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dumpstats.c
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dumpstats.c
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/*
* Functions dedicated to statistics output
*
* Copyright 2000-2009 Willy Tarreau <w@1wt.eu>
* Copyright 2007-2009 Krzysztof Piotr Oledzki <ole@ans.pl>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pwd.h>
#include <grp.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <common/cfgparse.h>
#include <common/compat.h>
#include <common/config.h>
#include <common/debug.h>
#include <common/memory.h>
#include <common/mini-clist.h>
#include <common/standard.h>
#include <common/ticks.h>
#include <common/time.h>
#include <common/uri_auth.h>
#include <common/version.h>
#include <types/global.h>
#include <proto/backend.h>
#include <proto/buffers.h>
#include <proto/checks.h>
#include <proto/dumpstats.h>
#include <proto/fd.h>
#include <proto/freq_ctr.h>
#include <proto/pipe.h>
#include <proto/proto_uxst.h>
#include <proto/proxy.h>
#include <proto/session.h>
#include <proto/server.h>
#include <proto/stream_interface.h>
#include <proto/task.h>
const char stats_sock_usage_msg[] =
"Unknown command. Please enter one of the following commands only :\n"
" clear counters : clear max statistics counters (add 'all' for all counters)\n"
" help : this message\n"
" prompt : toggle interactive mode with prompt\n"
" quit : disconnect\n"
" show info : report information about the running process\n"
" show stat : report counters for each proxy and server\n"
" show errors : report last request and response errors for each proxy\n"
" show sess [id] : report the list of current sessions or dump this session\n"
" get weight : report a server's current weight\n"
" set weight : change a server's weight\n"
" set timeout : change a timeout setting\n"
" disable server : set a server in maintenance mode\n"
" enable server : re-enable a server that was previously in maintenance mode\n"
" debug sess : stream events about proxied sessions\n"
"";
const char stats_permission_denied_msg[] =
"Permission denied\n"
"";
/* Keep track of sessions that want streaming events (STAT_CLI_EVENT).
*/
int stats_event_enabled = 0;
static struct list stats_event_listeners = LIST_HEAD_INIT(stats_event_listeners);
/* Add a session to the list of event listeners.
*/
static inline void stats_event_listener_add(struct session *s)
{
LIST_ADDQ(&stats_event_listeners, &s->data_ctx.events.list);
stats_event_enabled = 1;
}
/* Remove a session from the list of listeners, but only if it is a
* registered listener. This enables us to invoke the method on all
* disconnecting stats sockets to ensure they are cleaned up, regardless
* of how many times they switch between streaming and other commands.
*/
static inline void stats_event_listener_remove(struct session *s)
{
int found = 0;
struct session *curr;
list_for_each_entry(curr, &stats_event_listeners, data_ctx.events.list) {
if (curr == s) {
found = 1;
break;
}
}
if (found) {
s->data_ctx.events.px = NULL;
s->data_ctx.events.srv = NULL;
LIST_DEL(&s->data_ctx.events.list);
}
if (LIST_ISEMPTY(&stats_event_listeners))
stats_event_enabled = 0;
/* Re-initialize stats output */
memset(&s->data_ctx.stats, 0, sizeof(s->data_ctx.stats));
}
/* Send a message to all registered event listeners.
*/
static inline void stats_event_listener_message_all(char *msg, struct session *s)
{
struct session *curr;
list_for_each_entry(curr, &stats_event_listeners, data_ctx.events.list) {
struct stream_interface *si = &curr->si[1];
struct proxy *px;
struct server *srv;
if (!(si->flags & SI_FL_DONT_WAKE) && si->owner) {
/* filter by proxy and server if required */
if ((px = curr->data_ctx.events.px)) {
if (s->be != px && s->fe != px)
continue; /* ignore */
if ((srv = curr->data_ctx.events.srv)) {
if (s->srv != srv)
continue; /* ignore */
}
}
if (buffer_feed(si->ib, msg) == -1) {
si->ib->flags |= BF_SEND_DONTWAIT;
task_wakeup(si->owner, TASK_WOKEN_MSG);
}
}
}
}
/* allocate a new stats frontend named <name>, and return it
* (or NULL in case of lack of memory).
