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statsproxy.c
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// ========================================================================
//
// Project : statsproxy
//
// Version : 1.0
//
// Copyright :
//
// Software License Agreement (BSD License)
//
// Copyright (c) 2009, Gear Six, Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//
// * Neither the name of Gear Six, Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.The Gear Six logo,
// which is provided in the source code and appears on the user interface
// to identify Gear Six, Inc. as the originator of the software program, is
// a trademark of Gear Six, Inc. and can be used only in unaltered form and
// only for purposes of such identification.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// ========================================================================
//
#include <stdio.h>
#include <inttypes.h>
#include <netdb.h>
#include <assert.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <pthread.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <time.h>
#include "queue.h"
#include "statsproxy.h"
#include "proxylog.h"
#include "mcr_web.h"
#include "uristrings.h"
static char sysLogo[] =
#include "g6logo.inc"
// return a millisecond timestamp
static uint64_t
timestamp(void)
{
int rc;
struct timeval tv;
rc = gettimeofday(&tv, NULL);
return tv.tv_sec * 1000 + tv.tv_usec / 1000;
}
// single threaded!
char *
addr2host(const struct sockaddr_in *addr)
{
static char hostname[MAXHOSTNAMELEN];
struct hostent *hp = NULL;
char *dot = NULL;
hp = gethostbyaddr((char *) &addr->sin_addr.s_addr,
sizeof (struct in_addr), AF_INET);
if (hp) {
strncpy(hostname, hp->h_name, MAXHOSTNAMELEN - 1);
dot = strchr(hostname, '.');
if (dot) {
*dot = '\0'; // trim the fqdn
}
return hostname;
} else {
return inet_ntoa(addr->sin_addr);
}
}
int
host2addr(const char *host, struct sockaddr_in *addr)
{
struct hostent *myEnt;
if (host == NULL || addr == NULL) {
return EINVAL;
}
if ((addr->sin_addr.s_addr = inet_addr(host)) != INADDR_NONE) {
// dot format IP address given
} else {
// look up host name
if ((myEnt = gethostbyname(host)) != NULL) {
addr->sin_addr.s_addr = *((uint32_t *) myEnt->h_addr);
} else {
// gethostbyname failed
return ENOENT;
}
}
return 0;
}
// some simple html goop
static void
write_page_refresh(int refresh_ms, FILE *fp)
{
fprintf(fp,
"<script language=\"JavaScript\"> "
"var sURL = unescape(window.location.pathname); "
"function doLoad() { setTimeout( \"refresh()\", %d ); } "
"function refresh() { window.location.href = sURL; } "
"</script> "
"<script language=\"JavaScript1.1\"> "
"function refresh() { window.location.replace( sURL ); } "
"</script> "
"<script language=\"JavaScript1.2\"> "
"function refresh() { window.location.reload( false ); } "
"</script>\r\n"
"<BODY onload=\"doLoad()\"> \r\n", refresh_ms);
}
static char *
rfc1123date(char *datestr, time_t t)
{
struct tm *tm;
tm = localtime(&t);
strftime(datestr, DATEBUFSZ, "%a %d %m %Y %H:%M:%S", tm);
return datestr;
}
static void
write_http_header(const char *mimeType, FILE *http)
{
char dateBuf[DATEBUFSZ], lastModifiedBuf[DATEBUFSZ];
time_t now;
time(&now);
fprintf(http,
