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cpolld.c
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cpolld.c
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#include <assert.h>
#include <sys/resource.h>
#include <sys/uio.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <unistd.h>
#include <stdlib.h>
#include <err.h>
#include <string.h>
#include <stdbool.h>
#include <stdint.h>
#include <event.h>
#include <evhttp.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <pthread.h>
#include <limits.h>
#include <sysexits.h>
#include <libmemcached/memcached.h>
#include "erl_interface.h"
#include "ei.h"
#define BUFSIZE 1024
#define MAXUSERS 65536
static void settings_init(void);
struct settings {
int port;
char *inter;
int verbose;
int maxconns;
int memcached_binary;
char *memcached_pool;
} settings;
static void settings_init(void) {
settings.port = 8080;
settings.inter = "0.0.0.0";
settings.maxconns = 65536;
settings.verbose = 0;
settings.memcached_pool = "127.0.0.1:11211";
settings.memcached_binary = 1;
}
struct evhttp_request * clients[MAXUSERS+1];
int slots[MAXUSERS+1];
memcached_st *memc;
void cleanup(struct evhttp_connection *evcon, void *arg)
{
int *uidp = (int *) arg;
fprintf(stderr, "disconnected uid %d\n", *uidp);
clients[*uidp] = NULL;
}
char *fetch_memcached(const char *rkey)
{
memcached_return rc;
size_t cached_length;
uint32_t flags;
return memcached_get(memc, rkey, strlen(rkey), &cached_length, &flags, &rc);
}
void request_handler(struct evhttp_request *req, void *arg)
{
const char *uri;
uri = evhttp_request_uri(req);
if(strncmp(uri, "/updates/", 9) != 0){
evhttp_send_error(req, HTTP_NOTFOUND, "Not Found");
if (settings.verbose > 0)
fprintf(stderr, "URL not found.. needs to be /updates/... but was %s\n", uri);
return;
}
const char *rkey;
struct evkeyvalq args;
TAILQ_INIT(&args);
evhttp_parse_query(uri, &args);
rkey = evhttp_find_header(&args, "rkey");
if (NULL == rkey) {
evhttp_send_error(req, HTTP_BADREQUEST, "Bad Request");
if (settings.verbose > 0)
fprintf(stderr, "RKey param not found in request URI %s\n", uri);
evhttp_clear_headers(&args);
return;
}
fprintf(stderr, "Using RKey: %s\n", rkey);
char *cached = fetch_memcached(rkey);
if (NULL == cached) {
evhttp_send_error(req, HTTP_BADREQUEST, "Bad Request");
fprintf(stderr, "RKey %s not found in Memcache!\n", rkey);
evhttp_clear_headers(&args);
return;
}
int uid = atoi(cached);
fprintf(stderr, "Great, found RKey in Memcached: %s = %s and now UID %d\n", rkey, cached, uid);
struct evbuffer *buf = evbuffer_new();
evhttp_add_header(req->output_headers, "Content-Type", "text/html; charset=UTF-8");
evhttp_add_header(req->output_headers, "Connection", "keep-alive");
evhttp_add_header(req->output_headers, "Cache-Control", "no-cache");
evhttp_send_reply_start(req, HTTP_OK, "OK");
evbuffer_add_printf(buf, "Welcome, RKey: ‘%s’\n", rkey);
evhttp_send_reply_chunk(req, buf);
evbuffer_free(buf);
clients[uid] = req;
evhttp_clear_headers(&args);
free(cached);
evhttp_connection_set_closecb( req->evcon, cleanup, &slots[uid] );
}
void *cnode_run()
{
int fd; /* fd to Erlang node */
int got; /* Result of receive */
unsigned char buf[BUFSIZE]; /* Buffer for incoming message */
ErlMessage emsg; /* Incoming message */
ETERM *uid, *msg;
erl_init(NULL, 0);
if (erl_connect_init(1, "secretcookie", 0) == -1)
erl_err_quit("erl_connect_init");
if ((fd = erl_connect("httpdmaster@localhost")) < 0)
erl_err_quit("erl_connect");
fprintf(stderr, "Connected to httpdmaster@localhost\n\r");
struct evbuffer *evbuf;
while (1) {
got = erl_receive_msg(fd, buf, BUFSIZE, &emsg);
if (got == ERL_TICK) {
continue;
} else if (got == ERL_ERROR) {
fprintf(stderr, "ERL_ERROR from erl_receive_msg.\n");