*/
static struct proxy *alloc_stats_fe(const char *name)
{
struct proxy *fe;
fe = (struct proxy *)calloc(1, sizeof(struct proxy));
if (!fe)
return NULL;
LIST_INIT(&fe->pendconns);
LIST_INIT(&fe->acl);
LIST_INIT(&fe->block_cond);
LIST_INIT(&fe->redirect_rules);
LIST_INIT(&fe->mon_fail_cond);
LIST_INIT(&fe->switching_rules);
LIST_INIT(&fe->tcp_req.inspect_rules);
/* Timeouts are defined as -1, so we cannot use the zeroed area
* as a default value.
*/
proxy_reset_timeouts(fe);
fe->last_change = now.tv_sec;
fe->id = strdup("GLOBAL");
fe->cap = PR_CAP_FE;
return fe;
}
/* This function parses a "stats" statement in the "global" section. It returns
* -1 if there is any error, otherwise zero. If it returns -1, it may write an
* error message into ther <err> buffer, for at most <errlen> bytes, trailing
* zero included. The trailing '\n' must not be written. The function must be
* called with <args> pointing to the first word after "stats".
*/
static int stats_parse_global(char **args, int section_type, struct proxy *curpx,
struct proxy *defpx, char *err, int errlen)
{
args++;
if (!strcmp(args[0], "socket")) {
struct sockaddr_un *su;
int cur_arg;
if (*args[1] == 0) {
snprintf(err, errlen, "'stats socket' in global section expects a path to a UNIX socket");
return -1;
}
if (global.stats_sock.state != LI_NEW) {
snprintf(err, errlen, "'stats socket' already specified in global section");
return -1;
}
su = str2sun(args[1]);
if (!su) {
snprintf(err, errlen, "'stats socket' path would require truncation");
return -1;
}
memcpy(&global.stats_sock.addr, su, sizeof(struct sockaddr_un)); // guaranteed to fit
if (!global.stats_fe) {
if ((global.stats_fe = alloc_stats_fe("GLOBAL")) == NULL) {
snprintf(err, errlen, "out of memory");
return -1;
}
global.stats_fe->timeout.client = MS_TO_TICKS(10000); /* default timeout of 10 seconds */
}
global.stats_sock.state = LI_INIT;
global.stats_sock.options = LI_O_NONE;
global.stats_sock.accept = uxst_event_accept;
global.stats_sock.handler = process_session;
global.stats_sock.analysers = 0;
global.stats_sock.nice = -64; /* we want to boost priority for local stats */
global.stats_sock.private = global.stats_fe; /* must point to the frontend */
global.stats_sock.perm.ux.level = ACCESS_LVL_OPER; /* default access level */
global.stats_sock.timeout = &global.stats_fe->timeout.client;
global.stats_sock.next = global.stats_fe->listen;
global.stats_fe->listen = &global.stats_sock;
cur_arg = 2;
while (*args[cur_arg]) {
if (!strcmp(args[cur_arg], "uid")) {
global.stats_sock.perm.ux.uid = atol(args[cur_arg + 1]);
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "gid")) {
global.stats_sock.perm.ux.gid = atol(args[cur_arg + 1]);
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "mode")) {
global.stats_sock.perm.ux.mode = strtol(args[cur_arg + 1], NULL, 8);
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "user")) {
struct passwd *user;
user = getpwnam(args[cur_arg + 1]);
if (!user) {