"HTTP/1.1 200 OK\r\n"
"X-Date: %s\r\n"
"Server: Gear6 Memcached\r\n"
"MIME-version: 1.0\r\n"
"Last-Modified: %s\r\n"
"Cache-Control: no-cache\r\n"
"Content-type: %s\r\n\r\n",
rfc1123date(dateBuf, now), rfc1123date(lastModifiedBuf, now), mimeType);
}
static void
write_html_image(FILE *http, char *bits, int size)
{
write_http_header("image/png", http);
fwrite(bits, size, 1, http);
}
static void
write_html_body(FILE *http)
{
char hostname[HOSTSZ];
gethostname(hostname, HOSTSZ);
fprintf(http,
"<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">\r\n"
"<HTML>\r\n"
"<TITLE>%s - Gear6 Memcached</TITLE>\r\n",
hostname);
}
static void
write_html_service_info(proxyclient_t *clnt, int vipLabel)
{
time_t now;
char timeBuf[DATEBUFSZ];
backend_t *bep = clnt->bep;
struct uri_entry *entry;
struct in_addr addr;
time(&now);
ctime_r(&now, timeBuf);
timeBuf[strlen(timeBuf) - 1] = '\0'; // zap newline
addr.s_addr = bep->settings.backaddr;
if (vipLabel) {
fprintf(clnt->fp, "<a href=\"http://%s\">"
"<img border=\"0\" src=\"logo.png\" alt=\"Logo\" "
"align=\"absmiddle\"/></a>"
" Memcache Information for "
"<b>%s:%d</b> "
"<font size=\"-1\">(proxy %s:%d)</font> "
"%s<br>",
bep->settings.backhost,
bep->settings.backhost,
bep->settings.backport,
bep->settings.fronthost,
bep->settings.frontport,
timeBuf);
} else {
fprintf(clnt->fp, "<a href=\"http://%s\">"
"<img border=\"0\" src=\"logo.png\" alt=\"Logo\" "
"align=\"absmiddle\"/></a>"
" <b>Memcache Reporter</b> %s",
bep->settings.backhost, timeBuf);
}
fprintf(clnt->fp, "<hr>Raw stats: \r\n");
fprintf(clnt->fp, "<b><a href=\"/\">basic</a></b> ");
TAILQ_FOREACH(entry, &bep->uris, next) {
fprintf(clnt->fp, "<b><a href=\"%s\">%s</a></b> ",
entry->uri, entry->uri);
}
/* if memcache reporter is turned off; print nothing. */
if (strcmp(bep->settings.reporter, "off") != 0) {
fprintf(clnt->fp, "<br>Memcache Reporter stats: "
"[<i>top clients by: </i><b>"
"<a href=\"top-clients-ops?addr=%s&port=%hd&key=ops\">ops</a> "
"<a href=\"top-keys-select?addr=%s&port=%hd\">keys</a>"
"</b>] "
"[<i>top keys by: </i><b>"
"<a href=\"top-keys-gets?addr=%s&port=%hd\">gets</a> "
"<a href=\"top-keys-sets?addr=%s&port=%hd\">sets</a> "
"<a href=\"top-keys-all?addr=%s&port=%hd\">all</a>"
"</b>] ",
inet_ntoa(addr), bep->settings.backport,
inet_ntoa(addr), bep->settings.backport,
inet_ntoa(addr), bep->settings.backport,
inet_ntoa(addr), bep->settings.backport,
inet_ntoa(addr), bep->settings.backport);
/* if memcache reporter is configured in the read-only or "view"
* mode then do not provide a config option. in other words if
* the memcache reporter section reads "modify" provide the
* config option.
* */
if (strcmp(bep->settings.reporter, "modify") == 0) {
fprintf(clnt->fp,
"[<i>settings: </i>"
"<a href=\"mcr-config\">config</a> \n"
"] ");
}
}
fprintf(clnt->fp, "<br><br><i>[polling interval: %dms, ",
bep->settings.pollfreq_ms);
fprintf(clnt->fp, "webpage refresh interval: %dms, ",
bep->settings.refreshfreq_ms);
fprintf(clnt->fp, "connect/read/write timeout: %d/%d/%dms]</i><br>\n",
bep->settings.connect_ms,
bep->settings.read_ms,
bep->settings.write_ms);
fprintf(clnt->fp, "<hr>\r\n");
}
static void
end_html_body(FILE *fp)
{
/* print statsproxy version number.
