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<Location /manager> SetHandler balancer-manager </Location> It enables changing load factors, session routes, redirection routes, and disabling/enabling particular workers. git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@104812 13f79535-47bb-0310-9956-ffa450edef68
683 lines
26 KiB
C
683 lines
26 KiB
C
/* Copyright 1999-2004 The Apache Software Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* Load balancer module for Apache proxy */
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#define CORE_PRIVATE
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#include "mod_proxy.h"
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#include "ap_mpm.h"
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#include "apr_version.h"
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module AP_MODULE_DECLARE_DATA proxy_balancer_module;
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#if APR_HAS_THREADS
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#define PROXY_BALANCER_LOCK(b) apr_thread_mutex_lock((b)->mutex)
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#define PROXY_BALANCER_UNLOCK(b) apr_thread_mutex_unlock((b)->mutex)
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#else
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#define PROXY_BALANCER_LOCK(b) APR_SUCCESS
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#define PROXY_BALANCER_UNLOCK(b) APR_SUCCESS
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#endif
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/* Retrieve the parameter with the given name */
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static char *get_path_param(apr_pool_t *pool, char *url,
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const char *name)
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{
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char *path = NULL;
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for (path = strstr(url, name); path; path = strstr(path + 1, name)) {
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path += (strlen(name) + 1);
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if (*path == '=') {
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/*
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* Session path was found, get it's value
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*/
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++path;
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if (strlen(path)) {
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char *q;
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path = apr_pstrdup(pool, path);
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if ((q = strchr(path, '?')))
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*q = '\0';
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return path;
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}
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}
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}
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return NULL;
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}
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static char *get_cookie_param(request_rec *r, const char *name)
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{
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const char *cookies;
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const char *start_cookie;
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if ((cookies = apr_table_get(r->headers_in, "Cookie"))) {
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for (start_cookie = ap_strstr_c(cookies, name); start_cookie;
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start_cookie = ap_strstr_c(start_cookie + 1, name)) {
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if (start_cookie == cookies ||
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start_cookie[-1] == ';' ||
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start_cookie[-1] == ',' ||
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isspace(start_cookie[-1])) {
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start_cookie += strlen(name);
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while(*start_cookie && isspace(*start_cookie))
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++start_cookie;
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if (*start_cookie == '=' && start_cookie[1]) {
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/*
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* Session cookie was found, get it's value
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*/
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char *end_cookie, *cookie;
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++start_cookie;
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cookie = apr_pstrdup(r->pool, start_cookie);
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if ((end_cookie = strchr(cookie, ';')) != NULL)
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*end_cookie = '\0';
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if((end_cookie = strchr(cookie, ',')) != NULL)
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*end_cookie = '\0';
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return cookie;
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}
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}
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}
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}
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return NULL;
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}
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static proxy_runtime_worker *find_route_worker(proxy_balancer *balancer,
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const char *route)
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{
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int i;
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proxy_runtime_worker *worker = (proxy_runtime_worker *)balancer->workers->elts;
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for (i = 0; i < balancer->workers->nelts; i++) {
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if (worker->w->route && strcmp(worker->w->route, route) == 0) {
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return worker;
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}
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worker++;
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}
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return NULL;
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}
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static proxy_runtime_worker *find_session_route(proxy_balancer *balancer,
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request_rec *r,
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char **route,
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char **url)
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{
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if (!balancer->sticky)
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return NULL;
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/* Try to find the sticky route inside url */
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*route = get_path_param(r->pool, *url, balancer->sticky);
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if (!*route)
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*route = get_cookie_param(r, balancer->sticky);
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if (*route) {
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proxy_runtime_worker *worker = find_route_worker(balancer, *route);
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/* TODO: make worker status codes */
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/* See if we have a redirection route */
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if (worker && !PROXY_WORKER_IS_USABLE(worker->w)) {
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if (worker->w->redirect)
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worker = find_route_worker(balancer, worker->w->redirect);
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/* Check if the redirect worker is usable */
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if (worker && !PROXY_WORKER_IS_USABLE(worker->w))
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worker = NULL;
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}
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else
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worker = NULL;
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return worker;
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}
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else
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return NULL;
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}
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static proxy_runtime_worker *find_best_worker(proxy_balancer *balancer,
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request_rec *r)
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{
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int i;
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double total_factor = 0.0;
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proxy_runtime_worker *worker = (proxy_runtime_worker *)balancer->workers->elts;
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proxy_runtime_worker *candidate = NULL;
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/* First try to see if we have available candidate */
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for (i = 0; i < balancer->workers->nelts; i++) {
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/* See if the retry timeout is ellapsed
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* for the workers flagged as IN_ERROR
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*/
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if (!PROXY_WORKER_IS_USABLE(worker->w))
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ap_proxy_retry_worker("BALANCER", worker->w, r->server);
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/* If the worker is not in error state
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* or not disabled.