snprintf(err, errlen, "unknown user '%s' in 'global' section ('stats user')",
args[cur_arg + 1]);
return -1;
}
global.stats_sock.perm.ux.uid = user->pw_uid;
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "group")) {
struct group *group;
group = getgrnam(args[cur_arg + 1]);
if (!group) {
snprintf(err, errlen, "unknown group '%s' in 'global' section ('stats group')",
args[cur_arg + 1]);
return -1;
}
global.stats_sock.perm.ux.gid = group->gr_gid;
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "level")) {
if (!strcmp(args[cur_arg+1], "user"))
global.stats_sock.perm.ux.level = ACCESS_LVL_USER;
else if (!strcmp(args[cur_arg+1], "operator"))
global.stats_sock.perm.ux.level = ACCESS_LVL_OPER;
else if (!strcmp(args[cur_arg+1], "admin"))
global.stats_sock.perm.ux.level = ACCESS_LVL_ADMIN;
else {
snprintf(err, errlen, "'stats socket level' only supports 'user', 'operator', and 'admin'");
return -1;
}
cur_arg += 2;
}
else {
snprintf(err, errlen, "'stats socket' only supports 'user', 'uid', 'group', 'gid', 'level', and 'mode'");
return -1;
}
}
uxst_add_listener(&global.stats_sock);
global.maxsock++;
}
else if (!strcmp(args[0], "timeout")) {
unsigned timeout;
const char *res = parse_time_err(args[1], &timeout, TIME_UNIT_MS);
if (res) {
snprintf(err, errlen, "unexpected character '%c' in 'stats timeout' in 'global' section", *res);
return -1;
}
if (!timeout) {
snprintf(err, errlen, "a positive value is expected for 'stats timeout' in 'global section'");
return -1;
}
if (!global.stats_fe) {
if ((global.stats_fe = alloc_stats_fe("GLOBAL")) == NULL) {
snprintf(err, errlen, "out of memory");
return -1;
}
}
global.stats_fe->timeout.client = MS_TO_TICKS(timeout);
}
else if (!strcmp(args[0], "maxconn")) {
int maxconn = atol(args[1]);
if (maxconn <= 0) {
snprintf(err, errlen, "a positive value is expected for 'stats maxconn' in 'global section'");
return -1;
}
global.maxsock -= global.stats_sock.maxconn;
global.stats_sock.maxconn = maxconn;
global.maxsock += global.stats_sock.maxconn;
}
else {
snprintf(err, errlen, "'stats' only supports 'socket', 'maxconn' and 'timeout' in 'global' section");
return -1;
}
return 0;
}
int print_csv_header(struct chunk *msg)
{
return chunk_printf(msg,
"# pxname,svname,"
"qcur,qmax,"
"scur,smax,slim,stot,"
"bin,bout,"
"dreq,dresp,"
"ereq,econ,eresp,"
"wretr,wredis,"
"status,weight,act,bck,"
"chkfail,chkdown,lastchg,downtime,qlimit,"
"pid,iid,sid,throttle,lbtot,tracked,type,"
"rate,rate_lim,rate_max,"
"check_status,check_code,check_duration,"
"hrsp_1xx,hrsp_2xx,hrsp_3xx,hrsp_4xx,hrsp_5xx,hrsp_other,hanafail,"
"req_rate,req_rate_max,req_tot,"
"cli_abrt,srv_abrt,"
"\n");
}
/* Processes the stats interpreter on the statistics socket. This function is
* called from an applet running in a stream interface. The function returns 1
* if the request was understood, otherwise zero. It sets si->st0 to a value
* designating the function which will have to process the request, which can
* also be the print function to display the return message set into cli.msg.