* */
fprintf(fp, "<hr>\r\n");
fprintf(fp, "Generated by statsproxy %s\r\n", VERSION);
/* end html body. */
fprintf(fp, "</BODY>\r\n");
fprintf(fp, "</HTML>\r\n");
}
static void *handleFrontendRequest(void *);
static void *
runFrontend(void *arg)
{
backend_t *bep = (backend_t *) arg;
int sockfd;
int newsockfd;
int reuse = 1;
int clilen;
struct sockaddr_in cli_addr;
struct sockaddr_in serv_addr;
pthread_t chld_thr;
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
proxylog(LOG_ERR, "error - can't open socket - server for %s:%d "
"unavailable",
bep->settings.fronthost,
bep->settings.frontport);
exit(1);
}
memset((char *) &serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
if (host2addr(bep->settings.fronthost, &serv_addr) != 0) {
proxylog(LOG_ERR, "%s: failed to resolve host %s", __FUNCTION__,
bep->settings.fronthost);
exit(1);
}
serv_addr.sin_port = htons(bep->settings.frontport);
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
proxylog(LOG_ERR, "error - can't bind socket for %s:%d",
bep->settings.fronthost, bep->settings.frontport);
exit(1);
}
listen(sockfd, LISTEN_BACKLOG);
for (;;){
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, (socklen_t *)
&clilen);
if (newsockfd < 0) {
proxylog(LOG_ERR, "server accept error for %s:%d: %s",
bep->settings.fronthost, bep->settings.frontport,
strerror(errno));
usleep(ACCEPT_BACKOFF); // slow down the inbounds
continue;
}
proxyclient_t *clnt = (proxyclient_t *) calloc(1, sizeof *clnt);
alloc_fail_check(clnt);
clnt->fd = newsockfd;
clnt->bep = bep;
if (pthread_create(&chld_thr, NULL, handleFrontendRequest,
(void *) clnt) != 0) {
proxylog(LOG_ERR, "could not create thread for %s:%d: %s",
bep->settings.fronthost, bep->settings.frontport,
strerror(errno));
exit(1);
}
pthread_detach(chld_thr);
}
// not reached
return NULL;
}
static callback_t
findCallback(proxyclient_t *clnt, char *uri)
{
struct settings *config = clnt->bep->config;
struct confed_uri *system_uri;
struct uri_entry *bep_entry;
// check system uris first
TAILQ_FOREACH(system_uri, &config->sys.uris, next) {
if (strcmp(system_uri->uri, uri) == 0) {
return system_uri->cb;
}
}
// check backend specific uris (stats)
TAILQ_FOREACH(bep_entry, &clnt->bep->uris, next) {
if (strcmp(bep_entry->uri, uri) == 0) {
return bep_entry->cb;
}
}
return NULL;
}
static void
setClientType(proxyclient_t *clnt, char *method)
{
if (strcmp(method, "stats") == 0) {
clnt->type = MEMCACHE_CLIENT;
} else {
clnt->type = HTTP_CLIENT;
}
}
static bool_t
badMethod(char *method)
{
if (method == NULL) {
return TRUE;
}
if (strcmp(method, "GET") == 0) {
return FALSE;
}
if (strcmp(method, "POST") == 0) {
return FALSE;
}
if (strcmp(method, "stats") == 0) {
return FALSE;
}
return TRUE;
}
static void
clntRedirect(proxyclient_t *clnt, int httpCode, const char *uri)
{
switch (httpCode) {
case HTTP_MOVEPERM:
case HTTP_MOVETEMP:
fprintf(clnt->fp, "HTTP/%d.%d %d %s\r\nLocation: %s\r\n",
HTTP_MAJOR, HTTP_MINOR, httpCode, "Found", uri);
break;
default:
fprintf(clnt->fp, "HTTP/%d.%d %d %s\r\n",
HTTP_MAJOR, HTTP_MINOR, httpCode, "ERROR");
}
}
static void
clntError(proxyclient_t *clnt, int httpCode, char *uri)
{
if (clnt->type == MEMCACHE_CLIENT) {
if (clnt->bep->last_error == 0) {
fprintf(clnt->fp, "ERROR\r\n");
} else {
fprintf(clnt->fp, "ERROR (%s:%d - %s)\r\n",