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*/
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if (PROXY_WORKER_IS_USABLE(worker->w)) {
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if (!candidate)
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candidate = worker;
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else {
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/* See if the worker has a larger number of free channels */
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if (worker->w->cp->nfree > candidate->w->cp->nfree)
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candidate = worker;
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}
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/* Total factor should allways be 100.
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* This is for cases when worker is in error state.
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* It will force the even request distribution
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*/
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total_factor += worker->s->lbfactor;
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}
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worker++;
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}
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if (!candidate) {
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/* All the workers are in error state or disabled.
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* If the balancer has a timeout wait.
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*/
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#if APR_HAS_THREADS
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if (balancer->timeout) {
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/* XXX: This can perhaps be build using some
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* smarter mechanism, like tread_cond.
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* But since the statuses can came from
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* different childs, use the provided algo.
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*/
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apr_interval_time_t timeout = balancer->timeout;
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apr_interval_time_t step, tval = 0;
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balancer->timeout = 0;
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step = timeout / 100;
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while (tval < timeout) {
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apr_sleep(step);
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/* Try again */
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if ((candidate = find_best_worker(balancer, r)))
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break;
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tval += step;
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}
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/* restore the timeout */
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balancer->timeout = timeout;
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}
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#endif
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}
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else {
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/* We have at least one candidate that is not in
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* error state or disabled.
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* Now calculate the appropriate one
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*/
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worker = (proxy_runtime_worker *)balancer->workers->elts;
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for (i = 0; i < balancer->workers->nelts; i++) {
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/* If the worker is not error state
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* or not in disabled mode
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*/
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if (PROXY_WORKER_IS_USABLE(worker->w)) {
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/* 1. Find the worker with higher lbstatus.
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* Lbstatus is of higher importance then
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* the number of empty slots.