*/
int stats_sock_parse_request(struct stream_interface *si, char *line)
{
struct session *s = si->private;
char *args[MAX_STATS_ARGS + 1];
int arg;
while (isspace((unsigned char)*line))
line++;
arg = 0;
args[arg] = line;
while (*line && arg < MAX_STATS_ARGS) {
if (isspace((unsigned char)*line)) {
*line++ = '\0';
while (isspace((unsigned char)*line))
line++;
args[++arg] = line;
continue;
}
line++;
}
while (++arg <= MAX_STATS_ARGS)
args[arg] = line;
s->data_ctx.stats.flags = 0;
if (strcmp(args[0], "debug") == 0) {
if (strcmp(args[1], "sess") == 0) {
if (s->listener->perm.ux.level < ACCESS_LVL_OPER) {
s->data_ctx.cli.msg = stats_permission_denied_msg;
si->st0 = STAT_CLI_PRINT;
return 1;
}
if (*args[2] && !strncmp(args[2], "proxy", 5)) {
struct proxy *px = NULL;
struct server *srv = NULL;
char *px_name = args[2] + 6, *srv_name;
if ((srv_name = strchr(px_name, ':'))) {
*srv_name = 0;
srv_name += 1;
}
px = findproxy(px_name, PR_CAP_FE|PR_CAP_BE);
if (!px) {
s->data_ctx.cli.msg = "Invalid proxy filter for event stream.";
si->st0 = STAT_CLI_PRINT;
return 1;
}
if (srv_name && *srv_name) {
srv = findserver(px, srv_name);
if (!srv) {
s->data_ctx.cli.msg = "Invalid server filter for event stream.";
si->st0 = STAT_CLI_PRINT;
return 1;
}
}
s->data_ctx.events.srv = srv;
s->data_ctx.events.px = px;
} else {
s->data_ctx.events.srv = NULL;
s->data_ctx.events.px = NULL;
}
stats_event_listener_add(s);
si->st0 = STAT_CLI_EVENTS;
}
}
else if (strcmp(args[0], "show") == 0) {
if (strcmp(args[1], "stat") == 0) {
if (*args[2] && *args[3] && *args[4]) {
s->data_ctx.stats.flags |= STAT_BOUND;
s->data_ctx.stats.iid = atoi(args[2]);
s->data_ctx.stats.type = atoi(args[3]);
s->data_ctx.stats.sid = atoi(args[4]);
}
s->data_ctx.stats.flags |= STAT_SHOW_STAT;
s->data_ctx.stats.flags |= STAT_FMT_CSV;
s->data_state = DATA_ST_INIT;
si->st0 = STAT_CLI_O_INFO; // stats_dump_raw_to_buffer
}
else if (strcmp(args[1], "info") == 0) {
s->data_ctx.stats.flags |= STAT_SHOW_INFO;
s->data_ctx.stats.flags |= STAT_FMT_CSV;
s->data_state = DATA_ST_INIT;
si->st0 = STAT_CLI_O_INFO; // stats_dump_raw_to_buffer
}
else if (strcmp(args[1], "sess") == 0) {
s->data_state = DATA_ST_INIT;
if (s->listener->perm.ux.level < ACCESS_LVL_OPER) {
s->data_ctx.cli.msg = stats_permission_denied_msg;
si->st0 = STAT_CLI_PRINT;
return 1;
}
if (*args[2])
s->data_ctx.sess.target = (void *)strtoul(args[2], NULL, 0);
else
s->data_ctx.sess.target = NULL;
s->data_ctx.sess.section = 0; /* start with session status */
s->data_ctx.sess.pos = 0;
si->st0 = STAT_CLI_O_SESS; // stats_dump_sess_to_buffer
}
else if (strcmp(args[1], "errors") == 0) {
if (s->listener->perm.ux.level < ACCESS_LVL_OPER) {
s->data_ctx.cli.msg = stats_permission_denied_msg;
si->st0 = STAT_CLI_PRINT;
return 1;
}
if (*args[2])
s->data_ctx.errors.iid = atoi(args[2]);
else
s->data_ctx.errors.iid = -1;
s->data_ctx.errors.px = NULL;
s->data_state = DATA_ST_INIT;
si->st0 = STAT_CLI_O_ERR; // stats_dump_errors_to_buffer
