |
| /* Total process count higher than up limit? */ |
| if (g_total_process >= sconf->max_process_count) { |
| ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, main_server, |
| "mod_fcgid: %s total process count %d >= %d, skip the spawn request", |
| command->cgipath, g_total_process, sconf->max_process_count); |
| return 0; |
| } |
| |
| /* Can I find the node base on inode, device id and cmdline? */ |
| for (current_node = g_stat_list_header; |
| current_node != NULL; current_node = current_node->next) { |
| if (current_node->inode == command->inode |
| && current_node->deviceid == command->deviceid |
| && !strcmp(current_node->cmdline, command->cmdline) |
| && current_node->vhost_id == command->vhost_id |
| && current_node->uid == command->uid |
| && current_node->gid == command->gid) |
| break; |
| } |
| |
| if (!current_node) { |
| /* There are no existing processes for this class, so obviously |
| * no class-specific limits have been exceeded. |
| */ |
| return 1; |
| } |
| else { |
| apr_time_t now = apr_time_now(); |
| |
| current_node->score -= |
| sconf->time_score * |
| (int)(apr_time_sec(now) - apr_time_sec(current_node->last_stat_time)); |
| current_node->last_stat_time = now; |
| if (current_node->score < 0) |
| current_node->score = 0; |
| |
| /* Score is higher than up limit? */ |
| if (current_node->score >= sconf->spawnscore_uplimit) { |
| ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, main_server, |
| "mod_fcgid: %s spawn score %d >= %d, skip the spawn request", |
| command->cgipath, current_node->score, |
| sconf->spawnscore_uplimit); |
| return 0; |
| } |
| |
| /* |
| * Process count of this class higher than up limit? |
| */ |
| if (current_node->process_counter >= current_node->max_class_process_count) { |
| ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, main_server, |
| "mod_fcgid: too many %s processes (current:%d, max:%d), skip the spawn request", |
| command->cgipath, current_node->process_counter, |
| current_node->max_class_process_count); |
| return 0; |
| } |
| |
| return 1; |
| } |
| } |
| |
| int is_kill_allowed(server_rec * main_server, fcgid_procnode * procnode) |
| { |
| struct fcgid_stat_node *current_node; |
| |
| if (!g_stat_pool || !procnode) |
| return 0; |
| |
| /* Can I find the node base on inode, device id and cmdline? */ |
| for (current_node = g_stat_list_header; |
| current_node != NULL; current_node = current_node->next) { |
| if (current_node->inode == procnode->inode |
| && current_node->deviceid == procnode->deviceid |
| && !strcmp(current_node->cmdline, procnode->cmdline) |
| && current_node->vhost_id == procnode->vhost_id |
| && current_node->uid == procnode->uid |
| && current_node->gid == procnode->gid) |
| break; |
| } |
| |
| if (current_node) { |
| /* Found the node */ |
| if (current_node->process_counter <= current_node->min_class_process_count) |
| return 0; |
| } |
| |
| return 1; |
| } |