clnt->bep->settings.backhost,
clnt->bep->settings.backport,
strerror(clnt->bep->last_error));
}
return;
}
switch (httpCode) {
case HTTP_NOTFOUND:
fprintf(clnt->fp, ERR_404, uri);
break;
case HTTP_SERVUNAVAIL:
write_http_header("text/html", clnt->fp);
write_html_body(clnt->fp);
write_page_refresh(clnt->bep->settings.refreshfreq_ms, clnt->fp);
write_html_service_info(clnt, TRUE);
fprintf(clnt->fp,
"Error getting stats from remote memcached: <b>%s</b>",
strerror(clnt->bep->last_error));
end_html_body(clnt->fp);
break;
default:
fprintf(clnt->fp, "HTTP/%d.%d %d %s\r\n",
HTTP_MAJOR, HTTP_MINOR, httpCode, "ERROR");
}
}
static int
countStat(struct uri_entry *uri_entry, const char *name)
{
struct stats_entry *entry;
int count = 0;
TAILQ_FOREACH(entry, &uri_entry->stats, next) {
if (strcmp(entry->name, name) == 0) {
count++;
}
}
return count;
}
static void
rawPrintStats(char *uri, struct uri_entry *uri_entry, FILE *fp)
{
struct stats_entry *entry;
TAILQ_FOREACH(entry, &uri_entry->stats, next) {
if (countStat(uri_entry, entry->name) > 1) {
proxylog(LOG_ERR, "dupe stat %s detected", entry->name);
}
if (entry->type == ALPHA) {
fprintf(fp, "STAT %s %s\r\n", entry->name, entry->v.valueStr);
} else {
fprintf(fp, "STAT %s %"PRIu64"\r\n", entry->name, entry->v.value);
}
}
fprintf(fp, "END\r\n");
}
static void
htmlPrintStats(char *uri, struct uri_entry *uri_entry, FILE *fp)
{
struct stats_entry *entry;
TAILQ_FOREACH(entry, &uri_entry->stats, next) {
if (entry->type == ALPHA) {
fprintf(fp,
"<font size=\"-2\">STAT</font> <i>%s</i> <b>%s</b><br>",
entry->name, entry->v.valueStr);
} else {
fprintf(fp,
"<font size=\"-2\">STAT</font> <i>%s</i> <b>%"PRIu64
"</b><br>",
entry->name, entry->v.value);
}
}
}
// deliver cached stats
static int
statsCallback(void *arg, char *uri)
{
int closeConnection = TRUE;
proxyclient_t *clnt = (proxyclient_t *) arg;
backend_t *bep = clnt->bep;
struct uri_entry *entry = NULL;
// find the uri
TAILQ_FOREACH(entry, &bep->uris, next) {
if (strcmp(entry->uri, uri) == 0) {
break;
}
}
if (entry == NULL) {
clntError(clnt, HTTP_NOTFOUND, uri);
goto bail;
}
rdlock(clnt->bep);
if (clnt->bep->state != POLLING) {
clntError(clnt, HTTP_SERVUNAVAIL, uri);
unlock(clnt->bep);
goto bail;
}
// deliver the stays chain hanging off of it
if (clnt->type == MEMCACHE_CLIENT) {
rawPrintStats(uri, entry, clnt->fp);
closeConnection = FALSE;
} else {
write_http_header("text/html", clnt->fp);
write_html_body(clnt->fp);
write_page_refresh(clnt->bep->settings.refreshfreq_ms, clnt->fp);
write_html_service_info(clnt, TRUE);
htmlPrintStats(uri, entry, clnt->fp);
end_html_body(clnt->fp);
}
unlock(clnt->bep);
bail:
return closeConnection;
}
// system uri for reporter interface
static int
reporterCallback(void *arg, char *uri)
{
int err = 0;
proxyclient_t *clnt = (proxyclient_t *) arg;
char *c;
char *parse;
char *parseEnd;
char *addr = NULL;
char *key = NULL;
char *portStr = NULL;
uint16_t port = 0;
parse = uri;
parseEnd = uri + strlen(uri);
// parse uri params
for (c = uri; *c != '\0'; c++) {
if (*c == '?' || *c == '&') {
*c = '\0';
}
}
for (c = parse; c < parseEnd; c++) {
if (strncmp(c, "addr=", 5) == 0) {
addr = c + 5;
} else if (strncmp(c, "port=", 5) == 0) {
portStr = c + 5;
sscanf(portStr, "%hd", &port);
} else if (strncmp(c, "key=", 4) == 0) {
key = c + 4; // XXX fix keys with spaces?