}
else { /* neither "stat" nor "info" nor "sess" nor "errors" nor "events" */
return 0;
}
}
else if (strcmp(args[0], "clear") == 0) {
if (strcmp(args[1], "counters") == 0) {
struct proxy *px;
struct server *sv;
struct listener *li;
int clrall = 0;
if (strcmp(args[2], "all") == 0)
clrall = 1;
/* check permissions */
if (s->listener->perm.ux.level < ACCESS_LVL_OPER ||
(clrall && s->listener->perm.ux.level < ACCESS_LVL_ADMIN)) {
s->data_ctx.cli.msg = stats_permission_denied_msg;
si->st0 = STAT_CLI_PRINT;
return 1;
}
for (px = proxy; px; px = px->next) {
if (clrall)
memset(&px->counters, 0, sizeof(px->counters));
else {
px->counters.feconn_max = 0;
px->counters.beconn_max = 0;
px->counters.fe_rps_max = 0;
px->counters.fe_sps_max = 0;
px->counters.be_sps_max = 0;
px->counters.nbpend_max = 0;
}
for (sv = px->srv; sv; sv = sv->next)
if (clrall)
memset(&sv->counters, 0, sizeof(sv->counters));
else {
sv->counters.cur_sess_max = 0;
sv->counters.nbpend_max = 0;
sv->counters.sps_max = 0;
}
for (li = px->listen; li; li = li->next)
if (li->counters) {
if (clrall)
memset(li->counters, 0, sizeof(*li->counters));
else
li->counters->conn_max = 0;
}
}
return 1;
}
else {
return 0;
}
}
else if (strcmp(args[0], "get") == 0) {
if (strcmp(args[1], "weight") == 0) {
struct proxy *px;
struct server *sv;
/* split "backend/server" and make <line> point to server */
for (line = args[2]; *line; line++)
if (*line == '/') {
*line++ = '\0';
break;
}
if (!*line) {
s->data_ctx.cli.msg = "Require 'backend/server'.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
if (!get_backend_server(args[2], line, &px, &sv)) {
s->data_ctx.cli.msg = px ? "No such server.\n" : "No such backend.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
/* return server's effective weight at the moment */
snprintf(trash, sizeof(trash), "%d (initial %d)\n", sv->uweight, sv->iweight);
buffer_feed(si->ib, trash);
return 1;
}
else { /* not "get weight" */
return 0;
}
}
else if (strcmp(args[0], "set") == 0) {
if (strcmp(args[1], "weight") == 0) {
struct proxy *px;
struct server *sv;
int w;
if (s->listener->perm.ux.level < ACCESS_LVL_ADMIN) {
s->data_ctx.cli.msg = stats_permission_denied_msg;
si->st0 = STAT_CLI_PRINT;
return 1;
}
/* split "backend/server" and make <line> point to server */
for (line = args[2]; *line; line++)
if (*line == '/') {
*line++ = '\0';
break;
}
if (!*line || !*args[3]) {
s->data_ctx.cli.msg = "Require 'backend/server' and 'weight' or 'weight%'.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
if (!get_backend_server(args[2], line, &px, &sv)) {
s->data_ctx.cli.msg = px ? "No such server.\n" : "No such backend.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
if (px->state == PR_STSTOPPED) {
s->data_ctx.cli.msg = "Proxy is disabled.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
/* if the weight is terminated with '%', it is set relative to
* the initial weight, otherwise it is absolute.