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*/
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if (worker->s->lbstatus > candidate->s->lbstatus) {
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candidate = worker;
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}
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}
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worker++;
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}
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worker = (proxy_runtime_worker *)balancer->workers->elts;
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for (i = 0; i < balancer->workers->nelts; i++) {
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/* If the worker is not error state
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* or not in disabled mode
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*/
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if (PROXY_WORKER_IS_USABLE(worker->w)) {
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/* XXX: The lbfactor can be update using bytes transfered
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* Right now, use the round-robin scheme
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*/
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worker->s->lbstatus += worker->s->lbfactor;
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if (worker->s->lbstatus >= total_factor)
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worker->s->lbstatus = worker->s->lbfactor;
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}
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worker++;
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}
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}
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return candidate;
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}
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static int rewrite_url(request_rec *r, proxy_worker *worker,
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char **url)
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{
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const char *scheme = strstr(*url, "://");
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const char *path = NULL;
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if (scheme)
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path = ap_strchr_c(scheme + 3, '/');
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/* we break the URL into host, port, uri */
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if (!worker) {
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return ap_proxyerror(r, HTTP_BAD_REQUEST, apr_pstrcat(r->pool,
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"missing worker. URI cannot be parsed: ", *url,
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NULL));
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}
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*url = apr_pstrcat(r->pool, worker->name, path, NULL);
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return OK;
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}
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static int proxy_balancer_pre_request(proxy_worker **worker,
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proxy_balancer **balancer,
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request_rec *r,
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proxy_server_conf *conf, char **url)
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{
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int access_status;
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proxy_runtime_worker *runtime;
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char *route;
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apr_status_t rv;
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*worker = NULL;
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/* Spet 1: check if the url is for us */
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if (!(*balancer = ap_proxy_get_balancer(r->pool, conf, *url)))
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return DECLINED;
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/* Step 2: find the session route */
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runtime = find_session_route(*balancer, r, &route, url);
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if (!runtime) {
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if (route && (*balancer)->sticky_force) {
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ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
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"proxy: BALANCER: (%s). All workers are in error state for route (%s)",
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(*balancer)->name, route);
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return HTTP_SERVICE_UNAVAILABLE;
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}
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}
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else {
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int i;
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proxy_runtime_worker *workers;
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/* We have a sticky load balancer */
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runtime->s->elected++;
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*worker = runtime->w;
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/* Update the workers status