}
}
// configuration uri
if (strcmp(uri, "mcr-config") == 0) {
write_http_header("text/html", clnt->fp);
write_html_body(clnt->fp);
write_html_service_info(clnt, FALSE);
err = write_html_mcr_config(clnt, uri);
if (err) {
fprintf(clnt->fp, "Error: could not get memcache reporter "
"configuration - please check logs for "
"more information");
}
end_html_body(clnt->fp);
// top keys uri
} else if (strcmp(uri, "top-keys-gets") == 0 ||
strcmp(uri, "top-keys-sets") == 0 ||
strcmp(uri, "top-keys-all") == 0 ||
strcmp(uri, "top-keys-select") == 0) {
char *op = &uri[9];
write_http_header("text/html", clnt->fp);
write_html_body(clnt->fp);
write_page_refresh(MCRREFRESH, clnt->fp);
write_html_service_info(clnt, FALSE);
if (addr == NULL || port == 0) {
fprintf(clnt->fp, "Error: addr or port parameter not specified");
} else {
err = write_html_mcr_top_keys(clnt, addr, port, op,
TKTIME, TKNUM);
if (err) {
fprintf(clnt->fp, "Error: could not get top keys for %s:%hd"
" - please check reporting is enabled or "
" try later", addr, port);
}
}
end_html_body(clnt->fp);
// top clients uri
} else if (strcmp(uri, "top-clients-ops") == 0 ||
strcmp(uri, "top-clients-keys") == 0) {
write_http_header("text/html", clnt->fp);
write_html_body(clnt->fp);
write_page_refresh(MCRREFRESH, clnt->fp);
write_html_service_info(clnt, FALSE);
if (addr == NULL || port == 0 || key == NULL) {
fprintf(clnt->fp, "Error: addr+port+key parameters not specified");
} else {
err = write_html_mcr_top_clients(clnt, addr, port, key,
TCTIME, TCNUM);
if (err) {
fprintf(clnt->fp, "Error: could not get top clients for %s:%hd"
" - please check reporting is enabled or "
" try later", addr, port);
}
}
end_html_body(clnt->fp);
// configuration uri
} else if (strcmp(uri, "mcr-enable") == 0 ||
strcmp(uri, "mcr-disable") == 0) {
if (addr == NULL || port == 0) {
write_http_header("text/html", clnt->fp);
fprintf(clnt->fp, "Error: addr+port+key parameters not specified");
end_html_body(clnt->fp);
} else {
err = mcr_op(clnt, strcmp(uri, "mcr-enable") == 0 ? "add" : "del",
addr, port);
if (err) {
write_http_header("text/html", clnt->fp);
fprintf(clnt->fp, "System error setting reporter params -"
"please check logs for more information");
end_html_body(clnt->fp);
} else {
clntRedirect(clnt, HTTP_MOVETEMP, "/mcr-config");
}
}
} else {
clntError(clnt, HTTP_NOTFOUND, uri);
}
return TRUE;
}
// system uri for embedded image delivery
static int
imageCallback(void *arg, char *uri)
{
proxyclient_t *clnt = (proxyclient_t *) arg;
if (strcmp(uri, "logo.png") == 0) {
write_html_image(clnt->fp, sysLogo, sizeof sysLogo);
} else {
clntError(clnt, HTTP_NOTFOUND, uri);
}
return TRUE;
}
// process inbound telnet or web requests
static void *
handleFrontendRequest(void *arg)
{
proxyclient_t *clnt = (proxyclient_t *) arg;
int sock = clnt->fd;
callback_t cb;
char servRequest[MAXREQSZ];
char uri[MAXREQSZ];
char method[MAXREQSZ];
FILE *serv;
if ((serv = fdopen(sock, "a+")) == NULL) {
proxylog(LOG_ERR, "could not open file pointer to socket (%d)", sock);
close (sock);