*/
w = atoi(args[3]);
if (strchr(args[3], '%') != NULL) {
if (w < 0 || w > 100) {
s->data_ctx.cli.msg = "Relative weight can only be set between 0 and 100% inclusive.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
w = sv->iweight * w / 100;
}
else {
if (w < 0 || w > 256) {
s->data_ctx.cli.msg = "Absolute weight can only be between 0 and 256 inclusive.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
}
if (w && w != sv->iweight && !(px->lbprm.algo & BE_LB_PROP_DYN)) {
s->data_ctx.cli.msg = "Backend is using a static LB algorithm and only accepts weights '0%' and '100%'.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
sv->uweight = w;
if (px->lbprm.algo & BE_LB_PROP_DYN) {
/* we must take care of not pushing the server to full throttle during slow starts */
if ((sv->state & SRV_WARMINGUP) && (px->lbprm.algo & BE_LB_PROP_DYN))
sv->eweight = (BE_WEIGHT_SCALE * (now.tv_sec - sv->last_change) + sv->slowstart - 1) / sv->slowstart;
else
sv->eweight = BE_WEIGHT_SCALE;
sv->eweight *= sv->uweight;
} else {
sv->eweight = sv->uweight;
}
/* static LB algorithms are a bit harder to update */
if (px->lbprm.update_server_eweight)
px->lbprm.update_server_eweight(sv);
else if (sv->eweight)
px->lbprm.set_server_status_up(sv);
else
px->lbprm.set_server_status_down(sv);
return 1;
}
else if (strcmp(args[1], "timeout") == 0) {
if (strcmp(args[2], "cli") == 0) {
unsigned timeout;
const char *res;
if (!*args[3]) {
s->data_ctx.cli.msg = "Expects an integer value.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
res = parse_time_err(args[3], &timeout, TIME_UNIT_S);
if (res || timeout < 1) {
s->data_ctx.cli.msg = "Invalid timeout value.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
s->req->rto = s->rep->wto = 1 + MS_TO_TICKS(timeout*1000);
return 1;
}
else {
s->data_ctx.cli.msg = "'set timeout' only supports 'cli'.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
}
else { /* unknown "set" parameter */
return 0;
}
}
else if (strcmp(args[0], "enable") == 0) {
if (strcmp(args[1], "server") == 0) {
struct proxy *px;
struct server *sv;
if (s->listener->perm.ux.level < ACCESS_LVL_ADMIN) {
s->data_ctx.cli.msg = stats_permission_denied_msg;
si->st0 = STAT_CLI_PRINT;
return 1;
}
/* split "backend/server" and make <line> point to server */
for (line = args[2]; *line; line++)
if (*line == '/') {
*line++ = '\0';
break;
}
if (!*line || !*args[2]) {
s->data_ctx.cli.msg = "Require 'backend/server'.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
if (!get_backend_server(args[2], line, &px, &sv)) {
s->data_ctx.cli.msg = px ? "No such server.\n" : "No such backend.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
if (px->state == PR_STSTOPPED) {
s->data_ctx.cli.msg = "Proxy is disabled.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
if (sv->state & SRV_MAINTAIN) {
/* The server is really in maintenance, we can change the server state */
if (sv->tracked) {
/* If this server tracks the status of another one,
* we must restore the good status.
*/
if (sv->tracked->state & SRV_RUNNING) {
set_server_up(sv);
sv->health = sv->rise; /* up, but will fall down at first failure */
} else {
sv->state &= ~SRV_MAINTAIN;
set_server_down(sv);
}
} else {
set_server_up(sv);
sv->health = sv->rise; /* up, but will fall down at first failure */
}
}
return 1;
}
else { /* unknown "enable" parameter */
return 0;
}
}
else if (strcmp(args[0], "disable") == 0) {
if (strcmp(args[1], "server") == 0) {
struct proxy *px;
struct server *sv;
if (s->listener->perm.ux.level < ACCESS_LVL_ADMIN) {
s->data_ctx.cli.msg = stats_permission_denied_msg;
si->st0 = STAT_CLI_PRINT;
return 1;
}
/* split "backend/server" and make <line> point to server */
for (line = args[2]; *line; line++)
if (*line == '/') {
*line++ = '\0';
break;
}
if (!*line || !*args[2]) {
s->data_ctx.cli.msg = "Require 'backend/server'.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
if (!get_backend_server(args[2], line, &px, &sv)) {
s->data_ctx.cli.msg = px ? "No such server.\n" : "No such backend.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
if (px->state == PR_STSTOPPED) {
s->data_ctx.cli.msg = "Proxy is disabled.\n";
si->st0 = STAT_CLI_PRINT;
return 1;
}
if (! (sv->state & SRV_MAINTAIN)) {
/* Not already in maintenance, we can change the server state */
sv->state |= SRV_MAINTAIN;
set_server_down(sv);
}
return 1;
}
else { /* unknown "disable" parameter */
return 0;
}
}
else { /* not "show" nor "clear" nor "get" nor "set" nor "enable" nor "disable" */
return 0;
}
return 1;
}
/* This I/O handler runs as an applet embedded in a stream interface. It is
* used to processes I/O from/to the stats unix socket. The system relies on a
* state machine handling requests and various responses. We read a request,
* then we process it and send the response, and we possibly display a prompt.