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* so that even session routes get
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* into account.
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*/
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workers = (proxy_runtime_worker *)(*balancer)->workers->elts;
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for (i = 0; i < (*balancer)->workers->nelts; i++) {
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/* For now assume that all workers are OK */
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workers->s->lbstatus += workers->s->lbfactor;
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if (workers->s->lbstatus >= 100.0)
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workers->s->lbstatus = workers->s->lbfactor;
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workers++;
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}
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}
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/* Lock the LoadBalancer
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* XXX: perhaps we need the process lock here
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*/
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if ((rv = PROXY_BALANCER_LOCK(*balancer)) != APR_SUCCESS) {
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ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
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"proxy: BALANCER: lock");
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return DECLINED;
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}
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if (!*worker) {
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runtime = find_best_worker(*balancer, r);
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if (!runtime) {
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ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
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"proxy: BALANCER: (%s). All workers are in error state",
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(*balancer)->name);
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PROXY_BALANCER_UNLOCK(*balancer);
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return HTTP_SERVICE_UNAVAILABLE;
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}
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runtime->s->elected++;
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*worker = runtime->w;
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}
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/* Decrease the free channels number */
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if ((*worker)->cp->nfree)
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--(*worker)->cp->nfree;
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PROXY_BALANCER_UNLOCK(*balancer);
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access_status = rewrite_url(r, *worker, url);
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/* Add the session route to request notes if present */
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if (route) {
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apr_table_setn(r->notes, "session-sticky", (*balancer)->sticky);
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apr_table_setn(r->notes, "session-route", route);
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}
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy_balancer_pre_request rewriting to %s", *url);
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy_balancer_pre_request worker (%s) free %d",
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(*worker)->name,
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(*worker)->cp->nfree);
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return access_status;
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}
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static int proxy_balancer_post_request(proxy_worker *worker,
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proxy_balancer *balancer,
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request_rec *r,
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proxy_server_conf *conf)
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{
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apr_status_t rv;
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if ((rv = PROXY_BALANCER_LOCK(balancer)) != APR_SUCCESS) {
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ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
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"proxy: BALANCER: lock");
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return HTTP_INTERNAL_SERVER_ERROR;
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}
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/* increase the free channels number */
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if (worker->cp->nfree)
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worker->cp->nfree++;
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/* TODO: calculate the bytes transfered */
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/* TODO: update the scoreboard status */
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PROXY_BALANCER_UNLOCK(balancer);
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy_balancer_post_request for (%s)", balancer->name);
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return OK;