return NULL;
}
clnt->fp = serv;
int done = FALSE;
while (!done) {
memset(servRequest, 0, MAXREQSZ);
memset(uri, 0, MAXREQSZ);
memset(method, 0, MAXREQSZ);
// pull the server request
if (fgets(servRequest, MAXREQSZ, serv) == NULL) {
goto end;
}
sscanf(servRequest, "%15s %1000s", method, uri);
if (badMethod(method) || uri == NULL) {
clntError(clnt, HTTP_BADREQUEST, uri);
goto end;
} else {
setClientType(clnt, method);
if (clnt->type == HTTP_CLIENT) {
// line buffer to make more interactive
setlinebuf(clnt->fp);
}
}
char *uriStr = uri;
if (uriStr[0] == '/') {
// strip leading /
uriStr++;
}
char *decodedUri = uri_decode(uriStr);
if (strchr(uriStr, '?') != NULL) {
// get base uri string without params
*strchr(uriStr, '?') = '\0';
}
cb = findCallback(clnt, uriStr);
if (!cb) {
free(decodedUri);
clntError(clnt, HTTP_NOTFOUND, uriStr);
goto end;
}
done = (*cb)(clnt, decodedUri);
free(decodedUri);
fflush(clnt->fp);
}
// close the socket and exit this thread
end:
fflush(serv);
fclose(serv);
free(clnt);
return NULL;
}
static void
removeOldStats(struct uri_entry *uri_entry)
{
struct stats_entry *entry;
struct stats_entry *tmp;
entry = TAILQ_FIRST(&uri_entry->stats);
while (entry != NULL) {
tmp = TAILQ_NEXT(entry, next);
free((void *) entry->name);
if (entry->type == ALPHA) {
free(entry->v.valueStr);
}
free(entry);
entry = tmp;
}
TAILQ_INIT(&uri_entry->stats);
}
// allocate a stats entry
struct stats_entry *
newStatEntry(const char *name, enum stats_type type, char *strVal, uint64_t val)
{
struct stats_entry *entry;
entry = (struct stats_entry *) calloc(1, sizeof *entry);
alloc_fail_check(entry);
entry->name = name;
entry->type = type;
switch (type) {
case ALPHA:
entry->v.valueStr = strVal; // must be allocated externally
break;
case UINT64:
entry->v.value = val;
break;
default:
assert(0);
}
return entry;
}
// add new stats to the uri
static void
addNewStats(struct uri_entry *uri_entry, struct stats_entries *new_stats)
{
struct stats_entry *entry;
while (!TAILQ_EMPTY(new_stats)) {
entry = TAILQ_FIRST(new_stats);
TAILQ_REMOVE(new_stats, entry, next);
TAILQ_INSERT_TAIL(&uri_entry->stats, entry, next);
}
}
static int
checkAndConnect(backend_t *bep)
{
int i;
int err = 0;
int retries = 5;
// try to connect
wrlock(bep);
bep->state = CONNECTING;
unlock(bep);
for (i = 0; i <= retries; i++) {
if (!sp_memcache_is_connected(bep)) {
err = sp_memcache_connect(bep);
if (err == 0) {
break;
}
sleep(CONN_RETRY_WAIT);
}
}
return err;
}
// get one stats command result, update cached values
static void
getStat(struct uri_entry *uri_entry, backend_t *bep)
{
int err = 0;
char statsCmd[CMDSZ];
snprintf(statsCmd, sizeof statsCmd, "stats %s\r\n", uri_entry->uri);
err = sp_memcache_write(bep, statsCmd);
struct stats_entries new_stats;
TAILQ_INIT(&new_stats);
if (err == 0) {
// parse command results
err = sp_memcache_read_replies(bep, &new_stats);
// update stats with new ones - (or nuke old ones on error)
wrlock(bep);
removeOldStats(uri_entry);
addNewStats(uri_entry, &new_stats);
unlock(bep);
}
}