* Then we can read again. The state is stored in si->st0 and is one of the
* STAT_CLI_* constants. si->st1 is used to indicate whether prompt is enabled
* or not.
*/
void stats_io_handler(struct stream_interface *si)
{
struct session *s = si->private;
struct buffer *req = si->ob;
struct buffer *res = si->ib;
int reql;
int len;
if (unlikely(si->state == SI_ST_DIS || si->state == SI_ST_CLO))
goto out;
while (1) {
if (si->st0 == STAT_CLI_INIT) {
/* Stats output not initialized yet */
memset(&s->data_ctx.stats, 0, sizeof(s->data_ctx.stats));
s->data_source = DATA_SRC_STATS;
si->st0 = STAT_CLI_GETREQ;
}
else if (si->st0 == STAT_CLI_END) {
/* Let's close for real now. We just close the request
* side, the conditions below will complete if needed.
*/
si->shutw(si);
break;
}
else if (si->st0 == STAT_CLI_GETREQ || si->st0 == STAT_CLI_EVENTS) {
/* ensure we have some output room left in the event we
* would want to return some info right after parsing.
*/
if (buffer_almost_full(si->ib))
break;
reql = buffer_si_peekline(si->ob, trash, sizeof(trash));
if (reql <= 0) { /* closed or EOL not found */
if (reql == 0)
break;
si->st0 = STAT_CLI_END;
continue;
}
/* seek for a possible semi-colon. If we find one, we
* replace it with an LF and skip only this part.
*/
for (len = 0; len < reql; len++)
if (trash[len] == ';') {
trash[len] = '\n';
reql = len + 1;
break;
}
/* now it is time to check that we have a full line,
* remove the trailing \n and possibly \r, then cut the
* line.
*/
len = reql - 1;
if (trash[len] != '\n') {
si->st0 = STAT_CLI_END;
continue;
}
if (len && trash[len-1] == '\r')
len--;
trash[len] = '\0';
if (si->st0 == STAT_CLI_EVENTS)
stats_event_listener_remove(s);
si->st0 = STAT_CLI_PROMPT;
if (len) {
if (strcmp(trash, "quit") == 0) {
si->st0 = STAT_CLI_END;
continue;
}
else if (strcmp(trash, "prompt") == 0)
si->st1 = !si->st1;
else if (strcmp(trash, "help") == 0 ||
!stats_sock_parse_request(si, trash)) {
s->data_ctx.cli.msg = stats_sock_usage_msg;
si->st0 = STAT_CLI_PRINT;
}
/* NB: stats_sock_parse_request() may have put
* another STAT_CLI_O_* into si->st0.
*/
}
else if (!si->st1) {
/* if prompt is disabled, print help on empty lines,
* so that the user at least knows how to enable
* prompt and find help.