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}
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static void recalc_factors(proxy_balancer *balancer,
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proxy_runtime_worker *fixed)
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{
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int i;
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double median, ffactor = 0.0;
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proxy_runtime_worker *workers;
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/* Recalculate lbfactors */
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workers = (proxy_runtime_worker *)balancer->workers->elts;
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/* Special case if there is only one worker it's
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* load factor will always be 100
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*/
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if (balancer->workers->nelts == 1) {
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workers->s->lbstatus = workers->s->lbfactor = 100.0;
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return;
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}
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for (i = 0; i < balancer->workers->nelts; i++) {
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if (workers[i].s->lbfactor > 100.0)
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workers[i].s->lbfactor = 100.0;
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ffactor += workers[i].s->lbfactor;
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}
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if (ffactor < 100.0) {
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median = (100.0 - ffactor) / (balancer->workers->nelts - 1);
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for (i = 0; i < balancer->workers->nelts; i++) {
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if (&(workers[i]) != fixed)
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workers[i].s->lbfactor += median;
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}
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}
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else if (fixed->s->lbfactor < 100.0) {
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median = (ffactor - 100.0) / (balancer->workers->nelts - 1);
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for (i = 0; i < balancer->workers->nelts; i++) {
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if (workers[i].s->lbfactor > median &&
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&(workers[i]) != fixed)
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workers[i].s->lbfactor -= median;
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}
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}
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else {
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median = (ffactor - 100.0) / balancer->workers->nelts;
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for (i = 0; i < balancer->workers->nelts; i++) {
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workers[i].s->lbfactor -= median;
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}
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}
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for (i = 0; i < balancer->workers->nelts; i++) {
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/* Update the status entires */
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workers[i].s->lbstatus = workers[i].s->lbfactor;
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}
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}
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/* Invoke handler */
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static int balancer_handler(request_rec *r)
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{
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void *sconf = r->server->module_config;
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proxy_server_conf *conf = (proxy_server_conf *)
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ap_get_module_config(sconf, &proxy_module);
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apr_array_header_t *proxies = conf->proxies;
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struct proxy_remote *ents = (struct proxy_remote *)proxies->elts;
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proxy_balancer *balancer, *bsel = NULL;
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proxy_runtime_worker *worker, *wsel = NULL;
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apr_table_t *params = apr_table_make(r->pool, 10);
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int access_status;
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int i, n;
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const char *name;
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/* is this for us? */
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if (strcmp(r->handler, "balancer-manager"))
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return DECLINED;
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r->allowed = (AP_METHOD_BIT << M_GET);
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if (r->method_number != M_GET)
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return DECLINED;
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if (r->args) {