// get health information - used for liveness checks etc
#define LIVENESS_CMD "set __LIVENESS__ 0 0 12\r\nliveness chk\r\n"
#define LIVENESS_OK "STORED\r\n"
static void
getHealth(struct uri_entry *uri_entry, backend_t *bep)
{
int done = 0;
int err = 0;
time_t now;
int64_t livenessDelta = 0;
uint64_t start;
uint64_t pollDelta = 0;
uint64_t livenessVal = 0;
char *polltimeBuf;
char healthCmd[CMDSZ];
struct stats_entry *liveness;
struct stats_entry *lastpoll;
struct stats_entry *lastpoll_int;
struct stats_entry *liveness_resp;
struct sp_memcache_socket_state session_info;
memset(&session_info, 0, sizeof session_info);
gettimeofday(&session_info.start_time, NULL);
session_info.timeout = session_info.time_remaining = bep->settings.read_ms;
// pull the last polltime
time(&now);
polltimeBuf = (char *) calloc(1, DATEBUFSZ);
alloc_fail_check(polltimeBuf);
ctime_r(&now, polltimeBuf);
polltimeBuf[strlen(polltimeBuf) - 1] = '\0'; // zap newline
if (uri_entry->lastpoll > 0) {
pollDelta = now - uri_entry->lastpoll;
} else {
pollDelta = 0;
}
// do a liveness check
snprintf(healthCmd, sizeof healthCmd, LIVENESS_CMD);
start = timestamp();
err = sp_memcache_write(bep, healthCmd);
if (err != 0) {
goto fail;
}
// expect "STORED\r\n" or "ERROR\r\n" or timeout/fail
memset(healthCmd, 0, CMDSZ);
err = sp_memcache_read(bep, healthCmd, strlen(LIVENESS_OK),
&session_info, &done);
livenessDelta = timestamp() - start;
// livenessDelta cannot be negative.
//
livenessDelta = (livenessDelta < 0) ? 0 : livenessDelta;
if (err != 0) {
goto fail;
}
if (strcmp(healthCmd, LIVENESS_OK) != 0) {
// didn't get expected answer
goto fail;
}
// things are ok - mark as such in the stats
livenessVal = 1;
fail:
liveness = newStatEntry(strdup("liveness"), UINT64, NULL, livenessVal);
liveness_resp = newStatEntry(strdup("respTimeMs"), UINT64, NULL,
livenessDelta);
lastpoll_int = newStatEntry(strdup("statsAge"), UINT64, NULL, pollDelta);
lastpoll = newStatEntry(strdup("lastpoll"), ALPHA, polltimeBuf, 0);
wrlock(bep);
removeOldStats(uri_entry);
TAILQ_INSERT_TAIL(&uri_entry->stats, lastpoll_int, next);
TAILQ_INSERT_TAIL(&uri_entry->stats, lastpoll, next);
TAILQ_INSERT_TAIL(&uri_entry->stats, liveness, next);
TAILQ_INSERT_TAIL(&uri_entry->stats, liveness_resp, next);
unlock(bep);
}
// memcache server poller
static void *
runBackend(void *arg)
{
backend_t *bep = (backend_t *) arg;
bool_t done = FALSE;
uint64_t now;
uint64_t then;
int64_t delta;
int64_t sleep_time;
wrlock(bep);
bep->state = HALTED;
unlock(bep);
restart:
while (!done) {
// poll for each of the configured uri
struct uri_entry *uri_entry;
then = timestamp();
TAILQ_FOREACH(uri_entry, &bep->uris, next) {
if (checkAndConnect(bep) != 0) {
goto restart;
}
wrlock(bep);
bep->state = POLLING;
unlock(bep);
if (strcmp(uri_entry->uri, "health") == 0) {
// synthetic "health" stats entry
getHealth(uri_entry, bep);
} else {
// request this stats uri
getStat(uri_entry, bep);
}
uri_entry->lastpoll = time(0);
}
sp_memcache_disconnect(bep);
now = timestamp();
delta = now - then;