*/
s->data_ctx.cli.msg = stats_sock_usage_msg;
si->st0 = STAT_CLI_PRINT;
}
/* re-adjust req buffer */
buffer_skip(si->ob, reql);
req->flags |= BF_READ_DONTWAIT; /* we plan to read small requests */
}
else { /* output functions: first check if the output buffer is closed then abort */
if (res->flags & (BF_SHUTR_NOW|BF_SHUTR)) {
si->st0 = STAT_CLI_END;
continue;
}
switch (si->st0) {
case STAT_CLI_PRINT:
if (buffer_feed(si->ib, s->data_ctx.cli.msg) < 0)
si->st0 = STAT_CLI_PROMPT;
break;
case STAT_CLI_O_INFO:
if (stats_dump_raw_to_buffer(s, res))
si->st0 = STAT_CLI_PROMPT;
break;
case STAT_CLI_O_SESS:
if (stats_dump_sess_to_buffer(s, res))
si->st0 = STAT_CLI_PROMPT;
break;
case STAT_CLI_O_ERR: /* errors dump */
if (stats_dump_errors_to_buffer(s, res))
si->st0 = STAT_CLI_PROMPT;
break;
default: /* abnormal state */
si->st0 = STAT_CLI_PROMPT;
break;
}
/* The post-command prompt is either LF alone or LF + '> ' in interactive mode */
if (si->st0 == STAT_CLI_PROMPT) {
if (buffer_feed(si->ib, si->st1 ? "\n> " : "\n") < 0)
si->st0 = STAT_CLI_GETREQ;
}
/* If the output functions are still there, it means they require more room. */
if (si->st0 >= STAT_CLI_OUTPUT)
break;
/* Now we close the output if one of the writers did so,
* or if we're not in interactive mode and the request
* buffer is empty. This still allows pipelined requests
* to be sent in non-interactive mode.
*/
if ((res->flags & (BF_SHUTW|BF_SHUTW_NOW)) || (!si->st1 && !req->send_max)) {
si->st0 = STAT_CLI_END;
continue;
}
/* switch state back to GETREQ to read next requests */
si->st0 = STAT_CLI_GETREQ;
}
}
if ((res->flags & BF_SHUTR) && (si->state == SI_ST_EST) && (si->st0 != STAT_CLI_GETREQ)) {
DPRINTF(stderr, "%s@%d: si to buf closed. req=%08x, res=%08x, st=%d\n",
__FUNCTION__, __LINE__, req->flags, res->flags, si->state);
/* Other side has closed, let's abort if we have no more processing to do
* and nothing more to consume. This is comparable to a broken pipe, so
* we forward the close to the request side so that it flows upstream to
* the client.
*/
si->shutw(si);
}
if ((req->flags & BF_SHUTW) && (si->state == SI_ST_EST) && (si->st0 < STAT_CLI_OUTPUT)) {
DPRINTF(stderr, "%s@%d: buf to si closed. req=%08x, res=%08x, st=%d\n",
__FUNCTION__, __LINE__, req->flags, res->flags, si->state);
/* We have no more processing to do, and nothing more to send, and
* the client side has closed. So we'll forward this state downstream
* on the response buffer.
*/
si->shutr(si);
res->flags |= BF_READ_NULL;
}
/* update all other flags and resync with the other side */
si->update(si);
/* we don't want to expire timeouts while we're processing requests */
si->ib->rex = TICK_ETERNITY;
si->ob->wex = TICK_ETERNITY;
out:
DPRINTF(stderr, "%s@%d: st=%d, rqf=%x, rpf=%x, rql=%d, rqs=%d, rl=%d, rs=%d\n",
__FUNCTION__, __LINE__,
si->state, req->flags, res->flags, req->l, req->send_max, res->l, res->send_max);
if (unlikely(si->state == SI_ST_DIS || si->state == SI_ST_CLO)) {
stats_event_listener_remove(s);
/* check that we have released everything then unregister */
stream_int_unregister_handler(si);
}
}