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char *args = apr_pstrdup(r->pool, r->args);
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char *tok, *val;
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while (args && *args) {
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if ((val = ap_strchr_c(args, '='))) {
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*val++ = '\0';
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if ((tok = ap_strchr_c(val, '&')))
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*tok++ = '\0';
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if ((access_status = ap_unescape_url(val)) != OK)
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return access_status;
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apr_table_setn(params, args, val);
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args = tok;
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}
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else
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return HTTP_BAD_REQUEST;
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}
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}
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if ((name = apr_table_get(params, "b")))
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bsel = ap_proxy_get_balancer(r->pool, conf,
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apr_pstrcat(r->pool, "balancer://", name, NULL));
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if ((name = apr_table_get(params, "w"))) {
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const char *sc = apr_table_get(params, "s");
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char *asname = NULL;
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proxy_worker *ws = NULL;
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if (sc) {
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asname = apr_pstrcat(r->pool, sc, "://", name, NULL);
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ws = ap_proxy_get_worker(r->pool, conf, asname);
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}
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if (ws) {
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worker = (proxy_runtime_worker *)bsel->workers->elts;
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for (n = 0; n < bsel->workers->nelts; n++) {
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if (strcasecmp(worker->w->name, ws->name) == 0) {
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wsel = worker;
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break;
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}
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++worker;
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}
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}
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}
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/* First set the params */
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if (bsel) {
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const char *val;
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if ((val = apr_table_get(params, "ss"))) {
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if (strlen(val))
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bsel->sticky = apr_pstrdup(conf->pool, val);
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else
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bsel->sticky = NULL;
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}
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if ((val = apr_table_get(params, "tm"))) {
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int ival = atoi(val);
|
|
if (ival >= 0)
|
|
bsel->timeout = apr_time_from_sec(ival);
|
|
}
|
|
}
|
|
if (wsel) {
|
|
const char *val;
|
|
if ((val = apr_table_get(params, "lf"))) {
|
|
char *ep;
|
|
double dval = strtod(val, &ep);
|
|
if (dval > 1) {
|
|
wsel->s->lbfactor = dval;
|
|
if (bsel)
|
|
recalc_factors(bsel, wsel);
|
|
}
|
|
}
|
|
if ((val = apr_table_get(params, "wr"))) {
|
|
if (strlen(val))
|
|
wsel->w->route = apr_pstrdup(conf->pool, val);
|
|
else
|
|
wsel->w->route = NULL;
|
|
}
|
|
if ((val = apr_table_get(params, "rr"))) {
|
|
if (strlen(val))
|
|
wsel->w->redirect = apr_pstrdup(conf->pool, val);
|
|
else
|
|
wsel->w->redirect = NULL;
|
|
}
|
|
if ((val = apr_table_get(params, "dw")))
|
|
wsel->w->status |= PROXY_WORKER_DISABLED;
|
|
else
|
|
wsel->w->status &= ~PROXY_WORKER_DISABLED;
|
|
|
|
}
|
|
if (apr_table_get(params, "xml")) {
|
|
ap_set_content_type(r, "text/xml");
|
|
ap_rputs("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n", r);
|
|
ap_rputs("<httpd:manager xmlns:httpd=\"http://httpd.apache.org\">\n", r);
|
|
ap_rputs(" <httpd:balancers>\n", r);
|
|
balancer = (proxy_balancer *)conf->balancers->elts;
|
|
for (i = 0; i < conf->balancers->nelts; i++) {
|
|
ap_rputs(" <httpd:balancer>\n", r);
|
|
ap_rvputs(r, " <httpd:name>", balancer->name, "</httpd:name>\n", NULL);
|
|
ap_rputs(" <httpd:workers>\n", r);
|
|
worker = (proxy_runtime_worker *)balancer->workers->elts;
|
|
for (n = 0; n < balancer->workers->nelts; n++) {
|
|
ap_rputs(" <httpd:worker>\n", r);
|
|
ap_rvputs(r, " <httpd:scheme>", worker->w->scheme,
|
|
"</httpd:scheme>\n", NULL);
|
|
ap_rvputs(r, " <httpd:hostname>", worker->w->hostname,
|
|
"</httpd:hostname>\n", NULL);
|
|
ap_rprintf(r, " <httpd:loadfactor>%.2f</httpd:loadfactor>\n",
|
|
worker->s->lbfactor);
|
|
ap_rputs(" </httpd:worker>\n", r);
|
|
++worker;