break;
} else {
if (emsg.type == ERL_REG_SEND) {
fprintf(stderr, "type of emsg is ERL_REG_SEND\n");
// get uid and body data from eg: {123, <<"Hello">>}
uid = erl_element(1, emsg.msg);
msg = erl_element(2, emsg.msg);
char *token = (char *) ERL_BIN_PTR(uid);
char *body = (char *) ERL_BIN_PTR(msg);
int body_len = ERL_BIN_SIZE(msg);
char *cached = fetch_memcached(token);
int userid = atoi(cached);
fprintf(stderr, "memc: %d\n\r", userid);
if(clients[userid]){
fprintf(stderr, "Sending %d bytes to token %s\n", body_len, token);
evbuf = evbuffer_new();
evbuffer_add(evbuf, (const void*)body, (size_t) body_len);
evhttp_send_reply_chunk(clients[userid], evbuf);
evhttp_send_reply_end(clients[userid]);
evbuffer_free(evbuf);
}else{
fprintf(stderr, "Discarding %d bytes to uid %d - user not connected\n",
body_len, userid);
}
free(cached);
erl_free_term(emsg.msg);
erl_free_term(uid);
erl_free_term(msg);
}
}
fprintf(stderr, ".");
}
pthread_exit(0);
}
void init_memcached()
{
memcached_return rc;
memcached_server_st *server_pool;
memc = memcached_create(NULL);
assert(memc);
server_pool = memcached_servers_parse(settings.memcached_pool);
assert(server_pool);
rc = memcached_server_push(memc, server_pool);
assert(rc == MEMCACHED_SUCCESS);
rc = memcached_behavior_set(memc, MEMCACHED_BEHAVIOR_BINARY_PROTOCOL, settings.memcached_binary);
assert(rc == MEMCACHED_SUCCESS);
if (settings.verbose > 0)
fprintf(stderr, "connected to Memcached server pool: %s. Total hosts: %d. Binary setting: %d\n", settings.memcached_pool, memc->number_of_hosts, settings.memcached_binary);
memcached_server_list_free(server_pool);
}
static void usage(void) {
printf("-p <num> TCP port number to listen on (default: 11211)\n"
"-l <ip_addr> interface to listen on, default is INADDR_ANY\n"
"-m <servers> Memcached servers comma-seperated (default: 127.0.0.1:11211)\n"
"-c <num> max simultaneous connections, default is 1024\n"
"-v verbose (print errors/warnings while in event loop)\n"
);
return;
}
int main(int argc, char **argv)
{
settings_init();
struct rlimit rlim;
int c;
while (-1 != (c = getopt(argc, argv,
"c:" /* max simultaneous connections */
"p:" /* TCP port number to listen on */
"l:" /* interface to listen on, default is INADDR_ANY */
"m:" /* Memcached servers */
"v" /* verbose */
"h"
))) {
switch (c) {
case 'c':
settings.maxconns = atoi(optarg);
break;
case 'p':
settings.port = atoi(optarg);
break;
case 'l':
settings.inter = optarg;
break;
case 'm':
settings.memcached_pool = optarg;
break;
case 'h':
usage();
exit(EXIT_SUCCESS);
case 'v':
settings.verbose++;
break;
default:
fprintf(stderr, "Illegal argument \"%c\"\n", c);
return 1;
}
}
if (getrlimit(RLIMIT_NOFILE, &rlim) != 0) {
fprintf(stderr, "failed to getrlimit number of files\n");
exit(EX_OSERR);
} else {
int maxfiles = settings.maxconns;
if (rlim.rlim_cur < maxfiles)
rlim.rlim_cur = maxfiles + 3;
if (rlim.rlim_max < rlim.rlim_cur)
rlim.rlim_max = rlim.rlim_cur;
if (setrlimit(RLIMIT_NOFILE, &rlim) != 0) {
fprintf(stderr, "failed to set rlimit for open files. Try running as root or requesting smaller maxconns value.\n");
exit(EX_OSERR);
}
}
if (settings.verbose > 0)
fprintf(stderr, "maxconns set to: %d\n", settings.maxconns);
init_memcached();
pthread_attr_t tattr;
pthread_t helper;
pthread_create(&helper, NULL, cnode_run, NULL);
int i;
for(i=0;i<=MAXUSERS;i++) slots[i]=i;
struct evhttp *httpd;
event_init();
httpd = evhttp_start(settings.inter, settings.port);
if (settings.verbose > 0)
fprintf(stderr, "server listening on %s:%d\n", settings.inter, settings.port);
evhttp_set_gencb(httpd, request_handler, NULL);
event_dispatch();
evhttp_free(httpd);
memcached_free(memc);
return 0;
}