|
|
}
|
|
ap_rputs(" </httpd:workers>\n", r);
|
|
ap_rputs(" </httpd:balancer>\n", r);
|
|
++balancer;
|
|
}
|
|
ap_rputs(" </httpd:balancers>\n", r);
|
|
ap_rputs("</httpd:manager>", r);
|
|
}
|
|
else {
|
|
ap_set_content_type(r, "text/html");
|
|
ap_rputs(DOCTYPE_HTML_3_2
|
|
"<html><head><title>Balancer Manager</title></head>\n", r);
|
|
ap_rputs("<body><h1>Load Balancer Manager for ", r);
|
|
ap_rvputs(r, ap_get_server_name(r), "</h1>\n\n", NULL);
|
|
ap_rvputs(r, "<dl><dt>Server Version: ",
|
|
ap_get_server_version(), "</dt>\n", NULL);
|
|
ap_rvputs(r, "<dt>Server Built: ",
|
|
ap_get_server_built(), "\n</dt></dl>\n", NULL);
|
|
balancer = (proxy_balancer *)conf->balancers->elts;
|
|
for (i = 0; i < conf->balancers->nelts; i++) {
|
|
ap_rputs("<hr />\n<h3>LoadBalancer Status for ", r);
|
|
ap_rvputs(r, "<a href=\"", r->uri, "?b=",
|
|
balancer->name + sizeof("balancer://") - 1,
|
|
"\">", NULL);
|
|
ap_rvputs(r, balancer->name, "</a></h3>\n\n", NULL);
|
|
ap_rputs("\n\n<table border=\"0\"><tr>"
|
|
"<th>StickySesion</th><th>Timeout</th>"
|
|
"</tr>\n<tr>", r);
|
|
ap_rvputs(r, "<td>", balancer->sticky, NULL);
|
|
ap_rprintf(r, "</td><td>%" APR_TIME_T_FMT "</td>\n",
|
|
apr_time_sec(balancer->timeout));
|
|
ap_rputs("</table>\n", r);
|
|
ap_rputs("\n\n<table border=\"0\"><tr>"
|
|
"<th>Scheme</th><th>Host</th>"
|
|
"<th>Route</th><th>RouteRedir</th>"
|
|
"<th>Factor</th><th>Status</th>"
|
|
"</tr>\n", r);
|
|
|
|
worker = (proxy_runtime_worker *)balancer->workers->elts;
|
|
for (n = 0; n < balancer->workers->nelts; n++) {
|
|
|
|
ap_rvputs(r, "<tr>\n<td>", worker->w->scheme, "</td><td>", NULL);
|
|
ap_rvputs(r, "<a href=\"", r->uri, "?b=",
|
|
balancer->name + sizeof("balancer://") - 1,
|
|
"&s=", worker->w->scheme, "&w=", worker->w->hostname,
|
|
"\">", NULL);
|
|
ap_rvputs(r, worker->w->hostname, "</a></td>", NULL);
|
|
ap_rvputs(r, "<td>", worker->w->route, NULL);
|
|
ap_rvputs(r, "</td><td>", worker->w->redirect, NULL);
|
|
ap_rprintf(r, "</td><td>%.2f</td><td>", worker->s->lbfactor);
|
|
if (worker->w->status & PROXY_WORKER_DISABLED)
|
|
ap_rputs("Dis", r);
|
|
else if (worker->w->status & PROXY_WORKER_IN_ERROR)
|
|
ap_rputs("Err", r);
|
|
else if (worker->w->status & PROXY_WORKER_INITIALIZED)
|
|
ap_rputs("Ok", r);
|
|
else
|
|
ap_rputs("-", r);
|
|
ap_rputs("</td></tr>\n", r);
|
|
|
|
++worker;
|
|
}
|
|
ap_rputs("</table>\n", r);
|
|
++balancer;
|
|
}
|
|
ap_rputs("<hr />\n", r);
|
|
if (wsel && bsel) {
|
|
ap_rputs("<h3>Edit worker settings for ", r);
|
|
ap_rvputs(r, wsel->w->name, "</h3>\n", NULL);
|
|
ap_rvputs(r, "<form method=\"GET\" action=\"", NULL);
|
|
ap_rvputs(r, r->uri, "\">\n<dl>", NULL);
|
|
ap_rputs("<table><tr><td>Load factor:</td><td><input name=\"lf\" type=text ", r);
|
|
ap_rprintf(r, "value=\"%.2f\"></td><tr>\n", wsel->s->lbfactor);
|
|
ap_rputs("<tr><td>Route:</td><td><input name=\"wr\" type=text ", r);
|
|
ap_rvputs(r, "value=\"", wsel->w->route, NULL);
|
|
ap_rputs("\"></td><tr>\n", r);
|
|
ap_rputs("<tr><td>Route Redirect:</td><td><input name=\"rr\" type=text ", r);
|
|
ap_rvputs(r, "value=\"", wsel->w->redirect, NULL);
|
|
ap_rputs("\"></td><tr>\n", r);
|
|
ap_rputs("<tr><td>Disabled:</td><td><input name=\"dw\" type=checkbox", r);
|
|
if (wsel->w->status & PROXY_WORKER_DISABLED)
|
|
ap_rputs(" checked", r);
|
|
ap_rputs("></td><tr>\n", r);
|
|
ap_rputs("<tr><td colspan=2><input type=submit value=\"Submit\"></td></tr>\n", r);
|
|
ap_rvputs(r, "</table>\n<input type=hidden name=\"s\" ", NULL);
|
|
ap_rvputs(r, "value=\"", wsel->w->scheme, "\">\n", NULL);
|
|
ap_rvputs(r, "<input type=hidden name=\"w\" ", NULL);
|
|
ap_rvputs(r, "value=\"", wsel->w->hostname, "\">\n", NULL);
|
|
ap_rvputs(r, "<input type=hidden name=\"b\" ", NULL);
|
|
ap_rvputs(r, "value=\"", bsel->name + sizeof("balancer://") - 1,
|
|
"\">\n</form>\n", NULL);
|
|
ap_rputs("<hr />\n", r);
|
|
}
|
|
else if (bsel) {
|
|
ap_rputs("<h3>Edit balancer settings for ", r);
|
|
ap_rvputs(r, bsel->name, "</h3>\n", NULL);
|
|
ap_rvputs(r, "<form method=\"GET\" action=\"", NULL);
|
|
ap_rvputs(r, r->uri, "\">\n<dl>", NULL);
|
|
ap_rputs("<table><tr><td>StickySession Identifier:</td><td><input name=\"ss\" type=text ", r);
|
|
if (bsel->sticky)
|
|
ap_rvputs(r, "value=\"", bsel->sticky, "\"", NULL);
|
|
ap_rputs("></td><tr>\n<tr><td>Timeout:</td><td><input name=\"tm\" type=text ", r);
|
|
ap_rprintf(r, "value=\"%" APR_TIME_T_FMT "\"></td></tr>\n",
|
|
apr_time_sec(bsel->timeout));
|
|
ap_rputs("<tr><td colspan=2><input type=submit value=\"Submit\"></td></tr>\n", r);
|
|
ap_rvputs(r, "</table>\n<input type=hidden name=\"b\" ", NULL);
|
|
ap_rvputs(r, "value=\"", bsel->name + sizeof("balancer://") - 1,
|
|
"\">\n</form>\n", NULL);
|
|
ap_rputs("<hr />\n", r);
|
|
}
|
|
ap_rputs(ap_psignature("",r), r);
|
|
ap_rputs("</body></html>\n", r);
|
|
}
|
|
return OK;
|
|
}
|
|
|
|
static void ap_proxy_balancer_register_hook(apr_pool_t *p)
|
|
{
|
|
/* manager handler */
|
|
ap_hook_handler(balancer_handler, NULL, NULL, APR_HOOK_FIRST);
|
|
proxy_hook_pre_request(proxy_balancer_pre_request, NULL, NULL, APR_HOOK_FIRST);
|
|
proxy_hook_post_request(proxy_balancer_post_request, NULL, NULL, APR_HOOK_FIRST);
|
|
}
|
|
|
|
module AP_MODULE_DECLARE_DATA proxy_balancer_module = {
|
|
STANDARD20_MODULE_STUFF,
|
|
NULL, /* create per-directory config structure */
|
|
NULL, /* merge per-directory config structures */
|
|
NULL, /* create per-server config structure */
|
|
NULL, /* merge per-server config structures */
|
|
NULL, /* command apr_table_t */
|
|
ap_proxy_balancer_register_hook /* register hooks */
|
|
};
|